INVESTMENT GRADE MUNICIPAL INCOME FUND
N-30D, 1996-05-31
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                                             INVESTMENT GRADE

                                             MUNICIPAL

                                             INCOME FUND INC.







                                             Semi-Annual Report


                                             March 31, 1996



       PAINEWEBBER
       INVEST WITH MORE INTELLIGENCE.




<PAGE>
- --------------------------------------------------------------------------------
 
                                                                    May 17, 1996
 
Dear Shareholder,
 
We are pleased to present you with the semi-annual report for Investment Grade
Municipal Income Fund Inc. for the six months ended March 31, 1996. Moderate
economic growth, low inflation and strong corporate earnings growth helped
propel the stock market to record-breaking levels during 1995. The bond market
also rallied during 1995, providing investors with their third-best year since
the 1920s.
 
Investor sentiment changed quickly in early March 1996, however, in response to
government reports showing higher-than-expected economic growth; there was a
sharp drop in bond prices and volatility in the stock market. Meanwhile, the
Federal Reserve's Open Market Committee decided to keep monetary policy
unchanged at the March 26, 1996 meeting. The Fed's decision not to lower rates
in March (and, again in May) suggests that officials do not foresee a recession
or accelerating inflation.
 
MUNICIPAL MARKET OVERVIEW
 
During the first few months of 1995, the municipal market rebounded strongly
from the lows reached in 1994, when the Fed's monetary tightening policy wreaked
havoc on the bond market. There were positive fundamentals for municipals during
1995, including low new issue supply and a declining interest rate environment.
However, during the spring of 1995, presidential candidates began suggesting new
Federal income tax policies. The most notable proposal was the flat tax, which
would eliminate all investment income from Federal taxation: under this plan,
Federal tax-exemption would no longer be the unique privilege of municipal
bonds, which could cause demand to decrease. The market's response to the flat
tax discussions was, we believe, overstated.
 
Flat tax fever was rampant during the first half of 1995 and, as a result,
demand dwindled and municipal securities underperformed Treasuries. However, by
the fourth quarter of 1995, the municipal market began outperforming the
Treasury market, as flat tax fears abated and new issue supply continued to be
low. As of March 31, 1996, high quality, long-term municipal bonds were yielding
an average of 85% of comparable maturity Treasury bonds, which is an
historically attractive yield level. (The municipal market reached its low
relative to Treasuries in the spring of 1995, prior to the mention of tax
reform.) It appears as though new issue supply will continue to be low and
demand for municipals continues to increase. Therefore, we expect that municipal
outperformance could continue for the remainder of 1996.
 
PORTFOLIO REVIEW
 
Effective January 22, 1996, Elbridge T. Gerry III assumed management
responsibility for the Fund. Mr. Gerry joined Mitchell Hutchins as Senior Vice
President in charge of all municipal investments from JP Morgan & Company, where
he began his career in 1981. At JP Morgan, Mr. Gerry co-managed the municipal
department with over $5 billion in municipal assets and for the past four years,
he was Vice President in the Global Asset Management Group.
 
- --------------------------------------------------------------------------------
 
<PAGE>
- --------------------------------------------------------------------------------
 
The Fund's total return for the six months ended March 31, 1996, based on the
Fund's net asset value was 3.93%, while the Fund's total return for the same
time period based on the Fund's market value was 7.30%. As of March 31, 1996,
the Fund's net asset value per share was $15.90, and its share price on the New
York Stock Exchange was $13.50.
 
The Fund paid dividends from net investment income to common shareholders, which
totalled $0.45 per share of common stock during the six months ended March 31,
1996. The Fund has paid a monthly dividend of $0.0750 per share of common stock
since July 1995. Given the current interest rate environment, we anticipate that
the monthly dividend will remain unchanged for the remainder of 1996.
 
The Fund's dividends benefitted from declining short-term interest rates during
the six months ended March 31, 1996. As short-term rates decreased, the benefit
derived from the Fund's Auction Preferred Shares ("APS") increased. As you know,
the Fund's dividends have benefitted in the past from the use of leverage
through the issuance of APS. By investing the proceeds of the APS offering in
longer-term municipal bonds, the Fund has been able to earn a spread, the
difference between short- and long-term interest rates, over the rate paid on
the APS, which is a short-term rate. The amount of the spread, after paying the
costs attributable to the APS, increases the dividends payable to common
shareholders. As always, our goal is to provide the best use of leverage for the
Fund to the common shareholders.

As of March 31, 1996, the Fund was fully invested in long-term municipal
securities with an average maturity of 21.4 years and was fully diversified.
Using the higher of Moody's Investors Service, Inc. or Standard & Poor's
ratings, the ratings mix in the portfolio as of March 31, 1996, was as follows:
 


                               [CHART]

Cash equivalents,
prerefunded bonds,
and AAA or Aaa 34.8%


AA or Aa 29.9%       BBB or Baa 6.7%        A1/A+ 1.5%        A or A 27.1%










The largest percentages of the Fund's net assets as of March 31, 1996 were
invested in securities of Illinois, 14.5%; New York 13.8%; and Texas 12.5%,
issuers. As of March 31, 1996, three of the largest sector holdings were water,
18.1%; power, 17.0%; and hospitals, 14.0%
 
Going forward, we see opportunities in select spots on the yield curve,
specifically issues in the fifteen to twenty year maturity range. We intend to
diversify the portfolio further to better position the Fund
 
- --------------------------------------------------------------------------------
 
                                       2
<PAGE>
- --------------------------------------------------------------------------------
 
across the yield curve and the credit spectrum as well as to increase the
structural variety of bonds included in the portfolio. These three
diversification strategies should offer the dual advantage of greater return
potential without increasing risk.
 
We value you as a shareholder and as a client, and thank you for your continued
support. We welcome any comments or questions you may have.
 
Sincerely,
 
<TABLE>
<S>                                         <C>
/s/ Margo Alexander                         /s/ Elbridge T. Gerry III
MARGO ALEXANDER                             ELBRIDGE T. GERRY III
President,                                  Senior Vice President,
 Mitchell Hutchins Asset Management Inc.     Mitchell Hutchins Asset Management Inc.
                                            Portfolio Manager,
                                             Investment Grade Municipal Income Fund Inc.
</TABLE>
 
- --------------------------------------------------------------------------------
 
                                       3
<PAGE>
Investment Grade Municipal Income Fund Inc.
- --------------------------------------------------------------------------------
Portfolio of Investments
March 31, 1996--(unaudited)
- --------------------------------------------------------------------------------
 
LONG-TERM MUNICIPAL BONDS--95.36%
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
PRINCIPAL
  AMOUNT                                        MOODY'S         S&P             MATURITY            INTEREST
  (000)                                          RATING        RATING            DATES               RATES            VALUE
- ----------                                    ------------  ------------  --------------------   --------------    ------------
<C>         <S>                               <C>           <C>           <C>                    <C>               <C>
ALASKA--2.91%
   $ 6,540  Valdez Marine Terminal
             British Petroleum Co.
             Sohio Pipeline Project.........      Aa3           AA-             12/01/25             7.000%        $  7,120,948
                                                                                                                   ------------
CALIFORNIA--1.45%
     3,500  California Public Works Board
             California State University....       A             A-             09/01/16             6.250            3,558,905
                                                                                                                   ------------
COLORADO--0.64%
     1,500  Denver City & County
             Excise Tax Revenue Bonds
             (MBIA Insured).................      Aaa           AAA             09/01/14             6.500            1,560,810
                                                                                                                   ------------
CONNECTICUT--4.05%
     9,650  Connecticut Housing Finance
            Authority.......................       Aa            AA       05/15/14 to 11/15/23   6.200 to 6.750       9,916,907
                                                                                                                   ------------
GEORGIA--0.21%
       500  Municipal Electric Authority of
            Georgia.........................       A             A              01/01/16             6.375              505,445
                                                                                                                   ------------
ILLINOIS--14.48%
     1,000  Illinois Educational Facilities
             Authority Northwestern
             University (Pre-refunded
             with U.S. Government Securities
             to
             12/01/01 @ 102)................       NR            AA             12/01/21             6.900            1,130,130
     3,000  Illinois Health Facilities
             Authority
             Glen Oaks Hospital.............      Baa1          BBB             11/15/19             7.000            3,069,180
     3,000  Illinois Health Facilities
             Authority
             Hinsdale Hospital..............      Baa1          BBB             11/15/19             7.000            3,054,270
     1,890  Illinois Toll & Highway
             Authority
             (FGIC Insured).................      Aaa           AAA             01/01/16             6.200            1,933,319
     7,380  Chicago Gas Supply People's
            Gas.............................      Aa3           AA-             03/01/15             6.875            7,835,198
     4,000  Chicago Water Works.............       A1           AA-             11/15/19             6.000            3,984,640
    11,600  Metropolitan Pier & Exposition
            Authority.......................       A             A+             06/15/27             6.500           11,880,952
     2,650  University of Illinois..........       Aa           AA-             04/01/22             5.750            2,543,126
                                                                                                                   ------------
                                                                                                                     35,430,815
                                                                                                                   ------------
INDIANA--10.77%
     6,750  Indiana Transportation Financing
            Authority.......................       A             NR             11/01/16             6.250            6,767,280
     6,000  Indianapolis Gas Utility (FGIC
            Insured)........................      Aaa           AAA             06/01/23             6.200            6,130,380
     2,000  Indianapolis Local Public
             Improvement
             Bond Bank......................       Aa           AA-             07/01/10             6.000            2,058,420
     4,000  Marion County Hospital Authority
             Methodist Hospital of
            Indiana.........................       Aa           AA-             09/01/13             6.500            4,187,040
     5,725  Petersburg County Pollution
             Control Indianapolis Power &
            Light Company...................      Aa2           AA-             12/01/24             6.625            6,126,952
     1,000  Purdue University...............       Aa           AA-             07/01/15             6.700            1,091,890
                                                                                                                   ------------
                                                                                                                     26,361,962
                                                                                                                   ------------
</TABLE>
 
                                       4
<PAGE>
Investment Grade Municipal Income Fund Inc.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
LONG-TERM MUNICIPAL BONDS--(CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
PRINCIPAL
  AMOUNT                                        MOODY'S         S&P             MATURITY            INTEREST
  (000)                                          RATING        RATING            DATES               RATES            VALUE
- ----------                                    ------------  ------------  --------------------   --------------    ------------
<C>         <S>                               <C>           <C>           <C>                    <C>               <C>
KENTUCKY--3.36%
   $ 7,750  Boone County Pollution Control
             Dayton Power & Light Co........      Aa3           AA-             11/15/22             6.500%        $  8,213,295
                                                                                                                   ------------
MASSACHUSETTS--7.45%
     8,500  Massachusetts Bay Transportation
            Authority.......................       A1            A+             03/01/23             6.100            8,488,355
     6,000  Massachusetts Water Resources
             Authority
             (Pre-refunded with U.S.
             Government
             Securities to 07/15/02 @
            102)............................      Aaa           AAA             07/15/21             6.500            6,685,560
     2,750  Massachusetts Water Resources
             Authority
             (Pre-refunded with U.S.
             Government
             Securities to 12/01/01 @
            102)............................      Aaa           AAA             12/01/19             6.500            3,056,377
                                                                                                                   ------------
                                                                                                                     18,230,292
                                                                                                                   ------------
NEVADA--2.95%
     6,750  Clark County Pollution Control
             Nevada Power (FGIC Insured)....      Aaa           AAA             06/01/19             6.600            7,230,060
                                                                                                                   ------------
NEW YORK--12.37%
     6,000  New York State Local Government
             Assistance Corp................       A             A              04/01/21             6.250            6,098,040
     5,350  New York State Local Government
             Assistance Corp.(Pre-refunded
             with U.S. Government Securities
            to 04/01/02 @ 102)..............      Aaa           AAA             04/01/21             6.750            6,028,433
     1,500  New York State Medical Care
             Facilities
             (FHA-Insured)..................       NR           AAA             02/15/31             6.600            1,560,075
     6,150  New York City General
            Obligation......................      Baa1          BBB+      02/01/16 to 08/01/17       7.000            6,473,367
    10,070  New York City Municipal Water
            Finance.........................       A             A-       06/15/17 to 06/15/21   6.000 to 6.250      10,103,615
                                                                                                                   ------------
                                                                                                                     30,263,530
                                                                                                                   ------------
NORTH CAROLINA--2.16%
     2,700  North Carolina Eastern Municipal
             Power Agency...................       A            BBB+            01/01/21             6.400            2,712,231
     2,550  North Carolina Municipal Power
             Agency Catawba Electric
            Revenue.........................       A             A-             01/01/17             6.250            2,566,754
                                                                                                                   ------------
                                                                                                                      5,278,985
                                                                                                                   ------------
PENNSYLVANIA--0.49%
     1,190  Philadelphia Hospitals and
             Higher Educational Facilities
            Authority Chestnut Hill
            Hospital........................       A             A-             11/15/22             6.500            1,196,902
                                                                                                                   ------------
RHODE ISLAND--2.57%
     6,175  Rhode Island Housing Finance....       Aa           AA+             04/01/27             6.500            6,279,666
                                                                                                                   ------------
</TABLE>
 
                                       5
<PAGE>
Investment Grade Municipal Income Fund Inc.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
LONG-TERM MUNICIPAL BONDS--(CONCLUDED)
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
PRINCIPAL
  AMOUNT                                        MOODY'S         S&P             MATURITY            INTEREST
  (000)                                          RATING        RATING            DATES               RATES            VALUE
- ----------                                    ------------  ------------  --------------------   --------------    ------------
<C>         <S>                               <C>           <C>           <C>                    <C>               <C>
SOUTH CAROLINA--5.02%
   $ 5,035  South Carolina Public Service
             Authority
             Santee Cooper (Pre-refunded
             with U.S. Government Securities
            to 07/01/02 @ 102)..............      Aaa           AAA             07/01/31             6.625%        $  5,641,567
     6,290  Richland County Pollution
             Control
             Union Camp.....................       A1            A-             11/01/20             6.550            6,642,177
                                                                                                                   ------------
                                                                                                                     12,283,744
                                                                                                                   ------------
TEXAS--12.47%
     5,000  Texas Health Facilities
             Development Corp.
             All Saints Episcopal Hospital
             (MBIA Insured).................      Aaa           AAA             08/15/22             6.250            5,138,750
     4,000  Coastal Bend Health Facilities
             Incarnate Word Health System
            (AMBAC Insured).................      Aaa           AAA             01/01/17             6.300            4,157,600
     4,750  Harris County
             Subordinated Lien Revenue......       Aa           AA-             08/01/14             6.750            5,135,748
       915  Harris County Toll Road
             Authority
             Senior Lien (AMBAC Insured)....      Aaa           AAA             08/15/17             6.500              971,913
     1,000  Houston Water & Sewer System....       A             A              12/01/14             6.375            1,041,420
     6,575  Houston Water & Sewer System
             (AMBAC Insured)................      Aaa           AAA             12/01/17             6.375            6,826,362
     6,750  Sabine River Authority Pollution
             Control
             (FGIC Insured).................      Aaa           AAA             10/01/22             6.550            7,239,577
                                                                                                                   ------------
                                                                                                                     30,511,370
                                                                                                                   ------------
VIRGINIA--4.34%
     4,500  Virginia Beach Development
             Authority
             Sentara Bayside Hospital.......       Aa            AA             11/01/21             6.300            4,518,495
     5,815  Virginia Transportation Board
             Revenue
             Route 28 Project...............       Aa            AA             04/01/18             6.500            6,095,457
                                                                                                                   ------------
                                                                                                                     10,613,952
                                                                                                                   ------------
WASHINGTON--4.87%
     4,500  Metropolitan Seattle Sewer (MBIA
            Insured)........................      Aaa           AAA             01/01/33             6.300            4,642,920
     6,625  Metropolitan Seattle Sewer
             (Pre-refunded
             with U.S. Government Securities
            to 01/01/00 @ 102)..............      Aaa           AA-             01/01/31             6.875            7,286,705
                                                                                                                   ------------
                                                                                                                     11,929,625
                                                                                                                   ------------
WISCONSIN--2.80%
     6,750  Wisconsin Health and Educational
             Facilities Authority Sisters of
             Sorrowful Mother Health Care
            System (MBIA Insured)...........      Aaa           AAA             06/01/20             6.250            6,861,443
                                                                                                                   ------------
TOTAL LONG-TERM MUNICIPAL BONDS
 (cost--$222,304,615).......................                                                                        233,348,656
                                                                                                                   ------------
</TABLE>
 
                                       6
<PAGE>
Investment Grade Municipal Income Fund Inc.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
SHORT-TERM MUNICIPAL NOTES--2.98%
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
PRINCIPAL
  AMOUNT                                        MOODY'S         S&P             MATURITY            INTEREST
  (000)                                          RATING        RATING            DATES               RATES            VALUE
- ----------                                    ------------  ------------  --------------------   --------------    ------------
<C>         <S>                               <C>           <C>           <C>                    <C>               <C>
FLORIDA--0.04%
     $ 100  Hillsborough County Pollution
            Control*........................     VMIG1          A-1+            04/01/96             3.700%        $    100,000
                                                                                                                   ------------
NEW YORK--1.43%
       200  New York City Series A*.........     VMIG1          A-1             04/01/96             3.850              200,000
     1,800  New York City Series B*.........     VMIG1          A-1+            04/01/96             3.800            1,800,000
       700  New York City Series E*.........     VMIG1          A-1+            04/01/96             3.750              700,000
       400  New York State Energy Research
             and Development Authority
             Pollution Control Revenue*.....     VMIG1          A-1+            04/01/96             3.400              400,000
       400  New York State Energy Research
             and Development Authority
             Pollution Control Revenue*.....     VMIG1          A-1+            04/01/96             3.450              400,000
                                                                                                                   ------------
                                                                                                                      3,500,000
                                                                                                                   ------------
WYOMING--1.51%
     3,700  Lincoln County Pollution
            Control*........................      P-1           A-1+            04/01/96             3.800            3,700,000
                                                                                                                   ------------
TOTAL SHORT-TERM MUNICIPAL NOTES
 (cost--$7,300,000).........................                                                                          7,300,000
                                                                                                                   ------------
TOTAL INVESTMENTS
 (cost--$229,604,615)--98.34%...............                                                                        240,648,656
Other assets in excess of
liabilities--1.66%..........................                                                                          4,051,410
                                                                                                                   ------------
NET ASSETS--100.00%.........................                                                                       $244,700,066
                                                                                                                   ------------
                                                                                                                   ------------
</TABLE>
 
- ------------
* Variable rate demand notes are payable on demand. The maturity date reflects
  earlier of reset date or maturity date. The interest rates shown are the
  current rates as of March 31, 1996 and reset daily.
 
AMBAC--American Municipal Bond Assurance Corporation
 
FGIC--Financial Guaranty Insurance Company
 
FHA--Federal Housing Authority
 
MBIA--Municipal Bond Investors Assurance
 
NR--Not Rated
 
                 See accompanying notes to financial statements
 
                                       7
<PAGE>
Investment Grade Municipal Income Fund Inc.
- --------------------------------------------------------------------------------
Statement of Assets and Liabilities
March 31, 1996--(unaudited)
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                                <C>
ASSETS
   Investments in securities, at value (cost--$229,604,615).....................   $240,648,656
   Cash.........................................................................         91,523
   Interest receivable..........................................................      4,371,620
   Deferred organizational expenses.............................................         60,202
   Other assets.................................................................          8,853
                                                                                   ------------
      Total assets..............................................................    245,180,854
                                                                                   ------------
 
LIABILITIES
   Payable to investment adviser and administrator..............................        135,380
   Dividends payable to preferred shareholders..................................        182,836
   Accrued expenses and other liabilities.......................................        162,572
                                                                                   ------------
      Total liabilities.........................................................        480,788
                                                                                   ------------
 
NET ASSETS
   Auction Preferred Shares Series A & B-1,600 non-participating shares
     authorized, issued and outstanding; $0.001 par value; $50,000 liquidation
     value......................................................................     80,000,000
                                                                                   ------------
   Common Stock--$0.001 par value; total authorized shares--199,998,400;
     10,356,667 shares issued and outstanding...................................         10,357
   Paid in capital in excess of par value of common shares......................    153,663,783
   Undistributed net investment income..........................................        432,255
   Accumulated net realized losses from investment transactions.................       (450,370)
   Net unrealized appreciation of investments...................................     11,044,041
                                                                                   ------------
      Net assets applicable to common shareholders..............................    164,700,066
                                                                                   ------------
      Total net assets..........................................................   $244,700,066
                                                                                   ------------
                                                                                   ------------
      Net asset value per common share ($164,700,066 applicable to 10,356,667
        common shares outstanding)..............................................         $15.90
</TABLE>
 
                 See accompanying notes to financial statements
 
                                       8
<PAGE>
Investment Grade Municipal Income Fund Inc.
- --------------------------------------------------------------------------------
Statement of Operations
For the Six Months Ended March 31, 1996 (unaudited)
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                                <C>
INVESTMENT INCOME:
   Interest.....................................................................   $ 7,400,718
                                                                                   -----------
EXPENSES:
   Investment advisory and administration.......................................     1,118,454
   Auction Preferred Shares expenses............................................       142,410
   Custody and accounting.......................................................        51,039
   Legal and audit..............................................................        33,942
   Reports and notices to shareholders..........................................        31,738
   Amortization of organizational expenses......................................        20,440
   Transfer agency and service fees.............................................         7,838
   Directors' fees..............................................................         5,500
   Other expenses...............................................................         6,876
                                                                                   -----------
                                                                                     1,418,237
Less: Fee waivers from adviser..................................................      (310,682)
                                                                                   -----------
Net expenses....................................................................     1,107,555
                                                                                   -----------
NET INVESTMENT INCOME...........................................................     6,293,163
                                                                                   -----------
REALIZED AND UNREALIZED GAINS (LOSSES) FROM INVESTMENT ACTIVITIES:
   Net realized gains from investment transactions..............................       --
   Net change in unrealized appreciation/depreciation of investments............     1,609,034
                                                                                   -----------
NET REALIZED AND UNREALIZED GAINS FROM INVESTMENT ACTIVITIES....................     1,609,034
                                                                                   -----------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS............................   $ 7,902,197
                                                                                   -----------
                                                                                   -----------
</TABLE>
 
                 See accompanying notes to financial statements
 
                                       9
<PAGE>
Investment Grade Municipal Income Fund Inc.
- --------------------------------------------------------------------------------
 
Statement of Changes in Net Assets
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                            For the Six Months
                                                                  Ended              For the Year
                                                              March 31, 1996            Ended
                                                               (unaudited)        September 30, 1995
                                                            ------------------    ------------------
<S>                                                         <C>                   <C>
FROM OPERATIONS:
   Net investment income.................................      $  6,293,163          $ 12,211,758
   Net realized losses from investment transactions......         --                     (447,179)
   Net change in unrealized appreciation/depreciation of
     investments.........................................         1,609,034            11,192,984
                                                            ------------------    ------------------
   Net increase in net assets resulting from
     operations..........................................         7,902,197            22,957,563
                                                            ------------------    ------------------
 
DIVIDENDS AND DISTRIBUTIONS FROM:
   Net investment income--common stockholders............        (4,660,500)           (9,323,071)
   Net investment income--preferred stockholders.........        (1,447,166)           (3,134,892)
                                                            ------------------    ------------------
      Total dividends and distributions to
        stockholders.....................................        (6,107,666)          (12,457,963)
                                                            ------------------    ------------------
   Net increase in net assets............................         1,794,531            10,499,600
 
NET ASSETS:
   Beginning of period...................................       242,905,535           232,405,935
                                                            ------------------    ------------------
   End of period (including undistributed net investment
     income of $432,255 and $246,758, respectively)......      $244,700,066          $242,905,535
                                                            ------------------    ------------------
                                                            ------------------    ------------------
</TABLE>
 
                 See accompanying notes to financial statements
 
                                       10
<PAGE>
Investment Grade Municipal Income Fund Inc.
- --------------------------------------------------------------------------------
Statement of Cash Flows
For the Six Months Ended March 31, 1996--(unaudited)
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                                 <C>
CASH FLOWS PROVIDED (USED) BY OPERATING ACTIVITIES:
   Interest received.............................................................   $ 7,390,066
   Expenses paid (net of fee waivers)............................................    (1,121,246)
   Purchase of short-term portfolio investments, net.............................      (200,000)
                                                                                    -----------
   Net cash provided by operating activities.....................................     6,068,820
                                                                                    -----------
CASH FLOWS USED FOR FINANCING ACTIVITIES:
   Dividends paid from net investment income to common stockholders..............    (4,660,500)
   Dividends paid from net investment income to preferred stockholders...........    (1,393,512)
                                                                                    -----------
   Net cash used for financing activities........................................    (6,054,012)
                                                                                    -----------
NET INCREASE IN CASH.............................................................        14,808
CASH AT BEGINNING OF PERIOD......................................................        76,715
                                                                                    -----------
CASH AT END OF PERIOD............................................................   $    91,523
                                                                                    -----------
                                                                                    -----------
RECONCILIATION OF NET INCREASE IN NET ASSETS RESULTING
 FROM OPERATIONS TO NET CASH PROVIDED BY OPERATING ACTIVITIES
   Net increase in net assets resulting from operations..........................   $ 7,902,197
                                                                                    -----------
   Increase in investments, at value.............................................    (1,823,118)
   Decrease in interest receivable...............................................         3,432
   Amortization of deferred organizational expenses..............................        20,440
   Increase in other assets......................................................        (8,853)
   Increase in payable to investment adviser and administrator...................         5,537
   Decrease in accrued expenses and other liabilities............................       (30,815)
                                                                                    -----------
      Total adjustments..........................................................    (1,833,377)
                                                                                    -----------
   Net cash provided by operating activities.....................................   $ 6,068,820
                                                                                    -----------
                                                                                    -----------
</TABLE>
 
                 See accompanying notes to financial statements
 
                                       11
<PAGE>
Investment Grade Municipal Income Fund Inc.
- --------------------------------------------------------------------------------
Notes to Financial Statements--(unaudited)
 
- --------------------------------------------------------------------------------
 
ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES
 
Investment Grade Municipal Income Fund Inc. (formerly PaineWebber Premier
Tax-Free Income Fund Inc.) (the "Fund") was incorporated in Maryland on August
6, 1992 and is registered with the Securities and Exchange Commission as a
closed-end diversified management investment company. Effective August 14, 1995,
the Fund commenced conducting business under the name "Investment Grade
Municipal Income Fund." The Board of Directors approved the change of the Fund's
name to Investment Grade Municipal Income Fund Inc. at a meeting held on June 2,
1995 and shareholders approved the name change on January 18, 1996.
Organizational costs have been deferred and are being amortized on the straight
line method over a period not to exceed 60 months from the date the Fund
commenced operations.
 
The preparation of financial statements in accordance with generally accepted
accounting principles requires Fund management to make estimates and assumptions
that affect the reported amounts and disclosures in the financial statements.
Actual results could differ from those estimates.
 
Valuation of Investments--Where market quotations are readily available,
portfolio securities are valued thereon, provided such quotations adequately
reflect the fair value of the securities, in the judgment of Mitchell Hutchins
Asset Management Inc. ("Mitchell Hutchins"), a wholly owned subsidiary of
PaineWebber Incorporated, investment adviser and administrator of the Fund. When
market quotations are not readily available, securities are valued based upon
appraisals received from a pricing service which utilizes a computerized matrix
pricing system, or based upon appraisals derived from information concerning
those securities or similar securities received from recognized dealers in those
securities. All other securities are valued at fair value as determined in good
faith by or under the direction of the Fund's board of directors. The amortized
cost method of valuation, which approximates market value, is used to value
certain debt obligations with 60 days or less remaining to maturity, unless the
Fund's board of directors determines that this does not represent fair value.
 
Investment Transactions and Investment Income--Investment transactions are
recorded on the trade date. Realized gains and losses from investment
transactions are calculated using the identified cost method. Interest income is
recorded on an accrual basis. Discounts are accreted and premiums are amortized
as adjustments to interest income and the identified cost of securities.
 
Dividends and Distributions--The Fund intends to pay monthly cash dividends to
common stockholders at a level rate that over time will result in the
distribution of all of the Fund's net investment income remaining after the
payment of dividends on any outstanding preferred stock. Dividends and
distributions to common stockholders are recorded on the ex-dividend date.
Dividends to preferred stockholders are accrued daily. Dividends from net
investment income and distributions from realized capital gains from investment
transactions are determined in accordance with federal income tax regulations
which may differ from generally accepted accounting principles. These "book/tax"
differences are either considered temporary or permanent in nature. To the
extent these differences are permanent in nature,
 
                                       12
<PAGE>
Investment Grade Municipal Income Fund Inc.
- --------------------------------------------------------------------------------
 
- --------------------------------------------------------------------------------
 
such amounts are reclassified within the capital accounts based on their federal
tax-basis treatment; temporary differences do not require reclassification.
 
CONCENTRATION OF RISK
 
The Fund follows an investment policy of investing primarily in municipal
obligations of various states. Economic changes affecting those states and
certain of their public bodies and municipalities may affect the ability of the
issuers within those states to pay interest on, or repay principal of municipal
obligations held by the Fund.
 
INVESTMENT ADVISER AND ADMINISTRATOR
 
The Fund's board of directors has approved an investment advisory and
administration contract ("Advisory Contract") with Mitchell Hutchins, under
which Mitchell Hutchins serves as investment adviser and administrator of the
Fund. In accordance with the Advisory Contract, Mitchell Hutchins receives
compensation from the Fund, computed weekly and paid monthly, at the annual rate
of 0.90% of the Fund's average weekly net assets. For the six months ended March
31, 1996, Mitchell Hutchins voluntarily waived a portion of its investment
advisory and administration fees from the Fund.
 
INVESTMENTS IN SECURITIES
 
For federal income tax purposes, the cost of securities owned at March 31, 1996,
was substantially the same as the cost of securities for financial statement
purposes.
 
At March 31, 1996, the components of the net unrealized appreciation of
investments were as follows:
 
<TABLE>
<S>                                                              <C>
Gross appreciation (from investments having an excess of value
over cost)....................................................   $11,119,269
Gross depreciation (from investments having an excess of cost
over value)...................................................       (75,228)
                                                                 -----------
Net unrealized appreciation of investments....................   $11,044,041
                                                                 -----------
                                                                 -----------
</TABLE>
 
FEDERAL INCOME TAX STATUS
 
The Fund intends to distribute substantially all of its tax-exempt income and
any taxable income and to comply with the other requirements of the Internal
Revenue Code applicable to regulated investment companies. Accordingly, no
provision for income taxes is required. In addition, by distributing during each
calendar year substantially all of its net investment income, capital gains and
certain other amounts, if any, the Fund intends not to be subject to a federal
excise tax.
 
At September 30, 1995, the Fund had a net capital loss carryforward of $3,191.
The loss carryforward is available as a reduction, to the extent provided in the
regulations, of future net realized capital gains,
 
                                       13
<PAGE>
Investment Grade Municipal Income Fund Inc.
- --------------------------------------------------------------------------------
 
- --------------------------------------------------------------------------------
 
and will expire by September 30, 2003. To the extent that such losses are used
to offset future capital gains, it is probable that the gains so offset will not
be distributed.
 
In accordance with Treasury Regulations, the Fund has elected to defer $447,179
of realized capital losses arising after October 31, 1994. Such losses have been
treated for tax purposes as arising on October 1, 1995.
 
CAPITAL STOCK
 
Common Stock
 
There are 199,998,400 shares of $0.001 par value common stock authorized. Of the
10,356,667 common shares outstanding, 6,667 shares are owned by Mitchell
Hutchins.
 
Auction Preferred Shares
 
The Fund has issued 800 shares of Auction Preferred Shares Series A and 800
shares of Auction Preferred Shares Series B, which are referred to herein
collectively as the "APS." All shares of each series of APS will have a
liquidation preference of $50,000 per share plus an amount equal to accumulated
but unpaid dividends upon liquidation.
 
Dividends, which are cumulative, are generally reset every 28 days for APS
Series A and 90 days for APS Series B. Dividend rates ranged from 3.25% to 4.05%
for the six months ended March 31, 1996.
 
The Fund is subject to certain restrictions relating to the APS. Failure to
comply with these restrictions could preclude the Fund from declaring any
distributions to common shareholders or repurchasing common shares and/or could
trigger the mandatory redemption of APS at liquidation value.
 
The APS are entitled to one vote per share and will vote with holders of common
stock as a single class, except that the preferred shares will vote separately
as a class on certain matters, as required by law. The holders of the preferred
shares have the right to elect two directors of the Fund.
 
                                       14
<PAGE>
Investment Grade Municipal Income Fund Inc.
- --------------------------------------------------------------------------------
 
Financial Highlights
- --------------------------------------------------------------------------------
 
Selected data for a share of common stock outstanding throughout each period is
presented below:
 
<TABLE>
<CAPTION>
                                                                                           For the Period
                                                  For the          For the Years Ended      November 6,
                                              Six Months Ended        September 30,        1992+ through
                                               March 31, 1996     ---------------------    September 30,
                                                (unaudited)         1995        1994            1993
                                              ----------------    --------    ---------    --------------
<S>                                           <C>                 <C>         <C>          <C>
Net asset value, beginning of period.......       $  15.73        $  14.72    $   17.04       $  15.00
                                                   -------        --------    ---------        -------
Net investment income......................           0.61            1.18         1.17           0.94
Net realized and unrealized gains (losses)
 from investments..........................           0.15            1.03        (2.28)          2.13
                                                   -------        --------    ---------        -------
Net increase (decrease) from investment
 operations................................           0.76            2.21        (1.11)          3.07
                                                   -------        --------    ---------        -------
Dividends from net investment income to:
 Common shareholders.......................          (0.45)          (0.90)       (0.98)         (0.73)
 Common share equivalent of dividends paid
   to preferred shareholders...............          (0.14)          (0.30)       (0.21)         (0.14)
Distributions from net realized gains from
   investment transactions.................        --                --           (0.02)       --
                                                   -------        --------    ---------        -------
Total dividends and distributions to
   shareholders............................          (0.59)          (1.20)       (1.21)         (0.87)
                                                   -------        --------    ---------        -------
Underwriting and offering costs incurred
 with the preferred stock offering charged
 to common stock...........................        --                --          --              (0.16)
                                                   -------        --------    ---------        -------
Net asset value, end of period.............       $  15.90        $  15.73    $   14.72       $  17.04
                                                   -------        --------    ---------        -------
                                                   -------        --------    ---------        -------
Per share market value, end of period......       $  13.50        $  13.00    $   12.38       $  15.63
                                                   -------        --------    ---------        -------
                                                   -------        --------    ---------        -------
Total investment return(1).................           7.30%          12.63%      (15.21)%         9.10%
                                                   -------        --------    ---------        -------
                                                   -------        --------    ---------        -------
Ratios to average net assets attributable
 to common shares:
 Total expenses net of waivers from
  adviser..................................           1.31%*          1.69%        1.70%          1.55%*
 Total expenses before waivers from
  adviser..................................           1.68%*          1.82%        1.70%          1.55%*
 Net investment income before preferred
  stock dividends..........................           7.45%*          7.87%        7.32%          6.55%*
 Preferred stock dividends.................           1.71%*          2.02%        1.33%          0.95%*
 Net investment income available to common
  shareholders.............................           5.74%*          5.85%        5.99%          5.60%*
Supplemental data:
 Net assets, end of period (000's).........       $244,700        $242,906    $ 232,406       $256,466
 Portfolio turnover rate...................              0%              7%           0%             6%
 Asset coverage per share of preferred
   stock, end of period....................       $152,938        $151,816    $ 145,254       $160,291
</TABLE>
 
- ------------
 + Commencement of operations
 
 * Annualized
 
(1) Total investment return is calculated assuming a purchase of common stock at
    the current market price on the first day and a sale at the current market
    price on the last day of each period reported and assuming reinvestment of
    dividends and other distributions to common shareholders at prices obtained
    under the Fund's Dividend Reinvestment Plan. Total investment returns for
    periods of less than one year have not been annualized. Total investment
    return does not reflect brokerage commissions.
 
                                       15
<PAGE>
Investment Grade Municipal Income Fund Inc.
- --------------------------------------------------------------------------------
 
General Information
- --------------------------------------------------------------------------------
 
THE FUND
 
Investment Grade Municipal Income Fund Inc. is a diversified closed-end
management investment company whose shares trade on the New York Stock Exchange,
Inc. ("NYSE"). The Fund's investment objective is to achieve a high level of
current income that is exempt from federal income tax, consistent with the
preservation of capital. The Fund's investment adviser and administrator is
Mitchell Hutchins Asset Management Inc., a wholly owned subsidiary of
PaineWebber Incorporated, which has over $43 billion in assets under management
as of April 30, 1996.
 
SHAREHOLDER INFORMATION
 
The Fund's NYSE trading symbol is "PPM." Weekly comparative net asset value and
market price information about the Fund is published each Monday in The Wall
Street Journal, each Sunday in The New York Times and each week in Barron's, as
well as numerous other newspapers.
 
An annual meeting of shareholders of the Fund was held on January 18, 1996. At
the meeting the following were approved for the Fund:
 
1) An amendment to the Fund's Articles of Incorporation to change the name of
the Fund from "PaineWebber Premier Tax-Free Income Fund Inc." to "Investment
Grade Municipal Income Fund Inc."
 
The votes were as follows:
 
                           ALL SHARES VOTING TOGETHER
 
<TABLE>
<CAPTION>
   SHARES           SHARES              SHARES
  VOTED FOR      VOTED AGAINST    WITHHOLD AUTHORITY
- -------------    -------------    ------------------
<S>              <C>              <C>
9,850,448.323      83,286.455         85,457.001
</TABLE>
 
2) The following were elected to serve as directors until the annual meeting of
shareholders in 1997, or until their successors are elected and qualified.
 
The votes were as follows:
 
                           ALL SHARES VOTING TOGETHER
 
<TABLE>
<CAPTION>
                                                          SHARES VOTED FOR    SHARES WITHHOLD AUTHORITY
                                                          ----------------    -------------------------
<S>                                                       <C>                 <C>
Richard Q. Armstrong...................................     9,860,275.133            158,916.646
E. Garrett Bewkes, Jr..................................     9,871,507.075            147,684.704
Ricard R. Burt.........................................     9,863,918.584            155,273.195
John R. Torell III.....................................     9,863,515.800            155,675.979
William D. White*......................................     9,857,760.251            161,431.528
</TABLE>
 
- ------------
 
* Effective April 11, 1996, Mr. White resigned as Director of the Fund at a
  special shareholder meeting held on April 11, 1996. Mary C. Farrell, George W.
  Gowen and Frederic V. Malek were elected to serve as directors of the Fund.
 
                                       16
<PAGE>
Investment Grade Municipal Income Fund Inc.
- --------------------------------------------------------------------------------
 
- --------------------------------------------------------------------------------
 
                            AUCTION PREFERRED SHARES
 
<TABLE>
<CAPTION>
                                                          SHARES VOTED FOR    SHARES WITHHOLD AUTHORITY
                                                          ----------------    -------------------------
<S>                                                       <C>                 <C>
Margo N. Alexander.....................................        834.000                  0.000
Meyer Feldberg.........................................        834.000                  0.000
</TABLE>
 
3) Ratification of Price Waterhouse LLP as the Fund's independent accountants
for the fiscal year ending September 30, 1996.
 
The votes were as follows:
 
                           ALL SHARES VOTING TOGETHER
 
<TABLE>
<CAPTION>
   SHARES           SHARES              SHARES
  VOTED FOR      VOTED AGAINST    WITHHOLD AUTHORITY
- -------------    -------------    ------------------
<S>              <C>              <C>
9,904,147.892      39,724.000         75,319.887
</TABLE>
 
(Broker non-votes and abstentions are included within the "Shares Withhold
Authority" totals.)
 
DISTRIBUTION POLICY
 
The Fund's Board of Directors has established a Dividend Reinvestment Plan (the
"Plan") under which all common stockholders whose shares are registered in their
own names, or in the name of PaineWebber or its nominee, will have all dividends
and other distributions on their shares of common stock automatically reinvested
in additional shares of common stock, unless such common stockholders elect to
receive cash. Common stockholders who elect to hold their shares in the name of
another broker or nominee should contact such broker or nominee to determine
whether, or how, they may participate in the Plan. Additional shares of common
stock acquired under the Plan will be purchased in the open market, on the NYSE,
at prices that may be higher or lower than the net asset value per share of the
common stock at the time of the purchase. The Fund will not issue any new shares
of common stock in connection with the Plan.
 
                                       17




<PAGE>

- ------------------------------------------------------------
DIRECTORS
E. Garrett Bewkes, Jr., Chairman
Margo N. Alexander
 Richard Q. Armstrong
Richard R. Burt
Mary C. Farrell
Meyer Feldberg
George W. Gowen
Frederic V. Malek
Carl W. Schafer
John R. Torell III

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

PRINCIPAL OFFICERS
Margo N. Alexander
President
Julian F. Sluyters
Vice President and Treasurer
Dianne E. O'Donnell
Vice President and Secretary
Victoria E. Schonfeld
Vice President
Dennis L. McCauley
Vice President
Elbridge T. Gerry III
Vice President
- ------------------------------------------------------------

INVESTMENT ADVISER
AND ADMINISTRATOR
Mitchell Hutchins Asset Management Inc.
1285 Avenue of the Americas
New York, New York 10019
- ------------------------------------------------------------

Notice is hereby given in accordance with Section 23(c) of
the Investment Company Act of 1940 that from time to
time the Fund may purchase at market prices shares of its
common stock in the open market.

This report is sent to the shareholders of the Fund for
their information. It is not a prospectus, circular or
represenation intended for the use in the purchase or sale
of shares of the Fund or any securities mentioned in this
report.

The financial information provided herein is taken from the
records of the Fund without examination by independent
accountants who do not express an opinion thereon.

C 1996 PaineWebber Incorporated





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