WITTER DEAN NEW YORK TAX FREE INCOME FUND
497, 1997-03-19
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<PAGE>
                        DEAN WITTER
                        NEW YORK TAX-FREE INCOME FUND
                        PROSPECTUS--MARCH 13, 1997
 
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DEAN  WITTER  NEW  YORK  TAX-FREE  INCOME  FUND  (THE  "FUND")  IS  AN OPEN-END,
DIVERSIFIED MANAGEMENT  INVESTMENT  COMPANY  WHOSE INVESTMENT  OBJECTIVE  IS  TO
PROVIDE  A HIGH LEVEL OF CURRENT INCOME  EXEMPT FROM FEDERAL, NEW YORK STATE AND
NEW YORK CITY INCOME TAX, CONSISTENT WITH THE PRESERVATION OF CAPITAL. THE  FUND
INVESTS  PRINCIPALLY IN  NEW YORK  TAX-EXEMPT FIXED-INCOME  SECURITIES WHICH ARE
RATED IN  THE FOUR  HIGHEST CATEGORIES  BY MOODY'S  INVESTORS SERVICE,  INC.  OR
STANDARD & POOR'S CORPORATION. (SEE "INVESTMENT OBJECTIVE AND POLICIES.")
 
Shares  of the  Fund are  continuously offered  at net  asset value  without the
imposition of  a  sales  charge. However,  redemptions  and/or  repurchases  are
subject in most cases to a contingent deferred sales charge, scaled down from 5%
to 1% of the amount redeemed, if made within six years of purchase, which charge
will  be  paid to  the  Fund's Distributor,  Dean  Witter Distributors  Inc. See
"Redemptions and Repurchases--Contingent  Deferred Sales  Charge." In  addition,
the  Fund  pays  the  Distributor  a distribution  fee  pursuant  to  a  Plan of
Distribution pursuant to Rule 12b-1 under the Investment Company Act of 1940  at
the  annual rate of 0.75%  of the lesser of the  (i) average daily aggregate net
sales or (ii)  average daily  net assets  of the  Fund. See  "Purchases of  Fund
Shares--Plan of Distribution."
 
This  prospectus sets  forth concisely  the information  you should  know before
investing in the  Fund. It  should be read  and retained  for future  reference.
Additional  information  about  the  Fund  is  contained  in  the  Statement  of
Additional Information, dated  March 13,  1997, which  has been  filed with  the
Securities  and Exchange  Commission, and which  is available at  no charge upon
request of the Fund at the address or telephone numbers listed on this page. The
Statement of Additional Information is incorporated herein by reference.
 
<TABLE>
<CAPTION>
TABLE OF CONTENTS
 
<S>                                                 <C>
Prospectus Summary................................       2
 
Summary of Fund Expenses..........................       3
 
Financial Highlights..............................       4
 
The Fund and its Management.......................       5
 
Investment Objective and Policies.................       5
 
  Risk Considerations.............................       6
 
Investment Restrictions...........................       9
 
Purchase of Fund Shares...........................      10
 
Shareholder Services..............................      11
 
Redemptions and Repurchases.......................      13
 
Dividends, Distributions and Taxes................      15
 
Performance Information...........................      16
 
Additional Information............................      16
</TABLE>
 
SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK, AND THE SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT
INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD, OR ANY OTHER AGENCY.
 
DEAN WITTER
NEW YORK TAX-FREE INCOME FUND
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
 
(212) 392-2550 or 800) 869-NEWS (toll-free)
 
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  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
                   DEAN WITTER DISTRIBUTORS INC., DISTRIBUTOR
<PAGE>
PROSPECTUS SUMMARY
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<TABLE>
<S>               <C>
THE FUND          The  Fund is organized  as a Trust,  commonly known as  a Massachusetts business  trust, and is an
                  open-end, diversified management investment company  investing principally in New York  tax-exempt
                  fixed-income  securities  which are  rated in  the  four highest  categories by  Moody's Investors
                  Service Inc. or Standard and Poor's Corporation (see page 5).
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SHARES OFFERED    Shares of beneficial interest with $0.01 par value (see page 16).
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OFFERING          At net  asset value  without sales  charge (see  page 10).  Shares redeemed  within six  years  of
PRICE             purchase are subject to a contingent deferred sales charge under most circumstances (see page 13).
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MINIMUM           Minimum initial investment, $1,000 ($100 if the account is opened through EasyInvest-SM-); minimum
PURCHASE          subsequent investment, $100 (see page 10).
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INVESTMENT        The  investment objective of  the Fund is  to provide a  high level of  current income exempt from
OBJECTIVE         federal, New York State and New York City income tax, consistent with preservation of capital.
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INVESTMENT        The Fund will invest principally in New  York tax-exempt fixed-income securities. However, it  may
POLICIES          also  invest in taxable money market instruments,  non-New York tax-exempt securities, futures and
                  options.
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INVESTMENT        Dean Witter  InterCapital  Inc.,  the  Investment  Manager  of  the  Fund,  and  its  wholly-owned
MANAGER           subsidiary,  Dean Witter Services Company Inc.,  serve in various investment management, advisory,
                  management and administrative  capacities to 102  investment companies and  other portfolios  with
                  assets of approximately $93 billion at February 28, 1997 (see page 5).
- -------------------------------------------------------------------------------------------------------
MANAGEMENT        The  Investment Manager  receives a  monthly fee at  the annual  rate of 0.55  of 1%  of daily net
FEE               assets, scaled down on assets over $500 million. The fee should not be compared with fees paid  by
                  other  investment companies without also considering applicable sales loads and distribution fees,
                  including those noted below.
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DIVIDENDS         Dividends are declared daily, and either paid monthly as additional shares of the Fund or, at  the
                  shareholder's option, paid monthly in cash (see page 15).
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DISTRIBUTOR AND   Dean  Witter  Distributors  Inc. (the  "Distributor").  The  Distributor receives  from  the Fund,
DISTRIBUTION FEE  pursuant to  a Rule  12b-1 Plan  of Distribution,  a distribution  fee accrued  daily and  payable
                  monthly at the rate of 0.75% per annum of the lesser of (i) the Fund's average daily aggregate net
                  sales  or (ii) the Fund's average  daily net assets. This fee  compensates the Distributor for the
                  services provided in  distributing shares  of the  Fund and  for its  sales-related expenses.  The
                  Distributor also receives the proceeds of any contingent deferred sales charges (see pages 10).
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REDEMPTION        At  net asset value; redeemable involuntarily if the total value of the account is less than $100,
                  or, if the account was opened through  EasyInvest-SM-, if after twelve months the shareholder  has
                  invested  less than $1,000 in the account. (see page 18). Redemptions within six years of purchase
                  are subject to a contingent deferred sales charge under most circumstances (see page 13).
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CONTINGENT        Although no  commission or  sales charge  is imposed  upon the  purchase of  shares, a  contingent
DEFERRED SALES    deferred sales charge (scaled down from 5% to 1%) is imposed on any redemption of shares if, after
CHARGE            such redemption, the aggregate current value of an account with the Fund falls below the aggregate
                  amount  of the investor's  purchase payments made  during the six  years preceding the redemption.
                  However, there is  no charge imposed  on redemption  of shares purchased  through reinvestment  of
                  dividends or distributions (see pages 13-14).
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RISKS             The  value of the Fund's portfolio securities, and therefore the Fund's net asset value per share,
                  may increase or decrease due to various factors, principally changes in prevailing interest  rates
                  and the ability of the issuers of the Fund's portfolio securities to pay interest and principal on
                  such  obligations. The Fund also may invest in futures and options for portfolio hedging purposes.
                  Futures and options may  be considered speculative  in nature and may  involve greater risks  than
                  those  customarily  assumed by  certain other  investment companies  which do  not invest  in such
                  instruments. Since the Fund  concentrates its investments in  New York tax-exempt securities,  the
                  Fund  is affected by any  political, economic or regulatory  developments affecting the ability of
                  New York issuers to pay interest or repay principal (see pages 6-9).
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</TABLE>
 
  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
                                   ELSEWHERE
       IN THIS PROSPECTUS AND IN THE STATEMENT OF ADDITIONAL INFORMATION.
 
2
<PAGE>
SUMMARY OF FUND EXPENSES
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The following table illustrates all expenses that a shareholder of the Fund will
incur.  The expenses  and fees set  forth in the  table are for  the fiscal year
ended December 31, 1996.
 
<TABLE>
<CAPTION>
SHAREHOLDER TRANSACTION EXPENSES
<S>                                                 <C>
Maximum Sales Charge Imposed on Purchases.........   None
Maximum Sales Charge Imposed on Reinvested
 Dividends........................................   None
Deferred Sales Charge
 (as a percentage of the lesser of original
 purchase price or redemption proceeds)...........   5.0%
</TABLE>
 
 A contingent deferred sales charge is imposed at the following declining rates:
 
<TABLE>
<CAPTION>
YEAR SINCE PURCHASE PAYMENT MADE                    PERCENTAGE
- --------------------------------------------------  -----------
<S>                                                 <C>
First.............................................      5.0%
Second............................................      4.0%
Third.............................................      3.0%
Fourth............................................      2.0%
Fifth.............................................      2.0%
Sixth.............................................      1.0%
Seventh and thereafter............................     None
</TABLE>
 
<TABLE>
<S>                                                 <C>
Redemption Fees...................................   None
Exchange Fee......................................   None
 
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF
 AVERAGE NET ASSETS)
Management Fee....................................  0.55%
12b-1 Fees*.......................................  0.75%
Other Expenses....................................  0.11%
Total Fund Operating Expenses.....................  1.41%
<FN>
- ------------------------
* A portion  of the 12b-1  fee equal to  0.20% of the  Fund's average daily  net
  assets  is characterized as a  service fee within the  meaning of the National
  Association of Securities Dealers, Inc. ("NASD") guidelines (see "Purchase  of
  Fund Shares").
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                    10
EXAMPLE                                             1 YEAR    3 YEARS   5 YEARS    YEARS
- --------------------------------------------------  -------   -------   -------   -------
<S>                                                 <C>       <C>       <C>       <C>
You  would pay the following  expenses on a $1,000
 investment, assuming (1) 5% annual return and (2)
 redemption at the end of each time period........    $64       $75       $97       $169
You would pay the  following expenses on the  same
 investment, assuming no redemption...............    $14       $45       $77       $169
</TABLE>
 
THE  ABOVE EXAMPLE SHOULD NOT  BE CONSIDERED A REPRESENTATION  OF PAST OR FUTURE
EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF THE FUND MAY BE GREATER OR LESS THAN
THOSE SHOWN.
 
The purpose of this table is to assist the investor in understanding the various
costs and  expenses  that  an  investor  in  the  Fund  will  bear  directly  or
indirectly.  For a  more complete description  of these costs  and expenses, see
"The Fund  and  its Management,"  "Plan  of Distribution"  and  "Redemption  and
Repurchases."
 
Long-term   shareholders  of  the  Fund  may  pay  more  in  sales  charges  and
distribution fees than the  economic equivalent of  the maximum front-end  sales
charge permitted by the NASD.
 
                                                                               3
<PAGE>
FINANCIAL HIGHLIGHTS
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The  following ratios  and per  share data  for a  share of  beneficial interest
outstanding throughout each period  have been audited  by Price Waterhouse  LLP,
independent  accountants. The financial highlights should be read in conjunction
with the  financial statements,  notes  thereto and  the unqualified  report  of
independent  accountants  which are  contained  in the  Statement  of Additional
Information. Further information about the performance of the Fund is  contained
in  the  Fund's Annual  Report to  Shareholders, which  may be  obtained without
charge upon request from the Fund.
 
<TABLE>
<CAPTION>
                                                       FOR THE YEAR ENDED DECEMBER 31
                        ---------------------------------------------------------------------------------------------
                         1996      1995     1994     1993     1992     1991     1990      1989      1988       1987
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
<S>                     <C>       <C>      <C>      <C>      <C>      <C>      <C>       <C>       <C>       <C>
PER SHARE OPERATING
  PERFORMANCE:
Net asset value,
  beginning of
  period..............  $11.96    $10.83   $12.50   $11.98   $11.68   $11.00   $11.25    $10.94    $10.50    $11.57
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
  Net investment
   income.............   0.53      0.55     0.57     0.65     0.65     0.68      0.68      0.68      0.68      0.70
  Net realized and
   unrealized gain
   (loss).............  (0.21)     1.20    (1.51)    0.72     0.34     0.70     (0.25)     0.31      0.44     (0.93)
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
  Total from
   investment
   operations.........   0.32      1.75    (0.94)    1.37     0.99     1.38      0.43      0.99      1.12     (0.23)
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
  Less dividends and
   distributions from:
    Net investment
     income...........  (0.53)    (0.54)   (0.57)   (0.65)   (0.65)   (0.68)    (0.68)    (0.68)    (0.67)    (0.70)
    Net realized
     gain.............  (0.04)    (0.08)   (0.16)   (0.20)   (0.04)   (0.02)     --        --       (0.01)    (0.14)
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
  Total dividends and
   distributions......  (0.57)    (0.62)   (0.73)   (0.85)   (0.69)   (0.70)    (0.68)    (0.68)    (0.68)    (0.84)
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
  Net asset value, end
   of period..........  $11.71    $11.96   $10.83   $12.50   $11.98   $11.68   $11.00    $11.25    $10.94    $10.50
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
TOTAL INVESTMENT
  RETURN+.............   2.82%    16.59%   (7.74)%  11.72%    8.70%   12.94%     4.01%     9.34%    10.91%    (1.89)%
  Ratios to average
   net assets:
    Expenses..........   1.40%(1)  1.42%(1)  1.40%   1.27%    1.40%    1.32%     1.37%     1.37%     1.41%     1.40%
    Net investment
     income...........   4.54%     4.70%    4.96%    5.20%    5.48%    6.00%     6.13%     6.09%     6.28%     6.44%
SUPPLEMENTAL DATA:
  Net assets, end of
   period, in
   millions...........   $192      $217     $207     $246     $209     $182      $158      $147      $129      $113
  Portfolio turnover
   rate...............     16%       17%      10%      25%      16%      17%       23%        4%       18%       40%
</TABLE>
 
- ------------------------------
+ DOES NOT REFLECT THE DEDUCTION OF SALES CHARGE. CALCULATED BASED ON THE NET
  ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE PERIOD.
(1) THE ABOVE RATIOS DO NOT REFLECT THE EFFECT OF EXPENSE OFFSETS OF 0.01%.
 
4
<PAGE>
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
Dean Witter  New  York  Tax-Free  Income  Fund  (the  "Fund")  is  an  open-end,
diversified  management  investment company.  The Fund  is a  trust of  the type
commonly known as a "Massachusetts business  trust" and was organized under  the
laws of Massachusetts on January 17, 1985.
 
    Dean  Witter InterCapital Inc. ("InterCapital" or the "Investment Manager"),
whose address is Two World Trade Center, New York, New York 10048, is the Fund's
Investment Manager.  The Investment  Manager, which  was incorporated  in  July,
1992,  is a wholly-owned subsidiary  of Dean Witter, Discover  & Co. ("DWDC"), a
balanced financial services organization providing  a broad range of  nationally
marketed credit and investment products.
 
    InterCapital  and its wholly-owned subsidiary,  Dean Witter Services Company
Inc.,  serve  in  various   investment  management,  advisory,  management   and
administrative  capacities to  a total  of 102  investment companies,  thirty of
which are listed  on the  New York Stock  Exchange, with  combined total  assets
including  this Fund of approximately $89.8 billion as of February 28, 1997. The
Investment Manager also manages portfolios of pension plans, other  institutions
and individuals which aggregated approximately $3.2 billion at such date.
 
    On  February 5, 1997, DWDC and Morgan Stanley Group Inc. announced that they
had entered into an Agreement and Plan  of Merger, with the combined company  to
be  named Morgan  Stanley, Dean  Witter, Discover &  Co. The  business of Morgan
Stanley Group Inc.  and its affiliated  companies is providing  a wide range  of
financial  services  for sovereign  governments, corporations,  institutions and
individuals throughout the world. DWDC is the direct parent of InterCapital  and
Dean   Witter  Distributors  Inc.,  the  Fund's  distributor.  It  is  currently
anticipated  that   the  transaction   will  close   in  mid-1997.   Thereafter,
InterCapital  and Dean Witter  Distributors Inc. will  be direct subsidiaries of
Morgan Stanley, Dean Witter, Discover & Co.
 
    The Fund  has  retained the  Investment  Manager to  provide  administrative
services,  manage its business  affairs and manage the  investment of the Fund's
assets, including the placing of orders  for the purchase and sale of  portfolio
securities.  InterCapital  has retained  Dean  Witter Services  Company  Inc. to
perform the  aforementioned administrative  services for  the Fund.  The  Fund's
Board  of  Trustees  reviews  the  various services  provided  by  or  under the
direction of the Investment Manager to ensure that the Fund's general investment
policies and programs  are being  properly carried out  and that  administrative
services are being provided to the Fund in a satisfactory manner.
 
    As  full compensation for the services  and facilities furnished to the Fund
and for expenses of the  Fund assumed by the  Investment Manager, the Fund  pays
the  Investment Manager  monthly compensation  calculated daily  by applying the
following annual rates to the net assets of the Fund determined as of the  close
of each business day: 0.55% of the portion of the daily net assets not exceeding
$500  million and 0.525% of  the portion of the  daily net assets exceeding $500
million. For the  fiscal year ended  December 31, 1996,  the Fund accrued  total
compensation  to the Investment Manager amounting to 0.55% of the Fund's average
daily net assets and the Fund's total  expenses amounted to 1.41% of the  Fund's
average daily net assets.
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
The  investment objective  of the  Fund is  to provide  a high  level of current
income which is exempt  from federal, New  York State and  New York City  income
tax,  consistent with  the preservation of  capital. There is  no assurance that
this objective  will be  achieved.  The Fund  seeks  to achieve  its  investment
objective by investing its assets in accordance with the following policies:
 
    1.   As a  fundamental policy the Fund  must have at least  80% of its total
assets invested in New York tax-exempt securities, except as stated in paragraph
(3) below. New  York tax-exempt securities  consist of obligations  of New  York
State,  its political subdivisions, authorities and corporations, as well as any
debt obligations (certain governmental entities  and territories such as  Puerto
Rico, Guam and the Virgin Islands) that generate interest income which is exempt
from federal, New York State and New York City income taxes. New York tax-exempt
securities   consist  of   Municipal  Bonds  and   Municipal  Notes  ("Municipal
Obligations")  and  Municipal  Commercial   Paper.  Only  New  York   tax-exempt
securities  which satisfy the following standards  may be purchased by the Fund:
(a) Municipal Bonds  which are rated  at the  time of purchase  within the  four
highest  grades by  Moody's Investors  Service, Inc.  ("Moody's") or  Standard &
Poor's Corporation ("S&P"); (b) Municipal Notes of issuers which at the time  of
purchase  are rated  in the  two highest grades  by Moody's  or S&P,  or, if not
rated, have outstanding one or more issues of Municipal Bonds rated as set forth
in clause (a)  of this paragraph;  (c) Municipal Commercial  Paper which at  the
time  of  purchase is  rated  P-1 by  Moody's  or A-1  by  S&P; and  (d) unrated
securities which at the time of purchase are judged by the Investment Manager to
be of comparable quality to the securities described above. For a description of
Moody's and  S&P's ratings,  see the  Appendix to  the Statement  of  Additional
Information.
 
    2.   In accordance with the current  position of the staff of the Securities
and Exchange Commission, tax-exempt securities which are subject to the  federal
alternative
mini-
 
                                                                               5
<PAGE>
mum  tax for  individual shareholders  ("AMT") will not  be included  in the 80%
total described in paragraph 1 above. (See "Dividends, Distributions and Taxes,"
page 15.) As  such, the  remaining portion  of the  Fund's total  assets may  be
invested in tax-exempt securities subject to the AMT.
 
    3.   Up to 20% of  the Fund's total assets may  be invested in taxable money
market instruments, non-New York tax-exempt securities, futures and options  and
tax-exempt  securities subject  to the  AMT. However,  the Fund  may temporarily
invest more than 20%  of its total assets  in taxable money market  instruments,
non-New York tax-exempt securities and tax-exempt securities subject to the AMT,
in  order  to  maintain  a  "defensive" posture  when,  in  the  opinion  of the
Investment Manager, it is advisable to do so because of market conditions.  Only
those  non-New York tax-exempt securities which  satisfy the standards set forth
in paragraph (1)  for New  York tax-exempt securities  may be  purchased by  the
Fund. The types of taxable money market instruments in which the Fund may invest
are limited to the following short-term fixed income securities (maturing in one
year  or less from the  time of purchase): (i)  obligations of the United States
Government, its  agencies,  instrumentalities or  authorities;  (ii)  commercial
paper rated P-1 or higher by Moody's or A-1 or higher by S&P; (iii) certificates
of  deposit  of domestic  banks  with assets  of $1  billion  or more;  and (iv)
repurchase agreements with respect to portfolio securities.
 
    Municipal  Obligations  are  debt  obligations  of  a  state,  its   cities,
municipalities  and municipal agencies  which generally have  maturities, at the
time of their issuance, of either one year or more (Bonds) or from six months to
three years (Notes). Municipal Commercial Paper is a short-term obligation of  a
municipality.  Any Municipal Obligation which  depends directly or indirectly on
the credit of the Federal Government, its agencies or instrumentalities shall be
considered to have a rating of Aaa/AAA. An obligation shall be considered a  New
York  tax-exempt security only if, in the  opinion of bond counsel, the interest
payable thereon is exempt from federal, New York State and New York City  income
tax.  The Fund may also purchase Municipal Obligations which had originally been
issued by  the  same issuer  as  two separate  series  of the  same  issue  with
different interest rates, but which are now linked together to form one series.
 
    The  two principal  classifications of Municipal  Obligations and Commercial
Paper are "general obligation" and  "revenue" bonds, notes or commercial  paper.
General  obligation bonds, notes or commercial paper are secured by the issuer's
pledge of its faith, credit  and taxing power for  the payment of principal  and
interest. Issuers of general obligation bonds, notes or commercial paper include
a  state,  its counties,  cities, towns  and  other governmental  units. Revenue
bonds, notes or commercial  paper are payable from  the revenues derived from  a
particular  facility or  class of  facilities or,  in some  cases, from specific
revenue sources. Revenue bonds, notes or commercial paper are issued for a  wide
variety  of purposes, including the financing  of electric, gas, water and sewer
systems and other public utilities; industrial development and pollution control
facilities;  single  and  multi-family  housing  units;  public  buildings   and
facilities;  air and marine ports; transportation facilities such as toll roads,
bridges and tunnels; and health and educational facilities such as hospitals and
dormitories. They rely primarily on user fees to pay debt service, although  the
principal  revenue source is often  supplemented by additional security features
which are intended to enhance the creditworthiness of the issuer's  obligations.
In  some cases, particularly revenue bonds  issued to finance housing and public
buildings, a direct or implied "moral obligation" of a governmental unit may  be
pledged  to the payment of debt service. In  other cases, a special tax or other
charge may augment user fees.
 
RISK CONSIDERATIONS
 
Investments in  municipal  bonds rated  either  Baa by  Moody's  or BBB  by  S&P
(investment  grade bonds--the lowest rated  permissible investments by the Fund)
may  have  speculative  characteristics  and,  therefore,  changes  in  economic
conditions  or other circumstances  are more likely to  weaken their capacity to
make principal and interest payments than would be the case with investments  in
securities with higher credit ratings.
 
    Included   within  the  revenue  category   of  bonds  described  above  are
participations  in   lease  obligations   or  installment   purchase   contracts
(hereinafter  collectively called "lease  obligations") of municipalities. State
and  local  governments  issue  lease  obligations  to  acquire  equipment   and
facilities.
 
    Lease  obligations  may  have  risks not  normally  associated  with general
obligation  or  other  revenue  bonds.   Leases  and  installment  purchase   or
conditional  sale contracts (which may provide for  title to the leased asset to
pass eventually  to the  issuer)  have developed  as  a means  for  governmental
issuers  to acquire  property and equipment  without the  necessity of complying
with the constitutional and statutory requirements generally applicable for  the
issuance  of debt. Certain lease obligations contain "non-appropriation" clauses
that provide  that the  governmental issuer  has no  obligation to  make  future
payments  under  the lease  or contract  unless money  is appropriated  for such
purpose by  the appropriate  legislative body  on an  annual or  other  periodic
basis.  Consequently,  continued  lease  payments  on  those  lease  obligations
containing "non-appropriation"  clauses  are  dependent  on  future  legislative
actions.  If such  legislative actions  do not occur,  the holders  of the lease
obligation may  experience  difficulty  in exercising  their  rights,  including
disposition of the property.
 
    Lease  obligations represent a type of financing that may not have the depth
of marketability associated with  more conventional municipal obligations,  and,
as  a  result, certain  of  such lease  obligations  may be  considered illiquid
 
6
<PAGE>
securities. To determine whether or not  the Fund will consider such  securities
to  be illiquid (the Fund may not invest more than ten percent of its net assets
in illiquid securities), the Trustees of the Fund have established guidelines to
be utilized by the Fund in determining the liquidity of a lease obligation.  The
factors  to be considered in making  the determination include: 1) the frequency
of trades and quoted prices for the obligation; 2) the number of dealers willing
to purchase or sell the security  and the number of other potential  purchasers;
3) the willingness of dealers to undertake to make a market in the security; and
4)  the nature of the marketplace trades,  including, the time needed to dispose
of the  security, the  method of  soliciting offers,  and the  mechanics of  the
transfer.
 
    The  value of the Fund's portfolio  securities, and therefore the Fund's net
asset value  per  share,  may  increase or  decrease  due  to  various  factors,
principally  changes in prevailing interest rates and the ability of the issuers
of the  Fund's  portfolio securities  to  pay  interest and  principal  on  such
obligations on a timely basis. Generally a rise in interest rates will result in
a  decrease in the  Fund's net asset value  per share, while  a drop in interest
rates will result in an increase in the Fund's net asset value per share.
 
VARIABLE RATE OBLIGATIONS.  The interest rates payable on certain securities  in
which  the Fund may invest are not fixed and may fluctuate based upon changes in
market rates. Obligations of this  type are called "variable rate"  obligations.
The  interest rate payable on  a variable rate obligation  is adjusted either at
predesignated periodic intervals  or whenever there  is a change  in the  market
rate of interest on which the interest rate payable is based.
 
WHEN-ISSUED  AND DELAYED DELIVERY SECURITIES AND FORWARD COMMITMENTS.  From time
to time, in the ordinary course of business, the Fund may purchase securities on
a when-issued or delayed delivery basis, or may purchase or sell securities on a
forward commitment basis. When  such transactions are  negotiated, the price  is
fixed  at the time of the commitment, but  delivery and payment can take place a
month or more after the date of the commitment. There is no overall limit on the
percentage of  the Fund's  assets which  may  be committed  to the  purchase  of
securities  on a when-issued,  delayed delivery or  forward commitment basis. An
increase in the  percentage of the  Fund's assets committed  to the purchase  of
securities  on a when-issued,  delayed delivery or  forward commitment basis may
increase the volatility of the Fund's net asset value.
 
ZERO COUPON SECURITIES.  A portion  of the fixed-income securities purchased  by
the  Fund may  be zero  coupon securities.  Such securities  are purchased  at a
discount from their face amount, giving the purchaser the right to receive their
full value at maturity. The interest  earned on such securities is,  implicitly,
automatically  compounded and paid out at  maturity. While such compounding at a
constant rate eliminates the risk of receiving lower yields upon reinvestment of
interest if  prevailing interest  rates  decline, the  owner  of a  zero  coupon
security  will be  unable to participate  in higher yields  upon reinvestment of
interest received  on interest-paying  securities if  prevailing interest  rates
rise.
 
    A  zero coupon  security pays  no interest  to its  holder during  its life.
Therefore, to the extent the Fund invests in zero coupon securities, it will not
receive current cash  available for distribution  to shareholders. In  addition,
zero  coupon securities are subject  to substantially greater price fluctuations
during periods  of  changing  prevailing  interest  rates  than  are  comparable
securities  which  pay interest  on  a current  basis.  Current federal  tax law
requires that a holder  (such as the  Fund) of a zero  coupon security accrue  a
portion  of the discount at which the security was purchased as income each year
even though  the Fund  receives no  interest payments  in cash  on the  security
during the year.
 
    The Fund may enter into financial futures contracts, options on such futures
and municipal bond index futures contracts for hedging purposes.
 
FINANCIAL  FUTURES CONTRACTS  AND OPTIONS  ON FUTURES.   The Fund  may invest in
financial futures contracts  and related options  thereon. The Fund  may sell  a
financial  futures contract, or purchase a  put option on such futures contract,
if the Investment Manager anticipates interest rates to rise, as a hedge against
a decrease in the  value of the Fund's  portfolio securities. If the  Investment
Manager  anticipates that interest  rates will decline, the  Fund may purchase a
financial futures  contract or  a  call option  thereon  to protect  against  an
increase  in the  price of  the securities the  Fund intends  to purchase. These
futures contracts  and related  options thereon  will be  used only  as a  hedge
against  anticipated interest rate  changes. A futures  contract sale creates an
obligation by the Fund,  as seller, to deliver  the specific type of  instrument
called  for in the contract at a specified  future time for a specified price. A
futures contract purchase would create an obligation by the Fund, as  purchaser,
to  take delivery of  the specific type  of financial instrument  at a specified
future time at a  specified price. The specific  securities delivered or  taken,
respectively,  at settlement  date, would not  be determined until  or near that
date. The determination would be in accordance with the rules of the exchange on
which the futures contract sale or purchase was effected.
 
    Although the terms of financial futures contracts specify actual delivery or
receipt of securities, in most instances the contracts are closed out before the
settlement date without  the making  or taking  of delivery  of the  securities.
Closing  out of a  futures contract is  effected by entering  into an offsetting
purchase or sale transaction.
 
    Unlike a financial futures contract, which  requires the parties to buy  and
sell a security on a set date, an option on such a futures contract entitles its
holder  to  decide on  or before  a future  date  whether to  enter into  such a
contract (a long position in the case of  a call option and a short position  in
the case of a put option). If the holder decides not to enter into the contract,
the premium paid for the option on
 
                                                                               7
<PAGE>
the  contract is lost.  Since the value of  the option is fixed  at the point of
sale, there are no daily payments of cash to reflect the change in the value  of
the  underlying  contract as  there is  by a  purchaser or  seller of  a futures
contract. The value of the option does change and is reflected in the net  asset
value of the Fund.
 
    A risk in employing financial futures contracts to protect against the price
volatility  of portfolio securities is that  the prices of securities subject to
futures contracts may correlate imperfectly with the behavior of the cash prices
of the Fund's portfolio  securities. The risk of  imperfect correlation will  be
increased  by the fact  that financial futures  contracts in which  the Fund may
invest are on taxable securities rather than on tax-exempt securities, and there
is no guarantee that  the prices of  taxable securities will  move in a  similar
manner  to the prices of tax-exempt securities. The correlation may be distorted
by the fact that the futures  market is dominated by short-term traders  seeking
to profit from the difference between a contract or security price objective and
their  cost of  borrowed funds. Such  distortions are generally  minor and would
diminish as the contract approached maturity.
 
    Another  risk  is  that  the  Fund's  manager  could  be  incorrect  in  his
expectations as to the direction or extent of various interest rate movements or
the  time span within which  the movements take place.  For example, if the Fund
sold financial futures contracts for the  sale of securities in anticipation  of
an  increase  in interest  rates,  and then  interest  rates went  down instead,
causing bond prices to rise, the Fund would lose money on the sale.
 
    In addition to  the risks that  apply to all  options transactions (see  the
Statement of Additional Information for a description of the characteristics of,
and  the risks of investing  in, options on debt  securities), there are several
special risks relating  to options  on futures;  in particular,  the ability  to
establish  and  close out  positions  on such  options  will be  subject  to the
development and maintenance of a liquid secondary market. It is not certain that
this market will develop or be maintained.
 
MUNICIPAL BOND INDEX FUTURES.  The Fund may utilize municipal bond index futures
contracts  for  hedging  purposes.  The  Fund's  strategies  in  employing  such
contracts  will be  similar to  that discussed  above with  respect to financial
futures and options thereon. A municipal bond index is a method of reflecting in
a single  number the  market value  of  many different  municipal bonds  and  is
designed  to be representative of the municipal bond market generally. The index
fluctuates in response  to changes in  the market values  of the bonds  included
within  the index. Unlike futures contracts on particular financial instruments,
transactions in futures on a  municipal bond index will  be settled in cash,  if
held until the close of trading in the contract. However, like any other futures
contract, a position in the contract may be closed out by purchase or sale of an
offsetting  contract  for the  same delivery  month prior  to expiration  of the
contract.
 
    The Fund may not enter into futures contracts or related options thereon  if
immediately  thereafter the amount committed to  margin plus the amount paid for
option premiums exceeds 5% of the value of the Fund's total assets. The Fund may
not purchase  or  sell  futures  contracts or  related  options  if  immediately
thereafter more than one-third of its net assets would be hedged.
 
    Except as specified, the investment policies noted above are not fundamental
policies and may be changed without shareholder approval.
 
RISK CONSIDERATIONS RELATING TO NEW YORK TAX-EXEMPT SECURITIES
 
Since  the Fund concentrates its investments  in New York tax-exempt securities,
the Fund  is affected  by  any political,  economic or  regulatory  developments
affecting  the ability of New  York tax-exempt issuers to  pay interest or repay
principal. Investors should be aware that certain issuers of New York tax-exempt
securities have experienced  serious financial difficulties  in recent years.  A
reoccurrence  of these difficulties  may impair the ability  of certain New York
issuers to maintain debt service on their obligations.
 
    The fiscal  stability of  New York  State (the  "State") is  related to  the
fiscal  stability of  the State's  municipalities, its  Agencies and Authorities
(which generally finance, construct and operate revenue-producing public benefit
facilities). This is  due in  part to the  fact that  Agencies, Authorities  and
local  governments in financial  trouble often seek  State financial assistance.
The experience  has been  that if  New  York City  (the "City")  or any  of  the
Agencies  or Authorities suffers serious  financial difficulty, both the ability
of the State, the City, the State's political subdivisions, the Agencies and the
Authorities to obtain  financing in  the public  credit markets  and the  market
price of outstanding New York tax-exempt securities are adversely affected.
 
    Over the long term, the State and City face potential economic problems. The
City accounts for a large portion of the State's population and personal income,
and  the City's financial  health affects the  State in numerous  ways. The City
continues to require significant financial  assistance from the State. The  City
depends  on State aid both to enable the  City to balance its budget and to meet
its cash requirements. The State  could also be affected  by the ability of  the
City to market its securities successfully in the public credit markets.
 
    The  economic and financial condition  of the State also  may be affected by
various financial, social, economic and  political factors. Such factors can  be
very  complex, may vary from  fiscal year to fiscal  year and are frequently the
result  of  actions  taken  not  only   by  the  State  and  its  agencies   and
instrumentalities,  but also by  entities, such as  the Federal government, that
are not under the control of the State.
 
    On January 13, 1992,  Standard & Poor's reduced  its ratings on the  State's
general obligation bonds from A to
 
8
<PAGE>
A-  and, in addition, reduced its ratings on the State's moral obligation, lease
purchase, guaranteed and  contractual obligation  debt. Standard  & Poor's  also
continued  its negative  rating outlook  assessment on  State general obligation
debt. On April 26, 1993, Standard & Poor's revised the rating outlook assessment
to stable.  On  February 14,  1994,  Standard &  Poor's  raised its  outlook  to
positive  and, on August 5,  1996, confirmed its A-  rating. On January 6, 1992,
Moody's  reduced  its  ratings  on  outstanding  limited-liability  State  lease
purchase  and contractual obligations from A to  Baa1. On July 26, 1996, Moody's
reconfirmed  its  A   rating  on  the   State's  general  obligation   long-term
indebtedness.
 
    For  a  more detailed  discussion  of the  risks  of investing  in  New York
tax-exempt securities, see the Statement of Additional Information.
 
    The summary information furnished above  and in the Statement of  Additional
Information  is based on official statements prepared  by the State and the City
in connection with their  borrowings and contains such  information as the  Fund
deems  relevant in considering an investment in the Fund. It does not purport to
be a complete description of the considerations contained therein. The  official
statements  relied on are dated  January 24, 1996 with  respect to the State and
December 21,  1995 with  respect to  the City,  and the  information therein  is
subject to change after such dates.
 
PORTFOLIO MANAGEMENT
 
The  Fund is  managed by  the Investment  Manager with  a view  to achieving its
investment objective. In determining which  securities to purchase for the  Fund
or hold in the Fund's portfolio, the Investment Manager will rely on information
from various sources, including research, analysis and appraisals of brokers and
dealers,  including Dean Witter Reynolds Inc. ("DWR"), a broker-dealer affiliate
of InterCapital; the views of Trustees of the Fund and others regarding economic
developments and interest rate trends; and the Investment Manager's own analysis
of factors  it  deems  relevant.  The  Fund  is  managed  within  InterCapital's
Tax-Exempt   Group,  which  manages  40  tax-exempt  municipal  funds  and  fund
portfolios, with approximately $10.8 billion in  assets as of January 30,  1997.
James  F.  Willison,  Senior  Vice  President  of  InterCapital  and  Manager of
InterCapital's  Municipal  Fixed-Income  Group,  and  Joseph  R.  Arcieri,  Vice
President  of InterCapital and a member of InterCapital's Municipal Fixed-Income
Group, have  been  the primary  portfolio  co-managers  of the  Fund  since  its
inception  and February, 1997, respectively, and have been portfolio managers at
InterCapital for over five years.
 
    Securities are purchased and sold principally in response to the  Investment
Manager's current evaluation of an issuer's ability to meet its debt obligations
in the future, and the Investment Manager's current assessment of future changes
in  the levels of interest rates on tax-exempt securities of varying maturities,
qualities and purpose. Securities purchased by the Fund are, generally, sold  by
dealers acting as principal for their own accounts.
 
    Pursuant  to an order issued by  the Securities and Exchange Commission, the
Fund  may  effect  principal  transactions  in  certain  taxable  money   market
instruments  with DWR. In addition, the  Fund may incur brokerage commissions on
transactions conducted through DWR.
 
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
The investment restrictions listed  below are among  the restrictions that  have
been  adopted by the Fund as  fundamental policies. Under the Investment Company
Act of 1940, as  amended (the "Act"),  a fundamental policy  may not be  changed
without the vote of a majority of the outstanding voting securities of the Fund,
as defined in the Act.
 
    The Fund may not:
 
        1.  With respect to 75% of its  total assets, purchase securities of any
    issuer if immediately  thereafter more than  5% of the  Fund's total  assets
    would  be  invested in  securities of  such  issuer (other  than obligations
    issued or  guaranteed  by the  United  States Government,  its  agencies  or
    instrumentalities   or  by   the  State  of   New  York   or  its  political
    subdivisions).
 
        2. Purchase more than 10% of all outstanding taxable debt securities  of
    any one issuer (other than obligations issued, or guaranteed as to principal
    and   interest,   by  the   United  States   Government,  its   agencies  or
    instrumentalities).
 
        3. Invest more than 25% of the  value of its total assets in  securities
    of  issuers  in  any  one  industry.  This  restriction  does  not  apply to
    obligations issued  or  guaranteed  by the  United  States  Government,  its
    agencies  or instrumentalities, or  issued by the  State of New  York or its
    political subdivisions (industrial development  and pollution control  bonds
    are  grouped into industries based upon the business in which the issuers of
    such obligations are engaged).
 
                                                                               9
<PAGE>
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
The Fund offers its shares for sale to the public on a continuous basis.  Shares
of   the  Fund   are  distributed   by  Dean   Witter  Distributors   Inc.  (the
"Distributor"),  an  affiliate  of  the   Investment  Manager,  pursuant  to   a
Distribution  Agreement between the Fund and  the Distributor and are offered by
DWR and other  dealers who  have entered  into agreements  with the  Distributor
("Selected  Broker-Dealers"). The principal executive  office of the Distributor
is located at Two World Trade Center, New York, New York 10048.
 
    The minimum initial purchase is $1,000. Subsequent purchases of $100 or more
may be made by sending a check, payable to Dean Witter New York Tax-Free  Income
Fund, directly to Dean Witter Trust Company ("Transfer Agent") at P.O. Box 1040,
Jersey  City,  New Jersey  07303  or by  contacting  a DWR  or  another Selected
Broker-Dealer account executive.  The minimum  initial purchase in  the case  of
investments through EasyInvest-SM-, an automatic purchase plan (see "Shareholder
Services"),  is $100, provided  that the schedule  of automatic investments will
result in investments totalling at least $1,000 within the first twelve  months.
Certificates for shares purchased will not be issued unless a request is made by
the  shareholder in writing to  the Transfer Agent. Shares  are sold through the
Distributor on a normal  three business day settlement  basis; that is,  payment
generally is due on or before the third business day (settlement date) after the
order  is placed with the Distributor. Shares  of the Fund purchased through the
Distributor or a Selected Broker-Dealer  are entitled to dividends beginning  on
the  next business day  following settlement date. Since  DWR and other Selected
Broker-Dealers forward investors'  funds on settlement  date, they will  benefit
from  the temporary use of the funds  when payment is made prior thereto. Shares
purchased through the Transfer Agent are entitled to dividends beginning on  the
next  business day following receipt of an  order. As noted above, orders placed
directly with the Transfer Agent must be accompanied by payment. Investors  will
be entitled to receive capital gains distributions if their order is received by
the   close  of  business  on  the  day  prior  to  the  record  date  for  such
distributions. The offering  price will be  the net asset  value per share  next
determined following receipt of an order (see "Determination of Net Asset Value"
below).  While no sales  charge is imposed  at the time  shares are purchased, a
contingent deferred sales charge may be  imposed at the time of redemption  (see
"Redemptions  and  Repurchases"). Sales  personnel  are compensated  for selling
shares of the Fund at the time of their sale by the Distributor and/or  Selected
Broker-Dealer.  In addition, some sales  personnel of the Selected Broker-Dealer
will receive various types of non-cash compensation as special sales incentives,
including trips, educational and/or business seminars and merchandise. The  Fund
and the Distributor reserve the right to reject any purchase orders.
 
ANALOGOUS  DEAN WITTER FUNDS.  The  Distributor and the Investment Manager serve
in the same capacities  for Dean Witter  Multi-State Municipal Series  Trust-New
York  Series,  an open-end  investment  company with  investment  objectives and
policies similar to those of the Fund. Unlike the Fund, however, shares of  Dean
Witter  Multi-State Municipal  Series Trust-New York  Series are  offered to the
public with  a sales  charge imposed  at the  time of  purchase, rather  than  a
contingent  deferred sales charge assessed upon  redemptions within six years of
purchase. These two Dean  Witter Funds have differing  fees and expenses,  which
will  affect performance. Investors  who would like to  receive a prospectus for
Dean Witter Multi-State Municipal Series  Trust-New York Series should call  the
telephone  numbers listed  on the  front cover of  this Prospectus,  or may call
their account executive for additional information.
 
PLAN OF DISTRIBUTION
 
The Fund has adopted a Plan of  Distribution, pursuant to Rule 12b-1 of the  Act
(the  "Plan"), under which the Fund pays the Distributor a fee, which is accrued
daily and payable monthly, at an annual rate of 0.75% of the lesser of: (a)  the
average  daily aggregate gross sales of the Fund's shares since the inception of
the  Fund  (not   including  reinvestments   of  dividends   or  capital   gains
distributions),  less the average daily aggregate  net asset value of the Fund's
shares redeemed  since the  Fund's inception  upon which  a contingent  deferred
sales  charge has been  imposed or waived,  or (b) the  Fund's average daily net
assets. Of the amount accrued under the Plan, 0.20% of the Fund's average  daily
net  assets is  characterized as a  service fee  within the meaning  of the NASD
guidelines. The service fee  is a payment made  for personal service and/or  the
maintenance  of shareholder accounts. The 12b-1 fee is treated by the Fund as an
expense in the year it is accrued. Amounts  paid under the Plan are paid to  the
Distributor to compensate it for the services provided and the expenses borne by
the  Distributor and others in the  distribution of the Fund's shares, including
the payment  of  commissions  for  sales of  the  Fund's  shares  and  incentive
compensation  to  and expenses  of  DWR and  its  affiliates and  other Selected
Broker-Dealers account executives and other  employees who engage in or  support
distribution  of shares or who  service shareholder accounts, including overhead
and telephone expenses;  printing and distribution  of prospectuses and  reports
used  in connection with the offering of the Fund's shares to other than current
shareholders; and preparation, printing and distribution of sales literature and
advertising materials. For  the fiscal year  ended December 31,  1996, the  Fund
accrued  payments under the Plan amounting  to $1,518,807, which amount is equal
to 0.75%  of the  Fund's  average daily  net assets  for  the fiscal  year.  The
payments  accrued under the Plan  were calculated pursuant to  clause (b) of the
compensation formula under the Plan.
 
    At any given time, the expenses of distributing shares of the Fund may be in
excess of the total of (i) the payments
 
10
<PAGE>
made by  the Fund  pursuant to  the Plan  and (ii)  the proceeds  of  contingent
deferred  sales  charges  paid  by  investors  upon  redemption  of  shares (see
"Redemptions and Repurchases--Contingent Deferred  Sales Charge"). For  example,
if  $1 million in expenses in distributing  shares of the Fund had been incurred
and $750,000 had been received  as described in (i)  and (ii) above, the  excess
expense would amount to $250,000. The Distributor has advised the Fund that such
excess   amount,  including  the  carrying   charge  described  above,  totalled
$2,741,726 at December  31, 1996, which  was equal  to 1.43% of  the Fund's  net
assets on such date.
 
    Because  there  is no  requirement under  the Plan  that the  Distributor be
reimbursed for all its  expenses or any requirement  that the Plan be  continued
from  year to year,  this excess amount  does not constitute  a liability of the
Fund. Although  there  is no  legal  obligation for  the  Fund to  pay  expenses
incurred  in excess of payments made under the  Plan, if for any reason the Plan
is terminated the Trustees  will consider at  that time the  manner in which  to
treat  such expenses.  Any cumulative expenses  incurred, but  not yet recovered
through distribution fees or contingent deferred  sales charges, may or may  not
be  recovered  through future  distribution  fees or  contingent  deferred sales
charges.
 
DETERMINATION OF NET ASSET VALUE
 
The net asset value per share of the Fund is determined once daily at 4:00  p.m.
New  York time on each day that the New York Stock Exchange is open (or, on days
when the New York Stock Exchange closes prior to 4 p.m., at such earlier  time),
by  taking the  value of  all assets of  the Fund,  subtracting its liabilities,
dividing by the number of shares outstanding and adjusting to the nearest  cent.
The  net asset value per share will not be determined on Good Friday and on such
other federal and  non-federal holidays as  are observed by  the New York  Stock
Exchange.
 
    Certain  of the Fund's portfolio securities may be valued for the Fund by an
outside independent pricing service approved by the Fund's Trustees. The service
utilizes a computerized grid matrix of tax-exempt securities and evaluations  by
its  staff  in determining  what it  believes is  the fair  value of  the Fund's
portfolio securities.  The  Board  believes  that  timely  and  reliable  market
quotations  are  generally not  readily available  to the  Fund for  purposes of
valuing tax-exempt securities and  that the valuations  supplied by the  pricing
service are more likely to approximate the fair value of such securities.
 
    Short-term  taxable debt securities with  remaining maturities of sixty days
or less to maturity at time of purchase are valued at amortized cost, unless the
Board determines such does  not reflect the securities'  market value, in  which
case these securities will be valued at their fair market value as determined by
the  Board of  Trustees. The value  of other  assets will be  determined in good
faith under procedures established by and under the supervision of the Trustees.
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
AUTOMATIC INVESTMENT OF DIVIDENDS AND  DISTRIBUTIONS.  All income dividends  and
capital gains distributions are automatically paid in full and fractional shares
of the Fund, (or, if specified by the shareholder, any other open-end investment
company  for which InterCapital serves as investment manager (collectively, with
the Fund, the  "Dean Witter Funds")),  unless the shareholder  requests they  be
paid  in  cash.  Shares so  acquired  are not  subject  to the  imposition  of a
contingent deferred sales  charge upon  their redemption  (see "Redemptions  and
Repurchases").  Such dividends and distributions will  be paid, at the net asset
value per  share, in  shares of  the  Fund (or  in cash  if the  shareholder  so
requests)  on the  monthly payment date,  which will  be no later  than the last
business day of  the month for  which the dividend  or distribution is  payable.
Processing  of dividend checks begins  immediately following the monthly payment
date. Shareholders who have requested to receive dividends in cash will normally
receive their monthly dividend check during the first ten days of the  following
month.
 
EASYINVEST-SM-.  Shareholders may subscribe to EasyInvest, an automatic purchase
plan  which  provides for  any  amount from  $100  to $5,000  to  be transferred
automatically from a checking or savings account, on a semi-monthly, monthly  or
quarterly basis, to the Transfer Agent for investment in shares of the Fund (see
"Purchase  of  Fund  Shares"  and  "Redemptions  and  Repurchase  -- Involuntary
Redemption").
 
INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS RECEIVED IN CASH.  Any shareholder who
receives a cash payment  representing a dividend  or capital gains  distribution
may  invest such dividend or distribution at  the net asset value per share next
determined after receipt by  the Transfer Agent, by  returning the check or  the
proceeds to the Transfer Agent within thirty days after the payment date. Shares
so  acquired are not  subject to the  imposition of a  contingent deferred sales
charge upon their redemption (see "Redemptions and Repurchases.")
 
SYSTEMATIC WITHDRAWAL  PLAN.   A  systematic  withdrawal plan  (the  "Withdrawal
Plan")  is available  for shareholders  who own or  purchase shares  of the Fund
having a minimum value of $10,000 based  upon the then current net asset  value.
The  Withdrawal Plan provides  for monthly or  quarterly (March, June, September
and December) checks in  any dollar amount,  not less than $25  or in any  whole
per-
 
                                                                              11
<PAGE>
centage  of  the  account  balances  on  an  annualized  basis.  Any  applicable
contingent deferred sales charge  will be imposed on  shares redeemed under  the
Withdrawal  Plan  (see "Redemptions  and Repurchases--Contingent  Deferred Sales
Charge"). Therefore, any shareholder participating  in the Withdrawal Plan  will
have  sufficient shares redeemed  from his or  her account so  that the proceeds
(net of any applicable contingent deferred sales charge) to the shareholder will
be the designated monthly or quarterly amount.
 
    Shareholders should  contact their  DWR  or Selected  Broker-Dealer  Account
Executive  or the Transfer Agent for further  information about any of the above
services.
 
EXCHANGE PRIVILEGE
 
The Fund makes available  to its shareholders  an "Exchange Privilege"  allowing
the  exchange of shares of  the Fund for shares of  other Dean Witter Funds sold
with a contingent deferred sales charge  ("CDSC funds"), and for shares of  Dean
Witter Short-Term U.S. Treasury Trust, Dean Witter Limited Term Municipal Trust,
Dean  Witter Short-Term Bond Fund, Dean Witter Balanced Growth Fund, Dean Witter
Balanced Income Fund, Dean Witter Intermediate Term U.S. Treasury Trust and  for
five  Dean  Witter Funds  which  are money  market  funds (the  foregoing eleven
non-CDSC or FESC funds are hereinafter collectively referred to in this  section
as  the "Exchange Funds").  Exchanges may be  made after the  shares of the Fund
acquired by purchase (not by exchange  or dividend reinvestment) have been  held
for  thirty days. There is no waiting period for exchanges of shares acquired by
exchange or dividend reinvestment.
 
    An exchange to another CDSC  fund or any Exchange Fund  that is not a  money
market  fund is on the basis of the next calculated net asset value per share of
each fund after  the exchange order  is received. When  exchanging into a  money
market  fund from the Fund, shares  of the Fund are redeemed  out of the Fund at
their next calculated  net asset value  and the proceeds  of the redemption  are
used  to  purchase shares  of the  money market  fund at  their net  asset value
determined the following business day.  Subsequent exchanges between any of  the
money  market funds and any of the CDSC funds can be effected on the same basis.
No contingent  deferred sales  charge ("CDSC")  is imposed  at the  time of  any
exchange, although any applicable CDSC will be imposed upon ultimate redemption.
Shares of the Fund acquired in exchange for shares of another CDSC fund having a
different  CDSC schedule  than that  of this  Fund will  be subject  to the CDSC
schedule of this  Fund, even if  such shares are  subsequently re-exchanged  for
shares  of the  CDSC fund  originally purchased. During  the period  of time the
shareholder remains in the Exchange Funds  (calculated from the last day of  the
month in which the shares were acquired), the holding period (for the purpose of
determining  the rate of the  CDSC) is frozen. If  those shares are subsequently
reexchanged for shares of a CDSC fund, the holding period previously frozen when
the first exchange was made resumes on the last day of the month in which shares
of the  CDSC  fund  are reacquired.  Thus,  the  CDSC is  based  upon  the  time
(calculated as described above) the shareholder was invested in a CDSC fund (see
"Redemptions  and Repurchases--Contingent  Deferred Sales  Charge"). However, in
the case of shares  of the Fund  exchanged into the Exchange  Funds on or  after
April  23,  1990, upon  a redemption  of shares  which results  in a  CDSC being
imposed, a credit (not  to exceed the amount  of the CDSC) will  be given in  an
amount  equal to the Exchange Funds 12b-1 distribution fees incurred on or after
that date  which  are  attributable  to those  shares.  (Exchange  Funds'  12b-1
distribution fees are described in the prospectus for those funds).
 
    In  addition, shares of the  Fund may be acquired  in exchange for shares of
Dean Witter Funds sold with a front-end sales charge ("FESC funds"), but  shares
of  the Fund, however acquired,  may not be exchanged  for shares of FESC funds.
Shares of a  CDSC fund acquired  in exchange for  shares of a  FESC Fund (or  in
exchange  for shares of other Dean Witter Funds  for which shares of a FESC fund
have been exchanged) are not subject to any CDSC upon their redemption.
 
    Purchases and  exchanges should  be  made for  investment purposes  only.  A
pattern  of frequent  exchanges may  be deemed by  the Investment  Manager to be
abusive and contrary to the best interests of the Fund's other shareholders and,
at the Investment Manager's discretion, may be limited by the Fund's refusal  to
accept  additional purchases  and/or exchanges  from the  investor. Although the
Fund does not  have any  specific definition of  what constitutes  a pattern  of
frequent  exchanges,  and  will  consider all  relevant  factors  in determining
whether a particular situation is abusive and contrary to the best interests  of
the Fund and its other shareholders, investors should be aware that the Fund and
each  of the other Dean Witter Funds  may in their discretion limit or otherwise
restrict the number  of times this  Exchange Privilege may  be exercised by  any
investor.  Any such restriction will be made  by the Fund on a prospective basis
only, upon notice  to the  shareholder not later  than ten  days following  such
shareholder's most recent exchange.
 
    Also, the Exchange Privilege may be terminated or revised at any time by the
Fund  and/or any of such Dean  Witter Funds for which shares  of the Fund may be
exchanged, upon  such  notice  as  may  be  required  by  applicable  regulatory
agencies.  Shareholders maintaining margin accounts with DWR or another Selected
Broker-Dealer are referred to their account executive regarding restrictions  on
exchange of shares of the Fund pledged in their margin account.
 
    The  current prospectus for each  fund describes its investment objective(s)
and policies, and shareholders  should obtain one and  read it carefully  before
investing.  Exchanges are subject to the  minimum investment requirement and any
other conditions imposed by each fund. An
 
12
<PAGE>
exchange will  be  treated  for  federal  income tax  purposes  the  same  as  a
repurchase  or  redemption of  shares on  which the  shareholder has  realized a
capital gain  or loss.  However, the  ability  to deduct  capital losses  on  an
exchange  may be  limited in  situations where  there is  an exchange  of shares
within ninety days  after the shares  are purchased. The  Exchange Privilege  is
only available in states where an exchange may legally be made.
 
    If DWR or another Selected Broker-Dealer is the current dealer of record and
its  account  numbers  are part  of  the account  information,  shareholders may
initiate an exchange of shares of the Fund for shares of any of the Dean  Witter
Funds  (for which the Exchange Privilege is available) pursuant to this Exchange
Privilege by  contacting  their  DWR or  other  Selected  Broker-Dealer  account
executive   (no  Exchange  Privilege  Authorization  Form  is  required).  Other
shareholders (and those shareholders who are clients of DWR or another  Selected
Broker-Dealer  but who wish to make exchanges directly by writing or telephoning
the Transfer Agent) must complete and forward to the Transfer Agent an  Exchange
Privilege  Authorization Form, copies of which may be obtained from the Transfer
Agent, to initiate an exchange. If the Authorization Form is used, exchanges may
be made  in  writing or  by  contacting the  Transfer  Agent at  (800)  869-NEWS
(toll-free). The Fund will employ reasonable procedures to confirm that exchange
instructions  communicated over the  telephone are genuine.  Such procedures may
include requiring various forms of personal identification such as name, mailing
address, social security  or other tax  identification number and  DWR or  other
Selected  Dealer account  number (if  any). Telephone  instructions may  also be
recorded. If such procedures are  not employed, the Fund  may be liable for  any
losses due to unauthorized or fraudulent instructions.
 
    Telephone exchange instructions will be accepted if received by the Transfer
Agent  between 9:00 a.m.  and 4:00 p.m. New  York time, on any  day the New York
Stock Exchange  is open.  Any shareholder  wishing to  make an  exchange who  is
unable  to reach the  Fund by telephone should  contact his or  her DWR or other
Selected Broker-Dealer  account executive,  if appropriate,  or make  a  written
exchange  request.  Shareholders  are  advised that  during  periods  of drastic
economic  or  market  changes,  it  is  possible  that  the  telephone  exchange
procedures  may be difficult to  implement, although this has  not been the case
with the Dean Witter Funds in the past.
 
    Additional information concerning the Exchange Privilege is available from a
DWR or other Selected Dealer account executive or the Transfer Agent.
 
REDEMPTIONS AND REPURCHASES
- --------------------------------------------------------------------------------
 
REDEMPTION.  Shares of the Fund can be redeemed for cash at any time at the  net
asset  value per share next determined; however, such redemption proceeds may be
reduced by the amount of any  applicable contingent deferred sales charges  (see
below).  If  shares  are  held  in  a  shareholder's  account  without  a  share
certificate, a written request  for redemption to the  Fund's Transfer Agent  at
P.O. Box 983, Jersey City, NJ 07303 is required. If certificates are held by the
shareholder(s),  the shares may  be redeemed by  surrendering the certificate(s)
with a  written request  of redemption,  along with  any additional  information
required by the Transfer Agent.
 
CONTINGENT  DEFERRED SALES CHARGE.   Shares of  the Fund which  are held for six
years or more after purchase (calculated from the last day of the month in which
the shares were purchased)  will not be subject  to any charge upon  redemption.
Shares  redeemed sooner than six years  after purchase will, however, be subject
to a charge upon redemption. This charge is called a "contingent deferred  sales
charge"  ("CDSC"), which  will be  a percentage of  the dollar  amount of shares
redeemed and will be assessed  on an amount equal to  the lesser of the  current
market  value  or  the cost  of  the shares  being  redeemed. The  size  of this
percentage will depend upon how long the shares have been held, and is set forth
in the table below:
 
<TABLE>
<CAPTION>
                                             CONTINGENT DEFERRED
               YEAR SINCE                       SALES CHARGE
                PURCHASE                     ON A PERCENTAGE OF
              PAYMENT MADE                     AMOUNT REDEEMED
- -----------------------------------------  -----------------------
<S>                                        <C>
First....................................               5.0%
Second...................................               4.0
Third....................................               3.0%
Fourth...................................               2.0%
Fifth....................................               2.0%
Sixth....................................               1.0%
Seventh and thereafter...................           None
</TABLE>
 
    A CDSC will not be imposed on:  (i) any amount which represents an  increase
in value of shares purchased within the six years preceding the redemption; (ii)
the current net asset value of shares purchased more than six years prior to the
redemption;  and (iii) the  current net asset value  of shares purchased through
reinvestment of dividends  or distributions and/or  shares acquired in  exchange
for  shares of Dean Witter Funds sold with  a front-end sales charge or of other
Dean Witter Funds acquired in exchange for such shares. Moreover, in determining
whether a CDSC is applicable it will  be assumed that amounts described in  (i),
(ii), and (iii) above (in that order) are redeemed first.
 
                                                                              13
<PAGE>
    In  addition, the CDSC, if otherwise applicable,  will be waived in the case
of:
 
    (1) redemptions of  shares held at  the time a  shareholder dies or  becomes
disabled,  only  if the  shares are:  (A) registered  either in  the name  of an
individual shareholder (not a  trust), or in the  names of such shareholder  and
his  or her spouse as joint tenants with right of survivorship; or (B) held in a
qualified corporate  or  self-employed retirement  plan,  Individual  Retirement
Account  ("IRA") or  Custodial Account under  Section 403(b)(7)  of the Internal
Revenue Code  ("403(b) Custodial  Account"), provided  in either  case that  the
redemption is requested within one year of the death or initial determination of
disability;
 
    (2)   redemptions  in   connection  with   the  following   retirement  plan
distributions: (A) lump-sum or other distributions from a qualified corporate or
self-employed retirement plan following  retirement (or, in the  case of a  "key
employee"  of  a "top  heavy" plan,  following  attainment of  age 59  1/2); (B)
distributions from an IRA  or 403(b) Custodial  Account following attainment  of
age 59 1/2; or (C) a tax-free return of an excess contribution to an IRA; and
 
    (3)  all redemptions of  shares held for  the benefit of  a participant in a
corporate or self-employed retirement plan qualified under Section 401(k) of the
Internal  Revenue  Code  which  offers  investment  companies  managed  by   the
Investment  Manager or  its subsidiary,  Dean Witter  Services Company  Inc., as
self-directed investment alternatives and for which Dean Witter Trust Company or
Dean Witter Trust FSB, each of which is an affiliate of the Investment  Manager,
serves  as Trustee ("Eligible 401(k) Plan"),  provided that either: (A) the plan
continues to  be  an Eligible  401(k)  Plan after  the  redemption; or  (B)  the
redemption  is in connection with the complete termination of the plan involving
the distribution of all plan assets to participants.
 
    With reference to (1) above, for the purpose of determining disability,  the
Distributor  utilizes the definition of disability contained in Section 72(m)(7)
of the  Internal Revenue  Code, which  relates  to the  inability to  engage  in
gainful  employment. With reference  to (2) above,  the term "distribution" does
not encompass a direct transfer of  IRA, 403(b) Custodial Account or  retirement
plan  assets to a  successor custodian or  trustee. All waivers  will be granted
only following receipt by the  Distributor of confirmation of the  shareholder's
entitlement.
 
REPURCHASE.   DWR or other Selected  Broker-Dealers are authorized to repurchase
shares, represented by a  share certificate which is  delivered to any of  their
offices.  Shares held in a shareholder's account without a share certificate may
also be repurchased by DWR or other Selected Broker-Dealers upon the  telephonic
request  of the shareholder.  The repurchase price  is the net  asset value next
computed (see "Purchase of Fund Shares") after such repurchase order is received
by DWR or other Selected Broker-Dealers are, reduced by any applicable CDSC.
 
    The CDSC, if any, will be the only fee imposed upon repurchase by either the
Fund, the Distributor or DWR. The offer by DWR or other Selected  Broker-Dealers
to  repurchase shares may  be suspended without  notice by them  at any time. In
that event, shareholders  may redeem  their shares through  the Fund's  Transfer
Agent as set forth above under "Redemption."
 
PAYMENT  FOR SHARES REDEEMED  OR REPURCHASED.  Payment  for shares presented for
repurchase or redemption will be made  by check within seven days after  receipt
by  the Transfer Agent of the certificate  and/or written request in good order.
Such payment may be postponed or the right of redemption suspended under unusual
circumstances, e.g., when  normal trading is  not taking place  on the New  York
Stock  Exchange. If the  shares to be  redeemed have recently  been purchased by
check, payment of the  redemption proceeds may be  delayed for the minimum  time
needed  to verify that the check used  for investment has been honored (not more
than fifteen days from the time of receipt of the check by the Transfer  Agent).
Shareholders   maintaining   margin  accounts   with   DWR  or   other  Selected
Broker-Dealers are referred to their account executive regarding restrictions on
redemption of shares of the Fund pledged in the margin account.
 
REINSTATEMENT PRIVILEGE.  A shareholder who  has had his or her shares  redeemed
or  repurchased and  has not  previously exercised  this reinstatement privilege
may, within  thirty  days  after  the date  of  the  redemption  or  repurchase,
reinstate any portion or all of the proceeds of such redemption or repurchase in
shares  of the Fund at the net asset value next determined after a reinstatement
request, together  with the  proceeds, is  received by  the Transfer  Agent  and
receive  a pro-rata credit for any CDSC  paid in connection with such redemption
or repurchase.
 
INVOLUNTARY REDEMPTION.  The Fund reserves  the right to redeem, on sixty  days'
notice  and at net asset value, the shares of any shareholder (other than shares
held in  an Individual  Retirement Account  or Custodial  Account under  Section
403(b)(7)  of the Internal Revenue Code) whose  shares have a value of less than
$100 as a result of redemptions or repurchases, or such lesser amount as may  be
fixed  by the  Board of Trustees  or, in the  case of an  account opened through
EasyInvest, if after twelve months the shareholder has invested less than $1,000
in the  account. However,  before the  Fund redeems  such shares  and sends  the
proceeds  to the shareholder, it  will notify the shareholder  that the value of
the shares is less than the applicable amount and allow him or her sixty days to
make an additional investment in an amount which will increase the value of  his
or  her account to at least the  applicable amount or more before the redemption
is processed. No CDSC will be imposed on any involuntary redemption.
 
14
<PAGE>
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
DIVIDENDS AND DISTRIBUTIONS.   The Fund declares  dividends from net  investment
income  on  each day  the  New York  Stock Exchange  is  open for  business (see
"Purchase of Fund Shares"). Such dividends are payable monthly. The Fund intends
to distribute substantially all of the Fund's net investment income on an annual
basis.
 
    The Fund will distribute at least once each year all net short-term  capital
gains,  if there are any. The Fund  may, however, determine either to distribute
or to retain  all or part  of any net  long-term capital gains  in any year  for
reinvestment.  All dividends  and capital  gains distributions  will be  paid in
additional Fund shares (without sales charge) and automatically credited to  the
shareholder's  account  without  issuance  of  a  share  certificate  unless the
shareholder requests in  writing that they  be paid in  cash. (See  "Shareholder
Services--Automatic Investment of Dividends and Distributions".) Taxable capital
gains  may be generated by transactions in options and futures contracts engaged
in by the Fund. Any dividends or  distributions declared in the last quarter  of
any  calendar  year which  are  paid in  the  following calendar  year  prior to
February 1,  will be  deemed received  by shareholders  of record  in the  prior
calendar year.
 
TAXES.   Because the  Fund currently intends to  distribute substantially all of
its net  investment income  and capital  gains to  shareholders and  intends  to
otherwise comply with all the provisions of Subchapter M of the Internal Revenue
Code  (the  "Code") to  qualify as  a  regulated investment  company, it  is not
expected that the Fund will be required to pay any federal income tax.
 
    The Fund intends to continue  to qualify to pay "exempt-interest  dividends"
to  its shareholders  by maintaining,  as of  the close  of each  quarter of its
taxable year,  at least  50% of  the value  of its  total assets  in  tax-exempt
securities.  If  the Fund  satisfies  such requirement,  distributions  from net
investment income  to  shareholders, whether  taken  in cash  or  reinvested  in
additional  shares, will be excludable from  gross income for federal income tax
purposes to  the extent  net investment  income is  represented by  interest  on
tax-exempt securities.
 
    Individual  shareholders  who  are New  York  residents will  not  incur any
federal, New  York  State  or  New  York  City  income  tax  on  the  amount  of
exempt-interest  dividends received  by them  from the  Fund which  represents a
distribution of income from New York tax-exempt securities whether taken in cash
or reinvested  in additional  shares.  Exempt-interest dividends  are  included,
however,  in determining  what portion,  if any,  of a  person's Social Security
benefits are subject to federal income tax.  Within sixty days after the end  of
its  taxable year, the Fund will mail to shareholders a statement indicating the
percentage of the dividend distributions for such taxable year which constitutes
exempt-interest dividends and the percentage, if any, that is taxable.
 
    The Code  may  subject interest  received  on certain  otherwise  tax-exempt
securities  to an alternative  minimum tax. This alternative  minimum tax may be
incurred due to interest received on "private activity bonds" (in general, bonds
that benefit  non-government  entities)  issued  after  August  7,  1986  which,
although  tax-exempt, are used for purposes other than those generally performed
by governmental units  (e.g., bonds  used for commercial  or housing  purposes).
Income  received on such bonds  is classified as a  "tax preference item", under
the alternative  minimum tax,  for both  individual and  corporate investors.  A
portion  of the Fund's investments may be made in such "private activity bonds,"
with the result that a portion of the exempt-interest dividends paid by the Fund
will be an  item of tax  preference to shareholders  subject to the  alternative
minimum  tax.  In  addition,  certain  corporations  which  are  subject  to the
alternative minimum  tax  may  have  to include  a  portion  of  exempt-interest
dividends  in calculating their alternative minimum taxable income in situations
where the "adjusted current earnings" of the corporation exceeds its alternative
minimum taxable income.
 
    Under the Revenue Reconciliation Act of 1993, all or a portion of the Fund's
gain from the sale or redemption of tax-exempt obligations purchased at a market
discount after April  30, 1993 will  be treated as  ordinary income rather  than
capital  gain. This  rule may increase  the amount of  ordinary income dividends
received by shareholders.
 
    Shareholders will normally be subject to federal, New York State or New York
City income tax  on dividends  paid from  interest income  derived from  taxable
securities  and on distributions of net capital  gains. For federal and New York
State or  New York  City income  tax purposes,  distributions of  net  long-term
capital  gains, if any, are taxable  to shareholders as long-term capital gains,
regardless of how long the shareholder  has held the Fund shares and  regardless
of  whether  the  distribution is  received  in  additional shares  or  in cash.
Distributions   from   investment   income   and   capital   gains,    including
exempt-interest  dividends,  may  be  subject to  New  York  franchise  taxes if
received by a corporation doing business in  New York, to state taxes in  states
other  than New York and to local taxes.  To avoid being subject to a 31% backup
withholding tax on  taxable dividends  and capital gains  distributions and  the
proceeds  of redemptions and  repurchases, shareholders' taxpayer identification
numbers must be furnished and certified as to accuracy.
 
    The Fund may at times  make payments from sources  other than income or  net
capital gains. Payments from such sources will, in effect, represent a return of
a  portion of each shareholder's investment. All, or a portion, of such payments
will not be taxable to shareholders.
 
    Any loss on the sale  or exchange of shares of  the Fund which are held  for
six  months  or  less  is  disallowed  to  the  extent  of  the  amount  of  any
exempt-interest dividend paid with respect to such shares. Treasury  Regulations
may
 
                                                                              15
<PAGE>
provide  for  a reduction  in such  required holding  periods. If  a shareholder
receives a distribution that is taxed as a long-term capital gain on shares held
for six moths or less and sells those shares at a loss, the loss will be treated
as a long-term capital loss.
 
    Interest on  indebtedness incurred  by shareholders  or related  parties  to
purchase  or  carry  shares  of  an  investment  company  paying exempt-interest
dividends, such as the Fund, will not be deductible by the investor for  federal
or state or city personal income tax purposes.
 
    The  foregoing relates to federal income taxation  and to New York State and
New York City  personal income  taxation as  in effect as  of the  date of  this
prospectus.   Shareholders  should  consult   their  tax  advisers   as  to  the
applicability of the above to their own tax situation.
 
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
From time to time the  Fund may quote its "yield"  and/or its "total return"  in
advertisements  and sales literature. Both the yield and the total return of the
Fund are based on  historical earnings and are  not intended to indicate  future
performance.  The yield of the Fund will  be computed by dividing the Fund's net
investment income over a  30-day period by an  average value (using the  average
number of shares entitled to receive dividends and the net asset value per share
at  the  end  of  the  period), all  in  accordance  with  applicable regulatory
requirements. Such amount is compounded for six months and then annualized for a
twelve-month period to  derive the  Fund's yield. The  Fund may  also quote  its
tax-equivalent  yield,  which is  calculated  by determining  the  pre-tax yield
which, after being  taxed at a  stated rate,  would be equivalent  to the  yield
determined as described above.
 
    The  "average annual total return" of the Fund refers to a figure reflecting
the average annualized  percentage increase  (or decrease)  in the  value of  an
initial  investment in the Fund of $1,000 over  a period of one, five, ten years
or over the life of  the Fund. Average annual  total return reflects all  income
earned  by the Fund, any appreciation or  depreciation of the Fund's assets, all
expenses incurred by the Fund and all  sales charges which would be incurred  by
redeeming  shareholders, for the stated periods. It also assumes reinvestment of
all dividends and distributions paid by the Fund.
 
    In addition to the foregoing, the  Fund may advertise its total return  over
different  periods of time by means of aggregate, average, year-by-year or other
types of total  return figures.  Such calculations may  or may  not reflect  the
deduction  of the  contingent deferred sales  charge which,  if reflected, would
reduce the  performance  quoted. The  Fund  may  also advertise  the  growth  of
hypothetical investments of $10,000, $50,000 and $100,000 in shares of the Fund.
The  Fund  from time  to time  may  also advertise  its performance  relative to
certain performance rankings and  indexes compiled by independent  organizations
(such as mutual fund performance rankings of Lipper Analytical Services, Inc.).
 
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
VOTING  RIGHTS.  All shares of beneficial interest  of the Fund are of $0.01 par
value and are equal as to earnings, assets and voting privileges.
 
    The Fund is not required to hold Annual Meetings of Shareholders and,  under
ordinary  circumstances, the  Fund does  not intend  to hold  such meetings. The
Trustees may call  Special Meetings  of Shareholders for  action by  shareholder
vote  as may be required  by the Act or the  Declaration of Trust. Under certain
circumstances the Trustees may be  removed by action of  the Trustees or by  the
Shareholders.
 
    Under Massachusetts law, shareholders of a business trust may, under certain
circumstances,  be held personally liable as partners for the obligations of the
Fund. However,  the  Declaration of  Trust  contains an  express  disclaimer  of
shareholder  liability for acts  or obligations of the  Fund, requires that Fund
obligations  include  such  disclaimer  and  provides  for  indemnification  and
reimbursement  of expenses out  of the Fund's property  for any shareholder held
personally liable  for  the  obligations  of  the Fund.  Thus,  the  risk  of  a
shareholder  incurring  financial loss  on account  of shareholder  liability is
limited to circumstances in which  the Fund itself would  be unable to meet  its
obligations.  Given the above limitations  on shareholder personal liability and
the nature of the  Fund's assets and operations,  the possibility of the  Fund's
being  unable  to  meet  its  obligations  is  remote  and,  in  the  opinion of
Massachusetts counsel to  the Fund, the  risk to Fund  shareholders of  personal
liability is remote.
 
CODE  OF ETHICS.  Directors, officers and employees of InterCapital, Dean Witter
Services Company Inc. and the Distributor are subject to a strict Code of Ethics
adopted by those companies. The  Code of Ethics is  intended to ensure that  the
interests  of shareholders  and other clients  are placed ahead  of any personal
interest, that no undue personal benefit is obtained from a person's  employment
activities  and that actual and potential  conflicts of interest are avoided. To
achieve these goals and comply with regulatory requirements, the Code of  Ethics
requires, among other things, that personal securities transactions by employees
 
16
<PAGE>
of  the companies be subject to an  advance clearance process to monitor that no
Dean Witter Fund is engaged at the same  time in a purchase or sale of the  same
security.  The Code  of Ethics  bans the  purchase of  securities in  an initial
public offering and prohibits engaging  in futures and options transactions  and
profiting on short-term trading (that is, a purchase within sixty days of a sale
or  a  sale  within  sixty days  of  a  purchase) of  a  security.  In addition,
investment personnel may  not purchase  or sell  a security  for their  personal
account  within thirty days before  or after any transaction  in any Dean Witter
Fund managed  by them.  Any violations  of the  Code of  Ethics are  subject  to
sanctions,  including  reprimand,  demotion  or  suspension  or  termination  of
employment. The Code  of Ethics  comports with regulatory  requirements and  the
recommendations  in the 1994 report by the Investment Company Institute Advisory
Group on Personal Investing.
 
SHAREHOLDER INQUIRIES.  All inquiries regarding  the Fund should be directed  to
the  Fund at the  telephone numbers or address  set forth on  the front cover of
this prospectus.
 
                                                                              17
<PAGE>
 
DEAN WITTER
NEW YORK TAX-FREE INCOME FUND
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
 
TRUSTEES
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Dr. Manuel H. Johnson
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
 
OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive
Officer
Barry Fink
Vice President, Secretary and
General Counsel
James F. Willison
Vice President
Joseph R. Arcieri
Vice President
Thomas F. Caloia
Treasurer
 
CUSTODIAN
The Bank of New York
90 Washington Street
New York, New York 10286
 
TRANSFER AGENT AND
DIVIDEND DISBURSING AGENT
Dean Witter Trust Company
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311
 
INDEPENDENT ACCOUNTANTS
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036
 
INVESTMENT MANAGER
Dean Witter InterCapital Inc.
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