INSURED MUNICIPAL INCOME FUND INC
POS 8C, 1997-05-30
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      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MAY 30, 1997
    

                                                SECURITIES ACT FILE NO. 33-58532
                                        INVESTMENT COMPANY ACT FILE NO. 811-7528
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                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

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

                                    FORM N-2
           REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933           [X]
                         PRE-EFFECTIVE AMENDMENT NO.                         [ ]
                       POST-EFFECTIVE AMENDMENT NO. 4                        [X]
                                       AND
       REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940       [X]
                               AMENDMENT NO. 9                               [X]
                        (CHECK APPROPRIATE BOX OR BOXES)

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

                       INSURED MUNICIPAL INCOME FUND INC.
               (Exact name of Registrant as specified in charter)
                           1285 Avenue of the Americas
                            New York, New York 10019
                    (Address of principal executive offices)
       Registrant's Telephone Number, including Area Code: (212) 713-2000

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

                            DIANNE E. O'DONNELL, ESQ.
                          Vice President and Secretary
                       INSURED MUNICIPAL INCOME FUND INC.
                           1285 Avenue of the Americas
                            New York, New York 10019
                     (Name and address of agent for service)

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

   
                                   COPIES TO:

ROBERT A. WITTIE, ESQ.                         GREGORY K. TODD, ESQ.
JENNIFER R. GONZALEZ, ESQ.                     MITCHELL HUTCHINS ASSET
KIRKPATRICK & LOCKHART LLP                       MANAGEMENT INC.
1800 Massachusetts Avenue, N.W.                1285 Avenue of the Americas
Washington, D.C. 20036-1800 New York, New York 10019

    
                                   -----------

   If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box: [X]

   It is proposed that this filing will become effective (check appropriate box)
[X] when declared effective pursuant to Section 8(c).

   This Registration Statement relates to the registration of an indeterminate
number of shares solely for market-making transactions.

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                                        INSURED MUNICIPAL INCOME FUND INC.
                                          FORM N-2 CROSS REFERENCE SHEET

<TABLE>
<CAPTION>
      PART A
   ITEM NUMBER                          CAPTION                                         PROSPECTUS
   -----------                          -------                                         ----------
<S>                 <C>                                              <C>
         1          Outside Front Cover............................  Outside Front Cover of Prospectus
         2          Inside Front and Outside Back Cover Page.......  Inside Front and Outside Back Cover Page of
                                                                     Prospectus
         3          Fee Table and Synopsis.........................  Fund Expenses
         4          Financial Highlights...........................  Financial Highlights
         5          Plan of Distribution...........................  Outside Front Cover; The Offering
         6          Selling Shareholders...........................  Not Applicable
         7          Use of Proceeds................................  Use of Proceeds
         8          General Description of Registrant..............  Trading History; The Fund; Investment
                                                                     Objective and Policies; Insurance; Other
                                                                     Investment Practices; Special Leverage
                                                                     Considerations; Description of Capital Stock
         9          Management.....................................  Management of the Fund; Custodian, Transfer
                                                                     and Dividend Disbursing Agent and Registrar;
                                                                     Description of Capital Stock
        10          Capital Stock, Long-Term Debt and Other          Special Leverage Considerations; Dividends
                    Securities.....................................  and Other Distributions; Dividend
                                                                     Reinvestment Plan; Description of Capital
                                                                     Stock; Taxation
        11          Defaults and Arrears on Senior Securities......  Not Applicable
        12          Legal Proceedings..............................  Not Applicable
        13          Table of Contents of the Statement of
                    Additional Information.........................  Table of Contents of the Statement of
                                                                     Additional Information
</TABLE>


<TABLE>
<CAPTION>
      PART B                                                                           STATEMENT OF
   ITEM NUMBER                          CAPTION                                   ADDITIONAL INFORMATION
   -----------                          -------                                   ----------------------
<S>                 <C>                                              <C>
        14          Cover Page.....................................  Cover Page of Statement of Additional
                                                                     Information
        15          Table of Contents..............................  Outside Back Cover Page of Statement of
                                                                     Additional Information
        16          General Information and History................  Not Applicable
        17          Investment Objective and Policies..............  Investment Policies and Restrictions; Hedging
                                                                     and Related Income Strategies; Portfolio
                                                                     Transactions
        18          Management.....................................  Directors and Officers
        19          Control Persons and Principal Holders of
                    Securities.....................................  Control Persons and Principal Holders of
                                                                     Securities
        20          Investment Advisory and Other Services.........  Investment Advisory Arrangements; Additional
                                                                     Information; Management of the Fund (in
                                                                     Prospectus); Custodian, Transfer and Dividend
                                                                     Disbursing Agent and Registrar (in Prospectus)
        21          Brokerage Allocation and Other Practices.......  Portfolio Transactions
        22          Tax Status.....................................  Taxes
        23          Financial Statements...........................  Financial Statements
</TABLE>






<PAGE>
<PAGE>
                       INSURED MUNICIPAL INCOME FUND INC.
                                  COMMON STOCK
   
                            ------------------------
     Insured  Municipal Income Fund  Inc. ('Fund') is  a diversified, closed-end
management investment company. 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. To  achieve this objective, the Fund  normally
invests  substantially all of its assets in a diversified portfolio of long-term
Municipal Obligations that are  insured as to timely  payment of both  principal
and  interest  by an  entity  with claims-paying  ability  rated Aaa  by Moody's
Investors Service, Inc. ('Moody's'), AAA by Standard & Poor's, a division of The
McGraw-Hill Companies,  Inc.  ('S&P'),  or an  equivalent  rating  from  another
nationally recognized statistical rating organization ('NRSRO') or, with respect
to  20% of the  Fund's total assets, that  are (1) backed by  an escrow or trust
account  containing  sufficient  U.S.  government  or  U.S.  government   agency
securities  to  ensure  the  timely  payment  of  principal  and  interest,  (2)
guaranteed as to the timely payment of principal and interest by an entity which
has a credit rating  of Aaa by Moody's,  AAA by S&P or  an equivalent rating  by
another NRSRO or (3) rated Aaa by Moody's, AAA by S&P or an equivalent rating by
another  NRSRO.  No  assurance can  be  given  that the  Fund  will  achieve its
investment  objective.  All  or  a  portion  of  the  Fund's  dividends  may  be
attributable  to interest income that is an  item of tax preference for purposes
of the federal alternative minimum tax.
    
 
   
     The Fund's common stock  ('Common Stock') is listed  and traded on the  New
York  Stock Exchange, Inc. ('NYSE') under the symbol 'PIF.' NO ADDITIONAL SHARES
OF COMMON STOCK WILL BE ISSUED IN  CONNECTION WITH THIS OFFERING. Shares of  the
Common  Stock may be  offered pursuant to  this Prospectus from  time to time in
order to effect over-the-counter ('OTC')  secondary market sales by  PaineWebber
Incorporated   ('PaineWebber')  in  its  capacity  as  a  dealer  and  secondary
market-maker at negotiated prices related to the prevailing market prices on the
NYSE at the time of sale. The closing  price of the Common Stock on the NYSE  on
July    ,  1997 was $      per  share. See 'Trading History.'  The Fund will not
receive any proceeds from the sale of any Common Stock offered pursuant to  this
Prospectus.
    
 
     The  Fund  has  outstanding  auction  preferred  shares  ('APS')  having  a
liquidation preference  of  $150,000,000. The  APS  have resulted  in  financial
leverage  for  the Fund,  which  involves special  risks.  The Fund  may utilize
additional leverage  through  the  issuance of  additional  preferred  stock  or
through  borrowings. See  'SPECIAL LEVERAGE CONSIDERATIONS'  AND 'DESCRIPTION OF
CAPITAL STOCK.'
 
   
     Mitchell Hutchins  Asset Management  Inc. ('Mitchell  Hutchins') serves  as
investment adviser and administrator of the Fund. This Prospectus concisely sets
forth certain information an investor should know before investing and should be
retained  for future  reference. A  Statement of  Additional Information ('SAI')
dated August 1, 1997 has been filed with the Securities and Exchange  Commission
and  is incorporated by reference in its  entirety into this Prospectus. A table
of contents for the SAI is set forth  as the last section of this Prospectus.  A
copy  of the  SAI can  be obtained  without charge  by writing  to the  Fund, by
contacting your PaineWebber investment executive or PaineWebber's  correspondent
firms or by calling toll-free 1-800-852-4750.
    
 
   
                            ------------------------
THESE  SECURITIES HAVE NOT  BEEN APPROVED OR DISAPPROVED  BY THE SECURITIES AND
 EXCHANGE COMMISSION  NOR HAS  THE  COMMISSION PASSED  UPON THE  ACCURACY  OR
   ADEQUACY  OF THIS  PROSPECTUS. ANY  REPRESENTATION TO  THE CONTRARY  IS A
                               CRIMINAL OFFENSE.
    
 
                            ------------------------
                            PaineWebber Incorporated
   
                            ------------------------
                 The date of this Prospectus is August 1, 1997.
    



<PAGE>
<PAGE>
                                 FUND EXPENSES
 
     The  following tables are intended to assist investors in understanding the
various direct or indirect costs and  expenses associated with investing in  the
Fund.
 
   
<TABLE>
<S>                                                                                            <C>
SHAREHOLDER TRANSACTION EXPENSES
     Sales Load (as a percentage of offering price).........................................      None(1)
     Dividend Reinvestment Fees.............................................................      None
ANNUAL EXPENSES (AS A PERCENTAGE OF NET ASSETS ATTRIBUTABLE TO COMMON STOCK)(2)
     Investment Advisory and Administration Fees (after fee waiver).........................      0.98%
     Interest Payments on Borrowed Funds(3).................................................      0.00%
     Other Expenses.........................................................................      0.40%
                                                                                               -------
          Total Annual Expenses.............................................................      1.38%
</TABLE>
    
 
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(1) Prices  for the Common Stock traded in the OTC secondary market will reflect
    ordinary dealer mark-ups.
 
   
(2) The percentages shown reflect  all expenses expected to  be incurred by  the
    Fund  as a percentage  of only those  net assets attributable  to the Common
    Stock. If  expressed  as  a percentage  of  all  of the  Fund's  net  assets
    (regardless  of whether such assets are  attributable to the Common Stock or
    to the  APS),  such percentages  would  be lower.  Investment  advisory  and
    administration  fees are payable  to Mitchell Hutchins at  an annual rate of
    0.90% of the Fund's average weekly net assets (attributable to Common  Stock
    and the APS). During the last fiscal year, Mitchell Hutchins waived 0.25% of
    its  0.90%  investment advisory  and  administration fees.  This  fee waiver
    continues to be in effect, but  Mitchell Hutchins may discontinue it at  any
    time.  If the fee waiver were not  in effect, the Fund's Investment Advisory
    and Administration  Fees and  Total  Annual Expenses  (each expressed  as  a
    percentage of net assets attributable to Common Stock) would have been 1.36%
    and  1.76%,  respectively.  See  'Management  of  the  Fund'  for additional
    information. 'Other  Expenses'  have  been  estimated  based  upon  expenses
    actually incurred for the fiscal year ended March 31, 1997.
    
 
(3) The Fund may borrow money. See 'Special Leverage
    Considerations -- Borrowings.'
 
EXAMPLE
 
     An  investor would directly  or indirectly pay the  following expenses on a
$1,000 investment  in  the  Fund, assuming  (i)  a  5% annual  return  and  (ii)
reinvestment of all dividends and other distributions at net asset value:*
 
   
<TABLE>
<CAPTION>
ONE YEAR           THREE YEARS           FIVE YEARS           TEN YEARS
- ---------          ------------          -----------          ----------
 
<S>                <C>                   <C>                  <C>
   $14                 $43                   $75                 $164
</TABLE>
    
 
- ------------
 
   
*  After  fee waivers. If fee waivers were not in effect, the amounts that would
   be paid  by  an  investor  during the  one-year,  three-year,  five-year  and
   ten-year  periods reflected  in the  table would be  $18, $55,  $95 and $205,
   respectively.
    
                            ------------------------
     This Example  assumes  that  the percentage  amounts  listed  under  Annual
Expenses  remain the same in  the years shown (except  that Annual Expenses have
been reduced  to reflect  the completion  of organization  expense  amortization
after  five years  from the  commencement of  investment operations).  The above
tables and the assumptions in the Example of a 5% annual return and reinvestment
at net asset  value are required  by regulation of  the Securities and  Exchange
Commission  ('SEC')  applicable  to  all  closed-end  investment  companies; the
assumed 5% annual return  is not a  prediction of, and  does not represent,  the
projected  or actual performance of the  Fund's Common Stock. In addition, while
this Example assumes reinvestment  of all dividends  and other distributions  at
net  asset value, participants in the Fund's Dividend Reinvestment Plan ('Plan')
will receive shares of the  Fund's Common Stock purchased  by the Plan agent  at
the  market price in effect at  that time, which may be  at, above, or below net
asset value.
 
     THIS EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF FUTURE  EXPENSES,
AND THE FUND'S ACTUAL EXPENSES MAY BE MORE OR LESS THAN THOSE SHOWN.
 
                                       2



<PAGE>
<PAGE>
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by reference to the more
detailed information included elsewhere in this Prospectus, and in the Statement
of   Additional  Information   ('SAI').  Investors   should  carefully  consider
information set  forth  under  the heading  'Special  Risk  Considerations'  and
'Special Leverage Considerations.'
 
<TABLE>
<S>                                   <C>
The Fund............................  Insured   Municipal  Income  Fund  Inc.  (the  'Fund')  is  a  diversified,
                                        closed-end management investment company. See 'The Fund.'
The Offering........................  No additional shares of  the Fund's common stock  ('Common Stock') will  be
                                        issued  in connection with  this offering. Shares of  Common Stock may be
                                        offered pursuant to this Prospectus from time to time in order to  effect
                                        over-the-counter   ('OTC')   secondary   market   sales   by  PaineWebber
                                        Incorporated ('PaineWebber') in  its capacity as  a dealer and  secondary
                                        market-maker  at negotiated prices related to prevailing market prices on
                                        the New  York  Stock  Exchange,  Inc.  ('NYSE')  at  the  time  of  sale.
                                        PaineWebber is not obligated to conduct any such market-making activities
                                        and  may discontinue such  activities at any time  without notice, at its
                                        sole discretion. No assurance can be given as to the liquidity of, or the
                                        trading market for,  the Common Stock  as a result  of any  market-making
                                        activities  undertaken  by PaineWebber.  The Common  Stock is  listed and
                                        traded on  the  NYSE under  the  symbol  'PIF.' See  'The  Offering'  and
                                        'Trading History.'
Investment Objective and
  Policies..........................  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.  To achieve  this objective,  the Fund normally
                                        invests substantially all  of its  assets in a  diversified portfolio  of
                                        long-term Municipal Obligations that are insured as to the timely payment
                                        of  both  principal  and interest  by  an  entity that,  at  the  time of
                                        investment, has a  claims-paying ability rated  Aaa by Moody's  Investors
                                        Service,  Inc. ('Moody's'), AAA  by Standard & Poor's,  a division of The
                                        McGraw-Hill Companies, Inc.  ('S&P'), or  has an  equivalent rating  from
                                        another  nationally recognized statistical  rating organization ('NRSRO')
                                        or, with respect to 20% of the Fund's total assets, that are, at the time
                                        of investment,  (1)  backed by  an  escrow or  trust  account  containing
                                        sufficient U.S. government or U.S. government agency securities to ensure
                                        the  timely payment of  principal and interest; (2)  guaranteed as to the
                                        timely payment of principal and interest by an entity which has a  credit
                                        rating  of Aaa by Moody's, AAA by  S&P or an equivalent rating by another
                                        NRSRO; or (3) not insured, guaranteed or backed by escrows but rated  Aaa
                                        by Moody's, AAA by S&P or have an equivalent rating by another NRSRO. All
                                        or  a  portion  of  the  Fund's  assets  may  be  invested  in  Municipal
                                        Obligations the interest  on which  is an  item of  tax preference  ('Tax
                                        Preference  Item') for  purposes of  the federal  alternative minimum tax
                                        ('AMT'). No  assurance  can be  given  that  the Fund  will  achieve  its
                                        investment objective.
                                      See  'Investment  Objective and  Policies,' 'Insurance,'  'Other Investment
                                        Practices,' 'Taxes' and 'Appendix A.'
</TABLE>
 
                                       3
 

<PAGE>
<PAGE>
 
<TABLE>
<S>                                   <C>
Municipal Obligations...............  Municipal Obligations are debt obligations or similar securities issued  by
                                        or  on behalf of states (including the District of Columbia), territories
                                        or possessions  of  the  United  States  or  their  respective  political
                                        subdivisions, agencies or instrumentalities, or by multistate agencies or
                                        authorities,  the interest on  which is, in the  opinion of bond counsel,
                                        exempt from  federal income  tax. Municipal  Obligations are  issued  for
                                        various  public  purposes, including  construction of  public facilities,
                                        refinancing outstanding  obligations  and  obtaining  funds  for  general
                                        operating  expenses  and  for  loans  to  other  public  institutions and
                                        facilities. Municipal Obligations  include 'public purpose'  obligations,
                                        which generate interest that is exempt from federal income tax and is not
                                        a  Tax  Preference Item,  and  qualified 'private  activity' obligations,
                                        which generate interest that is exempt from federal income tax but may be
                                        a Tax Preference Item.  The Municipal Obligations in  which the Fund  may
                                        invest  include  municipal  bonds,  industrial  development  and  private
                                        activity bonds,  municipal lease  obligations, zero  coupon  obligations,
                                        floating  and  variable  rate  obligations,  participation  interests and
                                        custodial receipts for any of the foregoing, inverse floaters, put bonds,
                                        tender option bonds and certain municipal derivatives, such as detachable
                                        call options and  Municipal Obligations  with embedded  caps. The  market
                                        prices  of  inverse floaters  and zero  coupon  obligations will  be more
                                        volatile than those of other  types of municipal obligations and  certain
                                        Municipal Obligations, such as many forms of municipal lease obligations,
                                        may be illiquid.
                                      See  'Investment Objective and Policies,'  'Other Investment Practices' and
                                        'Appendix A.'
Insurance...........................  Insurance for  Municipal Obligations  in  which the  Fund invests  will  be
                                        obtained from insurance companies having claims-paying ability ratings of
                                        Aaa  from Moody's  or AAA  from S&P or  having an  equivalent rating from
                                        another NRSRO.  Such insurance  may be  purchased by  the issuer  of  the
                                        Municipal  Obligation or by a third party  at the time of issuance of the
                                        Municipal Obligation ('Original  Issue Insurance')  or by the  Fund or  a
                                        third  party  subsequent  to  the  original  issuance  of  the  Municipal
                                        Obligation ('Secondary  Market Insurance').  The Fund  also may  purchase
                                        insurance  covering  certain Municipal  Obligations  which it  intends to
                                        purchase  for  its  portfolio  or  which  it  already  owns   ('Portfolio
                                        Insurance'). See 'Insurance.'
Auction Preferred Shares............  The  Fund has  outstanding 800 shares  of Auction  Preferred Shares ('APS')
                                        Series A, 800 shares of APS Series B, 800 shares of APS Series C and  600
                                        shares  of  APS  Series  D,  having  an  aggregate  liquidation  value of
                                        $150,000,000. The APS have  resulted in the  financial leveraging of  the
                                        Common  Stock.  The APS  pay dividends  at rates  that are  adjusted over
                                        relatively short periods of time and that reflect prevailing  short-term,
                                        tax-exempt  interest rates.  Through this leveraging  technique, the Fund
                                        seeks to obtain  a higher  yield for  Common Stockholders  than would  be
                                        available  if the APS had not been  issued. The APS have received ratings
                                        of aaa from  Moody's and AAA  from S&P. The  Fund may utilize  additional
                                        leverage through the issuance of additional preferred
</TABLE>
 
                                       4
 

<PAGE>
<PAGE>
 
   
<TABLE>
<S>                                   <C>
                                        stock  or through borrowings and reverse repurchase agreements. There are
                                        special risks associated with leveraging, including the possibility  that
                                        changes  in the relationship of short- and long-term interest rates might
                                        cause the yield on, and  the net asset value of,  the Common Stock to  be
                                        lower than would be the case without leveraging.
                                      See 'Special Leverage Considerations' and 'Description of Capital Stock.'
Investment Adviser and
  Administrator.....................  Mitchell  Hutchins Asset  Management Inc.  ('Mitchell Hutchins'),  a wholly
                                        owned asset management  subsidiary of PaineWebber,  serves as the  Fund's
                                        investment   adviser  and   administrator.  Mitchell   Hutchins  provides
                                        investment advisory  and  portfolio  management  services  to  investment
                                        companies,   pension  funds   and  other   institutional,  corporate  and
                                        individual clients.  As investment  adviser and  administrator,  Mitchell
                                        Hutchins  is entitled to receive a fee from the Fund, computed weekly and
                                        payable monthly, in an  amount equal to  an annual rate  of 0.90% of  the
                                        Fund's  average weekly net assets. During  the last fiscal year, Mitchell
                                        Hutchins waived 0.25%  of its 0.90%  investment advisory and  administra-
                                        tion  fees.  This fee  waiver  continues to  be  in effect,  but Mitchell
                                        Hutchins may discontinue it at any time. See 'Management of the Fund.'
Dividends and Other
  Distributions.....................  The Fund declares and pays monthly cash dividends to Common Stockholders at
                                        a level rate that, on an annual  basis and after payment of dividends  on
                                        any preferred stock, results in the distribution of all of the Fund's net
                                        investment  income. The dividend rate on  the Common Stock is adjusted by
                                        the Fund's board of directors as necessary to reflect the performance  of
                                        the  Fund. The Fund intends to distribute annually to Common Stockholders
                                        substantially all of the  net capital gains realized  by the Fund to  the
                                        extent that such net capital gains are not necessary to satisfy dividend,
                                        redemption  or liquidation preferences of the  APS or any other preferred
                                        stock.
                                      For federal tax  purposes, the Fund  is required to  allocate net  realized
                                        capital  gains  and any  taxable  income (along  with  tax-exempt income)
                                        between Common Stockholders and any preferred stockholders in  proportion
                                        to  total  distributions  paid  to each  class  of  stockholders  for the
                                        relevant year. If a portion of the dividends paid on the preferred  stock
                                        is  taxable because of such allocations, the Fund may be required to make
                                        an additional dividend payment to the preferred stockholders so that  the
                                        net  after-tax  return  on the  preferred  stock  is the  same  after the
                                        additional dividend  as the  net after-tax  return that  would have  been
                                        derived  if  the initial  dividends had  qualified  in their  entirety as
                                        tax-exempt income.  Common Stockholders  are not  entitled to  comparable
                                        additional  dividends and any such payments to the preferred stockholders
                                        would reduce the net  investment income, or  capital gains available  for
                                        distribution to the Common Stockholders.
</TABLE>
    
 
                                       5
 

<PAGE>
<PAGE>
 
<TABLE>
<S>                                   <C>
                                      Dividends paid to Common Stockholders are exempt from federal income tax to
                                        the  extent such dividends  are properly designated by  the Fund as being
                                        derived from interest on tax-exempt securities. All or a portion of  such
                                        dividends may be attributable to interest income that is a Tax Preference
                                        Item.
                                      See  'Dividends and  Other Distributions;  Dividend Reinvestment  Plan' and
                                        'Taxes.'
Dividend Reinvestment Plan..........  The Fund has established a Dividend Reinvestment Plan ('Plan') under  which
                                        all  Common Stockholders whose shares are  registered in their own names,
                                        or in the  name of  PaineWebber or its  nominee, 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 or otherwise, 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. See  'Dividends and  Other
                                        Distributions; Dividend Reinvestment Plan.'
Special Risk Considerations.........  Insurance.  There  can be  no assurance  that  the insurers  whose policies
                                        insure Municipal Obligations held  by the Fund will  be able to  maintain
                                        their  Aaa, AAA or  equivalent claims-paying ability  ratings or to honor
                                        their obligations under all circumstances. The loss of such ratings or an
                                        inability to honor such  obligations would be likely  to have an  adverse
                                        effect  on  the  market value  of  the Municipal  Obligations  covered by
                                        policies issued by such insurers to the extent the Fund is not able to or
                                        does not obtain alternative insurance.  Mitchell Hutchins will engage  in
                                        an  orderly disposition of downgraded Municipal Obligations to the extent
                                        necessary to ensure  that the  Fund's holdings  of Municipal  Obligations
                                        rated below Baa by Moody's, BBB by S&P or an equivalent rating by another
                                        NRSRO do not exceed 5% of the Fund's net assets.
                                      Alternative  Minimum Tax; State and Local Taxation. The Fund may invest all
                                        or a portion of its assets in Municipal Obligations the interest on which
                                        is a Tax Preference Item. Accordingly, the Fund may not be an appropriate
                                        investment for investors who  are subject to AMT  liability or who  would
                                        become  subject to AMT liability by reason  of an investment in the Fund.
                                        All or a portion of the Fund's dividends also may be subject to state and
                                        local taxation.
                                      Market  Risk  of  Insured  Municipal  Obligations.  Although  insurance  or
                                        guarantees  on, or escrows of U.S. government securities with respect to,
                                        Municipal Obligations  reduce financial  or credit  risk, such  Municipal
                                        Obligations remain subject to market risk (i.e., the risk of fluctuations
                                        in market value as a result of changes in prevailing interest rates).
</TABLE>
 
                                       6
 

<PAGE>
<PAGE>
 
   
<TABLE>
<S>                                   <C>
                                      Illiquid  Securities. The Fund  may invest up  to 20% of  its net assets in
                                        illiquid securities. The Fund may not be able readily to dispose of  such
                                        securities  at an  amount that  approximates that  at which  the Fund has
                                        valued them and  would have  to sell  other investments  if necessary  to
                                        raise  cash to meet  its obligations. Illiquid  securities include, among
                                        other things,  municipal  lease obligations  (including  certificates  of
                                        participation)  other than those that Mitchell Hutchins has determined to
                                        be liquid  pursuant to  guidelines  established by  the Fund's  board  of
                                        directors.
                                      Rights  of Preferred Stockholders.  In the event  that dividends payable on
                                        any preferred  stock  remain  unpaid  for a  period  of  two  years,  the
                                        preferred  stockholders will, for so long as the dividends remain unpaid,
                                        be entitled to elect a majority of the Fund's board of directors. In  the
                                        event of any voluntary or involuntary liquidation, dissolution or winding
                                        up  of the Fund, the preferred stockholders will be entitled to receive a
                                        preferential liquidating distribution equal to the purchase price of  the
                                        preferred  stock  plus  any  accrued  and  unpaid  dividends  before  any
                                        distribution of assets is made to the Common Stockholders.
                                      Other Investment Risks. Certain investment practices in which the Fund  may
                                        engage would expose the Fund to additional risks. These practices include
                                        entering  into  securities  transactions  on  a  when-issued  or  delayed
                                        delivery basis,  lending portfolio  securities  and engaging  in  hedging
                                        transactions.
                                      Anti-Takeover  Provisions.  The  Fund's Articles  of  Incorporation contain
                                        provisions limiting  (1) the  ability  of other  entities or  persons  to
                                        acquire  control of the Fund, (2) the Fund's freedom to engage in certain
                                        transactions and (3) the ability of the Fund's directors or  stockholders
                                        to  amend the Articles of Incorporation. These provisions of the Articles
                                        of Incorporation  may be  regarded as  'anti-takeover' provisions.  These
                                        provisions  could have the effect of depriving the Common Stockholders of
                                        opportunities to sell their  shares at a  premium over prevailing  market
                                        prices  by discouraging a  third party from seeking  to obtain control of
                                        the Fund in a tender offer or similar transaction. The overall effect  of
                                        these  provisions is  to render  more difficult  the accomplishment  of a
                                        merger  or  the  assumption  of   control  by  a  stockholder  who   owns
                                        beneficially  more than 5%  of the Fund's  shares. They provide, however,
                                        the advantage of  potentially requiring  persons seeking  control of  the
                                        Fund  to negotiate with its management regarding the price to be paid and
                                        facilitating  the  continuity  of   the  Fund's  management,   investment
                                        objective and policies.
                                      See  'Investment  Objective and  Policies,' 'Insurance,'  'Other Investment
                                        Practices,' 'Taxes' and 'Description of Capital Stock.'
Market Price and Net Asset Value of
  Shares............................  As is common  with shares  of closed-end investment  companies, the  Fund's
                                        Common  Stock  has historically  traded at  a discount  to its  net asset
                                        value. See 'Trading History.' Whether  an investor will realize gains  or
                                        losses upon the sale of Common Stock will not
</TABLE>
    
 
                                       7
 

<PAGE>
<PAGE>
 
   
<TABLE>
<S>                                   <C>
                                        depend  directly upon  the Fund's net  asset value, but  will depend upon
                                        whether the market price of the Common Stock at the time of sale is above
                                        or below the investor's purchase price  for the shares. This market  risk
                                        is  separate and distinct from  the risk that the  Fund's net asset value
                                        may decrease. Accordingly,  the Common  Stock is  designed primarily  for
                                        long-term  investors, and investors should not view the Common Stock as a
                                        vehicle for trading purposes.
                                      See  'Trading  History,'  'Investment  Objective  and  Policies,'  'Special
                                        Leverage Considerations' and 'Description of Capital Stock.'
Special Leverage
  Considerations....................  The  APS have  resulted in leverage,  which poses special  risks for Common
                                        Stockholders, including the possibility of higher volatility of both  the
                                        net asset value and the market value of the Common Stock. Fluctuations in
                                        the  dividend rates on  the preferred stock will  affect the dividends on
                                        the Common Stock. There can be no assurance that the Fund will be able to
                                        realize a higher return on its investment portfolio than the then current
                                        dividend rate on any preferred stock.  If the then current dividend  rate
                                        on  any preferred stock were  to exceed the rate  of return on the Fund's
                                        portfolio, the Fund's leveraged capital structure would result in a lower
                                        yield to  Common  Stockholders  than  if the  Fund  were  not  leveraged.
                                        Moreover,  any decline in  the value of  the Fund's assets  will be borne
                                        entirely by Common Stockholders. Accordingly, the effect of leverage in a
                                        declining market would be  a greater decrease in  the net asset value  of
                                        the  Common  Stock than  if the  Fund  were not  leveraged, which  may be
                                        reflected in a greater decline in the market price of the Common Stock.
                                      See 'Special Leverage Considerations,' 'Taxes' and 'Description of  Capital
                                        Stock.'
</TABLE>
    
 
                                       8




<PAGE>
<PAGE>
                              FINANCIAL HIGHLIGHTS
 
   
     The  table below provides selected per share  data and ratios for one share
of Common Stock for each of the periods shown. This information is  supplemented
by  the financial statements and the  accompanying notes appearing in the Fund's
Annual Report to Shareholders  for the fiscal year  ended March 31, 1997,  which
are  incorporated by  reference into  the Fund's SAI,  which can  be obtained by
shareholders upon request. The financial statements and notes and the  financial
information  in  the  table  below  have been  audited  by  Ernst  &  Young LLP,
independent auditors, whose report thereon is  included in the Annual Report  to
Shareholders, which may be obtained without charge.
    
 
   
<TABLE>
<CAPTION>
                                                                                                     FOR THE PERIOD
                                                                        FOR THE YEARS                   JUNE 8,
                                                                       ENDED MARCH 31,                  1993`D'
                                                              ----------------------------------           TO
                                                                1997         1996         1995       MARCH 31, 1994
                                                              --------     --------     --------     --------------
<S>                                                           <C>          <C>          <C>          <C>
Net asset value, beginning of period.......................   $  14.11     $  13.42     $  13.42        $  15.00
                                                              --------     --------     --------     --------------
Net investment income......................................       1.05         1.06         1.02**          0.73
Net realized and unrealized gains (losses) from
  investments..............................................      (0.03)        0.67         0.04           (1.44)
                                                              --------     --------     --------     --------------
Net increase (decrease) from investment operations.........      (1.02)        1.73         1.06           (0.71)
                                                              --------     --------     --------     --------------
Dividends and distributions:
    From net investment income -- common stockholders......      (0.77)       (0.76)       (0.79)          (0.60)
    From net investment income -- preferred stockholders...      (0.26)       (0.28)       (0.25)          (0.13)
    In excess of net investment income -- common
      stockholders.........................................         --           --        (0.02)             --
    In excess of net investment income -- preferred
      stockholders.........................................         --           --           --`D'`D'          --
                                                              --------     --------     --------     --------------
         Total dividends and distributions to
           stockholders....................................   $  (1.03)    $  (1.04)    $  (1.06)       $  (0.73)
                                                              --------     --------     --------     --------------
                                                              --------     --------     --------     --------------
Underwriting and offering costs incurred with the preferred
  stock offering charged to common stock...................         --           --           --           (0.14)
                                                              --------     --------     --------     --------------
Net asset value, end of period.............................   $  14.10     $  14.11     $  13.42        $  13.42
                                                              --------     --------     --------     --------------
                                                              --------     --------     --------     --------------
Per share market value, end of period......................   $  12.00     $  12.13     $  11.13        $  13.00
                                                              --------     --------     --------     --------------
                                                              --------     --------     --------     --------------
Total investment return(1).................................       5.45%       16.13%       (8.17)%         (9.74)%
                                                              --------     --------     --------     --------------
                                                              --------     --------     --------     --------------
Ratios to average net assets attributable to common shares:
    Total expenses net of waivers from adviser.............       1.38%        1.33%        1.74%           1.57%*
    Total expenses before waivers from adviser.............       1.76%        1.65%        1.74%           1.57%*
    Net investment income before preferred stock
      dividends............................................       7.37%        7.45%        7.94%           5.92%*
    Preferred stock dividends..............................       1.81%        1.97%        2.02%           0.98%*
    Net investment income available to common
      stockholders.........................................       5.56%        5.48%        5.92%           4.94%*
Supplemental data:
    Net assets, end of period (000's)......................   $440,758     $441,040     $426,795        $333,825
    Portfolio turnover rate................................          0%           4%           4%              8%
    Asset coverage per share of preferred stock,
      end of period........................................   $146,919     $147,013     $142,265        $139,094
</TABLE>
    
 
   
    
 
- ------------
 
`D'  Commencement of operations
 
`D'`D' Actual amount calculates to $0.00499 per common share.
 
*  Annualized
 
** Calculated using the average share method
 
   
(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.
    
 
 
                                       9
 
 

<PAGE>
<PAGE>
     The following information relates to the  APS outstanding as of the end  of
the periods indicated. See 'Special Leverage Considerations.'
 
   
<TABLE>
<CAPTION>
                                                                                        ASSET      INVOLUNTARY
                                                                                       COVERAGE    LIQUIDATING      AVERAGE
       FISCAL                                                          TOTAL AMOUNT      PER       PREFERENCE     MARKET VALUE
        YEAR                         SENIOR SECURITIES                 OUTSTANDING*     UNIT**     PER UNIT***    PER UNIT****
- --------------------   ---------------------------------------------   ------------    --------    -----------    ------------
 
<S>                    <C>                                             <C>             <C>         <C>            <C>
1994`D'                APS Series A, B and C........................   $120,000,000    $139,094      $50,000        $ 96,654
1995`D'`D'             APS Series A, B, C and D.....................   $150,000,000    $142,265      $50,000        $ 76,554
1996                   APS Series A, B, C and D.....................   $150,000,000    $147,013      $50,000        $ 81,726
1997                   APS Series A, B, C and D.....................   $150,000,000    $146,919      $50,000        $ 81,991
</TABLE>
    
 
- ------------
 
   * Based  on liquidation value of $50,000 per share. The number of outstanding
     shares of each Series of  APS has not changed  since the Series was  issued
     and  is as follows: Series A, B and  C (each issued August 12, 1993) -- 800
     shares of  each Series;  APS Series  D (issued  November 28,  1994) --  600
     shares.
 
  ** Asset Coverage Per Unit is the same for each APS Series.
 
 *** Plus any accrued but unpaid dividends.
 
**** Average  Market  Value Per  Unit is  the same  for each  APS Series  and is
     calculated by multiplying $50,000 by  the result obtained by dividing:  (a)
     the  average monthly  market value  of the  Common Stock  during the fiscal
     year; by (b) the  average of the  amount of APS outstanding  at the end  of
     such month.
 
   `D' Reflects  the period from August 12, 1993 (date of issuance of APS Series
       A, B and C) to March 31, 1994.
 
  `D'`D' Reflects the full fiscal year for APS Series A, B and C and the  period
         from  November 28, 1994  (date of issuance)  to March 31,  1995 for APS
         Series D.
 
                                       10


<PAGE>
<PAGE>
                                    THE FUND
 
     The Fund is a diversified, closed-end management investment company and has
registered  as such under the  Investment Company Act of  1940 ('1940 Act'). The
Fund was incorporated under the  laws of the State  of Maryland on February  18,
1993, as 'PaineWebber Premier Insured Municipal Income Fund Inc.' The Fund began
doing  business under the  name 'Insured Municipal Income  Fund' in August 1995,
and shareholders approved  a change  of the  Fund's name  to 'Insured  Municipal
Income  Fund Inc.' on April 11, 1996.  The Fund's principal office is located at
1285 Avenue of the Americas, New York, New York 10019, and its telephone  number
is (212) 713-2000.
 
                                  THE OFFERING
 
     No additional shares of Common Stock will be issued in connection with this
offering.  Shares of the Common Stock may be offered pursuant to this Prospectus
from time to time in order to  effect OTC secondary market sales by  PaineWebber
in  its capacity  as a  dealer and  secondary market-maker  at negotiated prices
related to prevailing  market prices  on the  NYSE at  the time  of sale.  Costs
incurred  in  connection  with  this  offering  will  be  paid  by  PaineWebber.
PaineWebber's principal offices are located at 1285 Avenue of the Americas,  New
York,  New  York  10019.  Mitchell  Hutchins is  a  wholly  owned  subsidiary of
PaineWebber.
 
                                USE OF PROCEEDS
 
     The Fund will not receive  any proceeds from the  sale of any Common  Stock
offered  pursuant  to this  Prospectus. Proceeds  received  by PaineWebber  as a
result of its OTC secondary market sales of the Common Stock will be utilized by
PaineWebber in connection with its  secondary market operations and for  general
corporate purposes.
 
                                TRADING HISTORY
 
   
     Shares of the Common Stock, par value $.001 per share are listed and traded
on  the NYSE  under the  symbol 'PIF.'  The following  table sets  forth for the
Common Stock for each fiscal quarter within the two most recent fiscal years and
each fiscal quarter since the beginning of the current fiscal year: (a) the  per
share  high and low sales prices as reported  by the NYSE; (b) the per share net
asset values, based on the Fund's computation  as of 4:00 p.m. on the last  NYSE
business  day for the  week corresponding to  the dates on  which the respective
high and low sales prices were recorded; and (c) the discount or premium to  net
asset value represented by the high and low sales prices shown. THE RANGE OF NET
ASSET  VALUES  AND/OR PREMIUMS  AND DISCOUNTS  FOR THE  COMMON STOCK  DURING THE
PERIODS SHOWN MAY BE BROADER THAN IS SHOWN ON THIS TABLE. On July   , 1997,  the
closing  price per share of Common Stock on the NYSE  was $     , the Fund's net
asset value per share was $      and the  discount to net asset value per  share
was (     )%.
    
 
   
<TABLE>
<CAPTION>
                                                                                                  (DISCOUNT) OR
                                                                                                  PREMIUM TO NET
                                                         SALES PRICES       NET ASSET VALUES       ASSET VALUE
                                                      ------------------    ----------------    ------------------
                   QUARTER ENDED                       HIGH        LOW       HIGH      LOW       HIGH        LOW
- ---------------------------------------------------   -------    -------    ------    ------    -------    -------
<S>                                                   <C>        <C>        <C>       <C>       <C>        <C>
6/30/95............................................   $12.000    $10.875    $14.32    $13.25     (16.20)%   (17.89)%
9/30/95............................................    11.875     11.125     14.08     13.35     (15.63)    (16.63)
12/31/95...........................................    12.625     11.500     14.87     14.10     (15.06)    (18.44)
3/31/96............................................    12.875     11.875     15.10     14.23     (14.70)    (16.51)
6/30/96............................................    12.125     11.250     14.11     13.61     (14.03)    (17.34)
9/30/96............................................    12.250     11.500     14.58     14.00     (15.98)    (17.86)
12/31/96...........................................    12.500     11.875     14.78     14.61     (15.43)    (18.72)
3/31/97............................................    12.500     11.875     14.78     14.61     (15.43)    (18.72)
6/30/97............................................
</TABLE>
    
 
     The  Common Stock has historically traded in the market at prices below net
asset value. See 'Description of Capital  Stock -- Common Stock Repurchases  and
Tender Offers' and ' -- Conversion to Open-End Investment Company' as to methods
that may be undertaken by the Fund to reduce any discount.
 
                                       11
 

<PAGE>
<PAGE>
                       INVESTMENT OBJECTIVE AND POLICIES
 
     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. To achieve this objective,  the Fund normally invests substantially
all of its assets in a diversified portfolio of long-term Municipal  Obligations
that  are insured as to the timely payment  of both principal and interest by an
entity that, at the time of investment, has a claims-paying ability rated Aaa by
Moody's, AAA by S&P or an equivalent rating by another NRSRO or, with respect to
20% of the Fund's total assets, that are, at the time of investment, (1)  backed
by  an escrow  or trust  account containing  sufficient U.S.  government or U.S.
government agency  securities to  ensure  the timely  payment of  principal  and
interest;  (2) guaranteed as to  timely payment of principal  and interest by an
entity which has a credit rating of Aaa by Moody's, AAA by S&P or an  equivalent
rating by another NRSRO; or (3) not insured, guaranteed or backed by escrows but
rated  Aaa by Moody's, AAA by S&P or  an equivalent rating by another NRSRO. All
the Municipal Obligations described above will have, at the time of  investment,
ratings  of Aaa from  Moody's, AAA from  S&P or equivalent  ratings from another
NRSRO or, with respect to the  Municipal Obligations described in (1) above,  if
unrated,  will have  been determined  by Mitchell  Hutchins to  be of comparable
quality to Municipal Obligations that  have received such ratings. In  addition,
the  Fund under normal circumstances invests at least 65% of its total assets in
income-producing securities.  'Long-term'  as  used  in  this  Prospectus  means
Municipal Obligations with maturities in excess of 10 years. No assurance can be
given that the Fund will achieve its investment objective.
 
   
     Municipal  Obligations are debt obligations or similar securities issued by
or on behalf  of states  (including the  District of  Columbia), territories  or
possessions  of the  United States  or their  respective political subdivisions,
agencies or instrumentalities,  or by  multistate agencies  or authorities,  the
interest  on  which is,  in the  opinion  of bond  counsel, exempt  from regular
federal  income  tax.  Municipal  Obligations  are  issued  for  various  public
purposes,  including  construction  of  public  facilities,  such  as  airports,
bridges, hospitals, housing, mass transportation, schools, streets and water and
sewer works. Other public purposes for which Municipal Obligations may be issued
include refinancing  outstanding obligations  and  obtaining funds  for  general
operating  expenses and for  loans to other  public institutions and facilities.
Municipal Obligations  include  'public  purpose'  obligations,  which  generate
interest  that is  exempt from federal  income tax  and is not  a Tax Preference
Item, and qualified 'private activity' obligations, which generate interest that
is exempt from federal income tax but that, if the obligations were issued after
August 7, 1986, is a Tax Preference Item. The types of Municipal Obligations  in
which  the Fund may invest are described in Appendix A to this Prospectus and in
the SAI.
    
 
   
     The Fund may invest 25% or more of its total assets in a particular segment
of the  Municipal  Obligations market,  such  as hospital,  housing  or  airport
revenue  bonds, or in securities the interest  on which is paid from revenues on
similar types  of projects,  if  Mitchell Hutchins  determines that  the  yields
available from obligations in that market segment justify the potential increase
in  risk resulting from a large investment in that market segment. Although such
obligations might be  supported by  the credit  of governmental  entities or  by
non-governmental  entities from a  number of different  industries, an economic,
business, political or  other change  affecting one such  obligation might  also
affect other obligations in the same market segment.
    
 
     The  yield  on a  Municipal  Obligation depends  on  a variety  of factors,
including general  municipal and  fixed-income security  market conditions,  the
financial  condition of  the issuer,  the size  of the  particular offering, the
maturity, credit  quality and  rating of  the issue  and expectations  regarding
changes  in income tax rates. Generally, the  longer the maturity of a Municipal
Obligation, the higher  the yield  and the  greater the  volatility. The  market
value  of Municipal  Obligations, and  accordingly the  Fund's net  asset value,
normally varies inversely with  changes in interest rates.  Such changes in  the
values  of Municipal Obligations held  by the Fund will  not affect the interest
income derived from them but  will affect the net asset  value of shares of  the
Common Stock.
 
     Certain  Municipal Obligations  held by the  Fund may permit  the issuer to
call or redeem the obligations, in whole or in part, at its option. If an issuer
were to redeem Municipal Obligations held by the Fund during a time of declining
interest rates, the Fund might realize capital gains or losses at a time that it
would not  otherwise do  so, and  the Fund  might not  be able  to reinvest  the
proceeds of the
 
                                       12
 

<PAGE>
<PAGE>
redemption  in Municipal Obligations providing as high  a level of income as the
obligations that were redeemed.
 
     Opinions relating  to the  validity  of Municipal  Obligations and  to  the
exemption   of  interest  thereon  from  federal  income  tax  (and  also,  when
applicable, from  treatment as  a  Tax Preference  Item)  are rendered  by  bond
counsel  to the issuer  at the time  of issuance. Neither  the Fund nor Mitchell
Hutchins will  review the  proceedings  relating to  the issuance  of  Municipal
Obligations  or the basis  for such opinions. Further,  federal, state and local
laws may be enacted that adversely  affect the tax-exempt status of interest  on
Municipal Obligations or of the exempt-interest dividends received by the Fund's
stockholders   or  that  impose  other  constraints  upon  enforcement  of  such
obligations. It  is also  possible that,  as  a result  of litigation  or  other
conditions,  the power or ability  of issuers to meet  their obligations for the
payment of  principal of  and interest  on their  Municipal Obligations  may  be
materially and adversely affected.
 
     The Fund may invest all or a portion of its assets in Municipal Obligations
the interest on which is a Tax Preference Item. Accordingly, stockholders may be
required  to include a portion of the  Fund's dividends in calculating their AMT
liability. Corporations that hold Common Stock must include the entire amount of
any  exempt-interest  dividends  (including  any  portion  that  is  not  a  Tax
Preference  Item) in calculating their adjusted current earnings for purposes of
the AMT. The Fund  may not be  an appropriate investment  for investors who  are
subject  to AMT liability or who would become subject to AMT liability by reason
of an investment in the Fund. All or a portion of the Fund's dividends also  may
be subject to state and local taxation. See 'Taxes.'
 
     Generally,  Municipal  Obligations  which  are covered  by  insurance  or a
guarantee would not be rated  Aaa or AAA, and might  not be considered to be  of
investment  grade credit quality in the  absence of such insurance or guarantee.
Although insurance or guarantees  on, or escrows  of U.S. government  securities
with  respect to,  Municipal Obligations  reduce financial  or credit  risk with
respect to those Municipal Obligations (i.e., the possibility that owners of the
insured Municipal  Obligations will  not receive  timely scheduled  payments  of
principal   or  interest),  insured,  guaranteed  and  escrow  backed  Municipal
Obligations remain subject to market risk (i.e., fluctuations in market value as
a result of  changes in  prevailing interest rates).  Accordingly, insurance  or
guarantees  on, or escrow backing with  respect to, Municipal Obligations do not
ensure the market  value of  the Fund's  assets or the  net asset  value or  the
market price for the Common Stock.
 
     The   Fund's  investment  objective   and  certain  investment  limitations
described in the SAI  are fundamental policies that  may not be changed  without
shareholder  approval. In addition,  the Fund's policy  of normally investing at
least 80%  of its  total assets  in  insured Municipal  Obligations may  not  be
changed  without  shareholder approval.  All  other investment  policies  may be
changed by the Fund's board of directors without shareholder approval. The  Fund
does  not consider custodial receipts to  be Municipal Obligations in connection
with the foregoing 80%  policy, unless such custodial  receipts are of the  type
utilized   in  order  to  provide   Secondary  Market  Insurance  for  Municipal
Obligations.
 
                                   INSURANCE
 
     Each insured Municipal Obligation in which the Fund invests will be covered
by Original Issue Insurance, Secondary Market Insurance or Portfolio  Insurance.
Original  Issue Insurance  is purchased  with respect  to a  particular issue of
Municipal Obligations by the issuer thereof or a third party in conjunction with
the original issue of such Municipal Obligations. Secondary Market Insurance  is
purchased  by  the Fund  or a  third party  subsequent to  the time  of original
issuance of a Municipal Obligation. Both Original Issue Insurance and  Secondary
Market  Insurance remain in effect as  long as the Municipal Obligations covered
thereby remain outstanding and  the insurer remains  in business, regardless  of
whether  the Fund ultimately  disposes of such  Municipal Obligations. Portfolio
Insurance may be  purchased by the  Fund with respect  to Municipal  Obligations
which the Fund intends to purchase or already owns and would generally terminate
when  the  Municipal  Obligation is  sold  by  the Fund  or  redeemed.  The Fund
currently  intends  to  emphasize  investments  in  Municipal  Obligations  with
Original  Issue Insurance or Secondary Market  Insurance. There is no limitation
on the  percentage  of the  Fund's  assets that  may  be invested  in  Municipal
Obligations insured by any given insurer.
 
                                       13
 

<PAGE>
<PAGE>
     Original   Issue  Insurance,  Secondary   Market  Insurance  and  Portfolio
Insurance generally do not insure payment  on an accelerated basis, the  payment
of  any redemption premium  (except with respect to  certain premium payments in
the case of  certain small  issue industrial development  and pollution  control
Municipal  Obligations), the value  of the Common  Stock or the  market value of
Municipal Obligations, or payments of any tender purchase price upon the  tender
of  the  Municipal  Obligations. Such  insurance  also does  not  insure against
nonpayment of principal of or  interest on Municipal Obligations resulting  from
the  insolvency, negligence or any other act or omission of the trustee or other
paying agent for such obligations.
 
     The Fund's policy of investing in Municipal Obligations insured by insurers
whose claims-paying  ability  is  rated  Aaa  by Moody's,  AAA  by  S&P  or  the
equivalent by another NRSRO applies only at the time of the Fund's investment in
a  Municipal Obligation. A subsequent downgrade by Moody's, S&P or another NRSRO
of an insurer's claims-paying ability would result in a downgrade of the  rating
assigned  to the  Municipal Obligations  insured by  such insurer,  although the
Municipal Obligations may have an independent rating that is higher than the new
rating assigned to  the insurer's  claims-paying ability.  The securities  could
experience  a decrease in market  price as a result of  such a downgrade. In the
event the  ratings  assigned to  such  Municipal Obligations  decline  to  below
investment  grade, such Municipal Obligations  would probably become less liquid
or even illiquid. Mitchell Hutchins will consider a downgrade by Moody's, S&P or
another NRSRO  of  the  claims-paying  ability  of  an  insurer  or  the  credit
characteristics  of a particular  issuer in determining  whether the Fund should
continue to  hold  a  Municipal  Obligation. In  making  such  a  determination,
Mitchell  Hutchins also will consider such factors as the rating assigned to the
Municipal Obligation independent of the insurance, its assessment of the  credit
quality  of the issuer  of the Municipal  Obligation and the  price at which the
Municipal Obligation could be sold. Mitchell Hutchins will engage in an  orderly
disposition  of  downgraded Municipal  Obligations  to the  extent  necessary to
ensure that the  Fund's holdings  of Municipal  Obligations rated  below Baa  by
Moody's, BBB by S&P or an equivalent rating by another NRSRO do not exceed 5% of
the Fund's net assets. Municipal Obligations rated Baa by Moody's are investment
grade but Moody's considers them to have speculative characteristics. Changes in
economic conditions or other circumstances are more likely to lead to a weakened
capacity  for Municipal  Obligations that  are rated  Baa or  BBB (or equivalent
ratings) to make  principal and interest  payments than is  the case for  higher
grade Municipal Obligations.
 
     Although  Mitchell Hutchins periodically reviews the financial condition of
each insurer, there can be no assurance that the insurers will be able to  honor
their  obligations in all circumstances. In the event of a default by an insurer
on its  obligations with  respect to  any Municipal  Obligations in  the  Fund's
portfolio,  the  Fund would  look to  the  issuer or  guarantor of  the relevant
Municipal Obligations for payments of principal and interest and such issuer  or
any guarantor may not be rated Aaa, AAA or the equivalent. Accordingly, the Fund
could  be exposed  to greater  risk of  non-payment in  such circumstances which
could adversely affect the Fund's net asset value and the market price per share
of the Common  Stock. Alternatively,  the Fund could  elect to  dispose of  such
Municipal Obligations; however, the market prices for such Municipal Obligations
may  be lower than the Fund's purchase price for them and the Fund could sustain
a capital loss as a result.
 
                           OTHER INVESTMENT PRACTICES
 
     Certain of the other investment practices in which the Fund may engage  and
that  are described  below may  give rise  to federal  income tax.  Under normal
circumstances, the  Fund does  not intend  to  engage in  those practices  to  a
significant  extent. The Fund's ability to engage in certain of these investment
practices is also limited by the rating agency guidelines applicable to the APS.
See 'Special Leverage Considerations' below and Appendix B to the SAI.
 
WHEN-ISSUED AND DELAYED DELIVERY SECURITIES
 
     The Fund may purchase Municipal Obligations on a when-issued basis, or  may
purchase  or sell Municipal Obligations for  delayed delivery. In when-issued or
delayed delivery transactions, delivery of  the securities occurs beyond  normal
settlement periods, but no payment or delivery will be made by the Fund prior to
the  actual delivery or payment by the  other party to the transaction. The Fund
will not
 
                                       14
 

<PAGE>
<PAGE>
accrue income with respect to a  when-issued or delayed delivery security  prior
to its stated delivery date. When the Fund purchases securities on a when-issued
or  delayed  delivery  basis,  however,  it  immediately  assumes  the  risks of
ownership,  including  the  risk  of  price  fluctuation.  Depending  on  market
conditions,  the Fund's  when-issued and  delayed delivery  purchase commitments
could cause its net asset value per share (and thus its market value per  share)
to  be more volatile, because  such securities may increase  the amount by which
the Fund's total assets, including the value of when-issued and delayed delivery
securities held by the  Fund, exceed its  net assets. Failure  by the issuer  to
deliver  a security  purchased on  a when-issued  or delayed  delivery basis may
result in a loss or missed opportunity to make an alternative investment.
 
SHORT-TERM TAX-EXEMPT AND TAXABLE INVESTMENTS
 
     The Fund  normally invests  substantially all  of its  assets in  long-term
Municipal Obligations. However, in order to invest cash reserves or when, in the
opinion  of Mitchell Hutchins,  no suitable long-term  Municipal Obligations are
available, the Fund may  invest up to  20% of its total  assets in high  quality
short-term  Municipal Obligations that are rated,  at the time of investment, no
lower than MIG-2 by Moody's, SP-2 by S&P or the equivalent by another NRSRO  or,
if unrated, that are determined by Mitchell Hutchins to be of comparable quality
to Municipal Obligations that are rated at least MIG-2 or SP-2. These short-term
Municipal  Obligations may  include variable or  floating rate  demand notes and
similar  instruments  that  trade  as  short-term  obligations.  For   temporary
defensive  purposes,  the  Fund  may invest  without  limit  in  such short-term
Municipal Obligations.
 
     In addition, if in the opinion of Mitchell Hutchins no suitable  short-term
Municipal  Obligations are  available, the Fund  temporarily may  hold cash and,
with respect to up to  20% of its total assets,  invest in taxable money  market
instruments,  including:  (1)  U.S.  government  securities;  (2)  high  quality
commercial paper that is rated, at the  time of purchase, no lower than  Prime-2
by Moody's or A-2 by S&P or, if unrated, that is determined by Mitchell Hutchins
to  be of comparable quality to commercial  paper that is rated at least Prime-2
or A-2; (3) bank obligations  (including certificates of deposit, time  deposits
and  bankers' acceptances of domestic banks); and (4) repurchase agreements with
respect to any of the foregoing.  Interest earned from such taxable  investments
will be taxable to stockholders as ordinary income when distributed. If the Fund
were  to hold cash, the cash would not earn interest, and the Fund's yield would
be lower than if the cash  had been invested. For temporary defensive  purposes,
the Fund may invest without limit in such taxable money market instruments.
 
HEDGING AND RELATED INCOME STRATEGIES
 
     The  Fund may use  options (both exchange-traded  and over-the-counter) and
futures contracts to attempt to enhance income and to reduce the overall risk of
its investments  (hedge).  These  strategies may  generate  taxable  income.  In
addition,  new financial products and risk  management techniques continue to be
developed and may be used if consistent with the Fund's investment objective and
policies. The Fund's ability  to use these strategies  may be limited by  market
conditions,  regulatory  limits and  tax considerations  and  is limited  by the
rating agency guidelines applicable  to the APS. The  Fund would only engage  in
these strategies if doing so would not adversely affect the rating of the APS by
Moody's  and S&P. The use of options and futures solely to enhance income may be
considered a form of  speculation. The Statement  of Additional Information  for
the Fund contains further information on these strategies.
 
     The  Fund  might  not use  any  hedging  strategies, and  there  can  be no
assurance that any strategy used will succeed. If Mitchell Hutchins is incorrect
in its judgment on  market values, interest rates  or other economic factors  in
using  a hedging strategy, the Fund may have  lower net income and a net loss on
the investment. Each of these strategies involves certain risks, which include:
 
           the fact  that  the skills  needed  to use  hedging  instruments  are
           different from those needed to select securities for the Fund;
 
           the  possibility of  imperfect correlation,  or even  no correlation,
           between price movements of hedging instruments and price movements of
           the securities being hedged;
 
                                       15
 

<PAGE>
<PAGE>
           possible constraints placed on the Fund's ability to purchase or sell
           portfolio investments at advantageous times  due to the need for  the
           Fund to maintain 'cover' or to segregate securities; and
 
           the possibility that the Fund is unable to close out or liquidate its
           hedged position.
 
LENDING OF PORTFOLIO SECURITIES
 
   
     To  attempt to enhance income (which would  be taxable income), the Fund is
authorized to lend portfolio  securities with a  value of up to  33 1/3% of  its
total assets to broker-dealers or institutional investors that Mitchell Hutchins
deems  qualified, but only if doing so  would not adversely affect the rating of
the APS by Moody's and S&P and only when the borrower maintains with the  Fund's
custodian  acceptable collateral, in an amount, marked to market daily, at least
equal to the market  value of the securities  loaned, plus accrued interest  and
dividends.  Acceptable collateral is limited to cash, U.S. government securities
and irrevocable letters of  credit that meet  certain guidelines established  by
Mitchell  Hutchins. In  determining whether to  lend securities  to a particular
broker-dealer or institutional  investor, Mitchell Hutchins  will consider,  and
during   the  period  of   the  loan  will  monitor,   all  relevant  facts  and
circumstances, including the  creditworthiness of  the borrower.  The Fund  will
retain authority to terminate any loans at any time. The Fund may pay reasonable
fees  in connection with a loan and may pay a negotiated portion of the interest
earned on the cash  held as collateral  to the borrower  or placing broker.  The
Fund  will  receive reasonable  interest  on the  loan or  a  flat fee  from the
borrower  and  amounts   equivalent  to   any  dividends,   interest  or   other
distributions on the securities loaned. The Fund will regain record ownership of
loaned securities to exercise beneficial rights, such as voting and subscription
rights, when regaining such rights is considered to be in the Fund's interest.
    
 
OTHER PRACTICES
 
     The Fund may invest up to 20% of its net assets in illiquid securities. The
term  'illiquid securities'  for this  purpose means  securities that  cannot be
disposed  of  within  seven  days  in   the  ordinary  course  of  business   at
approximately  the  amount  at which  the  Fund  has valued  the  securities and
includes, among other things, securities subject to contractual restrictions  on
resale,  repurchase agreements  maturing in more  than seven  days and municipal
lease obligations  (including certificates  of participation)  other than  those
that  Mitchell  Hutchins  has  determined  are  liquid  pursuant  to  guidelines
established by  the  board of  directors.  To the  extent  the Fund  invests  in
illiquid  securities,  the  Fund  may  not be  able  to  readily  liquidate such
investments, and would have to sell other investments if necessary to raise cash
to meet its  obligations. The  lack of a  liquid secondary  market for  illiquid
securities  may make it more  difficult for the Fund to  assign a value to those
securities for purposes of valuing the Fund's portfolio and calculating its  net
asset  value. The Fund also  may invest in stand-by  commitments with respect to
Municipal Obligations it purchases or holds. The Fund may engage in  short-sales
'against the box.'
 
                        SPECIAL LEVERAGE CONSIDERATIONS
 
PREFERRED STOCK
 
     On  August 12, 1993, the Fund issued 800 shares of APS Series A, 800 shares
of APS Series B and 800 shares of APS Series C, having an aggregate  liquidation
preference of $120,000,000. The net proceeds to the Fund of the sale of the APS,
after   deduction  of   underwriting  discounts   and  offering   expenses,  was
$117,667,500. On November 28,  1994, in connection with  the acquisition by  the
Fund  of the assets and liabilities of PaineWebber Premier Intermediate Tax-Free
Income Fund  Inc.,  the Fund  issued  600 shares  of  APS Series  D,  having  an
aggregate liquidation preference of $30,000,000. The Fund has the right to issue
addditional  APS or other preferred stock  to the maximum extent permitted under
the 1940 Act.
 
     The APS have  resulted (and  any issuance  of other  preferred stock  would
result)  in the financial leveraging of the Common Stock. The use of leverage is
a speculative  investment technique  and involves  special risks  to the  Common
Stockholders. These include the possibility of higher volatility of both the net
asset  value and the market value of the Common Stock. Also, fluctuations in the
dividend
 
                                       16
 

<PAGE>
<PAGE>
rate on the APS will  affect the dividends on the  Common Stock. So long as  the
Fund  is able to realize a higher net rate of return on its investment portfolio
than the then current dividend rate on the APS (or on any other preferred  stock
issued  by the  Fund) together  with other related  expenses, the  effect of the
leverage will be  to cause  Common Stockholders  to realize  higher current  net
investment  income  than  if  the  Fund were  not  leveraged.  There  can  be no
assurance, however, that the Fund will be  able to realize a higher net  return.
To  the extent that the then current dividend rate on the APS approaches the net
return on the  Fund's investment portfolio,  the benefit of  leverage to  Common
Stockholders  will be reduced, and if the  then current dividend rate on the APS
were to exceed  the net  return on the  Fund's portfolio,  the Fund's  leveraged
capital  structure would result in a lower  yield to Common Stockholders than if
the Fund were not leveraged.
 
   
     Each Series of APS pays dividends at rates that normally are tax-exempt and
that are adjusted  to market  based on an  auction process.  Rates normally  are
adjusted  every 7 days  on APS Series  A, every 28  days on APS  Series B, every
three months on APS Series C and every 7  days on APS Series D. As of March  31,
1997,  the dividend rate payable  on APS Series A  was 3.685%, the dividend rate
payable on APS Series B  was 3.505%, the dividend rate  payable on APS Series  C
was  3.495%, and the dividend rate payable on  APS Series D was 3.417%. Based on
those  dividend  rates,  the  Fund  must  experience  a  net  annual  return  of
approximately  1.20% in order to cover the  annual dividend payments on the APS.
There can be no assurance  that the Fund will continue  to realize a higher  net
rate  of return on its investment portfolio  than the dividend rate that must be
paid on the APS.  The following table may  assist the investor in  understanding
the  effects of leverage by  illustrating the effect of  leverage on return to a
Common Stockholder.  The figures  appearing in  the table  are hypothetical  and
actual returns may be greater or less than those appearing in the table.
    
   
<TABLE>
<S>                                                <C>            <C>            <C>           <C>          <C>
Assumed Return on Portfolio
  (Net of Expenses)............................        - 10%          - 5%             0%          5%          10%
Corresponding Return to Common
  Stockholder..................................     - 16.98%       - 9.40%        - 1.82%       5.76%       13.34% 
 
</TABLE>
    
 
     Any  decline in the net asset value of the Fund's investments will be borne
entirely by  Common  Stockholders. Accordingly,  the  effect of  leverage  in  a
declining  market would  be a  greater decrease  in the  net asset  value of the
Common Stock than if the Fund were not leveraged and could adversely affect  the
Fund's  ability to make dividend payments on its Common Stock. Any such decrease
may be reflected in a greater decline  in the market price of the Common  Stock.
If  the Fund's  current investment income  were not sufficient  to meet dividend
requirements on the  APS, it could  become necessary for  the Fund to  liquidate
certain  of its investments, thereby reducing net assets and, therefore, the net
asset value of the Common Stock. Such liquidations would cause the Fund to incur
transaction costs and might also cause  the Fund to realize gains on  securities
held  for less than three months. Because, under current tax laws, the Fund must
derive less  than  30%  of its  annual  gross  income from  the  sale  or  other
disposition  of stocks or  other securities held  for less than  three months to
maintain its status as a  regulated investment company ('RIC'), such  securities
gains would limit the ability of the Fund to sell other securities held for less
than  three months  that it  might wish to  sell in  the ordinary  course of its
portfolio management and thus might adversely affect its yield. Moreover,  while
dividends  on the APS, which  are cumulative, are unpaid,  no dividends or other
distributions would  be permitted  to be  paid on  Common Stock  until the  Fund
resumed its payments of dividends on the APS as required.
 
     Under  the  1940  Act, the  value  of  the Fund's  total  assets,  less all
liabilities and indebtedness not deemed to  be senior securities under the  1940
Act,  must be at least  equal to 200% of the  aggregate liquidation value of the
preferred  stock  (plus  any  outstanding  indebtedness  deemed  to  be   senior
securities)  at  any time  that  the Fund  pays a  dividend  or makes  any other
distribution on Common Stock (other than a distribution payable in Common Stock)
or any time the Fund repurchases Common Stock, in each case after giving  effect
to  such dividend, distribution or repurchase. This requirement could impair the
ability of the  Fund to  maintain its  qualification as  a RIC  for federal  tax
purposes.  To  the extent  necessary,  the Fund  intends  to purchase  or redeem
preferred stock in order to maintain asset coverage at the required 200%  level.
In  such circumstances, the  Fund may have to  liquidate portfolio securities in
order to meet redemption  requirements. This could have  the effect of  reducing
the  Fund's future net income.  Such liquidations would cause  the Fund to incur
related transaction costs. In addition, such liquidations might require the Fund
to   realize    capital    gains    or    losses   at    a    time    that    it
 
                                       17
 

<PAGE>
<PAGE>
would  not otherwise and might limit the ability of the Fund to dispose of other
securities that  it might  wish to  sell  in the  ordinary course  of  portfolio
management,  and thus might adversely affect  the Fund's yield. Such redemptions
could also require the  Fund to pay redemption  premiums, which would  adversely
affect the Common Stockholders.
 
     The  APS have received  ratings of aaa  from Moody's and  AAA from S&P. The
rating agencies have  established guidelines and  other requirements with  which
the  Fund has agreed  to comply for so  long as the APS  are outstanding and are
rated by Moody's and S&P. The rating agencies' portfolio guidelines establish  a
set  of tests for portfolio composition  and asset coverage that supplement (and
in some cases are more restrictive  than) the applicable requirements under  the
1940  Act and  the Fund's  investment policies.  These guidelines  include asset
coverage requirements which are more restrictive than those under the 1940  Act,
restrictions   on  certain  portfolio   investments  and  investment  practices,
requirements that the Fund maintain a  portion of its assets in short-term  high
quality  fixed-income securities and  certain mandatory redemption requirements.
The  rating  agency  requirements  also  impose  certain  minimum  issue   size,
geographic  diversification  and  other requirements  for  determining portfolio
assets that  are eligible  for computing  compliance with  their asset  coverage
requirements.  The  ability  of the  Fund  to  comply with  such  asset coverage
maintenance ratios may be subject to circumstances which are beyond the  control
of  the Fund, such as market conditions  for its portfolio securities. The terms
of the APS  prohibit the  payment of dividends  or distributions  on the  Common
Stock in the event the Fund fails to meet such asset coverage maintenance ratios
and,  in such circumstances,  also provide for mandatory  redemption of the APS,
with the potential adverse effects  discussed above. For additional  information
concerning rating agency guidelines and restrictions, see Appendix B to the SAI.
 
     In accordance with the 1940 Act, the holders of the APS have special voting
rights,  including the right to  elect at least two  directors at all times. See
'Description of Capital Stock -- Auction Preferred Shares -- Voting Rights.'
 
     The issuance of the  APS has entailed certain  costs and expenses, such  as
underwriting  discounts, fees associated  with the registration  of the APS with
the SEC, filings  under state  securities laws,  rating agency  fees, legal  and
accounting fees, printing costs, and will entail certain other ongoing expenses,
such  as administrative and accounting fees.  These costs and expenses have been
or will be borne  by the Fund. The  initial costs and expenses  of the APS  have
been  reflected  as a  reduction in  the net  asset value  of the  Common Stock.
Ongoing expenses associated with the APS will be reflected as a reduction in the
investment income that otherwise would  be available for distribution to  Common
Stockholders.
 
     The Fund does not expect to realize significant taxable income. For federal
tax  purposes, however, net realized capital  gains and other taxable income, if
any,  will  be   allocated  (along  with   tax-exempt  income)  between   Common
Stockholders  and the  holders of the  APS in proportion  to total distributions
paid to each class of stockholders for  the year in which such capital gains  or
other  taxable income is realized or earned. The holders of the APS are entitled
to receive  dividends  on  a  cumulative basis  before  any  dividend  or  other
distribution  may be paid to Common Stockholders. Moreover, the terms of the APS
require that, if any portion of a dividend or other distribution to the  holders
of the APS is taxable, the Fund must pay an additional dividend on the APS in an
amount such that the net after-tax return on the APS will be the same as the net
after-tax  return that would have been derived  if the initial dividends paid to
the holders of the APS had qualified in their entirety as tax-exempt income. Any
such additional  dividends  paid to  holders  of the  APS  will reduce  the  net
investment income of the Fund available for distribution to Common Stockholders.
 
BORROWINGS
 
     The  Fund is permitted to borrow  money to finance Common Stock repurchases
and tender offers or  for investment purposes from  banks and other entities  or
through  reverse repurchase agreements in an amount  not in excess of 33 1/3% of
total assets  (including  the amount  of  the  borrowing and  any  other  senior
securities  representing indebtedness issued, but reduced by any liabilities and
indebtedness not constituting  senior securities). Borrowing  by the Fund  would
create leverage and would entail speculative factors similar to those applicable
to  the issuance of preferred stock. If  borrowings are made on a secured basis,
the custodian will segregate the pledged assets for the benefit of the lender or
arrangements will be made  with a suitable subcustodian,  which may include  the
lender. The Fund has no
 
                                       18
 

<PAGE>
<PAGE>
current  intention of borrowing money for  investment purposes during the coming
year. See 'Description of Capital Stock  -- Common Stock Repurchases and  Tender
Offers.'
 
                             MANAGEMENT OF THE FUND
 
   
     Subject  to the  supervision of the  Fund's board  of directors, investment
advisory and administration services  will be provided to  the Fund by  Mitchell
Hutchins  pursuant to an  Investment Advisory and  Administration Contract dated
May 26,  1993  ('Advisory  Contract').  Mitchell  Hutchins'  principal  business
address  is 1285  Avenue of  the Americas,  New York,  New York  10019. Mitchell
Hutchins is a wholly  owned subsidiary of PaineWebber,  which is a wholly  owned
subsidiary  of  Paine  Webber Group  Inc.,  a publicly  held  financial services
holding company. Mitchell  Hutchins provides investment  advisory and  portfolio
management   services  to   investment  companies,   pension  funds   and  other
institutional, corporate and  individual clients.  As of April  30, 1997,  total
assets  under Mitchell  Hutchins' management  exceeded $43  billion. As  of that
date, Mitchell  Hutchins  served as  investment  adviser or  sub-adviser  to  30
registered  investment companies  with 65  separate portfolios  having aggregate
assets of approximately $32.3 billion.
    
 
   
     Pursuant to the Advisory Contract, Mitchell Hutchins provides a  continuous
investment program for the Fund and makes investment decisions and places orders
to  buy, sell or  hold particular securities;  Mitchell Hutchins also supervises
all matters relating to the operation of  the Fund and obtains for it  corporate
officers,  clerical staff, office space, equipment and services. As compensation
for its  services, Mitchell  Hutchins is  entitled to  receive a  fee,  computed
weekly  and paid monthly, in an amount equal  to the annual rate of 0.90% of the
Fund's average weekly net assets. During the last fiscal year, Mitchell Hutchins
waived 0.25%  of its  investment advisory  and administration  fees. This  waver
continues to be in effect, but Mitchell Hutchins may discontinue it at any time.
    
 
   
     The  Fund incurs various other expenses  in its operations, such as custody
and transfer agency fees, brokerage commissions, professional fees, expenses  of
board  and shareholder meetings,  fees and expenses  relating to registration of
its Common  Stock,  taxes  and  governmental fees,  fees  and  expenses  of  the
directors,  costs of obtaining insurance,  expenses of printing and distributing
shareholder materials, organizational expenses, including costs or losses to any
litigation. For the fiscal years ended March 31, 1997, March 31, 1996, and March
31, 1995,  the Fund's  total expenses,  stated as  a percentage  of average  net
assets attributable to Common Stock, were 1.76% (1.38% after fee waivers), 1.65%
(1.33% after fee waivers) and 1.74%, respectively.
    
 
   
     Elbridge  (Ebby)  T.  Gerry  III and  Richard  S.  Murphy  are co-portfolio
managers of the Fund. Mr. Gerry, a senior vice president and a portfolio manager
of Mitchell Hutchins, has been responsible for the day-to-day management of  the
Fund's  portfolio  since  January  1996.  Mr.  Gerry  has  portfolio  management
responsibility for over $4.2 billion  in municipal assets at Mitchell  Hutchins,
including  municipal bond  and money  funds and  private accounts.  From 1981 to
1996,  he  was  associated  with  J.P.  Morgan  Private  Banking  where  he  was
responsible  for  managing municipal  assets,  including several  municipal bond
funds. Mr. Murphy is a senior  vice president and portfolio manager of  Mitchell
Hutchins.  Prior to joining  Mitchell Hutchins in  March 1994, Mr.  Murphy was a
vice president at  American International Group.  Mr. Murphy has  held his  Fund
responsibilities  since  October 1,  1996. Other  members of  Mitchell Hutchins'
tax-exempt investments  group provide  input on  market outlook,  interest  rate
forecasts, and other considerations pertaining to tax-exempt investments.
    
 
     Mitchell   Hutchins   investment   personnel  may   engage   in  securities
transactions  for  their  own  accounts  pursuant  to  a  code  of  ethics  that
establishes   procedures   for   personal   investing   and   restricts  certain
transactions.
 
         DIVIDENDS AND OTHER DISTRIBUTIONS; DIVIDEND REINVESTMENT PLAN
 
DIVIDENDS AND OTHER DISTRIBUTIONS
 
     The Fund declares and pays monthly cash dividends to Common Stockholders at
a level rate that, on an annual basis and after the payment of dividends on  any
outstanding  preferred stock, results  in the distribution of  all of the Fund's
net  investment  income.   The  dividend   rate  is  adjusted   by  the   Fund's
 
                                       19
 

<PAGE>
<PAGE>
board of directors as necessary to reflect the performance of the Fund. Dividend
levels   are  determined  by   the  Fund's  board   of  directors  after  giving
consideration to a  number of  factors, including the  Fund's undistributed  net
investment  income, historical and projected net investment income, expenses and
projected payments to preferred stockholders. The Fund's policy to pay dividends
on the Common  Stock on  this basis  may be changed  by its  board of  directors
without notice to stockholders.
 
   
     The   Fund   intends  to   distribute   annually  to   Common  Stockholders
substantially all of its realized net capital gain (the excess of net  long-term
capital  gain over net short-term capital  loss) and its realized net short-term
capital gain to the extent that such capital gains are not necessary to  satisfy
the  dividend, redemption  or liquidation  preferences of  the APS  or any other
preferred stock.
    
 
     To  enable  the  Fund  to  maintain  level  monthly  dividends,  the   Fund
anticipates  that its monthly dividends may from  time to time represent less or
more than the entire amount of net  investment income earned by the Fund in  the
period  to which the dividend relates. Undistributed net investment income would
be available to supplement future distributions which might otherwise have  been
reduced  by  reason  of a  decrease  in the  Fund's  monthly net  income  due to
fluctuations or expenses  or due  to an  increase in  the dividend  rate on  the
Fund's  outstanding preferred stock. As a result, dividends paid by the Fund for
any particular  monthly period  may  be more  or less  than  the amount  of  net
investment  income earned by  the Fund during  the related period. Undistributed
net investment  income will  be reflected  in the  Fund's net  asset value,  and
correspondingly,  distributions  from undistributed  net investment  income will
reduce the Fund's net asset value.
 
     For federal  tax purposes,  the  Fund is  required to  allocate  tax-exempt
income,  net realized capital gains and  any other taxable income between shares
of Common Stock and  shares of any  preferred stock in  proportion to the  total
dividends  and other distributions paid to each class for the year in which such
tax-exempt income, net realized capital gains or other taxable income is  earned
or realized. See 'Taxes.'
 
     While  any shares of the APS are  outstanding, the Fund may not declare any
cash dividend or other distribution  on its Common Stock  unless at the time  of
such  declaration: (1) all accrued dividends on  the APS have been paid; (2) any
required redemptions of the APS have been  made; (3) after giving effect to  the
dividend  or other distribution, the asset  coverage requirements imposed by the
rating agencies then rating the APS would be satisfied; and (4) the Fund's total
assets, less all liabilities and indebtedness not deemed to be senior securities
under the 1940 Act  (determined after deducting the  amount of such dividend  or
other  distribution),  are  at  least  200%  of  the  liquidation  value  of the
outstanding  APS  (plus  any  outstanding  indebtedness  deemed  to  be   senior
securities).  Under certain  circumstances, these  limitations could  impair the
ability of the Fund to  maintain its qualification for  treatment as a RIC.  See
'Taxes.' For further information regarding the impact of the issuance of the APS
on  the payment of  dividends and other  distributions on the  Common Stock, see
'Special Leverage Considerations.'
 
DIVIDEND REINVESTMENT PLAN
 
     The Fund  has established  the Plan,  under which  all Common  Stockholders
whose shares are registered in their own names, or in the name of PaineWebber or
its  nominee,  have all  dividends and  other distributions  on their  shares of
Common Stock automatically reinvested in  additional shares, unless such  Common
Stockholders  elect to receive cash. Common Stockholders may affirmatively elect
to receive all dividends  and other distributions in  cash paid by check  mailed
directly  to  them  by PNC  Bank,  National Association  ('Transfer  Agent'), as
dividend disbursing agent. Common Stockholders who elect to hold their shares in
the name of a  broker or nominee  other than PaineWebber  or its nominee  should
contact  such broker  or other  nominee to determine  whether, or  how, they may
participate in the Plan. The ability of such Common Stockholders to  participate
in  the Plan may change if their shares of the Common Stock are transferred into
the name of another broker or nominee.
 
     The  Transfer  Agent  serves  as  agent  for  the  Common  Stockholders  in
administering the Plan. After the Fund declares a dividend or determines to make
a  capital gain distribution, the Transfer Agent, as agent for the participants,
receives the cash payment and uses it to buy shares of Common Stock in the  open
market,  on the NYSE  or otherwise, for the  participants' accounts. Such shares
may be purchased
 
                                       20
 

<PAGE>
<PAGE>
at prices that are  higher or lower than  the net asset value  per share of  the
Common  Stock at the time of purchase.  The number of shares purchased with each
dividend or other distribution  for a particular  Common Stockholder equals  the
result  obtained by  dividing the amount  of the dividend  or other distribution
payable to that stockholder by the average price per share (including applicable
brokerage commissions) that the  Transfer Agent was able  to obtain in the  open
market.  The Fund will  not issue any  new shares of  Common Stock in connection
with the Plan. The Transfer Agent maintains all stockholder accounts in the Plan
and furnishes  written  confirmations  of  all  transactions  in  the  accounts,
including  information  needed by  stockholders  for personal  and  tax records.
Shares in the account of each Plan participant are held by the Transfer Agent in
non-certificated form in  the name  of the participant,  and each  stockholder's
proxy includes those shares of Common Stock purchased pursuant to the Plan.
 
     There  is  no charge  to participants  for  reinvesting dividends  or other
distributions. The Transfer  Agent's fees  for the handling  of reinvestment  of
distributions  are paid by the  Fund. However, each participant  pays a pro rata
share of brokerage  commissions incurred  with respect to  the Transfer  Agent's
open  market purchases  of Fund  shares in  connection with  the reinvestment of
distributions.
 
     The automatic reinvestment of dividends  and other distributions in  shares
of  Common Stock  will not relieve  participants of  any income tax  that may be
payable on such distributions. See 'Taxes.'
 
   
     A holder  who  has  elected  to  participate  in  the  Plan  may  terminate
participation  in the Plan at any  time without penalty, and Common Stockholders
who have previously terminated  participation in the Plan  may rejoin it at  any
time.  Changes in elections  must be made  in writing to  the Transfer Agent and
should include the stockholder's  name and address as  they appear on the  share
certificate  or  in  the  Transfer Agent's  records.  An  election  to terminate
participation in the Plan, until such election is changed, will be deemed to  be
an  election by  a Common  Stockholder to  take all  subsequent distributions in
cash. An election will be effective only for distributions declared and having a
record date at least ten days after the date on which the election is received.
    
 
     Experience  under  the  Plan  may  indicate  that  changes  are  desirable.
Accordingly,  the Fund reserves  the right to  amend or terminate  the Plan with
respect to any dividend or other distribution if notice of the change is sent to
Plan participants at least 30 days before the record date for such distribution.
The Plan also may be amended or terminated by the Transfer Agent by at least  30
days' written notice to all Plan participants. All correspondence concerning the
Plan should be directed to the Transfer Agent at PNC Bank, National Association,
c/o PFPC Inc., P.O. Box 8950, Wilmington, Delaware 19899.
 
                                     TAXES
 
     The  Fund intends to continue  to qualify for treatment  as a RIC under the
Internal Revenue Code. For each taxable year that the Fund so qualifies, it will
be relieved of federal income tax on that part of its investment company taxable
income (consisting generally  of taxable net  investment income, net  short-term
capital  gain and net realized gains  from certain hedging transactions) and net
capital gain that is distributed to its stockholders.
 
     Distributions by the Fund of the excess of tax-exempt interest income  over
certain   amounts  disallowed  as  deductions,  which  the  Fund  designates  as
'exempt-interest dividends,' generally may be excluded from gross income by  its
stockholders  for federal income tax purposes; those distributions may, however,
be taxable for  state and local  tax purposes. In  order to pay  exempt-interest
dividends,  the Fund must  (and intends to continue  to) satisfy the requirement
that, at the  close of each  quarter of its  taxable year, at  least 50% of  the
value  of its  total assets  consists of  obligations the  interest on  which is
tax-exempt.
 
     If the Fund invests in any instruments that generate taxable income,  under
the  circumstances  described  in  'Other  Investment  Practices  --  Short-Term
Tax-Exempt and  Taxable  Investments,'  distributions  of  the  interest  earned
thereon  will be taxable  to the Fund's  stockholders as ordinary  income to the
extent of its earnings and profits. Moreover, if the Fund realizes capital gains
as a result of  market transactions, distributions of  those gains also will  be
taxable to its stockholders.
 
     Interest on indebtedness incurred or continued by a stockholder to purchase
or  carry shares of Common  Stock is not deductible  to the extent that interest
relates to exempt-interest dividends received
 
                                       21
 

<PAGE>
<PAGE>
from the  Fund. If  the Fund  invests  in certain  private activity  bonds,  the
portion  of the  Fund's exempt-interest  dividends that  is attributable  to the
interest it earns thereon  and that is  specified in an  annual notice from  the
Fund must be treated by its stockholders as a Tax Preference Item in calculating
their  liability for the AMT. Corporate  stockholders, however, must include all
of  their  exempt-interest  dividends  in  calculating  their  adjusted  current
earnings for purposes of the AMT.
 
     The  Fund notifies its stockholders following the end of each calendar year
of the amounts of exempt-interest dividends, taxable dividends and capital  gain
distributions paid (or deemed paid) that year and of any portion thereof that is
a Tax Preference Item. Dividends and other distributions declared by the Fund in
October,  November or December of any year and payable to stockholders of record
on a date in any of  those months will be deemed to  have been paid by the  Fund
and  received  by  those  stockholders  on  December  31  of  that  year  if the
distributions are paid by  the Fund during  the following January.  Accordingly,
those distributions will be reported by those stockholders for the year in which
that December 31 falls.
 
     Upon  a  sale or  exchange  of shares  of  Common Stock  (including  a sale
pursuant to  a  share  repurchase  or  tender  offer  by  the  Fund),  a  Common
Stockholder  generally  will  realize  a  taxable gain  or  loss  (equal  to the
difference between his adjusted basis for  the shares and the amount  realized),
which will be treated as a capital gain or loss if the shares are capital assets
in  the stockholder's hands and will be a  long-term capital gain or loss if the
shares have been held for more than one year. Notwithstanding this general rule,
however, any loss realized on a sale  or exchange of shares of Common Stock  (1)
will  be disallowed to  the extent of any  exempt-interest dividends received on
those shares, and any loss not disallowed will be treated as a long-term, rather
than  as  a  short-term,  capital  loss  to  the  extent  of  any  capital  gain
distributions  received thereon, if the shares were held for six months or less,
and (2) will  be disallowed to  the extent  those shares are  replaced by  other
shares  of Common Stock within a period of  61 days beginning 30 days before and
ending 30 days after the date of  disposition of the shares (which could  occur,
for  example, as the  result of participation  in the Plan),  in which event the
replacement shares' basis will be adjusted to reflect the disallowed loss.
 
     Investors also  should be  aware that  if shares  of the  Common Stock  are
purchased shortly before the record date for any distribution, the investor will
pay  full price for the shares and could  receive some portion of the price back
as an exempt-interest dividend, a taxable dividend or capital gain distribution.
 
     The foregoing is only a summary of the important federal tax considerations
generally affecting the  Fund and  the Common Stockholders;  see the  SAI for  a
further   discussion.  There   may  be  other   federal,  state   or  local  tax
considerations applicable to a particular investor. Prospective stockholders are
therefore urged to consult their tax advisers.
 
                          DESCRIPTION OF CAPITAL STOCK
 
     The Fund is authorized to issue 200 million shares of capital stock,  $.001
par  value. Currently, 800 shares of capital  stock are classified as APS Series
A, 800 shares of  capital stock are  classified as APS Series  B, 800 shares  of
capital stock are classified as APS Series C and 600 shares of capital stock are
classified as APS Series D. All remaining shares of capital stock are classified
as  Common  Stock. The  description  set forth  below  under 'Common  Stock' and
'Auction Preferred Shares' is subject to the provisions contained in the  Fund's
Articles of Incorporation and By-Laws.
 
COMMON STOCK
 
     Shares  of the  Common Stock  have no  preemptive, conversion,  exchange or
redemption rights.  Each  share has  equal  voting, dividend,  distribution  and
liquidation  rights.  The  outstanding shares  of  Common Stock  are,  and those
offered hereby, when issued,  will be, fully paid  and nonassessable. Except  as
otherwise  indicated  in this  Prospectus and  except  as otherwise  required by
applicable law,  holders of  shares of  the APS  have equal  voting rights  with
Common  Stockholders (one  vote per  share) and  will vote  together with Common
Stockholders as a single class. All voting rights for the election of  directors
are  noncumulative, which means that the holders  of more than 50% of the shares
can elect 100% of the directors then nominated for election if they choose to do
so and, in such event, the holders of the
 
                                       22
 

<PAGE>
<PAGE>
remaining shares will not be able  to elect any directors. However, the  holders
of  the APS, voting as a class, are  entitled to elect two directors. The rights
of the holders  of the  Common Stock  to elect directors  and to  vote on  other
matters  are subject to the  voting rights of the  APS, as discussed below under
'Description of Capital Stock -- Auction Preferred Shares.'
 
     Under the  rules of  the  NYSE applicable  to  listed companies,  the  Fund
normally  is required to hold an annual meeting of stockholders in each year. If
the Fund is  converted to an  open-end investment  company or if  for any  other
reason the Fund's shares are no longer listed on the NYSE (or any other national
securities exchange the rules of which require annual meetings of stockholders),
the   Fund  may  decide  not  to  hold  annual  meetings  of  stockholders.  See
'Description of Capital  Stock --  Common Stock Repurchases  and Tender  Offers;
Description of Capital Stock -- Conversion to Open-End Investment Company.'
 
   
     Shares  of closed-end investment companies,  including the Fund, frequently
trade at a discount  to their net asset  values. Whether investors will  realize
gains  or losses upon the sale of Common Stock will not depend directly upon the
Fund's net asset value,  but will depend  upon whether the  market price of  the
Common  Stock at the time of sale is  above or below the original purchase price
for the shares. This market risk is separate and distinct from the risk that the
Fund's net asset value may decrease.  Accordingly, the Common Stock is  designed
primarily  for long-term investors, and investors in the Common Stock should not
view the Fund as a vehicle for trading purposes.
    
 
     Any additional offerings of the Fund's Common Stock, if made, will  require
approval of its board of directors and will be subject to the requirement of the
1940 Act that shares may not be sold at a price below the then current net asset
value,  exclusive of underwriting discounts and commissions, except, among other
things, in connection  with an  offering to  existing stockholders  or with  the
consent  of  a  majority  of  the  holders  of  the  Fund's  outstanding  voting
securities.
 
   
     The following  chart  indicates  the Fund's  preferred  and  common  shares
outstanding as of [July 31, 1997].
    
 
<TABLE>
<CAPTION>
                                                                                                  AMOUNT OUTSTANDING
                                                                                                     EXCLUSIVE OF
                                                                               AMOUNT HELD          AMOUNT HELD BY
                                                                              BY REGISTRANT           REGISTRANT
                   TITLE OF CLASS                      AMOUNT AUTHORIZED    OR FOR ITS ACCOUNT    OR FOR ITS ACCOUNT
- ----------------------------------------------------   -----------------    ------------------    ------------------
 
<S>                                                    <C>                  <C>                   <C>
Common Stock........................................      [199,997,000]          --                     [20,628,363]
APS Series A........................................               800           --                             800
APS Series B........................................               800           --                             800
APS Series C........................................               800           --                             800
APS Series D........................................               600           --                             600
</TABLE>
 
AUCTION PREFERRED SHARES
 
     General.  Holders  of  the  APS are  entitled  to  receive  cumulative cash
dividends at  an adjustable  rate  determined through  an auction  process.  See
'Special  Leverage Considerations -- Preferred Stock.' All outstanding shares of
APS are fully paid and non-assessable,  have no preemptive or conversion  rights
and  are not  subject to  any sinking fund  provisions. As  long as  the APS are
outstanding, the composition  of the  Fund's investment  portfolio will  reflect
guidelines  established by the rating agencies  rating the APS. See 'Appendix B'
to the SAI.
 
     Liquidation Preference. Upon a liquidation  of the Fund, whether  voluntary
or  involuntary, the  holders of  the APS then  outstanding will  be entitled to
receive and to be paid out of the assets of the Fund available for  distribution
to  its stockholders, before  any payment or  distribution shall be  made on the
Common Stock or on any  other class of stock of  the Fund ranking junior to  the
APS upon liquidation, an amount equal to the liquidation preference with respect
to the APS. The liquidation preference for the APS is $50,000 per share, plus an
amount  equal  to all  dividends  thereon (whether  or  not earned  or declared)
accumulated but unpaid to the date  of final distribution. After the payment  to
the  holders of the APS of the full  preferential amounts, the holders of APS as
such shall have no right  or claim to any of  the remaining assets of the  Fund.
Neither  the sale of  all or substantially  all the property  or business of the
Fund, nor  the merger  or  consolidation of  the Fund  into  or with  any  other
 
                                       23
 

<PAGE>
<PAGE>
corporation  nor the  merger or consolidation  of any other  corporation into or
with the Fund shall be a liquidation, whether voluntary or involuntary, for  the
purposes of this paragraph.
 
     Voting  Rights. Holders of the APS  generally will have equal voting rights
with holders  of Common  Stock (one  vote  per share)  and generally  will  vote
together with Common Stockholders as a single class. However, in connection with
the election of the Fund's directors, holders of outstanding shares of preferred
stock,  including any APS, voting as a separate class, are entitled to elect two
of  the  Fund's  directors;  the  remaining  directors  are  elected  by  Common
Stockholders  and preferred stockholders, including any  APS, voting as a single
class. In addition, if at any time dividends (whether or not earned or declared)
on any outstanding preferred stock, including  the APS, shall be due and  unpaid
in  an amount equal  to two full  years' dividends thereon,  then the holders of
outstanding shares of preferred stock, including  any APS, voting as a  separate
class,  will be entitled to elect a majority of the total number of directors of
the Fund so long as such dividends remain unpaid.
 
     So long as any of the APS  are outstanding, the Fund will not, without  the
affirmative vote of a majority of the outstanding APS, determined with reference
to  a 'majority  of outstanding  voting securities' as  that term  is defined in
Section 2(a)(42)  of  the  1940  Act  (voting  separately  as  one  class):  (a)
authorize, create or issue any class or series of stock ranking prior to or on a
parity with the APS with respect to the payment of dividends or the distribution
of assets upon liquidation or increase the authorized amount of APS (except that
the Fund may, without the vote of the holders of APS, authorize, create or issue
classes  or series  of preferred  stock ranking  on a  parity with  the APS with
respect to  the  payment  of  dividends and  the  distribution  of  assets  upon
liquidation subject to continuing compliance by the Fund with the asset coverage
requirement  of  the  1940 Act  and  APS basic  maintenance  amount requirements
established  by  Moody's  or  S&P;  provided  that  the  Fund  obtains   written
confirmation from Moody's (if Moody's is then rating the APS) and S&P (if S&P is
then rating the APS) that the issuance of any such additional class or series of
preferred  stock would not impair the rating then assigned by such rating agency
to the APS),  (b) amend, alter  or repeal the  Fund's Articles of  Incorporation
insofar  as  they  relate to  the  APS  ('APS Provisions'),  whether  by merger,
consolidation or otherwise, so  as to affect any  preference, right or power  of
such APS or the holders thereof; provided that (i) none of the actions permitted
by  the exception to (a) above will be deemed to affect such preferences, rights
or powers and (ii) the authorization, creation and issuance of classes or series
of stock ranking junior to the APS with respect to payment of dividends and  the
distribution   of  assets  upon  liquidation  will  be  deemed  to  affect  such
preferences, rights or powers only if Moody's or S&P is then rating the Fund and
such issuance would,  at the time  thereof, cause  the Fund not  to satisfy  the
asset  coverage or APS basic maintenance amount referred to above, or (c) file a
voluntary application for  relief under  federal bankruptcy law  or any  similar
application  under state  law for so  long as the  Fund is solvent  and does not
foresee becoming insolvent.
 
     The Fund's board of directors may, however, without approval of the holders
of APS, amend,  alter or repeal  any or all  of the definitions  required to  be
contained  in the APS  Provisions by the  rating agencies in  the event the Fund
receives written confirmation from the  appropriate rating agency that any  such
amendment,  alteration or repeal  would not impair the  ratings then assigned to
the APS by such rating agency. Unless a higher percentage is provided for  under
'Description  of  Capital  Stock  --  Certain  Anti-Takeover  Provisions  of the
Articles of Incorporation,' the affirmative vote of the holders of a majority of
the outstanding APS, voting as a separate class, will be required to approve any
plan of reorganization (as  such term is defined  under the 1940 Act)  adversely
affecting  such shares or any action requiring  a vote of security holders under
Section 13(a) of  the 1940  Act including, among  other things,  changes in  the
Fund's  investment objective or changes in the investment restrictions described
as fundamental policies  under 'Investment  Limitations' in the  SAI. The  class
vote  of holders of  APS described above will  in each case be  in addition to a
separate vote of the requisite percentage of shares of Common Stock necessary to
authorize the action in question. To the extent permitted by the 1940 Act,  each
Series of APS may vote as a separate series in certain circumstances.
 
     The  foregoing voting provisions will not apply with respect to the APS if,
at or prior to the time  when a vote is required,  such APS shall have been  (i)
redeemed  or (ii)  called for  redemption and  sufficient funds  shall have been
deposited in trust to effect such redemption.
 
                                       24
 

<PAGE>
<PAGE>
     Redemption, Purchase and Sale of APS by the Fund. The APS are redeemable by
the Fund in  whole or  in part  at the original  purchase price  per share  plus
accrued   dividends  per  share  and  any  applicable  redemption  premium.  Any
redemption or purchase of shares of the APS or any other preferred stock by  the
Fund  will reduce the leverage  applicable to shares of  Common Stock, while any
resale of shares by the Fund will increase such leverage. See 'Special  Leverage
Considerations.'
 
     The  board of directors,  without the approval  of the Common Stockholders,
may authorize an additional offering of preferred stock and may fix the terms of
the preferred stock to be offered.
 
COMMON STOCK REPURCHASES AND TENDER OFFERS
 
   
     In recognition of the  possibility that the Common  Stock might trade at  a
discount  from net asset value and that any such discount may not be in the best
interest of Common Stockholders,  the Fund's board  of directors has  determined
that  it will from time  to time consider taking action  to attempt to reduce or
eliminate any discount. To  that end, the board,  in consultation with  Mitchell
Hutchins, at least annually considers whether to repurchase shares of the Common
Stock  in the open  market or to  make a tender  offer for shares  of the Common
Stock at their  net asset  value. At  such times,  the board  may consider  such
factors  as the  market price of  the Common Stock,  the net asset  value of the
Common Stock, the liquidity of the assets of the Fund, whether such transactions
would impair the Fund's status  as a RIC or result  in a failure to comply  with
applicable  asset coverage  requirements, general  economic conditions  and such
other events or conditions that may have a material effect on the Fund's ability
to consummate such  transactions. Under  certain circumstances,  it is  possible
that  open market  repurchases or  tender offers  may constitute  a distribution
under the Internal Revenue Code to  the remaining stockholders of the Fund.  The
board  may at  any time,  however, decide  that the  Fund should  not repurchase
shares or make a tender offer. Common Stock will not be repurchased unless after
such  repurchase  the  Fund  would  continue  to  satisfy  the  asset   coverage
requirements  imposed  under the  1940 Act  with  respect to  the APS  and asset
coverage requirements that may be imposed by any rating agency as a condition of
its rating of the  APS. The Fund  may borrow to  finance repurchases and  tender
offers.  Interest on any such borrowings will  reduce the Fund's net income. See
'Special Leverage Considerations -- Borrowings.'
    
 
     There is no assurance that repurchases or tender offers will result in  the
Common  Stock trading at a price  that is equal or close  to its net asset value
per share. The market price of shares of the Common Stock will be determined by,
among other things, the  relative demand for  and supply of  such shares in  the
market,  the Fund's investment  performance, the Fund's  dividends and yield and
investor perception of  the Fund's  overall attractiveness as  an investment  as
compared  with other  investment alternatives.  Nevertheless, the  fact that the
Common Stock may be the subject of tender offers at net asset value from time to
time may reduce the spread that  might otherwise exist between the market  price
of  the Common Stock and  net asset value per share.  In the opinion of Mitchell
Hutchins, sellers may be less inclined to accept a significant discount if  they
have  a  reasonable expectation  of being  able  to recover  net asset  value in
conjunction with a possible tender offer.
 
     Although the board of directors believes that share repurchases and  tender
offers generally would have a favorable effect on the market price of the Common
Stock,  it should  be recognized  that the Fund's  acquisition of  shares of the
Common Stock  would decrease  the Fund's  total assets  and therefore  have  the
effect  of increasing the Fund's expense ratio and decreasing the asset coverage
with respect  to  any outstanding  APS.  Because of  the  nature of  the  Fund's
investment  objective, policies  and portfolio, under  current market conditions
Mitchell Hutchins  anticipates  that  repurchases and  tender  offers  generally
should  not have a material, adverse effect on the Fund's investment performance
and that Mitchell Hutchins generally should not have any material difficulty  in
disposing  of portfolio securities in order  to consummate share repurchases and
tender offers; however, this may not always be the case.
 
     Any tender offer made by the Fund for shares of the Common Stock  generally
would  be at  a price  equal to  the net  asset value  of the  shares on  a date
subsequent to the Fund's receipt of all  tenders. Each offer would be made,  and
the  Common Stockholders would be notified,  in accordance with the requirements
of the Securities Exchange Act of 1934  and the 1940 Act, either by  publication
or  mailing  or both.  Each  person tendering  shares  would pay  to  the Fund's
Transfer Agent a  service charge  to help  defray certain  costs, including  the
processing   of  tender   forms,  effecting   payment,  postage   and  handling.
 
                                       25
 

<PAGE>
<PAGE>
The Fund expects that  the costs of  effecting a tender  offer would exceed  the
aggregate  of all service  charges received from those  who tender their shares.
Costs associated with the tender would be charged against capital.
 
   
     Tendered shares of Common  Stock that have been  accepted and purchased  by
the  Fund will  be held in  the Fund's treasury  until retired by  the board. If
tendered shares are not retired, the Fund may hold, sell or otherwise dispose of
the shares  for any  lawful corporate  purpose  as determined  by the  board  of
directors.
    
 
CONVERSION TO OPEN-END INVESTMENT COMPANY
 
     The  Fund's board of directors  will consider from time  to time whether it
would be  in the  best interests  of the  Fund and  its Common  Stockholders  to
convert  the Fund to an  open-end investment company. If  the board of directors
determines that such a conversion would be in the best interests of the Fund and
its Common Stockholders  and is  consistent with the  1940 Act,  the board  will
submit  to the  Fund's stockholders,  at the  next succeeding  annual or special
meeting, a proposal to amend the Fund's Articles of Incorporation to so  convert
the Fund. Such amendment would provide that, upon its adoption by the holders of
at  least a majority of the Fund's  outstanding shares entitled to vote thereon,
the Fund will convert  from a closed-end to  an open-end investment company.  If
the  Fund  converted to  an open-end  investment  company, it  would be  able to
continuously issue and offer for sale shares of the Common Stock, and each  such
share  could be presented  to the Fund at  the option of  the holder thereof for
redemption at a price based  on the then current net  asset value per share.  In
such event, the Fund could be required to liquidate portfolio securities to meet
requests  for redemption, the Common Stock would no longer be listed on the NYSE
and certain  investment  policies  of  the  Fund  would  require  amendment.  In
addition,  conversion to an  open-end investment company  would require that the
Fund redeem any  outstanding shares  of APS. The  Fund might  have to  liquidate
portfolio   securities  to  finance  such  redemptions.  See  'Special  Leverage
Considerations.'
 
     In considering whether  to propose  that the  Fund convert  to an  open-end
investment  company,  the  board  of directors  will  consider  various factors,
including, without limitation, the potential benefits and detriments to the Fund
and its stockholders of conversion, the potential alternatives and the  benefits
and  detriments associated therewith,  and the feasibility  of conversion given,
among other things, the Fund's investment  objective and policies. In the  event
of  a conversion to an open-end investment  company, the Fund may charge fees in
connection with the sale or redemption of its shares. There can be no  assurance
that  the board will conclude that such a  conversion is in the best interest of
the Fund or Common Stockholders. As an open-end investment company, the Fund may
reserve the right to honor any request for redemption by making payment in whole
or in part in securities chosen by the  Fund and valued in the same way as  they
would be valued for purposes of computing the Fund's net asset value. If payment
is  made in securities, a shareholder may incur brokerage expenses in converting
these securities into cash.
 
CERTAIN ANTI-TAKEOVER PROVISIONS OF THE ARTICLES OF INCORPORATION
 
     The Fund presently  has provisions  in its Articles  of Incorporation  that
have  the effect of  limiting: (1) the  ability of other  entities or persons to
acquire control  of  the Fund;  (2)  the Fund's  freedom  to engage  in  certain
transactions;  or (3)  the ability  of the  Fund's directors  or stockholders to
amend the  Articles  of  Incorporation.  These provisions  of  the  Articles  of
Incorporation  may be regarded as 'anti-takeover' provisions. Under Maryland law
and the Fund's Articles of Incorporation, the affirmative vote of the holders of
at least  a majority  of the  votes  entitled to  be cast  is required  for  the
consolidation of the Fund with another corporation, a merger of the Fund with or
into  another corporation (except for  certain mergers in which  the Fund is the
successor), a statutory share exchange in which the Fund is not the successor, a
sale or  transfer  of  all  or  substantially all  of  the  Fund's  assets,  the
dissolution   of  the  Fund  and  any   amendment  to  the  Fund's  Articles  of
Incorporation. In addition,  the affirmative  vote of  the holders  of at  least
66  2/3% (which is higher than that required under Maryland law or the 1940 Act)
of the outstanding shares of the  Fund's capital stock is required generally  to
authorize  any of the following  transactions or to amend  the provisions of the
Articles of Incorporation relating to such transactions:
 
                                       26
 

<PAGE>
<PAGE>
             (1) merger, consolidation or statutory  share exchange of the  Fund
        with or into any other corporation;
 
             (2)  issuance of any securities of the Fund to any person or entity
        for cash;
 
             (3) sale, lease or exchange of  all or any substantial part of  the
        assets  of the  Fund to  any entity or  person (except  assets having an
        aggregate market value of less than $1,000,000); or
 
             (4) sale, lease or exchange to the Fund, in exchange for securities
        of the Fund, of any assets of any entity or person (except assets having
        an aggregate fair market value of less than $1,000,000)
 
if such  corporation,  person  or  entity is  directly,  or  indirectly  through
affiliates,  the beneficial owner of  more than 5% of  the outstanding shares of
the Fund (a 'Principal Shareholder'). A similar vote also would be required  for
any  amendment of the Articles of Incorporation  to convert the Fund to an open-
end investment  company  by making  any  class of  the  Fund's capital  stock  a
'redeemable  security,' as that term is defined in the 1940 Act. Such vote would
not be required  with respect  to any  of the  foregoing transactions,  however,
when, under certain conditions, the board of directors approves the transaction,
although  in certain  cases involving  merger, consolidation  or statutory share
exchange or  sale of  all  or substantially  all of  the  Fund's assets  or  the
conversion  of the Fund to an  open-end investment company, the affirmative vote
of the holders of  a majority of  the outstanding shares  of the Fund's  capital
stock  would  nevertheless be  required. Reference  is made  to the  Articles of
Incorporation of the  Fund, on file  with the SEC,  for the full  text of  these
provisions.  These voting rights are in addition to the rights of the holders of
any preferred stock outstanding  to vote as a  single class on certain  matters.
See 'Description of Capital Stock -- Auction Preferred Shares.'
 
     The  provisions of  the Articles of  Incorporation described  above and the
Fund's right to repurchase or make a tender offer for its shares could have  the
effect  of  depriving the  Common Stockholders  of  opportunities to  sell their
shares at a premium over prevailing market prices by discouraging a third  party
from  seeking  to  obtain control  of  the Fund  in  a tender  offer  or similar
transaction. See 'Description of Capital  Stock -- Common Stock Repurchases  and
Tender Offers; Description of Capital Stock -- Conversion to Open-End Investment
Company.' The overall effect of these provisions is to render more difficult the
accomplishment  of  a  merger  or  the  assumption  of  control  by  a Principal
Shareholder. They  provide,  however,  the advantage  of  potentially  requiring
persons  seeking control of the Fund  to negotiate with its management regarding
the price to be paid and  facilitating the continuity of the Fund's  management,
investment  objective  and policies.  The  board of  directors  of the  Fund has
considered the foregoing anti-takeover provisions and concluded that they are in
the best interests of the Fund and its stockholders.
 
        CUSTODIAN, TRANSFER AND DIVIDEND DISBURSING AGENT AND REGISTRAR
 
     State Street  Bank and  Trust Company,  One Heritage  Drive, North  Quincy,
Massachusetts  02171,  serves  as  custodian of  the  Fund's  assets.  PNC Bank,
National Association, whose  principal business  address is  Broad and  Chestnut
Streets,  Philadelphia,  Pennsylvania  19110, serves  as  transfer  and dividend
disbursing agent and registrar with respect  to the Common Stock. Bankers  Trust
Company,  Four Albany  Street, New  York, New York  10006 serves  as the Auction
Agent with respect to  the APS and acts  as transfer agent, registrar,  dividend
disbursing  agent and agent for certain notifications for the Fund in connection
with the APS.
 
                              FURTHER INFORMATION
 
     Further information concerning these securities  and the Fund may be  found
in  the  Registration Statement,  of which  this Prospectus  and the  Fund's SAI
constitute a part, on file with the SEC.
 
                                       27




<PAGE>
<PAGE>
            TABLE OF CONTENTS OF STATEMENT OF ADDITIONAL INFORMATION
 
   
<TABLE>
<CAPTION>
                                                                                                              PAGE
                                                                                                              ----
 
<S>                                                                                                           <C>
Investment Policies and Restrictions.......................................................................     1
Hedging and Related Income Strategies......................................................................     9
Directors and Officers.....................................................................................    15
Control Persons and Principal Holders of Securities........................................................    21
Investment Advisory Arrangements...........................................................................    21
Portfolio Transactions.....................................................................................    22
Valuation of Common Stock..................................................................................    24
Taxes......................................................................................................    25
Additional Information.....................................................................................    27
Financial Information......................................................................................    27
Appendix A.................................................................................................   A-1
Appendix B.................................................................................................   B-1
</TABLE>
    
 
                                       28
 

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<PAGE>
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<PAGE>
<PAGE>
                                   APPENDIX A
                         TYPES OF MUNICIPAL OBLIGATIONS
 
     The  Fund may invest in the following types of Municipal Obligations and in
such other types of Municipal Obligations as become available on the market from
time to time.
 
MUNICIPAL BONDS
 
     Municipal bonds are  debt obligations  issued to obtain  funds for  various
public  purposes.  The  two  principal classifications  of  municipal  bonds are
'general obligation' and 'revenue' bonds.  General obligation bonds are  secured
by  the  issuer's pledge  of its  full faith,  credit and  taxing power  for the
payment of  principal and  interest. Revenue  bonds are  payable only  from  the
revenues  derived from a particular facility or  class of facilities or, in some
cases, from  the proceeds  of a  special  excise tax  or from  another  specific
source, such as the user of the facility being financed. Certain municipal bonds
are  'moral obligation'  issues, which  normally are  issued by  special purpose
public authorities. In  the case of  such issues, an  express or implied  'moral
obligation'  of a related government unit is  pledged to the payment of the debt
service but is usually subject to annual budget appropriations.
 
INDUSTRIAL DEVELOPMENT BONDS AND PRIVATE ACTIVITY BONDS
 
   
     Industrial development bonds ('IDBs')  and private activity bonds  ('PABs')
are  municipal bonds  issued by  or on behalf  of public  authorities to finance
various privately operated  facilities, such  as airports  or pollution  control
facilities.  IDBs and PABs are generally revenue  bonds and thus are not payable
from the unrestricted revenue of the issuer. The credit quality of IDBs and PABs
is usually directly related to the credit standing of the user of the facilities
being financed. The Fund may invest 25% or more of its assets in IDBs and PABs.
    
 
     IDBs issued after August 15, 1986 generally are considered PABs, and to the
extent the Fund invests in such PABs, stockholders generally will be required to
include a  portion  of  their exempt-interest  dividends  in  calculating  their
liability for the AMT. See 'Taxes.'
 
MUNICIPAL LEASE OBLIGATIONS
 
     Municipal  lease obligations  are Municipal  Obligations that  may take the
form of leases, installment purchase  contracts or conditional sales  contracts,
or  certificates  of participation  with respect  to  such contracts  or leases.
Municipal lease  obligations  are issued  by  state and  local  governments  and
authorities  to  purchase land  or various  types  of equipment  and facilities.
Although municipal lease  obligations do not  constitute general obligations  of
the  municipality for  which the  municipality's taxing  power is  pledged, they
ordinarily are backed by the municipality's covenant to budget for,  appropriate
and  make the  payments due  under the  lease obligation.  The leases underlying
certain Municipal Obligations, however, provide that lease payments are  subject
to  partial or full abatement  if, because of material  damage or destruction of
the leased property, there is substantial interference with the lessee's use  or
occupancy  of  such  property.  This  'abatement risk'  may  be  reduced  by the
existence of  insurance covering  the leased  property, the  maintenance by  the
lessee  of reserve funds or the provision of credit enhancements such as letters
of credit.
 
     The liquidity of municipal lease obligations varies. See 'Other  Investment
Practices.'  Certain  municipal  lease  obligations  contain 'non-appropriation'
clauses which provide that the municipality  has no obligation to make lease  or
installment  purchase payments in future years  unless money is appropriated for
such purpose on a yearly basis. In the case of a 'non-appropriation' lease,  the
Fund's  ability to recover under the lease  in the event of non-appropriation or
default will  be limited  solely to  the repossession  of the  leased  property,
without  recourse to the  general credit of  the lessee, and  disposition of the
property in the event  of foreclosure might prove  difficult. The Fund does  not
intend to invest a significant portion of its assets in such 'non-appropriation'
municipal  lease obligations.  There is no  limitation on the  Fund's ability to
invest in other municipal lease obligations.
 
                                      A-1
 

<PAGE>
<PAGE>
ZERO COUPON OBLIGATIONS
 
     The Fund may invest up to 10% of its total assets in zero coupon  Municipal
Obligations.  Such  obligations include  'pure zero'  obligations, which  pay no
interest for  their entire  life (either  because they  bear no  stated rate  of
interest  or  because  their  stated  rate  of  interest  is  not  payable until
maturity), and 'zero/fixed' obligations,  which pay no  interest for an  initial
period  and  thereafter pay  interest  currently. Zero  coupon  obligations also
include securities  representing  the  principal-only  components  of  Municipal
Obligations  from  which the  interest components  have  been stripped  and sold
separately by the holders of  the underlying Municipal Obligations. Zero  coupon
securities  usually trade at  a deep discount  from their face  or par value and
will be subject to greater fluctuations in market value in response to  changing
interest  rates  than obligations  of  comparable maturities  that  make current
distributions of  interest. While  zero coupon  Municipal Obligations  will  not
contribute to the cash available to the Fund for purposes of paying dividends to
stockholders,  Mitchell  Hutchins  believes  that  limited  investments  in such
securities  may  facilitate  the  Fund's  ability  to  preserve  capital   while
generating  tax-free income through the accrual of original issue discount. Zero
coupon Municipal Obligations will not be counted as income-producing  securities
for  purposes of  the Fund's policy  of normally  investing at least  65% of its
total assets in income-producing  securities. Zero coupon Municipal  Obligations
generally  are liquid, although such liquidity may  be reduced from time to time
due to  interest  rate  volatility  and other  factors.  See  'Other  Investment
Practices.'
 
FLOATING AND VARIABLE RATE OBLIGATIONS
 
     The  Fund also may purchase floating  and variable rate municipal notes and
bonds, which frequently permit the holder to demand payment of principal at  any
time, or at specified intervals, and permit the issuer to prepay principal, plus
accrued  interest,  at  its  discretion after  a  specified  notice  period. The
issuer's obligations under the demand feature of such notes and bonds  generally
are  secured by  bank letters  of credit  or other  credit support arrangements.
There frequently will  be no  secondary market  for variable  and floating  rate
obligations held by the Fund, although the Fund may be able to obtain payment of
principal at face value by exercising the demand feature of the obligation.
 
PARTICIPATION INTERESTS
 
     The  Fund  may  invest  in  participation  interests  in  municipal  bonds,
including IDBs, PABs and floating and variable rate securities. A  participation
interest  gives the Fund  an undivided interest  in a municipal  bond owned by a
bank. The Fund has the right to sell the instrument back to the bank. Such right
is generally backed by the bank's irrevocable letter of credit or guarantee  and
permits  the Fund  to draw on  the letter  of credit on  demand, after specified
notice, for all or any part of the principal amount of the Fund's  participation
interest  plus accrued  interest. Generally,  the Fund  intends to  exercise the
demand under the letters of credit or other guarantees only upon a default under
the terms  of  the underlying  bond,  or to  maintain  the Fund's  portfolio  in
accordance  with its investment objective and policies. The ability of a bank to
fulfill its obligations under a letter of credit or guarantee might be  affected
by  possible financial difficulties  of its borrowers,  adverse interest rate or
economic conditions, regulatory limitations or other factors. Mitchell  Hutchins
will  monitor the pricing, quality and  liquidity of the participation interests
held by the Fund, and the credit standing of banks issuing letters of credit  or
guarantees  supporting such  participation interests  on the  basis of published
financial information reports of rating services and bank analytical services.
 
CUSTODIAL RECEIPTS
 
     The Fund may  acquire custodial  receipts or  certificates underwritten  by
securities dealers or banks that evidence ownership of future interest payments,
principal  payments or both on certain Municipal Obligations. The underwriter of
these certificates  or receipts  typically purchases  Municipal Obligations  and
deposits  the obligations  in an irrevocable  trust or custodial  account with a
custodian bank,  which  then  issues  receipts  or  certificates  that  evidence
ownership  of the  periodic unmatured  coupon payments  and the  final principal
payment on the  obligations. Custodial  receipts evidencing  specific coupon  or
principal  payments have the  same economic attributes  as zero coupon Municipal
Obligations described
 
                                      A-2
 

<PAGE>
<PAGE>
herein. Although  under the  terms of  a  custodial receipt  the Fund  would  be
typically  authorized to  assert its rights  directly against the  issuer of the
underlying obligation,  the  Fund  could  be  required  to  assert  through  the
custodian  bank those rights that may exist against the underlying issuer. Thus,
in the event the underlying issuer fails to pay principal or interest when  due,
the  Fund may  be subject to  delays, expenses  and risks that  are greater than
those that  would  have  been  involved  if the  Fund  had  purchased  a  direct
obligation  of the issuer. In addition, in the event that the trust or custodial
account in which the underlying security has been deposited is determined to  be
an  association taxable as  a corporation, instead of  a non-taxable entity, the
yield on the underlying  security would be reduced  in recognition of any  taxes
paid.
 
INVERSE FLOATERS
 
     The  Fund may invest in Municipal Obligations on which the rate of interest
varies inversely with interest rates on other Municipal Obligations or an index.
Such obligations include components of securities  on which interest is paid  in
two  separate parts -- an auction component,  which pays interest at a rate that
is set periodically through an auction  process or other method, and a  residual
component,  which pays interest  at a rate  equal to the  difference between the
rate that the issuer would have paid  on a fixed-rate obligation at the time  of
issuance  and the  rate paid on  the auction  component. The market  value of an
inverse floater will be more volatile than that of a fixed-rate obligation  and,
like  most debt obligations, will vary inversely with changes in market interest
rates.
 
     Because the  interest  rate  paid  to holders  of  residual  components  is
generally  determined by  subtracting the interest  rate paid to  the holders of
auction components  from a  fixed amount,  the interest  rate paid  to  residual
component  holders will decrease  as the auction  component's rate increases and
increase as the auction component's rate decreases. Moreover, the extent of  the
increases  and decreases  in market value  of residual components  may be larger
than comparable changes in the  market value of an  equal principal amount of  a
fixed  rate  Municipal  Obligation  having  similar  credit  quality, redemption
provisions and maturity.
 
PUT BONDS
 
     Put bonds are municipal bonds which give the holder an unconditional  right
to  sell the bond back to the issuer or a remarketing agent at a specified price
and exercise date,  which is typically  well in advance  of the bond's  maturity
date.  If the put  is a 'one time  only' put, the Fund  ordinarily will sell the
bond or put the bond, depending on the  more favorable price. If the bond has  a
series  of  puts after  the first  put, the  bond will  be held  as long  as, in
Mitchell Hutchins' opinion, it is  in the best interests of  the Fund to do  so.
The  obligation to  purchase the  bond on the  exercise date  of the  put may be
supported by a letter of credit or  other credit support agreement from a  bank,
insurance  company or other financial institution,  the credit standing of which
affects the credit  standing of the  obligation. There is  no assurance that  an
issuer  or remarketing agent for a put bond  will be able to repurchase the bond
on the put exercise date  if the Fund chooses to  exercise its right to put  the
bond back to the issuer or remarketing agent.
 
TENDER OPTION BONDS
 
     Tender  option  bonds are  long-term municipal  securities  sold by  a bank
subject to a 'tender option' that gives  the purchaser the right to tender  them
to  the  bank at  par plus  accrued  interest at  designated times  (the 'tender
option'). The  tender  option  may  be exercisable  at  intervals  ranging  from
bi-weekly  to semi-annually,  and the  interest rate  on the  bonds is typically
reset at the end of the applicable interval in order to cause the bonds to  have
a  market value that  approximates their par value.  The tender option generally
would not  be  exercisable  in  the  event  of  a  default  on,  or  significant
downgrading  of,  the  underlying municipal  securities.  Therefore,  the Fund's
ability to exercise the tender option will be affected by the credit standing of
both the bank  involved and the  issuer of the  underlying securities. The  Fund
does  not expect to invest more than 5% of its net assets in tender option bonds
during the coming year.
 
                                      A-3
 

<PAGE>
<PAGE>
MUNICIPAL DERIVATIVES
 
     The  Fund  may   invest  in  derivative   securities  that  are   Municipal
Obligations,  or  components thereof,  that  have been  specially  structured to
reflect investment characteristics ordinarily  associated with other  securities
or to have other special rights desired by investors. Generally, such securities
are  designed to  allow investors  to take  advantage of  expected interest rate
trends or to hedge  interest rate or  other risks. The Fund  does not expect  to
invest  more  than 5%  of its  net assets  in any  particular form  of municipal
derivative during  the  coming  year  other than  detachable  call  options  and
Municipal  Obligations with embedded  caps. Detachable call  options are sold by
issuers of Municipal  Obligations separately from  the Municipal Obligations  to
which  the call options relate and permit  the purchasers of the call options to
acquire the Municipal Obligations at the call price(s) and call date(s). In  the
event  that interest rates drop, the purchaser could exercise the call option to
acquire Municipal Obligations  that yield above-market  rates. The Fund  expects
during  the  coming year  only to  acquire detachable  call options  relating to
Municipal Obligations  that  the  Fund  already owns  or  will  acquire  in  the
immediate  future  and  thereby,  in  effect,  make  such  Municipal Obligations
non-callable so long as the Fund  continues to hold the detachable call  option.
Municipal  Obligations  with  embedded  caps  provide  for  additional  tax-free
payments for a stated period (generally a period that is shorter than the bond's
maturity) above the fixed-rated interest payable on the Municipal Obligation  to
the extent that the average level of a particular index exceeds a specified base
level. The Fund would use Municipal Obligations with embedded caps to offset the
risk  of  increases  in  short-term  interest  rates  while  continuing  to earn
tax-exempt income. Investments in  municipal derivatives may  be subject to  the
same  risks  as  floating  rate  Municipal  Obligations,  risks  of  adverse tax
determinations or,  in  the  case  of municipal  derivatives  used  for  hedging
purposes,  risks similar to those for other hedging strategies. See 'Hedging and
Related Income  Strategies.'  The  Fund  will only  invest  in  those  municipal
derivatives  that Mitchell Hutchins believes  will facilitate the Fund's ability
to achieve its investment objective.
 
                                      A-4
 

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<PAGE>
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<PAGE>
<PAGE>
_____________________________                      _____________________________
 
     NO  PERSON  HAS BEEN  AUTHORIZED TO  GIVE  ANY INFORMATION  OR TO  MAKE ANY
REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS IN CONNECTION WITH THE OFFERING
MADE  BY  THIS  PROSPECTUS   AND,  IF  GIVEN  OR   MADE,  SUCH  INFORMATION   OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE FUND OR
PAINEWEBBER.  THIS PROSPECTUS DOES NOT CONSTITUTE AN  OFFERING BY THE FUND OR BY
PAINEWEBBER IN ANY JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY BE MADE.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                                                                                               PAGE
                                                                                                                               ----
 
<S>                                                                                                                            <C>
Fund Expenses...............................................................................................................     2
Prospectus Summary..........................................................................................................     3
Financial Highlights........................................................................................................     9
The Fund....................................................................................................................    11
The Offering................................................................................................................    11
Use of Proceeds.............................................................................................................    11
Trading History.............................................................................................................    11
Investment Objective and Policies...........................................................................................    12
Insurance...................................................................................................................    13
Other Investment Practices..................................................................................................    14
Special Leverage Considerations.............................................................................................    16
Management of the Fund......................................................................................................    19
Dividends and Other Distributions; Dividend Reinvestment Plan...............................................................    19
Taxes.......................................................................................................................    21
Description of Capital Stock................................................................................................    22
Custodian, Transfer and Dividend Disbursing Agent and Registrar.............................................................    27
Further Information.........................................................................................................    27
Table of Contents of Statement of Additional Information....................................................................    28
Appendix A..................................................................................................................   A-1
</TABLE>
    
 
                               INSURED MUNICIPAL
                                INCOME FUND INC.
 
                                  COMMON STOCK
 
                            ------------------------
                              P R O S P E C T U S
                            ------------------------
 
                            PaineWebber Incorporated
 
                            ------------------------
 
   
                                 August 1, 1997
    
 
   
'c' 1997 PaineWebber Incorporated
    


<PAGE>
<PAGE>
                       INSURED MUNICIPAL INCOME FUND INC.
                          1285 AVENUE OF THE AMERICAS
                            NEW YORK, NEW YORK 10019
                      STATEMENT OF ADDITIONAL INFORMATION
 
     Insured  Municipal Income  Fund Inc.  ('Fund') is  a diversified closed-end
management investment company. 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. There  is no  assurance that  the Fund  will
achieve its investment objective.
 
     Prior  to April  12, 1996,  the name of  the Fund  was 'PaineWebber Premier
Insured Municipal Income Fund Inc.' The Fund began doing business under the name
'Insured Municipal  Income Fund'  in August  1995, and  shareholders approved  a
change  of the Fund's name to 'Insured  Municipal Income Fund Inc.' on April 11,
1996.
 
     Shares of the Fund's common stock ('Common Stock') may be offered from time
to time in
order to effect over-the-counter ('OTC')  secondary market sales by  PaineWebber
Incorporated
('PaineWebber')  in  its  capacity  as  a  dealer  and  secondary  market-maker.
PaineWebber may (but
is not obligated to) make such a secondary market.
 
   
     Mitchell Hutchins  Asset Management  Inc. ('Mitchell  Hutchins'), a  wholly
owned  subsidiary of PaineWebber, serves as investment adviser and administrator
of the  Fund.  This  Statement  of  Additional  Information  ('SAI')  is  not  a
prospectus  and  should be  read  only in  conjunction  with the  Fund's current
Prospectus, dated August 1, 1997. Capitalized terms not otherwise defined herein
have the  same meanings  as in  the Prospectus.  Certain terms  relating to  the
Fund's  Auction  Preferred Shares  ('APS') are  defined  in the  Fund's Articles
Supplementary, which are  on file  with the Securities  and Exchange  Commission
('SEC'),  Washington, D.C., as an exhibit to the registration statement of which
this Statement of Additional Information forms  a part and may be obtained  from
the  SEC upon payment of the fee prescribed  or inspected at the SEC's office at
no charge. A copy of the Prospectus may be obtained by contacting PaineWebber at
1285 Avenue of  the Americas, New  York, New  York 10019, or  calling toll  free
1-800-852-4750.  This  Statement of  Additional Information  is dated  August 1,
1997.
    
 
                      INVESTMENT POLICIES AND RESTRICTIONS
 
     The following  supplements  the  information contained  in  the  Prospectus
concerning the Fund's investment policies and limitations.
 
RATINGS AS INVESTMENT CRITERIA
 
     Moody's  Investors Service, Inc. ('Moody's'), Standard & Poor's, a division
of The McGraw-Hill Companies Inc.  ('S&P'), and the other nationally  recognized
statistical  rating organizations  ('NRSROs') are private  services that provide
ratings  of  the  credit  quality  of  debt  obligations,  including   Municipal
Obligations.  It  should be  emphasized  that ratings  are  general and  are not
absolute standards of quality. Consequently, Municipal Obligations with the same
maturity, interest  rate and  rating  may have  different market  prices.  Also,
rating agencies may fail to make timely changes in credit ratings in response to
subsequent  events, so  that an  issuer's financial  condition may  be better or
worse than  is indicated  by its  rating.  A description  of Moody's  and  S&P's
ratings is included in Appendix A to this SAI.
 
APS RATING AGENCY GUIDELINES
 
     The  Fund intends that, so long as the APS are outstanding, the composition
of its  portfolio will  reflect guidelines  established by  Moody's and  S&P  in
connection with their respective ratings of the APS. See Appendix B to this SAI.
 

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MUNICIPAL OBLIGATIONS
 
     Municipal Obligations, like other debt obligations, are subject to the risk
of  non-payment. The ability of issuers  of Municipal Obligations to make timely
payments of interest and principal may be adversely impacted in general economic
downturns  and  as  relative  governmental   cost  burdens  are  allocated   and
reallocated  among federal, state and local governmental units. Such non-payment
would result  in a  reduction of  income  to the  Fund, and  could result  in  a
reduction  in the value of the Municipal Obligation experiencing non-payment and
a potential decrease in the  net asset value of  the Fund. Issuers of  Municipal
Obligations  might seek  protection under the  bankruptcy laws. In  the event of
bankruptcy of such an issuer, the  Fund could experience delays and  limitations
with  respect  to the  collection of  principal and  interest on  such Municipal
Obligations and the Fund may not, in  all circumstances, be able to collect  all
principal  and interest to  which it is  entitled. To enforce  its rights in the
event of a  default in the  payment of  interest or repayment  of principal,  or
both,  the  Fund may  take  possession of  and  manage the  assets  securing the
issuer's obligations on such securities, which may increase the Fund's operating
expenses and adversely affect the net asset value of the Fund.
 
     The Fund may invest up to 20% of its total assets in Municipal  Obligations
that are not insured but are backed by an escrow or trust account which contains
securities  issued  or  guaranteed by  the  U.S. government  or  U.S. government
agencies sufficient in amount to ensure the payment of interest and principal on
the original interest payment and maturity dates ('collateralized obligations').
Such collateralized obligations may not have received a rating from Moody's, S&P
or another  NRSRO. Such  collateralized obligations  will include,  but are  not
limited  to, Municipal Obligations that have been (i) advance refunded where the
proceeds of the  refunding have been  used to purchase  U.S. government or  U.S.
government  agency securities  that are placed  in escrow and  whose interest or
maturing principal  payments, or  both, are  sufficient to  cover the  remaining
scheduled  debt service on the Municipal Obligations, or (ii) issued under state
and local  housing finance  programs which  use the  issuance proceeds  to  fund
mortgages  that are then exchanged for U.S. government or U.S. government agency
securities  and  deposited  with  a  trustee  as  security  for  the   Municipal
Obligations.  Such collateralized  obligations are  normally regarded  by market
participants as  having  the  credit  characteristics  of  the  underlying  U.S.
government or U.S. government agency securities.
 
     Under  normal circumstances, the  Fund does not  invest 25% or  more of its
total assets in any one industry. Governmental issuers of Municipal  Obligations
are  not considered part of any industry and, therefore, are not subject to this
limitation. Municipal  Obligations backed  only by  the assets  and revenues  of
non-governmental  entities,  however,  are  considered  to  be  issued  by  such
non-governmental entities  and would  be subject  to this  limitation. The  Fund
reserves  the right to invest more than 25%  of its assets in issuers located in
the same state,  although it has  no present  intention of doing  so during  the
coming  year. Current rating agency requirements applicable to the rating of the
Fund's APS prohibit such investment. If the Fund were to invest more than 25% of
its total  assets  in issuers  located  in the  same  state, it  would  be  more
susceptible  to  adverse economic,  business  or regulatory  conditions  in that
state.
 
INSURANCE FOR MUNICIPAL OBLIGATIONS
 
     Effect of Insurance on Municipal Obligations. Municipal Obligations covered
by Original  Issue  Insurance  or  Secondary  Market  Insurance  are  themselves
assigned  a rating of  Aaa by Moody's, AAA  by S&P or  an equivalent rating from
another NRSRO, as  the case may  be, by virtue  of such Aaa,  AAA or  equivalent
claims-paying  ability of the  insurer, and would generally  be assigned a lower
rating if the rating were based primarily upon the credit characteristics of the
issuer without regard  to the insurance  feature. In the  event Moody's, S&P  or
another  NRSRO should downgrade its assessment of the claims-paying ability of a
particular insurer, it could also be expected to downgrade the ratings  assigned
to  Municipal Obligations  insured under  Original Issue  Insurance or Secondary
Market Insurance issued by such insurer.
 
     The ratings,  if  any,  assigned to  Municipal  Obligations  insured  under
Portfolio  Insurance will be based primarily  upon the credit characteristics of
the issuer without regard to the  insurance feature, and will generally carry  a
rating  that is below Aaa or AAA. While in the portfolio of the Fund, however, a
Municipal Obligation backed by  Portfolio Insurance will  effectively be of  the
same quality as a
 
                                       2
 

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<PAGE>
Municipal  Obligation issued by  an issuer of  comparable credit characteristics
that is backed by Original Issue Insurance or Secondary Market Insurance. In the
event Moody's, S&P or another NRSRO should downgrade the rating of the issuer of
the Portfolio  Insurance,  the  Municipal Obligations  insured  under  Portfolio
Insurance  issued  by such  insurer  also would  be  of reduced  quality  in the
portfolio of the Fund.
 
     Moody's, S&P and other NRSROs continually assess the claims-paying  ability
of  insurers and the  credit characteristics of insurers  and issuers, and there
can be no assurance that they will not downgrade their assessments subsequent to
the time  the Fund  purchases securities.  A description  of Moody's  and  S&P's
ratings  of insurance companies' claims-paying ability is included in Appendix A
to this SAI.
 
     Original Issue Insurance. Original  Issue Insurance typically is  purchased
from insurance companies, through payment of a single premium, with respect to a
particular issue of Municipal Obligations by the issuer thereof or a third party
(such  as the  underwriter) in  conjunction with  the original  issuance of such
Municipal Obligations. Under such insurance, the insurer unconditionally insures
to the  holder  of  the  insured Municipal  Obligation  the  timely  payment  of
principal and interest on such obligation when and as such payments shall become
due  but  shall not  be paid  by the  issuer, except  that in  the event  of any
acceleration of the due date of the principal by reason of mandatory or optional
redemption (other  than  acceleration by  reason  of a  mandatory  sinking  fund
payment), default or otherwise, the payments insured may be made in such amounts
and  at such times  as payments of principal  would have been  due had there not
been such acceleration. The  insurer is responsible for  such payments less  any
amounts  received by  the holder from  any trustee for  the Municipal Obligation
issuers or from any other source.
 
     In the  event that  interest  on or  principal  of a  Municipal  Obligation
covered by insurance is due for payment but is unpaid by reason of nonpayment by
the  issuer thereof,  the applicable  insurer will  make payments  to its fiscal
agent ( 'Fiscal Agent') equal to  such unpaid amounts of principal and  interest
not  later than one business  day after the insurer  has been notified that such
nonpayment has occurred (but not earlier than the date such payment is due). The
Fiscal Agent will  disburse to  the Fund the  amount of  principal and  interest
which  is then due for payment but is unpaid upon receipt by the Fiscal Agent of
(i) evidence  of the  Fund's right  to  receive payment  of such  principal  and
interest and (ii) evidence, including any appropriate instruments of assignment,
that  all of the  rights of payment of  such principal or  interest then due for
payment shall thereupon vest in the insurer. Upon payment by the insurer of  any
principal  or interest payments  with respect to  any Municipal Obligations, the
insurer will succeed to the rights of the Fund with respect to such payment.
 
     Original Issue  Insurance  remains  in  effect as  long  as  the  Municipal
Obligations  covered  thereby  remain  outstanding and  the  insurer  remains in
business, regardless of whether the  Fund ultimately disposes of such  Municipal
Obligations.  Consequently,  Original  Issue  Insurance  may  be  considered  to
represent an element of market value  with respect to the Municipal  Obligations
so insured, but the exact effect, if any, of this insurance on such market value
cannot be estimated.
 
     Secondary  Market Insurance. Subsequent to the time of original issuance of
a Municipal Obligation, the  Fund or a  third party may, upon  the payment of  a
single  premium,  purchase  insurance on  such  Municipal  Obligation. Secondary
Market Insurance generally provides the same type of coverage as is provided  by
Original  Issue Insurance  and, as  is the  case with  Original Issue Insurance,
Secondary  Market  Insurance  remains  in  effect  as  long  as  the   Municipal
Obligations  covered  thereby  remain  outstanding and  the  insurer  remains in
business, regardless of whether the  Fund ultimately disposes of such  Municipal
Obligations.  All premiums respecting Municipal  Obligations covered by Original
Issue Insurance or Secondary Market Insurance are paid in advance by the  issuer
or other party obtaining the insurance.
 
     One of the purposes of acquiring Secondary Market Insurance with respect to
a  particular Municipal Obligation  would be to  enable the Fund  to enhance the
value of  such  Municipal Obligation.  The  Fund,  for example,  might  seek  to
purchase a particular Municipal Obligation and obtain Secondary Market Insurance
with  respect thereto if, in the opinion  of Mitchell Hutchins, the market value
of such municipal security,  as insured, would exceed  the current value of  the
Municipal  Obligation without  insurance plus the  cost of  the Secondary Market
Insurance. Similarly, if the Fund owns but wishes to sell a Municipal Obligation
that is  then covered  by Portfolio  Insurance, the  Fund might  seek to  obtain
Secondary  Market Insurance with respect thereto  if, in the opinion of Mitchell
Hutchins, the net
 
                                       3
 

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<PAGE>
proceeds of a sale by the Fund of such obligation, as insured, would exceed  the
current  value  of  such  obligation  plus  the  cost  of  the  Secondary Market
Insurance.
 
     Portfolio Insurance. The Fund currently intends to emphasize investments in
Municipal Obligations that  have Original  Issue Insurance  or Secondary  Market
Insurance.  However, the  Fund may  purchase one  or more  policies of Portfolio
Insurance, each of which would insure  the payment of principal and interest  on
specified  eligible  Municipal  Obligations  purchased by  the  Fund.  Except as
described below,  Portfolio  Insurance  generally  provides  the  same  type  of
coverage  as  is  provided  by  Original  Issue  Insurance  or  Secondary Market
Insurance. Municipal Obligations  insured under one  Portfolio Insurance  policy
generally  would not  be insured  under any other  policy purchased  by the Fund
unless the Fund intended  to purchase Secondary  Market Insurance to  facilitate
sale of particular Municipal Obligations. A Municipal Obligation is eligible for
coverage  under  a  policy if  it  meets  certain requirements  of  the insurer.
Portfolio Insurance is intended to reduce  financial risk, but the cost  thereof
and compliance with investment restrictions imposed under the policy will reduce
the yield to Common Stockholders of the Fund.
 
     Portfolio Insurance policies are effective only as to Municipal Obligations
owned and held by the Fund, and do not cover Municipal Obligations for which the
contract  for  purchase  of  such Municipal  Obligation  fails.  A 'when-issued'
Municipal Obligation will be covered under a Portfolio Insurance policy upon the
settlement date of the issue of such 'when-issued' Municipal Obligation.
 
     In determining whether to insure Municipal Obligations held by the Fund, an
insurer will apply  its own  standards, which  would be  expected to  correspond
generally  to the standards it has  established for determining the insurability
of new issues of Municipal Obligations. See 'Original Issue Insurance' above.
 
     Any  Portfolio   Insurance   policy  purchased   by   the  Fund   will   be
non-cancellable  and will remain in effect so  long as the Fund is in existence,
the Municipal Obligations covered by the policy continue to be held by the Fund,
and the  Fund pays  the premiums  for the  policy. Each  insurer generally  will
reserve the right at any time upon 90 days' written notice to the Fund to refuse
to  insure any additional  securities purchased by the  Fund after the effective
date of such notice. The board of  directors of the Fund generally will  reserve
the right to terminate each policy upon seven days' written notice to an insurer
if  it determines that the cost of such  policy is not reasonable in relation to
the value of the insurance to the Fund.
 
     Each  Portfolio  Insurance  policy  will  terminate  as  to  any  Municipal
Obligation  that has been redeemed from or sold  by the Fund on the date of such
redemption or the settlement date of such sale, and an insurer will not have any
liability thereafter under a policy as to any such Municipal Obligation,  except
that  if the date of such redemption or  the settlement date of such sale occurs
after a record date and before the related payment date with respect to any such
Municipal Obligation, the policy will terminate as to such Municipal  Obligation
on  the business day  immediately following such payment  date. Each policy will
terminate as to all Municipal Obligations  covered thereby on the date on  which
the  last of the covered Municipal Obligations  mature, are redeemed or are sold
by the Fund.
 
     One or more policies of Portfolio Insurance may provide the Fund,  pursuant
to  an irrevocable commitment  of the insurer,  with the option  to exercise the
right to  obtain permanent  insurance ('Permanent  Insurance') (which  would  be
Secondary Market Insurance) with respect to a Municipal Obligation that is to be
sold  by  the  Fund. The  Fund  would  exercise the  right  to  obtain Permanent
Insurance upon payment of a single, predetermined insurance premium payable from
the proceeds of the sale of such  Municipal Obligation. It is expected that  the
Fund  would exercise  the right  to obtain  Permanent Insurance  for a Municipal
Obligation, only if, in the opinion of Mitchell Hutchins, upon such exercise the
net proceeds from the  sale by the  Fund of such  obligation, as insured,  would
exceed  the proceeds  from the  sale of  such obligation  without insurance. The
Permanent Insurance premium with respect  to each such obligation is  determined
based  upon the insurability of each such  obligation as of the date of purchase
by the  Fund and  will not  be  increased or  decreased for  any change  in  the
creditworthiness  of such obligation unless such  obligation is in default as to
payment of  principal  or  interest,  or both.  In  such  event,  the  Permanent
Insurance  premium shall be subject to an  increase predetermined at the date of
purchase by the Fund.
 
                                       4
 

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<PAGE>
     Because each  Portfolio Insurance  policy will  terminate as  to  Municipal
Obligations  sold by the  Fund on the date  of sale, in  which event the insurer
will be liable only for those payments  of principal and interest that are  then
due  and  owing  (unless  Permanent  Insurance is  obtained  by  the  Fund), the
provision for this insurance  will not enhance  the marketability of  securities
held  by the Fund. The  Fund generally intends to  retain any insured securities
covered by Portfolio  Insurance that are  in default or  in significant risk  of
default.  To the extent that the Fund holds such defaulted securities, it may be
limited in its ability to manage its investment portfolio and to purchase  other
Municipal  Obligations. On  the other hand,  since Original  Issue Insurance and
Secondary  Market  Insurance  will  remain  in  effect  as  long  as   Municipal
Obligations  covered  thereby are  outstanding, such  insurance may  enhance the
marketability of such securities even when such securities are in default or  in
significant  risk of default, but the exact effect, if any, on the marketability
cannot  be  estimated.  Accordingly,  the  Fund  may  determine  to  retain  or,
alternatively, to sell Municipal Obligations covered by Original Issue Insurance
or  Secondary Market  Insurance that  are in default  or in  significant risk of
default.
 
     It is anticipated that certain of the Municipal Obligations to be purchased
by the Fund will be  insured under policies obtained  by persons other than  the
Fund.  In instances  in which the  Fund purchases  Municipal Obligations insured
under policies obtained by persons  other than the Fund,  the Fund does not  pay
the  premiums  for  such policies;  rather  the  cost of  such  policies  may be
reflected  in  a   higher  purchase  price   for  such  Municipal   Obligations.
Accordingly,  the yield on such Municipal Obligations  may be lower than that on
similar uninsured  Municipal Obligations.  Premiums  for a  Portfolio  Insurance
policy  generally would be paid by the  Fund monthly, and adjusted for purchases
and sales of Municipal Obligations covered  by the policy during the month.  The
yield on the Fund's portfolio is reduced to the extent of the insurance premiums
paid  by the Fund  which, in turn,  will depend upon  the characteristics of the
covered Municipal Obligations held by  the Fund. In the  event the Fund were  to
purchase  Secondary Market Insurance  with respect to  any Municipal Obligations
then covered by a Portfolio Insurance policy, the coverage and the obligation of
the Fund  to  pay monthly  premiums  under such  policy  would cease  with  such
purchase.
 
WHEN-ISSUED AND DELAYED DELIVERY SECURITIES
 
     As stated in the Prospectus, the Fund may purchase Municipal Obligations on
a  when-issued basis, or may purchase  or sell Municipal Obligations for delayed
delivery. A security  purchased on a  when-issued or delayed  delivery basis  is
recorded  as an asset on the commitment date and is subject to changes in market
value, generally  based upon  changes  in the  level  of interest  rates.  Thus,
fluctuations  in the value of the security  from the time of the commitment date
will affect  the Fund's  net asset  value.  When the  Fund commits  to  purchase
securities  on a when-issued  or delayed delivery basis,  its custodian will set
aside in a segregated account cash or liquid securities with a value, marked  to
market  daily,  not  less  than  the amount  of  the  commitment.  If necessary,
additional assets will be placed in the  account daily so that the value of  the
account will equal or exceed the amount of the Fund's purchase commitment.
 
STAND-BY COMMITMENTS
 
     The  Fund  may acquire  'stand-by  commitments' with  respect  to Municipal
Obligations it purchases or holds. Under a stand-by commitment, which  resembles
a  put option, a broker, dealer or bank is obligated to repurchase at the Fund's
option specified securities at a specified price. The Fund's ability to exercise
a stand-by commitment is subject to the ability of the seller to make payment on
demand.  The  Fund  will  acquire  stand-by  commitments  solely  to  facilitate
liquidity and does not intend to exercise the rights afforded by the commitments
for  trading purposes.  The Fund anticipates  that stand-by  commitments will be
available from brokers, dealers, and banks without the payment of any direct  or
indirect  consideration. The Fund may pay for stand-by commitments if payment is
deemed necessary,  thus  increasing to  a  degree  the cost  of  the  underlying
Municipal Obligation and similarly decreasing the obligation's yield.
 
     The  Fund would  enter into stand-by  commitments only  with those brokers,
banks or dealers  that, in  the opinion  of Mitchell  Hutchins, present  minimal
credit  risks.  The  Fund's  right to  exercise  stand-by  commitments  would be
unconditional  and   unqualified.   A   stand-by   commitment   would   not   be
 
                                       5
 

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<PAGE>
transferable by the Fund, although the Fund could sell the underlying securities
to a third party at any time. The acquisition of a stand-by commitment would not
ordinarily  affect  the  valuation  or  maturity  of  the  underlying  Municipal
Obligations.
 
REPURCHASE AGREEMENTS AND REVERSE REPURCHASE AGREEMENTS
 
   
     The Fund is authorized to enter into repurchase agreements with respect  to
any  obligation issued  or guaranteed  by the  U.S. government,  its agencies or
instrumentalities and also with respect  to commercial paper, bank  certificates
of  deposit and bankers' acceptances.  Repurchase agreements are transactions in
which the Fund would  purchase securities from a  bank or recognized  securities
dealer  and  simultaneously commit  to resell  those securities  to the  bank or
dealer at an agreed-upon date or upon demand and at a price reflecting a  market
rate  of interest  unrelated to  the coupon  rate or  maturity of  the purchased
securities. The Fund would maintain  custody of the underlying securities  prior
to  their repurchase; thus, the  obligation of the bank  or securities dealer to
pay the repurchase price on the date  agreed to would, in effect, be secured  by
such  securities. If the value of such  securities were less than the repurchase
price, plus any agreed-upon additional amount, the other party to the  agreement
would  be required  to provide  additional collateral so  that at  all times the
collateral is  at least  equal to  the repurchase  price, plus  any  agreed-upon
additional  amount. The difference between the  total amount to be received upon
repurchase of the  securities and  the price  which was  paid by  the Fund  upon
acquisition  would  be  accrued  as  interest and  included  in  the  Fund's net
investment income.
    
 
     Repurchase agreements  carry  certain  risks  not  associated  with  direct
investments  in securities, including  possible declines in  the market value of
the underlying securities and delays and costs to the Fund if the other party to
the repurchase  agreement becomes  insolvent.  The Fund  intends to  enter  into
repurchase  agreements only with  banks and dealers  in transactions believed by
Mitchell Hutchins to present minimal credit risks in accordance with  guidelines
established  by the Fund's board of directors. Mitchell Hutchins will review and
monitor the  creditworthiness of  such institutions  under the  board's  general
supervision.
 
   
     The  Fund may also  enter into reverse repurchase  agreements with the same
parties with  whom it  may enter  into repurchase  agreements. Under  a  reverse
repurchase  agreement, the  Fund would sell  securities and  agree to repurchase
(and the buyer would be  required to resell) them at  a mutually agreed date  or
upon demand and at a price reflecting a market rate of interest unrelated to the
coupon rate or maturity of the purchased securities. At the time the Fund enters
into a reverse repurchase agreement, it will establish and maintain a segregated
account with an approved custodian containing cash or liquid securities having a
value,  marked to  market daily, not  less than the  repurchase price (including
accrued interest). The market value of securities sold under reverse  repurchase
agreements  typically is greater than the proceeds of the sale, and accordingly,
the market value of the securities sold  is likely to be greater than the  value
of  the  securities in  which  the Fund  invests  those proceeds.  Thus, reverse
repurchase agreements involve the risk that the buyer of the securities sold  by
the  Fund might be unable to deliver them  when the Fund seeks to repurchase. In
the event the buyer of securities under a reverse repurchase agreement files for
bankruptcy or  becomes insolvent,  such buyer  or its  trustee or  receiver  may
receive  an  extension  of  time  to determine  whether  to  enforce  the Fund's
obligation to repurchase the securities, and  the Fund's use of the proceeds  of
the  reverse  repurchase agreement  may effectively  be restricted  pending such
decision.
    
 
     Reverse repurchase agreements will be treated as borrowings for purposes of
calculating the  Fund's  borrowing  limitation. In  addition  to  the  foregoing
borrowings, the Fund may borrow money for emergency or temporary purposes (e.g.,
clearance  of transactions, share repurchases or tender offers) in an amount not
exceeding 5% of the value of the  Fund's total assets (not including the  amount
borrowed). See 'Investment Limitations.'
 
ILLIQUID SECURITIES
 
     As noted in the Prospectus, the Fund may invest up to 20% of its net assets
in  illiquid securities.  The board of  directors has delegated  the function of
making day-to-day determinations of liquidity to Mitchell Hutchins, pursuant  to
guidelines   approved  by  the  board.  Mitchell  Hutchins  takes  into  account
 
                                       6
 

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<PAGE>
a number  of  factors  in  reaching  liquidity  decisions,  including:  (1)  the
frequency of trades for the security; (2) the number of dealers that make quotes
for  the security;  (3) the  number of  dealers that  have undertaken  to make a
market in the security;  (4) the number of  other potential purchasers; and  (5)
the nature of the security and how trading is effected (e.g., the time needed to
sell  the security,  how offers  are solicited  and the  mechanics of transfer).
Mitchell Hutchins monitors the liquidity  of securities in the Fund's  portfolio
and reports periodically on liquidity decisions to the board of directors.
 
     In   making  determinations  as   to  the  liquidity   of  municipal  lease
obligations, Mitchell Hutchins  will distinguish between  direct investments  in
municipal  lease  obligations  (or participations  therein)  and  investments in
securities that may be supported by municipal lease obligations or  certificates
of   participation  therein.  Since   these  municipal  lease  obligation-backed
securities are based  on a  well-established means  of securitization,  Mitchell
Hutchins  does not believe  that investing in such  securities presents the same
liquidity issues  as  direct investments  in  municipal lease  obligations.  The
assets used as cover for any OTC options written by the Fund would be considered
illiquid unless the OTC options are sold to qualified dealers who agree that the
Fund may repurchase any OTC option it writes at a maximum price to be calculated
by  a formula  set forth in  the option agreement.  The cover for  an OTC option
written subject to this procedure will be considered illiquid only to the extent
that the maximum repurchase price under the formula exceeds the intrinsic  value
of the option.
 
SHORT SALES 'AGAINST THE BOX'
 
     The  Fund may engage in short sales of  securities it owns or has the right
to acquire at no added cost  through conversion or exchange of other  securities
it  owns (short sales 'against the box'). A  short sale is effected by selling a
security and having  the executing broker  borrow the securities  being sold  on
behalf  of the Fund. The Fund is obligated to replace the borrowed securities at
a date in  the future. When  the Fund sells  short, it will  establish a  margin
account  with the  broker effecting the  short sale and  will deposit collateral
with the broker. In addition,  the Fund will maintain  with its custodian, in  a
segregated  account, the securities that could be  used to cover the short sale.
The Fund will incur transaction costs, including interest expense, in connection
with opening, maintaining  and closing  short sales  against the  box. The  Fund
currently does not intend to have obligations under short sales that at any time
during the coming year exceed 5% of the Fund's net assets.
 
     The  Fund  might make  a short  sale 'against  the box'  in order  to hedge
against market  risks  when Mitchell  Hutchins  believes  that the  price  of  a
security may decline, thereby causing a decline in the value of a security owned
by  the Fund or a security convertible into or exchangeable for a security owned
by the Fund, or when  Mitchell Hutchins wants to sell  a security that the  Fund
owns  at a current price,  but also wishes to defer  recognition of gain or loss
for federal income  tax purposes.  In such  case, any  loss in  the Fund's  long
position after the short sale should be reduced by a gain in the short position.
Conversely,  any gain in  the long position should  be reduced by  a loss in the
short position. The extent  to which gains  or losses in  the long position  are
reduced will depend upon the amount of the securities sold short relative to the
amount  of the securities the  Fund owns, either directly  or indirectly, and in
the case where the Fund owns  convertible securities, changes in the  investment
values or conversion premiums of such securities.
 
INVESTMENT LIMITATIONS
 
     The  following fundamental investment limitations cannot be changed without
the affirmative vote  of the  lesser of  (a) more  than 50%  of the  outstanding
shares  of the Fund or (b) 67% or more of such shares present at a stockholders'
meeting if  more than  50% of  the  outstanding shares  are represented  at  the
meeting  in person or by proxy. If a percentage restriction is adhered to at the
time of an investment or transaction, a later increase or decrease in percentage
resulting from a change in values of portfolio securities or the amount of total
assets will not be considered a violation of any of the following limitations or
of any of the Fund's investment policies. The Fund will not:
 
          (1) purchase securities of any one  issuer if, as a result, more  than
     5%  of the  Fund's total  assets would  be invested  in securities  of that
     issuer or the  Fund would  own or  hold more  than 10%  of the  outstanding
     voting securities of that issuer, except that up to 25% of the Fund's total
     assets may be
 
                                       7
 

<PAGE>
<PAGE>
     invested without regard to this limitation, and except that this limitation
     does  not apply to securities issued  or guaranteed by the U.S. government,
     its agencies  and  instrumentalities  or  to  securities  issued  by  other
     investment companies.
 
          (2)  purchase any security  if, as a  result of that  purchase, 25% or
     more of the Fund's total assets would be invested in securities of  issuers
     having  their principal  business activities  in the  same industry, except
     that this limitation does not apply  to securities issued or guaranteed  by
     the  U.S.  government, its  agencies or  instrumentalities or  to municipal
     securities.
 
          (3) issue senior securities (including borrowing money from banks  and
     other  entities and through reverse  repurchase agreements), except (a) the
     Fund may borrow  in an  amount not  in excess of  33 1/3%  of total  assets
     (including  the  amount of  senior securities  issued,  but reduced  by any
     liabilities and indebtedness not  constituting senior securities), (b)  the
     Fund may issue preferred stock having a liquidation preference in an amount
     which,  combined  with  the  amount  of  any  liabilities  or  indebtedness
     constituting senior securities, is not in excess of 50% of its total assets
     (computed as provided in clause (a) above)  and (c) the Fund may borrow  up
     to an additional 5% of its total assets (not including the amount borrowed)
     for temporary or emergency purposes.
 
          (4)  make  loans,  except  through loans  of  portfolio  securities or
     through  repurchase  agreements,  provided   that  for  purposes  of   this
     restriction, the acquisition of bonds, debentures, other debt securities or
     instruments,  or participations or other  interests therein and investments
     in government  obligations,  commercial  paper,  certificates  of  deposit,
     bankers'  acceptances  or similar  instruments will  not be  considered the
     making of a loan.
 
          (5) engage  in  the  business  of  underwriting  securities  of  other
     issuers,  except  to  the  extent  that the  Fund  might  be  considered an
     underwriter under  the  federal  securities laws  in  connection  with  its
     disposition of portfolio securities.
 
          (6)   purchase  or  sell  real  estate,  except  that  investments  in
     securities of  issuers  that  invest  in real  estate  and  investments  in
     mortgage-backed  securities, mortgage  participations or  other instruments
     supported by interests in real estate  are not subject to this  limitation,
     and  except that the Fund may  exercise rights under agreements relating to
     such securities, including the right  to enforce security interests and  to
     hold  real estate  acquired by reason  of such enforcement  until that real
     estate can be liquidated in an orderly manner.
 
          (7) purchase or sell physical commodities unless acquired as a  result
     of  owning securities or other instruments, but the Fund may purchase, sell
     or enter  into financial  options and  futures, forward  and spot  currency
     contracts,  swap transactions  and other financial  contracts or derivative
     instruments.
 
               The following interpretation applies  to, but is  not a part  of,
               fundamental limitation (1):
 
               Each  state (including the District of Columbia and Puerto Rico),
               territory and  possession of  the United  States, each  political
               subdivision,  agency, instrumentality and  authority thereof, and
               each multi-state  agency  of which  a  state  is a  member  is  a
               separate  'issuer.' When  the assets  and revenues  of an agency,
               authority, instrumentality  or  other political  subdivision  are
               separate  from the  government creating  the subdivision  and the
               security is  backed  only  by  the assets  and  revenues  of  the
               subdivision,  such  subdivision would  be deemed  to be  the sole
               issuer. Similarly, in the case of an Industrial Development  Bond
               or  Private Activity  Bond, if  that bond  is backed  only by the
               assets and  revenues  of  the non-governmental  user,  then  that
               non-governmental  user  would be  deemed to  be the  sole issuer.
               However, if the creating government or another entity  guarantees
               a  security, then to the extent  that the value of all securities
               issued or guaranteed by  that government or  entity and owned  by
               the  Fund exceeds 10%  of the Fund's  total assets, the guarantee
               would be considered a separate  security and would be treated  as
               issued  by that government  or entity. This  restriction does not
               limit the percentage of the Fund's assets that may be invested in
               Municipal Obligations insured by any given insurer.
 
     The following  investment  restrictions  are not  fundamental  and  may  be
changed by the Fund's board of directors without shareholder approval.
 
                                       8
 

<PAGE>
<PAGE>
     The Fund will not:
 
          (1)  purchase  securities  on  margin,  except  for  short-term credit
     necessary for clearance of portfolio transactions and except that the  Fund
     may  make margin deposits  in connection with its  use of financial options
     and futures, forward  and spot  currency contracts,  swap transactions  and
     other financial contracts or derivative instruments.
 
          (2)  engage in short sales of securities or maintain a short position,
     except that the Fund may (a) sell short 'against the box' and (b)  maintain
     short  positions  in  connection  with its  use  of  financial  options and
     futures, forward and spot currency  contracts, swap transactions and  other
     financial contracts or derivative instruments.
 
   
                     HEDGING AND RELATED INCOME STRATEGIES
    
 
     As  discussed in  the Prospectus,  Mitchell Hutchins  may use  a variety of
financial  instruments  ('Hedging  Instruments'),  including  certain   options,
futures  contracts  (sometimes referred  to  as 'futures'),  options  on futures
contracts and interest  rate protection  transactions, to attempt  to hedge  the
Fund's  portfolio and may use  options to attempt to  enhance the Fund's income.
The  Fund  may  enter  into  options,  futures  and  interest  rate   protection
transactions  that  approximate  (but  do  not exceed)  the  full  value  of its
portfolio. Any income  realized from  the use of  options and  futures would  be
taxable to stockholders.
 
   
     In  addition, rating  agency guidelines  impose restrictions  on the Fund's
ability to invest in Hedging Instruments. For as long as shares of any series of
APS are rated  by Moody's, the  Fund may  engage in transactions  in options  on
securities, futures contracts based on the Municipal Index or Treasury Bonds and
options  on such futures contracts (collectively 'Moody's Hedging Transactions')
only when consistent with the provisions  set forth under 'Appendix B --  Rating
Agency  Guidelines,' unless it  receives written confirmation  from Moody's that
engaging in such transactions will not  impair the ratings then assigned to  the
APS by Moody's. For as long as shares of any series of APS are rated by S&P, the
Fund  will not  buy or sell  futures contracts  or options thereon  or write put
options or call  options on  portfolio securities  or enter  into interest  rate
caps,  collars or floors  unless it receives written  confirmation from S&P that
engaging in such transactions will not  impair the ratings then assigned to  the
APS  by S&P, except that the Fund may buy or sell futures contracts based on the
Municipal Index or  Treasury Bonds, may  purchase put and  call options on  such
contracts  and  may  write  covered  call options  and  secured  put  options on
portfolio securities (collectively  'S&P Hedging Transactions')  subject to  the
limitations described under 'Appendix B -- Rating Agency Guidelines.'
    
 
     Hedging  strategies can be broadly categorized  as 'short hedges' and 'long
hedges.' A short hedge is a purchase or sale of a Hedging Instrument intended to
partially or  fully  offset potential  declines  in the  value  of one  or  more
investments  held in the Fund's portfolio. Thus, in a short hedge the Fund takes
a position in a Hedging Instrument the price of which is expected to move in the
opposite direction of the price of the investment being hedged. For example, the
Fund might purchase  a put option  on a  security to hedge  against a  potential
decline  in the value  of that security.  If the price  of the security declined
below the exercise price of  the put, the Fund could  exercise the put and  thus
limit  its loss below  the exercise price  to the premium  paid plus transaction
costs. In the alternative, because the value  of the put option can be  expected
to  increase as the value of the underlying security declines, the Fund might be
able to close out the put option and realize a gain to offset the decline in the
value of the security.
 
     Conversely, a long  hedge is  a purchase or  sale of  a Hedging  Instrument
intended  partially or  fully to offset  potential increases  in the acquisition
cost of one or  more investments that  the Fund intends to  acquire. Thus, in  a
long  hedge the Fund takes a position in a Hedging Instrument the price of which
is expected  to move  in the  same direction  as the  price of  the  prospective
investment being hedged. For example, the Fund might purchase a call option on a
security  it intends to  purchase in order  to hedge against  an increase in the
cost of the security. If the price of the security increased above the  exercise
price  of  the  call,  the Fund  could  exercise  the call  and  thus  limit its
acquisition cost to  the exercise price  plus the premium  paid and  transaction
costs.  Alternatively, the Fund  might be able  to offset the  price increase by
closing out an appreciated call option and realizing a gain.
 
                                       9
 

<PAGE>
<PAGE>
     Hedging Instruments on securities generally are used to hedge against price
movements in one or more particular  securities positions that the Fund owns  or
intends  to acquire. Hedging Instruments on debt securities may be used to hedge
either individual securities or broad fixed income market sectors.
 
   
     The use of Hedging Instruments is subject to applicable regulations of  the
SEC,  the several options and  futures exchanges upon which  they are traded and
the Commodity  Futures  Trading Commission  ('CFTC').  In addition,  the  Fund's
ability  to use Hedging  Instruments will be limited  by tax considerations. See
'Taxes.'
    
 
     In addition to the products, strategies and risks described below, Mitchell
Hutchins expects additional opportunities to develop in connection with options,
futures contracts  and other  hedging techniques.  These new  opportunities  may
become  available as  Mitchell Hutchins  develops new  techniques, as regulatory
authorities broaden  the range  of permitted  transactions and  as new  options,
futures  contracts  or other  techniques  are developed.  Mitchell  Hutchins may
utilize these opportunities  to the  extent that  they are  consistent with  the
Fund's  investment objective and permitted  by the Fund's investment limitations
and applicable regulatory authorities.
 
SPECIAL RISKS OF HEDGING STRATEGIES
 
     The use of Hedging Instruments  involves special considerations and  risks,
as  described  below. Risks  pertaining  to particular  Hedging  Instruments are
described in the sections that follow.
 
     (1) Successful  use  of  most Hedging  Instruments  depends  upon  Mitchell
Hutchins'  ability to predict  movements of the  overall securities and interest
rate markets, which  requires different  skills than predicting  changes in  the
prices  of individual securities. While Mitchell  Hutchins is experienced in the
use of  Hedging Instruments,  there  can be  no  assurance that  any  particular
hedging strategy adopted will succeed.
 
     (2)  There might be imperfect correlation,  or even no correlation, between
price movements of a Hedging Instrument  and price movements of the  investments
being  hedged. For example, if the value of a Hedging Instrument used in a short
hedge increased by less than the decline in value of the hedged investment,  the
hedge  would not be fully successful. Such a lack of correlation might occur due
to factors  unrelated to  the value  of the  investments being  hedged, such  as
speculative  or other pressures on the  markets in which Hedging Instruments are
traded. The effectiveness of  hedges using Hedging  Instruments on indexes  will
depend  on the degree  of correlation between  price movements in  the index and
price movements in the securities being hedged.
 
     (3) Hedging strategies, if successful, can reduce risk of loss by wholly or
partially offsetting the negative effect  of unfavorable price movements in  the
investments   being  hedged.   However,  hedging  strategies   can  also  reduce
opportunity for  gain  by offsetting  the  positive effect  of  favorable  price
movements  in the hedged  investments. For example,  if the Fund  entered into a
short hedge because  Mitchell Hutchins  projected a decline  in the  price of  a
security  in  the Fund's  portfolio, and  the price  of that  security increased
instead, the gain from that  increase might be wholly  or partially offset by  a
decline  in the price of  the Hedging Instrument. Moreover,  if the price of the
Hedging Instrument  declined by  more than  the  increase in  the price  of  the
security, the Fund could suffer a loss. In either such case, the Fund would have
been in a better position had it not hedged at all.
 
     (4)  As described below, the  Fund might be required  to maintain assets as
'cover,' maintain  segregated accounts  or make  margin payments  when it  takes
positions  in Hedging Instruments involving  obligations to third parties (i.e.,
Hedging Instruments other than  purchased options). If the  Fund were unable  to
close  out its positions  in such Hedging  Instruments, it might  be required to
continue to maintain  such assets or  accounts or make  such payments until  the
position  expired or matured. These requirements might impair the Fund's ability
to sell a  portfolio security  or make  an investment at  a time  when it  would
otherwise  be favorable  to do  so, or  require that  the Fund  sell a portfolio
security at a disadvantageous time. The  Fund's ability to close out a  position
in a Hedging Instrument prior to expiration or maturity depends on the existence
of  a liquid secondary market  or, in the absence of  such a market, the ability
and willingness of a contra  party to enter into  a transaction closing out  the
position.  Therefore, there  is no  assurance that  any hedging  position can be
closed out at a time and price that is favorable to the Fund.
 
                                       10
 

<PAGE>
<PAGE>
COVER FOR HEDGING STRATEGIES
 
   
     Transactions using  Hedging  Instruments,  other  than  purchased  options,
expose  the Fund to an obligation to another party. The Fund will not enter into
any such  transactions  unless it  owns  either (1)  an  offsetting  ('covered')
position  in securities  or other  options or futures  contracts or  (2) cash or
liquid securities, with a value sufficient  at all times to cover its  potential
obligations  to the extent not  covered as provided in  (1) above. The Fund will
comply with SEC guidelines regarding cover for hedging transactions and will, if
the guidelines so require, set aside  cash or liquid securities in a  segregated
account with its custodian in the prescribed amount, marked to market daily.
    
 
     Assets  used as cover or held in  a segregated account cannot be sold while
the position in the  corresponding Hedging Instrument is  open, unless they  are
replaced  with similar assets. As a result, the commitment of a large portion of
the Fund's  assets  to  cover  or segregated  accounts  could  impede  portfolio
management  or the Fund's  ability to meet redemption  requests or other current
obligations.
 
OPTIONS
 
     The Fund may purchase put and  call options, and write (sell) covered  call
options  and  covered put  options,  on debt  securities.  The purchase  of call
options serves as  a long hedge,  and the purchase  of put options  serves as  a
short  hedge. Writing covered put or call options can enable the Fund to enhance
income by  reason  of the  premiums  paid by  the  purchasers of  such  options.
However,  if the market  price of the  security underlying a  covered put option
declines to  less than  the exercise  price  on the  option, minus  the  premium
received,  the Fund would expect to suffer  a loss. Writing covered call options
serves as a limited  short hedge, because  declines in the  value of the  hedged
investment would be offset to the extent of the premium received for writing the
option. However, if the security appreciates to a price higher than the exercise
price  of the call option, it can be  expected that the option will be exercised
and the Fund  will be obligated  to sell the  security at less  than its  market
value.  If the  covered call option  is an  OTC option, the  securities or other
assets used as cover would be considered illiquid to the extent described  under
'Investment Policies and Restrictions -- Illiquid Securities.'
 
     The  value  of an  option position  will reflect,  among other  things, the
current market  value of  the underlying  investment, the  time remaining  until
expiration,  the relationship of the  exercise price to the  market price of the
underlying  investment,  the  historical  price  volatility  of  the  underlying
investment and general market conditions. Options normally have expiration dates
of up to nine months. Options that expire unexercised have no value.
 
     The  Fund may effectively terminate its right or obligation under an option
by entering into a closing transaction. For example, the Fund may terminate  its
obligation  under a call option  that it had written  by purchasing an identical
call option; this is  known as a closing  purchase transaction. Conversely,  the
Fund  may terminate  a position  in a  put or  call option  it had  purchased by
writing an  identical put  or  call option;  this is  known  as a  closing  sale
transaction.  Closing transactions permit  the Fund to  realize profits or limit
losses on an option position prior to its exercise or expiration.
 
     The Fund  may  purchase or  write  both exchange-traded  and  OTC  options.
However,  exchange-traded or liquid OTC options on Municipal Obligations are not
currently available. Exchange-traded options in the United States are issued  by
a  clearing organization  affiliated with  the exchange  on which  the option is
listed which, in effect, guarantees  completion of every exchange-traded  option
transaction.  In contrast,  OTC options are  contracts between the  Fund and its
contra  party  (usually  a  securities  dealer  or  a  bank)  with  no  clearing
organization  guarantee. Thus, when the Fund  purchases or writes an OTC option,
it relies  on the  contra  party to  make or  take  delivery of  the  underlying
investment  upon exercise of  the option. Failure  by the contra  party to do so
would result in the loss of any premium paid by the Fund as well as the loss  of
any expected benefit of the transaction.
 
     Generally,  OTC options on debt securities are European style options. This
means that the option is only  exercisable immediately prior to its  expiration.
This is in contrast to American-style options, which are exercisable at any time
prior to the expiration date of the option.
 
     The  Fund's ability to establish and close out positions in exchange-listed
options depends  on  the existence  of  a liquid  market.  The Fund  intends  to
purchase  or write only those exchange-traded options for which there appears to
be a  liquid secondary  market. However,  there can  be no  assurance that  such
 
                                       11
 

<PAGE>
<PAGE>
a market will exist at any particular time. Closing transactions can be made for
OTC  options  only  by negotiating  directly  with  the contra  party,  or  by a
transaction in the secondary market if any such market exists. Although the Fund
will enter into OTC  options only with  contra parties that  are expected to  be
capable  of  entering  into closing  transactions  with  the Fund,  there  is no
assurance that the Fund will in fact be able to close out an OTC option position
at a favorable  price prior to  expiration. In  the event of  insolvency of  the
contra  party, the Fund might  be unable to close out  an OTC option position at
any time prior to its expiration.
 
     If the Fund were unable  to effect a closing  transaction for an option  it
had  purchased, it would have to exercise  the option to realize any profit. The
inability to enter into a closing purchase transaction for a covered call option
written by the Fund could cause material losses because the Fund would be unable
to sell the investment  used as cover  for the written  option until the  option
expires or is exercised.
 
     In  the event that  options on indexes of  municipal and non-municipal debt
securities become  available, the  Fund  may purchase  and  write put  and  call
options  on such indexes in much the same manner as the more traditional options
discussed above, except that index options may serve as a hedge against  overall
fluctuations  in  the debt  securities market  (or  market sectors)  rather than
anticipated increases or decreases in the value of a particular security.
 
FUTURES
 
     The Fund may purchase and sell municipal bond index futures, other interest
rate futures  and options  thereon.  The purchase  of  futures or  call  options
thereon  can serve as a long  hedge, and the sale of  futures or the purchase of
put options thereon can serve as a short hedge. Writing covered call options  on
futures  contracts can serve as a limited  short hedge, using a strategy similar
to that  used  for  writing  covered call  options  on  securities  or  indexes.
Similarly,  writing  covered put  options on  futures contracts  can serve  as a
limited long hedge.
 
   
     Futures strategies also can be used  to manage the average duration of  the
Fund's portfolio. If Mitchell Hutchins wishes to shorten the average duration of
the  Fund's portfolio,  the Fund may  sell a  futures contract or  a call option
thereon, or purchase a put option on that futures contract. If Mitchell Hutchins
wishes to lengthen the  average duration of the  Fund's portfolio, the Fund  may
buy a futures contract or a call option thereon, or sell a put option thereon.
    
 
   
     No  price is paid  upon entering into  a futures contract.  Instead, at the
inception of a futures contract the Fund is required to deposit in a  segregated
account  with its custodian, in the name  of the futures broker through whom the
transaction was effected,  'initial margin' consisting  of cash, obligations  of
the  United States or obligations that are  fully guaranteed as to principal and
interest by the United States,  in an amount generally equal  to 10% or less  of
the  contract value. Margin must also be deposited when writing a call option on
a futures contract, in accordance with applicable exchange rules. Unlike  margin
in  securities  transactions,  initial  margin  on  futures  contracts  does not
represent a borrowing,  but rather is  in the  nature of a  performance bond  or
good-faith  deposit  that is  returned to  the  Fund at  the termination  of the
transaction if all  contractual obligations have  been satisfied. Under  certain
circumstances,  such as periods of high volatility,  the Fund may be required by
an exchange to  increase the level  of its initial  margin payment, and  initial
margin  requirements might  be increased generally  in the  future by regulatory
action.
    
 
     Subsequent 'variation margin'  payments are  made to and  from the  futures
broker  daily as the  value of the  futures position varies,  a process known as
'marking to market.'  Variation margin  does not involve  borrowing, but  rather
represents  a daily settlement of the Fund's obligations with respect to an open
futures position. When  the Fund purchases  an option on  a future, the  premium
paid  plus transaction costs is all that is  at risk. In contrast, when the Fund
purchases or sells a  futures contract or  writes a call  option thereon, it  is
subject  to daily variation margin calls that  could be substantial in the event
of adverse price  movements. If  the Fund has  insufficient cash  to meet  daily
variation  margin requirements, it might need to  sell securities at a time when
such sales are disadvantageous.
 
     Holders and writers of futures positions  and options on futures can  enter
into  offsetting  closing  transactions,  similar  to  closing  transactions  on
options, by selling or purchasing, respectively, an instrument identical to  the
instrument  held or  written. Positions  in futures  and options  on futures may
 
                                       12
 

<PAGE>
<PAGE>
be closed  only on  an exchange  or board  of trade  that provides  a  secondary
market. The Fund intends to enter into futures transactions only on exchanges or
boards  of trade where there  appears to be a  liquid secondary market. However,
there can  be no  assurance  that such  a market  will  exist for  a  particular
contract  at a  particular time.  Secondary markets  for options  on futures are
currently in  the development  stage, and  the Fund  will not  trade options  on
futures on any exchange or board of trade unless, in Mitchell Hutchins' opinion,
the  markets for  such options  have developed  sufficiently that  the liquidity
risks for such options are not greater than the corresponding risks for futures.
 
     Under certain circumstances, futures  exchanges may establish daily  limits
on  the amount that  the price of a  future or related option  can vary from the
previous day's settlement price;  once that limit is  reached, no trades may  be
made  that day  at a  price beyond the  limit. Daily  price limits  do not limit
potential losses  because prices  could  move to  the  daily limit  for  several
consecutive  days with little  or no trading,  thereby preventing liquidation of
unfavorable positions.
 
     If the Fund were unable to liquidate a futures or related options  position
due  to the  absence of  a liquid  secondary market  or the  imposition of price
limits, it could incur substantial losses. The Fund would continue to be subject
to market risk with respect to the position. In addition, except in the case  of
purchased  options,  the  Fund  would  continue to  be  required  to  make daily
variation margin payments and might be  required to maintain the position  being
hedged by the future or option or to maintain cash or securities in a segregated
account.
 
     Certain  characteristics of the futures market might increase the risk that
movements in  the prices  of  futures contracts  or  related options  might  not
correlate  perfectly  with  movements in  the  prices of  the  investments being
hedged. For example, all participants in the futures and related options markets
are subject to daily variation margin calls and might be compelled to  liquidate
futures  or related  options positions  whose prices  are moving  unfavorably to
avoid being subject to  further calls. These  liquidations could increase  price
volatility  of the instruments and distort the normal price relationship between
the futures or options and the  investments being hedged. Also, because  initial
margin  deposit requirements in the futures  market are less onerous than margin
requirements in the securities markets,  there might be increased  participation
by  speculators  in the  futures markets.  This  participation also  might cause
temporary price distortions. In  addition, activities of  large traders in  both
the  futures and securities  markets involving arbitrage,  'program trading' and
other investment strategies might result in temporary price distortions.
 
GUIDELINE FOR FUTURES AND RELATED OPTIONS
 
   
     To the extent that  the Fund enters into  futures contracts and options  on
futures positions that are not for bona fide hedging purposes (as defined by the
CFTC),  the aggregate initial margin and  premiums on these positions (excluding
the amount by which options are 'in-the-money') may not exceed 5% of the  Fund's
net  assets. This  guideline may  be modified by  the Fund's  board of directors
without a stockholder vote. Adoption of  this guideline cannot be guaranteed  to
limit the percentage of the Fund's assets at risk to 5%.
    
 
The Fund may use the following hedging instruments:
 
     OPTIONS ON DEBT SECURITIES -- A call option is a contract pursuant to which
the  purchaser of the option, in return for  a premium, has the right to buy the
security underlying the option at a specified price at any time during the term,
or upon  the expiration,  of the  option. The  writer of  the call  option,  who
receives  the  premium, has  the  obligation, upon  exercise  of the  option, to
deliver the underlying  security against payment  of the exercise  price. A  put
option is a similar contract which gives its purchaser, in return for a premium,
the right to sell the underlying security at a specified price during the option
term or upon expiration. The writer of the put option, who receives the premium,
has  the  obligation,  upon exercise,  to  buy  the underlying  security  at the
exercise price.  Options on  debt securities  are traded  primarily in  the  OTC
market rather than on any of the several options exchanges.
 
     OPTIONS  ON INDEXES OF DEBT SECURITIES  -- An index assigns relative values
to the  securities included  in the  index and  fluctuates with  changes in  the
market  values of such securities. Index options operate in the same way as more
traditional options except  that exercises  of index options  are effected  with
cash  payments and do not involve delivery of securities. Thus, upon exercise of
an index option, the
 
                                       13
 

<PAGE>
<PAGE>
purchaser will  realize  and  the  writer  will pay,  an  amount  based  on  the
difference between the exercise price and the closing price of the index.
 
     MUNICIPAL  BOND INDEX FUTURES  CONTRACTS -- A  municipal bond index futures
contract is a bilateral agreement pursuant  to which one party agrees to  accept
and  the other party  agrees to make  delivery of an  amount of cash  equal to a
specified dollar amount  times the  difference between  the index  value at  the
close  of trading of the contract and the price at which the futures contract is
originally struck. No  physical delivery of  the bonds comprising  the index  is
made;  generally contracts are  closed out prior  to the expiration  date of the
contract.
 
     MUNICIPAL DEBT AND INTEREST RATE FUTURES  CONTRACTS -- A municipal debt  or
interest  rate futures contract  is a bilateral agreement  pursuant to which one
party agrees  to accept  and the  other party  agrees to  make delivery  of  the
specific  type of debt security called for in the contract at a specified future
time and at a  specified price. Although such  futures contracts by their  terms
call  for actual delivery  or acceptance of  debt securities, in  most cases the
contracts are closed out before the settlement date without making or taking  of
delivery.
 
     OPTIONS ON FUTURES CONTRACTS -- Options on futures contracts are similar to
options  on securities  except that  an option on  a futures  contract gives the
purchaser the  right, in  return for  the premium,  to assume  a position  in  a
futures  contract (a long position if the option  is a call and a short position
if the option  is a  put), rather  than to  purchase or  sell a  security, at  a
specified price at any time during the option term. Upon exercise of the option,
the  delivery  of the  futures  position to  the holder  of  the option  will be
accompanied by delivery of the accumulated balance, which represents the  amount
by  which the  market price of  the futures contract  exceeds, in the  case of a
call, or is less than, in the case of a put, the exercise price of the option on
the future. The writer of an option, upon exercise, will assume a short position
in the case of a call, and a long position in the case of put.
 
     INTEREST RATE PROTECTION TRANSACTIONS --  The Fund may enter into  interest
rate  protection transactions, including  interest rate swaps  and interest rate
caps, collars and floors. Interest  rate swap transactions involve an  agreement
between  two  parties  to exchange  payments  that  are based,  for  example, on
variable and fixed rates of interest and  that are calculated on the basis of  a
specified  amount of principal (the 'notional principal amount') for a specified
period of time. Interest  rate cap and floor  transactions involve an  agreement
between  two parties  in which the  first party  agrees to make  payments to the
counterparty when a designated market interest rate goes above (in the case of a
cap) or below (in the case of a floor) a designated level on predetermined dates
or during a specified time period. Interest rate collar transactions involve  an
agreement  between  two parties  in which  payments are  made when  a designated
market interest  rate either  goes above  a  designated level  or goes  below  a
designated floor level on predetermined dates or during a specified time period.
 
     The Fund would enter into interest rate protection transactions to preserve
a  return or spread on  a particular investment or  portion of its portfolio, to
protect against any  increase in the  price of securities  the Fund  anticipates
purchasing  at a later date  or to effectively fix the  rate of interest that it
pays on one or more borrowings or series of borrowings. The Fund would use these
transactions as  a hedge  and not  as a  speculative investment.  Interest  rate
protection transactions are subject to risks comparable to those described above
with respect to other hedging strategies.
 
   
     The  Fund may enter into  interest rate swaps, caps,  collars and floors on
either an  asset-based or  liability-based  basis, depending  on whether  it  is
hedging its assets or its liabilities, and will usually enter into interest rate
swaps  on a net  basis (i.e., the two  payment streams are  netted out, with the
Fund receiving or paying,  as the case may  be, only the net  amount of the  two
payments).  Inasmuch as these interest  rate protection transactions are entered
into for good faith hedging purposes,  and inasmuch as segregated accounts  will
be established with respect to such transactions, Mitchell Hutchins and the Fund
believe  such obligations do not  constitute senior securities and, accordingly,
will not treat  them as  being subject to  its borrowing  restrictions. The  net
amount  of the excess, if  any, of the Fund's  obligations over its entitlements
with respect to each interest rate swap will be accrued on a daily basis and  an
amount  of cash or liquid securities marked to market daily, having an aggregate
net asset value at  least equal to  the accrued excess will  be maintained in  a
segregated  account  by  a  custodian that  satisfies  the  requirements  of the
Investment Company Act of  1940 ('1940 Act'). The  Fund also will establish  and
maintain  such segregated accounts  with respect to  its total obligations under
any interest
    
 
                                       14
 

<PAGE>
<PAGE>
rate swaps that  are not entered  into on a  net basis and  with respect to  any
interest rate caps, collars and floors that are written by the Fund.
 
     The  Fund will enter  into interest rate  protection transactions only with
banks and  recognized  securities dealers  determined  by Mitchell  Hutchins  to
present  minimal credit risks  in accordance with  guidelines established by the
Fund's board of directors. If  there is a default by  the other party to such  a
transaction,  the Fund will have to rely  on its contractual remedies (which may
be limited by bankruptcy, insolvency or similar laws) pursuant to the agreements
related to the transaction.
 
     The swap market has grown substantially in recent years with a large number
of banks and investment  banking firms acting both  as principals and as  agents
utilizing  standardized swap  documentation. Caps,  collars and  floors are more
recent  innovations   for  which   documentation  is   less  standardized,   and
accordingly, they are less liquid than swaps.
 
                             DIRECTORS AND OFFICERS
 
     The  overall management of the  business and affairs of  the Fund is vested
with its board  of directors. The  board of directors  approves all  significant
agreements  between the Fund and persons or companies furnishing services to it,
including the Fund's agreements with  its investment adviser and  administrator,
custodian  and  transfer  and  dividend  disbursing  agent  and  registrar.  The
day-to-day operations of the Fund are delegated to its officers and to  Mitchell
Hutchins,  subject always to  the investment objective and  policies of the Fund
and to general supervision by the board of directors.
 
     The business addresses, ages and principal occupations during the past five
years of the directors and executive officers of the Fund are:
 
   
<TABLE>
<CAPTION>
                                        POSITION                         BUSINESS EXPERIENCE;
        NAME, ADDRESS*; AGE           WITH THE FUND                       OTHER DIRECTORSHIPS
- ------------------------------------------------------  -------------------------------------------------------
 
<S>                                <C>                  <C>
Margo N. Alexander**; 50           Director and         Mrs. Alexander  is president,  chief executive  officer
                                   President              and  a director  of Mitchell  Hutchins (since January
                                                          1995) and an executive vice president and director of
                                                          PaineWebber.  Mrs.  Alexander  is  president  and   a
                                                          director  or trustee  of 29  investment companies for
                                                          which Mitchell  Hutchins  or  PaineWebber  serves  as
                                                          investment adviser.
Richard Q. Armstrong; 62           Director             Mr.   Armstrong  is  chairman   and  principal  of  RQA
  78 West Brother Drive                                   Enterprises (management consulting firm) (since April
  Greenwich, CT 06830                                     1991 and principal occupation since March 1995).  Mr.
                                                          Armstrong  is also director of Hi Lo Automotive, Inc.
                                                          He was chairman of the board, chief executive officer
                                                          and co-owner  of Adirondack  Beverages (producer  and
                                                          distributor   of  soft   drinks  and  sparkling/still
                                                          waters) (October 1993-March 1995).  He was a  partner
                                                          of  The  New  England  Consulting  Group  (management
                                                          consulting firm) (December  1992-September 1993).  He
                                                          was  managing director of LVMH U.S. Corporation (U.S.
                                                          subsidiary of the  French luxury goods  conglomerate,
                                                          Luis  Vuitton Moet Hennessey Corporation) (1987-1991)
                                                          and chairman  of  its wine  and  spirits  subsidiary,
                                                          Schieffelin   &  Somerset  Company  (1987-1991).  Mr.
                                                          Armstrong is a director  or trustee of 28  investment
                                                          companies  for which Mitchell Hutchins or PaineWebber
                                                          serves as investment advisor.
</TABLE>
    
 
                                       15
 

<PAGE>
<PAGE>
 
   
<TABLE>
<CAPTION>
                                        POSITION                         BUSINESS EXPERIENCE;
        NAME, ADDRESS*; AGE           WITH THE FUND                       OTHER DIRECTORSHIPS
- ------------------------------------------------------  -------------------------------------------------------
<S>                                <C>                  <C>
E. Garrett Bewkes, Jr.**; 70       Director and         Mr. Bewkes is  a director  of Paine  Webber Group  Inc.
                                   Chairman of the        ('PW  Group')  (holding  company  of  PaineWebber and
                                   Board of Directors     Mitchell Hutchins). Prior to December 1995, he was  a
                                                          consultant  to  PW  Group.  Prior  to  1988,  he  was
                                                          chairman of the board, president and chief  executive
                                                          officer  of the American Bakeries Company. Mr. Bewkes
                                                          is a director of Interstate Bakeries Corporation  and
                                                          NaPro  BioTherapeutics, Inc. Mr. Bewkes is a director
                                                          or trustee  of  29  investment  companies  for  which
                                                          Mitchell Hutchins or PaineWebber serves as investment
                                                          adviser.
Richard R. Burt; 50                Director             Mr.  Burt is chairman  of International Equity Partners
  1101 Connecticut                                        (international  investments   and  consulting   firm)
  Avenue, N.W.                                            (since  March  1994)  and  a  partner  of  McKinsey &
  Washington, D.C. 20036                                  Company (management consulting firm) (since 1991). He
                                                          is also a director of American Publishing Company and
                                                          Archer-Daniels-Midland Co. (agricultural
                                                          commodities). He  was  the chief  negotiator  in  the
                                                          Strategic Arms Reduction Talks with the former Soviet
                                                          Union  (1989-1991)  and  the U.S.  Ambassador  to the
                                                          Federal Republic of Germany (1985-1989). Mr. Burt  is
                                                          a  director or trustee of 28 investment companies for
                                                          which Mitchell  Hutchins  or  PaineWebber  serves  as
                                                          investment adviser.
Mary C. Farrell**; 47              Director             Ms.  Farrell is a  managing director, senior investment
                                                          strategist  and  member  of  the  Investment   Policy
                                                          Committee   of   PaineWebber.   Ms.   Farrell  joined
                                                          PaineWebber in 1982. She is a member of the Financial
                                                          Women's Association and  Women's Economic  Roundtable
                                                          and  is employed as a regular panelist on Wall $treet
                                                          Week with  Louis Rukeyser.  She  also serves  on  the
                                                          Board  of  Overseers of  New York  University's Stern
                                                          School of  Business. Ms.  Farrell  is a  director  or
                                                          trustee of 28 investment companies for which Mitchell
                                                          Hutchins or PaineWebber serves as investment adviser.
</TABLE>
    
 
                                       16
 

<PAGE>
<PAGE>
 
   
<TABLE>
<CAPTION>
                                        POSITION                         BUSINESS EXPERIENCE;
        NAME, ADDRESS*; AGE           WITH THE FUND                       OTHER DIRECTORSHIPS
- ------------------------------------------------------  -------------------------------------------------------
<S>                                <C>                  <C>
Meyer Feldberg; 55                 Director             Mr. Feldberg is Dean and Professor of Management of the
  Columbia University                                     Graduate  School  of  Business,  Columbia University.
  101 Uris Hall                                           Prior to  1989,  he  was president  of  the  Illinois
  New York, NY 10027                                      Institute  of  Technology.  Dean Feldberg  is  also a
                                                          director   of   K-III   Communications   Corporation,
                                                          Federated  Department Stores  Inc., and  Revlon, Inc.
                                                          Dean  Feldberg  is  a  director  or  trustee  of   28
                                                          investment  companies for which  Mitchell Hutchins or
                                                          PaineWebber serves as investment adviser.
George W. Gowen; 67                Director             Mr. Gowen is a partner  in the law firm of  Dunnington,
  666 Third Avenue                                        Bartholow  &  Miller. Prior  to  May 1994,  he  was a
  New York, NY 10017                                      partner in the law firm  of Fryer, Ross & Gowen.  Mr.
                                                          Gowen  is  also a  director  of Columbia  Real Estate
                                                          Investments, Inc. Mr. Gowen is a director or  trustee
                                                          of   28  investment  companies   for  which  Mitchell
                                                          Hutchins or PaineWebber serves as investment adviser.
Frederic V. Malek; 60              Director             Mr.  Malek  is  chairman  of  Thayer  Capital  Partners
  1455 Pennsylvania                                       (merchant  bank). From January 1992 to November 1992,
  Avenue, N.W.                                            he was campaign manager of Bush-Quayle '92. From 1990
  Suite 350                                               to 1992, he was vice chairman and, from 1989 to 1990,
  Washington, D.C. 20004                                  he was president of Northwest Airlines Inc., NWA Inc.
                                                          (holding company  of  Northwest  Airlines  Inc.)  and
                                                          Wings  Holdings Inc.  (holding company  of NWA Inc.).
                                                          Prior to  1989,  he  was  employed  by  the  Marriott
                                                          Corporation  (hotels,  restaurants,  airline catering
                                                          and contract feeding), where he most recently was  an
                                                          executive  vice president  and president  of Marriott
                                                          Hotels and Resorts. Mr. Malek  is also a director  of
                                                          American   Management   Systems,   Inc.   (management
                                                          consulting and computer related services),  Automatic
                                                          Data  Processing,  Inc.,  CB  Commercial  Group, Inc.
                                                          (real estate services),  Choice Hotels  International
                                                          (hotel   and  hotel  franchising),  FPL  Group,  Inc.
                                                          (electric  services),  Integra,  Inc.  (bio-medical),
                                                          Manor  Care, Inc.  (health care),  National Education
                                                          Corporation and Northwest Airlines Inc. Mr. Malek  is
                                                          a  director or trustee of 28 investment companies for
                                                          which Mitchell  Hutchins  or  PaineWebber  serves  as
                                                          investment adviser.
</TABLE>
    
 
                                       17
 

<PAGE>
<PAGE>
 
   
<TABLE>
<CAPTION>
                                        POSITION                         BUSINESS EXPERIENCE;
        NAME, ADDRESS*; AGE           WITH THE FUND                       OTHER DIRECTORSHIPS
- ------------------------------------------------------  -------------------------------------------------------
<S>                                <C>                  <C>
Carl W. Schafer; 61                Director             Mr.  Schafer  is president  of the  Atlantic Foundation
  P.O. Box 1164                                           (charitable foundation supporting mainly
  Princeton, NJ 08542                                     ocean-ographic exploration and research). He also  is
                                                          a  director of Roadway  Express, Inc. (trucking), The
                                                          Guardian Group of Mutual  Funds, Evans Systems,  Inc.
                                                          (moter   fuels,  convenience  store  and  diversified
                                                          company), Electronic Clearing House, Inc.  (financial
                                                          transactions processing), Wainoco Oil Corporation and
                                                          Nutraceutix,  Inc. (biotechnology  company). Prior to
                                                          January 1993,  he  was  chairman  of  the  Investment
                                                          Advisory  Committee  of  the  Howard  Hughes  Medical
                                                          Institute. Mr. Schafer is a director or trustee of 28
                                                          investment companies for  which Mitchell Hutchins  or
                                                          PaineWebber serves as investment adviser.
Elbridge T. Gerry III; 40          Vice President       Mr.  Gerry is a  senior vice president  and a portfolio
                                                          manager of Mitchell Hutchins. Prior to January  1996,
                                                          he  was with J.P. Morgan Private Banking where he was
                                                          responsible for managing municipal assets,  including
                                                          several  municipal bond  funds. Mr.  Gerry is  a vice
                                                          president of  five  investment  companies  for  which
                                                          Mitchell Hutchins or PaineWebber serves as investment
                                                          adviser.
Ann E. Moran; 40                   Vice President       Ms. Moran is a vice president of Mitchell Hutchins. Ms.
                                   and Assistant          Moran  is a vice president and assistant treasurer of
                                   Treasurer              29 investment companies  for which Mitchell  Hutchins
                                                          or PaineWebber serves as investment adviser.
Richard S. Murphy; 42              Vice President       Mr.  Murphy is a senior  vice president and a portfolio
                                                          manager of Mitchell Hutchins. Prior to March 1994 Mr.
                                                          Murphy was a vice president at American International
                                                          Group.  Mr.  Murphy  is  a  vice  president  of   two
                                                          investment  companies for which  Mitchell Hutchins or
                                                          PaineWebber serves as investment adviser.
Dianne E. O'Donnell; 45            Vice President       Ms. O'Donnell  is a  senior vice  president and  deputy
                                   and Secretary          general  counsel of Mitchell  Hutchins. Ms. O'Donnell
                                                          is a vice  president of 29  investment companies  and
                                                          secretary   of  28  investment  companies  for  which
                                                          Mitchell Hutchins or PaineWebber serves as investment
                                                          adviser.
</TABLE>
    
 
                                       18
 

<PAGE>
<PAGE>
 
   
<TABLE>
<CAPTION>
                                        POSITION                         BUSINESS EXPERIENCE;
        NAME, ADDRESS*; AGE           WITH THE FUND                       OTHER DIRECTORSHIPS
- ------------------------------------------------------  -------------------------------------------------------
<S>                                <C>                  <C>
Emil Polito; 36                    Vice President       Mr. Polito is a senior  vice president and director  of
                                                          operations  and control  for Mitchell  Hutchins. From
                                                          March 1991 to September 1993  he was director of  the
                                                          Mutual  Funds  Sales Support  and Service  Center for
                                                          Mitchell Hutchins and PaineWebber. Mr. Polito is vice
                                                          president  of  29  investment  companies  for   which
                                                          Mitchell Hutchins or PaineWebber serves as investment
                                                          adviser.
Victoria E. Schonfeld; 46          Vice President       Ms.  Schonfeld  is  a  managing  director  and  general
                                                          counsel of Mitchell Hutchins. Prior to May 1994,  she
                                                          was a partner in the law firm of Arnold & Porter. Ms.
                                                          Schonfeld  is  a  vice  president  of  29  investment
                                                          companies for which Mitchell Hutchins or  PaineWebber
                                                          serves as investment adviser.
Paul H. Schubert; 34               Vice President       Mr. Schubert is a first vice president and the director
                                   and Treasurer          of  the  mutual  fund  finance  division  of Mitchell
                                                          Hutchins. From August 1992 to  August 1994, he was  a
                                                          vice president of BlackRock Financial Management L.P.
                                                          Prior  to August 1992,  he was an  audit manager with
                                                          Ernst & Young LLP. Mr.  Schubert is a vice  president
                                                          and  treasurer of  29 investment  companies for which
                                                          Mitchell Hutchins or PaineWebber serves as investment
                                                          adviser.
Barney A. Taglialatela; 36         Vice President       Mr. Taglialatela is a vice  president and a manager  of
                                   and Assistant          the   mutual  fund   finance  division   of  Mitchell
                                   Treasurer              Hutchins. Prior to February 1955, he was a manager of
                                                          the mutual fund  finance division  of Kidder  Peabody
                                                          Asset  Management,  Inc. Mr.  Taglialatela is  a vice
                                                          president  of  28  investment  companies  for   which
                                                          Mitchell Hutchins or PaineWebber serves as investment
                                                          adviser.
Gregory K. Todd; 40                Vice President       Mr. Todd is a first vice president and senior associate
                                   and Assistant          general  counsel of Mitchell Hutchins. Prior to 1993,
                                   Secretary              he  was  a  partner  in  the  law  firm  of  Shereff,
                                                          Friedman,  Hoffman  &  Goodman. Mr.  Todd  is  a vice
                                                          president and assistant secretary of nine  investment
                                                          companies  and  vice president  and secretary  of one
                                                          investment company  for  which Mitchell  Hutchins  or
                                                          PaineWebber serves as investment adviser.
Keith A. Weller; 35                Vice President       Mr.  Weller  is a  first  vice president  and associate
                                   and Assistant          general counsel of  Mitchell Hutchins.  Prior to  May
                                   Secretary              1995,  he was  an attorney  in private  practice. Mr.
                                                          Weller is a vice president and assistant secretary of
                                                          28 investment companies  for which Mitchell  Hutchins
                                                          or PaineWebber serves as investment adviser.
</TABLE>
    
 
                                       19
 

<PAGE>
<PAGE>
 
   
<TABLE>
<CAPTION>
                                        POSITION                         BUSINESS EXPERIENCE;
        NAME, ADDRESS*; AGE           WITH THE FUND                       OTHER DIRECTORSHIPS
- ------------------------------------------------------  -------------------------------------------------------
<S>                                <C>                  <C>
Teresa M. West; 38                 Vice President       Ms.   West  is  a  first  vice  president  of  Mitchell
                                                          Hutchins. Prior to November 1993, she was  compliance
                                                          manager  of  Hyperion  Capital  Management,  Inc., an
                                                          investment advisory firm.  Prior to  April 1993,  Ms.
                                                          West  was  a  vice  president  and  manager  -- legal
                                                          administration of Mitchell  Hutchins. Ms.  West is  a
                                                          vice  president of 29  investment companies for which
                                                          Mitchell Hutchins or PaineWebber serves as investment
                                                          adviser.
Ian W. Williams; 39                Vice President       Mr. Williams is a vice  president and a manager of  the
                                   and Assistant          mutual  fund finance  division of  Mitchell Hutchins.
                                   Treasurer              Prior to June 1992, he was an audit senior accountant
                                                          with Price  Waterhouse LLP.  Mr. Williams  is a  vice
                                                          president   of  28  investment  companies  for  which
                                                          Mitchell Hutchins or PaineWebber serves as investment
                                                          advisor.
</TABLE>
    
 
- ------------
 
 * Unless otherwise indicated,  the business  address of each  listed person  is
   1285 Avenue of the Americas, New York, New York 10019.
 
** Mrs.  Alexander, Mr. Bewkes  and Ms. Farrell are  'interested persons' of the
   Fund, as defined in the 1940 Act  by reason of their positions with  Mitchell
   Hutchins, PaineWebber and/or PW Group.
   
                            ------------------------
     The Fund pays directors who are not 'interested persons' of the Fund $1,000
annually  and $150  for each board  meeting and  for each separate  meeting of a
board committee. Each chairman  of the audit and  contract review committees  of
the  individual funds  within the  PaineWebber fund  complex receives additional
annual compensation aggregating  $15,000 annually from  the relevant funds.  All
directors  are  reimbursed  for  any expenses  incurred  in  attending meetings.
Because Mitchell Hutchins performs substantially  all of the services  necessary
for  the operation  of the  Fund, the  Fund requires  no employees.  No officer,
director or employee of PaineWebber or Mitchell Hutchins presently receives  any
compensation  from the Fund  for acting as  a director or  officer. The 1940 Act
requires that the  holders of  the outstanding  shares of  the preferred  stock,
including the APS, voting as a separate class, have the right to select at least
two  of the  Fund's directors  at all  times. The  table below  includes certain
information relating to  the compensation  of the Fund's  current directors  who
held  office with the  Fund or other  PaineWebber funds for  the last fiscal and
calendar years.
    
 
                                       20
 

<PAGE>
<PAGE>
                               COMPENSATION TABLE
 
   
<TABLE>
<CAPTION>
                                                                                                         TOTAL
                                                                                                     COMPENSATION
                                                                                     AGGREGATE       FROM THE FUND
                                    NAME OF                                         COMPENSATION     AND THE FUND
                                PERSON, POSITION                                   FROM THE FUND*       COMPLEX
- --------------------------------------------------------------------------------   --------------    -------------
 
<S>                                                                                <C>               <C>
Richard Q. Armstrong, Director..................................................       $2,489           $59,873
Richard R. Burt, Director.......................................................        2,339            51,173
Meyer Feldberg, Director........................................................        2,448            96,181
George W. Gowen, Director.......................................................        1,323            92,431
Frederic V. Malek, Director.....................................................        1,323            92,431
Carl W. Schafer, Director.......................................................        1,323            62,307
</TABLE>
    
 
Only independent members of the board  of directors are compensated by the  Fund
and  identified above; directors who are 'interested persons,' as defined in the
1940 Act, do not receive compensation.
 
   
 * Represents fees paid to each director during the fiscal year ended March  31,
   1997.
    
 
   
 `D' Represents  total compensation  paid to each  director by the  Fund and the
     fund complex during  the twelve  months ended  December 31,  1996; no  fund
     within the complex has a bonus, pension, profit sharing or retirement plan.
    
 
              CONTROL PERSONS AND PRINCIPAL HOLDERS OF SECURITIES
 
   
     As  of July    ,  1997, Cede  & Co. (the  nominee for  The Depository Trust
Company) owned of record [              ] shares of  the Fund's Common Stock  or
    %  of the outstanding shares of the Fund's Common Stock. To the knowledge of
the Fund, no person is the beneficial owner of 5% or more of its Common Stock.
    
 
   
     As of July    , 1997, the directors and  officers of the Fund  beneficially
owned [less than 1%] of the outstanding shares of the Fund's Common Stock.
    
 
                        INVESTMENT ADVISORY ARRANGEMENTS
 
     Mitchell  Hutchins  is  the  Fund's  investment  adviser  and administrator
pursuant to a contract dated May  26, 1993 with the Fund ('Advisory  Contract').
Pursuant  to  the Advisory  Contract,  Mitchell Hutchins  provides  a continuous
investment program for the Fund and makes investment decisions and places orders
to buy, sell or hold particular securities. As administrator, Mitchell  Hutchins
supervises  all matters relating to the operation of the Fund and obtains for it
corporate, administrative and  clerical personnel, office  space, equipment  and
services, including arranging for the periodic preparation, updating, filing and
dissemination of proxy materials, tax returns and reports to the Fund's board of
directors, shareholders and regulatory authorities.
 
     In  addition  to the  payments  to  Mitchell  Hutchins  under the  Advisory
Contract  described above, the Fund pays certain other costs including:  (1) the
costs (including  brokerage  commissions) of securities purchased or sold by the
Fund and any losses incurred in connection  therewith;  (2) expenses incurred on
behalf of the Fund by  Mitchell  Hutchins;  (3)  organizational  expenses of the
Fund, whether or not advanced by Mitchell Hutchins; (4) filing fees and expenses
relating to the registration and qualification of the Common Stock under federal
and state  securities  laws; (5) fees and salaries  payable to directors who are
not  interested  persons  of the Fund or  Mitchell  Hutchins;  (6) all  expenses
incurred in connection with the directors' services,  including travel expenses;
(7) taxes (including any income or franchise  taxes) and governmental  fees; (8)
costs of any liability,  uncollectible  items of deposit and any other insurance
or fidelity bonds; (9) any costs,  expenses or losses arising out of a liability
of or claims for damages or other relief asserted against the Fund for violation
of any law; (10) legal,  accounting and auditing expenses,  including legal fees
of special  counsel for the independent  directors;  (11) charges of custodians,
transfer agents and other agents;  (12) costs of preparing  share  certificates;
(13) expenses of printing and  distributing  reports to  stockholders;  (14) any
extraordinary expenses (including fees and disbursements of counsel) incurred by
the Fund;  (15) fees,  voluntary  assessments  and other  expenses  incurred  in
connection with membership in investment  company  organizations;  (16) costs of
mailing and

                                       21
 

<PAGE>
<PAGE>
tabulating  proxies  and costs of meetings  of  stockholders,  the board and any
committees  thereof;  (17) the costs of investment  company literature and other
publications  provided  to  directors  and  officers;  (18)  costs  of  mailing,
stationery and  communications  equipment;  (19) interest charges on borrowings;
(20) fees and  expenses  of listing  and  maintaining  any listing of the Fund's
shares on the New York  Stock  Exchange,  Inc.  ('NYSE')  or any other  national
securities exchange;  and (21) costs and expenses (including rating agency fees)
associated with the issuance of any preferred stock.
 
     The Advisory Contract was approved by the Fund's board of directors and  by
a  majority of the directors who neither  are interested persons of the Fund nor
have any  direct  or  indirect  financial  interest  in  the  Advisory  Contract
('Independent  Directors'), on February 23, 1993  and by its initial stockholder
on May 26, 1993. Unless sooner terminated, the Advisory Contract will remain  in
effect  for two  years from  its execution.  Thereafter, if  not terminated, the
Advisory Contract  will continue  automatically for  successive annual  periods,
provided  that such continuance is specifically  approved at least annually: (1)
by a majority  vote of the  Independent Directors  cast in person  at a  meeting
called  for the  purpose of  voting on such  approval; and  (2) by  the board of
directors or by vote of a  majority of the outstanding voting securities  (i.e.,
the  Common  Stockholders and  any preferred  stockholders,  voting as  a single
class) of the Fund.
 
     Under the Advisory Contract, Mitchell Hutchins  will not be liable for  any
error  of judgment or  mistake of law  or for any  loss suffered by  the Fund in
connection with  the Advisory  Contract, except  a loss  resulting from  willful
misfeasance,  bad faith or gross negligence on  the part of Mitchell Hutchins in
the performance  of its  duties or  from reckless  disregard of  its duties  and
obligations  under the Advisory Contract. The Advisory Contract is terminable by
vote of  the  board  of directors  or  by  the  holders of  a  majority  of  the
outstanding  voting securities of the  Fund, at any time  without penalty, on 60
days' written notice  to Mitchell Hutchins.  The Advisory Contract  may also  be
terminated  by Mitchell  Hutchins on  60 days' written  notice to  the Fund. The
Advisory Contract terminates automatically upon its assignment.
 
   
     For the fiscal years  ended March 31,  1997, March 31,  1996 and March  31,
1995,  the  Fund  paid or  accrued  to  Mitchell Hutchins  $3,988,417  (of which
$1,107,893 was waived by Mitchell  Hutchins), $3,988,174 (of which $927,265  was
waived  by  Mitchell  Hutchins)  and  $3,195,714,  respectively,  in  investment
advisory and administration fees.
    
 
   
     Mitchell Hutchins personnel may invest in securities for their own accounts
pursuant to  a  code  of  ethics  that describes  the  fiduciary  duty  owed  to
shareholders  of  the  PaineWebber  mutual  funds  and  other  Mitchell Hutchins
advisory accounts  held  by  all  Mitchell  Hutchins'  directors,  officers  and
employees, that establishes procedures for personal investing and that restricts
certain   transactions.  For  example,  employee   accounts  generally  must  be
maintained  at  PaineWebber,   personal  trades  in   most  securities   require
pre-clearance  and  short-term  trading  and  participation  in  initial  public
offerings generally  are  prohibited.  In  addition, the  code  of  ethics  puts
restrictions  on  the timing  of  personal investing  in  relation to  trades by
PaineWebber funds and other Mitchell Hutchins advisory clients.
    
 
                             PORTFOLIO TRANSACTIONS
 
   
     Subject to  policies  established  by  the  board  of  directors,  Mitchell
Hutchins  is responsible for the execution  of the Fund's portfolio transactions
and  the   allocation  of   brokerage  transactions.   In  executing   portfolio
transactions,  Mitchell Hutchins  seeks to obtain  the best net  results for the
Fund, taking into account  such factors as the  price (including the  applicable
dealer  spread or brokerage commission), size  of order, difficulty of execution
and operational facilities of the firm involved. Municipal Obligations in  which
the Fund invests generally are traded on the OTC market on a 'net' basis without
a  stated commission  through dealers  acting for their  own account  and not as
brokers. Prices paid to  dealers in principal  transactions generally include  a
'spread,'  which is  the difference  between the prices  at which  the dealer is
willing to purchase and sell  a specific security at  that time. For the  fiscal
years  ended March 31, 1997, March 31, 1996 and March 31, 1995, the Fund paid no
brokerage commissions.
    
 
     In placing orders with dealers,  Mitchell  Hutchins  attempts to obtain the
best net price and the most favorable execution of its orders. Mitchell Hutchins
may purchase and sell portfolio  securities  from and to dealers who provide the
Fund with research, analysis, statistical or pricing advice or similar services.
 
                                       22
 

<PAGE>
<PAGE>
   
Portfolio transactions will not be directed by the Fund to dealers solely on the
basis of research  and advice  provided.  The Fund will not  purchase  portfolio
securities  at a  higher  price  or sell  such  securities  at a lower  price in
connection with transactions  effected with a dealer,  acting as principal,  who
furnishes  research  services to Mitchell  Hutchins than would be the case if no
weight  were given by  Mitchell  Hutchins  to the  dealer's  furnishing  of such
services.  Moreover,  Mitchell  Hutchins  will not enter into any explicit  soft
dollar arrangements  relating to principal  transactions and will not receive in
principal  transactions  the types of services which could be purchased for hard
dollars.  Mitchell Hutchins may engage in agency  transactions in OTC equity and
debt   securities  in  return  for  research  and  execution   services.   These
transactions  are entered into only in compliance with procedures  ensuring that
the  transaction  (including  commissions)  is at least as favorable as it would
have been if effected directly with a market-maker that did not provide research
for execution  services.  These procedures  include Mitchell Hutchins  receiving
multiple  quotes from dealers  before  executing  the  transaction  on an agency
basis.  Research  services  furnished by the dealers through which or with which
the Fund effects  securities  transactions  may be used by Mitchell  Hutchins in
advising other funds or accounts they advise and, conversely,  research services
furnished to Mitchell  Hutchins in connection  with other funds or accounts that
Mitchell  Hutchins advises may be used in advising the Fund.  Although it is not
possible  to  place a  dollar  value on those  services,  it is the  opinion  of
Mitchell  Hutchins  that the  receipt  of such  services  should  not reduce its
overall research  expenses.  Information and research  received from brokers and
dealers  is in  addition  to, and not in lieu of, the  services  required  to be
performed by Mitchell Hutchins under the Advisory Contract. For the fiscal years
ended March 31, 1997, March 31, 1996 and March 31, 1995,  Mitchell  Hutchins did
not direct any portfolio  transactions  to brokers  chosen  because they provide
research and analysis.
    
 
   
     The Fund has no obligation to deal  with any broker or group of brokers  in
the  execution of portfolio transactions. The Fund contemplates that, consistent
with obtaining the  best net  results, brokerage transactions  may be  conducted
through  Mitchell Hutchins or  any of its  affilates, including PaineWebber. The
Fund's board of directors has adopted  procedures in conformity with Rule  17e-1
under  the 1940 Act  to ensure that  all brokerage commissions  paid to Mitchell
Hutchins or any of its affiliates  are reasonable and fair. Specific  provisions
in  the Mitchell  Hutchins Contract authorize  Mitchell Hutchins and  any of its
affiliates which  is  a member  of  a  national securities  exchange  to  effect
portfolio  transactions for the Fund on such exchange and to retain compensation
in connection with such transactions. Any such transactions will be effected and
related compensation paid only in accordance with applicable SEC regulations.
    
 
     Investment decisions for the Fund and for other investment accounts managed
by Mitchell  Hutchins will  be made  independently  of each  other in  light  of
differing  considerations for the various accounts. However, the same investment
decision may occasionally be made for the Fund and one or more such accounts. In
such cases, simultaneous  transactions are inevitable.  Purchases or sales  then
will  be averaged  as to  price and  allocated between  the Fund  and such other
account(s) as to amount according to a formula deemed equitable to the Fund  and
such  account(s). While  in some  cases this  practice could  have a detrimental
effect upon the price or value of the security as far as the Fund is  concerned,
or  upon its ability to complete its entire order, in other cases it is believed
that coordination and the ability to participate in volume transactions will  be
beneficial to the Fund.
 
   
     Transactions  in futures contracts are  executed through futures commission
merchants ('FCMs') who  receive brokerage  commissions for  their services.  The
Fund's  procedures  in selecting  FCM's to  execute  the Fund's  transactions in
futures contracts  are similar  to those  in effect  with respect  to  brokerage
transactions in securities. For the fiscal years ended March 31, 1997, March 31,
1996 and March 31, 1995, the Fund paid no commissions to FCMs.
    
 
     The Fund will not purchase  securities that are offered in underwritings in
which  PaineWebber,  Mitchell Hutchins or any of their affiliates is a member of
the underwriting or selling group,  except pursuant to procedures adopted by the
board of  directors  pursuant  to Rule  10f-3  under the 1940 Act.  Among  other
things,  these  procedures  require  that  the  commission  or  spread  paid  in
connection  with such a purchase be reasonable and fair, that the purchase be at
not more than the public  offering  price prior to the end of the first business
day  after  the  date of the  public  offering  and that  PaineWebber,  Mitchell
Hutchins and their affiliates not participate in or benefit from the sale to the
Fund.

 
                                       23
 

<PAGE>
<PAGE>
 
PORTFOLIO TURNOVER
 
   
     For the fiscal years ended  March 31, 1997 and  March 31, 1996, the  Fund's
portfolio turnover rate was 0% and 4%, respectively. Portfolio turnover may vary
from year to year and will not be a limiting factor when Mitchell Hutchins deems
portfolio  changes  appropriate. The  portfolio turnover  rate is  calculated by
dividing the  lesser  of the  Fund's  annual  sales or  purchases  of  portfolio
securities  (exclusive of purchases  or sales of  securities whose maturities at
the time of acquisition were one year  or less) by the monthly average value  of
the long-term securities in the portfolio during the year.
    
 
                           VALUATION OF COMMON STOCK
 
     The  net asset value of the Common  Stock is determined weekly, as directed
by the Fund's board of directors, and also is determined monthly as of the close
of regular trading on the NYSE on the last day of the month on which the NYSE is
open for trading. The net asset value  per share of Common Stock is computed  by
dividing  the value of  the securities held by  the Fund plus  any cash or other
assets (including interest and dividends accrued but not yet received and earned
discount) minus all liabilities (including accrued expenses) and the liquidation
preference of any outstanding preferred stock  by the total number of shares  of
Common Stock outstanding at such time.
 
     When  market quotations are  readily available, the  Fund's debt securities
are valued based upon those quotations.  When market quotations for options  and
futures  positions held by  the Fund are readily  available, those positions are
valued based upon such quotations. Market quotations generally are not available
for options traded  in the OTC  market. When market  quotations for options  and
futures positions or any other securities and assets of the Fund are not readily
available, they are valued at fair value as determined in good faith by or under
the  direction  of  the  board of  directors,  generally  based  upon appraisals
received from a pricing  service using a computerized  matrix system or  derived
from  information concerning  the security  or similar  securities received from
recognized  dealers  in  those  securities.  Notwithstanding  the  above,   debt
securities  with maturities of 60 days or less generally are valued at amortized
cost if their original term  to maturity was 60 days  or less, or by  amortizing
the difference between their fair value as of the 61st day prior to maturity and
their maturity value if their original term to maturity exceeded 60 days, unless
in  either case the board of directors or its delegate determines that this does
not represent fair value.
 
                                       24




<PAGE>
<PAGE>
                                     TAXES
 
TAXATION OF THE FUND
 
     General.  In  order to  continue to  qualify for  treatment as  a regulated
investment company  ('RIC')  under the  Internal  Revenue Code,  the  Fund  must
distribute  to its stockholders for each taxable year at least 90% of the sum of
its net interest income excludable from gross income under section 103(a) of the
Internal Revenue Code ('tax-exempt income') plus its investment company  taxable
income  (consisting generally of  taxable net investment  income, net short-term
capital  gain  and  net  realized  gains  from  certain  hedging   transactions)
('Distribution  Requirement')  and  must meet  several  additional requirements.
Among these requirements are  the following: (1) the  Fund must derive at  least
90%  of its  gross income each  taxable year from  dividends, interest, payments
with respect to securities loans and gains from the sale or other disposition of
securities, or other income (including gains from options or futures  contracts)
derived  with  respect  to  its business  of  investing  in  securities ('Income
Requirement'); (2) the Fund must derive less  than 30% of its gross income  each
taxable  year  from the  sale  or other  disposition  of securities,  options or
futures contracts held  for less than  three months ('Short-Short  Limitation');
(3) at the close of each quarter of the Fund's taxable year, at least 50% of the
value  of its  total assets  must be  represented by  cash and  cash items, U.S.
government securities, securities of other RICs and other securities, with those
other securities limited, in respect of any  one issuer, to an amount that  does
not  exceed 5% of the value of the Fund's  total assets; and (4) at the close of
each quarter of the Fund's taxable year, not  more than 25% of the value of  its
total  assets  may  be  invested  in  securities  (other  than  U.S.  government
securities or the  securities of  other RICs)  of any  one issuer.  If the  Fund
failed to qualify for treatment as a RIC for any taxable year, it would be taxed
as  an ordinary corporation  on its taxable  income for that  year (even if that
income was distributed  to its stockholders)  and all distributions  out of  its
earnings  and profits (including those  attributable to tax-exempt income) would
be taxable to its stockholders as dividends (that is, ordinary income).
 
     The Fund will be subject to a nondeductible 4% excise tax ('Excise Tax') to
the extent it fails to distribute by the  end of any calendar year at least  98%
of  the sum of  its ordinary income  (not including tax-exempt  income) for that
year and its capital gain net income  for the one-year period ending on  October
31  of  that year,  plus certain  other  amounts. For  these purposes,  any such
taxable income retained by the  Fund, and on which  it pays federal income  tax,
will be treated as having been distributed.
 
     While  any  shares of  preferred stock  are outstanding,  the Fund  may not
declare any cash dividend or other  distribution on the Common Stock unless,  at
the  time of  the declaration, the  Fund satisfies certain  dividend payment and
asset coverage  requirements.  See  'Special  Leverage  Considerations'  in  the
Prospectus.  Any  such suspension  of distributions  on  the Common  Stock could
prevent the  Fund  from satisfying  the  Distribution Requirement  and  avoiding
imposition  of the Excise Tax. For so long as the Fund has outstanding preferred
stock, it will be required  to allocate each particular  type of its income  for
each  taxable year (such  as tax-exempt income, net  realized capital gains, and
other taxable  income) between  the  two classes  of  shares, Common  Stock  and
preferred  stock, in  proportion to  the total  distributions paid  to each such
class for  that  year.  It is  not  expected  that any  portion  of  the  Fund's
distributions  will be  eligible for the  dividends-received deduction available
for corporations.
 
     Pursuant to a published ruling  of the Internal Revenue Service,  insurance
proceeds  received by the  Fund from an  insurer with whom  the Fund maintains a
policy described in the Prospectus will be treated as tax-exempt interest income
to the same extent as  if such payments were made  by the issuer of the  insured
Municipal  Obligations  and will  be eligible  for distribution  as part  of the
Fund's exempt-interest dividends. In the case of a failure by a municipality  to
appropriate  funds sufficient to  satisfy a Municipal  Obligation, it is unclear
whether  payments  made   by  an   insurer  in   place  of   interest  on   such
non-appropriated  obligation will  be excludable  from gross  income for federal
income tax purposes.
 
   
     The Fund may acquire zero coupon Municipal Obligations issued with original
issue discount. As the holder of such a security, the Fund would have to include
in its tax-exempt income  for purposes of the  Distribution Requirement, and  in
its  gross income  for purposes  of the  Income Requirement  and the Short-Short
Limitation the original  issue discount  that accrues  on the  security for  the
taxable  year, even if the  Fund receives no payment  on the security during the
year. Because the Fund annually must
    
 
                                       25
 

<PAGE>
<PAGE>
distribute at least 90% of its tax-exempt income and investment company  taxable
income,   including  any  accrued  original   issue  discount,  to  satisfy  the
Distribution Requirement, it may be required in a particular year to  distribute
as  a  dividend an  amount that  is greater  than  the total  amount of  cash it
actually receives. Those distributions will be made from the Fund's cash  assets
or  from the proceeds  of sales of  portfolio securities or  from borrowings, if
necessary. The  Fund may  realize taxable  capital gains  or losses  from  those
sales, which would increase or decrease its investment company taxable income or
net  capital gain (the excess of net  long-term capital gain over net short-term
capital loss). Because of the Short-Short Limitation, any such gains realized on
the disposition of securities held for  less than three months would reduce  the
Fund's  ability to sell other  securities, or options or  futures, held for less
than three months  that it  might wish  to sell in  the ordinary  course of  its
portfolio management.
 
     Hedging  Strategies.  The  use  of  hedging  strategies,  such  as  writing
(selling) and purchasing options and  futures, involves complex rules that  will
determine for income tax purposes the character and timing of recognition of the
gains and losses the Fund realizes in connection therewith. These rules also may
require  the Fund  to 'mark to  market' (that is,  treat as sold  for their fair
market value)  at  the  end  of  each taxable  year  certain  positions  in  its
portfolio,  which may cause the Fund  to recognize income without receiving cash
with  which  to  make  distributions  necessary  to  satisfy  the   Distribution
Requirement  and to avoid imposition of the  Excise Tax. In that event, the Fund
might  have  to  liquidate  securities  to  enable  it  to  make  the   required
distributions,  which  would cause  it to  recognize gains  or losses  and might
affect its ability to satisfy the Short-Short Limitation.
 
     Gains from options  and futures  derived by the  Fund with  respect to  its
business of investing in securities will qualify as permissible income under the
Income  Requirement. However, income from the disposition of options and futures
will be subject to  the Short-Short Limitation  if they are  held for less  than
three months.
 
     If  the Fund  satisfies certain  requirements, any  increase in  value of a
position that is part of a 'designated hedge' will be offset by any decrease  in
value  (whether realized or  not) of the offsetting  hedging position during the
period of the hedge for purposes  of determining whether the Fund satisfies  the
Short-Short  Limitation. Thus,  only the net  gain (if any)  from the designated
hedge will be included in gross income for purposes of that limitation. The Fund
will consider  whether it  should seek  to qualify  for this  treatment for  its
hedging  transactions.  To  the  extent  the  Fund  does  not  qualify  for this
treatment, it may  be forced to  defer the  closing out of  certain options  and
futures  beyond the time  when it otherwise  would be advantageous  to do so, in
order for the Fund to continue to qualify as a RIC.
 
TAXATION OF STOCKHOLDERS
 
     Entities or other persons who  are 'substantial users' (or persons  related
to  'substantial users') of  facilities financed by IDBs  or PABs should consult
their tax advisers before purchasing shares  of Common Stock because, for  users
of  certain of these facilities,  the interest on such  bonds is not exempt from
federal income tax. For these purposes,  the term 'substantial user' is  defined
generally  to  include a  'non-exempt  person' who  regularly  uses in  trade or
business a part of a facility financed from the proceeds of IDBs or PABs.
 
     Up to  85% of  social  security and  railroad  retirement benefits  may  be
included  in taxable income for recipients  whose modified adjusted gross income
(including income from tax-exempt  sources such as the  Fund) plus 50% of  their
net  benefits exceeds certain base  amounts. Exempt-interest dividends are still
tax-exempt to the extent described in the Prospectus; they are only included  in
the calculation of whether a recipient's income exceeds the established amounts.
 
     Distributions  of the Fund's net  capital gain, if any,  will be taxable to
its stockholders as long-term  capital gains, regardless of  the length of  time
they held their Fund shares.
 
     A  participant in the Fund's Dividend  Reinvestment Plan will be treated as
having received a distribution in the amount of the cash used to purchase shares
of Common Stock on  his behalf, including  a pro rata  portion of the  brokerage
fees  incurred by  the Transfer Agent.  See 'Dividends  and Other Distributions;
Dividend Reinvestment Plan' in the Prospectus.
 
     The Fund is required to withhold 31% of all taxable dividends, capital gain
distributions and repurchase  proceeds payable  to any  individuals and  certain
other noncorporate stockholders who do not
 
                                       26
 

<PAGE>
<PAGE>
   
provide  the Fund with a correct  taxpayer identification number. Withholding at
that rate also is required from taxable dividends and capital gain distributions
payable to stockholders who otherwise are subject to backup withholding.
    
 
                             ADDITIONAL INFORMATION
 
SHARE REPURCHASES AND TENDERS
 
     As discussed in the  Prospectus, the Fund's board  of directors may  tender
for  its shares to reduce or eliminate the  discount to net asset value at which
the Fund's shares might trade. Even if a tender offer has been made, it will  be
the  board's announced policy, which may be  changed by the board, not to accept
tenders or effect repurchases (or, if a  tender offer has not been made, not  to
initiate  a tender offer)  if: (1) such transactions,  if consummated, would (a)
result in the  delisting of  the Common  Stock from  the NYSE  (the NYSE  having
advised  the Fund that it would consider delisting if the aggregate market value
of the outstanding shares is less  than $5,000,000, the number of publicly  held
shares  falls  below 600,000  or  the number  of  round-lot holders  falls below
1,200), (b) impair the Fund's  status as a RIC  under the Internal Revenue  Code
(which  would eliminate the  Fund's eligibility to deduct  dividends paid to its
stockholders, thus causing the Fund's income to be fully taxed at the  corporate
level  in addition to the taxation  of stockholders upon dividends received from
the Fund) or (c) cause the Fund to violate applicable asset coverage or  similar
requirements  on outstanding preferred  stock or borrowings;  (2) the Fund would
not be  able  to  liquidate  portfolio  securities  in  an  orderly  manner  and
consistent  with  the  Fund's  investment objective  and  policies  in  order to
repurchase its  shares;  or (3)  there  is, in  the  board's judgment,  any  (a)
material  legal action or  proceeding instituted or  threatened challenging such
transactions  or  otherwise  materially   adversely  affecting  the  Fund,   (b)
suspension  of trading  or limitation on  prices of securities  generally on the
NYSE or any other exchange on which portfolio securities of the Fund are traded,
(c) declaration of a banking moratorium  by federal or state authorities or  any
suspension of payment by banks in the United States, New York State or any state
in  which the Fund invests, (d) limitation  affecting the Fund or the issuers of
its portfolio  securities  imposed  by  federal  or  state  authorities  on  the
extension  of credit  by lending  institutions, (e)  commencement of  war, armed
hostilities or other international or  national calamity directly or  indirectly
involving  the United States or  (f) other event or  condition that would have a
material adverse  effect  on  the  Fund  or  its  stockholders  if  shares  were
repurchased.  The board  of directors  may modify  these conditions  in light of
experience.
 
COUNSEL
 
     The law  firm of  Kirkpatrick &  Lockhart LLP,  1800 Massachusetts  Avenue,
N.W.,  Washington, D.C.  20036-1800, counsel  to the  Fund, has  passed upon the
legality of the  Common Stock offered  by the Fund's  Prospectus. Kirkpatrick  &
Lockhart  LLP  also acts  as  counsel to  Mitchell  Hutchins and  PaineWebber in
connection with other matters.
 
INDEPENDENT AUDITORS
 
     Ernst & Young LLP, 787 Seventh Avenue, New York, New York 10019, serves  as
the independent auditors for the Fund.
 
                             FINANCIAL INFORMATION
 
   
     The  Fund's Annual Report  to Stockholders for the  fiscal year ended March
31, 1997  is a  separate document  supplied with  this Statement  of  Additional
Information  and  the financial  statements,  accompanying notes  and  report of
independent auditors appearing  therein are  incorporated by  reference in  this
Statement of Additional Information.
    
 
                                       27
 

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<PAGE>
<PAGE>
                                                                      APPENDIX A
 
RATINGS OF INSURANCE COMPANY CLAIMS-PAYING ABILITY
 
     The  claims-paying ability of  insurance companies is  rated by Moody's and
S&P. Descriptions of these ratings are set forth below:
 
DESCRIPTION OF MOODY'S RATINGS OF INSURANCE COMPANY CLAIMS-PAYING ABILITY
 
     Aaa. Insurance companies  rated Aaa offer  exceptional financial  security.
While  the  financial strength  of  these companies  is  likely to  change, such
changes as can  be visualized are  most unlikely to  impair their  fundamentally
strong position.
 
     Aa.  Insurance  companies  rated  Aa  offer  excellent  financial security.
Together with the  Aaa group they  constitute what are  generally known as  high
grade companies. They are rated lower than Aaa companies because long-term risks
appear somewhat larger.
 
     A.  Insurance  companies rated  A offer  good financial  security. However,
elements may be present which suggest a susceptibility to impairment sometime in
the future.
 
     Baa. Insurance  companies  rated  Baa offer  adequate  financial  security.
However, certain protective elements may be lacking or may be characteristically
unreliable over any great length of time.
 
Note: Numeric modifiers are used to refer to the ranking within the group -- one
being the highest and three being the lowest. However, the financial strength of
companies within a generic rating symbol (Aa, for example) is broadly the same.
 
DESCRIPTION OF S&P'S RATINGS OF INSURANCE COMPANY CLAIMS-PAYING ABILITY
 
     AAA.  Superior  financial  security  on  an  absolute  and  relative basis.
Capacity to meet  policyholder obligations  is overwhelming under  a variety  of
economic and underwriting conditions.
 
     AA. Excellent financial security. Capacity to meet policyholder obligations
is strong under a variety of economic and underwriting conditions.
 
     A.  Good financial security, but  capacity to meet policyholder obligations
is somewhat susceptible to adverse economic and underwriting conditions.
 
     BBB.  Adequate  financial  security,  but  capacity  to  meet  policyholder
obligations is susceptible to adverse economic and underwriting conditions.
 
Note:  Plus  (+) and  minus  ( -  ) signs  indicate  relative standing  within a
category, and are not indications of likely upgrades or downgrades.
 
RATINGS OF MUNICIPAL BONDS AND COMMERCIAL PAPER
 
     Municipal bonds  are  rated by  Moody's  and S&P.  Moody's  also  publishes
separate  ratings for municipal  notes. Descriptions of  these ratings, together
with the ratings assigned by Moody's and S&P to commercial paper, are set  forth
below.
 
DESCRIPTION OF MOODY'S MUNICIPAL BOND RATINGS
 
   
     Aaa.  Bonds which are  rated Aaa are judged  to be of  the best quality and
carry the smallest degree  of investment risk and  are generally referred to  as
'gilt  edge.' Interest payments are protected by  a large or by an exceptionally
stable margin and principal is secure. While the various protective elements are
likely to change, such changes as can be visualized are most unlikely to  impair
the fundamentally strong position of such issues.
    
 
   
     Aa.  Bonds which  are rated  Aa are  judged to  be of  high quality  by all
standards. Together with the Aaa group they comprise what are generally known as
high grade bonds. They are  rated lower than the  best bonds because margins  of
protection  may  not  be  as  large as  in  Aaa  securities,  or  fluctuation of
    
 
                                      A-1
 

<PAGE>
<PAGE>
protective elements may be of greater  amplitude or there may be other  elements
present  which  make the  long-term  risks appear  somewhat  larger than  in Aaa
securities.
 
     A. Bonds which are rated A possess many favorable investment attributes and
are considered to be upper medium grade obligations. Factors giving security  to
principal  and interest  are considered  adequate, but  elements may  be present
which suggest a susceptibility to impairment sometime in the future.
 
     Baa. Bonds which are rated Baa are considered as medium grade  obligations,
i.e.,  they are neither  highly protected nor  poorly secured. Interest payments
and principal security appear  adequate for the  present but certain  protective
elements  may be lacking or may  be characteristically unreliable over any great
length of time. Such  bonds lack outstanding  investment characteristics and  in
fact have speculative characteristics as well.
 
Note: Those bonds in the Aa, A and Baa groups which Moody's believes possess the
strongest investment attributes are designated by the symbols Aa1, A1 and Baa1.
 
DESCRIPTION OF S&P'S MUNICIPAL BOND RATINGS
 
     AAA. Debt rated AAA has the highest rating assigned by S&P. Capacity to pay
interest and repay principal is extremely strong.
 
     AA.  Debt rated  AA has a  very strong  capacity to pay  interest and repay
principal and differs from the highest rated issues only in small degree.
 
     A. Debt rated A has a strong  capacity to pay interest and repay  principal
although  it is somewhat more  susceptible to the adverse  effects of changes in
circumstances and economic conditions than debt in higher rated categories.
 
     BBB. Debt rated BBB is regarded as having adequate capacity to pay interest
and  repay  principal.   Whereas  it  normally   exhibits  adequate   protection
parameters,  adverse  economic  conditions or  changing  circumstances  are more
likely to lead to a  weakened capacity to pay  interest and repay principal  for
debt in this category than in higher rated categories.
 
NOTE: Plus (+) or Minus ( - ): The ratings from 'AA' to 'BBB' may be modified by
the  addition of a plus or minus sign to show relative standing within the major
categories.
 
DESCRIPTION OF MOODY'S HIGHEST RATINGS OF STATE AND MUNICIPAL NOTES AND
OTHER SHORT-TERM LOANS
 
     Moody's ratings for state  and municipal notes  and other short-term  loans
are  designated 'Moody's Investment  Grade' ('MIG' or,  for variable or floating
rate obligations,  'VMIG').  Such  ratings  recognize  the  differences  between
short-term  credit risk and  long-term risk. Factors  affecting the liquidity of
the borrower  and  short-term  cyclical  elements  are  critical  in  short-term
ratings. Symbols used will be as follows:
 
   
          MIG-1/VMIG-1.  This designation denotes best quality. There is present
     strong protection by established cash flows, superior liquidity support  or
     demonstrated broad based access to the market for refinancing.
    
 
          MIG-2/VMIG-2.  This  designation  denotes  high  quality.  Margins  of
     protection are ample although not so large as in the preceding group.
 
DESCRIPTION OF S&P'S RATINGS OF STATE AND MUNICIPAL NOTES AND
OTHER SHORT-TERM LOANS
 
     S&P's tax exempt note ratings are generally given to such notes that mature
in three years or less. The two higher rating categories are as follows:
 
          SP-1. Very strong or  strong capacity to  pay principal and  interest.
     Those issues determined to possess overwhelming safety characteristics will
     be given a plus (+) designation.
 
          SP-2. Satisfactory capacity to pay principal and interest.
 
                                      A-2
 

<PAGE>
<PAGE>
DESCRIPTION OF COMMERCIAL PAPER RATINGS
 
   
     Issuers  assigned Prime-1 by Moody's have a superior capacity for repayment
of senior  short-term promissory  obligations. Prime-1  repayment capacity  will
normally be evidenced by the following characteristics: leading market positions
in  well-established  industries;  high  rates  of  return  on  funds  employed;
conservative capitalization structures with moderate reliance on debt and  ample
asset  protection; broad margins in earning  coverage of fixed financial charges
and high  internal  cash generation;  well  established  access to  a  range  of
financial  markets and assured sources  of alternate liquidity. Issuers assigned
Prime-2  have  a   strong  ability  for   repayment  of  short-term   promissory
obligations.  This will  normally be  evidenced by  many of  the characteristics
cited above but to a lesser  degree. Earnings trends and coverage ratios,  while
sound,  may be more subject  to variation. Capitalization characteristics, while
still appropriate, may be more affected by external conditions. Ample  alternate
liquidity is maintained.
    
 
     Issues  assigned A  by S&P,  the highest  rating category,  are regarded as
having the greatest capacity for timely  repayment. Issues in this category  are
delineated  with  the numbers  1, 2  and 3  to indicate  the relative  degree of
safety. The A-1 designation indicates that the degree of safety regarding timely
payment is strong. Those  issues determined to  possess extremely strong  safety
characteristics   are  denoted  with  a  plus  sign  (+)  designation.  The  A-2
designation indicates  that the  capacity for  timely payment  is  satisfactory.
However,  the relative degree of safety is  not as high as for issues designated
A-1.
 
                                      A-3
 

<PAGE>
<PAGE>
                      [This page intentionally left blank]




<PAGE>
<PAGE>
                                                                      APPENDIX B
 
                            RATING AGENCY GUIDELINES
 
     S&P AAA RATING GUIDELINES. For purposes of calculating the Discounted Value
of  the Fund's portfolio under current S&P  guidelines, the fair market value of
Municipal Obligations  eligible for  consideration under  such guidelines  ('S&P
Eligible  Assets') must be  discounted by certain discount  factors set forth in
the table below ('S&P  Discount Factors'). The Discounted  Value of a  Municipal
Obligation  under S&P guidelines is the fair market value thereof divided by the
S&P Discount Factors.  The S&P  Discount Factor  used to  discount a  particular
Municipal Obligation will be determined by reference to (i)(A) in the event such
Municipal  Obligation is not covered  by insurance or is  covered by an Original
Issuance Insurance policy or a Portfolio Insurance policy which does not provide
the Fund with the  option to obtain permanent  insurance equivalent to  Original
Issue or Secondary Market Insurance ('Permanent Insurance') with respect to such
Municipal  Obligation, or which is not escrow  backed, the S&P or Moody's rating
on such Municipal  Obligation, (B)  in the  event such  Municipal Obligation  is
covered  by a Secondary Market Insurance policy, the S&P insurance claims-paying
ability rating of the issuer  of the policy or (C)  in the event such  Municipal
Obligation  is guaranteed  or is covered  by a Portfolio  Insurance policy which
provides the Fund with the option to obtain Permanent Insurance with respect  to
such  Municipal Obligation, at  the Fund's option  the S&P or  Moody's rating on
such Municipal Obligation or the  S&P insurance claims-paying ability rating  of
the  guarantor or issuer  of the Portfolio  Insurance policy, and  (ii) the 'S&P
Exposure Period' (currently, 3 Business Days). S&P Discount Factors for a  range
of exposure periods are set forth below:
 
<TABLE>
<CAPTION>
                                                                  S&P DISCOUNT FACTORS
                                                                     RATING CATEGORY
                                                               ---------------------------
S&P EXPOSURE PERIOD                                            AAA     AA       A      BBB
- ------------------------------------------------------------   ---     ---     ---     ---
 
<S>                                                            <C>     <C>     <C>     <C>
40 Business Days............................................   190%    195%    210%    250%
22 Business Days............................................   170     175     190     230
10 Business Days............................................   155     160     175     215
 7 Business Days............................................   150     155     170     210
 3 Business Days............................................   130     135     150     190
</TABLE>
 
     Since  the S&P  Exposure Period currently  applicable to the  Fund is three
Business Days, the  S&P Discount  Factors currently applicable  to S&P  Eligible
Assets  will be determined  by reference to  the factors set  forth opposite the
line entitled  '3 Business  Days.' Notwithstanding  the foregoing,  (i) the  S&P
Discount  Factor for short-term  Municipal Obligations will be  115%, so long as
such Municipal Obligations are rated A-1+ or  SP-1+ by S&P and mature or have  a
demand  feature exercisable within  30 days or  less, or 125%  if such Municipal
Obligations are not  rated by  S&P but  are rated  VMIG-1, MIG-1  or Prime-1  by
Moody's;  provided, however,  that any  such Moody's-rated  short-term Municipal
Obligations which have demand features exercisable  within 30 days or less  must
be  backed by a letter of credit, liquidity facility or guarantee from a bank or
other financial institution with a short-term rating of at least A-1+ from  S&P;
and  further provided  that such Moody's-rated  short-term Municipal Obligations
may comprise no more than 50%  of short-term Municipal Obligations that  qualify
as  S&P Eligible Assets and (ii) no S&P  Discount Factor will be applied to cash
or to Receivables for Municipal Obligations Sold. For purposes of the foregoing,
Anticipation Notes rated SP-1+ or, if not rated by S&P, rated MIG-1 or VMIG-1 by
Moody's, which do not mature or have  a demand feature at par exercisable in  30
days  and  which  do not  have  a long-term  rating,  will be  considered  to be
short-term Municipal Obligations. 'Receivables for Municipal Obligations  Sold,'
for  purposes of calculating S&P Eligible Assets as of any Valuation Date, means
the book value of receivables for Municipal  Obligations sold as of or prior  to
such  Valuation Date if  such receivables are  due within five  business days of
such Valuation Date.
 
     The S&P guidelines impose certain minimum issue size, issuer,  geographical
diversification  and other requirements for purposes of determining S&P Eligible
Assets:
 
          (1)  In  order  to  be  considered  S&P  Eligible  Assets,   Municipal
     Obligations owned by the Fund must:
 
             (a) Be interest bearing and pay interest at least semi-annually;
 
                                      B-1
 

<PAGE>
<PAGE>
             (b)  Be  payable with  respect to  principal  and interest  in U.S.
        dollars;
 
             (c) Be publicly rated BBB or higher by S&P or, if not rated by  S&P
        but rated by Moody's, be rated at least A by Moody's; provided that such
        Moody's-rated  Municipal Obligations  will be  included in  S&P Eligible
        Assets only  to the  extent  the fair  market  value of  such  Municipal
        Obligations  does not exceed  50% of the aggregate  fair market value of
        S&P Eligible  Assets.  For  purposes of  determining  the  S&P  Discount
        Factors applicable to such Moody's-rated Municipal Obligations, any such
        Municipal  Obligation will be deemed to have  an S&P rating which is one
        full rating category lower than its Moody's rating;
 
             (d) Not be private placements; and
 
             (e) Be part of an issue with an original issue size of at least $20
        million or, if of an issue with an original issue size below $20 million
        (but in no event lower than $10 million), be issued by an issuer with  a
        total of at least $50 million of securities outstanding.
 
          (2)  Municipal Obligations of  any one issuer  or guarantor (excluding
     bond insurers) will be  considered S&P Eligible Assets  only to the  extent
     the  fair market value of such Municipal Obligations does not exceed 10% of
     the aggregate fair market value of S&P Eligible Assets, provided that 2% is
     added to the applicable S&P Discount Factor for every 1% by which the  fair
     market value of such Municipal Obligations exceeds 5% of the aggregate fair
     market value of S&P Eligible Assets.
 
          (3)   Municipal  Obligations  issued  by  issuers  in  any  one  state
     (including the District of Columbia), territory or possession of the United
     States will be considered S&P Eligible  Assets only to the extent the  fair
     market  value  of such  Municipal Obligations  does not  exceed 20%  of the
     aggregate fair market value of S&P Eligible Assets.
 
     For purposes of determining as of  any Valuation Date whether the Fund  has
S&P Eligible Assets with an aggregate Discounted Value at least equal to the APS
Basic  Maintenance  Amount,  the  Fund  will  include  as  a  liability  in  the
calculation  of  the   APS  Basic  Maintenance   Amount  an  amount   calculated
semi-annually  equal  to  150%  of the  estimated  cost  of  obtaining Permanent
Insurance with respect to S&P Eligible Assets that (i) are covered by  Portfolio
Insurance  policies  which  provide the  Fund  with  the option  to  obtain such
Permanent Insurance and (ii) are discounted by an S&P Discount Factor determined
by reference  to the  insurance  claims-paying ability  of  the issuer  of  such
Portfolio Insurance policy.
 
     For  so long  as shares  of any series  of APS  are Outstanding  and S&P is
rating such  APS,  the Fund  will  not, unless  the  Fund has  received  written
confirmation  from S&P  that any  such action would  not impair  the rating then
assigned by  S&P  to the  APS,  engage  in any  one  or more  of  the  following
transactions: engage in reverse repurchase agreement transactions; borrow money,
except  that the Fund may, without  obtaining the written confirmation described
above, borrow money for the purposes of clearing securities transactions if  the
APS  Basic Maintenance Amount would continue to be satisfied after giving effect
to such borrowing; issue any class or series of shares ranking prior to or on  a
parity with the APS with respect to the payment of dividends or the distribution
of  assets upon dissolution, liquidation  or winding up of  the Fund, or reissue
any APS previously purchased or redeemed by the Fund; lend portfolio securities;
merge or  consolidate  with  any corporation;  engage  in  repurchase  agreement
transactions  in which the term of such  repurchase obligation is longer than 90
days, in which the  underlying security is a  security other than United  States
Treasury  securities (not inclusive of zero-coupon securities), demand deposits,
certificates of deposit, or  bankers acceptances in  which the counter-party  or
its affiliates have securities rated A-1+ by S&P with respect to such underlying
security;  or engage in short sale transactions.  In addition, as long as shares
of APS are so rated or unless such confirmation has been received, the Fund will
not enter into interest rate caps,  collars or floors, purchase or sell  futures
contracts or options thereon or write uncovered put or uncovered call options on
portfolio  securities except  that (i)  the Fund may  engage in  any S&P Hedging
Transactions based on  the Municipal  Index, provided  that the  Fund shall  not
engage  in any S&P Hedging Transaction based  on the Municipal Index (other than
Closing Transactions) which would cause the Fund at the time of such transaction
to own  or have  sold  the least  of (1)  more  than 1,000  outstanding  futures
contracts  based on the Municipal Index, (2) outstanding futures contracts based
on the Municipal Index and on the Treasury Bonds exceeding in number 25% of  the
quotient of the fair market value of the Fund's
 
                                      B-2
 

<PAGE>
<PAGE>
total  assets divided by  100,000 or (3) outstanding  futures contracts based on
the Municipal  Index exceeding  in number  10% of  the average  number of  daily
traded futures contracts based on the Municipal Index, in the month prior to the
time  of effecting such transaction  as reported by The  Wall Street Journal and
(ii) the Fund may  engage in S&P Hedging  Transactions based on Treasury  Bonds,
provided  that the Fund shall not engage in any S&P Hedging Transaction based on
Treasury Bonds (other than Closing Transactions)  which would cause the Fund  at
the  time of such transaction to own or  have sold the lesser of (1) outstanding
futures contracts based on Treasury Bonds  and on the Municipal Index  exceeding
in  number 25%  of the  quotient of the  fair market  value of  the Fund's total
assets divided by 100,000 or (2) outstanding futures contracts based on Treasury
Bonds exceeding in  number 10%  of the average  number of  daily traded  futures
contracts  based  on the  Treasury  Bonds, in  the month  prior  to the  time of
effecting such transaction as reported by The Wall Street Journal.
 
     For so long as shares of any series of APS are rated by S&P, the Fund  will
engage  in Closing  Transactions to close  out any  outstanding futures contract
which the Fund owns or has sold  or any outstanding option thereon owned by  the
Fund  in  the event  (i) the  Fund does  not  have S&P  Eligible Assets  with an
aggregate Discounted Value equal  to or greater than  the APS Basic  Maintenance
Amount  on two consecutive Valuation Dates and  (ii) the Fund is required to pay
Variation Margin on the second such Valuation Date. For so long as shares of any
series of APS are rated by S&P, the Fund will engage in a Closing Transaction to
close out any outstanding futures contract or option thereon in the month  prior
to the delivery month under the terms of such futures contract or option thereon
unless  the Fund holds securities deliverable  under such terms. For purposes of
determining S&P  Eligible Assets  to  determine compliance  with the  APS  Basic
Maintenance  Amount, no amounts  on deposit with the  Fund's custodian or broker
representing Initial Margin  or Variation Margin  shall constitute S&P  Eligible
Assets.  For so long as shares  of any series of APS  are rated by S&P, when the
Fund writes a futures contract or option thereon, it will maintain an amount  of
cash,  cash equivalents or  short-term, money market  securities in a segregated
account with the  Fund's custodian, so  that the amount  so segregated plus  the
amount  of Initial Margin and Variation Margin held in the account of the Fund's
broker equals the fair market value of the futures contract, except that in  the
event  the  Fund writes  a  futures contract  or  option thereon  which requires
delivery of  an  underlying  security,  the  Fund  shall  hold  such  underlying
security.
 
     Moody's 'aaa' Rating Guidelines. For purposes of calculating the Discounted
Value  of the Fund's portfolio under current Moody's guidelines, the fair market
value of Municipal Obligations eligible for consideration under such  guidelines
('Moody's  Eligible Assets') must be discounted  by certain discount factors set
forth in the table below ('Moody's Discount Factors'). The Discounted Value of a
Municipal Obligation under Moody's guidelines  is the fair market value  thereof
divided  by the  Moody's Discount  Factor. The  Moody's Discount  Factor used to
discount a particular Municipal  Obligation will be  determined by reference  to
(i)(A)  in the event such Municipal Obligation is not covered by insurance or is
covered by an Original  Issue Insurance policy or  a Portfolio Insurance  policy
which  does not provide the  Fund with the option  to obtain Permanent Insurance
with respect to such  Municipal Obligation, or which  is not escrow backed,  the
Moody's  or  S&P rating  on such  Municipal  Obligation, (B)  in the  event such
Municipal Obligation is  covered by  a Secondary Insurance  policy, the  Moody's
insurance  financial strength rating of  the issuer of the  policy or (C) in the
event such  Municipal Obligation  is guaranteed  or is  covered by  a  Portfolio
Insurance  Policy which  provides the Fund  with the option  to obtain Permanent
Insurance with respect to  such Municipal Obligation, at  the Fund's option  the
Moody's  or S&P  rating on  such Municipal  Obligation or  the Moody's insurance
financial strength rating of the guarantor or issuer of the Portfolio  Insurance
policy,  and (ii)  the 'Moody's  Exposure Period'  currently, the  47-day period
commencing on a given Valuation Date).  Moody's Discount Factors for a range  of
exposure periods are set forth below:
 
<TABLE>
<CAPTION>
                                                                   MOODY'S DISCOUNT FACTORS RATING CATEGORY
                                                    -----------------------------------------------------------------------
                                                                                                       VMIG-1        SP-1+
MOODY'S EXPOSURE PERIOD                             Aaa(1)    Aa(1)    A(1)    Baa(1)    OTHER(2)    (1) (3) (4)    (3) (4)
- -------------------------------------------------   ------    -----    ----    ------    --------    -----------    -------
 
<S>                                                 <C>       <C>      <C>      <C>       <C>         <C>            <C>
7 weeks or less..................................     151%     159%    168%      202%       229%         136%         148%
8 weeks or less but greater than 7 weeks.........     154      164     173       205        235          137          149
9 weeks or less but greater than 8 weeks.........     158      169     179       209        242          138          150
</TABLE>
 
                                                        (footnotes on next page)
 
                                      B-3
 

<PAGE>
<PAGE>
(footnotes from previous page)
 
(1) Moody's rating.
 
(2) Municipal  Obligations not rated by Moody's but rated BBB - , BBB or BBB+ by
    S&P.
 
(3) Municipal Obligations rated  MIG-1, VMIG-1 or  Prime-1 or, if  not rated  by
    Moody's,  rated SP-1+ by S&P which do not mature or have a demand feature at
    par exercisable within the Moody's Exposure  Period and which do not have  a
    long-term rating.
 
(4) For  the  purposes  of  the definition  of  Moody's  Eligible  Assets, these
    securities will have an assumed rating of 'A' by Moody's.
 
                            ------------------------
 
     The Fund will  not obtain  any Portfolio Insurance  policies without  prior
written  confirmation  from  Moody's that  the  use  of such  policies  will not
adversely affect the Moody's rating of the APS.
 
     Since the Moody's Exposure  Period currently applicable to  the Fund is  47
days,  the  Moody's Discount  Factors currently  applicable to  Moody's Eligible
Assets will be  determined by reference  to the factors  set forth opposite  the
line entitled '7 weeks or less.' However, if the Moody's Discount Factor used to
discount  a particular  Municipal Obligation is  determined by  reference to the
insurance financial strength rating of the insurer of such Municipal Obligation,
such Moody's Discount Factor will be increased by an amount equal to 50% of  the
difference  between (i) the  percentage set forth  in the above  table under the
applicable rating category, and (ii) the percentage set forth in the above table
under the  rating category  that is  one rating  category below  the  applicable
rating category.
 
     Notwithstanding  the  foregoing, (i)  no  Moody's Discount  Factor  will be
applied  to  short-term  Municipal  Obligations   so  long  as  such   Municipal
Obligations are rated at least MIG-1, VMIG-1 or Prime-1 by Moody's and mature or
have a demand feature at par exercisable within the Moody's Exposure Period, and
the  Moody's Discount Factor for such Municipal Obligations will be 125% as long
as such Municipal Obligations are rated A1  - /AA or SP-1+/AA by S&P and  mature
or  have a demand feature at par  exercisable within the Moody's Exposure Period
and (ii)  no  Moody's  Discount  Factor  will be  applied  to  cash  or  to  the
Receivables   for  Municipal   Obligations  Sold.   'Receivables  for  Municipal
Obligations Sold,' for purposes of calculating Moody's Eligible Assets as of any
Valuation Date, means no more that the aggregate of the following: (i) the  book
value  of receivables  for Municipal  Obligations sold  as of  or prior  to such
Valuation Date if  such receivables are  due within five  business days of  such
Valuation  Date,  and if  the trades  which generated  such receivables  are (x)
settled through clearinghouse firms with respect to which the Fund has  received
prior  written authorization  from Moody's or  (y) with  counterparties having a
Moody's long-term debt rating of at least Baa3; and (ii) the Moody's  Discounted
Value  of Municipal Obligations sold as of or prior to such Valuation Date which
generated receivables, if such receivables  are due within the Moody's  Exposure
Period but do not comply with either of conditions (x) or (y).
 
     The   Moody's  guidelines  impose  certain   minimum  issue  size,  issuer,
geographical diversification and other requirements for purposes of  determining
Moody's Eligible Assets, as set forth in the table below:
 
<TABLE>
<CAPTION>
                                                MINIMUM ISSUE     MAXIMUM      MAXIMUM STATE OR
                                                    SIZE         UNDERLYING       TERRITORY
RATING                                           (MILLIONS)      OBLIGOR**     CONCENTRATION**
- ---------------------------------------------   -------------    ----------    ----------------
 
<S>                                             <C>              <C>           <C>
Aaa..........................................        $10             100%             100%
Aa...........................................         10              20               60
A............................................         10              10               40
Baa..........................................         10               6               20
Other*.......................................         10               4               12
</TABLE>
 
- ------------
 
 * Municipal Obligations not rated by Moody's but rated at least BBB - by S&P.
 
** The  referenced  percentages  represent  maximum  cumulative  totals  for the
   related rating category and each lower rating category.
 
                                      B-4
 

<PAGE>
<PAGE>
     Current  Moody's  guidelines  also   require  that  Municipal   Obligations
constituting Moody's Eligible Assets pay interest in cash, be publicly rated Baa
or  higher by Moody's or, if not rated by Moody's but rated by S&P, that they be
rated at  least BBB  by  S&P, and  that they  not  have suspended  ratings.  For
purposes  of  determining  the  Moody's  Discount  Factors  applicable  to  such
S&P-rated Municipal  Obligations,  any  such  Municipal  Obligations  (excluding
short-term  Municipal Obligations) will be deemed to have a Moody's rating which
is one  full  rating  category  lower  than its  S&P  rating.  For  purposes  of
calculation  of Minimum Issue Size, Maximum Underlying Obligor and Maximum State
or Territory Concentration, Moody's Eligible Assets shall be calculated  without
including  cash and Municipal Obligations rated  MIG-1, VMIG-1 or Prime-1 or, if
not rated by Moody's, rated SP-1+ by  S&P, which either mature or have a  demand
feature  at par exercisable  within the Moody's Exposure  Period. Where the Fund
sells an asset and agrees to repurchase such asset in the future, the Discounted
Value of such asset will constitute a Moody's Eligible Asset and the amount  the
Fund  is required to pay upon repurchase of such asset will count as a liability
for the purposes of the APS  Basic Maintenance Amount. Where the Fund  purchases
an  asset and agrees to sell it to  a third party in the future, cash receivable
by the Fund thereby  will constitute a Moody's  Eligible Asset if the  long-term
debt  of such other party is rated at least A2 by Moody's and such agreement has
a term of 30  days or less;  otherwise the Discounted Value  of such asset  will
constitute a Moody's Eligible Asset.
 
     For  purposes of determining as of any  Valuation Date whether the Fund has
Moody's Eligible Assets with an aggregate Discounted Value at least equal to the
APS Basic  Maintenance Amount,  the Fund  shall include  as a  liability in  the
calculation   of  the  APS   Basic  Maintenance  Amount   an  amount  calculated
semi-annually equal  to  150%  of  the estimated  cost  of  obtaining  Permanent
Insurance  with  respect to  Moody's  Eligible Assets  that  (i) are  covered by
Portfolio Insurance policies which  provide the Fund with  the option to  obtain
such  Permanent Insurance and  (ii) are discounted by  a Moody's Discount Factor
determined by reference  to the  insurance claims-paying ability  rating of  the
issuer of such Portfolio Insurance policy.
 
     Notwithstanding  the foregoing, an  asset will not  be considered a Moody's
Eligible Asset to  the extent  that it has  been irrevocably  deposited for  the
payment of (A)(i) through (A)(vii) under the definition of APS Basic Maintenance
Amount  or  it  is subject  to  any  material lien,  mortgage,  pledge, security
interest or security agreement of  any kind (collectively, 'Liens'), except  for
(a) Liens which are being contested in good faith by appropriate proceedings and
which Moody's has indicated to the Fund will not affect the status of such asset
as  a Moody's  Eligible Asset,  (b) Liens for  taxes that  are not  then due and
payable or that  can be  paid thereafter without  penalty, (c)  Liens to  secure
payment for services rendered or cash advanced to the Fund by Mitchell Hutchins,
State Street Bank and Trust Company or the Auction Agent and (d) Liens by virtue
of any repurchase agreement.
 
     For  so long as the shares of any series of APS are Outstanding and the APS
are rated  by  Moody's,  the Fund  will  not,  unless it  has  received  written
confirmation from Moody's that any such action would not impair the ratings then
assigned  by Moody's  to the  APS, engage in  any one  or more  of the following
transactions: (1)  incur any  indebtedness, except  that the  Fund may,  without
obtaining the prior written approval described above, incur indebtedness for the
purpose  of clearing securities transactions if  the Discounted Value of Moody's
Eligible Assets would  equal or exceed  the APS Basic  Maintenance Amount  after
giving  effect to  such indebtedness;  (2) issue any  class or  series of shares
ranking prior to  or on a  parity with the  APS with respect  to the payment  of
dividends or the distribution of assets upon dissolution, liquidation or winding
up of the Fund, or reissue any APS previously purchased or redeemed by the Fund;
(3)  engage in  short sale  transactions; or (4)  except as  necessary to effect
Closing Transactions, engage in transactions  in options on securities,  futures
contracts  or  options  on futures  contracts,  except that  in  connection with
Moody's Hedging  Transactions: (A)  the Fund  may  buy call  or put  options  on
securities;  (B) the Fund may write covered  call options on securities; (C) the
Fund may write put options on securities; (D) the Fund may enter into  positions
in  futures contracts based on the Municipal  Index provided that the Fund shall
not engage in any  such transaction which  would cause the Fund  at the time  of
such  transaction to own or have sold (1) outstanding futures contracts based on
the Municipal Index  exceeding in number  10% of the  rolling average number  of
daily  traded futures contracts based on the  Municipal Index in the 30 calendar
days prior to the  time of effecting  such transaction as  reported by The  Wall
Street   Journal   or   (2)   outstanding  futures   contracts   based   on  the
 
                                      B-5
 

<PAGE>
<PAGE>
Muncipal Index and options  on such futures contracts  having an aggregate  fair
market  value (taking  into account the  fair market value  of futures contracts
based on Treasury  Bonds) exceeding the  fair market value  of Moody's  Eligible
Assets  owned by  the Fund;  (E) the  Fund may  enter into  futures contracts on
Treasury Bonds provided that the Fund  shall not engage in any such  transaction
which  would cause the Fund at the time  of such transaction to own or have sold
(1) outstanding futures contracts  based on Treasury Bonds  and options on  such
futures contracts having an aggregate fair market value (taking into account the
fair  market value of futures contracts  based on the Municipal Index) exceeding
40% of the aggregate fair market value  of Moody's Eligible Assets owned by  the
Fund  and rated Aa  by Moody's (or,  if not rated  by Moody's but  rated by S&P,
rated AAA by S&P) or (2)  outstanding futures contracts based on Treasury  Bonds
and  options on  such futures  contracts having  an aggregate  fair market value
(taking into account  the fair market  value of futures  contracts based on  the
Municipal  Index) exceeding  80% of the  aggregate fair market  value of Moody's
Eligible Assets owned  by the Fund  and rated Baa  or A by  Moody's (or, if  not
rated  by Moody's but rated by  S&P, rated A or AA  by S&P); for purposes of the
foregoing clauses (D) and  (E), the Fund  shall be deemed to  own the number  of
futures  contracts that underlie any outstanding option written by the Fund; and
(F) the Fund may buy call or  put options on futures contracts on the  Municipal
Index  or  Treasury  Bonds, may  write  put  options on  such  futures contracts
(provided, that  if the  contract would  require delivery  of a  security,  that
security must be held by the Fund) and may write call options on such futures if
it owns the futures contract subject to the option.
 
     For  so long as shares of any series  of APS are rated by Moody's, the Fund
will engage  in  Closing  Transactions  to close  out  any  outstanding  futures
contract  based on the Municipal Index if the open interest with respect to such
futures contracts based on  the Municipal Index as  reported by The Wall  Street
Journal  is less than 5,000. For so long  as shares of APS are rated by Moody's,
the Fund  will engage  in a  Closing Transaction  to close  out any  outstanding
futures  contract by no later than the fifth  Business Day of the month in which
such contract expires and will engage in a Closing Transaction to close out  any
outstanding option on a futures contract by no later than the first Business Day
of  the month in  which such option  expires. For so  long as shares  of APS are
rated by Moody's, the Fund will  engage in transactions with respect to  futures
contracts  or  options  thereon having  only  the  next settlement  date  or the
settlement date immediately thereafter.
 
     For purposes of valuation of Moody's Eligible Assets (i) if the Fund writes
a call option, the underlying asset will be valued as follows: (A) if the option
is exchanged-traded and may  be offset readily or  if the option expires  before
the  earliest possible  redemption of  the APS, at  the lower  of the Discounted
Value of the underlying  security of the  option and the  exercise price of  the
option  or (B) otherwise, it has no value; (ii) if the Fund writes a put option,
the underlying asset will be valued as follows: the lesser of (A) exercise price
and (B) the Discounted Value of the underlying security; (iii) if the Fund is  a
seller  under a futures contract, the underlying  security will be valued at the
lower of  (A)  settlement price  and  (B)  Discounted Value  of  the  underlying
security;  provided  that, if  a contract  matures  within the  Moody's Exposure
Period, the security may be valued at the settlement price; (iv) if the Fund  is
the  buyer under a futures  contract, the underlying security  will be valued at
the lower  of (A)  the settlement  price and  (B) the  Discounted Value  of  the
underlying  security; provided that, if the  contract matures within the Moody's
Exposure Period,  the  security  may  be  valued  at  Discounted  Value  of  the
underlying  security; and (v) call  or put option contracts  which the Fund buys
have no value. For so long as shares of any series of APS are rated by  Moody's:
(1)  the Fund will not engage in options and futures transactions for leveraging
or speculative  purposes; (2)  the Fund  will not  write any  anticipatory  call
options or sell any anticipatory contracts pursuant to which the Fund hedges the
anticipated  purchase of an asset prior to  completion of such purchase; (3) the
Fund will not enter into an  option or futures transaction unless, after  giving
effect  thereto, the Fund would continue to have Moody's Eligible Assets with an
aggregate Discounted Value equal  to or greater than  the APS Basic  Maintenance
Amount;  (4) for  purposes of  the APS  Basic Maintenance  Amount (i)  assets in
margin accounts are  not Moody's  Eligible Assets,  (ii) 10%  of the  settlement
price  of assets sold under  a futures contract, the  settlement price of assets
purchased under a  futures contract and  the settlement price  of an  underlying
futures  contract  if the  Fund  writes put  options  on futures  contracts will
constitute liabilities of the Fund and (iii) if the Fund writes call options  on
futures  contracts and does not own the underlying futures contract, 105% of the
fair market value of the underlying futures contract will constitute a liability
of
 
                                      B-6
 

<PAGE>
<PAGE>
the Fund; (5) the Fund shall  enter into only exchange-traded futures and  shall
write  only exchange-traded options on exchanges  approved by Moody's; (6) where
delivery may be made  to the Fund with  any of a class  of securities, the  Fund
shall  assume for  purposes of  the APS Basic  Maintenance Amount  that it takes
delivery of that security which yields it the least value; (7) the Fund will not
engage in forward contracts; (8) the  Fund will enter into futures contracts  as
seller  only  if it  owns  the underlying  security; and  (9)  there shall  be a
quarterly audit  made of  the Fund's  futures and  options transactions  by  the
Fund's  independent accountants to  confirm that the Fund  is in compliance with
these standards.
 
                                      B-7
 

<PAGE>
<PAGE>
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<PAGE>
<PAGE>
                      [This page intentionally left blank]


<PAGE>
<PAGE>
_____________________________                      _____________________________
 
     NO  PERSON  HAS BEEN  AUTHORIZED TO  GIVE  ANY INFORMATION  OR TO  MAKE ANY
REPRESENTATIONS NOT  CONTAINED  IN  THE  PROSPECTUS  OR  IN  THIS  STATEMENT  OF
ADDITIONAL  INFORMATION IN CONNECTION  WITH THE OFFERING  MADE BY THE PROSPECTUS
AND, IF GIVEN OR  MADE, SUCH INFORMATION OR  REPRESENTATIONS MUST NOT BE  RELIED
UPON  AS HAVING BEEN AUTHORIZED  BY THE FUND OR  PAINEWEBBER. THE PROSPECTUS AND
THIS STATEMENT OF ADDITIONAL  INFORMATION DO NOT CONSTITUTE  AN OFFERING BY  THE
FUND  OR  BY PAINEWEBBER  IN ANY  JURISDICTION  IN WHICH  SUCH OFFERING  MAY NOT
LAWFULLY BE MADE.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                                                                                               PAGE
                                                                                                                               ----
 
<S>                                                                                                                            <C>
Investment Policies and Restrictions........................................................................................      1
 
Hedging and Related Income Strategies.......................................................................................      9
 
Directors and Officers......................................................................................................     15
 
Control Persons and Principal Holders of Securities.........................................................................     21
 
Investment Advisory Arrangements............................................................................................     21
 
Portfolio Transactions......................................................................................................     22
 
Valuation of Common Stock...................................................................................................     24
 
Taxes.......................................................................................................................     25
 
Additional Information......................................................................................................     27
 
Financial Information.......................................................................................................     27
 
Appendix A..................................................................................................................    A-1
 
Appendix B..................................................................................................................    B-1
</TABLE>
    
 
                               INSURED MUNICIPAL
                                INCOME FUND INC.
                                  COMMON STOCK
 
                            ------------------------
                            STATEMENT OF ADDITIONAL
                                  INFORMATION
                            ------------------------
 
                            PaineWebber Incorporated
 
                            ------------------------
 
   
                                 August 1, 1997
    
 
   
'c' 1997 PaineWebber Incorporated
    



<PAGE>
<PAGE>



   

                           PART C -- OTHER INFORMATION

ITEM 24.  FINANCIAL STATEMENTS AND EXHIBITS

     1. Financial Statements:

        Included in Part A of the Registration Statement:

        a. Financial  Highlights  for each of the three fiscal years ended March
           31, 1997 and for the period June 8, 1993 (commencement of operations)
           to March 31, 1994

        Included in Part B of the Registration  Statement through  incorporation
        by  reference  from the Annual  Report to the  Stockholders,  previously
        filed  with  the Securities and Exchange Commission through EDGAR on May
        27, 1997 (File No. 33-58532) (Accession No. 0000897802-97-000001):

        a. Portfolio of Investments as of March 31, 1997

        b. Statement of Assets and Liabilities as of March 31, 1997

        c. Statement of Operations for the fiscal year ended March 31, 1997

        d. Statement of Cash Flows for the fiscal year ended March 31, 1997

        e. Statement  of  Changes in Net Assets for each of the two years in the
           period ended March 31, 1997

        f. Notes to Financial Statements

        g. Financial Highlights

        h. Report of Ernst & Young LLP, Independent Auditors, dated May 27, 1997

     2. Exhibits:

        a. (i)   Articles of  Incorporation (1)

           (ii)  Articles Supplementary dated August 5, 1993 (1)

           (iii) Articles Supplementary dated November 28, 1994 (1)

           (iv)  Articles of Amendment dated April 12, 1996 (2)

        b. Bylaws (3)

        c. None

        d. Inapplicable


- --------
(1) Incorporated by reference to exhibit a. to Post-Effective Amendment No. 2 to
    the Registration  Statement  on Form N-2  filed  June  15,  1995  (File  No.
    33-58532).

(2) Incorporated by reference to exhibit a. to Post-Effective Amendment No. 3 to
    the  Registration  Statement  on Form  N-2  filed  May  31,  1996  (File No.
    33-58532).

(3) Incorporated by reference to exhibit 2 to the Registration Statement on Form
    N-2 filed February 19, 1993 (File No. 33-58532).
    

                                      II-1


<PAGE>
<PAGE>

   


        e. Dividend Reinvestment Plan (4)

        f. None

        g. Investment Advisory and Administration Contract (5)

        h. None (6)

        i. None

        j. (i)   Custodian Agreement (7)

           (ii)  Letter  Agreement  between  the Fund and the  Depository  Trust
                 Company dated 8/12/93 (8)

           (iii) Letter  Agreement  between  the Fund and the  Depository  Trust
                 Company dated 11/28/94 (8)

        k. (i)   Transfer Agency Agreement (9)

           (ii)  Broker-Dealer  Agreement  between  Bankers  Trust  Company  and
                 Goldman, Sachs & Co. dated 8/12/93 (10)

           (iii) Broker-Dealer  Agreement  between  Bankers  Trust  Company  and
                 PaineWebber Incorporated dated 8/12/93 (10)

           (iv)  Auction  Agency  Agreement  between the Fund and Bankers  Trust
                 Company dated 8/12/93 (10)

           (v)   Broker-Dealer  Agreement  between  Bankers  Trust  Company  and
                 Goldman, Sachs & Co. dated 11/28/94 (10)

           (vi)  Broker-Dealer  Agreement  between  Bankers  Trust  Company  and
                 PaineWebber Incorporated dated 11/28/94 (10)
           (vii) Auction  Agency  Agreement  between the Fund and Bankers  Trust
                 Company dated 11/28/94 (10)

- --------
 (4) Incorporated  by  reference to exhibit 5 to  Pre-Effective  Amendment No. 2
     to the Registration Statement on Form N-2  filed  May  27,  1993  (File No.
     33-58532).

 (5) Incorporated by  reference to exhibit g. to Post-Effective  Amendment No. 1
     to the Registration Statement on Form N-2 filed  July  25,  1994  (File No.
     33-58532).

 (6) The shares offered  by the  prospectus  will be  offered in order to effect
     over-the-counter  secondary  market  transactions  by  PaineWebber  in  its
     capacity  as  a  dealer  and secondary market maker and not pursuant to any
     agreement with the Fund.  Shares of the common stock were originally issued
     pursuant to an Underwriting Agreement incorporated by reference  to exhibit
     h.(i)  to  Post-Effective  Amendment  No. 1 to the  Registration  Statement
     on  Form  N-2  filed  July  25,  1994  (File  No. 33-58532), and  a related
     document,  incorporated by  reference  to  exhibit  8(b)  to  Pre-Effective
     Amendment  No.  2 to the Registration Statement  on  Form N-2 filed May 27,
     1993 (File No. 33-58532).

 (7) Incorporated by  reference to exhibit j. to Post-Effective  Amendment No. 1
     to the Registration Statement on Form N-2 filed July  25,  1994  (File  No.
     33-58532).

 (8) Incorporated  by reference to exhibit j. to Post-Effective  Amendment No. 2
     to the Registration Statement on Form N-2  filed  June 15, 1995  (File  No.
     33-58532).

 (9) Incorporated by reference to exhibit k. to  Post-Effective  Amendment No. 1
     to the Registration Statement on Form N-2  filed  July  25, 1994  (File No.
     33-58532).

(10) Incorporated by reference to exhibit k.  to  Post-Effective Amendment No. 2
     to the Registration Statement on Form N-2 filed  June 15,  1995  (File  No.
     33-58532).
    

                                      II-2



<PAGE>
<PAGE>

   


        l. Opinion and Consent of Counsel (11)

        m. None

        n. Consent of Independent Auditors (filed herewith)

        o. None

        p. Letter of Investment Intent (12)

        q. None

        r. Financial Data Schedule (filed herewith)

    

ITEM 25.  MARKETING ARRANGEMENTS

     Inapplicable.

ITEM 26.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

     Not applicable to current Post-Effective  Amendment;  for expenses incurred
in connection with this Registration Statement,  see Pre-Effective Amendment No.
2 to the Fund's Registration Statement on Form N-2, SEC File No. 33-58532, filed
May 27, 1993.

ITEM 27.  PERSONS CONTROLLED BY OR UNDER COMMON CONTROL

     None.

   
ITEM 28.  NUMBER OF HOLDERS OF SECURITIES

                                                               Number of Record
                                                              Stockholders as of
TITLE OF CLASS                                                     5/23/97
- --------------                                                     --------
Shares of Common Stock, par value
$0.001 per share........................................              864
Auction Preferred Shares, Series A......................               5
Auction Preferred Shares, Series B......................               4
Auction Preferred Shares, Series C......................               3
Auction Preferred Shares, Series D......................               5

    

ITEM 29.  INDEMNIFICATION

     Incorporated by reference to Item 29 of Part C to  Pre-Effective  Amendment
No. 2 to the  Registration  Statement  on Form N-2 filed May 27,  1993 (File No.
33-58532).

ITEM 30.  BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER

     See "Management of the Fund" in the Prospectus.

     Mitchell  Hutchins,  a Delaware  corporation,  is a  registered  investment
adviser and is wholly  owned by  PaineWebber,  which in turn is wholly  owned by
Paine Webber Group Inc. Mitchell Hutchins is primarily engaged in the investment
advisory

- --------

(11) Incorporated by  reference to exhibit 12 to  Pre-Effective  Amendment No. 2
     to the Registration Statement on Form N-2  filed  May  27,  1993  (File No.
     33-58532).

(12) Incorporated by  reference to exhibit 16 to  Pre-Effective  Amendment No. 2
     to the Registration Statement on Form N-2  filed  May  27,  1933  (File No.
     33-58532).

                                      II-3



<PAGE>
<PAGE>



business.  Information  as to  executive  officers  and  directors  of  Mitchell
Hutchins is included in its Form ADV as filed with the SEC (Registration  number
801-13219) and incorporated by reference.

ITEM 31.  LOCATION OF ACCOUNTS AND RECORDS

     The  accounts  and  records of the Fund are  maintained  at the  offices of
Mitchell  Hutchins at 1285 Avenue of the Americas,  New York, New York 10019 and
at the office of the Fund's  custodian  State Street Bank and Trust Company,  at
One Heritage Drive, North Quincy,  Massachusetts  02171 and at the office of the
Trust's  transfer  agent,  PNC Bank,  National  Association,  c/o PFPC Inc., 103
Bellevue Parkway, Wilmington, Delaware 19809.

ITEM 32.  MANAGEMENT SERVICES

     None.

ITEM 33.  UNDERTAKINGS

     The Registrant hereby undertakes:

          (1) To file,  during  any  period  in which  offers or sales are being
     made, a post-effective amendment to this registration statement:

              (i)   To include any  prospectus  required by Section  10(a)(3) of
                    the Securities Act of 1933;

              (ii)  To reflect  in the  prospectus  any facts or events  arising
                    after the effective date of the  registration  statement (or
                    the most recent  post-effective  amendment  thereof)  which,
                    individually  or in the  aggregate,  represent a fundamental
                    change  in the  information  set  forth in the  registration
                    statement; and

              (iii) To include any material information with respect to the plan
                    of distribution not previously disclosed in the registration
                    statement or any material change to such  information in the
                    registration statement.

          (2) That for the  purpose  of  determining  any  liability  under  the
     Securities Act of 1933, the information omitted from the form of prospectus
     filed as part of this registration statement in reliance upon Rule 430A and
     contained in a form of prospectus filed by the registrant  pursuant to Rule
     424(b)(1) or (4) or 497 under the Securities Act shall be deemed to be part
     of this registration statement as of the time it was declared effective.

          (3) That for the  purpose  of  determining  any  liability  under  the
     Securities Act of 1933, each post-effective amendment shall be deemed to be
     a new registration  statement  relating to the securities  offered therein,
     and the offering of such  securities at that time shall be deemed to be the
     initial bona fide offering thereof.

          (4) To remove from registration by means of a post-effective amendment
     any  of  the  securities  being  registered  which  remain  unsold  at  the
     termination of the offering.

          (5) To send by first  class  mail or other  means  designed  to ensure
     equally prompt  delivery,  within two business days of receipt of a written
     or oral request, any Statement of Additional Information.

                                      II-4



<PAGE>
<PAGE>

   

                                   SIGNATURES

        Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant has duly caused this
Post-Effective Amendment to the Registration Statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of New York
and State of New York, on the 30th day of May, 1997.

                             INSURED MUNICIPAL INCOME FUND INC.

                             By:  /s/ Gregory K. Todd
                                ------------------------------------------
                                    Gregory K. Todd
                                    Vice President and Assistant Secretary

        Pursuant to the requirements of the Securities Act of 1933, this
Post-Effective Amendment has been signed below by the following persons in the
capacities and on the dates indicated:

<TABLE>
<CAPTION>

Signature                                   Title                                 Date
- ---------                                   -----                                 ----

<S>                                         <C>                                   <C>
/s/ Margo N. Alexander                      President and Director                May 30, 1997
- --------------------------                  (Chief Executive Officer)
Margo N. Alexander *

/s/ E. Garrett Bewkes, Jr.                  Director and Chairman                 May 30, 1997
- --------------------------                  of the Board of Directors
E. Garrett Bewkes, Jr. *                    
                                            
/s/ Richard Q. Armstrong                    Director                              May 30, 1997
- --------------------------
Richard Q. Armstrong *

/s/ Richard Burt                            Director                              May 30, 1997
- --------------------------
Richard Burt *

/s/ Mary C. Farrell                         Director                              May 30, 1997
- --------------------------
Mary C. Farrell *

/s/ Meyer Feldberg                          Director                              May 30, 1997
- --------------------------
Meyer Feldberg *

/s/ George W. Gowen                         Director                              May 30, 1997
- --------------------------
George W. Gowen *

/s/ Frederic V. Malek                       Director                              May 30, 1997
- --------------------------
Frederic V. Malek *

/s/ Carl W. Schafer                         Director                              May 30, 1997
- --------------------------
Carl W. Schafer *

/s/ Paul H. Schubert                        Vice President and Treasurer (Chief   May 30, 1997
- --------------------------                  Financial and Accounting Officer)
Paul H. Schubert

</TABLE>

    

<PAGE>
<PAGE>

   

                                    SIGNATURES (CONTINUED)

* Signature affixed by Robert A. Wittie pursuant to power of attorney dated
  May 21, 1996 and incorporated by reference from Post-Effective Amendment
  No. 25 to the Registration Statement of PaineWebber RMA Tax-Free Fund, SEC
  File No. 2-78310, filed June 27, 1996.
    

                              STATEMENT OF DIFFERENCES
                              ------------------------
             The dagger symbol shall be expressed as ............... `D'
             The copyright symbol shall be expressed as ............ 'c'



<PAGE>
<PAGE>



                       INSURED MUNICIPAL INCOME FUND INC.

                                  EXHIBIT INDEX

  EXHIBIT                          DOCUMENT DESCRIPTION
  -------                          --------------------

   
    a.  (i)   Articles of Incorporation [filed previously as exhibit a.(i) to
              Post-Effective Amendment No. 2 to the Registration Statement on
              Form N-2 filed June 15, 1995 (File No. 33-58532)]

        (ii)  Articles Supplementary dated August 5, 1993 [filed previously as
              exhibit a.(ii) to Post-Effective Amendment No. 2 to the
              Registration Statement  on Form N-2 filed June 15, 1995 (File No.
              33-58532)]

        (iii) Articles Supplementary dated November 28, 1994 [filed previously
              as exhibit a.(iii) to Post-Effective Amendment No. 2 to the
              Registration Statement on Form N-2 filed June 15, 1995 (File No.
              33-58532)]

        (iv)  Articles of Amendment dated April 12, 1996 [filed previously as
              exhibit a.(iv) to Post-Effective Amendment No. 3 to the
              Registration Statement on Form N-2 filed May 31, 1996 (File No.
              33-58532)]

    b.  Bylaws [previously filed as exhibit 2 to the Registration Statement on
        Form N-2 filed February 19, 1993 (File No. 33-58532)]

    c.  None

    d.  Inapplicable

    e.  Dividend Reinvestment Plan [previously filed as exhibit 5 to
        Pre-Effective Amendment No. 2 to the Registration Statement on Form N-2
        filed May 27, 1993 (File No. 33-58532)]

    f.  None

    g.  Investment Advisory and Administration Contract [previously filed as
        exhibit g. to Post-Effective Amendment No. 1 to the Registration
        Statement on Form N-2 filed July 25, 1994 (File No. 33-58532)]

    h.  None

    i.  None

    j.  (i)   Custodian Agreement [previously filed as exhibit j. to
              Post-Effective Amendment No. 1 to the Registration Statement on
              Form N-2 filed July 25, 1994 (File No. 33-58532)]

        (ii)  Letter Agreement between the Fund and The Depository Trust Company
              dated  8/12/93 [filed previously as exhibit j.(ii) to
              Post-Effective Amendment No. 2 to the Registration Statement on
              Form N-2 filed June 15, 1995 (File No. 33-58532)]

        (iii) Letter Agreement between the Fund and The Depository Trust Company
              dated  11/28/94 [filed previously as exhibit j.(iii) to
              Post-Effective Amendment No. 2 to the Registration Statement on
              Form N-2 filed June 15, 1995 (File No. 33-58532)]

    k.  (i)   Transfer Agency Agreement [previously filed as exhibit k.(i) to
              Post-Effective Amendment No. 1 to the Registration Statement on
              Form N-2 filed July 25, 1994 (File No. 33-58532)]

        (ii)  Broker-Dealer Agreement between Bankers Trust Company and Goldman,
              Sachs & Co. dated 8/12/93 [filed previously as exhibit k.(ii) to
              Post-Effective Amendment No. 2 to the Registration Statement on
              Form N-2 filed June 15, 1995 (File No. 33-58532)]

    


<PAGE>
<PAGE>

   



        (iii) Broker-Dealer Agreement between Bankers Trust Company  and
              PaineWebber Incorporated dated 8/12/93 [filed previously as
              exhibit k.(iii) to Post-Effective Amendment No. 2 to the
              Registration Statement on Form N-2 filed June 15, 1995 (File No.
              33-58532)]

        (iv)  Auction Agency Agreement between the Fund and Bankers Trust
              Company dated 8/12/93 [filed previously as exhibit k.(iv) to
              Post-Effective Amendment No. 2 to the Registration Statement on
              Form N-2 filed June 15, 1995 (File No. 33-58532)]

        (v)   Broker-Dealer Agreement between Bankers Trust Company and Goldman,
              Sachs & Co. dated 11/28/94 [filed previously as exhibit k.(v) to
              Post-Effective Amendment No. 2 to the Registration Statement on
              Form N-2 filed June 15, 1995 (File No. 33-58532)]

        (vi)  Broker-Dealer Agreement between Bankers Trust Company and
              PaineWebber Incorporated dated 11/28/94 [filed previously as
              exhibit k.(vi) to Post-Effective Amendment No. 2 to the
              Registration Statement on Form N-2 filed June 15, 1995 (File No.
              33-58532)]

        (vii) Auction Agency Agreement between the Fund and Bankers Trust
              Company dated 11/28/94 [filed previously as exhibit k.(vii) to
              Post-Effective Amendment No. 2 to the Registration Statement on
              Form N-2 filed June 15, 1995 (File No. 33-58532)]

    l.  Opinion and consent of counsel [previously  filed as exhibit 12 to the
        Pre-Effective Amendment No. 2 to the Registration Statement on Form N-2
        filed May 27, 1993 (File No. 33-58532)]

    m.  None

    n.  Consent of Independent Auditors (filed herewith)

    o.  None

    p.  Letter of Investment Intent [previously filed as exhibit 16 to
        Pre-Effective Amendment No. 2 to the Registration Statement on Form N-2
        filed May 27, 1993 (File No. 33-58532)]

    q.  None

    r.  Financial Data Schedule (filed herewith)

    


<PAGE>



<PAGE>

                      CONSENT OF INDEPENDENT AUDITORS

We consent to the reference to our firm under the captions "Financial
Highlights" in the Prospectus and "Independent Auditors" in the Statement
of Additional Information and to the incorporation by reference of our
report dated May 13, 1997, in this Registration Statement (Form N-2
No. 33-58532) of Insured Municipal Income Fund Inc.

                                              /s/ ERNST & YOUNG LLP
                                              ------------------------
                                              ERNST & YOUNG LLP

New York, New York
May 27, 1997





<PAGE>


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<PAGE>



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