DEAN WITTER CALIFORNIA TAX FREE INCOME FUND
497, 1997-03-19
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<PAGE>
                        DEAN WITTER
                        CALIFORNIA TAX-FREE INCOME FUND
                        PROSPECTUS--MARCH 13, 1997
 
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DEAN WITTER CALIFORNIA 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 BOTH FEDERAL AND CALIFORNIA
INCOME TAX, CONSISTENT WITH THE PRESERVATION OF CAPITAL. THE FUND INVESTS
PRINCIPALLY IN CALIFORNIA 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. 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 Rule 12b-1 distribution fee pursuant to a Plan of Distribution 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 "Purchase 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...........................      10
 
Purchase of Fund Shares...........................      10
 
Shareholder Services..............................      11
 
Redemptions and Repurchases.......................      13
 
Dividends, Distributions and Taxes................      15
 
Performance Information...........................      16
 
Additional Information............................      17
</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
CALIFORNIA 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 California 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 17).
- -------------------------------------------------------------------------------------------------------
 
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 is $1,000 ($100 if the account is opened through EasyInvestSM); minimum
PURCHASE          subsequent investment is $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 both
OBJECTIVE         federal and California income tax, consistent with preservation of capital.
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INVESTMENT        The Fund will invest principally in California tax-exempt fixed-income securities. However, it may
POLICIES          also invest in taxable money market instruments, non-California 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).
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MANAGEMENT        The Investment Manager receives a monthly fee at the annual rate of 0.55% of average 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 page 11).
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REDEMPTION--      Shares are redeemable by the shareholder at net asset value; an account may be involuntarily
CONTINGENT        redeemed if the total value of the account is less than $100 or, if the account was opened through
DEFERRED          EasyInvest-SM-, if after twelve months the shareholder has invested less than $1,000 in the
SALES CHARGE      account. Although no commission or sales charge is imposed upon the purchase of shares, a
                  contingent deferred sales charge (scaled down from 5% to 1%) is imposed on any redemption of
                  shares if, after 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 13-15).
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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 which 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 California tax-exempt securities, the Fund is affected by any political,
                  economic or regulatory developments affecting the ability of California issuers to pay interest or
                  repay principal.
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</TABLE>
 
  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
                          ELSEWHERE IN THE PROSPECTUS
                AND IN THE STATEMENT OF ADDITIONAL INFORMATION.
 
2
<PAGE>
SUMMARY OF FUND EXPENSES
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The following table illustrates all expenses and fees 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....................................  0.53%
12b-1 Fees*.......................................  0.75%
Other Expenses....................................  0.04%
Total Fund Operating Expenses.....................  1.32%
<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 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........    $63       $72       $92       $159
You would pay the following expenses on the same
 investment, assuming no redemption...............    $13       $42       $72       $159
</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 "Redemptions 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
charges 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 to 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..............  $12.92    $11.87   $13.31   $12.70   $12.46   $11.99   $12.05    $11.68    $11.19    $12.25
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
  Net investment
   income.............   0.58      0.61     0.64     0.67     0.69     0.71      0.72      0.71      0.72      0.72
  Net realized and
   unrealized gain
   (loss).............  (0.21)     1.13    (1.42)    0.70     0.26     0.48     (0.06)     0.37      0.50     (1.06)
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
  Total from
   investment
   operations.........   0.37      1.74    (0.78)    1.37     0.95     1.19      0.66      1.08      1.22     (0.34)
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
  Less dividends and
   distributions from:
    Net investment
     income...........  (0.58)    (0.61)   (0.64)   (0.67)   (0.69)   (0.71)    (0.72)    (0.71)    (0.72)    (0.72)
    Net realized
     gain.............  (0.14)    (0.08)   (0.02)   (0.09)   (0.02)   (0.01)     --        --       (0.01)     --
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
  Total dividends and
   distributions......  (0.72)    (0.69)   (0.66)   (0.76)   (0.71)   (0.72)    (0.72)    (0.71)    (0.73)    (0.72)
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
  Net asset value,
   end of period......  $12.57    $12.92   $11.87   $13.31   $12.70   $12.46   $11.99    $12.05    $11.68    $11.19
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
                        -------   ------   ------   ------   ------   ------   -------   -------   -------   --------
TOTAL INVESTMENT
  RETURN+.............   3.13%    14.96%   (5.97)%  10.97%    7.83%   10.18%     5.69%     9.54%    11.23%    (2.70)%
  Ratios to Average
   Net Assets:
    Expenses..........   1.32%(1)  1.33%    1.32%    1.27%    1.32%    1.28%     1.30%     1.32%     1.34%     1.35%
    Net investment
     income...........   4.66%     4.90%    5.10%    5.03%    5.45%    5.78%     5.98%     6.00%     6.31%     6.27%
SUPPLEMENTAL DATA:
  Net assets, end of
   period, in
   millions...........   $976     $1,055   $1,008   $1,190    $987     $834      $677      $567      $430      $365
  Portfolio turnover
   rate...............     11%       23%      12%      10%       6%       3%       16%       13%       13%       23%
</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 RATIO DOES NOT REFLECT THE EFFECT OF EXPENSE OFFSETS OF 0.01%.
 
4
<PAGE>
THE FUND AND ITS MANAGEMENT
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Dean Witter California 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 April 9, 1984.
 
    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 Dean Witter
InterCapital and Dean Witter Distributors Inc., the Fund's distributor. It is
currently anticipated that the transaction will close in mid-1997. Thereafter,
Dean Witter InterCapital Inc. 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
Trustees review 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 at an annual rate
of 0.55% of the portion of the daily net assets of the Fund not exceeding $500
million, scaled down at various asset levels to 0.475% on the portion of the
Fund's assets exceeding $1 billion. For the fiscal year ended December 31, 1996,
the Fund accrued total compensation to the Investment Manager amounting to 0.53%
of the Fund's average daily net assets and the Fund's total expenses amounted to
1.32% 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 both federal and California 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 California tax-exempt securities, except as stated in
paragraph (3) below. California tax-exempt securities consist of California
Municipal Bonds and California Municipal Notes ("California Municipal
Obligations") and California Municipal Commercial Paper. Only California
tax-exempt securities which satisfy the following standards may be purchased by
the Fund: (a) California 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) California 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 California
Municipal Bonds rated as set forth in clause (a) of this paragraph; (c)
California 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.
 
    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 minimum 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.
 
                                                                               5
<PAGE>
    3.  Up to 20% of the Fund's total assets may be invested in taxable money
market instruments, non-California 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 and
non-California tax exempt securities, or in tax-exempt securities subject to the
federal alternative minimum tax for individual shareholders, 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-California
tax-exempt securities which satisfy the standards set forth in paragraph (1) for
California 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 by
Moody's or A-1 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 are short-term obligations of
municipalities. Any Municipal Bond or Municipal Note 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 California Municipal Obligation or California Municipal
Commercial Paper only if, in the opinion of bond counsel, the interest payable
thereon is exempt from both federal income tax and California personal income
tax. The Fund may 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 foregoing percentage and rating policies apply at the time of
acquisition of a security based upon the last previous determination of the
Fund's net asset value. Any subsequent change in any rating or change in
percentages resulting from market fluctuations or other changes in the Fund's
total assets will not require elimination of any security from the Fund's
portfolio until such time as the value of all such securities exceeds 5% of the
Fund's total assets and, at such time, only when the Investment Manager
determines that it is practicable to sell the security without undue market or
tax consequences to the Fund. As such, the Fund may hold Municipal Bonds rated
below investment grade by Moody's and/or S&P in its portfolio. Municipal Bonds
rated below investment grade may not currently be paying any interest and may
have extremely poor prospects of ever attaining any real investment standing.
 
    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 BBB by S&P or Baa by Moody's
(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 bonds 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
 
6
<PAGE>
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
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 Fund does not generally intend to invest more than 25% of its total
assets in securities of any one governmental unit. The Fund may invest more than
25% of its total assets in industrial development and pollution control bonds
(two kinds of tax-exempt Municipal Bonds) whether or not the users of facilities
financed by such bonds are in the same industry. In cases where such users are
in the same industry, there may be additional risk to the Fund in the event of
an economic downturn in such industry, which may result generally in a lowered
need for such facilities and a lowered ability of such users to pay for the use
of such facilities.
 
    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. 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
 
                                                                               7
<PAGE>
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 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 futures contracts to protect against the price
volatility of portfolio securities is that the prices of securities subject to
such 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 the financial futures contracts in which the
Fund may invest are on taxable securities rather than 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 its
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 and options thereon 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 a
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.
 
RISK CONSIDERATIONS RELATING TO CALIFORNIA TAX-EXEMPT SECURITIES
 
The Fund will be affected by any political, economic or regulatory developments
affecting the ability of California issuers to pay interest or repay principal
on their obligations. Various subsequent developments regarding the California
Constitution and State of California ("State") statutes which limit the taxing
and spending authority of California governmental entities may impair the
ability of California issuers to maintain debt service on their obligations. Of
particular impact are constitutional voter initiatives, which have become common
in recent years. The following information constitutes only a brief summary and
is not intended as a complete description.
 
    California is the most populous state in the nation with a total population
at the 1990 census of 29,976,000. Growth has been incessant since World War II,
with population gains in each decade since 1950 of between 18% and 49%. During
the last decade, the population rose 20%. The State now comprises 12.3% of the
nation's population and 12.9% of its total personal income. Its economy is broad
and
diver-
 
<PAGE>
sified with major concentrations in high technology research and manufacturing,
aerospace and defense-related manufacturing, trade, real estate, and financial
services. After experiencing strong growth throughout much of the 1980s, the
State was adversely affected by both the national recession and the cutbacks in
aerospace and defense spending which had a severe impact on the economy in
Southern California. Although California is still experiencing some of the
effects of the recession and its unemployment is above the national average, the
gap is narrowing and is projected to close to within 1% of the national average
in 1997. California's economic recovery from the recession is continuing at a
strong pace. Recent economic reports indicate that, while the rate of economic
growth in California is expected to moderate over the next three years, the
increases in employment and income will likely exceed those of the nation as a
whole by a significant margin.
 
    These economic difficulties have exacerbated the structural budget imbalance
which has been evident since fiscal year 1985-1986. Since that time, budget
shortfalls have become increasingly more difficult to solve and the State has
recorded in its general fund (the "General Fund") operating deficits in several
fiscal years. Many of these problems have been attributable to the fact that the
great population influx has produced increased demand for education and social
services at a far greater pace than the growth in the State's tax revenues.
Despite substantial tax increases, expenditure reductions and the shift of some
expenditure responsibilities to local government, the budget condition remains
problematic.
 
    In July 1996, the Governor signed into law a new $62.8 billion budget which,
among other things, significantly increases education spending from the previous
fiscal year, reduces taxes for corporations and banks and provides for a
balanced budget at the close of the fiscal year. At the same time, the budget
continues several funding reductions made in past years, mostly to health and
welfare programs. Although the state's budget provides for a reserve of $305
million, revenue and expenditure developments have occurred which may have the
effect of reducing the reserve. The Governor's proposed budget for fiscal year
1997-1998 indicates total spending of $66.6 billion and anticipates a $553
million reserve for economic uncertainties. As in past years, the state's budget
assumes savings which depend on future federal actions, both to fund programs
relating to MediCal and incarceration costs associated with undocumented
immigrants and to relieve the state from federally mandated spending, which may
not occur. Accordingly, the anticipated reserves may be reduced unless the
economy outperforms expectations or spending falls below planned levels.
 
    Because of California's continuing budget problems, the State's General
Obligation bonds were downgraded in July 1994 from A1 to Aa by Moody's and from
A+ to A by Standard & Poor's and from AA to A by Fitch Investment Service, Inc.
All three ratings companies expressed uncertainty in the State's ability to
balance its budget by 1996. However, in 1996, citing California's improving
economy and budget situation, both Fitch and Standard & Poor's raised their
ratings from A to A+.
 
    The effect of these various constitutional and statutory amendments and
budget developments upon the ability of California issuers to pay interest and
principal on their obligations remains unclear and in any event may depend upon
whether a particular California tax-exempt security is a general or limited
obligation bond and on the type of security provided for the bond. It is
possible that other measures affecting the taxing or spending authority of
California or its political subdivisions may be approved or enacted in the
future.
 
    For a more detailed discussion of the State of California economic factors,
see the Statement of Additional Information.
 
PORTFOLIO MANAGEMENT
 
The Fund is managed by the Investment Manager with a view to achieving the
Fund's 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 31,
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 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.
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.
 
                                                                               9
<PAGE>
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
    were 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 California 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 taxable
    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 by the State of California 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).
 
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
The Fund offers its shares for sale to the public on a continuous basis.
Pursuant to a Distribution Agreement between the Fund and Dean Witter
Distributors Inc. (the "Distributor"), an affiliate of the Investment Manager,
shares of the Fund are distributed by 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 California 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 other Selected
Dealer account executive. The minimum initial purchase in the case of
investments through EasyInvestSM, 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. 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). 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 where 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. 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,
California 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, California 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, California Series, should call
the telephone numbers listed on the front cover of this Prospectus, or may call
their account executive for additional information.
 
10
<PAGE>
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 account executives and other employees of DWR,
its affiliates and other Selected Broker-Dealers 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 $7,504,744, 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 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 the excess distribution expenses, including the carrying
charge described above, totalled $3,649,503 at December 31, 1996, which was
equal to 0.37% 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 by the Distributor in
excess of payments made to the Distributor 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 (or, on days when the New York Stock Exchange closes prior to 4:00
p.m., at such earlier time) on each day that the New York Stock Exchange is open
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 Board of Trustees.
The pricing 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 of Trustees 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 Board of 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
 
                                                                              11
<PAGE>
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 Repurchases -- 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
percentage of the account balance, 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 other 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,
and 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 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 Exchange Funds 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 a 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. (The Exchange Funds'
12b-1 distribution fees are described in the prospectus for these 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
 
12
<PAGE>
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 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 account executive (no Exchange Privilege
Authorization Form is required). Other shareholders (and those shareholders who
are clients of DWR or other Selected Broker-Dealers 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 has
previously filed an Exchange Privilege Authorization Form and 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 Broker-Dealer account executives 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, New Jersey 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
 
                                                                              13
<PAGE>
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, as 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.
 
    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 41(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 and 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, reduced by any applicable CDSC.
 
    The CDSC, if any, will be the only fee imposed upon repurchase by 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. 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 their 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
 
14
<PAGE>
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 due to redemptions by the shareholder have a value of less than $100 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.
 
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 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 all dividends 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 year prior to
February 1, will be deemed received by shareholders of record in the prior
calendar year.
 
TAXES.  Because the Fund 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 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, then distributions from net investment
income to shareholders will be exempt from federal taxation to the extent net
investment income is represented by interest on tax-exempt securities.
Shareholders generally will not incur any federal income tax on the amount of
exempt-interest dividends received by them from the Fund, 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.
 
    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 California law, a fund which qualifies as a regulated investment
company must have at least 50% of its total assets invested in California state
and local issues (or in obligations of the United States which pay interest
excludable from income) at the end of each quarter of its taxable year in order
to be eligible to pay dividends which will be exempt from California personal
income tax. Shareholders who are California residents will not incur any federal
or California income tax on the amount of exempt-interest dividends received by
them from the Fund and derived from California state and local issues, whether
taken in cash or reinvested in additional shares.
 
    After the end of the calendar year, the shareholders will be sent a
statement indicating the percentage of the
 
                                                                              15
<PAGE>
dividend distributions for such fiscal year which constitutes exempt-interest
dividends and the percentage, if any, that is taxable, and the percentage, if
any, of the exempt-interest dividends which constitutes an item of tax
preference. Unlike federal law, California law provides that no portion of the
exempt-interest dividends will constitute an item of tax preference for
California personal income tax purposes. Moreover, unlike federal law, an
individual's Social Security benefits are not subject to California personal
income tax, so that the receipt of California exempt-interest dividends will
have no effect on an individual's California personal income tax.
 
    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 and California personal
income tax on dividends paid from interest income derived from taxable
securities and on distributions of net capital gains. For federal income tax and
California personal income tax purposes, distributions of long-term capital
gains, if any, are taxable to shareholders as long-term capital gains,
regardless of how long a shareholder has held the Fund's shares and regardless
of whether the distribution is received in additional shares or in cash. In
addition, unlike federal law, the shareholders of the Fund will not be subject
to tax, or receive a credit for tax paid by the Fund, on undistributed capital
gains, if any. 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 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 months 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 personal income tax purposes.
 
    The foregoing relates to federal income taxation and to California personal
income taxation as in effect as of the date of this Prospectus. Distributions
from investment income and capital gains, including exempt-interest dividends,
may be subject to California franchise taxes if received by a corporation doing
business in California, to state taxes in states other than California and to
local taxes.
 
    Shareholders should consult their tax adviser 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 is 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.)
 
16
<PAGE>
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
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
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
CALIFORNIA 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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