INVESTMENT GRADE MUNICIPAL INCOME FUND
N-30D, 1996-11-29
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<PAGE>
                        ANNUAL REPORT--NOVEMBER 14, 1996
- --------------------------------------------------------------------------------
 
                   DEAR SHAREHOLDER,
 
                         We are pleased to present you with the
                   annual report for Investment Grade Municipal
                   Income Fund Inc. (the "Fund") for the year ended
                   September 30, 1996.
 
                   GENERAL MARKET OVERVIEW
 
                         After exceptional performance during most
                   of 1995, 1996 to date has been difficult for
                   fixed income investors. Accelerating economic
                   growth, reflected in strong employment, retail
                   sales and investment spending numbers, as well as
                   a surprisingly robust housing sector, combined to
                   convince the market that, contrary to initial
                   expectations, the Federal Reserve Board (the
                   "Fed") would not move to ease interest rates. The
                   change in sentiment was clearly reflected in the
                   30-year U.S. Treasury bond, the benchmark of bond
                   market performance, as its yield increased from
                   5.95% on December 29, 1995, to 6.75% by August
                   31, 1996 (when bond yields increase, bond prices
                   decrease). These events established a pattern for
                   the remainder of the period, as ongoing economic
                   reports portraying the economy as growing too
                   rapidly continued to unsettle a jittery bond
                   market. August proved the exception, bringing a
                   glimmer of hope to the market; this was
                   short-lived, however, as disappointing economic
                   reports emerged over the last few trading days of
                   the month.
 
                   THE MUNICIPAL MARKET
 
                         While concerns over a flat tax early in the
                   fiscal year cast a shadow over the municipal
                   market, over the past few months the presidential
                   campaign rendered these fears nearly nonexistent.
                   Neither candidate focused heavily upon the topic
                   of tax restructuring, at least not to the extent
                   that it substantially impacted the municipal bond
                   market.
 
                         Adding to the positive municipal
                   environment in recent months was the fact that
                   municipals outperformed Treasuries, rising 60
                   basis points to hit their high yields in
                   mid-June, then rallying by 25 basis points as of
                   August 31, 1996. Also contributing to their
                   attractiveness was the continued slowdown in the
                   supply of new municipal issues; with fewer bonds
                   being issued, demand increased relative to
                   supply, thereby elevating the price of
<PAGE>
               -----------------------------------------------------------------
                  PORTFOLIO REVIEW
 
                   existing bonds. As of September 30, 1996,
                   high-quality, long-term municipal bonds were
                   yielding an average of 80% of comparable maturity
                   Treasury bonds.
 
                         Going forward, we anticipate that any
                   remaining flat tax concerns will continue to
                   subside and expect that any tax reform proposals
                   will not seriously impact municipals. We believe
                   that municipal bonds will continue to enjoy
                   tax-exemption, while other asset classes will
                   still be subject to taxes. Moreover, we expect
                   that municipal bonds will continue to stay on an
                   even keel relative to Treasuries, and that new
                   issue supply should continue to remain low and
                   demand for supply constant.
 
                   PORTFOLIO REVIEW
 
                         The Fund's total return for the 12 months
                   ended September 30, 1996, based on the Fund's
                   common stock net asset value was 8.33%, while the
                   Fund's total return for the same time period
                   based on the Fund's common stock market value was
                   12.03%. As of September 30, 1996, the Fund's net
                   asset value per share was $16.11, and its share
                   price on the New York Stock Exchange was $13.63
 
                         The Fund paid dividends from net investment
                   income to common shareholders, which totalled
                   $0.90 per share of common stock during the 12
                   months ended September 30, 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 benefited from
                   declining short-term interest rates during the 12
                   months ended September 30, 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
                   benefited in the past from the use of leverage
                   through the issuance of APS. That is, 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
 
                                       2
<PAGE>
               -----------------------------------------------------------------
                  PORTFOLIO REVIEW
 
                   the APS, increases the dividends payable to
                   individual shareholders. As always, our goal is
                   to provide the best use of leverage for the Fund
                   to individual shareholders.
 
                         As of September 30, 1996, the Fund was
                   fully invested in long-term municipal securities
                   with an average maturity of 21.1 years and was
                   fully diversified. Using the higher of Moody's
                   Investors Service, Inc. or Standard & Poor's
                   ratings, the rating mix in the portfolio as of
                   September 30, 1996 (as a percentage of portfolio
                   investments) was as follows:
 
                   EDGAR REPRESENTATION OF DATA POINTS USED IN
                   PRINTED GRAPHIC
 
<TABLE>
<S>          <C>
AAA or Aaa       34.3%
AA or Aa         31.6%
A or A           25.9%
BBB or Baa        5.2%
SP1 or MIG1       1.8%
A1 or P1          1.2%
</TABLE>
 
                         The largest percentages of the Fund's net
                   assets as of September 30, 1996, were invested in
                   securities of Illinois, 14.8%; New York, 13.4%;
                   and Texas, 12.5%. As of September 30, 1996 three
                   of the largest sector holdings were Water
                   Revenue, 17.7%; Power Revenue, 16.9%; and
                   Hospital Revenue, 13.8%.
 
                         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 across the yield
                   curve and the credit spectrum and increase the
                   structural variety of bonds included in the
                   portfolio. These three diversification strategies
                   should offer greater return potential without
                   increasing risk.
 
                                       3
<PAGE>
               -----------------------------------------------------------------
                  PORTFOLIO REVIEW
 
                         One final note--in October, 1996, Cynthia
                   Bow assumed co-portfolio management
                   responsibilities for the Fund, joining existing
                   portfolio manager and Senior Vice President in
                   charge of all municipal investments, Elbridge
                   (Ebby) T. Gerry III. Ms. Bow, who has been with
                   Mitchell Hutchins since 1982, is a vice president
                   and portfolio manager. She is also a vice
                   president of two investment companies for which
                   Mitchell Hutchins or PaineWebber serves as
                   investment adviser.
 
                         Our ultimate objective in managing your
                   investments is to help you successfully meet your
                   financial goals. We thank you for your continued
                   support, and welcome any comments or questions
                   you may have.
 
Sincerely,
 
         [SIGNATURE]                      [SIGNATURE]
MARGO ALEXANDER                           ELBRIDGE T. GERRY III
President,                                Senior Vice President,
Mitchell Hutchins Asset Management        Mitchell Hutchins Asset Management
Inc.                                      Inc.
                                          Portfolio Manager,
                                          Investment Grade Municipal Income Fund
                                          Inc.
 
           [SIGNATURE]
 
CYNTHIA BOW
Portfolio Manager,
Investment Grade Municipal
Income Fund Inc.
 
                                       4
<PAGE>
                                     INVESTMENT GRADE MUNICIPAL INCOME FUND INC.
 
               PORTFOLIO OF INVESTMENTS                       SEPTEMBER 30, 1996
 
<TABLE>
<CAPTION>
PRINCIPAL                                       MOODY'S
 AMOUNT                                         RATING       S&P RATING
  (000)                                       (UNAUDITED)    (UNAUDITED)       MATURITY DATES      INTEREST RATES      VALUE
- ---------                                     -----------    -----------    --------------------   --------------   ------------
<C>          <S>                              <C>            <C>            <C>                    <C>              <C>
LONG-TERM MUNICIPAL BONDS - 95.32%
ALASKA - 2.89%
 $ 6,540     Valdez Marine Terminal
               British Petroleum Co.
               Sohio Pipeline Project......       Aa3            AA               12/01/25             7.000%       $  7,123,957
                                                                                                                    ------------
CALIFORNIA - 1.45%
   3,500     California Public Works Board
               California State
               University..................        A              A               09/01/16             6.250           3,575,985
                                                                                                                    ------------
COLORADO - 0.64%
   1,500     Denver City & County
               Excise Tax Revenue Bonds
               (MBIA Insured)..............       Aaa            AAA              09/01/14             6.500           1,570,695
                                                                                                                    ------------
CONNECTICUT - 4.04%
   9,650     Connecticut Housing Finance
               Authority...................       Aa             AA         05/15/14 to 11/15/23   6.200 to 6.750      9,979,248
                                                                                                                    ------------
GEORGIA - 0.21%
     500     Municipal Electric Authority
               of Georgia..................        A              A               01/01/16             6.375             510,050
                                                                                                                    ------------
ILLINOIS - 14.79%
   1,000     Illinois Educational
               Facilities
               Authority--Northwestern
               University (Pre-refunded
               with U.S. Government
               Securities to 12/01/01 @
               $102).......................        A             AA               12/01/21             6.900           1,117,040
   3,000     Illinois Health Facilities
               Authority--Glen Oaks
               Hospital....................      Baa1            BBB              11/15/19             7.000           3,077,460
   3,000     Illinois Health Facilities
               Authority--Hinsdale
               Hospital....................      Baa1            BBB              11/15/19             7.000           3,079,530
   1,890     Illinois Toll & Highway
               Authority (FGIC Insured)....       Aaa            AAA              01/01/16             6.200           1,967,717
   7,380     Chicago Gas Supply People's
               Gas.........................       Aa3            AA-              03/01/15             6.875           7,917,116
   4,000     Chicago Water Works...........       A1             AA-              11/15/19             6.000           4,008,680
  11,600     Metropolitan Pier & Exposition
               Authority...................        A             AAA              06/15/27             6.500          12,739,816
   2,650     University of Illinois........       Aa             AA-              04/01/22             5.750           2,601,346
                                                                                                                    ------------
                                                                                                                      36,508,705
                                                                                                                    ------------
INDIANA - 10.77%
   6,750     Indiana Transportation
               Financing Authority.........        A             BBB              11/01/16             6.250           6,891,075
   6,000     Indianapolis Gas Utility
               (FGIC Insured)..............       Aaa            AAA              06/01/23             6.200           6,206,280
   2,000     Indianapolis Local Public
               Improvement Bond Bank.......       Aa             AA-              07/01/10             6.000           2,082,620
   4,000     Marion County Hospital
               Authority--Methodist
               Hospital of Indiana.........       Aa             AA-              09/01/13             6.500           4,195,600
   5,725     Petersburg County Pollution
               Control--Indianapolis Power
               & Light Company.............       Aa2            AA-              12/01/24             6.625           6,109,262
   1,000     Purdue University.............       Aa             AA-              07/01/15             6.700           1,087,320
                                                                                                                    ------------
                                                                                                                      26,572,157
                                                                                                                    ------------
</TABLE>
 
                                       5
<PAGE>
                                     INVESTMENT GRADE MUNICIPAL INCOME FUND INC.
 
<TABLE>
<CAPTION>
PRINCIPAL                                       MOODY'S
 AMOUNT                                         RATING       S&P RATING
  (000)                                       (UNAUDITED)    (UNAUDITED)       MATURITY DATES      INTEREST RATES      VALUE
- ---------                                     -----------    -----------    --------------------   --------------   ------------
<C>          <S>                              <C>            <C>            <C>                    <C>              <C>
LONG-TERM MUNICIPAL BONDS - (CONTINUED)
KENTUCKY - 3.28%
 $ 7,750     Boone County Pollution
               Control--Dayton Power &
               Light Co....................       Aa3            AA-              11/15/22             6.500%       $  8,100,455
                                                                                                                    ------------
MASSACHUSETTS - 7.42%
   8,500     Massachusetts Bay
               Transportation Authority....       A1             A+               03/01/23             6.100           8,646,370
   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           6,636,420
   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           3,025,880
                                                                                                                    ------------
                                                                                                                      18,308,670
                                                                                                                    ------------
NEVADA - 2.97%
   6,750     Clark County Pollution Control
               Nevada Power (FGIC
               Insured)....................       Aaa            AAA              06/01/19             6.600           7,323,075
                                                                                                                    ------------
NEW YORK - 12.30%
   6,000     New York State Local
               Government Assistance
               Corp........................        A              A               04/01/21             6.250           6,180,720
   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           5,967,551
   1,500     New York State Medical Care
               Facilities (FHA Insured)....       Aa             AAA              02/15/31             6.600           1,583,685
   6,150     New York City General
               Obligation..................      Baa1           BBB+        02/01/16 to 08/01/17       7.000           6,524,032
  10,070     New York City Municipal Water
               Finance.....................        A             A-         06/15/17 to 06/15/21   6.000 to 6.250     10,092,588
                                                                                                                    ------------
                                                                                                                      30,348,576
                                                                                                                    ------------
NORTH CAROLINA - 2.14%
   2,700     North Carolina Eastern
               Municipal Power Agency......        A            BBB+              01/01/21             6.400           2,711,664
   2,550     North Carolina Municipal Power
               Agency--Catawba Electric
               Revenue.....................        A             A-               01/01/17             6.250           2,561,093
                                                                                                                    ------------
                                                                                                                       5,272,757
                                                                                                                    ------------
PENNSYLVANIA - 0.48%
   1,190     Philadelphia Hospitals and
               Higher Educational
               Facilities Authority
               Chestnut Hill Hospital......      Baa1            A-               11/15/22             6.500           1,189,738
                                                                                                                    ------------
RHODE ISLAND - 2.56%
   6,175     Rhode Island Housing
               Finance.....................       Aa             AA+              04/01/27             6.500           6,313,876
                                                                                                                    ------------
</TABLE>
 
                                       6
<PAGE>
                                     INVESTMENT GRADE MUNICIPAL INCOME FUND INC.
 
<TABLE>
<CAPTION>
PRINCIPAL                                       MOODY'S
 AMOUNT                                         RATING       S&P RATING
  (000)                                       (UNAUDITED)    (UNAUDITED)       MATURITY DATES      INTEREST RATES      VALUE
- ---------                                     -----------    -----------    --------------------   --------------   ------------
<C>          <S>                              <C>            <C>            <C>                    <C>              <C>
LONG-TERM MUNICIPAL BONDS - (CONCLUDED)
SOUTH CAROLINA - 4.95%
 $ 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%       $  5,599,272
   6,290     Richland County Pollution
               Control--Union Camp Project
               Series C....................       A1             A-               11/01/20             6.550           6,626,767
                                                                                                                    ------------
                                                                                                                      12,226,039
                                                                                                                    ------------
TEXAS - 12.46%
   5,000     Texas Health Facilities
               Development Corp.--All
               Saints Episcopal Hospital
               (MBIA Insured)..............       Aaa            AAA              08/15/22             6.250           5,192,600
   4,000     Coastal Bend Health Facilities
               Incarnate Word Health System
               (AMBAC Insured).............       Aaa            AAA              01/01/17             6.300           4,185,280
   4,750     Harris County Subordinated
               Lien Revenue................       Aa             AA               08/01/14             6.750           5,156,220
     915     Harris County Toll Road
               Authority
               Senior Lien (AMBAC
               Insured)....................       Aaa            AAA              08/15/17             6.500             984,165
   1,000     Houston Water & Sewer
               System......................        A              A               12/01/14             6.375           1,037,550
   6,575     Houston Water & Sewer System
               (AMBAC Insured).............       Aaa            AAA              12/01/17             6.375           6,883,696
   6,750     Sabine River Authority
               Pollution Control (FGIC
               Insured)....................       Aaa            AAA              10/01/22             6.550           7,317,540
                                                                                                                    ------------
                                                                                                                      30,757,051
                                                                                                                    ------------
VIRGINIA - 4.35%
   4,500     Virginia Beach Development
               Authority--Sentara Bayside
               Hospital....................       Aa             AA               11/01/21             6.300           4,579,290
   5,815     Virginia Transportation Board
               Revenue--Route 28 Project...       Aa             AA               04/01/18             6.500           6,168,552
                                                                                                                    ------------
                                                                                                                      10,747,842
                                                                                                                    ------------
WASHINGTON - 4.81%
   4,500     Metropolitan Seattle Sewer
               (MBIA Insured)..............       Aaa            AAA              01/01/33             6.300           4,678,290
   6,625     Metropolitan Seattle Sewer
               (Pre-refunded with U.S.
               Government Securities to
               01/01/00 @ $102)............       Aaa            AAA              01/01/31             6.875           7,201,772
                                                                                                                    ------------
                                                                                                                      11,880,062
                                                                                                                    ------------
WISCONSIN - 2.81%
   6,750     Wisconsin Health and
               Educational Facilities
               Authority--Sisters of
               Sorrowful Mother Health Care
               System (MBIA Insured).......       Aaa            AAA              06/01/20             6.250           6,947,843
                                                                                                                    ------------
TOTAL LONG-TERM MUNICIPAL BONDS
  (cost--$222,318,496).....................                                                                          235,256,781
                                                                                                                    ------------
</TABLE>
 
                                       7
<PAGE>
                                     INVESTMENT GRADE MUNICIPAL INCOME FUND INC.
 
<TABLE>
<CAPTION>
PRINCIPAL                                       MOODY'S
 AMOUNT                                         RATING       S&P RATING
  (000)                                       (UNAUDITED)    (UNAUDITED)       MATURITY DATES      INTEREST RATES      VALUE
- ---------                                     -----------    -----------    --------------------   --------------   ------------
<C>          <S>                              <C>            <C>            <C>                    <C>              <C>
SHORT-TERM MUNICIPAL NOTES - 3.00%
ARIZONA - 0.24%
 $   600     Phoenix General Obligation
               Bonds*......................      VMIG1          A-1+              10/01/96             3.950%       $    600,000
                                                                                                                    ------------
FLORIDA - 0.37%
     900     Hillsborough County Pollution
               Control*....................      VMIG1          A-1+              10/01/96             3.900             900,000
                                                                                                                    ------------
NEW YORK - 1.13%
     200     New York City Series A*.......      VMIG1          A-1+              10/01/96             3.950             200,000
   1,600     New York City Series B*.......      VMIG1          A-1+              10/01/96         3.700 to 3.950      1,600,000
     700     New York City Series E*.......      VMIG1          A-1+              10/01/96             3.900             700,000
     300     New York State Energy Research
               and Development Authority
               Pollution Control
               Revenue*....................      VMIG1          A-1+              10/01/96             3.800             300,000
                                                                                                                    ------------
                                                                                                                       2,800,000
                                                                                                                    ------------
WYOMING - 1.26%
   3,100     Lincoln County Pollution
               Control*....................       P-1           A-1+              10/01/96             4.000           3,100,000
                                                                                                                    ------------
TOTAL SHORT-TERM MUNICIPAL NOTES
  (cost--$7,400,000).......................                                                                            7,400,000
                                                                                                                    ------------
TOTAL INVESTMENTS
  (cost--$229,718,496)--98.32%.............                                                                          242,656,781
Other assets in excess of
liabilities--1.68%.........................                                                                            4,147,035
                                                                                                                    ------------
NET ASSETS--100.00%........................                                                                         $246,803,816
                                                                                                                    ------------
                                                                                                                    ------------
</TABLE>
 
- ------------------------------
* Variable rate demand notes are payable on demand. The maturity dates shown are
  the next interest rate reset dates; the interest rates shown are the current
  rates as of September 30, 1996.
 
AMBAC -- American Municipal Bond Assurance Corporation
 
FGIC -- Financial Guaranty Insurance Company
 
FHA -- Federal Housing Authority
 
MBIA -- Municipal Bond Investors Assurance
 
                 See accompanying notes to financial statements
 
                                       8
<PAGE>
                                     INVESTMENT GRADE MUNICIPAL INCOME FUND INC.
 
               STATEMENT OF ASSETS AND LIABILITIES            SEPTEMBER 30, 1996
 
<TABLE>
<S>                                                                                                   <C>
ASSETS
Investments in securities, at value (cost--$229,718,496)............................................  $242,656,781
Cash................................................................................................        72,058
Interest receivable.................................................................................     4,372,719
Deferred organizational expenses....................................................................        42,270
                                                                                                      ------------
Total assets........................................................................................   247,143,828
                                                                                                      ------------
LIABILITIES
Payable to investment adviser and administrator.....................................................       130,285
Dividends payable to preferred shareholders.........................................................       126,322
Accrued expenses and other liabilities..............................................................        83,405
                                                                                                      ------------
Total liabilities...................................................................................       340,012
                                                                                                      ------------
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............................................................................   153,674,140
Undistributed net investment income.................................................................       641,761
Accumulated net realized losses from investment transactions........................................      (450,370)
Net unrealized appreciation of investments..........................................................    12,938,285
                                                                                                      ------------
Net assets applicable to common shareholders........................................................   166,803,816
                                                                                                      ------------
Total net assets....................................................................................  $246,803,816
                                                                                                      ------------
                                                                                                      ------------
Net asset value per common share ($166,803,816 applicable to 10,356,667 common shares
  outstanding)......................................................................................        $16.11
                                                                                                      ------------
                                                                                                      ------------
</TABLE>
 
                 See accompanying notes to financial statements
 
                                       9
<PAGE>
                                     INVESTMENT GRADE MUNICIPAL INCOME FUND INC.
 
               STATEMENT OF OPERATIONS     FOR THE YEAR ENDED SEPTEMBER 30, 1996
 
<TABLE>
<S>                                                                                                   <C>
INVESTMENT INCOME:
Interest............................................................................................  $14,796,367
                                                                                                      -----------
 
EXPENSES:
Investment advisory and administration..............................................................    2,208,189
Auction Preferred Shares expenses...................................................................      274,029
Custody and accounting..............................................................................      110,842
Legal and audit.....................................................................................       68,902
Reports and notices to shareholders.................................................................       67,787
Amortization of organizational expenses.............................................................       38,372
Transfer agency and service fees....................................................................       22,861
Directors' fees.....................................................................................       12,250
Other expenses......................................................................................       23,922
                                                                                                      -----------
                                                                                                        2,827,154
Less: Fee waivers from adviser......................................................................     (613,386)
                                                                                                      -----------
Net expenses........................................................................................    2,213,768
                                                                                                      -----------
NET INVESTMENT INCOME...............................................................................   12,582,599
                                                                                                      -----------
 
REALIZED AND UNREALIZED GAINS FROM INVESTMENT ACTIVITIES:
Net realized gains from investment transactions.....................................................      --
Net change in unrealized appreciation/depreciation of investments...................................    3,503,278
                                                                                                      -----------
 
NET REALIZED AND UNREALIZED GAINS FROM INVESTMENT ACTIVITIES........................................    3,503,278
                                                                                                      -----------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS................................................  $16,085,877
                                                                                                      -----------
                                                                                                      -----------
</TABLE>
 
                 See accompanying notes to financial statements
 
                                       10
<PAGE>
                                     INVESTMENT GRADE MUNICIPAL INCOME FUND INC.
 
               STATEMENT OF CHANGES IN NET ASSETS
 
<TABLE>
<CAPTION>
                                                                                        FOR THE YEARS
                                                                                     ENDED SEPTEMBER 30,
                                                                                  --------------------------
                                                                                      1996          1995
                                                                                  ------------  ------------
<S>                                                                               <C>           <C>
FROM OPERATIONS:
Net investment income...........................................................  $ 12,582,599  $ 12,211,758
Net realized losses from investment transactions................................       --           (447,179)
Net change in unrealized appreciation/depreciation of investments...............     3,503,278    11,192,984
                                                                                  ------------  ------------
Net increase in net assets resulting from operations............................    16,085,877    22,957,563
                                                                                  ------------  ------------
 
DIVIDENDS FROM:
Net investment income--common stockholders......................................    (9,321,000)   (9,323,071)
Net investment income--preferred stockholders...................................    (2,866,596)   (3,134,892)
                                                                                  ------------  ------------
Total dividends to stockholders.................................................   (12,187,596)  (12,457,963)
                                                                                  ------------  ------------
 
Net increase in net assets......................................................     3,898,281    10,499,600
 
NET ASSETS:
Beginning of year...............................................................   242,905,535   232,405,935
                                                                                  ------------  ------------
End of year (including undistributed net investment income of $641,761 and
  $246,758, respectively).......................................................  $246,803,816  $242,905,535
                                                                                  ------------  ------------
                                                                                  ------------  ------------
</TABLE>
 
                 See accompanying notes to financial statements
 
                                       11
<PAGE>
                                     INVESTMENT GRADE MUNICIPAL INCOME FUND INC.
 
               STATEMENT OF CASH FLOWS     FOR THE YEAR ENDED SEPTEMBER 30, 1996
 
<TABLE>
<S>                                                                                                   <C>
CASH FLOWS PROVIDED (USED) BY OPERATING ACTIVITIES:
Interest received...................................................................................  $14,770,735
Expenses paid (net of fee waivers)..................................................................   (2,284,936)
Purchase of short-term portfolio investments, net...................................................     (300,000)
                                                                                                      -----------
Net cash provided by operating activities...........................................................   12,185,799
                                                                                                      -----------
CASH FLOWS USED FOR FINANCING ACTIVITIES:
Dividends paid from net investment income to common stockholders....................................   (9,321,000)
Dividends paid from net investment income to preferred stockholders.................................   (2,869,456)
                                                                                                      -----------
Net cash used for financing activities..............................................................  (12,190,456)
                                                                                                      -----------
NET DECREASE IN CASH................................................................................       (4,657)
CASH AT BEGINNING OF YEAR...........................................................................       76,715
                                                                                                      -----------
CASH AT END OF YEAR.................................................................................  $    72,058
                                                                                                      -----------
                                                                                                      -----------
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................................................  $16,085,877
                                                                                                      -----------
Increase in investments, at value...................................................................   (3,831,243)
Decrease in interest receivable.....................................................................        2,333
Amortization of deferred organizational expenses....................................................       38,372
Increase in payable to investment adviser and administrator.........................................          442
Decrease in accrued expenses and other liabilities..................................................     (109,982)
                                                                                                      -----------
Total adjustments...................................................................................   (3,900,078)
                                                                                                      -----------
Net cash provided by operating activities...........................................................  $12,185,799
                                                                                                      -----------
                                                                                                      -----------
</TABLE>
 
                 See accompanying notes to financial statements
 
                                       12
<PAGE>
                NOTES TO FINANCIAL STATEMENTS
 
             ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES
 
             Investment Grade Municipal 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. 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. The following is a summary of
             significant accounting policies:
 
             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, such amounts are reclassified
             within the capital accounts based on their federal tax-basis
             treatment; temporary differences do not require reclassification.
 
                                       13
<PAGE>
             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 year ended
             September 30, 1996, Mitchell Hutchins voluntarily waived $613,386
             in investment advisory and administration fees from the Fund.
 
             INVESTMENTS IN SECURITIES
 
             For federal income tax purposes, the cost of securities owned at
             September 30, 1996, was substantially the same as the cost of
             securities for financial statement purposes.
 
             At September 30, 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)......................  $12,938,285
Gross depreciation (from investments having an
 excess of cost over value)......................      --
                                                   ----------
Net unrealized appreciation of investments.......  $12,938,285
                                                   ----------
                                                   ----------
</TABLE>
 
             FEDERAL 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, 1996, the Fund had a net capital loss carryforward
             of $450,370 which is available as a reduction, to the extent
             provided in the regulations, of future net realized capital gains,
             and will expire by September 30, 2004. 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.
 
                                       14
<PAGE>
             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, 7,124 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 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 year ended September 30, 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, unless otherwise
             required by law, 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.
 
                                       15
<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
                                                                                                          NOVEMBER 6,
                                                                              FOR THE YEARS ENDED            1992+
                                                                                 SEPTEMBER 30,              THROUGH
                                                                        -------------------------------  SEPTEMBER 30,
                                                                          1996       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.................................................       1.21       1.18       1.17         0.94
Net realized and unrealized gains (losses) from investments...........       0.35       1.03      (2.28)        2.13
                                                                        ---------  ---------  ---------  -------------
Net increase (decrease) from investment operations....................       1.56       2.21      (1.11)        3.07
                                                                        ---------  ---------  ---------  -------------
Dividends from net investment income to:
  Common stockholders.................................................      (0.90)     (0.90)     (0.98)       (0.73)
  Common share equivalent of dividends paid to preferred
   stockholders.......................................................      (0.28)     (0.30)     (0.21)       (0.14)
Distributions from net realized gains from investment transactions....     --         --          (0.02)      --
                                                                        ---------  ---------  ---------  -------------
Total dividends and distributions to stockholders.....................      (1.18)     (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........................................  $   16.11  $   15.73  $   14.72    $   17.04
                                                                        ---------  ---------  ---------  -------------
                                                                        ---------  ---------  ---------  -------------
Per share market value, end of period.................................  $   13.63  $   13.00  $   12.38    $   15.63
                                                                        ---------  ---------  ---------  -------------
                                                                        ---------  ---------  ---------  -------------
Total investment return(1)............................................      12.03%     12.63%    (15.21)%        9.10%
                                                                        ---------  ---------  ---------  -------------
                                                                        ---------  ---------  ---------  -------------
Ratios to average net assets attributable to common shares:
  Total expenses, net of waivers from adviser.........................       1.34%      1.69%      1.70%        1.55%*
  Total expenses, before waivers from adviser.........................       1.71%      1.82%      1.70%        1.55%*
  Net investment income before preferred stock dividends..............       7.61%      7.87%      7.32%        6.55%*
  Preferred stock dividends...........................................       1.73%      2.02%      1.33%        0.95%*
  Net investment income available to common stockholders..............       5.88%      5.85%      5.99%        5.60%*
Supplemental data:
  Net assets, end of period (000's)...................................  $ 246,804  $ 242,906  $ 232,406  $   256,466
  Portfolio turnover rate.............................................          0%         7%         0%           6%
  Asset coverage per share of preferred stock, end of period..........  $ 154,252  $ 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 stockholders at prices obtained
    under the Fund's Dividend Reinvestment Plan. Total investment return for
    periods of less than one year has not been annualized. Total investment
    return does not reflect brokerage commissions.
 
                                       16
<PAGE>
                                     INVESTMENT GRADE MUNICIPAL INCOME FUND INC.
 
                  REPORT OF INDEPENDENT ACCOUNTANTS
 
             To the Stockholders and Board of Directors of
             Investment Grade Municipal Income Fund Inc.
 
             In our opinion, the accompanying statement of assets and
             liabilities, including the portfolio of investments, and the
             related statements of operations, of changes in net assets and of
             cash flows and the financial highlights present fairly, in all
             material respects, the financial position of Investment Grade
             Municipal Income Fund (the "Fund") at September 30, 1996, the
             results of its operations and its cash flows for the year then
             ended, the changes in its net assets for each of the two years in
             the period then ended and the financial highlights for each of the
             three years in the period then ended and for the period November 6,
             1992 (commencement of operations) through September 30, 1993, in
             conformity with generally accepted accounting principles. These
             financial statements and financial highlights (hereafter referred
             to as "financial statements") are the responsibility of the Fund's
             management; our responsibility is to express an opinion on these
             financial statements based on our audits. We conducted our audits
             of these financial statements in accordance with generally accepted
             auditing standards which require that we plan and perform the audit
             to obtain reasonable assurance about whether the financial
             statements are free of material misstatement. An audit 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, and
             evaluating the overall financial statement presentation. We believe
             that our audits, which included confirmation of securities at
             September 30, 1996 by correspondence with the custodian, provide a
             reasonable basis for the opinion expressed above.
 
             PRICE WATERHOUSE LLP
             1177 Avenue of the Americas
             New York, New York 10036
 
             November 20, 1996
 
                                       17
<PAGE>
                                     INVESTMENT GRADE MUNICIPAL INCOME FUND INC.
 
                  TAX INFORMATION
 
             We are required by Subchapter M of the Internal Revenue Code of
             1986, as amended, to advise you within 60 days of the Fund's fiscal
             year end (September 30, 1996), as to the federal tax status of
             distributions received by stockholders during such fiscal year.
             Accordingly, we are advising you that all dividends paid during the
             fiscal year were federal tax-exempt interest dividends.
 
             The Fund did not invest in any securities which paid interest
             subject to the federal alternative minimum tax for individual
             taxpayers during its fiscal year. Therefore, none of the dividends
             paid by the Fund were subject to such tax.
 
             Because the Fund's fiscal year is not the calendar year, another
             notification will be sent in respect of calendar year 1996. The
             second notification, which reflects the amount to be used by
             calendar year taxpayers on their federal income tax returns, will
             be made in conjunction with Form 1099 DIV and will be mailed in
             January 1997. Stockholders are advised to consult their own tax
             advisers with respect to the tax consequences of their investment
             in the Fund.
 
                                       18
<PAGE>
                                     INVESTMENT GRADE MUNICIPAL INCOME FUND INC.
 
                  GENERAL INFORMATION
 
                  THE FUND
 
             Investment Grade Municipal Income Fund Inc. (the "Fund") 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 October 31, 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 in
             numerous other newspapers.
 
             A special meeting of shareholders was held on April 11, 1996, at
             which the following proposals were approved:
 
                  PROPOSAL 1
 
             To vote for or against the election of the Board of Directors:
 
<TABLE>
<CAPTION>
                                                                                    SHARES
                                                                     SHARES        WITHHOLD
                                                                   VOTED FOR      AUTHORITY
                                                                   ----------  ----------------
<S>                                                                <C>         <C>
Richard Q. Armstrong.............................................   5,249,349        246,892
E. Garrett Bewkes, Jr. ..........................................   5,254,074        242,167
Richard R. Burt..................................................   5,251,723        244,518
Mary C. Farrell..................................................   5,251,707        244,534
George W. Gowen..................................................   5,247,939        248,302
Frederic V. Malek................................................   5,240,340        255,901
Carl W. Schafer..................................................   5,250,879        245,362
John R. Torrell III..............................................   5,243,236        253,005
</TABLE>
 
                 PROPOSAL 2
              AUCTION PREFERRED SHARES:
 
             To vote for or against the election of its Board of Directors:
 
<TABLE>
<CAPTION>
                                                                       SHARES             SHARES
                                                                      VOTED FOR     WITHHOLD AUTHORITY
                                                                     -----------  -----------------------
<S>                                                                  <C>          <C>
Margo N. Alexander.................................................       1,133                  0
Meyer Feldberg.....................................................       1,133                  0
</TABLE>
 
             (BROKER NON-VOTES AND ABSTENTIONS ARE INCLUDED WITHIN THE "SHARES
             WITHHOLD AUTHORITY" AND "SHARES ABSTAIN" TOTALS.)
 
                                       19
<PAGE>
                                     INVESTMENT GRADE MUNICIPAL INCOME FUND INC.
 
                  PROPOSAL 3
 
             To vote for or against the following changes to the Fund's
             fundamental investment restrictions and policies:
 
<TABLE>
<CAPTION>
                                                                                SHARES
                                                                     SHARES      VOTED     SHARES
                                                                    VOTED FOR   AGAINST    ABSTAIN
                                                                    ---------  ---------  ---------
<S>                                                                 <C>        <C>        <C>
Modification of fundamental restriction on portfolio
  diversification:................................................  4,632,020    163,316    200,905
Modification of fundamental restriction on concentration:.........  4,626,823    164,008    205,407
Modification of fundamental restriction on senior securities and
  borrowing:......................................................  4,610,630    157,752    227,860
Modification of fundamental restriction on making loans:..........  4,600,746    196,505    198,990
Modification of fundamental restriction on underwriting
  securities:.....................................................  4,620,216    169,867    206,158
Modification of fundamental restriction on real estate
  investments:....................................................  4,626,862    150,567    218,812
Modification of fundamental restriction on investing in
  commodities:....................................................  4,597,135    185,784    213,322
Elimination of fundamental restriction on margin transactions:....  4,580,577    212,896    202,768
Elimination of fundamental restriction on short sales:............  4,581,495    197,652    217,095
Elimination of fundamental restriction on investments in oil, gas
  and mineral leases and programs:................................  4,631,334    171,924    192,984
</TABLE>
 
                  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.
 
                                       20
<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
  Elbridge T. Gerry III
  VICE PRESIDENT
  Cynthia Bow
  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 representation intended for the use in
  the purchase or sale of shares of the Fund or any securities mentioned in
  this report.
 
                                     [LOGO]
 
                       -C-1996 PaineWebber Incorporated
                                  Member SIPC
 
         -----------------------------------------------
 
            I N V E S T M E N T
            G R A D E
            M U N I C I P A L
            I N C O M E
            F U N D  I N C.
 
         SEPTEMBER 30, 1996
         ANNUAL REPORT


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