WITTER DEAN TAX EXEMPT SECURITIES TRUST
497, 1997-04-07
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<PAGE>
                                                Filed Pursuant to Rule 497(e)
                                                Registration File No.: 2-66268

DEAN WITTER 
TAX-EXEMPT SECURITIES TRUST 
PROSPECTUS -- MARCH 26, 1997 
- ------------------------------------------------------------------------------ 

DEAN WITTER TAX-EXEMPT SECURITIES TRUST (THE "FUND") IS AN OPEN-END, 
DIVERSIFIED MANAGEMENT INVESTMENT COMPANY, WHOSE INVESTMENT OBJECTIVE IS TO 
PROVIDE A HIGH LEVEL OF CURRENT INCOME EXEMPT FROM FEDERAL INCOME TAX, 
CONSISTENT WITH THE PRESERVATION OF CAPITAL. THE FUND INVESTS PRINCIPALLY IN 
TAX-EXEMPT FIXED-INCOME SECURITIES WHICH ARE RATED IN THE THREE HIGHEST 
CATEGORIES BY MOODY'S INVESTORS SERVICE, INC. OR STANDARD & POOR'S 
CORPORATION. (SEE "INVESTMENT OBJECTIVE AND POLICIES.") 

   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 26, 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 OF CONTENTS 

Prospectus Summary ....................................................      2 

Summary of Fund Expenses ..............................................      3 

Financial Highlights ..................................................      3 

The Fund and its Management ...........................................      4 

Investment Objective and Policies .....................................      4 

 Risk Considerations and Investment Practices .........................      6 

Investment Restrictions ...............................................      8 

Purchase of Fund Shares ...............................................      9 

Shareholder Services ..................................................     11 

Redemptions and Repurchases ...........................................     13 

Dividends, Distributions and Taxes ....................................     13 

Performance Information ...............................................     14 

Additional Information ................................................     15 

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 
TAX-EXEMPT SECURITIES TRUST 
TWO WORLD TRADE CENTER 
NEW YORK, NEW YORK 10048 
(212) 392-2550 OR 
(800) 869-NEWS (TOLL-FREE) 

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

<TABLE>
<CAPTION>
<S>                 <C>
 The                The Fund is organized as a Trust, commonly known as a Massachusetts business 
Fund                trust, and is an open-end, diversified management investment company 
                    investing principally in investment grade, tax-exempt fixed-income securities 
                    (see page 4). 
- ------------------  ----------------------------------------------------------------------------- 
Shares Offered      Shares of beneficial interest with $0.01 par value (see page 15). 
- ------------------  ----------------------------------------------------------------------------- 
Offering            The price of the shares offered by this prospectus varies with the changes in 
Price               the value of the Fund's investments. The offering price, determined once 
                    daily as of 4:00 p.m., New York time, on each day that the New York Stock 
                    Exchange is open, is equal to the net asset value plus a sales charge of 4.0% 
                    of the offering price, scaled down on purchases of $25,000 or over (see pages 
                    9-10). 
- ------------------  ----------------------------------------------------------------------------- 
Minimum             Minimum initial purchase is $1,000; ($100 if the account is opened through 
Purchase            EasyInvest (Service Mark) ); minimum subsequent purchase is $100 (see page 
                    9). 
- ------------------  ----------------------------------------------------------------------------- 
Investment          The investment objective of the Fund is to provide a high level of current 
Objective           income exempt from federal income tax, consistent with the preservation of 
                    capital (see page 4). 
- ------------------  ----------------------------------------------------------------------------- 
Investment          Dean Witter InterCapital Inc. ("InterCapital"), the Investment Manager of the 
Manager             Fund, and its wholly-owned 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 4). 
- ------------------  ----------------------------------------------------------------------------- 
Management          The monthly fee is at an annual rate of 1/2 of 1% of average daily net 
Fee                 assets, scaled down on assets over $500 million (see page 4). 
- ------------------  ----------------------------------------------------------------------------- 
Dividends and       Income dividends are declared daily and paid monthly; capital gains, if any, 
Capital Gains       may be distributed annually or retained for reinvestment by the Fund. 
Distributions       Dividends and distributions are automatically reinvested in additional shares 
                    at net asset value (without sales charge), unless the shareholder elects to 
                    receive cash (see pages 13-14). 
- ------------------  ----------------------------------------------------------------------------- 
Distributor         Dean Witter Distributors Inc. (see page 9). 
- ------------------  ----------------------------------------------------------------------------- 
Sales Charge        4.0% of offering price (4.17% of amount invested); reduced charges on 
                    purchases of $25,000 or more (see pages 9-10). 
- ------------------  ----------------------------------------------------------------------------- 
Redemption          Shares redeemable by the shareholder at net asset value. An account may be 
                    involuntarily redeemed if shares owned have a net asset value of less than 
                    $100 or, if the account was opened through EasyInvest (Service Mark), if 
                    after twelve months the shareholder has invested less than $1,000 in the 
                    account. (see pages 13). 
- ------------------  ----------------------------------------------------------------------------- 
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 may purchase when-issued and delayed delivery 
                    securities (see page 6). The Fund may also invest in futures and options, 
                    which may be considered speculative in nature and which may involve greater 
                    risks than those customarily assumed by certain other investment companies 
                    which do not invest in such instruments (see page 7). 
- ------------------  ----------------------------------------------------------------------------- 
</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 
- ----------------------------------------------------------------------------- 

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>
<S>                                                                             <C>
SHAREHOLDER TRANSACTION EXPENSES 
Maximum Sales Charge Imposed on Purchases 
  (as a percentage of offering price).....................................       4.0% 
Maximum Sales Charge Imposed on Reinvested Dividends......................       None 
Deferred Sales............................................................       None 
Redemption Fees...........................................................       None 
Exchange Fee..............................................................       None 
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS) 
Management Fee............................................................      0.43% 
Other Expenses............................................................      0.05% 
Total Fund Operating Expenses.............................................      0.48% 
</TABLE>

<TABLE>
<CAPTION>
 EXAMPLE                                                         1 YEAR    3 YEARS    5 YEARS    10 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:.........................................    $45        $55        $66        $98 
</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" and "Purchase of Fund Shares." There are 
reduced sales charges on purchases of $25,000 or more (see "Purchase of Fund 
Shares"). 

FINANCIAL HIGHLIGHTS 
- ----------------------------------------------------------------------------- 

   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, the 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 
                               --------  --------  ---------  --------  -------- 
<S>                            <C>       <C>       <C>        <C>       <C>
PER SHARE OPERATING 
 PERFORMANCE: 
Net asset value, beginning of 
 period ......................   $12.09    $11.01    $12.41     $11.88    $11.65 
                               --------  --------  ---------  --------  -------- 
Net investment income ........     0.65      0.67      0.70       0.77      0.79 
Net realized and unrealized 
 gain (loss) .................    (0.24)     1.19     (1.37)      0.54      0.23 
                               --------  --------  ---------  --------  -------- 
Total from investment 
 operations ..................     0.41      1.86     (0.67)      1.31      1.02 
                               --------  --------  ---------  --------  -------- 
Less dividends and 
 distributions from: 
 Net investment income .......    (0.65)    (0.67)    (0.70)     (0.77)    (0.79) 
 Net realized gain ...........    (0.08)    (0.11)    (0.03)     (0.01)     -- 
                               --------  --------  ---------  --------  -------- 
Total dividends and 
 distributions ...............    (0.73)    (0.78)    (0.73)     (0.78)    (0.79) 
                               --------  --------  ---------  --------  -------- 
Net asset value, end of 
 period ......................   $11.77    $12.09    $11.01     $12.41    $11.88 
                               ========  ========  =========  ========  ======== 
TOTAL INVESTMENT RETURN+  ....     3.61%    17.37%    (5.55)%    11.23%     9.09% 
RATIOS TO AVERAGE NET ASSETS: 
Expenses .....................     0.48%     0.48%     0.47%      0.47%     0.49% 
Net investment income.........     5.52%     5.76%     6.02%      6.23%     6.74% 
SUPPLEMENTAL DATA: 
Net assets, end of period, 
 in millions .................   $1,190    $1,325    $1,295     $1,582    $1,323 
Portfolio turnover rate  .....       18%       21%       16%        13%        4% 
</TABLE>

<PAGE>
                    (RESTUBBED TABLE CONTINUED FROM ABOVE) 

<TABLE>
<CAPTION>
                                  1991      1990      1989      1988      1987 
                               --------  --------  --------  --------  --------- 
<S>                            <C>       <C>       <C>       <C>       <C>
PER SHARE OPERATING 
 PERFORMANCE: 
Net asset value, beginning of 
 period ......................   $11.09    $11.28    $10.96    $10.45    $11.50 
                               --------  --------  --------  --------  --------- 
Net investment income ........     0.80      0.80      0.81      0.81      0.80 
Net realized and unrealized 
 gain (loss) .................     0.56     (0.18)     0.32      0.51     (0.97) 
                               --------  --------  --------  --------  --------- 
Total from investment 
 operations ..................     1.36      0.62      1.13      1.32     (0.17) 
                               --------  --------  --------  --------  --------- 
Less dividends and 
 distributions from: 
 Net investment income .......    (0.80)    (0.81)    (0.81)    (0.81)    (0.83) 
 Net realized gain ...........     --        --        --        --       (0.05) 
                               --------  --------  --------  --------  --------- 
Total dividends and 
 distributions ...............    (0.80)    (0.81)    (0.81)    (0.81)    (0.88) 
                               --------  --------  --------  --------  --------- 
Net asset value, end of 
 period ......................   $11.65    $11.09    $11.28    $10.96    $10.45 
                               ========  ========  ========  ========  ========= 
TOTAL INVESTMENT RETURN+  ....    12.71%     5.86%    10.61%    13.02%    (1.44)% 
RATIOS TO AVERAGE NET ASSETS: 
Expenses .....................     0.51%     0.51%     0.51%     0.54%     0.52% 
Net investment income.........     7.05%     7.25%     7.31%     7.51%     7.42% 
SUPPLEMENTAL DATA: 
Net assets, end of period, 
 in millions .................   $1,145    $1,010    $1,033     $908       $896 
Portfolio turnover rate  .....       10%       19%       13%       17%       37% 
</TABLE>
- ------------ 

+ Does not reflect the deduction of sales load. Calculated based on the net 
asset value as of the last business day of the period. 

                                3           
<PAGE>
THE FUND AND ITS MANAGEMENT 
- ----------------------------------------------------------------------------- 

   Dean Witter Tax-Exempt Securities Trust (the "Fund") is an open-end, 
diversified management investment company incorporated in Maryland on 
December 13, 1979. The Fund reorganized as a trust of the type commonly known 
as a "Massachusetts business trust" on April 30, 1987. 

   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, 30 of which 
are listed on the New York Stock Exchange, with combined total net assets of 
approximately $89.8 billion as of February 28, 1997. The Investment Manager 
also manages portfolios of pension plans, other institutions and individuals 
which aggregated approximately $3.2 billion at such date. 

   On February 5, 1997, DWDC and Morgan Stanley Group Inc. announced that 
they had entered into an Agreement and Plan of Merger, with the combined 
company to be named Morgan Stanley, Dean Witter, Discover & Co. The business 
of Morgan Stanley Group Inc. and its affiliated companies is providing a wide 
range of financial services for sovereign governments, corporations, 
institutions and individuals throughout the world. DWDC is the direct parent 
of InterCapital and Dean Witter Distributors Inc., the Fund's distributor. It 
is currently anticipated that the transaction will close in mid-1997. 
Thereafter, InterCapital and Dean Witter Distributors Inc. will be direct 
subsidiaries of Morgan Stanley, Dean Witter, Discover & Co. 

   The Fund has retained the Investment Manager to provide administrative 
services, manage its business affairs and manage the investment of the Fund's 
assets, including the placing of orders for the purchase and sale of 
portfolio securities. InterCapital has retained Dean Witter Services Company 
Inc. to perform the aforementioned administrative services for the Fund. 

   The Fund's 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 0.50% of the daily net assets of the Fund up to $500 million, scaled 
down at various asset levels to 0.325% on net assets over $1.25 billion. For 
the fiscal year ended December 31, 1996, the Fund accrued total compensation 
to the Investment Manager amounting to 0.43% of the Fund's average daily net 
assets and the Fund's total expenses amounted to 0.48% of the Fund's average 
daily net assets. 

INVESTMENT OBJECTIVE AND POLICIES 
- ----------------------------------------------------------------------------- 

   The investment objective of the Fund is to provide a high level of current 
income which is exempt from federal income tax, consistent with the 
preservation of capital. There is no assurance that this objective will be 
achieved. This objective is fundamental and may not be changed without 
shareholder approval. The Fund seeks to achieve its investment objective by 
investing its assets in accordance with the following policies: 


   1. At least 80% of the Fund's total assets will be invested in tax-exempt 
securities, except as stated in paragraph (5) below. Tax-exempt securities 
consist of Municipal Bonds and Municipal Notes ("Municipal Obligations") and 
Municipal Commercial Paper. 


   2. At least 75% of the Fund's total assets will be invested in: (a) 
Municipal Bonds which are rated at the time of purchase within the three 
highest grades by Moody's Investors Service, Inc. ("Moody's") or Standard & 
Poor's Corporation ("S&P"); (b) Municipal Notes which at the time of purchase 
are rated in the two highest grades by Moody's or S&P, or, if not rated, have 
outstanding one or more issues of Municipal Bonds rated as set forth in 
clause (a) of this paragraph; and (c) Municipal Commercial Paper which at the 
time of purchase are rated P-1 by Moody's or A-1 by S&P. 

   3. Up to 25% of the Fund's total assets may be invested in tax-exempt 
securities which are not rated by Moody's or S&P or, if rated, are not within 
the rating categories of Moody's or S&P stated in paragraph (2) above. 

   4. In accordance with the current position of the staff of the Securities 
and Exchange Commission, 

                                4           
<PAGE>
tax-exempt securities which are subject to the federal alternative minimum 
tax for individual shareholders will not be included in the 80% total 
described in paragraph 1 above. (See "Dividends, Distributions and Taxes," 
below.) As such, the remaining 20% of the Fund's total assets may be invested 
in tax-exempt securities subject to the alternative minimum tax. 

   5. Inclusive of paragraph 4 above, up to 20% of the Fund's total assets 
may be invested in taxable money market instruments under any one or more of 
the following circumstances: (a) pending investment of proceeds of sale of 
Fund shares or of portfolio securities; (b) pending settlement of purchases 
of portfolio securities; and (c) to maintain liquidity for the purpose of 
meeting anticipated redemptions. In addition, the Fund may temporarily invest 
more than 20% of its total assets in taxable 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. 
The types of taxable securities in which the Fund may temporarily 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 any of the foregoing portfolio securities. 

   Municipal Obligations are debt obligations of states, 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 refers to short-term 
obligations of municipalities. Any Municipal Obligation which depends 
directly or indirectly on the credit of the Federal Government shall be 
considered to have a rating of Aaa/AAA. 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. 

   While the Fund may invest up to 25% of its total assets in Municipal 
Obligations which are unrated or, if rated, are not within the three highest 
Bond rating categories of Moody's or S&P or the two highest Note rating 
categories of Moody's or S&P, the Fund does not intend to invest in Municipal 
Bonds which are rated below either Baa by Moody's or BBB by S&P (the lowest 
ratings considered investment grade) or, if not rated, are deemed by the 
Investment Manager to be below investment grade, in amounts exceeding 5% of 
its total assets. Investments in Municipal Bonds rated either Baa by Moody's 
or BBB by S&P 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. 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" obligations 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 
government 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. 

   Included within the revenue category 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 

                                5           
<PAGE>
provide that the governmental issuer has no obligation to make future 
payments under the lease or contract unless money is appropriated for such 
purpose by the appropriate legislative body on an annual or other periodic 
basis. Consequently, continued lease payments on those lease obligations 
containing "non-appropriation" clauses are dependent on future legislative 
actions. If such legislative actions do not occur, the holders of the lease 
obligation may experience difficulty in exercising their rights, including 
disposition of the property. 

   Lease obligations represent a type of financing that may not have the 
depth of marketability associated with more conventional municipal 
obligations, and, as a result, certain of such lease obligations may be 
considered illiquid 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 interest rates payable on certain Municipal Bonds and Municipal Notes 
are not fixed and may fluctuate based upon changes in market rates. Municipal 
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. 

   The foregoing percentage and rating policies apply at the time of 
acquisition of a security based on the last previous determination of the 
Fund's net asset value. Any subsequent change in any rating by a rating 
service 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 Investment Manager 
determines that it is practicable to sell the security without undue market 
or tax consequences to the Fund. 

   The ratings assigned by Moody's and S&P represent their opinions as to the 
quality of the securities which they undertake to rate (see the Appendix to 
the Statement of Additional Information). It should be emphasized, however, 
that the ratings are general and not absolute standards of quality. 

WHEN-ISSUED AND DELAYED DELIVERY SECURITIES. The Fund may purchase tax-exempt 
securities on a when-issued or delayed delivery basis; i.e., delivery and 
payment can take place a month or more after the date of the transaction. 
These securities are subject to market fluctuation and no interest accrues to 
the purchaser prior to settlement. At the time the Fund makes the commitment 
to purchase such securities, it will record the transaction and thereafter 
reflect the value, each day, of such securities in determining its net asset 
value. An increase in the percentage of the Fund's assets committed to the 
purchase of securities on a when-issued or delayed delivery 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. 

RISK CONSIDERATIONS AND INVESTMENT PRACTICES 

The value of the Fund's portfolio securities and, therefore, the Fund's net 
asset value per share, may increase or decrease due to various factors, 
principally changes in prevailing interest rates and the ability of the 
issuers of the Fund's portfolio securities to pay interest and principal on 
such obligations on a timely basis. Generally, a rise in interest rates will 
result in a decrease in the Fund's net asset value per share, while a drop in 
interest rates will result in an increase in the Fund's net asset value per 
share. The Fund's yield will also vary based on the yield of the Fund's 
portfolio securities. 

                                6           
<PAGE>
FUTURES CONTRACTS AND OPTIONS ON FUTURES. The Fund may enter into financial 
futures contracts ("futures contracts"), options on such futures and 
municipal bond index futures contracts for hedging purposes. The Fund may 
sell a futures contract or a call option thereon 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 futures contract or a call option thereon or 
sell a put option on such futures contract, to protect against an increase in 
the price of the securities the Fund intends to purchase. These futures 
contracts and related options thereon will be used only as a hedge against 
anticipated interest rate changes. A futures contract sale creates an 
obligation by the Fund, as seller, to deliver the specific type of instrument 
called for in the contract at a specified future time for a specified price. 
A futures contract purchase creates 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 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 futures contract, which requires the parties to buy and sell a 
security on a set date, an option on 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 not daily payments of cash to 
reflect the change in the value of the underlying contract as there are 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 futures contracts may correlate imperfectly with the behavior of the cash 
prices of the Fund's portfolio securities. The risk of imperfect correlation 
may be increased by the fact that the Fund will invest in futures contracts 
on taxable 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 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 options on futures 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 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 purchase related options 
thereon if immediately thereafter the amount committed to margin plus the 
amount paid for premiums for unexpired options on futures contracts exceeds 
5% of the value of the Fund's total assets. The Fund may not purchase or sell 
futures contracts or related options thereon if, immediately thereafter, more 
than one-third of its net assets would be hedged. 

   For a discussion of the risks of certain types of Municipal Obligations, 
such as lease obligations, see above in "Investment Objective and Policies." 

                                7           
<PAGE>
PORTFOLIO MANAGEMENT 

The Fund is actively 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 February 28, 1997. James F. Willison, Senior Vice 
President of InterCapital and Manager of InterCapital's Municipal Fixed 
Income Group and Joseph R. Arcieri, Vice President of InterCapital and a 
member of InterCapital's Municipal Fixed Income Group, have been the primary 
portfolio co-managers of the Fund since its inception and February, 1997, 
respectively, and have been portfolio managers at InterCapital for over five 
years. 

   Securities are purchased and sold principally in response to the 
Investment Manager's current evaluation of an issuer's ability to meet its 
debt obligations in the future, and the Investment Manager's current 
assessment of future changes in the levels of interest rates on tax-exempt 
securities of varying maturities. Securities purchased by the Fund are, 
generally, sold by dealers acting as principal for their own accounts. 
Pursuant to an order of the Securities and Exchange Commission, the Fund may 
effect principal transactions in certain money market instruments with DWR. 
In addition, the Fund may incur brokerage commissions on transactions 
conducted through DWR. 

   The portfolio trading engaged in by the Fund may result in its portfolio 
turnover rate exceeding 100%. The Fund will incur underwriting discount costs 
(on underwritten securities) commensurate with its portfolio turnover rate. 
Additionally, see "Dividends, Distributions and Taxes" for a discussion of 
the tax policy of the Fund. A more extensive discussion of the Fund's 
portfolio brokerage policies is set forth in the Statement of Additional 
Information. 

   Except as specifically noted, all investment objectives, policies and 
practices discussed above are not fundamental policies of the Fund and, as 
such, may be changed without shareholder approval. 

INVESTMENT RESTRICTIONS 
- ----------------------------------------------------------------------------- 

   The investment restrictions listed below are among the restrictions which 
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. 

   For purposes of the following restrictions: (a) an "issuer" of a security 
is the entity whose assets and revenues are committed to the payment of 
interest and principal on that particular security, provided that the 
guarantee of a security will be considered a separate security, and provided 
further that a guarantee of a security shall not be deemed to be a security 
issued by the guarantor if the value of all securities issued or guaranteed 
by the guarantor and owned by the Fund does not exceed 10% of the value of 
the total assets of the Fund; (b) a "taxable security" is any security the 
interest on which is subject to federal income tax; and (c) all percentage 
limitations apply immediately after a purchase or initial investment, and any 
subsequent change in any applicable percentage resulting from market 
fluctuations or other changes in the Fund's total assets does not require 
elimination of any security from the portfolio. 

The Fund may not: 

   1. Invest more than 5% of the value of its total assets in the securities 
of any one issuer (other than obligations issued or guaranteed by the United 
States Government, its agencies or instrumentalities). 

   2. Purchase more than 10% of all outstanding taxable debt securities or 
any one issuer (other than obligations issued, or guaranteed as to principal 
and interest, by the United States Government, its agencies or 
instrumentalities). 

   3. Invest more than 25% of the value of its total assets in securities of 
issuers in any one industry. This restriction does not apply to obligations 
issued or guaranteed by the United States Government, its agencies or 
instrumentalities or to cash equivalents (industrial development and 
pollution control bonds are grouped into industries based upon the business 
in which the issuers of such obligations are engaged). 

   4. Invest more than 5% of the value of its total assets in taxable 
securities of issuers having a record, together with predecessors, of less 
than three years of continuous operation. This restriction shall not apply to 
any obligation of the United States Government, its agencies or 
instrumentalities. 

                                8           
<PAGE>
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 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 Tax-Exempt 
Securities Trust, directly to Dean Witter Trust Company (the "Transfer 
Agent") at P.O. Box 1040, Jersey City, N.J. 07303 or by contacting a DWR or 
other Selected Broker-Dealer account executive. The minimum initial purchase 
in the case of investments through EasyInvest (Service Mark), 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. 

   In the case of purchases made pursuant to systematic payroll deduction 
plans (including individual retirement plans), the Fund, in its discretion, 
may accept such purchases without regard to any minimum amounts which would 
otherwise be required if the Fund has reason to believe that additional 
purchases will increase the amount of the purchase of shares in all accounts 
under such plans to at least $1,000. 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), plus a sales charge (expressed as a percentage of the offering 
price) on a single transaction as shown in the following table: 

<TABLE>
<CAPTION>
                                             SALES CHARGE 
                                   ------------------------------- 
                                    PERCENTAGE OF     APPROXIMATE 
             AMOUNT OF                  PUBLIC       PERCENTAGE OF 
        SINGLE TRANSACTION          OFFERING PRICE  AMOUNT INVESTED 
- ---------------------------------  --------------  --------------- 
<S>                                <C>             <C>
Less than $25,000.................       4.00%           4.17% 
$25,000 but less than $50,000 ....       3.50            3.63 
$50,000 but less than $100,000 ...       3.25            3.36 
$100,000 but less than $250,000 ..       2.75            2.83 
$250,000 but less than $500,000 ..       2.50            2.56 
$500,000 but less than 
 $1,000,000.......................       1.75            1.78 
$1,000,000 and over...............       0.50            0.50 
</TABLE>

   Upon notice to all Selected Broker-Dealers, the Distributor may reallow up 
to the full applicable sales charge as shown in the above schedule during 
periods specified in such notice. During periods when substantially the 
entire sales charge is reallowed, such Selected Broker-Dealers may be deemed 
to be underwriters as that term is defined in the Securities Act of 1933, as 
amended. 

   The above schedule of sales charges is applicable to purchases in a single 
transaction by, among others: (a) an individual; (b) an individual, his or 
her spouse and their children under the age of 21 purchasing shares for his 
or her own accounts; (c) a trustee or other fiduciary purchasing shares for a 
single trust estate or a single fiduciary account; (d) a pension, 
profit-sharing or other employee benefit plan qualified or non-qualified 
under Section 401 of the Internal Revenue Code; (e) tax-exempt organizations 
enumerated in Section 501(c)(3) or (13) of the Internal Revenue Code; (f) 
employee benefit plans qualified under Section 401 of the Internal Revenue 
Code of a single employer or of employers who are "affiliated persons" of 
each other within the meaning of Section 2(a)(3)(c) of the Act; or (g) any 
other organized group of persons, whether incorporated or not, provided the 
organization has been in existence for at least six months and has some 
purpose other than the purchase of redeemable securities of a registered 
investment company at a discount. 

   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. 

   Shares of the Fund 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 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. The Fund 
and/or the Distributor reserve the right to reject any purchase order. 

                                9           
<PAGE>
ANALOGOUS DEAN WITTER FUNDS. The Distributor and the Investment Manager serve 
in the same capacities for Dean Witter National Municipal Trust, an open-end 
investment company with investment objectives and policies similar to those 
of the Fund. Unlike the Fund, however, shares of Dean Witter National 
Municipal Trust are offered to the public at net asset value, with a 
contingent deferred sales charge assessed upon redemptions within three years 
of purchase, as well as an annual Rule 12b-1 distribution fee, rather than a 
sales charge imposed at the time 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 National Municipal 
Trust should call the telephone numbers listed on the front cover of this 
Prospectus, or may call their account executive for additional information. 

REDUCED SALES CHARGES 

COMBINED PURCHASE PRIVILEGE. Investors may have the benefit of reduced sales 
charges in accordance with the above schedule by combining purchases of 
shares of the Fund in single transactions with the purchase of shares of Dean 
Witter High Yield Securities Inc. and of Dean Witter Funds which are sold 
with a contingent deferred sales charge ("CDSC funds"). The sales charge 
payable on the purchase of shares of the Fund and Dean Witter High Yield 
Securities Inc. will be at their respective rates applicable to the total 
amount of the combined concurrent purchases of the Fund, Dean Witter High 
Yield Securities Inc. and CDSC funds. 

RIGHT OF ACCUMULATION. The above persons and entities may also benefit from a 
reduction of the sales charges in accordance with the above schedule if the 
cumulative net asset value of shares purchased in a single transaction, 
together with shares previously purchased (including shares of Dean Witter 
High Yield Securities Inc. and CDSC funds, and of certain Dean Witter funds 
acquired in exchange for shares of such funds) which are held at the time of 
such transaction, amounts to $25,000 or more. 

   The Distributor must be notified by DWR or other Selected Broker-Dealer or 
the shareholder at the time a purchase order is placed that the purchase 
qualifies for the reduced charge under the Right of Accumulation. Similar 
notification must be made in writing by the dealer or shareholder when such 
an order is placed by mail. The reduced sales charge will not be granted if: 
(a) such notification is not furnished at the time of the order; or (b) a 
review of the records of the Selected Broker-Dealer or the Transfer Agent 
fails to confirm the investor's represented holdings. 

LETTER OF INTENT. The foregoing schedule of reduced sales charges will also 
be available to investors who enter into a written Letter of Intent providing 
for the purchase, within a thirteen-month period, of shares of the Fund from 
DWR or another Selected Broker-Dealer. The cost of shares of the Fund or 
shares of Dean Witter High Yield Securities Inc. which were previously 
purchased at a price including a front-end sales charge during the 90-day 
period prior to the date of receipt by the Distributor of the Letter of 
Intent, or of shares of other Dean Witter Funds acquired in exchange for 
shares of such funds acquired during such period at a price including a 
front-end sales charge, which are still owned by the shareholder, may also be 
included in determining the applicable reduction. 

DETERMINATION OF NET ASSET VALUE 

The net asset value per share of the Fund is determined once daily at 4:00 
p.m., New York time, on each day that the New York Stock Exchange is open 
(or, on days when the New York Stock Exchange closes prior to 4:00 p.m., at 
such earlier time), by taking the value of all assets of the Fund, 
subtracting its liabilities, dividing by the number of shares outstanding and 
adjusting to the nearest cent. The net asset value per share will not be 
determined on Good Friday and on such other federal and non-federal holidays 
as are observed by the New York Stock Exchange. 

   Portfolio securities (other than short-term taxable debt securities, 
futures and options) are valued for the Fund by an outside independent 
pricing service approved by the Fund's Trustees. The service may utilize 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 
services are more likely to approximate the fair value of such securities. 

   Short-term taxable debt securities with remaining maturities of 60 days or 
less at time of purchase are valued at amortized cost, unless the Board 
determines such does not reflect the securities' market value, in which case 
these securities will be valued at their fair value as determined by the 
Board of Trustees. Other taxable short-term debt securities with maturities 
of more than 60 days will be valued on a mark to market basis until such time 
as they reach a maturity of 60 days, whereupon they will be valued at 
amortized cost using their value on the 61st day unless the Trustees 
determine 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. Listed options on debt securities are valued at the 
latest sale price on the exchange on which they are listed unless no sales of 
such options have taken place that day, in which case, they will be valued at 
the mean between their closing bid and asked prices. Unlisted options on 

                               10           
<PAGE>
debt securities are valued at the mean between their latest bid and asked 
price. Futures are valued at the latest sale price on the commodities 
exchange on which they trade unless the Board of Trustees determines that 
such price does not reflect their fair value, in which case they will be 
valued at their fair market value as determined by the Board of Trustees. All 
other securities and other assets are valued at their fair value as 
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 that they be paid in cash. Each purchase of shares of 
the Fund is made upon the condition that the Transfer Agent is thereby 
automatically appointed as agent of the investor to receive all dividends and 
capital gains distributions on shares owned by the investor. Such dividends 
and distributions will be paid, at the net asset value per share (without 
sales charge), 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 checks during the first ten days 
of the following month. 

EASYINVEST (SERVICE MARK). 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"). 

SYSTEMATIC WITHDRAWAL PLAN. A 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 plan provides for monthly or 
quarterly (March, June, September, December) checks in any dollar amount, not 
less than $25, or in any whole percentage of the account balance, on an 
annualized basis. 

   Withdrawal plan payments should not be considered as dividends, yields or 
income. If periodic withdrawal plan payments continuously exceed net 
investment income and net capital gains, the shareholder's original 
investment will be correspondingly reduced and ultimately exhausted. 

   Each withdrawal constitutes a redemption of shares and any gain or loss 
realized must be recognized for federal income tax purposes. Although the 
shareholder may make additional investments of $2,500 or more under the 
Systematic Withdrawal Plan, withdrawals made concurrently with purchases of 
additional shares are inadvisable because of the sales charges applicable to 
the purchase of additional shares. 

   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 front-end (at time of purchase) sales charge 
("FESC" funds), Dean Witter Funds sold with a contingent deferred sales 
charge ("CDSC funds"), five Dean Witter Funds which are money market funds 
and Dean Witter Short-Term U.S. Treasury Trust, Dean Witter Short-Term Bond 
Fund, Dean Witter Limited Term Municipal Trust, Dean Witter Balanced Income 
Fund, Dean Witter Balanced Growth Fund and Dean Witter Intermediate Term U.S. 
Treasury Trust (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 holding period for exchanges of shares acquired by exchange or dividend 
reinvestment. However, shares of CDSC funds, including shares acquired in 
exchange for shares of FESC funds, may not be exchanged for shares of FESC 
funds. Thus, shareholders who exchange their Fund shares for shares of CDSC 
funds may subsequently exchange those shares for shares of other CDSC funds 
or money market funds but may not reacquire FESC fund shares by exchange. 

   An exchange to another FESC fund, to a CDSC fund, or to 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 

                               11           
<PAGE>
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 Exchange Funds, FESC funds and CDSC funds can be 
effected on the same basis (except that CDSC fund shares may not be exchanged 
for shares of FESC funds). Shares of a CDSC fund acquired in exchange for 
shares of an FESC fund (or in exchange for shares of other Dean Witter Funds 
for which shares of an FESC fund have been exchanged) are not subject to any 
contingent deferred sales charge 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 shoud 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. 

   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 objectives 
and policies, and shareholders should obtain one and read it carefully before 
investing. Exchanges are subject to the minimum investment requirement and 
other conditions imposed by each fund. In the case of any shareholder holding 
a share certificate or certificates, no exchanges may be made until the share 
certificate(s) have been received by the Transfer Agent and deposited in the 
shareholder's account. An exchange will be treated for federal income tax 
purposes as a redemption or repurchase of shares, on which the shareholder 
may realize a capital gain or loss. However, the ability to deduct capital 
losses on an exchange is limited in situations where there is an exchange of 
shares within ninety days after the shares are purchased. There are also 
limits on the deduction of losses after the payment of exempt-interest 
dividends for shares held for less than six months (see "Dividends, 
Distributions and Taxes"). The Exchange Privilege is only available in states 
where an exchange may legally be made. 

   If DWR or another Selected Broker-Dealer is the current dealer of record 
and its account numbers are part of the account information, shareholders may 
initiate an exchange of shares of the Fund for shares of any of the Dean 
Witter Funds (for which the Exchange Privilege is available) pursuant to this 
Exchange Privilege by contacting their DWR or other Selected Broker-Dealer 
account executive (no Exchange Privilege Authorization Form is required). 
Other shareholders (and those shareholders who are clients of DWR or another 
Selected Broker-Dealer but who wish to make exchanges directly by writing or 
telephoning the Transfer Agent) must complete and forward to the Transfer 
Agent an Exchange Privilege Authorization form, copies of which may be 
obtained from the Transfer Agent, to initiate an exchange. If the 
Authorization Form is used, exchanges may be made 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 Broker-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 (see "Redemptions and Repurchases"). 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. 

   For further information regarding the Exchange Privilege, shareholders 
should contact their DWR or other Selected Broker-Dealer account executive or 
the Transfer Agent. 

                               12           
<PAGE>
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 (without any redemption or other 
charge). If shares are held in a shareholder's account without a share 
certificate, a written request for redemption is required. If certificates 
are held by the shareholder(s), the shares may be redeemed by surrendering 
the certificate(s) with a written request for redemption, along with any 
additional information required by the Transfer Agent. 

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 and other Selected Broker-Dealers 
upon the telephonic request of the shareholder. The repurchase price is the 
net asset value next determined (see "Purchase of Fund Shares--Determination 
of Net Asset Value") after such repurchase order is received by DWR or other 
Selected Broker-Dealer. Payment for shares repurchased may be made by the 
Fund to the Distributor for the account of the shareholder. The offers by DWR 
and other Selected Broker-Dealers to repurchase shares from shareholders may 
be suspended 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 at times when normal trading is not taking place on the New York 
Stock Exchange. If the shares to be redeemed have recently been purchased by 
check, payment of the redemption proceeds may be delayed for the minimum time 
needed to verify that the check used for investment has been honored (not 
more than fifteen days from the time of investment of the check by the 
Transfer Agent). Shareholders maintaining margin accounts with DWR or another 
Selected Broker-Dealer are referred to their account executive regarding 
restrictions on redemption of shares of the Fund pledged in the margin 
account. 

REINSTATEMENT PRIVILEGE. A shareholder who has had his or her share redeemed 
or repurchased and has not previously exercised this reinstatement privilege 
may, within 30 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 their net asset value (without a sales charge) next determined 
after a reinstatement request, to gether with the proceeds, is received by 
the Transfer Agent. 

INVOLUNTARY REDEMPTION. The Fund reserves the right, on sixty days notice, to 
redeem at net asset value, the shares of any shareholder whose shares have a 
value of less than $100 as a result of redemptions or repurchases, or such 
lesser amount as may be fixed by the Board of Trustees or, in the case of an 
account opened through EasyInvest, if after twelve months the shareholder has 
invested less than $1,000 in the account. However, before the Fund redeems 
such shares and sends the proceeds to the shareholder, it will notify the 
shareholder that the value of the shares is less than the applicable amount 
and allow the shareholder to make an additional investment in an amount which 
will increase the value of the account to at least the applicable amount 
before the redemption is processed. No charge 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 paid 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 realized 
short-term capital gains in excess of any realized net long-term capital 
losses, if any. The Fund intends to distribute all of its realized net 
long-term capital gains, if any, in excess of any realized net short-term 
capital losses and any available net capital loss carryovers, at least once 
per fiscal year, although it may elect to retain all or part of such gains 
for reinvestment. Taxable capital gains may be generated by the sale of 
portfolio securities and by transactions in options and futures contracts 
engaged in by the Fund. 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 
and such request is received by the close of business on the day prior to the 
record date for such distributions (see "Shareholder Services--Automatic 
Investment of Dividends and Distributions"). Any dividends declared in the 
last quarter of any calendar year which are paid in the following calendar 
year prior to February 1 will be deemed received by the shareholder in the 
prior calendar year. 

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<PAGE>
TAXES. Because the Fund intends to distribute all of its net investment 
income and capital gains to shareholders and intends to otherwise continue to 
qualify as a regulated investment company under Subchapter M of the Internal 
Revenue Code, 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, distributions from net investment 
income to shareholders, whether taken in cash or reinvested in additional 
shares, will be excludable from gross income for federal income tax purposes 
to the extent net investment income is represented by interest on tax-exempt 
securities. 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 Internal Revenue 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 
certain "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 
government 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. The 
Fund anticipates that a portion of its investments will 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 also have 
to include exempt-interest dividends in calculating their alternative minimum 
taxable income in situations where the "adjusted current earnings" of the 
corporation exceeds its alternative minimum taxable income. 

   Under the Revenue Reconciliation Act of 1993, all or a portion of the 
Fund's gain from the sale or redemption of tax-exempt obligations purchased 
at a market discount after April 30, 1993 will be treated as ordinary income 
rather than capital gain. This rule may increase the amount of ordinary 
income dividends received by shareholders. 

   Within sixty days after the end of its fiscal year, the Fund will mail to 
its shareholders a statement indicating the percentage of the 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. 

   Shareholders will normally be subject to federal income tax on dividends 
paid from interest income derived from taxable securities and on 
distributions of net short-term capital gains, if any. Distributions of 
long-term capital gains, if any, are taxable as long-term capital gains, 
regardless of how long the shareholder has held the Fund shares and 
regardless of whether the distribution is received in additional shares or in 
cash. To avoid being subject to a 31% federal backup withholding tax on 
taxable dividends, capital gains distributions and proceeds of redemptions or 
repurchases, shareholders' taxpayer identification numbers must be furnished 
and certified as to accuracy. 

   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 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 income tax purposes. 

   The exemption of interest income for federal income tax purposes does not 
necessarily result in exemption under the income or other tax laws of any 
state or local taxing authority. Thus, shareholders of the Fund may be 
subject to state and local taxes on exempt-interest dividends. 

   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. 

   Shareholders should consult their tax advisers as to the applicability of 
the above to their own tax situation. 

PERFORMANCE INFORMATION 
- ----------------------------------------------------------------------------- 

   From time to time the Fund may quote its "yield" and/or its "total return" 
in advertisements and sales literature. Both the yield and the total return 
of the Fund are based on historical earnings and are not intended to indicate 
future performance. The yield of the Fund is computed by dividing the Fund's 
net investment income over a 

                               14           
<PAGE>
30-day period by an average value (using the average number of shares 
entitled to receive dividends and the maximum offering price 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 
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 of $1,000 over periods of one, five and ten 
years. 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 incurred by 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 imposition of the front-end 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 or $100,000 in shares of the 
Fund by adding 1 to the Fund's aggregate total return to date and multiplying 
by $9,600, $48,375 or $97,250 ($10,000, $50,000 or $100,000 adjusted for 
4.00%, 3.25% and 2.75% sales charges, respectively). The Fund from time to 
time may also advertise its performance relative to certain performance 
rankings and indexes compiled by independent organizations (such as mutual 
fund performance rankings of Lipper Analytical Services, Inc.). 

ADDITIONAL INFORMATION 
- ----------------------------------------------------------------------------- 

VOTING RIGHTS. All shares of beneficial interest of the Fund are of $.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 in 
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 share holder held personally liable for the obligations of the Fund. 
Thus, the risk of a shareholder incurring financial loss on account of 
shareholder liability is limited to circumstances in which the Fund itself 
would be unable to meet its obligations. Given the above limitations on 
shareholder personal liability and the nature of the Fund's assets and 
operations, the possibility of the Fund's being unable to meet its 
obligations is remote and, in the opinion of Massachusetts counsel to the 
Fund, the risk to Fund shareholders of personal liability is remote. 

CODE OF ETHICS. Directors, officers and employees of InterCapital, Dean 
Witter Services Company Inc. and the Distributor are subject to a strict Code 
of Ethics adopted by those companies. The Code of Ethics is intended to 
ensure that the interests of shareholders and other clients are placed ahead 
of any personal interest, that no undue personal benefit is obtained from a 
person's employment activities and that actual and potential conflicts of 
interest are avoided. To achieve these goals and comply with regulatory 
requirements, the Code of Ethics requires, among other things, that personal 
securities transactions by employees 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 also 
prohibits engaging in futures and options transactions and profiting on 
short-term trading (that is, a purchase within 60 days of a sale or a sale 
within 60 days of a purchase) of a security. In addition, investment 
personnel may not purchase or sell a security for their personal account 
within 30 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. 

                               15           
<PAGE>
DEAN WITTER 
TAX-EXEMPT SECURITIES TRUST 
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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