UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM N-CSR

              CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT
                              INVESTMENT COMPANIES

Investment Company Act file number 811-07642

Name of Fund: MuniAssets Fund, Inc.

Fund Address: P.O. Box 9011
              Princeton, NJ 08543-9011

Name and address of agent for service: Robert C. Doll, Jr., Chief Executive
      Officer, MuniAssets Fund, Inc., 800 Scudders Mill Road, Plainsboro, NJ
      08536. Mailing address: P.O. Box 9011, Princeton, NJ 08543-9011

Registrant's telephone number, including area code: (609) 282-2800

Date of fiscal year end: 05/31/05

Date of reporting period: 06/01/04 - 05/31/05

Item 1 - Report to Stockholders



                                   MuniAssets
                                   Fund, Inc.

Annual Report
May 31, 2005



MuniAssets Fund, Inc.

Portfolio Information as of May 31, 2005

                                                                      Percent of
Quality Ratings by                                                      Total
S&P/Moody's                                                          Investments
--------------------------------------------------------------------------------
AAA/Aaa .................................................                   0.9%
AA/Aa ...................................................                   0.2
A/A .....................................................                   3.4
BBB/Baa .................................................                  17.8
BB/Ba ...................................................                  21.5
B/B .....................................................                  12.3
CCC/Caa .................................................                   3.4
NR (Not Rated) ..........................................                  40.1
Other* ..................................................                   0.4
--------------------------------------------------------------------------------
*     Includes portfolio holdings in variable rate demand notes.

Dividend Policy

The Fund's dividend policy is to distribute all or a portion of its net
investment income to its shareholders on a monthly basis. In order to provide
shareholders with a more stable level of dividend distributions, the Fund may at
times pay out less than the entire amount of net investment income earned in any
particular month and may at times in any particular month pay out such
accumulated but undistributed income in addition to net investment income earned
in that month. As a result, the dividends paid by the Fund for any particular
month may be more or less than the amount of net investment income earned by the
Fund during such month. The Fund's current accumulated but undistributed net
investment income, if any, is disclosed in the Statement of Assets, Liabilities
and Capital, which comprises part of the financial information included in this
report.

About Inverse Floaters

As a part of its investment strategy, the Fund may invest in certain securities
whose potential income return is inversely related to changes in a floating
interest rate ("inverse floaters"). In general, income on inverse floaters will
decrease when short-term interest rates increase and increase when short-term
interest rates decrease. Investments in inverse floaters may be characterized as
derivative securities and may subject the Fund to the risks of reduced or
eliminated interest payments and losses of invested principal. In addition,
inverse floaters have the effect of providing investment leverage and, as a
result, the market value of such securities will generally be more volatile than
that of fixed rate, tax-exempt securities. To the extent the Fund invests in
inverse securities, the market value of the Fund's portfolio and the net asset
value of the Fund's shares may also be more volatile than if the Fund did not
invest in these securities. As of May 31, 2005, none of the Fund's total net
assets were invested in inverse floaters.


2               MUNIASSETS FUND, INC.           MAY 31, 2005


A Letter From the President

Dear Shareholder

After expanding at an annualized rate of 4.4% in 2004, U.S. gross domestic
product grew at an estimated 3.5% in the first quarter of 2005. The slowdown was
not entirely unexpected given last year's healthy growth and the evolution of
the economic cycle. The Federal Reserve Board -- with one eye firmly affixed on
the economic indicators and the other on inflationary measures -- has increased
the federal funds rate by 25 basis points (.25%) at each of its eight meetings
since June 2004. At period-end, the target short-term interest rate stood at 3%.

U.S. equity markets ended 2004 in a strong rally, but have struggled to record
meaningful gains in 2005. The potential for slowing economic and corporate
earnings growth, as well as volatile energy prices, have intermittently hampered
equity market progress. On the positive side, corporate transactions, such as
mergers and acquisitions, stock buy-backs and dividend payouts, have all
increased. In Asia, equities have continued to benefit from higher economic
growth prospects and valuations that appear inexpensive relative to other parts
of the world.

In the bond market, the yield curve flattening "conundrum" continued as
short-term and long-term yields moved still closer together. Over the past year,
the two-year Treasury yield increased 106 basis points while the 10-year
Treasury yield declined 66 basis points. At May 31, 2005, the two-year Treasury
note yielded 3.60% and the 10-year Treasury note yielded 4%. The falling
long-term rates may be partly attributed to foreign interest in U.S. assets and
increased issuance of short-term Treasury bonds to finance the federal deficit.
Notably, the government is considering the reissuance of the 30-year Treasury,
which was suspended in August 2001. This would allow the U.S. Treasury to adopt
a more flexible approach to borrowing, while providing investors with another
long-term fixed income option.

Amid these conditions, the major benchmarks posted six-month and 12-month
returns as follows:



Total Returns as of May 31, 2005                                        6-month        12-month
===============================================================================================
                                                                                  
U.S. equities (Standard & Poor's 500 Index)                             +2.42%          + 8.24%
-----------------------------------------------------------------------------------------------
Small-cap U.S. equities (Russell 2000 Index)                            -2.10%          + 9.82%
-----------------------------------------------------------------------------------------------
International equities (MSCI Europe Australasia Far East Index)         +1.81%          +14.62%
-----------------------------------------------------------------------------------------------
Fixed income (Lehman Brothers Aggregate Bond Index)                     +2.90%          + 6.82%
-----------------------------------------------------------------------------------------------
Tax-exempt fixed income (Lehman Brothers Municipal Bond Index)          +3.51%          + 7.96%
-----------------------------------------------------------------------------------------------
High yield bonds (Credit Suisse First Boston High Yield Index)          +0.60%          + 9.97%
-----------------------------------------------------------------------------------------------


While the environment is likely to remain somewhat challenging, we believe
opportunities exist for investors. With this in mind, we encourage you to meet
with your financial advisor to review your goals and asset allocation and to
rebalance your portfolio, as necessary, to ensure it remains aligned with your
objectives and risk tolerance. As always, we thank you for trusting Merrill
Lynch Investment Managers with your investment assets, and we look forward to
serving you in the months and years ahead.

                                      Sincerely,


                                      /s/ Robert C. Doll, Jr.

                                      Robert C. Doll, Jr.
                                      President and Director


                MUNIASSETS FUND, INC.           MAY 31, 2005                   3


A Discussion With Your Fund's Portfolio Manager

      The Fund's total return exceeded the Lipper category average by nearly 200
basis points for the fiscal year, reflecting both favorable sector allocations
and positive security selection.

Describe the recent market environment relative to municipal bonds.

Amid significant volatility, long-term bond yields moved sharply lower over the
past 12 months as short-term interest rates increased. For all of 2004, real
gross domestic product (GDP) grew at an annualized rate of 4.4%, well ahead of
2003's annual rate of 3%. The initial estimate of first quarter 2005 GDP growth
came in at 3.5%, in keeping with many economists' expectations.

It appeared that continued economic improvements were generally disregarded as
investors focused on inflationary trends, currency-related demand for long-term
U.S. securities, slowing foreign economies and interest rate action on the part
of the Federal Reserve Board (the Fed). Over the past 12 months, 30-year U.S.
Treasury bond yields declined 103 basis points (1.03%) to 4.32%, while 10-year
Treasury note yields fell 66 basis points to 4%. The Fed continued to raise
short-term interest rates at each of its meetings since June 2004, bringing the
federal funds rate to 3% by period-end. As short-term interest rates increased
while longer-term interest rates fell, the yield curve continued to flatten.

In the tax-exempt market, yields on 30-year revenue bonds, as measured by the
Bond Buyer Revenue Bond Index, fell 58 basis points during the year to 4.78%.
According to Municipal Market Data, yields on AAA-rated issues maturing in 30
years declined 73 basis points to 4.26%, while AAA-rated bonds maturing in 10
years saw their yields decline 44 basis points to 3.49%.

Over the past year, nearly $375 billion in long-term municipal securities was
underwritten, roughly in line with last year's issuance of $385 billion.
Issuance so far in 2005 has been boosted by more than a 40% increase in
refunding issues as municipalities sought to refinance existing higher-coupon
debt. These refunding issues have been heavily weighted in the 10-year - 20-year
maturity range to lower the overall interest cost of the refunding issue. This
concentration has put pressure on intermediate tax-exempt bond yields while
supporting longer-term bond prices.

Investor demand for municipal product remained generally positive during the
period. Investment Company Institute statistics indicate that, year-to-date
through April 30, 2005, net new cash flows into long-term municipal bond funds
exceeded $697 million. This represented a significant improvement from the $2.86
billion net outflow seen during the same period in 2004. Throughout much of the
past 12 months, high yield tax-exempt bond funds experienced very positive net
cash flows. During May, these lower-rated/non-rated bond funds received an
average of $175 million per week. The need to invest these ongoing cash flows
has led to strong demand for lower-rated issues and a resultant narrowing of
credit spreads.

Looking ahead, the tax-exempt market's supply/demand position remains generally
favorable. The refunding deals that inflated new-issue supply so far in 2005 are
not likely to be repeated later in the year. Municipal bond issues have
underperformed their taxable counterparts in recent months as U.S. Treasury
bonds enjoyed increased demand from foreign governments, which are unable to
benefit from the tax advantage inherent in tax-exempt products. This
underperformance, however, has resulted in very attractive tax-exempt bond yield
ratios. At 95% - 102%, tax-exempt bond yield ratios are well above recent
historic averages. We believe this should continue to attract both traditional
and nontraditional investors to the marketplace, especially if new municipal
bond issuance remains modest.

How did the Fund perform during the fiscal year in light of the existing market
conditions?

For the 12-month period ended May 31, 2005, the Common Stock of MuniAssets Fund,
Inc. had net annualized yields of 6.04% and 6.10%, based on a year-end per share
net asset value of $13.40 and a per share market price of $13.27, respectively,
and $.810 per share income dividends. Over the same period, the total investment
return on the Fund's Common Stock was +15.65%, based on a change in per share
net asset value from $12.36 to $13.40, and assuming reinvestment of all
distributions.

The Fund's total return for the year, based on net asset value, exceeded the
+13.77% average return of the Lipper High Yield Municipal Debt Funds category.
(Funds in this Lipper category invest at least 50% of their assets in
lower-rated municipal debt issues.) The outperformance is attributed to the
sector allocations that we implemented some time ago and have kept largely
intact. Specifically, the Fund's overweight exposure to corporate-related
tax-exempt debt in the transportation and health care sectors, as well as
tax-backed


4               MUNIASSETS FUND, INC.           MAY 31, 2005


and assessment-related residential and commercial real estate projects,
contributed to the strong relative performance. These sectors benefited from the
ongoing contraction of credit spreads, a trend that was particularly
advantageous in the airline and tobacco sectors, two of the market's top
performers. The narrowing of spreads has been supported by a generally improving
economy, a moderate pace of inflation and the Fed's measured approach to
interest rate increases, which generally served to sustain investors' appetites
for risk.

In terms of specific securities, we saw strong performance from capital
appreciation bonds (or zero coupon bonds) representing toll road financing for
the Pocahontas Parkway in Virginia. In conjunction with the toll road's opening
in 2002 and the subsequent increase in traffic, spreads on these bonds narrowed
significantly, making it a meaningful contributor to the Fund's performance.

For the six-month period ended May 31, 2005, the total investment return on the
Fund's Common Stock was +7.23%, based on a change in per share net asset value
from $12.90 to $13.40, and assuming reinvestment of all distributions.

For a description of the Fund's total investment return based on a change in the
per share market value of the Fund's Common Stock (as measured by the trading
price of the Fund's shares on the New York Stock Exchange), and assuming
reinvestment of dividends, please refer to the Financial Highlights section of
this report. As a closed-end fund, the Fund's shares may trade in the secondary
market at a premium or discount to the Fund's net asset value. As a result,
total investment returns based on changes in the market value of the Fund's
Common Stock can vary significantly from total investment returns based on
changes in the Fund's net asset value.

What changes were made to the portfolio during the year?

We continued to trim our exposure to corporate-related sectors through tactical
sales as the market provided opportunities. Because the corporate sector tends
to be the most volatile in the municipal market, our goal was to realize profits
while also preparing the Fund for an eventual turn in the credit cycle (i.e.,
widening credit spreads). Offsetting these sales, we increased the Fund's
position in the tax-backed sector, specifically commercial and residential real
estate, as well as long-term care, a subsector of health care. Long-term care
focuses on the construction of retirement facilities that provide a range of
continuing care options, including independent living arrangements, assisted
living and skilled nursing facilities.

Reflecting our move out of corporate bonds and into the other two sectors, many
of the holdings sold have been in the B, BB and BBB rating categories. In turn,
the bonds we purchased tended to be non-rated. While ostensibly this may appear
to indicate a reduction in the portfolio's average credit quality, we actually
view many of the non-rated issues we added as more solid credits than some of
the corporate bonds we sold. They tend to exhibit lower volatility and, in some
cases, higher degrees of liquidity. As mentioned in our previous report to
shareholders, another reason for initiating this trade is our desire to achieve
more market-neutral weightings in each of these categories. We have been
overweight in the B-BBB range for some time, and underweight in non-rated
issues. By reallocating assets to lower-rated issues, we have effectively been
able to boost portfolio income and increase the Fund's dividend reserves.

Finally, we maintained our exposure to debt issued by the State of California,
which has continued to benefit Fund performance as spreads tightened. We believe
additional upside could exist in the California market, particularly if the
state pursues refinancing opportunities in the current low interest rate
environment.

How would you characterize the Fund's position at the close of the period?

We continue to focus on capturing relative value within the high yield municipal
arena as a means of enhancing the Fund's returns over time. At period-end, the
Fund remained overweight in the B to BBB range, although less so than at the
beginning of the period. We expect to continue our strategy of trimming our
exposure in this area. We have made strides in terms of diversifying the
portfolio during the past year, and we look forward to discussing further
progress in our next report to shareholders.

Theodore R. Jaeckel Jr., CFA
Vice President and Portfolio Manager

June 9, 2005


                MUNIASSETS FUND, INC.           MAY 31, 2005                   5


Schedule of Investments                                           (in Thousands)



                         Face
State                    Amount    Municipal Bonds                                                                           Value
====================================================================================================================================
                                                                                                                   
Alabama--0.9%            $ 2,420   Brewton, Alabama, IDB, PCR, Refunding (Container Corporation of America--Jefferson
                                   Smurfit Corp. Project), 8% due 4/01/2009                                                 $  2,478
====================================================================================================================================
Alaska--0.5%               1,290   Alaska Industrial Development and Export Authority Revenue Bonds (Williams Lynxs Alaska
                                   Cargoport), AMT, 7.80% due 5/01/2014                                                        1,361
====================================================================================================================================
Arizona--7.3%                      Coconino County, Arizona, Pollution Control Corporation, Revenue Refunding Bonds
                                   (Tucson Electric Power--Navajo):
                           3,000         AMT, Series A, 7.125% due 10/01/2032                                                  3,171
                           2,500         Series B, 7% due 10/01/2032                                                           2,610
                           1,425   Maricopa County, Arizona, IDA, Education Revenue Bonds (Arizona Charter Schools Project
                                   1), Series A, 6.625% due 7/01/2020                                                          1,419
                                   Maricopa County, Arizona, IDA, M/F Housing Revenue Bonds (Sun King Apartments Project):
                           1,540         Series A, 6.75% due 5/01/2031                                                         1,257
                           2,345         Sub-Series C, 9.50% due 11/01/2031                                                    1,809
                           7,600   Phoenix, Arizona, IDA, Airport Facility Revenue Refunding Bonds (America West Airlines
                                   Inc. Project), AMT, 6.30% due 4/01/2023                                                     5,601
                                   Pima County, Arizona, IDA, Education Revenue Bonds:
                           1,420         (Arizona Charter Schools Project), Series E, 7.25% due 7/01/2031                      1,535
                           1,000         (Arizona Charter Schools Project II), Series A, 6.75% due 7/01/2031                   1,046
                           1,320   Show Low, Arizona, Improvement District No. 5, Special Assessment Bonds,
                                   6.375% due 1/01/2015                                                                        1,381
====================================================================================================================================
California--2.8%                   California State, Various Purpose, GO:
                           1,900         5.25% due 11/01/2025                                                                  2,073
                           1,300         5.50% due 11/01/2033                                                                  1,445
                           1,320   Fontana, California, Special Tax, Refunding (Community Facilities District No. 22--
                                   Sierra), 6% due 9/01/2034                                                                   1,363
                           2,620   Golden State Tobacco Securitization Corporation of California, Tobacco Settlement
                                   Revenue Bonds, Series B, 5.50% due 6/01/2043                                                2,809
====================================================================================================================================
Colorado--7.2%             2,000   Denver, Colorado, City and County Airport Revenue Bonds, AMT, Series D,
                                   7.75% due 11/15/2013 (a)                                                                    2,402
                                   Denver, Colorado, Urban Renewal Authority, Tax Increment Revenue Bonds (Pavilions),
                                   AMT:
                           2,450         7.75% due 9/01/2016                                                                   2,589
                           3,000         7.75% due 9/01/2017                                                                   3,165
                                   Elk Valley, Colorado, Public Improvement Revenue Bonds (Public Improvement Fee):
                           1,890         Series A, 7.10% due 9/01/2014                                                         2,047
                           2,095         Series A, 7.30% due 9/01/2022                                                         2,262
                           1,000         Series B, 7% due 9/01/2031                                                            1,033
                           1,760   North Range, Colorado, Metropolitan District No. 1, GO, 7.25% due 12/15/2031                1,783
                           2,850   Plaza Metropolitan District No. 1, Colorado, Tax Allocation Revenue Bonds (Public
                                   Improvement Fees), 8% due 12/01/2025                                                        3,172
                           1,170   Southlands, Colorado, Medical District, GO (Metropolitan District No. 1),
                                   7.125% due 12/01/2034                                                                       1,288
====================================================================================================================================
Connecticut--3.4%          2,350   Bridgeport, Connecticut, Senior Living Facilities Revenue Bonds (3030 Park Retirement
                                   Community Project), 7.25% due 4/01/2035                                                     2,441
                             680   Connecticut State Development Authority, Airport Facility Revenue Bonds (LearJet Inc.
                                   Project), AMT, 7.95% due 4/01/2026                                                            809
                           3,490   Connecticut State Development Authority, IDR (AFCO Cargo BDL-LLC Project), AMT,
                                   8% due 4/01/2030                                                                            3,714
                           2,330   New Haven, Connecticut, Facility Revenue Bonds (Hill Health Corporation Project),
                                   9.25% due 5/01/2017                                                                         2,338


Portfolio Abbreviations

To simplify the listings of MuniAssets Fund, Inc.'s portfolio holdings in the
Schedule of Investments, we have abbreviated the names of many of the securities
according to the list at right.

AMT        Alternative Minimum Tax (subject to)
EDA        Economic Development Authority
GO         General Obligation Bonds
IDA        Industrial Development Authority
IDB        Industrial Development Board
IDR        Industrial Development Revenue Bonds
M/F        Multi-Family
PCR        Pollution Control Revenue Bonds
VRDN       Variable Rate Demand Notes


6               MUNIASSETS FUND, INC.           MAY 31, 2005


Schedule of Investments (continued)                               (in Thousands)



                         Face
State                    Amount    Municipal Bonds                                                                           Value
====================================================================================================================================
                                                                                                                   
Florida--5.1%            $   740   Arbor Greene Community Development District, Florida, Special Assessment Revenue Bonds,
                                   7.60% due 5/01/2018                                                                      $    778
                           1,130   Capital Projects Finance Authority, Florida, Continuing Care Retirement Revenue Bonds
                                   (Glenridge on Palmer Ranch), Series A, 8% due 6/01/2032                                     1,237
                             495   Harbor Bay, Florida, Community Development District, Capital Improvement Special
                                   Assessment Revenue Bonds, Series A, 7% due 5/01/2033                                          533
                           2,000   Hillsborough County, Florida, IDA, Exempt Facilities Revenue Bonds (National Gypsum
                                   Company), AMT, Series A, 7.125% due 4/01/2030                                               2,250
                           3,255   Midtown Miami, Florida, Community Development District, Special Assessment Revenue
                                   Bonds, Series A, 6.25% due 5/01/2037                                                        3,444
                           2,305   Orlando, Florida, Urban Community Development District, Capital Improvement Special
                                   Assessment Bonds, Series A, 6.95% due 5/01/2033                                             2,488
                           2,400   Santa Rosa Bay Bridge Authority, Florida, Revenue Bonds, 6.25% due 7/01/2028                2,303
                             935   Waterchase, Florida, Community Development District, Capital Improvement Revenue Bonds,
                                   Series A, 6.70% due 5/01/2032                                                               1,000
====================================================================================================================================
Georgia--3.5%              3,000   Atlanta, Georgia, Tax Allocation Bonds (Atlantic Station Project), 7.90% due 12/01/2024     3,287
                                   Brunswick & Glynn County, Georgia, Development Authority, First Mortgage Revenue Bonds
                                   (Coastal Community Retirement Corporation Project), Series A:
                           1,165         7.125% due 1/01/2025                                                                  1,229
                           1,690         7.25% due 1/01/2035                                                                   1,788
                           2,000   Milledgeville-Baldwin County, Georgia, Development Authority Revenue Bonds (Georgia
                                   College and State University Foundation), 5.625% due 9/01/2030                              2,123
                           1,170   Savannah, Georgia, EDA, Revenue Bonds (Marshes of Skidaway), First Mortgage, Series A,
                                   7.40% due 1/01/2034                                                                         1,225
====================================================================================================================================
Idaho--0.4%                1,000   Idaho Health Facilities Authority, Revenue Refunding Bonds (Valley Vista Care
                                   Corporation), Series A, 7.75% due 11/15/2016                                                1,019
====================================================================================================================================
Illinois--4.7%             2,630   Caseyville, Illinois, Senior Tax Increment Revenue Bonds (Forest Lakes Project),
                                   7% due 12/30/2022                                                                           2,653
                           4,000   Chicago, Illinois, O'Hare International Airport, Special Facility Revenue Refunding
                                   Bonds (American Airlines Inc. Project), 8.20% due 12/01/2024                                3,710
                             600   Chicago, Illinois, Special Assessment Bonds (Lake Shore East), 6.75% due 12/01/2032           625
                                   Illinois Development Finance Authority Revenue Bonds (Primary Health Care Centers
                                   Facilities Acquisition Program):
                             560         7.50% due 12/01/2006                                                                    574
                             115         7.50% due 12/01/2006 (e)                                                                120
                             475         7.75% due 12/01/2006 (d)                                                                515
                           2,720         7.75% due 12/01/2016                                                                  2,854
                             685   Illinois State Finance Authority Revenue Bonds (Primary Health Care Centers Program),
                                   6.60% due 7/01/2024                                                                           698
                           1,070   Lincolnshire, Illinois, Special Service Area No. 1, Special Tax Bonds (Sedgebrook
                                   Project), 6.25% due 3/01/2034                                                               1,139
====================================================================================================================================
Iowa--1.0%                 2,250   Iowa Finance Authority, Health Care Facilities Revenue Refunding Bonds (Care
                                   Initiatives Project), 9.25% due 7/01/2025                                                   2,751
====================================================================================================================================
Kentucky--0.9%             2,850   Kenton County, Kentucky, Airport Board, Special Facilities Revenue Bonds (Mesaba
                                   Aviation Inc. Project), AMT, Series A, 6.70% due 7/01/2029                                  2,350
====================================================================================================================================
Louisiana--2.8%            7,500   Port New Orleans, Louisiana, IDR, Refunding (Continental Grain Company Project),
                                   7.50% due 7/01/2013                                                                         7,754
====================================================================================================================================
Maine--0.4%                1,160   Maine Finance Authority, Solid Waste Recycling Facilities Revenue Bonds (Great Northern
                                   Paper Project--Bowater), AMT, 7.75% due 10/01/2022                                          1,166
====================================================================================================================================
Maryland--1.7%             1,910   Maryland State Economic Development Corporation, Revenue Refunding Bonds (Baltimore
                                   Association for Retarded Citizens--Health and Mental Hygiene Program), Series A,
                                   7.75% due 3/01/2025                                                                         2,041
                           2,500   Maryland State Energy Financing Administration, Limited Obligation Revenue Bonds
                                   (Cogeneration--AES Warrior Run), AMT, 7.40% due 9/01/2019                                   2,554



                MUNIASSETS FUND, INC.           MAY 31, 2005                   7


Schedule of Investments (continued)                               (in Thousands)



                         Face
State                    Amount    Municipal Bonds                                                                           Value
====================================================================================================================================
                                                                                                                   
Massachusetts--1.8%      $ 1,680   Massachusetts State Development Finance Agency, Revenue Refunding Bonds (Eastern
                                   Nazarene College), 5.625% due 4/01/2029                                                  $  1,686
                           1,150   Massachusetts State Health and Educational Facilities Authority Revenue Bonds (Jordan
                                   Hospital), Series E, 6.75% due 10/01/2033                                                   1,273
                           2,045   Massachusetts State Health and Educational Facilities Authority, Revenue Refunding
                                   Bonds (Bay Cove Human Services Issue), Series A, 5.90% due 4/01/2028                        2,027
====================================================================================================================================
Michigan--0.8%               400   Eastern Michigan University Revenue Refunding Bonds, VRDN, 2.96% due 6/01/2027 (b)(f)         400
                           1,635   Macomb County, Michigan, Hospital Finance Authority, Hospital Revenue Bonds (Mount
                                   Clemens General Hospital), Series B, 5.875% due 11/15/2034                                  1,650
====================================================================================================================================
Minnesota--1.3%            1,180   Minneapolis & Saint Paul, Minnesota, Metropolitan Airports Commission, Special
                                   Facilities Revenue Refunding Bonds (Northwest Airlines Inc. Project), AMT, 7.375%
                                   due 4/01/2025                                                                               1,151
                           1,770   Saint Paul, Minnesota, Port Authority, Hotel Facility Revenue Refunding Bonds (Radisson
                                   Kellogg Project), Series 2, 7.375% due 8/01/2029                                            1,858
                             440   Virginia, Minnesota, Housing and Redevelopment Authority, Health Care Facility Lease
                                   Revenue Bonds, 5.25% due 10/01/2025                                                           462
====================================================================================================================================
Missouri--0.9%                     Fenton, Missouri, Tax Increment Revenue Refunding and Improvement Bonds (Gravois Bluffs):
                             235         6.75% due 10/01/2015                                                                    237
                           1,000         7% due 10/01/2021                                                                     1,082
                           1,000   Kansas City, Missouri, IDA, First Mortgage Health Facilities Revenue Bonds (Bishop
                                   Spencer Place), Series A, 6.50% due 1/01/2035                                               1,024
====================================================================================================================================
Nevada--0.3%                 650   Clark County, Nevada, Improvement District No. 142 Special Assessment,
                                   6.375% due 8/01/2023                                                                          671
====================================================================================================================================
New Jersey--16.4%                  Camden County, New Jersey, Improvement Authority, Lease Revenue Bonds (Holt Hauling &
                                   Warehousing), AMT, Series A (g)(h):
                           5,600         9.625% due 1/01/2011                                                                    713
                           5,800         9.875% due 1/01/2021                                                                    738
                             770   Camden County, New Jersey, Pollution Control Financing Authority, Solid Waste Resource
                                   Recovery Revenue Bonds, Series D, 7.25% due 12/01/2010                                        770
                                   Camden County, New Jersey, Pollution Control Financing Authority, Solid Waste Resource
                                   Recovery Revenue Refunding Bonds, AMT:
                           9,000         Series A, 7.50% due 12/01/2010                                                        8,999
                             985         Series B, 7.50% due 12/01/2009                                                          985
                           3,065   New Jersey EDA, Cigarette Tax Revenue Bonds, 5.50% due 6/15/2024                            3,258
                           2,500   New Jersey EDA, IDR, Refunding (Newark Airport Marriott Hotel), 7% due 10/01/2014           2,605
                                   New Jersey EDA, Retirement Community Revenue Bonds:
                           1,665         (Cedar Crest Village Inc. Facility), Series A, 7.25% due 11/15/2021                   1,802
                           5,800         (Seabrook Village Inc.), Series A, 8.125% due 11/15/2023                              6,560
                                   New Jersey EDA, Special Facility Revenue Bonds (Continental Airlines Inc. Project), AMT:
                           2,000         6.25% due 9/15/2019                                                                   1,757
                           6,195         6.25% due 9/15/2029                                                                   5,222
                           1,250         9% due 6/01/2033                                                                      1,322
                           2,650   New Jersey Health Care Facilities Financing Authority Revenue Bonds (Pascack Valley
                                   Hospital Association), 6.625% due 7/01/2036                                                 2,647
                           1,500   New Jersey Health Care Facilities Financing Authority, Revenue Refunding Bonds
                                   (Trinitas Hospital Obligation Group), 7.40% due 7/01/2020                                   1,716
                           4,115   Tobacco Settlement Financing Corporation of New Jersey, Asset-Backed Revenue Bonds,
                                   5.75% due 6/01/2032                                                                         4,162
                           1,425   Tobacco Settlement Financing Corporation of New Jersey Revenue Bonds, 7% due 6/01/2041      1,578
====================================================================================================================================
New Mexico--1.0%           2,500   Farmington, New Mexico, PCR, Refunding (Tucson Electric Power Co.--San Juan Project),
                                   Series A, 6.95% due 10/01/2020                                                              2,622
====================================================================================================================================
New York--3.3%             1,400   Dutchess County, New York, IDA, Civic Facility Revenue Refunding Bonds (Saint Francis
                                   Hospital), Series A, 7.50% due 3/01/2029                                                    1,465
                                   New York City, New York, City IDA, Civic Facility Revenue Bonds:
                             510         Series C, 6.80% due 6/01/2028                                                           543
                           2,715         (Special Needs Facilities Pooled Program), Series C-1, 6.625% due 7/01/2029           2,607
                           2,400   New York City, New York, City IDA, Special Facility Revenue Bonds (British Airways Plc
                                   Project), AMT, 7.625% due 12/01/2032                                                        2,677
                           1,575   Westchester County, New York, IDA, Continuing Care Retirement, Mortgage Revenue Bonds
                                   (Kendal on Hudson Project), Series A, 6.50% due 1/01/2034                                   1,661



8               MUNIASSETS FUND, INC.           MAY 31, 2005


Schedule of Investments (continued)     (in Thousands)



                         Face
State                    Amount    Municipal Bonds                                                                           Value
====================================================================================================================================
                                                                                                                   
North Carolina--0.6%     $ 1,500   North Carolina Medical Care Commission, Retirement Facilities, First Mortgage Revenue
                                   Bonds (Givens Estates Project), Series A, 6.50% due 7/01/2032                            $  1,618
====================================================================================================================================
Oregon--0.8%                       Western Generation Agency, Oregon, Cogeneration Project Revenue Bonds (Wauna
                                   Cogeneration Project):
                           1,440         AMT, Series B, 7.40% due 1/01/2016                                                    1,476
                             700         Series A, 7.125% due 1/01/2021                                                          718
====================================================================================================================================
Pennsylvania--5.4%         2,330   Montgomery County, Pennsylvania, IDA Revenue Bonds (Whitemarsh Continuing Care
                                   Project), 6.125% due 2/01/2028                                                              2,408
                           3,250   Pennsylvania Economic Development Financing Authority, Exempt Facilities Revenue Bonds
                                   (National Gypsum Company), AMT, Series A, 6.25% due 11/01/2027                              3,501
                           2,270   Philadelphia, Pennsylvania, Authority for IDR (Air Cargo), AMT, Series A,
                                   7.50% due 1/01/2025                                                                         2,366
                           6,440   Philadelphia, Pennsylvania, Authority for IDR, Commercial Development,
                                   7.75% due 12/01/2017                                                                        6,581
====================================================================================================================================
South Carolina--1.4%       3,500   South Carolina Jobs, EDA, Economic Development Revenue Bonds (Westminster Presbyterian
                                   Center), 7.75% due 11/15/2030                                                               3,743
====================================================================================================================================
Tennessee--0.9%            2,500   Shelby County, Tennessee, Health, Educational and Housing Facilities Board Revenue
                                   Bonds (Germantown Village), Series A, 7.25% due 12/01/2034                                  2,604
====================================================================================================================================
Texas--8.4%                1,000   Austin, Texas, Convention Center Revenue Bonds (Convention Enterprises Inc.), First
                                   Tier, Series A, 6.70% due 1/01/2028                                                         1,072
                             700   Bell County, Texas, Health Facilities Development Corporation, Hospital Revenue Bonds
                                   (Scott & White Memorial Hospital), VRDN, Series 2001-2, 2.95% due 8/15/2031 (c)(f)            700
                                   Brazos River Authority, Texas, PCR, Refunding, AMT:
                           2,550         (Texas Utility Company), Series A, 7.70% due 4/01/2033                                3,028
                           3,865         (Utilities Electric Company), Series B, 5.05% due 6/01/2030                           3,932
                           1,680   Brazos River Authority, Texas, Revenue Refunding Bonds (Reliant Energy Inc. Project),
                                   Series B, 7.75% due 12/01/2018                                                              1,866
                           2,340   Grand Prairie, Texas, Housing Finance Corporation Revenue Bonds (Independent Senior
                                   Living Center), 7.75% due 1/01/2034                                                         2,305
                           1,400   Houston, Texas, Health Facilities Development Corporation, Retirement Facility Revenue
                                   Bonds (Buckingham Senior Living Community), Series A, 7.125% due 2/15/2034                  1,510
                           3,190   Matagorda County, Texas, Navigation District No. 1 Revenue Refunding Bonds (Reliant
                                   Energy Inc.), Series C, 8% due 5/01/2029                                                    3,516
                           1,860   Port Corpus Christi, Texas, Individual Development Corporation, Environmental
                                   Facilities Revenue Bonds (Citgo Petroleum Corporation Project), AMT, 8.25%
                                   due 11/01/2031                                                                              1,995
                           3,000   Port Corpus Christi, Texas, Revenue Refunding Bonds (Celanese Project), AMT, Series B,
                                   6.70% due 11/01/2030                                                                        3,162
====================================================================================================================================
Utah--0.6%                 1,660   Carbon County, Utah, Solid Waste Disposal Revenue Refunding Bonds (Laidlaw
                                   Environmental), AMT, Series A, 7.45% due 7/01/2017                                          1,711
====================================================================================================================================
Virginia--8.4%             1,500   Dulles Town Center, Virginia, Community Development Authority, Special Assessment Tax
                                   (Dulles Town Center Project), 6.25% due 3/01/2026                                           1,549
                                   Pocahontas Parkway Association, Virginia, Toll Road Revenue Bonds, Capital Appreciation,
                                   Senior Series B:
                          48,400         5.95%* due 8/15/2031                                                                 10,177
                          48,400         5.95%* due 8/15/2032                                                                  9,538
                           1,590   Tobacco Settlement Financing Corporation of Virginia, Asset-Backed Revenue Bonds,
                                   5.625% due 6/01/2037                                                                        1,584
====================================================================================================================================
West Virginia--0.4%        1,320   Princeton, West Virginia, Hospital Revenue Refunding Bonds (Community Hospital
                                   Association Inc. Project), 6% due 5/01/2019                                                 1,187
====================================================================================================================================
Wisconsin--0.7%            1,855   Wisconsin State Health and Educational Facilities Authority Revenue Bonds (New Castle
                                   Place Project), Series A, 7% due 12/01/2031                                                 1,899
====================================================================================================================================
Wyoming--0.9%              2,500   Sweetwater County, Wyoming, Solid Waste Disposal Revenue Bonds (FMC Corporation
                                   Project), AMT, Series A, 7% due 6/01/2024                                                   2,527



                MUNIASSETS FUND, INC.           MAY 31, 2005                   9


Schedule of Investments (concluded)                               (in Thousands)



                         Face
                         Amount    Municipal Bonds                                                                           Value
====================================================================================================================================
                                                                                                                   
U.S. Virgin              $ 3,000   Virgin Islands Government Refinery Facilities, Revenue Refunding Bonds (Hovensa Coker
Islands--1.2%                      Project), AMT, 6.50% due 7/01/2021                                                       $  3,412
====================================================================================================================================
Total Investments (Cost--$266,013**)--98.1%                                                                                  268,224

Other Assets Less Liabilities--1.9%                                                                                            5,158
                                                                                                                            --------
Net Assets--100.0%                                                                                                          $273,382
                                                                                                                            ========


*     Represents a zero coupon bond; the interest rate shown reflects the
      effective yield at the time of purchase by the Fund.
**    The cost and unrealized appreciation (depreciation) of investments as of
      May 31, 2005, as computed for federal income tax purposes, were as
      follows:

                                                                  (in Thousands)
      --------------------------------------------------------------------------
      Aggregate cost ..............................................    $265,729
                                                                       ========
      Gross unrealized appreciation ...............................    $ 16,828
      Gross unrealized depreciation ...............................     (14,333)
                                                                       --------
      Net unrealized appreciation .................................    $  2,495
                                                                       ========

(a)   AMBAC Insured.
(b)   FGIC Insured.
(c)   MBIA Insured.
(d)   Prerefunded.
(e)   Escrowed to maturity.
(f)   Security may have a maturity of more than one year at time of issuance,
      but has variable rate and demand features that qualify it as a short-term
      security. The rate disclosed is that currently in effect. This rate
      changes periodically based upon prevailing market rates.
(g)   Restricted securities as to resale, representing 0.5% of net assets, were
      as follows:

                                                                  (in Thousands)
      --------------------------------------------------------------------------
                                            Acquisition
      Issue                                    Date(s)           Cost      Value
      --------------------------------------------------------------------------
      Camden County, New Jersey,
       Improvement Authority, Lease
       Revenue Bonds (Holt Hauling &
       Warehousing), AMT, Series A,
       9.625% due 1/01/2011                   1/29/1997        $ 5,925    $  713

      Camden County, New Jersey,
       Improvement Authority, Lease
       Revenue Bonds (Holt Hauling &
       Warehousing), AMT, Series A,          2/06/1996-
       9.875% due 1/01/2021                   1/29/1997          5,944       738
      --------------------------------------------------------------------------
      Total                                                    $11,869    $1,451
                                                               =================

(h)   Non-income producing security; issuer filed for bankruptcy or is in
      default of interest payments.

      See Notes to Financial Statements.


10              MUNIASSETS FUND, INC.           MAY 31, 2005


Statement of Assets, Liabilities and Capital


As of May 31, 2005
========================================================================================================================
Assets
------------------------------------------------------------------------------------------------------------------------
                                                                                                     
                       Investments in unaffiliated securities, at value
                        (identified cost--$266,013,344) .............................                      $ 268,224,409
                       Cash .........................................................                             13,201
                       Receivables:
                          Interest ..................................................    $   5,070,505
                          Securities sold ...........................................          165,000         5,235,505
                                                                                         -------------
                       Prepaid expenses and other assets ............................                            254,723
                                                                                                           -------------
                       Total assets .................................................                        273,727,838
                                                                                                           -------------
========================================================================================================================
Liabilities
------------------------------------------------------------------------------------------------------------------------
                       Payables:
                          Dividends to shareholders .................................          204,705
                          Investment adviser ........................................           94,290
                          Other affiliates ..........................................            2,340           301,335
                                                                                         -------------
                       Accrued expenses .............................................                             44,650
                                                                                                           -------------
                       Total liabilities ............................................                            345,985
                                                                                                           -------------
========================================================================================================================
Net Assets
------------------------------------------------------------------------------------------------------------------------
                       Net Assets ...................................................                      $ 273,381,853
                                                                                                           =============
========================================================================================================================
Capital
------------------------------------------------------------------------------------------------------------------------
                       Common Stock, par value $.10 per share; 200,000,000 shares
                        authorized; 20,399,713 shares issued and outstanding ........                      $   2,039,971
                       Paid-in capital in excess of par .............................                        297,146,644
                       Undistributed investment income--net .........................    $   3,524,872
                       Accumulated realized capital losses--net .....................      (31,540,699)
                       Unrealized appreciation--net .................................        2,211,065
                                                                                         -------------
                       Total accumulated losses--net ................................                        (25,804,762)
                                                                                                           -------------
                       Total capital--Equivalent to $13.40 net asset value per
                        share of Common Stock (market price--$13.27) ................                      $ 273,381,853
                                                                                                           =============


      See Notes to Financial Statements.


                MUNIASSETS FUND, INC.           MAY 31, 2005                  11


Statement of Operations


For the Year Ended May 31, 2005
========================================================================================================================
Investment Income
------------------------------------------------------------------------------------------------------------------------
                                                                                                     
                       Interest .....................................................                      $  18,361,106
========================================================================================================================
Expenses
------------------------------------------------------------------------------------------------------------------------
                       Investment advisory fees .....................................    $   1,447,637
                       Accounting services ..........................................           93,581
                       Transfer agent fees ..........................................           50,687
                       Professional fees ............................................           47,937
                       Printing and shareholder reports .............................           46,384
                       Listing fees .................................................           19,117
                       Directors' fees and expenses .................................           18,549
                       Pricing fees .................................................           15,865
                       Custodian fees ...............................................           15,562
                       Other ........................................................           19,975
                                                                                         -------------
                       Total expenses ...............................................                          1,775,294
                                                                                                           -------------
                       Investment income--net .......................................                         16,585,812
                                                                                                           -------------
========================================================================================================================
Realized & Unrealized Gain (Loss)--Net
------------------------------------------------------------------------------------------------------------------------
                       Realized loss on investments--net ............................                            (37,012)
                       Change in unrealized appreciation/depreciation on
                        investments--net ............................................                         21,092,669
                                                                                                           -------------
                       Total realized and unrealized gain--net ......................                         21,055,657
                                                                                                           -------------
                       Net Increase in Net Assets Resulting from Operations .........                      $  37,641,469
                                                                                                           =============


      See Notes to Financial Statements.


12              MUNIASSETS FUND, INC.           MAY 31, 2005


Statements of Changes in Net Assets



                                                                                                For the Year Ended
                                                                                                      May 31,
                                                                                         -------------------------------
Increase (Decrease) in Net Assets:                                                            2005              2004
========================================================================================================================
Operations
------------------------------------------------------------------------------------------------------------------------
                                                                                                     
                       Investment income--net .......................................    $  16,585,812     $  16,864,937
                       Realized loss--net ...........................................          (37,012)       (5,384,520)
                       Change in unrealized appreciation/depreciation--net ..........       21,092,669        13,149,431
                                                                                         -------------------------------
                       Net increase in net assets resulting from operations .........       37,641,469        24,629,848
                                                                                         -------------------------------
========================================================================================================================
Dividends & Distributions to Shareholders
------------------------------------------------------------------------------------------------------------------------
                       Investment income--net .......................................      (16,462,568)      (15,993,376)
                       Realized gain--net ...........................................               --          (104,855)
                                                                                         -------------------------------
                       Net decrease in net assets resulting from dividends and
                        distributions to Common Stock shareholders ..................      (16,462,568)      (16,098,231)
                                                                                         -------------------------------
========================================================================================================================
Net Assets
------------------------------------------------------------------------------------------------------------------------
                       Total increase in net assets .................................       21,178,901         8,531,617
                       Beginning of year ............................................      252,202,952       243,671,335
                                                                                         -------------------------------
                       End of year* .................................................    $ 273,381,853     $ 252,202,952
                                                                                         ===============================
                          * Undistributed investment income--net ....................    $   3,524,872     $   3,401,628
                                                                                         ===============================


      See Notes to Financial Statements.


                MUNIASSETS FUND, INC.           MAY 31, 2005                  13


Financial Highlights



                                                                                       For the Year Ended May 31,
The following per share data and ratios have been derived      --------------------------------------------------------------------
from information provided in the financial statements.           2005           2004           2003           2002           2001
===================================================================================================================================
Per Share Operating Performance
-----------------------------------------------------------------------------------------------------------------------------------
                                                                                                                 
                 Net asset value, beginning of year ........   $  12.36       $  11.94       $  12.55       $  12.96       $  12.76
                                                               --------------------------------------------------------------------
                 Investment income--net ....................        .81+           .83+           .81+           .79            .83
                 Realized and unrealized gain (loss)--net ..       1.04            .38           (.64)          (.41)           .19
                                                               --------------------------------------------------------------------
                 Total from investment operations ..........       1.85           1.21            .17            .38           1.02
                                                               --------------------------------------------------------------------
                 Less dividends and distributions:
                    Investment income--net .................       (.81)          (.78)          (.78)          (.79)          (.82)
                    Realized gain--net .....................         --           (.01)            --             --             --
                                                               --------------------------------------------------------------------
                 Total dividends and distributions .........       (.81)          (.79)          (.78)          (.79)          (.82)
                                                               --------------------------------------------------------------------
                 Net asset value, end of year ..............   $  13.40       $  12.36       $  11.94       $  12.55       $  12.96
                                                               ====================================================================
                 Market price per share, end of year .......   $  13.27       $  11.38       $  11.91       $  11.66       $  13.00
                                                               ====================================================================
===================================================================================================================================
Total Investment Return*
-----------------------------------------------------------------------------------------------------------------------------------
                 Based on net asset value per share ........      15.65%         10.74%          1.61%          3.30%          8.58%
                                                               ====================================================================
                 Based on market price per share ...........      24.39%          2.22%          9.09%         (4.32%)        24.22%
                                                               ====================================================================
===================================================================================================================================
Ratios to Average Net Assets
-----------------------------------------------------------------------------------------------------------------------------------
                 Expenses, excluding reorganization expenses        .67%           .67%           .78%           .74%           .76%
                                                               ====================================================================
                 Expenses ..................................        .67%           .67%           .78%           .83%           .76%
                                                               ====================================================================
                 Investment income--net ....................       6.30%          6.71%          6.76%          6.16%          6.44%
                                                               ====================================================================
===================================================================================================================================
Supplemental Data
-----------------------------------------------------------------------------------------------------------------------------------
                 Net assets, end of year (in thousands) ....   $273,382       $252,203       $243,671       $255,150       $135,448
                                                               ====================================================================
                 Portfolio turnover ........................      19.67%         19.14%         26.98%         20.07%         17.11%
                                                               ====================================================================


*     Total investment returns based on market value, which can be significantly
      greater or lesser than the net asset value, may result in substantially
      different returns. Total investment returns exclude the effects of sales
      charges.
+     Based on average shares outstanding.

      See Notes to Financial Statements.


14              MUNIASSETS FUND, INC.           MAY 31, 2005


Notes to Financial Statements

1. Significant Accounting Policies:

MuniAssets Fund, Inc. (the "Fund") is registered under the Investment Company
Act of 1940, as amended, as a non-diversified, closed-end management investment
company. The Fund's financial statements are prepared in conformity with U.S.
generally accepted accounting principles, which may require the use of
management accruals and estimates. Actual results may differ from these
estimates. The Fund determines and makes available for publication the net asset
value of its Common Stock on a daily basis. The Fund's Common Stock shares are
listed on the New York Stock Exchange under the symbol MUA. The following is a
summary of significant accounting policies followed by the Fund.

(a) Valuation of investments -- Municipal bonds are traded primarily in the
over-the-counter ("OTC") markets and are valued at the last available bid price
in the OTC market or on the basis of values as obtained by a pricing service.
Pricing services use valuation matrixes that incorporate both dealer-supplied
valuations and valuation models. The procedures of the pricing service and its
valuations are reviewed by the officers of the Fund under the general direction
of the Board of Directors. Such valuations and procedures are reviewed
periodically by the Board of Directors of the Fund. Financial futures contracts
and options thereon, which are traded on exchanges, are valued at their closing
prices as of the close of such exchanges. Options written or purchased are
valued at the last sale price in the case of exchange-traded options. In the
case of options traded in the OTC market, valuation is the last asked price
(options written) or the last bid price (options purchased). Swap agreements are
valued by quoted fair values received daily by the Fund's pricing service.
Short- term investments with a remaining maturity of 60 days or less are valued
at amortized cost, which approximates market value, under which method the
investment is valued at cost and any premium or discount is amortized on a
straight line basis to maturity. Investments in open-end investment companies
are valued at their net asset value each business day. Securities and other
assets for which market quotations are not readily available are valued at fair
value as determined in good faith by or under the direction of the Board of
Directors of the Fund.

(b) Derivative financial instruments -- The Fund may engage in various portfolio
investment strategies both to increase the return of the Fund and to hedge, or
protect, its exposure to interest rate movements and movements in the securities
markets. Losses may arise due to changes in the value of the contract or if the
counterparty does not perform under the contract.

o     Financial futures contracts -- The Fund may purchase or sell financial
      futures contracts and options on such futures contracts. Futures contracts
      are contracts for delayed delivery of securities at a specific future date
      and at a specific price or yield. Upon entering into a contract, the Fund
      deposits and maintains as collateral such initial margin as required by
      the exchange on which the transaction is effected. Pursuant to the
      contract, the Fund agrees to receive from or pay to the broker an amount
      of cash equal to the daily fluctuation in value of the contract. Such
      receipts or payments are known as variation margin and are recorded by the
      Fund as unrealized gains or losses. When the contract is closed, the Fund
      records a realized gain or loss equal to the difference between the value
      of the contract at the time it was opened and the value at the time it was
      closed.

o     Options -- The Fund may write covered call options and purchase put
      options. When the Fund writes an option, an amount equal to the premium
      received by the Fund is reflected as an asset and an equivalent liability.
      The amount of the liability is subsequently marked-to-market to reflect
      the current market value of the option written. When a security is
      purchased or sold through an exercise of an option, the related premium
      paid (or received) is added to (or deducted from) the basis of the
      security acquired or deducted from (or added to) the proceeds of the
      security sold. When an option expires (or the Fund enters into a closing
      transaction), the Fund realizes a gain or loss on the option to the extent
      of the premiums received or paid (or gain or loss to the extent the cost
      of the closing transaction exceeds the premium paid or received).

      Written and purchased options are non-income producing investments.

o     Forward interest rate swaps -- The Fund may enter into forward interest
      rate swaps. In a forward interest rate swap, the Fund and the counterparty
      agree to make periodic net payments on a specified notional contract
      amount, commencing on a specified future effective date, unless terminated
      earlier. The value of the agreement is determined by quoted fair values
      received daily by the Fund from the counterparty. When the agreement is
      closed, the Fund records a realized gain or loss in an amount equal to the
      value of the agreement.


                MUNIASSETS FUND, INC.           MAY 31, 2005                  15


Notes to Financial Statements (concluded)

(c) Income taxes -- It is the Fund's policy to comply with the requirements of
the Internal Revenue Code applicable to regulated investment companies and to
distribute substantially all of its taxable income to its shareholders.
Therefore, no federal income tax provision is required.

(d) Security transactions and investment income -- Security transactions are
recorded on the dates the transactions are entered into (the trade dates).
Realized gains and losses on security transactions are determined on the
identified cost basis. Interest income is recognized on the accrual basis. The
Fund amortizes all premiums and discounts on debt securities.

(e) Dividends and distributions -- Dividends from net investment income are
declared and paid monthly. Distributions of capital gains are recorded on the
ex-dividend dates.

2. Investment Advisory Agreement and Transactions with Affiliates:

The Fund has entered into an Investment Advisory Agreement with Fund Asset
Management, L.P. ("FAM"). The general partner of FAM is Princeton Services, Inc.
("PSI"), an indirect, wholly-owned subsidiary of Merrill Lynch & Co., Inc. ("ML
& Co."), which is the limited partner.

FAM is responsible for the management of the Fund's portfolio and provides the
necessary personnel, facilities, equipment and certain other services necessary
to the operations of the Fund. For such services, the Fund pays a monthly fee of
.55% based upon the average weekly value of the Fund's net assets.

For the year ended May 31, 2005, the Fund reimbursed FAM $5,717 for certain
accounting services.

Certain officers and/or directors of the Fund are officers and/or directors of
FAM, PSI, and/or ML & Co.

3. Investments:

Purchases and sales of investments, excluding short-term securities, for the
year ended May 31, 2005, were $50,628,079 and $51,960,935, respectively.

4. Common Stock Transactions:

At May 31, 2005, the Fund had one class of shares of Common Stock, par value
$.10 per share, of which 200,000,000 shares were authorized.

5. Distributions to Shareholders:

The Fund paid a tax-exempt income dividend to holders of Common Stock in the
amount of $.069000 per share on June 29, 2005 to shareholders of record on June
14, 2005.

The tax character of distributions paid during the fiscal years ended May 31,
2005 and May 31, 2004 was as follows:

--------------------------------------------------------------------------------
                                                 5/31/2005            5/31/2004
--------------------------------------------------------------------------------
Distributions paid from:
  Tax-exempt income ..................          $16,462,568          $15,993,376
  Ordinary Income ....................                   --              104,855
                                                --------------------------------
Total distributions ..................          $16,462,568          $16,098,231
                                                ================================

As of May 31, 2005, the components of accumulated losses on a tax basis were as
follows:

-----------------------------------------------------------------------------
Undistributed tax-exempt income -- net ...................       $  3,826,072
Undistributed long-term capital gains -- net .............                 --
                                                                 ------------
Total undistributed earnings -- net ......................          3,826,072
Capital loss carryforward ................................        (31,361,746)*
Unrealized gains -- net ..................................          1,730,912**
                                                                 ------------
Total accumulated losses -- net ..........................       $(25,804,762)
                                                                 ============

*     On May 31, 2005, the Fund had a net capital loss carryforward of
      $31,361,746, of which $2,052,069 expires in 2007, $6,860,553 expires in
      2008, $3,487,083 expires in 2009, $2,260,830 expires in 2010, $7,452,325
      expires in 2011, $5,486,273 expires in 2012 and $3,762,613 expires in
      2013. This amount will be available to offset like amounts of any future
      taxable gains.
**    The difference between book-basis and tax-basis net unrealized gains is
      attributable primarily to the tax deferral of losses on straddles, the
      difference between book and tax amortization methods for premiums and
      discounts on fixed income securities, the deferral of post-October capital
      losses for tax purposes and the book/tax differences in the accrual of
      income on securities in default.


16              MUNIASSETS FUND, INC.           MAY 31, 2005


Report of Independent Registered Public Accounting Firm

To the Shareholders and Board of Directors of
MuniAssets Fund, Inc.:

We have audited the accompanying statement of assets, liabilities and capital,
including the schedule of investments, of MuniAssets Fund, Inc. as of May 31,
2005, and the related statement of operations for the year then ended, the
statements of changes in net assets for each of the two years in the period then
ended, and the financial highlights for each of the five years in the period
then ended. These financial statements and financial highlights are the
responsibility of the Fund's management. Our responsibility is to express an
opinion on these financial statements and financial highlights based on our
audits.

We conducted our audits in accordance with the standards of the Public Company
Accounting Oversight Board (United States). Those standards require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statements and financial highlights are free of material misstatement. The Fund
is not required to have, nor were we engaged to perform, an audit of its
internal control over financial reporting. Our audits included consideration of
internal controls over financial reporting as a basis for designing audit
procedures that are appropriate in the circumstances, but not for the purposes
of expressing an opinion on the effectiveness of the Fund's internal control
over financial reporting. Accordingly, we express no such opinion. An audit also
includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements, assessing the accounting principles
used and significant estimates made by management, as well as evaluating the
overall financial statement presentation. Our procedures included confirmation
of securities owned as of May 31, 2005, by correspondence with the custodian. We
believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements and financial highlights referred to
above present fairly, in all material respects, the financial position of
MuniAssets Fund, Inc. as of May 31, 2005, the results of its operations for the
year then ended, the changes in its net assets for each of the two years in the
period then ended, and its financial highlights for each of the five years in
the period then ended, in conformity with U.S. generally accepted accounting
principles.

Deloitte & Touche LLP
Princeton, New Jersey
July 15, 2005

Fund Certification (unaudited)

In September 2004, the Fund filed its Chief Executive Officer Certification for
the prior year with the New York Stock Exchange pursuant to Section 303A. 12(a)
of the New York Stock Exchange Corporate Governance Listing Standards.

The Fund's Chief Executive Officer and Chief Financial Officer Certifications
pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 were filed with the
Fund's Form N-CSR and are available on the Securities and Exchange Commission's
Web site at http://www.sec.gov.

Important Tax Information (unaudited)

All of the net investment income distributions paid monthly by MuniAssets Fund,
Inc. during the taxable year ended May 31, 2005 qualify as tax-exempt interest
dividends for federal income tax purposes.


                MUNIASSETS FUND, INC.           MAY 31, 2005                  17


Automatic Dividend Reinvestment Plan

The following description of the Fund's Automatic Dividend Reinvestment Plan
(the "Plan") is sent to you annually as required by federal securities laws.

Pursuant to the Fund's Plan, unless a holder of Common Stock otherwise elects,
all dividend and capital gains distributions will be automatically reinvested by
The Bank of New York (the "Plan Agent"), as agent for shareholders in
administering the Plan, in additional shares of Common Stock of the Fund.
Holders of Common Stock who elect not to participate in the Plan will receive
all distributions in cash paid by check mailed directly to the shareholder of
record (or, if the shares are held in street or other nominee name then to such
nominee) by The Bank of New York, as dividend paying agent. Such participants
may elect not to participate in the Plan and to receive all distributions of
dividends and capital gains in cash by sending written instructions to The Bank
of New York, as dividend paying agent, at the address set forth below.
Participation in the Plan is completely voluntary and may be terminated or
resumed at any time without penalty by written notice if received by the Plan
Agent not less than ten days prior to any dividend record date; otherwise such
termination will be effective with respect to any subsequently declared dividend
or distribution.

Whenever the Fund declares an income dividend or capital gains distribution
(collectively referred to as "dividends") payable either in shares or in cash,
non-participants in the Plan will receive cash and participants in the Plan will
receive the equivalent in shares of Common Stock. The shares will be acquired by
the Plan Agent for the participant's account, depending upon the circumstances
described below, either (i) through receipt of additional unissued but
authorized shares of Common Stock from the Fund ("newly issued shares") or (ii)
by purchase of outstanding shares of Common Stock on the open market
("open-market purchases") on the New York Stock Exchange or elsewhere. If, on
the payment date for the dividend, the net asset value per share of the Common
Stock is equal to or less than the market price per share of the Common Stock
plus estimated brokerage commissions (such conditions being referred to herein
as "market premium"), the Plan Agent will invest the dividend amount in newly
issued shares on behalf of the participant. The number of newly issued shares of
Common Stock to be credited to the participant's account will be determined by
dividing the dollar amount of the dividend by the net asset value per share on
the date the shares are issued, provided that the maximum discount from the then
current market price per share on the date of issuance may not exceed 5%. If, on
the dividend payment date, the net asset value per share is greater than the
market value (such condition being referred to herein as "market discount"), the
Plan Agent will invest the dividend amount in shares acquired on behalf of the
participant in open-market purchases.

In the event of a market discount on the dividend payment date, the Plan Agent
will have until the last business day before the next date on which the shares
trade on an "ex- dividend" basis or in no event more than 30 days after the
dividend payment date (the "last purchase date") to invest the dividend amount
in shares acquired in open-market purchases. It is contemplated that the Fund
will pay monthly income dividends. Therefore, the period during which
open-market purchases can be made will exist only from the payment date on the
dividend through the date before the next "ex-dividend" date, which typically
will be approximately ten days. If, before the Plan Agent has completed its
open-market purchases, the market price of a share of Common Stock exceeds the
net asset value per share, the average per share purchase price paid by the Plan
Agent may exceed the net asset value of the Fund's shares, resulting in the
acquisitions of fewer shares than if the dividend had been paid in newly issued
shares on the dividend payment date. Because of the foregoing difficulty with
respect to open-market purchases, the Plan provides that if the Plan Agent is
unable to invest the full dividend amount in open-market purchases during the
purchase period or if the market discount shifts to a market premium during the
purchase period, the Plan Agent will cease making open-market purchases and will
invest the uninvested portion of the dividend amount in newly issued shares at
the close of business on the last purchase date determined by dividing the
uninvested portion of the dividend by the net asset value per share.

The Plan Agent maintains all shareholders' accounts in the Plan and furnishes
written confirmation of all transactions in the account, including information
needed by shareholders for tax records. Shares in the account of each Plan
participant will be held by the Plan Agent in non-certificated form in the name
of the participant, and each shareholder's proxy will include those shares
purchased or received pursuant to the Plan. The Plan Agent will forward all
proxy solicitation materials to participants and vote proxies for shares held
pursuant to the Plan in accordance with the instructions of the participants.


18              MUNIASSETS FUND, INC.           MAY 31, 2005


In the case of shareholders such as banks, brokers or nominees which hold shares
of others who are the beneficial owners, the Plan Agent will administer the Plan
on the basis of the number of shares certified from time to time by the record
shareholders as representing the total amount registered in the record
shareholder's name and held for the account of beneficial owners who are to
participate in the Plan.

There will be no brokerage charges with respect to shares issued directly by the
Fund as a result of dividends or capital gains distributions payable either in
shares or in cash. However, each participant will pay a pro rata share of
brokerage commissions incurred with respect to the Plan Agent's open-market
purchases in connection with the reinvestment of dividends.

The automatic reinvestment of dividends and distributions will not relieve
participants of any federal, state or local income tax that may be payable (or
required to be withheld) on such dividends.

Shareholders participating in the Plan may receive benefits not available to
shareholders not participating in the Plan. If the market price plus commissions
of the Fund's shares is above the net asset value, participants in the Plan will
receive shares of the Fund at less than they could otherwise purchase them and
will have shares with a cash value greater than the value of any cash
distribution they would have received on their shares. If the market price plus
commissions is below the net asset value, participants will receive
distributions in shares with a net asset value greater than the value of any
cash distribution they would have received on their shares. However, there may
be insufficient shares available in the market to make distributions in shares
at prices below the net asset value. Also, since the Fund does not redeem
shares, the price on resale may be more or less than the net asset value.

The value of shares acquired pursuant to the Plan will generally be excluded
from gross income to the extent that the cash amount reinvested would be
excluded from gross income. If, when the Fund's shares are trading at a premium
over net asset value, the Fund issues shares pursuant to the Plan that have a
greater fair market value than the amount of cash reinvested, it is possible
that all or a portion of such discount (which may not exceed 5% of the fair
market value of the Fund's shares) could be viewed as a taxable distribution. If
the discount is viewed as a taxable distribution, it is also possible that the
taxable character of this discount would be allocable to all the shareholders,
including shareholders who do not participate in the Plan. Thus, shareholders
who do not participate in the Plan might be required to report as ordinary
income a portion of their distributions equal to their allocable share of the
discount.

Experience under the Plan may indicate that changes are desirable. Accordingly,
the Fund reserves the right to amend or terminate the Plan. There is no direct
service charge to participants in the Plan; however, the Fund reserves the right
to amend the Plan to include a service charge payable by the participants.

All correspondence concerning the Plan should be directed to the Plan Agent at
The Bank of New York, Church Street Station, P.O. Box 11258, New York, NY
10286-1258, Telephone: 800-432-8224.


                MUNIASSETS FUND, INC.           MAY 31, 2005                  19


Officers and Directors



                                                                                                       Number of
                                                                                                       Portfolios in   Other Public
                           Position(s)  Length of                                                      Fund Complex    Directorships
                           Held with    Time                                                           Overseen by     Held by
Name        Address & Age  Fund         Served   Principal Occupation(s) During Past 5 Years           Director        Director
====================================================================================================================================
Interested Director
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                     
Robert C.   P.O. Box 9011  President    2005 to  President of the MLIM/FAM-advised funds since 2005;   125 Funds       None
Doll, Jr.*  Princeton, NJ  and          present  President of MLIM and FAM since 2001; Co-Head         169 Portfolios
            08543-9011     Director              (Americas Region) thereof from 2000 to 2001 and
            Age: 50                              Senior Vice President from 1999 to 2001; President
                                                 and Director of Princeton Services, Inc. ("Princeton
                                                 Services") since 2001; President of Princeton
                                                 Administrators, L.P. ("Princeton Administrators")
                                                 since 2001; Chief Investment Officer of Oppenheimer
                                                 Funds, Inc. in 1999 and Executive Vice President
                                                 thereof from 1991 to 1999.
            ------------------------------------------------------------------------------------------------------------------------
            * Mr. Doll is a director, trustee or member of an advisory board of certain other investment companies for which MLIM or
              FAM acts as investment adviser. Mr. Doll is an "interested person," as defined in the Investment Company Act, of the
              Fund based on his current positions with MLIM, FAM, Princeton Services and Princeton Administrators. Directors serve
              until their resignation, removal or death, or until December 31 of the year in which they turn 72. As Fund President,
              Mr. Doll serves at the pleasure of the Board of Directors.

====================================================================================================================================
Independent Directors*
------------------------------------------------------------------------------------------------------------------------------------
James H.    P.O. Box 9095  Director     2002 to  Director, The China Business Group, Inc. since        38 Funds        None
Bodurtha    Princeton, NJ               present  1996 and Executive Vice President thereof from        55 Portfolios
            08543-9095                           1996 to 2003; Chairman of the Board, Berkshire
            Age: 61                              Holding Corporation since 1980; Partner, Squire,
                                                 Sanders & Dempsey from 1980 to 1993.
------------------------------------------------------------------------------------------------------------------------------------
Joe Grills  P.O. Box 9095  Director     1994 to  Member of the Committee of Investment of              38 Funds        Kimco
            Princeton, NJ               present  Employee Benefit Assets of the Association of         55 Portfolios   Realty
            08543-9095                           Financial Professionals ("CIEBA") since 1986;                         Corporation
            Age: 70                              Member of CIEBA's Executive Committee since 1988
                                                 and its Chairman from 1991 to 1992; Assistant
                                                 Treasurer of International Business Machines
                                                 Corporation ("IBM") and Chief Investment Officer
                                                 of IBM Retirement Funds from 1986 to 1993;
                                                 Member of the Investment Advisory Committee of
                                                 the State of New York Common Retirement Fund
                                                 since 1989; Member of the Investment Advisory
                                                 Committee of the Howard Hughes Medical Institute
                                                 from 1997 to 2000; Director, Duke University
                                                 Management Company from 1992 to 2004, Vice
                                                 Chairman thereof from 1998 to 2004 and Director
                                                 Emeritus thereof since 2004; Director, LaSalle
                                                 Street Fund from 1995 to 2001; Director, Kimco
                                                 Realty Corporation since 1997; Member of the
                                                 Investment Advisory Committee of the Virginia
                                                 Retirement System since 1998; Vice Chairman
                                                 thereof from 2002 to 2005 and Chairman thereof
                                                 since 2005; Director, Montpelier Foundation
                                                 since 1998 and its Vice Chairman since 2000;
                                                 Member of the Investment Committee of the
                                                 Woodberry Forest School since 2000; Member of
                                                 the Investment Committee of the National Trust
                                                 for Historic Preservation since 2000.



20              MUNIASSETS FUND, INC.           MAY 31, 2005


Officers and Directors (continued)



                                                                                                       Number of
                                                                                                       Portfolios in   Other Public
                           Position(s)  Length of                                                      Fund Complex    Directorships
                           Held with    Time                                                           Overseen by     Held by
Name        Address & Age  Fund         Served   Principal Occupation(s) During Past 5 Years           Director        Director
====================================================================================================================================
Independent Directors* (concluded)
------------------------------------------------------------------------------------------------------------------------------------
                                                                                                     
Herbert I.  P.O. Box 9095  Director     2002 to  John M. Olin Professor of Humanities, New York        38 Funds        None
London      Princeton, NJ               present  University since 1993 and Professor thereof since     55 Portfolios
            08543-9095                           1980; President, Hudson Institute since 1997
            Age: 66                              and Trustee thereof since 1980; Dean, Gallatin
                                                 Division of New York University from 1976 to 1993;
                                                 Distinguished Fellow, Herman Kahn Chair, Hudson
                                                 Institute from 1984 to 1985; Director, Damon Corp.
                                                 from 1991 to 1995; Overseer, Center for Naval
                                                 Analyses from 1983 to 1993.
------------------------------------------------------------------------------------------------------------------------------------
Roberta     P.O. Box 9095  Director     2002 to  Shareholder, Modrall, Sperling, Roehl, Harris &       38 Funds        None
Cooper      Princeton, NJ               present  Sisk, P.A. since 1993; President, American Bar        55 Portfolios
Ramo        08543-9095                           Association from 1995 to 1996 and Member of
            Age: 62                              the Board of Governors thereof from 1994 to 1997;
                                                 Shareholder, Poole, Kelly & Ramo, Attorneys at Law,
                                                 P.C. from 1977 to 1993; Director, ECMC Group
                                                 (service provider to students, schools and lenders)
                                                 since 2001; Director, United New Mexico Bank
                                                 (now Wells Fargo) from 1983 to 1988; Director,
                                                 First National Bank of New Mexico (now Wells
                                                 Fargo) from 1975 to 1976; Vice President, American
                                                 Law Institute since 2004.
------------------------------------------------------------------------------------------------------------------------------------
Robert S.   P.O. Box 9095  Director     1996 to  Principal of STI Management (investment adviser)      38 Funds        None
Salomon,    Princeton, NJ               present  since 1994; Chairman and CEO of Salomon Brothers      55 Portfolios
Jr.         08543-9095                           Asset Management from 1992 to 1995; Chairman
            Age: 68                              of Salomon Brothers Equity Mutual Funds from
                                                 1992 to 1995; regular columnist with Forbes
                                                 Magazine from 1992 to 2002; Director of Stock
                                                 Research and U.S. Equity Strategist at Salomon
                                                 Brothers Inc. from 1975 to 1991; Trustee,
                                                 Commonfund from 1980 to 2001.
------------------------------------------------------------------------------------------------------------------------------------
Stephen B.  P.O. Box 9095  Director     1993 to  Chairman of Fernwood Associates, Inc. (investment     39 Funds        None
Swensrud    Princeton, NJ               present  adviser) since 1996; Principal, Fernwood Associates   56 Portfolios
            08543-9095                           (financial consultants) since 1975; Chairman of
            Age: 71                              R.P.P. Corporation (manufacturing company)
                                                 since 1978; Director of International Mobile
                                                 Communications, Incorporated (telecommunications)
                                                 since 1998.
            ------------------------------------------------------------------------------------------------------------------------
            * Directors serve until their resignation, removal or death, or until December 31 of the year in which they turn 72.



                MUNIASSETS FUND, INC.           MAY 31, 2005                  21


Officers and Directors (concluded)



                           Position(s)  Length of
                           Held with    Time
Name        Address & Age  Fund         Served   Principal Occupation(s) During Past 5 Years
====================================================================================================================================
Fund Officers*
------------------------------------------------------------------------------------------------------------------------------------
                                     
Donald C.   P.O. Box 9011  Vice         1993 to  First Vice President of MLIM and FAM since 1997 and Treasurer thereof since 1999;
Burke       Princeton, NJ  President    present  Senior Vice President and Treasurer of Princeton Services since 1999 and Director
            08543-9011     and          and 1999 since 2004; Vice President of FAM Distributors, Inc. ("FAMD") since 1999; Vice
            Age: 45        Treasurer    to       President of MLIM and FAM from 1990 to 1997; Director of Taxation of MLIM from
                                        present  1990 to 2001; Vice President, Treasurer and Secretary of the IQ Funds since 2004.
------------------------------------------------------------------------------------------------------------------------------------
Kenneth A.  P.O. Box 9011  Senior       2003 to  Managing Director of MLIM since 2000; Director (Tax-Exempt Fund Management) of
Jacob       Princeton, NJ  Vice         present  MLIM from 1997 to 2000.
            08543-9011     President
            Age: 54
------------------------------------------------------------------------------------------------------------------------------------
John M.     P.O. Box 9011  Senior       2003 to  Managing Director of MLIM since 2000; Director (Tax-Exempt Fund Management) of
Loffredo    Princeton, NJ  Vice         present  MLIM from 1997 to 2000.
            08543-9011     President
            Age: 41
------------------------------------------------------------------------------------------------------------------------------------
Theodore R. P.O. Box 9011  Vice         1997 to  Managing Director of MLIM since 2005; Director (Municipal Tax-Exempt Fund
Jaeckel Jr. Princeton, NJ  President    present  Management) of MLIM since 1997; Vice President of MLIM since 1991.
            08543-9011
            Age: 45
------------------------------------------------------------------------------------------------------------------------------------
Jeffrey     P.O. Box 9011  Chief        2004 to  Chief Compliance Officer of the MLIM/FAM-advised funds and First Vice President and
Hiller      Princeton, NJ  Compliance   present  Chief Compliance Officer of MLIM (Americas Region) since 2004; Chief Compliance
            08543-9011     Officer               Officer of the IQ Funds since 2004; Global Director of Compliance at Morgan Stanley
            Age: 53                              Investment Management from 2002 to 2004; Managing Director and Global Director of
                                                 Compliance at Citigroup Asset Management from 2000 to 2002; Chief Compliance
                                                 Officer at Soros Fund Management in 2000; Chief Compliance Officer at Prudential
                                                 Financial from 1995 to 2000; Senior Counsel in the Commission's Division of
                                                 Enforcement in Washington, D.C. from 1990 to 1995.
------------------------------------------------------------------------------------------------------------------------------------
Alice A.    P.O. Box 9011  Secretary    2004 to  Director (Legal Advisory) of MLIM since 2002; Vice President of MLIM from 1999 to
Pellegrino  Princeton, NJ               present  2002; Attorney associated with MLIM since 1997; Secretary of MLIM, FAM, FAMD and
            08543-9011                           Princeton Services since 2004.
            Age: 45
            ------------------------------------------------------------------------------------------------------------------------
            * Officers of the Fund serve at the pleasure of the Board of Directors.
------------------------------------------------------------------------------------------------------------------------------------


Custodian

The Bank of New York
100 Church Street
New York, NY 10286

Transfer Agent

The Bank of New York
101 Barclay Street -- 11 East
New York, NY 10286

NYSE Symbol

MUA


22              MUNIASSETS FUND, INC.           MAY 31, 2005


Availability of Quarterly Schedule of Investments

The Fund files its complete schedule of portfolio holdings with the Securities
and Exchange Commission ("SEC") for the first and third quarters of each fiscal
year on Form N-Q. The Fund's Forms N-Q are available on the SEC's Web site at
http://www.sec.gov. The Fund's Forms N-Q may also be reviewed and copied at the
SEC's Public Reference Room in Washington, DC. Information on the operation of
the Public Reference Room may be obtained by calling 1-800-SEC-0330.

Electronic Delivery

The Fund offers electronic delivery of communications to its shareholders. In
order to receive this service, you must register your account and provide us
with e-mail information. To sign up for this service, simply access this Web
site at http://www.icsdelivery.com/live and follow the instructions. When you
visit this site, you will obtain a personal identification number (PIN). You
will need this PIN should you wish to update your e-mail address, choose to
discontinue this service and/or make any other changes to the service. This
service is not available for certain retirement accounts at this time.

                MUNIASSETS FUND, INC.           MAY 31, 2005                  23


[LOGO] Merrill Lynch Investment Managers

www.mlim.ml.com

--------------------------------------------------------------------------------

Mercury Advisors

A Division of Merrill Lynch Investment Managers

www.mercury.ml.com

MuniAssets Fund, Inc. seeks to provide shareholders with current income exempt
from federal income taxes by investing primarily in a portfolio of
medium-to-lower grade or unrated municipal obligations the interest on which, in
the opinion of bond counsel to the issuer, is exempt from federal income taxes.

This report, including the financial information herein, is transmitted to
shareholders of MuniAssets Fund, Inc. for their information. It is not a
prospectus. Past performance results shown in this report should not be
considered a representation of future performance. Statements and other
information herein are as dated and are subject to change.

A description of the policies and procedures that the Fund uses to determine how
to vote proxies relating to portfolio securities is available (1) without
charge, upon request, by calling toll-free 1-800-MER-FUND (1-800-637-3863); (2)
at www.mutualfunds.ml.com; and (3) on the Securities and Exchange Commission's
Web site at http://www.sec.gov. Information about how the Fund voted proxies
relating to securities held in the Fund's portfolio during the most recent
12-month period ended June 30 is available (1) at www.mutualfunds.ml.com and (2)
on the Securities and Exchange Commission's Web site at http://www.sec.gov.

MuniAssets Fund, Inc.
Box 9011
Princeton, NJ
08543-9011

                                                                  #16716 -- 5/05



Item 2 - Code of Ethics - The registrant has adopted a code of ethics, as of the
         end of the period covered by this report, that applies to the
         registrant's principal executive officer, principal financial officer
         and principal accounting officer, or persons performing similar
         functions. A copy of the code of ethics is available without charge
         upon request by calling toll-free 1-800-MER-FUND (1-800-637-3863).

Item 3 - Audit Committee Financial Expert - The registrant's board of directors
         has determined that (i) the registrant has the following audit
         committee financial experts serving on its audit committee and (ii)
         each audit committee financial expert is independent: (1) Joe Grills,
         (2) Andre F. Perold (resigned as of October 1, 2004), (3) Robert S.
         Salomon, Jr., and (4) Stephen B. Swensrud.

Item 4 - Principal Accountant Fees and Services

         (a) Audit Fees -         Fiscal Year Ending May 31, 2005 - $27,500
                                  Fiscal Year Ending May 31, 2004 - $26,000


         (b) Audit-Related Fees - Fiscal Year Ending May 31, 2005 - $0
                                  Fiscal Year Ending May 31, 2004 - $0

         (c) Tax Fees -           Fiscal Year Ending May 31, 2005 - $5,700
                                  Fiscal Year Ending May 31, 2004 - $5,610

         The nature of the services include tax compliance, tax advice and tax
         planning.

         (d) All Other Fees -     Fiscal Year Ending May 31, 2005 - $0
                                  Fiscal Year Ending May 31, 2004 - $0

         (e)(1) The registrant's audit committee (the "Committee") has adopted
         policies and procedures with regard to the pre-approval of services.
         Audit, audit-related and tax compliance services provided to the
         registrant on an annual basis require specific pre-approval by the
         Committee. The Committee also must approve other non-audit services
         provided to the registrant and those non-audit services provided to the
         registrant's affiliated service providers that relate directly to the
         operations and the financial reporting of the registrant. Certain of
         these non-audit services that the Committee believes are a) consistent
         with the SEC's auditor independence rules and b) routine and recurring
         services that will not impair the independence of the independent
         accountants may be approved by the Committee without consideration on a
         specific case-by-case basis ("general pre-approval"). However, such
         services will only be deemed pre-approved provided that any individual
         project does not exceed $5,000 attributable to the registrant or
         $50,000 for all of the registrants the Committee oversees. Any proposed
         services exceeding the pre-approved cost levels will require specific
         pre-approval by the Committee, as will any other services not subject
         to general pre-approval (e.g., unanticipated but permissible services).
         The Committee is informed of each service approved subject to general
         pre-approval at the next regularly scheduled in-person board meeting.

         (e)(2) 0%

         (f) Not Applicable

         (g) Fiscal Year Ending May 31, 2005 - $9,030,943
             Fiscal Year Ending May 31, 2004 - $16,581,086



         (h) The registrant's audit committee has considered and determined that
         the provision of non-audit services that were rendered to the
         registrant's investment adviser and any entity controlling, controlled
         by, or under common control with the investment adviser that provides
         ongoing services to the registrant that were not pre-approved pursuant
         to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible
         with maintaining the principal accountant's independence.

         Regulation S-X Rule 2-01(c)(7)(ii) - $945,000, 0%

Item 5 - Audit Committee of Listed Registrants - The following individuals are
         members of the registrant's separately-designated standing audit
         committee established in accordance with Section 3(a)(58)(A) of the
         Exchange Act (15 U.S.C. 78c(a)(58)(A)):

         James H. Bodurtha
         Joe Grills
         Herbert I. London
         Andre F. Perold (resigned as of October 1, 2004)
         Roberta Cooper Ramo
         Robert S. Solomon, Jr.
         Stephen B. Swensrud

Item 6 - Schedule of Investments - Not Applicable

Item 7 - Disclosure of Proxy Voting Policies and Procedures for Closed-End
         Management Investment Companies - Proxy Voting Policies and Procedures

         Each Fund's Board of Directors/Trustees has delegated to Merrill Lynch
         Investment Managers, L.P. and/or Fund Asset Management, L.P. (the
         "Investment Adviser") authority to vote all proxies relating to the
         Fund's portfolio securities. The Investment Adviser has adopted
         policies and procedures ("Proxy Voting Procedures") with respect to the
         voting of proxies related to the portfolio securities held in the
         account of one or more of its clients, including a Fund. Pursuant to
         these Proxy Voting Procedures, the Investment Adviser's primary
         objective when voting proxies is to make proxy voting decisions solely
         in the best interests of each Fund and its shareholders, and to act in
         a manner that the Investment Adviser believes is most likely to enhance
         the economic value of the securities held by the Fund. The Proxy Voting
         Procedures are designed to ensure that the Investment Adviser considers
         the interests of its clients, including the Funds, and not the
         interests of the Investment Adviser, when voting proxies and that real
         (or perceived) material conflicts that may arise between the Investment
         Adviser's interest and those of the Investment Adviser's clients are
         properly addressed and resolved.

         In order to implement the Proxy Voting Procedures, the Investment
         Adviser has formed a Proxy Voting Committee (the "Committee"). The
         Committee is comprised of the Investment Adviser's Chief Investment
         Officer (the "CIO"), one or more other senior investment professionals
         appointed by the CIO, portfolio managers and investment analysts
         appointed by the CIO and any other personnel the CIO deems appropriate.
         The Committee will also include two non-voting representatives from the
         Investment Adviser's Legal department appointed by the Investment
         Adviser's General Counsel. The Committee's membership shall be limited
         to full-time employees of the Investment Adviser. No person with any
         investment banking, trading, retail brokerage or research
         responsibilities for the Investment Adviser's affiliates may serve as a
         member of the Committee or participate in its decision making (except
         to the extent such person is asked by the Committee to present
         information to the Committee, on the same basis as other interested



         knowledgeable parties not affiliated with the Investment Adviser might
         be asked to do so). The Committee determines how to vote the proxies of
         all clients, including a Fund, that have delegated proxy voting
         authority to the Investment Adviser and seeks to ensure that all votes
         are consistent with the best interests of those clients and are free
         from unwarranted and inappropriate influences. The Committee
         establishes general proxy voting policies for the Investment Adviser
         and is responsible for determining how those policies are applied to
         specific proxy votes, in light of each issuer's unique structure,
         management, strategic options and, in certain circumstances, probable
         economic and other anticipated consequences of alternate actions. In so
         doing, the Committee may determine to vote a particular proxy in a
         manner contrary to its generally stated policies. In addition, the
         Committee will be responsible for ensuring that all reporting and
         recordkeeping requirements related to proxy voting are fulfilled.

         The Committee may determine that the subject matter of a recurring
         proxy issue is not suitable for general voting policies and requires a
         case-by-case determination. In such cases, the Committee may elect not
         to adopt a specific voting policy applicable to that issue. The
         Investment Adviser believes that certain proxy voting issues require
         investment analysis - such as approval of mergers and other significant
         corporate transactions - akin to investment decisions, and are,
         therefore, not suitable for general guidelines. The Committee may elect
         to adopt a common position for the Investment Adviser on certain proxy
         votes that are akin to investment decisions, or determine to permit the
         portfolio manager to make individual decisions on how best to maximize
         economic value for a Fund (similar to normal buy/sell investment
         decisions made by such portfolio managers). While it is expected that
         the Investment Adviser will generally seek to vote proxies over which
         the Investment Adviser exercises voting authority in a uniform manner
         for all the Investment Adviser's clients, the Committee, in conjunction
         with a Fund's portfolio manager, may determine that the Fund's specific
         circumstances require that its proxies be voted differently.

         To assist the Investment Adviser in voting proxies, the Committee has
         retained Institutional Shareholder Services ("ISS"). ISS is an
         independent adviser that specializes in providing a variety of
         fiduciary-level proxy-related services to institutional investment
         managers, plan sponsors, custodians, consultants, and other
         institutional investors. The services provided to the Investment
         Adviser by ISS include in-depth research, voting recommendations
         (although the Investment Adviser is not obligated to follow such
         recommendations), vote execution, and recordkeeping. ISS will also
         assist the Fund in fulfilling its reporting and recordkeeping
         obligations under the Investment Company Act.

         The Investment Adviser's Proxy Voting Procedures also address special
         circumstances that can arise in connection with proxy voting. For
         instance, under the Proxy Voting Procedures, the Investment Adviser
         generally will not seek to vote proxies related to portfolio securities
         that are on loan, although it may do so under certain circumstances. In
         addition, the Investment Adviser will vote proxies related to
         securities of foreign issuers only on a best efforts basis and may
         elect not to vote at all in certain countries where the Committee
         determines that the costs associated with voting generally outweigh the
         benefits. The Committee may at any time override these general policies
         if it determines that such action is in the best interests of a Fund.

From time to time, the Investment Adviser may be required to vote proxies in
respect of an issuer where an affiliate of the Investment Adviser (each, an
"Affiliate"), or a money management or other client of the Investment Adviser
(each, a "Client") is involved. The Proxy Voting Procedures and the Investment
Adviser's adherence to those procedures are designed to address such conflicts
of interest. The Committee intends to strictly adhere to the Proxy Voting
Procedures in all proxy matters, including matters involving Affiliates and
Clients. If, however, an issue representing a non-routine matter that is
material to an Affiliate or a widely known Client is involved such that the
Committee does not reasonably believe it is able to follow its guidelines (or if
the particular proxy matter is not addressed by the guidelines) and vote
impartially, the Committee may, in its discretion for the purposes of ensuring
that an independent determination is reached, retain an independent fiduciary to
advise the Committee on how to vote or to cast votes on behalf of the Investment
Adviser's clients.

         In the event that the Committee determines not to retain an independent
         fiduciary, or it does not follow the advice of such an independent
         fiduciary, the powers of the Committee shall pass to a subcommittee,
         appointed by the CIO (with advice from the Secretary of the Committee),
         consisting solely of Committee members selected by the CIO. The CIO
         shall appoint to the subcommittee, where appropriate, only persons
         whose job responsibilities do not include contact with the Client and
         whose job evaluations would not be affected by the Investment Adviser's
         relationship with the Client (or failure to retain such relationship).
         The subcommittee shall determine whether and how to vote all proxies on
         behalf of the Investment Adviser's clients or, if the proxy matter is,
         in their judgment, akin to an investment decision, to defer to the
         applicable portfolio managers, provided that, if the subcommittee
         determines to alter the Investment Adviser's normal voting guidelines
         or, on matters where the Investment Adviser's policy is case-by-case,
         does not follow the voting recommendation of any proxy voting service
         or other independent fiduciary that may be retained to provide research
         or advice to the Investment Adviser on that matter, no proxies relating
         to the Client may be voted unless the Secretary, or in the Secretary's
         absence, the Assistant Secretary of the Committee concurs that the
         subcommittee's determination is consistent with the Investment
         Adviser's fiduciary duties

         In addition to the general principles outlined above, the Investment
         Adviser has adopted voting guidelines with respect to certain recurring
         proxy issues that are not expected to involve unusual circumstances.
         These policies are guidelines only, and the Investment Adviser may
         elect to vote differently from the recommendation set forth in a voting
         guideline if the Committee determines that it is in a Fund's best
         interest to do so. In addition, the guidelines may be reviewed at any
         time upon the request of a Committee member and may be amended or
         deleted upon the vote of a majority of Committee members present at a
         Committee meeting at which there is a quorum.

         The Investment Adviser has adopted specific voting guidelines with
         respect to the following proxy issues:

o     Proposals related to the composition of the Board of Directors of issuers
      other than investment companies. As a general matter, the Committee
      believes that a company's Board of Directors (rather than shareholders) is
      most likely to have access to important, nonpublic information regarding a
      company's business and prospects, and is therefore best-positioned to set
      corporate policy and oversee management. The Committee, therefore,
      believes that the foundation of good corporate governance is the election
      of qualified, independent corporate directors who are likely to diligently
      represent the interests of shareholders and oversee management of the
      corporation in a manner that will seek to maximize shareholder value over
      time. In individual cases, the Committee may look at a nominee's history
      of representing shareholder interests as a director of other companies or
      other factors, to the extent the Committee deems relevant.

o     Proposals related to the selection of an issuer's independent auditors. As
      a general matter, the Committee believes that corporate auditors have a
      responsibility to represent the interests of shareholders and provide an
      independent view on the propriety of financial reporting decisions of
      corporate management. While the Committee will generally defer to a
      corporation's choice of auditor, in individual cases, the Committee may
      look at an auditors' history of representing shareholder interests as
      auditor of other companies, to the extent the Committee deems relevant.

o     Proposals related to management compensation and employee benefits. As a
      general matter, the Committee favors disclosure of an issuer's
      compensation and benefit policies and opposes excessive compensation, but
      believes that compensation matters are normally best determined by an
      issuer's board of directors, rather than shareholders. Proposals to
      "micro-manage" an issuer's compensation practices or to set arbitrary
      restrictions on compensation or benefits will, therefore, generally not be
      supported.

o     Proposals related to requests, principally from management, for approval
      of amendments that would alter an issuer's capital structure. As a general
      matter, the Committee will support requests that enhance the rights of
      common shareholders and oppose requests that appear to be unreasonably
      dilutive.



o     Proposals related to requests for approval of amendments to an issuer's
      charter or by-laws. As a general matter, the Committee opposes poison pill
      provisions.

o     Routine proposals related to requests regarding the formalities of
      corporate meetings.

o     Proposals related to proxy issues associated solely with holdings of
      investment company shares. As with other types of companies, the Committee
      believes that a fund's Board of Directors (rather than its shareholders)
      is best-positioned to set fund policy and oversee management. However, the
      Committee opposes granting Boards of Directors authority over certain
      matters, such as changes to a fund's investment objective, that the
      Investment Company Act envisions will be approved directly by
      shareholders.

o     Proposals related to limiting corporate conduct in some manner that
      relates to the shareholder's environmental or social concerns. The
      Committee generally believes that annual shareholder meetings are
      inappropriate forums for discussion of larger social issues, and opposes
      shareholder resolutions "micromanaging" corporate conduct or requesting
      release of information that would not help a shareholder evaluate an
      investment in the corporation as an economic matter. While the Committee
      is generally supportive of proposals to require corporate disclosure of
      matters that seem relevant and material to the economic interests of
      shareholders, the Committee is generally not supportive of proposals to
      require disclosure of corporate matters for other purposes.

Item 8 - Portfolio Managers of Closed-End Management Investment Companies - Not
         Applicable at this time

Item 9 - Purchases of Equity Securities by Closed-End Management Investment
         Company and Affiliated Purchasers - Not Applicable

Item 10 - Submission of Matters to a Vote of Security Holders - Not Applicable

Item 11 - Controls and Procedures

11(a) - The registrant's certifying officers have reasonably designed such
        disclosure controls and procedures to ensure material information
        relating to the registrant is made known to us by others particularly
        during the period in which this report is being prepared. The
        registrant's certifying officers have determined that the registrant's
        disclosure controls and procedures are effective based on our evaluation
        of these controls and procedures as of a date within 90 days prior to
        the filing date of this report.

11(b) - There were no changes in the registrant's internal control over
        financial reporting (as defined in Rule 30a-3(d) under the Act (17 CFR
        270.30a-3(d)) that occurred during the second fiscal half-year of the
        period covered by this report that has materially affected, or is
        reasonably likely to materially affect, the registrant's internal
        control over financial reporting.

Item 12 - Exhibits attached hereto

12(a)(1) - Code of Ethics - See Item 2

12(a)(2) - Certifications - Attached hereto

12(a)(3) - Not Applicable



12(b) -    Certifications - Attached hereto

Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment Company Act of 1940, the registrant has duly caused this report to be
signed on its behalf by the undersigned, thereunto duly authorized.

MuniAssets Fund, Inc.


By: /s/ Robert C. Doll, Jr.
    ---------------------------
    Robert C. Doll, Jr.,
    Chief Executive Officer of
    MuniAssets Fund, Inc.

Date: July 15, 2005

Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment Company Act of 1940, this report has been signed below by the
following persons on behalf of the registrant and in the capacities and on the
dates indicated.


By: /s/ Robert C. Doll, Jr.
    ---------------------------
    Robert C. Doll, Jr.,
    Chief Executive Officer of
    MuniAssets Fund, Inc.

Date: July 15, 2005


By: /s/ Donald C. Burke
    ---------------------------
    Donald C. Burke,
    Chief Financial Officer of
    MuniAssets Fund, Inc.

Date: July 15, 2005