ACTIVE ASSETS TAX FREE TRUST
497, 1995-09-20
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<PAGE>
                           ACTIVE ASSETS MONEY TRUST
                          ACTIVE ASSETS TAX-FREE TRUST
                    ACTIVE ASSETS CALIFORNIA TAX-FREE TRUST
                   ACTIVE ASSETS GOVERNMENT SECURITIES TRUST
                              --------------------

    THIS  DOCUMENT CONSISTS  OF THE PROSPECTUSES  OF ACTIVE  ASSETS MONEY TRUST,
ACTIVE ASSETS TAX-FREE TRUST, ACTIVE ASSETS CALIFORNIA TAX-FREE TRUST AND ACTIVE
ASSETS GOVERNMENT SECURITIES TRUST (COLLECTIVELY, THE "TRUSTS") AND AN  APPENDIX
TO  SUCH PROSPECTUSES  WHICH CONSTITUTES  PART OF  THE PROSPECTUSES.  A TABLE OF
CONTENTS IS CONTAINED ON PAGE 1 OF EACH PROSPECTUS.
                            ------------------------

    Each Trust is a diversified  open-end management investment company  seeking
high  current income, preservation of capital  and liquidity from investments in
short-term securities.  Active  Assets  Money  Trust  invests  in  money  market
instruments  generally; Active  Assets Tax-Free  Trust invests  in high quality,
short-term tax-exempt securities and pays dividends exempt from federal personal
income taxation;  Active  Assets  California  Tax-Free  Trust  invests  in  high
quality,  short-term California tax-exempt securities  and pays dividends exempt
from  federal  and  California  personal  income  taxation;  and  Active  Assets
Government  Securities  Trust  invests  in money  market  instruments  issued or
guaranteed by the United States Government or its agencies or instrumentalities.

    The Active Assets -Registered  Trademark- Account financial service  program
("Active Assets") of Dean Witter Reynolds Inc. ("Dean Witter") provides a medium
for  the  investment of  free credit  cash  balances held  in the  Active Assets
account in shares  of the  Trusts. An  Active Assets  account is  a Dean  Witter
securities  account (the "Securities Account") which  is linked to the Trusts, a
Federal Deposit Insurance Corporation ("FDIC") insured bank account (the "Active
Assets Insured  Account")  maintained  at  a bank  which  has  entered  into  an
agreement   with   Dean  Witter   to  participate   in   Active  Assets   and  a
Visa-Registered Trademark- check/card account maintained by Bank One,  Columbus,
N.A., Columbus, Ohio ("Visa Account").

    The  annual fee for participation in  the Active Assets program is presently
$80 ($100 for  corporations). Dean Witter  may charge certain  group or  special
accounts  a different fee. Dean Witter reserves  the right to change the fee for
participation in the  Active Assets  program at any  time. As  described in  the
Appendix to the Prospectus under the section "Purchase of Shares", shares of the
Trusts  may be purchased  by investors maintaining  brokerage accounts with Dean
Witter who  are not  subscribers  to the  Active  Assets program.  In  addition,
certain other Securities Accounts which are not subscribers to the Active Assets
Program  may be  linked to  the Trusts  and the  Active Assets  Insured Account.
Shareholders of the Trusts not subscribing to the Active Assets program will not
be charged the program fee.

    Subject to  the conditions  set forth  herein, a  subscriber to  the  Active
Assets  program  will have  his or  her free  credit cash  balances held  in the
account automatically  invested  daily  in  shares  of  any  of  the  Trusts  or
transmitted  to the  bank for  deposit into  the Active  Assets Insured Account,
depending upon which investment is selected  by the investor, and earn a  return
thereon  pending further investment of such funds in other aspects of the Active
Assets program or utilization  through the Visa  Account. A program  participant
may make additional investments in or change his or her chosen investment at any
time  by following the procedures set forth  in the Appendix under "Purchase and
Redemption of Shares".
                            ------------------------

    THE INFORMATION IN THIS DOCUMENT SHOULD BE READ IN CONJUNCTION WITH THE DEAN
WITTER  CLIENT  AGREEMENT  WHICH  IS  BEING  FURNISHED  TO  ALL  ACTIVE   ASSETS
SUBSCRIBERS  (OR OTHER ACCOUNT AGREEMENT  FOR NON-ACTIVE ASSETS SUBSCRIBERS) AND
WILL BE FURNISHED TO NEW SUBSCRIBERS PRIOR TO THE TIME AN ACTIVE ASSETS ACCOUNT,
OR OTHER SECURITIES ACCOUNT, IS OPENED.  REFERENCE IS MADE TO SUCH MATERIAL  FOR
INFORMATION  WITH RESPECT TO THE ACTIVE ASSETS AND OTHER PROGRAMS, INCLUDING THE
FEES RELATED THERETO. FOR MORE COMPLETE DETAILS ABOUT THE ACTIVE ASSETS  INSURED
ACCOUNT,  INCLUDING  PROCEDURES FOR  TRANSFERRING FROM  ANY  OF THE  TRUSTS, THE
SUBSCRIBER SHOULD CONSULT HIS OR HER DEAN WITTER ACCOUNT EXECUTIVE.

      For information on participation in the Active Assets program and
  information relating to a specific account, call:
     - Anywhere in the United        - In New York City (212)
     States, Puerto Rico and the       392-5000
       Virgin Islands toll free at
       (800) 869-3326

ACTIVE ASSETS IS A REGISTERED TRADEMARK OF DEAN WITTER REYNOLDS INC.  AUGUST 29,
1995
<PAGE>
TRUSTEES AND OFFICERS

ACTIVE ASSETS MONEY TRUST
ACTIVE ASSETS TAX-FREE TRUST
ACTIVE ASSETS CALIFORNIA TAX-FREE TRUST
ACTIVE ASSETS GOVERNMENT SECURITIES TRUST

TRUSTEES

Jack F. Bennett
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Dr. Manuel H. Johnson
Paul Kolton
Michael E. Nugent
Philip J. Purcell
John L. Schroeder

OFFICERS

Charles A. Fiumefreddo
Chairman and Chief Executive Officer

Sheldon Curtis
Vice President, Secretary and
General Counsel

Jonathan R. Page
Vice President

Katherine H. Stromberg
Vice President

Thomas F. Caloia
Treasurer
<PAGE>
                           ACTIVE ASSETS MONEY TRUST

       TWO WORLD TRADE CENTER, NEW YORK, NEW YORK 10048 - (212) 392-5000

    Active  Assets Money Trust (the "Money Trust"  or the "Trust") is a no-load,
diversified open-end management investment company the investment objectives  of
which  are high current income, preservation of capital and liquidity. The Trust
is authorized to reimburse Dean  Witter Distributors Inc. for specific  expenses
incurred  in promoting the distribution of the Trust's shares pursuant to a Plan
of Distribution pursuant to Rule 12b-1 under the Investment Company Act of 1940,
as amended (the "Act"). Reimbursement may in no event exceed an amount equal  to
payments  at the  annual rate of  0.15% of the  average daily net  assets of the
Trust.

    The Trust will invest in a diversified portfolio of short-term money  market
instruments   consisting  primarily  of  United  States  Government  securities,
obligations of U.S.  regulated banks  and savings and  loan associations  having
assets  of $1  billion or  more, certificates  of deposit  of savings  banks and
savings and loan associations  having total assets of  $1 billion or more,  high
grade commercial paper, high grade corporate obligations maturing in one year or
less and certificates of deposit of $100,000 or less of U.S. regulated banks and
savings  institutions, having  total assets of  less than $1  billion, which are
fully insured by the FDIC.

    AN INVESTMENT IN  THE TRUST IS  NEITHER INSURED NOR  GUARANTEED BY THE  U.S.
GOVERNMENT.  THERE IS  NO ASSURANCE THAT  THE TRUST  WILL BE ABLE  TO MAINTAIN A
STABLE NET ASSET VALUE OF $1.00 PER SHARE.

    SHARES OF THE  TRUST 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.
                               TABLE OF CONTENTS

<TABLE>
<S>                                                 <C>
Highlights/2                                        How Net Asset Value is Determined/A-4
Summary of Trust Expenses/3                         Confirmations/A-5
Financial Highlights/3                              The Trusts and Their Management/A-5
Investment Objectives and Policies/4                Plan of Distribution/A-6
Investment Restrictions/5                           Dividends, Distributions and Taxes/A-6
Purchase and Redemption of Shares/A-1               General Information/A-9
    Purchase of Shares/A-1                          Voting Rights/A-9
    Purchase of Shares by Non-Participants in       Custodian/A-10
      Active Assets Program/A-2                     Shareholder Inquiries/A-10
    Redemption of Shares/A-3
    Redemption of Shares by Non-Participants in
      Active Assets Program/A-4
</TABLE>

    THIS PROSPECTUS SETS FORTH CONCISELY THE INFORMATION YOU SHOULD KNOW  BEFORE
INVESTING  IN THE TRUST.  IT SHOULD BE  READ AND RETAINED  FOR FUTURE REFERENCE.
ADDITIONAL INFORMATION  ABOUT  THE  TRUST  IS  CONTAINED  IN  THE  STATEMENT  OF
ADDITIONAL  INFORMATION, DATED  AUGUST 29, 1995,  WHICH HAS BEEN  FILED WITH THE
SECURITIES AND EXCHANGE  COMMISSION, AND WHICH  IS AVAILABLE AT  NO CHARGE  UPON
REQUEST  OF THE  TRUST AT  THE ADDRESS  LISTED ABOVE  OR BY  CALLING DEAN WITTER
INTERCAPITAL  INC.  (THE  "INVESTMENT  MANAGER"  OR  "INTERCAPITAL")  AT   (212)
392-2550.  THE  STATEMENT OF  ADDITIONAL INFORMATION  IS INCORPORATED  HEREIN BY
REFERENCE.

    THE INFORMATION IN THIS  PROSPECTUS SHOULD BE READ  IN CONJUNCTION WITH  THE
INFORMATION APPEARING ELSEWHERE IN THIS DOCUMENT, INCLUDING THE APPENDIX HERETO,
WHICH IS PART OF THIS PROSPECTUS, AND IN THE DEAN WITTER CLIENT AGREEMENT.

  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.
                           --------------------------

                THE DATE OF THIS PROSPECTUS IS AUGUST 29, 1995.

                           ACTIVE ASSETS MONEY TRUST
<PAGE>
HIGHLIGHTS

   
<TABLE>
<S>                    <C>
THE                    A   no-load,  open-end  diversified  management  investment   company  investing  in  money  market
TRUST                  instruments. The  Trust is  authorized to  reimburse  Dean Witter  Distributors Inc.  for  specific
                       expenses  incurred  in promoting  the distribution  of the  Trust's  shares pursuant  to a  Plan of
                       Distribution pursuant to Rule  12b-1 under the Act.  (See page A-6). The  Trust is organized as  an
                       unincorporated business trust under the laws of Massachusetts. (See page A-5).
------------------------------------------------------------------------------------------------------------------------
SHARES                 The  shares of the  Money Trust are  offered to participants  in the Active  Assets program of Dean
OFFERED                Witter and to non-participants who wish to invest  directly in shares of the Trust (See page  A-2).
                       The  primary components of the Active Assets program are the Securities Account, which is linked to
                       the Active Assets Insured Account,  the Money Trust, the Active  Assets Tax-Free Trust, the  Active
                       Assets  California Tax-Free Trust or the Active Assets  Government Securities Trust and to the Visa
                       Account. See the Dean Witter Client Agreement for further information.
------------------------------------------------------------------------------------------------------------------------
PURCHASE               Pursuant to the Dean Witter Client Agreement between Dean Witter and the customer, free credit cash
OF SHARES              balances will be automatically invested in shares of the Money Trust daily at their net asset value
                       without any sales charge. Dean Witter Distributors Inc. is the Distributor of shares of the  Trust.
                       Investments  in shares are made under the circumstances described under "Purchase and Redemption of
                       Shares" (see  page  A-1).  Non-participants in  the  Active  Assets program  should  refer  to  the
                       discussion appearing at page A-2.
------------------------------------------------------------------------------------------------------------------------
INVESTMENT             High  current income, preservation of capital and liquidity (see page 4). There can be no assurance
OBJECTIVES             that the Trust's objectives can be achieved.
------------------------------------------------------------------------------------------------------------------------
AUTHORIZED             Money market instruments as follows (see page 4):
INVESTMENTS            - United States Government securities;
                       -   Obligations   of   U.S.   regulated   banks   having   assets   of   $1   billion   or    more;
                       - High grade commercial paper;
                       - High grade corporate obligations maturing in one year or less;
                       -  Certificates of deposit of savings banks and savings institutions having assets of $1 billion or
                       more;
                       - Certificates of deposit of  $100,000 or less, of U.S.  regulated banks and savings  institutions,
                       having    total   assets   of    less   than   $1    billion,   fully   insured    by   the   FDIC;
                       - Repurchase Agreements (see page 4).
------------------------------------------------------------------------------------------------------------------------
INVESTMENT             Dean Witter  InterCapital  Inc.,  the  Investment  Manager  of  the  Trust,  and  its  wholly-owned
MANAGER                subsidiary,  Dean Witter Services Company, Inc.,  serve in various investment management, advisory,
                       management and administrative capacities to  ninety-four investment companies and other  portfolios
                       with assets of approximately $73.2 billion at June 30, 1995 (see page A-5).
------------------------------------------------------------------------------------------------------------------------
MANAGEMENT             Monthly  fee at an annual rate of 1/2 of 1% of average daily net assets, scaled down on assets over
FEE                    $500 million (see page A-5).
------------------------------------------------------------------------------------------------------------------------
DISTRIBUTOR            Dean Witter Distributors  Inc. (the "Distributor")  sells shares  of the Fund  through Dean  Witter
                       Reynolds  Inc.  Other  than  the  reimbursement  to the  Distributor  pursuant  to  the  Rule 12b-1
                       Distribution Plan, the Distributor receives no distribution fees (see page A-2).
------------------------------------------------------------------------------------------------------------------------
PLAN OF                The Fund is authorized to reimburse specific expenses incurred in promoting the distribution of the
DISTRIBUTION           Fund's shares pursuant to a Plan of Distribution with the Distributor pursuant to Rule 12b-1  under
                       the  Investment  Company Act  of 1940.  Reimbursement may  in no  event exceed  an amount  equal to
                       payments at the annual rate of 0.15 of 1% of average daily net assets of the Fund (see page A-6).
------------------------------------------------------------------------------------------------------------------------
DIVIDENDS              Automatically reinvested daily in additional shares at net asset value (see page A-6).
------------------------------------------------------------------------------------------------------------------------
REPORTS                Individual monthly account statements  from Dean Witter on  the Dean Witter Transaction  Statement;
                       annual and semi-annual Trust financial statements.
------------------------------------------------------------------------------------------------------------------------
REDEMPTION             For  participants in the Active Assets  program, shares of the Money  Trust will be redeemed at net
OF SHARES              asset value automatically to satisfy debit balances  in the Securities Account created by  activity
                       therein  or to satisfy amounts owing  in the Visa Account resulting  from Visa card purchases, cash
                       advances or checks written against the Visa Account. Non-participants in the Active Assets  program
                       should  refer to the discussion appearing  at page A-4. It is  anticipated that the net asset value
                       will remain constant at  $1.00 per share. Dean  Witter has the right  to terminate a  shareholder's
                       Active  Assets service, in  which event all  Trust shares held  in a shareholder's  account will be
                       involuntarily redeemed. The Trust  also reserves the right  to reduce the number  of shares in  all
                       accounts  if the Trustees determine that this is necessary to maintain the constant $1.00 per share
                       net asset value. See "Purchase and Redemption of Shares" (page A-1).
------------------------------------------------------------------------------------------------------------------------
RISKS                  The Trust's investments are limited to U.S. Government securities, high grade corporate obligations
                       and obligations of banks and savings and loan associations having assets of $1 billion or more  and
                       fully  insured Certificates  of Deposit;  consequently, the portfolio  securities of  the Trust are
                       subject to minimal risk of loss of income  and principal. However, the investor is directed to  the
                       discussion  of "Repurchase Agreements" (page 4) concerning the risks associated with such portfolio
                       securities and management techniques.
------------------------------------------------------------------------------------------------------------------------
    THE SUMMARY INFORMATION ABOVE SHOULD BE READ IN CONJUNCTION WITH THE DETAILED INFORMATION APPEARING ELSEWHERE IN  THIS
PROSPECTUS,  INCLUDING THE APPENDIX HERETO, IN THE DEAN WITTER CLIENT AGREEMENT AND IN THE TRUST'S STATEMENT OF ADDITIONAL
INFORMATION, INCLUDING THE APPENDIX THERETO.
</TABLE>
    

                                       2
                           ACTIVE ASSETS MONEY TRUST
<PAGE>
SUMMARY OF TRUST EXPENSES
--------------------------------------------------------------------------------

    The  following table illustrates all expenses and fees that a shareholder of
the Trust will incur. The expenses and fees  set forth in the table are for  the
fiscal year ended June 30, 1995.

<TABLE>
<S>                                            <C>
SHAREHOLDER TRANSACTION EXPENSES
Maximum Sales Charge Imposed on Purchases....  None
Maximum Sales Charge Imposed on Reinvested
 Dividends...................................  None
Deferred Sales Charge........................  None
Redemption Fees..............................  None
Exchange Fee.................................  None
ANNUAL TRUST OPERATING EXPENSES (AS A
 PERCENTAGE OF AVERAGE NET ASSETS)
Management Fees..............................   0.32%
12b-1 Fees...................................   0.10%
Other Expenses...............................   0.07%
                                               ------
Total Trust Operating Expenses...............   0.49%
                                               ------
                                               ------
</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:                                                     $5        $16        $27        $62
</TABLE>

    Dean Witter charges an annual Active Assets program participation fee of $80
($100 for corporate participants). Shareholders of the Trust who are not program
participants will not be charged an Active Assets program fee.

    The  above  example should  not be  considered a  representation of  past or
future expenses or performance. Actual expenses  of the Trust 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 Trust will bear directly  or
indirectly.  For a  more complete description  of these costs  and expenses, see
pages A-5 and A-6 in the Appendix to this Prospectus.

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  and notes thereto and  the report of independent
accountants which are contained in the Statement of Additional Information.
    

<TABLE>
<CAPTION>
                                                                   FOR THE YEAR ENDED JUNE 30,
                                -------------------------------------------------------------------------------------------------
                                 1995      1994      1993      1992      1991      1990      1989      1988      1987      1986
                                -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
<S>                             <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
PER SHARE OPERATING
 PERFORMANCE:
Net asset value, beginning of
 period.......................  $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00
                                -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
Net investment income.........   0.051     0.029     0.029     0.045     0.068     0.081     0.083     0.066     0.058     0.072
Less dividends from net
 investment income............  (0.051)   (0.029)   (0.029)   (0.045)   (0.068)   (0.081)   (0.083)   (0.066)   (0.058)   (0.072)
                                -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
Net asset value, end of
 period.......................  $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00
                                -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
                                -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
TOTAL INVESTMENT RETURN.......    5.23%     2.99%     2.95%     4.58%     7.05%     8.43%     8.57%     6.83%     5.90%     7.51%
RATIOS TO AVERAGE NET ASSETS:
  Expenses....................    0.49%     0.51%     0.51%     0.54%     0.52%     0.50%     0.52%     0.54%     0.54%     0.56%
  Net investment income.......    5.16%     2.95%     2.90%     4.45%     6.80%     8.10%     8.33%     6.63%     5.78%     7.23%
SUPPLEMENTAL DATA:
Net assets, end of period, in
 millions.....................  $5,709    $4,144    $3,604    $3,628    $3,688    $3,454    $3,021    $2,519    $2,299    $2,240
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS

                                       3
                           ACTIVE ASSETS MONEY TRUST
<PAGE>
INVESTMENT OBJECTIVES AND POLICIES
--------------------------------------------------------------------------------

    THE INVESTMENT OBJECTIVES OF THE TRUST ARE HIGH CURRENT INCOME, PRESERVATION
OF  CAPITAL  AND  LIQUIDITY. THE  TRUST  SEEKS  TO ACHIEVE  THOSE  OBJECTIVES BY
INVESTING IN THE FOLLOWING MONEY MARKET INSTRUMENTS:

U.S. GOVERNMENT SECURITIES--

obligations issued or  guaranteed as  to principal  and interest  by the  United
States  or its agencies  (such as the  Export-Import Bank of  the United States,
Federal Housing Administration, and Government National Mortgage Association) or
its instrumentalities (such as the Federal Home Loan Bank, Federal  Intermediate
Credit  Banks and  Federal Land  Bank), including  Treasury bills,  notes, bonds
(including zero coupon bonds) and coupons;

BANK OBLIGATIONS--

obligations (including certificates  of deposit, bankers'  acceptances and  bank
notes)  of banks subject to  regulation by the U.S.  Government and having total
assets of $1,000,000,000 or more,  and instruments secured by such  obligations,
including  obligations of  foreign branches  of domestic  banks (because  of its
relationship  to  the  Active  Assets  program,  the  Trust  will  not  purchase
securities  of Bank One, Columbus, N.A. or its affiliates and will not deal with
such Bank  or  its  affiliates as  a  principal  in the  purchase  and  sale  of
securities);

OBLIGATIONS OF SAVINGS INSTITUTIONS--

certificates  of deposit  of savings  banks and  savings and  loan associations,
having total assets of $1,000,000,000 or more;

FULLY INSURED CERTIFICATES OF DEPOSIT--

certificates of deposit of banks  and savings institutions, having total  assets
of  less  than $1,000,000,000,  if  the principal  amount  of the  obligation is
insured by the FDIC, limited to $100,000 principal amount per certificate and to
10% or  less of  the Trust's  total assets  in all  such obligations  or in  all
illiquid assets, in the aggregate;

COMMERCIAL PAPER--

commercial  paper  rated within  the  two highest  grades  by Standard  & Poor's
Corporation ("S&P") or  the highest  grade by Moody's  Investors Service,  Inc.,
("Moody's")  or, if not  rated, issued by  a company having  an outstanding debt
issue rated at least AA by S&P or Aa by Moody's;

CORPORATE OBLIGATIONS--

corporate obligations, rated at least A by S&P or Moody's, maturing in one  year
or less.

    See  the  Appendix  to  the  Statement  of  Additional  Information  for  an
explanation of S&P and Moody's ratings.

REPURCHASE AGREEMENTS--

    The Trust may  enter into repurchase  agreements, which may  be viewed as  a
type  of  secured  lending  by  the  Trust,  and  which  typically  involve  the
acquisition by the Trust of debt securities from a selling financial institution
such as a  bank, savings and  loan association or  broker-dealer. The  agreement
provides  that  the  Trust will  sell  back  to the  institution,  and  that the
institution  will  repurchase,  the  underlying  security  ("collateral")  at  a
specified  price  and at  a  fixed time  in the  future.  The Trust  will accrue
interest from the institution  until the time when  the repurchase is to  occur.
Although  such  date  is deemed  by  the Trust  to  be  the maturity  date  of a
repurchase  agreement,  the  maturities  of  securities  subject  to  repurchase
agreements  are not subject to any limits  and may exceed thirteen months. While
repurchase  agreements  involve  certain   risks  not  associated  with   direct
investments  in  debt  securities,  the  Trust  follows  procedures  designed to
minimize such risks. These procedures include effecting repurchase  transactions
only  with large,  well-capitalized and  well-established financial institutions
and specifying the required value of the collateral underlying the agreement.

    The investment  objectives and  policies  stated above  may not  be  changed
without  shareholder approval. There is no assurance that the Trust's objectives
will be achieved.

PORTFOLIO MANAGEMENT--

    Although the  Trust  will  generally not  seek  profits  through  short-term
trading,  it may dispose of any portfolio  security prior to its maturity if, on
the basis of a revised credit evaluation of the issuer or other circumstances or
considerations, it believes such disposition advisable.

                                       4
                           ACTIVE ASSETS MONEY TRUST
<PAGE>
    The Trust is expected  to have a  high portfolio turnover  due to the  short
maturities  of securities  purchased, but this  should not affect  income or net
asset value as brokerage commissions are not normally charged on the purchase or
sale of money market instruments.

    The Trust will  attempt to balance  its objectives of  high current  income,
capital  preservation  and  liquidity  by  investing  in  securities  of varying
maturities and risks.  The Trust will  not, however, invest  in securities  that
mature in more than one year from the date of purchase.

    VARIABLE  RATE  AND  FLOATING  RATE OBLIGATIONS.  Certain  of  the  types of
investments described above may be  variable rate or floating rate  obligations.
The interest rates payable on variable rate or floating rate obligations are not
fixed  and may fluctuate based  upon changes in market  rates. The interest rate
payable on a variable  rate obligation may be  adjusted either at  predesignated
periodic  intervals and on a floating rate obligation whenever there is a change
in the market rate of interest on which the interest rate payable is based.

    BROKERAGE ALLOCATION.  Brokerage commissions are not normally charged on the
purchase or sale of money market instruments, but such transactions may  involve
transaction  costs in the form of spreads between bid and asked prices. Although
the Trust is expected to  have a high portfolio turnover  rate due to the  short
maturities  of its  portfolio securities,  the Trust's  income or  the net asset
value of  its shares  should not  be affected  as brokers'  commissions are  not
normally  incurred.  Pursuant  to  an  order  of  the  Securities  and  Exchange
Commission, the Trust may effect principal transactions in certain money  market
instruments  with  Dean  Witter.  In addition,  the  Trust  may  incur brokerage
commissions on transactions conducted through Dean Witter.

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

    The investment restrictions  listed below  are among  the restrictions  that
have  been  adopted by  the  Trust as  fundamental  policies. Under  the  Act, a
fundamental policy may  not be changed  without the  vote of a  majority of  the
outstanding voting securities of the Trust, as defined in the Act.

    These restrictions provide that the Trust may not:

    1.   Borrow  money, except from  banks for temporary  or emergency purposes,
including the meeting of redemption  requests which might otherwise require  the
untimely  disposition of securities.  Borrowing in the  aggregate may not exceed
20%, and borrowing for purposes other than meeting redemptions may not exceed 5%
of the value of the Trust's  total assets (including the amount borrowed),  less
liabilities  (not including  the amount borrowed)  at the time  the borrowing is
made;

    2.  Purchase securities of any issuer, except for securities issued by  U.S.
Government  agencies  or  instrumentalities,  having  a  record,  together  with
predecessors, of less  than three years'  continuous operation, if,  immediately
after such purchase, more than 5% of the value of the Trust's total assets would
be invested in such securities;

    3.   Purchase any securities, other than obligations of the U.S. Government,
or its agencies or instrumentalities, if, immediately after such purchase,  more
than 5% of the value of the Trust's total assets would be invested in securities
of  any one issuer, or more than 10% of the outstanding securities of one issuer
would be owned  by the Trust  (for this  purpose all indebtedness  of an  issuer
shall be deemed a single class of security); and

    4.   Purchase any securities, other than obligations of banks or of the U.S.
Government, or its  agencies or  instrumentalities, if,  immediately after  such
purchase,  more  than 25%  of the  value of  the Trust's  total assets  would be
invested in the securities of issuers in the same industry; however, there is no
limitation as to  investments in bank  obligations or in  obligations issued  or
guaranteed by the Federal Government or its agencies or instrumentalities.

    If a percentage restriction is adhered to at the time of investment, a later
increase  or  decrease  in  percentage  resulting from  a  change  in  values of
portfolio securities or amount of total or  net assets will not be considered  a
violation of any of the foregoing restrictions.

                                       5
                           ACTIVE ASSETS MONEY TRUST
<PAGE>
                          ACTIVE ASSETS TAX-FREE TRUST
       TWO WORLD TRADE CENTER, NEW YORK, NEW YORK 10048 - (212) 392-5000

    Active  Assets Tax-Free  Trust (the  "Tax-Free Trust"  or the  "Trust") is a
no-load, diversified  open-end  management  investment  company.  The  Trust  is
authorized  to  reimburse Dean  Witter Distributors  Inc. for  specific expenses
incurred in promoting the distribution of the Trust's shares pursuant to a  Plan
of Distribution pursuant to Rule 12b-1 under the Investment Company Act of 1940,
as  amended (the "Act"). Reimbursement may in no event exceed an amount equal to
payments at the  annual rate of  0.15% of the  average daily net  assets of  the
Trust.

    The investment objective of the Tax-Free Trust is to provide as high a level
of  daily income exempt from  federal personal income tax  as is consistent with
stability of principal and liquidity. The  Trust seeks to achieve its  objective
by  investing primarily in  high quality, tax-exempt  securities with short-term
maturities including Municipal Bonds,  Municipal Notes and Municipal  Commercial
Paper.

    AN  INVESTMENT IN THE  TRUST IS NEITHER  INSURED NOR GUARANTEED  BY THE U.S.
GOVERNMENT. THERE IS  NO ASSURANCE THAT  THE TRUST  WILL BE ABLE  TO MAINTAIN  A
STABLE NET ASSET VALUE OF $1.00 PER SHARE.

    SHARES  OF THE TRUST  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.
                               TABLE OF CONTENTS

<TABLE>
<S>                                                 <C>
Highlights/2                                        How Net Asset Value is Determined/A-4
Summary of Trust Expenses/3                         Confirmations/A-5
Financial Highlights/3                              The Trusts and Their Management/A-5
Investment Objective and Policies/4                 Plan of Distribution/A-6
Investment Restrictions/7                           Dividends, Distributions and Taxes/A-6
Purchase and Redemption of Shares/A-1               General Information/A-9
    Purchase of Shares/A-1                          Voting Rights/A-9
    Purchase of Shares by Non-Participants in       Custodian/A-10
     the Active Assets Program/A-2                  Shareholder Inquiries/A-10
    Redemption of Shares/A-3
    Redemption of Shares by Non-Participants in
    the Active Assets Program/A-4
</TABLE>

    THIS  PROSPECTUS SETS FORTH CONCISELY THE INFORMATION YOU SHOULD KNOW BEFORE
INVESTING IN THE  TRUST. IT SHOULD  BE READ AND  RETAINED FOR FUTURE  REFERENCE.
ADDITIONAL  INFORMATION  ABOUT  THE  TRUST  IS  CONTAINED  IN  THE  STATEMENT OF
ADDITIONAL INFORMATION, DATED  AUGUST 29, 1995,  WHICH HAS BEEN  FILED WITH  THE
SECURITIES  AND EXCHANGE  COMMISSION, AND WHICH  IS AVAILABLE AT  NO CHARGE UPON
REQUEST OF THE  TRUST AT  THE ADDRESS  LISTED ABOVE  OR BY  CALLING DEAN  WITTER
INTERCAPITAL   INC.  (THE  "INVESTMENT  MANAGER"  OR  "INTERCAPITAL")  AT  (212)
392-2550. THE  STATEMENT OF  ADDITIONAL INFORMATION  IS INCORPORATED  HEREIN  BY
REFERENCE.

    THE  INFORMATION IN THIS  PROSPECTUS SHOULD BE READ  IN CONJUNCTION WITH THE
INFORMATION APPEARING ELSEWHERE IN THIS DOCUMENT, INCLUDING THE APPENDIX HERETO,
WHICH IS PART OF THIS PROSPECTUS, AND IN THE DEAN WITTER CLIENT AGREEMENT.

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.
                            ------------------------

                THE DATE OF THIS PROSPECTUS IS AUGUST 29, 1995.

                          ACTIVE ASSETS TAX-FREE TRUST
<PAGE>
HIGHLIGHTS

<TABLE>
<S>                    <C>
THE                    A  no-load, open-end diversified management investment  company investing principally in short-term
TRUST                  securities exempt  from federal  income  tax. The  Trust is  authorized  to reimburse  Dean  Witter
                       Distributors  Inc. for  specific expenses  incurred in  promoting the  distribution of  the Trust's
                       shares pursuant to a Plan of Distribution pursuant to Rule 12b-1 under the Act (See page A-6).  The
                       Trust  is organized as an unincorporated business trust  under the laws of Massachusetts. (See page
                       A-5).
------------------------------------------------------------------------------------------------------------------------
SHARES                 The shares of the Tax-Free Trust are offered  to participants in the Active Assets program of  Dean
OFFERED                Witter  and to non-participants who wish to invest directly in shares of the Trust. (See page A-2).
                       The primary components of the Active Assets program are the Securities Account, which is linked  to
                       the  Active Assets Insured Account,  the Active Assets Money Trust,  the Tax-Free Trust, the Active
                       Assets California Tax-Free Trust or the Active  Assets Government Securities Trust and to the  Visa
                       Account. See the Dean Witter Client Agreement for further information.
------------------------------------------------------------------------------------------------------------------------
PURCHASE               Pursuant to the Dean Witter Client Agreement between Dean Witter and the customer, free credit cash
OF SHARES              balances  will be automatically  invested daily in shares  of the Trust at  their current net asset
                       value without any sales charge. Dean Witter Distributors  Inc. is the Distributor of shares of  the
                       Trust.  Investments  in shares  are  made under  the  circumstances described  under  "Purchase and
                       Redemption of Shares" (see page A-1). Non-participants in the Active Assets program should refer to
                       the discussion appearing at page A-2.
------------------------------------------------------------------------------------------------------------------------
INVESTMENT             High level of daily  tax-exempt income consistent  with stability of  principal and liquidity  (see
OBJECTIVE              page 4). There can be no assurance that the Trust's investment objective will be achieved.
------------------------------------------------------------------------------------------------------------------------
INVESTMENT             A diversified portfolio of tax-exempt, fixed-income securities with short-term maturities (see page
POLICY                 4).
------------------------------------------------------------------------------------------------------------------------
INVESTMENT             Dean  Witter  InterCapital  Inc.,  the  Investment  Manager  of  the  Trust,  and  its wholly-owned
MANAGER                subsidiary, Dean Witter Services Company, Inc.,  serve in various investment management,  advisory,
                       management  and administrative  capacities to  ninety-four investment  companies with  assets under
                       management of approximately $73.2 billion at June 30, 1995 (see page A-5).
------------------------------------------------------------------------------------------------------------------------
MANAGEMENT             Monthly fee at an annual rate of 1/2 of 1% of average daily net assets, scaled down on assets  over
FEE                    $500 million (see page A-5).
------------------------------------------------------------------------------------------------------------------------
DISTRIBUTOR            Dean  Witter Distributors  Inc. (the "Distributor")  sells shares  of the Fund  through Dean Witter
                       Reynolds Inc.  Other  than  the  reimbursement  to the  Distributor  pursuant  to  the  Rule  12b-1
                       Distribution Plan, the Distributor receives no distribution fees (see page A-2).
------------------------------------------------------------------------------------------------------------------------
PLAN OF                The Fund is authorized to reimburse specific expenses incurred in promoting the distribution of the
DISTRIBUTION           Fund's  shares pursuant to a Plan of Distribution with the Distributor pursuant to Rule 12b-1 under
                       the Investment  Company Act  of 1940.  Reimbursement may  in no  event exceed  an amount  equal  to
                       payments at the annual rate of 0.15 of 1% of average daily net assets of the Fund (see page A-6).
------------------------------------------------------------------------------------------------------------------------
DIVIDENDS              Automatically reinvested daily in additional shares at net asset value (see page A-6).
------------------------------------------------------------------------------------------------------------------------
REPORTS                Individual  monthly account statements from  Dean Witter on the  Dean Witter Transaction Statement;
                       annual and semi-annual Trust financial statements.
------------------------------------------------------------------------------------------------------------------------
REDEMPTION             For participants in the Active Assets  program, shares of the Trust  will be redeemed at net  asset
OF SHARES              value automatically to satisfy debit balances in the Securities Account created by activity therein
                       or  to satisfy amounts owing in the Visa  Account resulting from Visa card purchases, cash advances
                       or checks written against the  Visa Account. Non-participants in  the Active Assets program  should
                       refer  to the discussion  appearing at page  A-4. It is  anticipated that the  net asset value will
                       remain constant at $1.00 per share. Dean Witter  has the right to terminate a shareholder's  Active
                       Assets  service,  in  which  event  all  Trust shares  held  in  a  shareholder's  account  will be
                       involuntarily redeemed. The Trust  also reserves the right  to reduce the number  of shares in  all
                       accounts  if the Trustees determine that this is necessary to maintain the constant $1.00 per share
                       net asset value. See "Purchase and Redemption of Shares" (page A-1).
------------------------------------------------------------------------------------------------------------------------
RISKS                  The Trust  invests  principally in  high  quality,  short-term fixed-income  securities  issued  or
                       guaranteed  by state and local governments which are subject  to minimal risk of loss of income and
                       principal. However, the investor is directed to the discussions of "lease obligations" (page 5) and
                       "When-Issued and Delayed Delivery  Securities" (page 6) concerning  the risks associated with  such
                       portfolio securities and management techniques.
------------------------------------------------------------------------------------------------------------------------
    THE  SUMMARY INFORMATION ABOVE SHOULD BE READ IN CONJUNCTION WITH THE DETAILED INFORMATION APPEARING ELSEWHERE IN THIS
PROSPECTUS, INCLUDING THE APPENDIX HERETO, IN THE DEAN WITTER CLIENT AGREEMENT AND IN THE TRUST'S STATEMENT OF  ADDITIONAL
INFORMATION, INCLUDING THE APPENDIX THERETO.
</TABLE>

                                       2

                          ACTIVE ASSETS TAX-FREE TRUST
<PAGE>
SUMMARY OF TRUST EXPENSES
--------------------------------------------------------------------------------

    The  following table illustrates all expenses and fees that a shareholder of
the Trust will incur. The expenses and fees  set forth in the table are for  the
fiscal year ended June 30, 1995.

<TABLE>
<S>                                       <C>
SHAREHOLDER TRANSACTION EXPENSES
Maximum Sales Charge Imposed on
 Purchases..............................    None
Maximum Sales Charge Imposed on
 Reinvested Dividends...................  None
Deferred Sales Charge...................  None
Redemption Fees.........................  None
Exchange Fee............................  None
ANNUAL TRUST OPERATING EXPENSES (AS A
 PERCENTAGE OF AVERAGE NET ASSETS)
Management Fees.........................    0.42%
12b-1 Fees..............................    0.10%
Other Expenses..........................    0.04%
                                          -------
Total Trust Operating Expenses..........    0.56%
                                          -------
                                          -------
</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:                   $ 6       $18       $31       $70
</TABLE>

    Dean Witter charges an annual Active Assets program participation fee of $80
($100 for corporate participants). Shareholders of the Trust who are not program
participants will not be charged an Active Assets program fee.

    The  above  example should  not be  considered a  representation of  past or
future expenses or performance. Actual expenses  of the Trust 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 Trust will bear directly  or
indirectly.  For a  more complete description  of these costs  and expenses, see
pages A-5 and A-6 in the Appendix to this Prospectus.

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  and notes thereto and  the report of independent
accountants which are contained in the Statement of Additional Information.
    

<TABLE>
<CAPTION>
                                                                   FOR THE YEAR ENDED JUNE 30,
                                -------------------------------------------------------------------------------------------------
                                 1995      1994      1993      1992      1991      1990      1989      1988      1987      1986
                                -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
<S>                             <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of
 period.......................  $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00
                                -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
Net investment income.........   0.030     0.020     0.021     0.033     0.047     0.054     0.056     0.043     0.039     0.046
Less dividends from net
 investment income............  (0.030)   (0.020)   (0.021)   (0.033)   (0.047)   (0.054)   (0.056)   (0.043)   (0.039)   (0.046)
                                -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
Net asset value, end of
 period.......................  $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00
                                -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
                                -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
TOTAL INVESTMENT RETURN.......    3.09%     2.01%     2.15%     3.38%     4.84%     5.57%     5.77%     4.45%     4.00%     4.75%
RATIOS TO AVERAGE NET ASSETS:
  Expenses....................    0.56%     0.56%     0.57%     0.59%     0.60%     0.56%     0.58%     0.57%     0.58%     0.62%
  Net investment income.......    3.05%     1.98%     2.13%     3.30%     4.71%     5.44%     5.66%     4.35%     3.89%     4.62%
SUPPLEMENTAL DATA:
Net assets, end of period, in
 millions.....................  $1,499    $1,416    $1,355    $1,304    $1,342    $1,174    $1,112    $1,034    $1,045    $  952
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS

                                       3
                          ACTIVE ASSETS TAX-FREE TRUST
<PAGE>
INVESTMENT OBJECTIVE AND POLICIES
--------------------------------------------------------------------------------

    THE INVESTMENT OBJECTIVE OF THE TRUST IS TO PROVIDE AS HIGH A LEVEL OF DAILY
INCOME  EXEMPT FROM FEDERAL PERSONAL INCOME  TAX AS IS CONSISTENT WITH STABILITY
OF PRINCIPAL AND  LIQUIDITY. It is  a fundamental  policy of the  Trust that  at
least  80% of its  total assets will  be invested in  securities the interest on
which is exempt from federal personal income tax ("tax-exempt securities"). This
policy and the Trust's investment objective may not be changed without a vote of
a majority of the Trust's outstanding voting securities (as defined in the Act).
There is no assurance that the objective will be achieved.

    The Trust seeks to achieve  its investment objective by investing  primarily
in   high  quality  tax-exempt  securities   with  short-term  maturities.  Such
securities  will  include  Municipal   Bonds,  Municipal  Notes  and   Municipal
Commercial Paper ("Municipal Obligations") with maturities of thirteen months or
less,  which are  rated in  one of  the two  highest rating  categories for debt
obligations  by   at  least   two  nationally   recognized  statistical   rating
organizations  ("NRSROs" -- primarily Moody's  Investors Service ("Moody's") and
Standard & Poor's Corporation ("S&P")), or one NRSRO if the obligation is  rated
by  only one NRSRO. Unrated obligations may  be purchased if they are determined
to be of comparable quality by the Trust's Trustees.

    Municipal Bonds and Municipal Notes 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.

    The Trust  may purchase  certain Municipal  Obligations which  have a  final
maturity of more than thirteen months but which are subject to short-term demand
features  or tenders prior to final maturity, either determined by the issuer or
selected at  the  holder's  option.  The former  are  commonly  referred  to  as
"variable  rate" obligations (see below) and  the latter as municipal commercial
paper. The  Trust may  purchase Municipal  Bonds and  Notes if  they are  within
either  the short-term or long-term rating  levels set forth above for Municipal
Obligations.

    See  the  Appendix  to  the  Statement  of  Additional  Information  for  an
explanation of Moody's and S&P ratings.

    Any  municipal  obligation  which  depends  on  the  credit  of  the Federal
Government shall be considered to have a rating in the highest category.

    Up to 20%  of the Trust's  total assets  may be invested  in securities  the
interest  on  which is  not exempt  from federal  personal income  tax ("taxable
securities") and in  tax-exempt securities  subject to  the federal  alternative
minimum  tax for individual ("AMT") (tax-exempt  securities which are subject to
the AMT will not be included in  the 80% total referred to above for  investment
in tax-exempt securities).

    Up  to 20% of the Trust's total assets may be invested in taxable securities
of the type described below. The Trust  may temporarily invest more than 20%  in
taxable  securities  and  tax-exempt securities  subject  to AMT  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  Trust  may  invest  are  limited  to  the  following short-term,
fixed-income securities (maturing in  thirteen months or less  from the time  of
purchase):  (i) obligations  of the  United States  Government or  its agencies,
instrumentalities or  authorities;  (ii) prime  commercial  paper rated  P-1  by
Moody's or A-1 by S&P; (iii) certificates of deposit and banker's acceptances of
domestic banks with assets of $1 billion or more; and (iv) repurchase agreements
with respect to any of the foregoing portfolio securities.

                                       4
                          ACTIVE ASSETS TAX-FREE TRUST
<PAGE>
    The foregoing percentage and rating limita-
tions  apply at the time of acquisition of a security based on the last previous
determination of  the Trust's  net asset  value. Any  subsequent change  in  any
rating  by  a rating  service  or change  in  percentages resulting  from market
fluctuations or amount of total or net assets may not require elimination of any
security from the Trust's portfolio.

    The ratings assigned by NRSROs represent their opinions as to the quality of
the securities which they undertake to  rate. It should be emphasized,  however,
that  the ratings are general and not absolute standards of quality. However, in
accordance with procedures adopted by  the Trust's Trustees pursuant to  federal
securities regulations governing money market funds, the Investment Manager will
perform  a  creditworthiness  analysis  of  such  downgraded  securities,  which
analysis will be reported to the  Trustees who will, in turn, determine  whether
the securities continue to present minimal credit risks to the Trust.

    The  two  principal classifications  of  Municipal Obligations  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.

    Included within  the  revenue bonds  category  are participations  in  lease
obligations  or installment purchase  contracts (hereinafter collectively called
"lease obligations") of municipalities. State and local agencies or  authorities
issue lease obligations to acquire equipment and facilities.

    Lease  obligations  may  have  risks not  normally  associated  with general
obligation  or  other  revenue  bonds.  Leases,  and  installment  purchase   or
conditional  sale contracts (which may provide for  title to the leased asset to
pass eventually  to the  issuer), have  developed as  a means  for  governmental
issuers  to acquire  property and equipment  without the  necessity of complying
with the constitutional and statutory requirements generally applicable for  the
issuance  of debt. Certain lease obligations contain "non-appropriation" clauses
that provide  that the  governmental issuer  has no  obligation to  make  future
payments  under  the lease  or contract  unless money  is appropriated  for such
purpose by  the appropriate  legislative body  on an  annual or  other  periodic
basis.  Consequently,  continued  lease  payments  on  those  lease  obligations
containing "non-appropriation"  clauses  are  dependent  on  future  legislative
actions.  If such  legislative actions  do not occur,  the holders  of the lease
obligation may  experience  difficulty  in exercising  their  rights,  including
disposition of the property.

    In  addition, lease obligations represent a relatively new type of financing
that has  not yet  developed 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 Trust will consider such securities to be

                                       5
                          ACTIVE ASSETS TAX-FREE TRUST
<PAGE>
illiquid  (the Trust may not  invest more than ten percent  of its net assets in
illiquid securities), the Trustees of  the Trust have established guidelines  to
be utilized by the Trust 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.  All  lease obligations  purchased  by the  Trust  are subject  to the
creditworthiness standards discussed above for Municipal Obligations.

    The Trust does not  generally intend to  invest more than  25% of its  total
assets  in securities of governmental units located in any one state, territory,
or possession of the United  States. The Trust 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 Trust 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  high quality,  short-term fixed  income securities  in which  the Trust
principally invests are issued and/or guaranteed by state and local  governments
and  their agencies and authorities  and are subject to  minimal risk of loss of
income and principal.

PORTFOLIO MANAGEMENT

    Although the Trust will generally acquire
securities for investment with the intent  of holding them to maturity and  will
not  seek  profits through  short-term  trading, the  Trust  may dispose  of any
security prior to its maturity to meet redemption requests. Securities may  also
be  sold when  the Trust's  Investment Manager  believes such  disposition to be
advisable on the  basis of  a revised  evaluation of  the issuer  or based  upon
relevant  market considerations.  There may  be occasions  when, as  a result of
maturities of portfolio securities or sales of Trust shares, or in order to meet
anticipated redemption requests, the  Trust may hold cash  which is not  earning
income.

    The  average weighted maturity of the portfolio will be 90 days or less. The
relatively short-term nature of the Trust  portfolio is expected to result in  a
lower yield than portfolios comprised of longer-term tax-exempt securities.

    VARIABLE  RATE AND FLOATING RATE OBLIGATIONS.  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" or "floating rate" obligations. The interest rate payable
on a variable rate  obligation is adjusted  at predesignated periodic  intervals
and on a floating rate obligation, 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.  The  Trust  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 Trust makes the commitment to
purchase such securities, it will record the transaction and thereafter  reflect
the value, each day, of such security in determining its net asset value.

    BROKERAGE  ALLOCATION.   Brokerage commissions  are not  normally charged on
purchases and sales of short-term  municipal obligations, but such  transactions
may  involve transaction  costs in  the form  of spreads  between bid  and asked
prices. Pursuant to  an order  of the  Securities and  Exchange Commission,  the
Trust may effect principal transactions in

                                       6
                          ACTIVE ASSETS TAX-FREE TRUST
<PAGE>
certain  money market instruments  with Dean Witter. In  addition, the Trust may
incur brokerage commissions on transactions conducted through Dean Witter.

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

    The investment restrictions  listed below  are among  the restrictions  that
have  been  adopted by  the  Trust as  fundamental  policies. Under  the  Act, a
fundamental policy may  not be changed  without the  vote of a  majority of  the
outstanding  voting securities of the Trust, as defined in the Act. For purposes
of the following limitations: (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; (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 amount of total  or net assets does  not require elimination of
any security from the portfolio.

    The Trust 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 of
    any one issuer;

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

        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; and

        5.  Borrow money, except from banks for temporary or emergency purposes,
    including  the meeting of redemption  requests which might otherwise require
    the untimely disposition of securities.  Borrowing in the aggregate may  not
    exceed  20%, and borrowing  for purposes other  than meeting redemptions may
    not exceed  5%, of  the value  of the  Trust's total  assets (including  the
    amount  borrowed), less liabilities  (not including the  amount borrowed) at
    the time the borrowing is made.

                                       7
                          ACTIVE ASSETS TAX-FREE TRUST
<PAGE>
                    ACTIVE ASSETS CALIFORNIA TAX-FREE TRUST

       TWO WORLD TRADE CENTER, NEW YORK, NEW YORK 10048 - (212) 392-5000

    Active  Assets California Tax-Free Trust (the "California Tax-Free Trust" or
the "Trust") is a no-load,  diversified open-end management investment  company.
The  Trust is authorized to reimburse Dean Witter Distributors Inc. for specific
expenses incurred in promoting the  distribution of the Trust's shares  pursuant
to  a Plan of Distribution  pursuant to Rule 12b-1  under the Investment Company
Act of 1940, as  amended (the "Act").  Reimbursement may in  no event exceed  an
amount  equal to payments at  the annual rate of 0.15%  of the average daily net
assets of the Trust.

    The investment objective of the Trust is to provide as high a level of daily
income exempt from federal and California  personal income tax as is  consistent
with  stability  of principal  and  liquidity. The  Trust  seeks to  achieve its
objective  by  investing  primarily  in  high  quality,  California   tax-exempt
securities with short-term maturities including Municipal Bonds, Municipal Notes
and Municipal Commercial Paper.

    AN  INVESTMENT IN THE  TRUST IS NEITHER  INSURED NOR GUARANTEED  BY THE U.S.
GOVERNMENT. THERE IS  NO ASSURANCE THAT  THE TRUST  WILL BE ABLE  TO MAINTAIN  A
STABLE NET ASSET VALUE OF $1.00 PER SHARE.

    SHARES  OF THE TRUST  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.
                               TABLE OF CONTENTS

<TABLE>
<S>                                                 <C>
Highlights/2                                        How Net Asset Value is Determined/A-4
Summary of Trust Expenses/3                         Confirmations/A-5
Financial Highlights/3                              The Trusts and Their Management/A-5
Investment Objective and Policies/4                 Plan of Distribution/A-6
Investment Restrictions/8                           Dividends, Distributions and Taxes/A-6
Purchase and Redemption of Shares/A-1               General Information/A-9
    Purchase of Shares/A-1                          Voting Rights/A-9
    Purchase of Shares by Non-Participants in       Custodian/A-10
     the Active Assets Program/A-2                  Shareholder Inquiries/A-10
    Redemption of Shares/A-3
    Redemption of Shares by Non-Participants in
    the Active Assets Program/A-4
</TABLE>

    THIS  PROSPECTUS SETS FORTH CONCISELY THE INFORMATION YOU SHOULD KNOW BEFORE
INVESTING IN THE  TRUST. IT SHOULD  BE READ AND  RETAINED FOR FUTURE  REFERENCE.
ADDITIONAL  INFORMATION  ABOUT  THE  TRUST  IS  CONTAINED  IN  THE  STATEMENT OF
ADDITIONAL INFORMATION, DATED  AUGUST 29, 1995,  WHICH HAS BEEN  FILED WITH  THE
SECURITIES  AND EXCHANGE  COMMISSION, AND WHICH  IS AVAILABLE AT  NO CHARGE UPON
REQUEST OF THE TRUST AT THE ADDRESS  LISTED ABOVE OR BY CALLING THE DEAN  WITTER
INTERCAPITAL   INC.  (THE  "INVESTMENT  MANAGER"  OR  "INTERCAPITAL")  AT  (212)
392-2550. THE  STATEMENT OF  ADDITIONAL INFORMATION  IS INCORPORATED  HEREIN  BY
REFERENCE.

    THE  INFORMATION IN THIS  PROSPECTUS SHOULD BE READ  IN CONJUNCTION WITH THE
INFORMATION APPEARING ELSEWHERE IN THIS DOCUMENT, INCLUDING THE APPENDIX HERETO,
WHICH IS PART OF THIS PROSPECTUS, AND IN THE DEAN WITTER CLIENT AGREEMENT.

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.
                            ------------------------

                THE DATE OF THIS PROSPECTUS IS AUGUST 29, 1995.

                    ACTIVE ASSETS CALIFORNIA TAX-FREE TRUST
<PAGE>
HIGHLIGHTS

<TABLE>
<S>                    <C>
THE                    A  no-load, open-end diversified management investment  company investing principally in short-term
TRUST                  securities exempt from  federal and  California personal  income tax.  The Trust  is authorized  to
                       reimburse   Dean  Witter  Distributors  Inc.  for  specific  expenses  incurred  in  promoting  the
                       distribution of the Trust's shares pursuant to a Plan of Distribution pursuant to Rule 12b-1  under
                       the  Act (See page A-6). The Trust is organized  as an unincorporated business trust under the laws
                       of Massachusetts. (See page A-5).
------------------------------------------------------------------------------------------------------------------------
SHARES                 The shares of the Trust are offered to participants in the Active Assets program of Dean Witter and
OFFERED                to non- participants  who wish  to invest  directly in shares  of the  Trust. (See  page A-2).  The
                       primary  components of the Active Assets program are the Securities Account, which is linked to the
                       Active Assets Insured Account, the Active Assets Money Trust, the Active Assets Tax-Free Trust, the
                       California Tax-Free Trust or the Active Assets Government Securities Trust and to the Visa Account.
                       See the Dean Witter Client Agreement for further information.
------------------------------------------------------------------------------------------------------------------------
PURCHASE               Pursuant to the Dean Witter Client Agreement between Dean Witter and the customer, free credit cash
OF SHARES              balances will be automatically  invested daily in shares  of the Trust at  their current net  asset
                       value  without any sales charge. Dean Witter Distributors  Inc. is the Distributor of shares of the
                       Trust. Investments  in  shares are  made  under the  circumstances  described under  "Purchase  and
                       Redemption of Shares" (see page A-1). Non-participants in the Active Assets program should refer to
                       the discussion appearing at page A-2.
------------------------------------------------------------------------------------------------------------------------
INVESTMENT             High  level  of daily  California  tax-exempt income  consistent  with stability  of  principal and
OBJECTIVE              liquidity (see page 4).  There can be no  assurance that the Trust's  investment objective will  be
                       achieved.
------------------------------------------------------------------------------------------------------------------------
INVESTMENT             A diversified portfolio of tax-exempt, fixed-income securities with short-term maturities (see page
POLICY                 4).
------------------------------------------------------------------------------------------------------------------------
INVESTMENT             Dean  Witter  InterCapital  Inc.,  the  Investment  Manager  of  the  Trust,  and  its wholly-owned
MANAGER                subsidiary, Dean Witter Services Company, Inc.,  serve in various investment management,  advisory,
                       management  and administrative  capacities to  ninety-four investment  companies with  assets under
                       management of approximately $73.2 billion at June 30, 1995 (see page A-5).
------------------------------------------------------------------------------------------------------------------------
MANAGEMENT             Monthly fee at an annual rate of 1/2 of 1% of average daily net assets, scaled down on assets  over
FEE                    $500 million (see page A-5).
------------------------------------------------------------------------------------------------------------------------
DIVIDENDS              Automatically reinvested daily in additional shares at net asset value (see page A-6).
------------------------------------------------------------------------------------------------------------------------
DISTRIBUTOR            Dean  Witter Distributors  Inc. (the "Distributor")  sells shares  of the Fund  through Dean Witter
                       Reynolds Inc.  Other  than  the  reimbursement  to the  Distributor  pursuant  to  the  Rule  12b-1
                       Distribution Plan, the Distributor receives no distribution fees (see page A-2).
------------------------------------------------------------------------------------------------------------------------
PLAN OF                The Fund is authorized to reimburse specific expenses incurred in promoting the distribution of the
DISTRIBUTION           Fund's  shares pursuant to a Plan of Distribution with the Distributor pursuant to Rule 12b-1 under
                       the Investment  Company Act  of 1940.  Reimbursement may  in no  event exceed  an amount  equal  to
                       payments at the annual rate of 0.15 of 1% of average daily net assets of the Fund (see page A-6).
------------------------------------------------------------------------------------------------------------------------
REPORTS                Individual  monthly account statements from  Dean Witter on the  Dean Witter Transaction Statement;
                       annual and semi-annual Trust financial statements.
------------------------------------------------------------------------------------------------------------------------
REDEMPTION             For participants in the Active Assets  program, shares of the Trust  will be redeemed at net  asset
OF SHARES              value automatically to satisfy debit balances in the Securities Account created by activity therein
                       or  to satisfy amounts owing in the Visa  Account resulting from Visa card purchases, cash advances
                       or checks written against the  Visa Account. Non-participants in  the Active Assets program  should
                       refer  to the discussion  appearing at page  A-4. It is  anticipated that the  net asset value will
                       remain constant at $1.00 per share. Dean Witter  has the right to terminate a shareholder's  Active
                       Assets  service,  in  which  event  all  Trust shares  held  in  a  shareholder's  account  will be
                       involuntarily redeemed. The Trust  also reserves the right  to reduce the number  of shares in  all
                       accounts  if the Trustees determine that this is necessary to maintain the constant $1.00 per share
                       net asset value. See "Purchase and Redemption of Shares" (page A-1).
------------------------------------------------------------------------------------------------------------------------
RISKS                  The Trust  invests  principally in  high  quality,  short-term fixed-income  securities  issued  or
                       guaranteed  by the state of California and its  local governments which are subject to minimal risk
                       of loss of income  and principal. However, the  investor is directed to  the discussions of  "lease
                       obligations"  (page 5) and  "When-Issued and Delayed  Delivery Securities" (page  6) concerning the
                       risks associated  with  such  portfolio  securities and  management  techniques.  Since  the  Trust
                       concentrates  its investments  in California  tax-exempt securities, the  Trust is  affected by any
                       political, economic or regulatory developments affecting  the ability of California issuers to  pay
                       interest or repay principal (page 6).
------------------------------------------------------------------------------------------------------------------------
    THE  SUMMARY INFORMATION ABOVE SHOULD BE READ IN CONJUNCTION WITH THE DETAILED INFORMATION APPEARING ELSEWHERE IN THIS
PROSPECTUS, INCLUDING THE APPENDIX HERETO, IN THE DEAN WITTER CLIENT AGREEMENT AND IN THE TRUST'S STATEMENT OF  ADDITIONAL
INFORMATION, INCLUDING THE APPENDIX THERETO.
</TABLE>

                                       2

                    ACTIVE ASSETS CALIFORNIA TAX-FREE TRUST
<PAGE>
SUMMARY OF TRUST EXPENSES
--------------------------------------------------------------------------------

    The  following table illustrates all expenses and fees that a shareholder of
the Trust will incur. The expenses and fees  set forth in the table are for  the
fiscal year ended June 30, 1995.

<TABLE>
<S>                                       <C>
SHAREHOLDER TRANSACTION EXPENSES
Maximum Sales Charge Imposed on
 Purchases..............................    None
Maximum Sales Charge Imposed on
 Reinvested Dividends...................  None
Deferred Sales Charge...................  None
Redemption Fees.........................  None
Exchange Fee............................  None
ANNUAL TRUST OPERATING EXPENSES (AS A
 PERCENTAGE OF AVERAGE NET ASSETS)
Management Fees.........................    0.50%
12b-1 Fees..............................    0.10%
Other Expenses..........................    0.07%
                                          -------
Total Trust Operating Expenses..........    0.67%
                                          -------
                                          -------
</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:              $ 7       $21       $37       $83
</TABLE>

    Dean Witter charges an annual Active Assets program participation fee of $80
($100 for corporate participants). Shareholders of the Trust who are not program
participants will not be charged an Active Assets program fee.

    The  above  example should  not be  considered a  representation of  past or
future expenses or performance. Actual expenses  of the Trust 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 Trust will bear directly  or
indirectly.  For a  more complete description  of these costs  and expenses, see
pages A-5 and A-6 in the Appendix to this Prospectus.

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  and notes thereto and  the report of independent
accountants which are contained in the Statement of Additional Information.
    

<TABLE>
<CAPTION>
                                                                                     FOR THE PERIOD
                                              FOR THE YEAR ENDED JUNE 30,          NOVEMBER 12, 1991*
                                          ------------------------------------          THROUGH
                                             1995         1994         1993          JUNE 30, 1992
                                          ----------   ----------   ----------   ----------------------
<S>                                       <C>          <C>          <C>          <C>
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period....  $   1.00     $   1.00     $   1.00            $  1.00
                                             -----        -----        -----              -----
Net investment income...................     0.029        0.018        0.018              0.017
Less dividends from net investment
 income.................................    (0.029)      (0.018)      (0.018)            (0.017)
                                             -----        -----        -----              -----
Net asset value, end of period..........  $   1.00     $   1.00     $   1.00            $  1.00
                                             -----        -----        -----              -----
                                             -----        -----        -----              -----
TOTAL INVESTMENT RETURN.................      2.89%        1.78%        1.84%              1.66%(1)
RATIOS TO AVERAGE NET ASSETS:
  Expenses..............................      0.67%        0.68%        0.71%              0.56%(2)(3)
  Net investment income.................      2.86%        1.77%        1.82%              2.42%(2)(3)
SUPPLEMENTAL DATA:
Net assets, end of period, in
 thousands..............................  $313,566     $288,506     $202,149           $170,364
<FN>
-----------------
 * COMMENCEMENT OF OPERATIONS.
(1) NOT ANNUALIZED.
(2) ANNUALIZED.
(3) IF THE  TRUST HAD  BORNE ALL  EXPENSES THAT WERE  ASSUMED OR  WAIVED BY  THE
    INVESTMENT  MANAGER, THE ABOVE ANNUALIZED  EXPENSE AND NET INVESTMENT INCOME
    RATIOS WOULD HAVE BEEN 0.80% AND 2.18%, RESPECTIVELY.
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS

                                       3
                    ACTIVE ASSETS CALIFORNIA TAX-FREE TRUST
<PAGE>
INVESTMENT OBJECTIVE AND POLICIES
--------------------------------------------------------------------------------

    THE INVESTMENT OBJECTIVE OF THE TRUST IS TO PROVIDE AS HIGH A LEVEL OF DAILY
INCOME  EXEMPT FROM FEDERAL AND CALIFORNIA  PERSONAL INCOME TAX AS IS CONSISTENT
WITH STABILITY OF  PRINCIPAL AND LIQUIDITY.  It is a  fundamental policy of  the
Trust  that at least 80% of its total  assets will be invested in securities the
interest on which  is exempt  from federal  and California  personal income  tax
("California  tax-exempt securities").  This policy  and the  Trust's investment
objective may  not be  changed  without a  vote of  a  majority of  the  Trust's
outstanding voting securities, as defined in the Act. There is no assurance that
the objective will be achieved.

    The  Trust seeks to achieve its  investment objective by investing primarily
in  high  quality  tax-exempt   securities  with  short-term  maturities.   Such
securities  will include California Municipal  Bonds, California Municipal Notes
and  California  Municipal  Commercial  Paper  ("Municipal  Obligations")   with
maturities of thirteen months or less, which are rated in one of the two highest
rating  categories for  debt obligations by  at least  two nationally recognized
statistical  rating  organizations  ("NRSRO's"--  primarily  Moody's   Investors
Service  ("Moody's") and Standard & Poor's Corporation ("S&P")), or one NRSRO if
the obligation is rated by only one NRSRO. Unrated obligations may be  purchased
if they are determined to be of comparable quality by the Trust's Trustees.

    Up  to 20% of  the Trust's total  assets may also  be invested in securities
exempt from federal personal income tax but not from California personal  income
tax  ("non-California  tax-exempt  securities"), in  taxable  securities  and in
tax-exempt securities  subject  to  the  federal  alternative  minimum  tax  for
individual shareholders ("AMT") (California tax-exempt securities subject to AMT
will  not  be included  in the  80% total  referred to  above for  investment in
California tax-exempt securities). In addition, the Trust may temporarily invest
more than  20%  of  its  total  assets  in  taxable  securities,  non-California
tax-exempt securities, or in tax-exempt securities subject to AMT, 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  Trust  may  temporarily  invest  are  limited  to  the  following
short-term fixed-income securities (maturing in thirteen months or less from the
time  of  purchase); (i)  obligations  of the  United  States Government  or 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.

    California  Municipal  Bonds  and   California  Municipal  Notes  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). California Municipal
Commercial  Paper  refers  to  short-term  obligations  of  municipalities.  Any
Municipal  Obligation which depends on the credit of the Federal Government, its
agencies or instrumentalities shall  be considered to have  a Moody's rating  of
Aaa  or  S&P  rating of  AAA.  An  obligation shall  be  considered  a Municipal
Obligation only  if,  in the  opinion  of  bond counsel,  the  interest  payable
therefrom  is exempt from both federal income tax and California personal income
tax.

    The foregoing  percentage  and  rating  limitations apply  at  the  time  of
acquisition  of  a security  based  on the  last  previous determination  of the
Trust's net asset value. Any subsequent change in any rating by a rating service
or change  in percentages  resulting from  market fluctuations  may not  require
elimination  of any security from the  Trust's portfolio. However, in accordance
with procedures adopted by the  Trust's Trustees pursuant to federal  securities
regulations  governing money market funds, the Investment Manager will perform a

                                       4
                    ACTIVE ASSETS CALIFORNIA TAX-FREE TRUST
<PAGE>
creditworthiness analysis of such downgraded securities, which analysis will  be
reported  to the  Trustees who will,  in turn, determine  whether the securities
continue to  present minimal  credit risks  to  the Trust.  The Trust  does  not
anticipate that more than 5% of its net assets are likely to be downgraded below
the rating requirements described above for Municipal Obligations.

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

    The two  principal classifications  of  Municipal Obligations  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.

    Included  within  the revenue  bonds  category are  participations  in lease
obligations or installment purchase  contracts (hereinafter collectively  called
"lease  obligations") of municipalities. State and local agencies or authorities
issue lease obligations to acquire equipment and facilities.

    Lease obligations  may  have  risks not  normally  associated  with  general
obligation   or  other  revenue  bonds.  Leases,  and  installment  purchase  or
conditional sale contracts (which may provide  for title to the leased asset  to
pass  eventually  to the  issuer), have  developed as  a means  for governmental
issuers to acquire  property and  equipment without the  necessity of  complying
with  the constitutional and statutory requirements generally applicable for the
issuance of debt. Certain lease obligations contain "non-appropriation"  clauses
that  provide  that the  governmental issuer  has no  obligation to  make future
payments under  the lease  or contract  unless money  is appropriated  for  such
purpose  by  the appropriate  legislative body  on an  annual or  other periodic
basis.  Consequently,  continued  lease  payments  on  those  lease  obligations
containing  "non-appropriation"  clauses  are  dependent  on  future legislative
actions. If such  legislative actions  do not occur,  the holders  of the  lease
obligation  may  experience  difficulty in  exercising  their  rights, including
disposition of the property.

    In addition, lease obligations represent a relatively new type of  financing
that  has  not yet  developed 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 Trust will consider such securities to be illiquid (the Trust may not invest
more than ten percent of its net assets in illiquid securities), the Trustees of
the Trust have established guidelines to be utilized by the Trust 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
obliga-

                                       5
                    ACTIVE ASSETS CALIFORNIA TAX-FREE TRUST
<PAGE>
tion; 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. All  lease obligations purchased by
the Trust  are subject  to the  creditworthiness standards  discussed above  for
Municipal Obligations.

    The  Trust does not  generally intend to  invest more than  25% of its total
assets in securities  of any one  governmental unit. The  Trust 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 will be additional  risk to the Trust  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.

PORTFOLIO MANAGEMENT

    Although the Trust will generally acquire securities for investment with the
intent of holding them to maturity and will not seek profits through  short-term
trading,  the Trust may  dispose of any  security prior to  its maturity to meet
redemption requests. Securities  may also  be sold when  the Trust's  Investment
Manager  believes such  disposition to  be advisable on  the basis  of a revised
evaluation of the issuer or based upon relevant market considerations. There may
be occasions when, as a result of maturities of portfolio securities or sale  of
Trust shares, or in order to meet anticipated redemption requests, the Trust may
hold cash which is not earning income.

    The  Trust anticipates that  the average weighted  maturity of the portfolio
will be  90  days or  less.  The relatively  short-term  nature of  the  Trust's
portfolio  is expected to result  in a lower yield  than portfolios comprised of
longer-term tax-exempt securities.

    VARIABLE RATE AND FLOATING RATE  OBLIGATIONS. 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" or "floating rate" obligations. The interest rate payable
on  a variable rate  obligation is adjusted  at predesignated periodic intervals
and on a floating rate obligation, 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.  The  Trust  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 Trust 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.

    BROKERAGE ALLOCATION.   Brokerage commissions  are not  normally charged  on
purchases  and sales of short-term  municipal obligations, but such transactions
may involve  transaction costs  in the  form of  spreads between  bid and  asked
prices.  Pursuant to  an order  of the  Securities and  Exchange Commission, the
Trust may effect principal transactions in certain money market instruments with
Dean  Witter.  In  addition,  the  Trust  may  incur  brokerage  commissions  on
transactions conducted through Dean Witter.

SPECIAL CONSIDERATIONS RELATING TO CALIFORNIA TAX-EXEMPT SECURITIES

    The  Trust  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

                                       6
                    ACTIVE ASSETS CALIFORNIA TAX-FREE TRUST
<PAGE>
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% of the
nation's population and 13.3% of its total personal income. Its economy is broad
and diversified  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  the  national  economic  recovery
continued at a strong pace  in the fourth quarter  of 1994, California is  still
experiencing  the effects of a recession. However, the State's budget for fiscal
year 1994-95 assumes  that the  State will  begin to  recover from  recessionary
conditions in 1994, with a modest upturn in 1994 and continuing in 1995.

    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. The  State  has
recorded  General Fund operating deficits in five  of the past six 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 1991,  California increased  taxes by  adding two  new marginal tax
rates, at 10% and 11%,  effective for tax years  1991 through 1995. After  1995,
the  maximum personal income  tax rate is  scheduled to return  to 9.3%, and the
alternative minimum tax rate is scheduled to drop from 8.5% to 7%. In  addition,
legislation  in July 1991  raised the sales  tax by 1.25%.  0.5% was a permanent
addition to counties, but  with the money  earmarked to trust  funds to pay  for
health  and welfare programs  whose administration was  transferred to counties.
This tax increase will be cancelled if a court rules that such transfer and  tax
increase violate any constitutional requirements. 0.5% of the State tax rate was
scheduled  to expire on June  30, 1993, but was extended  for six months for the
benefit  of  counties  and  cities.  On  November  2,  1993,  voters  made  this
half-percent  levy  a  permanent source  of  funding for  local  government. The
1994-1995 State budget does not include any additional sales tax rate.

    On July 8, 1994, the Governor of California signed into law a $57.5  billion
budget which, among other things: (a) reduces welfare grants and aid to families
and  to the aged, blind  and disabled, and (b) relies  on the State's ability to
obtain $2.8 billion  in new reimbursement  from the federal  government for  the
State's  cost of serving illegal immigrants.  Although the State legislature has
passed a standby measure which could trigger automatic budget reductions if  the
state's  fiscal condition worsens over the next  two years, the stability of the
budget would  be jeopardized  if the  state is  unable to  obtain the  hoped-for
federal funds.

    The  current budget includes General Fund spending of $40.9 billion, up 4.2%
from the  level of  spending during  the 1993-94  fiscal year.  The budget  also
envisions  General Fund  spending climbing  another 8.4%  in the  1995-96 fiscal
year. The budget forecasts levels of revenues and expenditures which will result
in operating surpluses in both 1994-95  and 1995-96, leading to the  elimination
of an estimated $2.0 billion accumulated budget deficit by June 30, 1996.

    Because  of  the State's  continuing  budget problems,  the  State's General
Obligation bonds

                                       7
                    ACTIVE ASSETS CALIFORNIA TAX-FREE TRUST
<PAGE>
were downgraded in July 1994 from Aa to A1 by Moody's, to A from A+ by  Standard
&  Poor's, and from  AA to A by  Fitch Investors Service,  Inc. All three rating
agencies expressed uncertainty in the State's  ability to balance its budget  by
1996.

    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.

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

    Investment  restrictions listed below are  among the restrictions which have
been adopted by the Trust as fundamental policies. Under the Act, a  fundamental
policy  may not  be changed without  the vote  of a majority  of the outstanding
voting securities of the Trust, 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; (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 does not require elimination of any security from the portfolio.

    The Trust may not:

        1.  With respect to 75% of its total assets, purchase securities of  any
    issuer  if, immediately thereafter, more than  5% (10% where the security is
    the guarantee of a  security) of the  value of its total  assets are in  the
    securities  of any one 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.   With respect to 75% of its  total assets, purchase more than 10% of
    all outstanding taxable debt securities of  any one issuer (other than  debt
    securities issued, or guaranteed as to principal and interest by, the United
    States Government, its agencies or instrumentalities).

        3.   Invest  25% or  more of the  value of  its total  assets in taxable
    securities of  issuers  in  any one  industry  (industrial  development  and
    pollution  control bonds are grouped into industries based upon the business
    in which the issuers of such obligations are engaged). 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, or to  domestic bank obligations  (including
    domestic branches of foreign banks).

    The  Trust will  comply with any  investment policies  necessitated by rules
governing the pricing of shares of money market funds (see "How Net Asset  Value
is  Determined" in the  Appendix), even though an  investment restriction of the
Trust is less restrictive than the related policy.

                                       8
                    ACTIVE ASSETS CALIFORNIA TAX-FREE TRUST
<PAGE>
                   ACTIVE ASSETS GOVERNMENT SECURITIES TRUST

       TWO WORLD TRADE CENTER, NEW YORK, NEW YORK 10048 - (212) 392-5000

    Active Assets Government Securities Trust (the "Government Securities Trust"
or  the  "Trust")  is  a  no-load,  diversified  open-end  management investment
company. The Trust is authorized to reimburse Dean Witter Distributors Inc.  for
specific  expenses incurred in promoting the  distribution of the Trust's shares
pursuant to a Plan of Distribution  pursuant to Rule 12b-1 under the  Investment
Company  Act of  1940, as  amended (the  "Act"). Reimbursement  may in  no event
exceed an amount equal to  payments at the annual rate  of 0.15% of the  average
daily net assets of the Trust.

    The investment objectives of the Trust are high current income, preservation
of  capital and liquidity.  The Trust will  seek to achieve  these objectives by
investing in  a diversified  portfolio of  short-term money  market  instruments
issued  or  guaranteed  by  the  United States  Government  or  its  agencies or
instrumentalities.

    AN INVESTMENT IN  THE TRUST IS  NEITHER INSURED NOR  GUARANTEED BY THE  U.S.
GOVERNMENT.  THERE IS  NO ASSURANCE THAT  THE TRUST  WILL BE ABLE  TO MAINTAIN A
STABLE NET ASSET VALUE OF $1.00 PER SHARE.

    SHARES OF THE  TRUST 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.

                               TABLE OF CONTENTS

<TABLE>
<S>                                                 <C>
Highlights/2                                        How Net Asset Value is Determined/A-4
Summary of Trust Expenses/3                         Confirmations/A-5
Financial Highlights/3                              The Trusts and Their Management/A-5
Investment Objectives and Policies/4                Plan of Distribution/A-6
Purchase and Redemption of Shares/A-1               Dividends, Distributions and Taxes/A-6
    Purchase of Shares/A-1                          General Information/A-9
    Purchase of Shares by Non-Participants in       Voting Rights/A-9
      Active Assets Program/A-2                     Custodian/A-10
    Redemption of Shares/A-3                        Shareholder Inquiries/A-10
    Redemption of Shares by Non-Participants in
      Active Assets Program/A-4
</TABLE>

    THIS PROSPECTUS SETS FORTH CONCISELY THE INFORMATION YOU SHOULD KNOW  BEFORE
INVESTING  IN THE TRUST.  IT SHOULD BE  READ AND RETAINED  FOR FUTURE REFERENCE.
ADDITIONAL INFORMATION  ABOUT  THE  TRUST  IS  CONTAINED  IN  THE  STATEMENT  OF
ADDITIONAL  INFORMATION, DATED  AUGUST 29, 1995,  WHICH HAS BEEN  FILED WITH THE
SECURITIES AND EXCHANGE  COMMISSION, AND WHICH  IS AVAILABLE AT  NO CHARGE  UPON
REQUEST  OF THE  TRUST AT  THE ADDRESS  LISTED ABOVE  OR BY  CALLING DEAN WITTER
INTERCAPITAL  INC.  (THE  "INVESTMENT  MANAGER"  OR  "INTERCAPITAL")  AT   (212)
392-2550.  THE  STATEMENT OF  ADDITIONAL INFORMATION  IS INCORPORATED  HEREIN BY
REFERENCE.

    THE INFORMATION IN THIS  PROSPECTUS SHOULD BE READ  IN CONJUNCTION WITH  THE
INFORMATION APPEARING ELSEWHERE IN THIS DOCUMENT, INCLUDING THE APPENDIX HERETO,
WHICH IS PART OF THIS PROSPECTUS, AND IN THE DEAN WITTER CLIENT AGREEMENT.

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.
                            ------------------------

                THE DATE OF THIS PROSPECTUS IS AUGUST 29, 1995.
                   ACTIVE ASSETS GOVERNMENT SECURITIES TRUST
<PAGE>
HIGHLIGHTS

   
<TABLE>
<S>                    <C>
THE                    A  no-load, open-end diversified management investment  company investing principally in short-term
TRUST                  money market instruments issued or  guaranteed by the United States  Government or its agencies  or
                       instrumentalities.  The Trust is authorized to reimburse Dean Witter Distributors Inc. for specific
                       expenses incurred  in promoting  the distribution  of  the Trust's  shares pursuant  to a  Plan  of
                       Distribution  pursuant to Rule 12b-1  under the Act. (see  page A-6). The Trust  is organized as an
                       unincorporated business trust under the laws of Massachusetts. (see page A-5).
------------------------------------------------------------------------------------------------------------------------
SHARES                 The shares of  the Government Securities  Trust are offered  to participants in  the Active  Assets
OFFERED                program  of Dean Witter and to non-participants who wish  to invest directly in shares of the Trust
                       (See page A-2). The  primary components of  the Active Assets program  are the Securities  Account,
                       which  is linked to  the Active Assets Insured  Account, the Active Assets  Money Trust, the Active
                       Assets Tax-Free Trust,  the Active Assets  California Tax-Free Trust  or the Government  Securities
                       Trust, and to the Visa Account. See the Dean Witter Client Agreement for further information.
------------------------------------------------------------------------------------------------------------------------
PURCHASE               Pursuant to the Dean Witter Client Agreement between Dean Witter and the customer, free credit cash
OF SHARES              balances  in an Active  Assets account will automatically  be invested in  shares of the Government
                       Securities Trust daily at their net asset value without any sales charge. Dean Witter  Distributors
                       Inc.  is  the  Distributor of  shares  of  the Trust.  Investments  in  shares are  made  under the
                       circumstances described under "Purchase and Redemption of Shares" (see page A-1).  Non-participants
                       in the Active Assets program should refer to the discussion appearing at page A-2.
------------------------------------------------------------------------------------------------------------------------
INVESTMENT             High  current income, preservation of capital and liquidity (see page 4). There can be no assurance
OBJECTIVES             that the Trust's investment objectives will be achieved.
------------------------------------------------------------------------------------------------------------------------
INVESTMENT             A diversified portfolio of short-term money market  instruments issued or guaranteed by the  United
POLICY                 States Government or its agencies or instrumentalities (see page 4).
------------------------------------------------------------------------------------------------------------------------
INVESTMENT             Dean  Witter  InterCapital  Inc.,  the  Investment  Manager  of  the  Trust,  and  its wholly-owned
MANAGER                subsidiary, Dean Witter Services Company, Inc.,  serve in various investment management,  advisory,
                       management  and administrative capacities to ninety-four  investment companies and other portfolios
                       with assets under management of approximately $73.2 billion at June 30, 1995 (see page A-5).
------------------------------------------------------------------------------------------------------------------------
MANAGEMENT             Monthly fee at an annual rate of 1/2 of 1% of average daily net assets, scaled down on assets  over
FEE                    $500 million (see page A-5).
------------------------------------------------------------------------------------------------------------------------
DISTRIBUTOR            Dean  Witter Distributors  Inc. (the "Distributor")  sells shares  of the Fund  through Dean Witter
                       Reynolds Inc.  Other  than  the  reimbursement  to the  Distributor  pursuant  to  the  Rule  12b-1
                       Distribution Plan, the Distributor receives no distribution fees (see page A-2).
------------------------------------------------------------------------------------------------------------------------
PLAN OF                The Fund is authorized to reimburse specific expenses incurred in promoting the distribution of the
DISTRIBUTION           Fund's  shares pursuant to a plan of Distribution with the Distributor pursuant to Rule 12b-1 under
                       the Investment  Company Act  of 1940.  Reimbursement may  in no  event exceed  an amount  equal  to
                       payments at the annual rate of 0.15 of 1% of average daily net assets of the Fund (see page A-6).
------------------------------------------------------------------------------------------------------------------------
DIVIDENDS              Automatically reinvested daily in additional shares at net asset value (see page A-6).
------------------------------------------------------------------------------------------------------------------------
REPORTS                Individual  monthly account statements from  Dean Witter on the  Dean Witter Transaction Statement;
                       annual and semi-annual Trust financial statements.
------------------------------------------------------------------------------------------------------------------------
REDEMPTION             For participants in the Active  Assets program, shares of the  Government Securities Trust will  be
OF SHARES              redeemed  at net  asset value  automatically to  satisfy debit  balances in  the securities account
                       created by activity therein  or to satisfy amounts  owing in the Visa  Account resulting from  Visa
                       card  purchases, cash advances or checks written  against the Visa Account. Non-participants in the
                       Active Assets program should refer to the discussion appearing at page A-4. It is anticipated  that
                       the net asset value will remain constant at $1.00 per share. Dean Witter has the right to terminate
                       a  shareholder's Active  Assets service, in  which event all  Trust shares held  in a shareholder's
                       account will be involuntarily redeemed. The Trust also  reserves the right to reduce the number  of
                       shares  in all accounts if the  Trustees determine that this is  necessary to maintain the constant
                       $1.00 per share net asset value. See "Purchase and Redemption of Shares" (page A-1).
------------------------------------------------------------------------------------------------------------------------
RISKS                  The Trust invests principally in  high quality, short-term securities  issued or guaranteed by  the
                       U.S.  Government or its agencies or instrumentalities which  are subject to minimal risk of loss of
                       income and  principal. However,  the investor  is directed  to the  discussion under  the  captions
                       "Investment  Objectives and Policies" (page 4),  "Repurchase Agreements" (page 5), and "When-Issued
                       and Delayed  Delivery Securities"  (page 5)  concerning the  risks associated  with such  portfolio
                       securities and management strategies.
------------------------------------------------------------------------------------------------------------------------
    THE  SUMMARY INFORMATION ABOVE SHOULD BE READ IN CONJUNCTION WITH THE DETAILED INFORMATION APPEARING ELSEWHERE IN THIS
PROSPECTUS, INCLUDING THE APPENDIX HERETO, IN THE DEAN WITTER CLIENT AGREEMENT AND IN THE TRUST'S STATEMENT OF  ADDITIONAL
INFORMATION, INCLUDING THE APPENDIX THERETO.
</TABLE>
    

                                       2

                   ACTIVE ASSETS GOVERNMENT SECURITIES TRUST
<PAGE>
SUMMARY OF TRUST EXPENSES
--------------------------------------------------------------------------------
    The  following table illustrates all expenses and fees that a shareholder of
the Trust will incur. The expenses and fees  set forth in the table are for  the
fiscal year ended June 30, 1995.
<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...................  None
Redemption Fees.........................  None
Exchange Fee............................  None

<CAPTION>
ANNUAL TRUST OPERATING EXPENSES (AS A
 PERCENTAGE OF AVERAGE NET ASSETS)
----------------------------------------
<S>                                       <C>
Management Fees.........................    0.50%
12b-1 Fees..............................    0.10%
Other Expenses..........................    0.07%
                                          -------
Total Trust Operating Expenses..........    0.67%
                                          -------
                                          -------
</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:                       $ 7       $21       $37       $83
</TABLE>

    Dean Witter charges an annual Active Assets program participation fee of $80
($100 for corporate participants). Shareholders of the Trust who are not program
participants will not be charged an Active Assets program fee.

    The  above  example should  not be  considered a  representation of  past or
future expenses or performance. Actual expenses  of the Trust 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 Trust will bear directly  or
indirectly.  For a  more complete description  of these costs  and expenses, see
pages A-5 and A-6 in the Appendix to this Prospectus.

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  and notes thereto and  the report of independent
accountants which are contained in the Statement of Additional Information.
    

<TABLE>
<CAPTION>
                                                                   FOR THE YEAR ENDED JUNE 30,
                                -------------------------------------------------------------------------------------------------
                                 1995      1994      1993      1992      1991      1990      1989      1988      1987      1986
                                -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
<S>                             <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of
 period.......................  $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00
                                -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
Net investment income.........   0.048     0.027     0.027     0.043     0.065     0.077     0.079     0.062     0.055     0.069
Less dividends from net
 investment income............  (0.048)   (0.027)   (0.027)   (0.043)   (0.065)   (0.077)   (0.079)   (0.062)   (0.055)   (0.069)
                                -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
Net asset value, end of
 period.......................  $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00    $ 1.00
                                -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
                                -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
TOTAL INVESTMENT RETURN.......    4.92%     2.76%     2.71%     4.37%     6.72%     8.03%     8.20%     6.41%     5.62%     7.10%
RATIOS TO AVERAGE NET ASSETS:
  Expenses....................    0.67%     0.66%     0.66%     0.68%     0.70%     0.68%     0.70%     0.68%     0.70%     0.71%
  Net investment income.......    4.84%     2.72%     2.68%     4.28%     6.39%     7.74%     7.94%     6.22%     5.47%     6.85%
SUPPLEMENTAL DATA:
Net assets, end of period, in
 millions.....................     $542      $472      $509      $533      $597      $300      $244      $236      $177      $182
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS

                                       3

                   ACTIVE ASSETS GOVERNMENT SECURITIES TRUST
<PAGE>
INVESTMENT OBJECTIVES AND POLICIES
--------------------------------------------------------------------------------

    THE INVESTMENT OBJECTIVES OF THE TRUST ARE HIGH CURRENT INCOME, PRESERVATION
OF CAPITAL AND LIQUIDITY.

    The  Trust seeks to  achieve its objectives by  investing in U.S. Government
securities, including a variety of securities which are issued or guaranteed  by
the United States Treasury, by various agencies of the United States Government,
and by various instrumentalities which have been established or sponsored by the
United  States Government,  and certain  interests in  the foregoing securities.
Except for U.S.  Treasury securities,  these obligations, even  those which  are
guaranteed by Federal agencies or instrumentalities, may or may not be backed by
the  "full faith and credit" of the United States. In the case of securities not
backed by the full faith and credit of the United States, they may be backed, in
part, by a line of credit with  the U.S. Treasury (such as the Federal  National
Mortgage  Association),  or  the  Trust  must  look  to  the  agency  issuing or
guaranteeing the obligation for  ultimate repayment (such  as securities of  the
Federal  Farm Credit System) in which case the Trust may not be able to assert a
claim  against  the   United  States  itself   in  the  event   the  agency   or
instrumentality does not meet its commitments.

    Treasury  securities  include  Treasury  bills,  Treasury  coupons, Treasury
notes, and Treasury bonds (including zero coupon bonds). Some of the  Government
agencies  and instrumentalities which issue  or guarantee securities include the
Federal Farm Credit System, the Federal  Home Loan Banks, the Federal Home  Loan
Mortgage  Corporation, the Government National Mortgage Association, the Federal
National Mortgage Association, the Farmers Home Administration, the Federal Land
Banks, the Small  Business Administration, the  Export-Import Bank, the  Federal
Intermediate Credit Banks and the Banks for Cooperatives.

    The  Trust may invest  in securities issued  or guaranteed by  any agency or
instrumentality established or sponsored by  the United States Government.  Such
investments  may  take  the  form  of participation  interests  in,  and  may be
evidenced by  deposit  or  safekeeping  receipts  for,  any  of  the  foregoing.
Participation  interests are  pro rata  interests in  U.S. Government securities
held by others such as  interests in pools of  mortgages sold by the  Government
National Mortgage Association; instruments evidencing deposit or safekeeping are
docu-
mentary receipts for such original securities held in custody by others.

    The  Federal Deposit  Insurance Corporation is  the administrative authority
over the  Bank Insurance  Fund and  the  Savings Insurance  Fund which  are  the
agencies  of  the U.S.  Government which  insure  (including both  principal and
interest) the deposits of certain banks and savings and loan associations up  to
$100,000  per deposit. Current federal regulations also permit such institutions
to issue insured negotiable certificates of deposit ("CDs") in principal amounts
of $100,000  or more  without regard  to  the interest  rate ceilings  on  other
deposits.  To  remain  fully insured  as  to principal,  these  investments must
currently be limited to $100,000 per  bank or savings and loan association.  The
interest on such investments is not insured. The Trust may invest in such CDs of
banks  and  savings  and loan  institutions  having  total assets  of  less than
$1,000,000,000, limited to the  insured amount of  principal ($100,000) in  each
case  and limited with  regard to all such  CDs and all  illiquid assets, in the
aggregate, to 10% of the Trust's total assets.

    The Trust intends  normally to  hold its portfolio  securities to  maturity.
Historically,  securities issued  or guaranteed  by the  U.S. Government  or its
agencies and instrumentalities have involved  minimal risk of loss of  principal
or interest, if held to maturity.

    The Trust may not borrow money, except from banks for temporary or emergency
purposes,  including the  meeting of  redemption requests  which might otherwise
require the  untimely disposition  of securities.  Borrowing in  the  aggregate,
including  reverse repurchase agreements, may not  exceed 20%, and borrowing for
purposes other than meeting redemptions  may not exceed 5%  of the value of  the
Trust's  total  assets (including  the amount  borrowed), less  liabilities (not
including

                                       4

                   ACTIVE ASSETS GOVERNMENT SECURITIES TRUST
<PAGE>
the amount borrowed) at the time the borrowing is made.

    The investment  objectives and  policies  stated above  may not  be  changed
without  shareholder approval. There is no assurance that the Trust's objectives
will be achieved.

PORTFOLIO MANAGEMENT

    REPURCHASE AGREEMENTS.   The  Trust may  enter into  repurchase  agreements,
which  may  be viewed  as a  type of  secured  lending by  the Trust,  and which
typically involve the acquisition by the  Trust of government securities from  a
selling  financial institution such  as a bank, savings  and loan association or
broker-dealer. The  agreement provides  that the  Trust will  sell back  to  the
institution,  and that the institution  will repurchase, the underlying security
("collateral") at a specified price and at a fixed time in the future. The Trust
will accrue interest from the institution until the time when the repurchase  is
to occur. Although such date is deemed by the Trust to be the maturity date of a
repurchase  agreement,  the  maturities  of  securities  subject  to  repurchase
agreements are not subject to any  limits and may exceed thirteen months.  While
repurchase   agreements  involve  certain  risks   not  associated  with  direct
investments in U.S. Government securities, the Trust follows procedures designed
to  minimize  such   risks.  These  procedures   include  effecting   repurchase
transactions  only with large,  well capitalized and  well established financial
institutions and specifying the required value of the collateral underlying  the
agreement.

    WHEN-ISSUED   AND  DELAYED  DELIVERY  SECURITIES.  The  Trust  may  purchase
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. When
such transactions are negotiated, the price is fixed at the time of  commitment,
but delivery and payment can take place between one month and 120 days after the
date  of the commitment. These securities  are subject to market fluctuation and
no interest accrues to the purchaser during  this period. At the time the  Trust
makes the commitment to purchase securities on a when-issued or delayed delivery
basis,  it will  record the transaction  and thereafter reflect  the value, each
day, of such security in determining its net
asset value.

    All the  foregoing  strategies may  subject  the  Trust to  the  effects  of
interest  rate  fluctuations  to  a  greater extent  than  would  occur  if such
strategies were not used. While such strategies listed above may be used by  the
Trust if, in the opinion of the Investment Manager, they will be advantageous to
the  Trust, the Trust will be free to reduce or eliminate its activity in any of
these areas  without  changing  its  fundamental  investment  policies.  Certain
provisions of the Internal Revenue Code, related regulations, and rulings of the
Internal  Revenue Service  may also  have the effect  of reducing  the extent to
which the  previously  cited  techniques  may  be  used  by  the  Trust,  either
individually  or in combination. Furthermore, there  is no assurance that any of
these strategies or any other strategies and methods available to the Trust will
result in the achievement of its objectives.

    The Trust  will  invest  in  securities of  varying  maturities  and  risks,
although  it will not  invest in securities  with an effective  maturity of more
than one year.  The Trust  will generally  not seek  profits through  short-term
trading, although it may dispose of any portfolio security prior to maturity if,
on the basis of a revised evaluation or other circumstance or consideration, the
Investment Manager deems such disposition advisable.

    The  Trust is expected  to have a  high portfolio turnover  due to the short
maturities of securities  purchased, but this  should not affect  income or  net
asset value as brokerage commissions are not normally charged on the purchase or
sale of money market instruments such as U.S. Government obligations.

    BROKERAGE ALLOCATION.  Brokerage commissions are not normally charged on the
purchase   or  sale  of  money  market   instruments  such  as  U.S.  Government
obligations, but such transactions may involve transaction costs in the form  of
spreads between bid and asked prices. Pursuant to an order of the Securities and
Exchange  Commission,  the Trust  may effect  principal transactions  in certain
money market instruments  with Dean  Witter. In  addition, the  Trust may  incur
brokerage commissions on transactions conducted through Dean Witter.

                                       5

                   ACTIVE ASSETS GOVERNMENT SECURITIES TRUST
<PAGE>
                                    APPENDIX

    THIS  APPENDIX CONSTITUTES  PART OF  THE PROSPECTUSES  OF THE  ACTIVE ASSETS
MONEY TRUST (THE "MONEY TRUST"), THE ACTIVE ASSETS TAX-FREE TRUST (THE "TAX-FREE
TRUST"), THE ACTIVE ASSETS CALIFORNIA  TAX-FREE TRUST (THE "CALIFORNIA  TAX-FREE
TRUST")  AND  THE ACTIVE  ASSETS  GOVERNMENT SECURITIES  TRUST  (THE "GOVERNMENT
SECURITIES TRUST"). THE MONEY TRUST, THE TAX-FREE TRUST, THE CALIFORNIA TAX-FREE
TRUST AND  THE GOVERNMENT  SECURITIES TRUST  ARE REFERRED  TO IN  THIS  APPENDIX
COLLECTIVELY  AS THE "TRUSTS".  UNLESS OTHERWISE INDICATED,  THE INFORMATION SET
FORTH HEREIN IS APPLICABLE TO EACH TRUST.

PURCHASE AND REDEMPTION OF SHARES
--------------------------------------------------------------------------------

PURCHASE OF SHARES

    The shares of the  Trusts are offered to  participants in the Active  Assets
financial  service program (non-participants see  below). Persons subscribing to
the program  will have  the free  credit cash  balances in  their Active  Assets
securities  account invested in  shares of the Money  Trust, the Tax-Free Trust,
the California Tax-Free Trust or the Government Securities Trust or deposited in
the Active  Assets  Insured Account  (a  Federal Deposit  Insurance  Corporation
insured  bank  account),  depending  upon  which  investment  vehicle  has  been
designated by the participant. For  further information consult the Dean  Witter
Client Agreement.

    Purchases  of shares of the Trusts by program participants will be made only
pursuant to the Active Assets automatic purchase procedures described below.

    Subscribers to  Active  Assets  services  have  the  option  to  change  the
designation  of their Trust at  any time by notifying  their Dean Witter Account
Executive.

    The purchase price for shares of the Trusts is the net asset value per share
next determined after receipt by  a Trust of a  purchase order, pursuant to  the
Active  Assets program, in proper form. The Trusts anticipate that the net asset
value will remain constant at $1.00 per share and that any fluctuations in value
will be reflected in the daily dividend  or in the number of outstanding  shares
in  the shareholder's account rather than in the per share dollar value. The net
asset value is determined at  12 noon, New York time,  on each day that the  New
York   Stock  Exchange  is  open  for  business,  immediately  after  the  daily
declaration of dividends or  on each other  day in which  there is a  sufficient
degree of trading in the Trust's portfolio securities that the current net asset
value of the Trust's shares might be materially affected by changes in the value
of  such portfolio securities, but only if on any such day the Trust is required
by the  provisions of  the Active  Assets program  to purchase  or redeem  Trust
shares or receives a request from a non-participant in the Active Assets program
to  purchase or redeem  shares of the  Trust. Shares purchased  will receive the
next dividend declared after  such shares are issued  which will be  immediately
prior  to the 12 noon pricing on the following business day. 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.

    A  purchase order will not be effective until Federal funds become available
to the  Trusts. Federal  funds are  a commercial  bank's deposits  in a  Federal
Reserve  Bank and can be  transferred from one member  bank's account to that of
another member bank on the  same day and thus  are considered to be  immediately
available  funds. There  are no minimum  investment requirements  for the Trusts
(with the exception of non-participants in the Active Assets Program--see below)
although the  minimum requirement  for entry  in the  Active Assets  program  is
currently  $10,000 in cash and/or securities.  Dean Witter reserves the right to
alter or

                                      A-1
<PAGE>
waive the conditions upon which an Active Assets account may be opened.

    Free credit  cash  balances  held  in  an  Active  Assets  account  will  be
automatically  invested daily in shares of  either the Money Trust, the Tax-Free
Trust, the California Tax-Free  Trust or the Government  Securities Trust, if  a
Trust  has been selected for investment by the participant, on each business day
on which the New York Stock Exchange is open. Free credit cash balances will  be
invested in shares at the price next determined, which is 12 noon New York time,
on  the next business day following the credit of any such amounts to the Active
Assets account. Free credit balances arising from a cash payment into an  Active
Assets  account  shall be  so invested  unless  such payment  is made  after the
cashiering deadline of the Dean Witter office  in which the payment is made,  in
which  case the resulting  free credit balance  shall be invested  on the second
following business day  and the  investor will  not receive  the daily  dividend
which  would have been received had such balance been invested in the designated
Trust. An Active Assets participant desiring to make such a cash payment  should
contact  his or her Dean Witter Account Executive for information concerning the
local  office's  cashiering  deadline,  which  is  dependent  on  such  office's
arrangements with its commercial banks.

    Each  Trust  has  entered into  a  Distribution Agreement  with  Dean Witter
Distributors Inc. (the "Distributor"), an  affiliate of InterCapital, which  has
its  principal executive offices at  Two World Trade Center,  New York, New York
10048. The  Distribution  Agreements obligate  the  Distributor to  pay  certain
expenses  in connection with the offering of the shares of the Trusts, including
costs involved  in the  distribution  of prospectuses  and periodic  reports  to
investors,  other supplementary sales literature and advertising costs. However,
costs and expenses incurred by the  Distributor may be reimbursed by the  Trusts
pursuant  to the provisions of the  respective Plans of Distribution pursuant to
Rule 12b-1 (see page A-6).

    From time to time, certain state administrative agencies may raise questions
as to whether  the operation of  the Active Assets  program constitutes  banking
under  the laws of  their state. In  addition, legislation has  been proposed in
certain states which,  if enacted, could  require a modification  of the  Active
Assets  program in those states.  The Distributor and Dean  Witter are not banks
and believe that the operation of the Active Assets program does not  constitute
banking  under the laws of any state.  The Distributor and Dean Witter intend to
fully contest and resist any regulatory or legislative challenges to the  Active
Assets  program.  Final adverse  rulings  in any  state  that the  Active Assets
program constitutes unauthorized banking therein or the adoption of  legislation
by  any state  affecting the  Active Assets  program could  force the  Trusts to
liquidate shares of residents in such state or to cease offering their shares in
such state as part of the Active Assets program.

PURCHASE OF SHARES BY NON-PARTICIPANTS IN ACTIVE ASSETS PROGRAM

    Shares of the  Trusts may  be purchased by  investors maintaining  brokerage
accounts  with Dean Witter  who choose not  to participate in  the Active Assets
program. Shareholders  of the  Trusts  not participating  in the  Active  Assets
program  will not  be charged  a program fee.  The minimum  initial purchase for
non-participants is  $5,000  and  the minimum  subsequent  purchase  is  $1,000.
Non-participants  in the  Active Assets program  who are  participating in other
brokerage account programs with  Dean Witter may  have different initial  and/or
subsequent purchase minimum accounts, and may make share purchases automatically
through their account programs. Dean Witter account holders should contact their
account executive for further information concerning methods of purchase.

    The  Trusts have been created for the  purpose of serving as investments for
participants in the  Active Assets program  and, as such,  do not in  themselves
offer  such typical  money market  fund features  as check  writing and exchange
privileges. There  are other  money  market funds,  including funds  managed  by
InterCapital,  which have investment objectives similar  to the Trusts and which
offer check writing and  exchange privileges. Prior to  making an investment  in
any such money market fund, an investor should obtain and read the prospectus.

                                      A-2
<PAGE>
REDEMPTION OF SHARES

    Each  Trust is required to redeem for cash all full and fractional shares of
the Trust. The redemption price is the net asset value per share next determined
after  receipt  by  Dean  Witter   Trust  Company  (the  "Transfer  Agent")   of
instructions  from Dean  Witter in accordance  with the  automatic procedure set
forth below  (non-participants in  the Active  Assets program  see below).  Such
instructions  are delivered to the Transfer  Agent prior to the determination of
net asset value at 12 noon,  New York time, on any  day that the New York  Stock
Exchange  is  open for  business,  or on  each  other day  in  which there  is a
sufficient degree  of  trading in  the  Trust's portfolio  securities  that  the
current  net asset value of  the Trust's shares might  be materially affected by
changes in the value of such portfolio  securities, but only if on any such  day
the Trust is required by the provisions of the Active Assets program to purchase
or  redeem Trust shares. Payment of the  redemption proceeds will be made on the
same day  the  redemption  becomes effective.  Shareholders  will  receive  upon
redemption all dividends declared and reinvested until the time of redemption.

    Redemption  will be automatically  effected by Dean  Witter to satisfy debit
balances in the  Securities Account created  by activity therein  or to  satisfy
debit  balances created by  Visa credit card purchases,  cash advances or checks
written  against  the  Visa  Account.   Each  Active  Assets  account  will   be
automatically  scanned  for debits  each business  day that  the New  York Stock
Exchange is open for business as of the close of business on that day, and after
application of any free credit  cash balances in the  account to such debits,  a
sufficient  number of Trust shares owned  by the Active Assets participants will
be redeemed  at 12  noon the  following business  day to  satisfy any  remaining
debits  in either the Securities Account or  the Visa Account. Margin loans will
be utilized  to satisfy  debits remaining  after the  liquidation of  all  Trust
shares in an Active Assets participant's account and shares may not be purchased
until all debits and margin loans in the account are satisfied. Dean Witter (not
the  Trusts) may impose a fee for the use of the Visa credit card to obtain cash
advances.

    The right to receive payment with respect to any redemption may be suspended
by each Trust for a period of up  to seven days. Suspensions of more than  seven
days  may not be  made except (1) for  any period (a) during  which the New York
Stock Exchange is closed  other than customary weekend  and holiday closings  or
(b)  during which trading on the New  York Stock Exchange is restricted; (2) for
any period during which an emergency exists as a result of which (a) disposal by
the Trust of securities owned by it  is not reasonably practicable or (b) it  is
not  reasonably practicable for the  Trust to fairly determine  the value of its
net assets;  or  (3) for  such  other periods  as  the Securities  and  Exchange
Commission  may by order  permit for the  protection of security  holders of the
Trust. The Commission shall  by rules and  regulations determine the  conditions
under  which (i) trading shall be deemed  to be restricted and (ii) an emergency
shall be deemed  to exist within  the meaning  of clause (2)  above. At  various
times  the Trusts may be  requested to redeem shares  with respect to which good
payment has not  yet been received  by the  Distributor. A Trust  may delay,  or
cause  to be delayed, the payment of  the redemption proceeds until such time as
it has assured itself that good payment  has been collected for the purchase  of
such shares. In addition, where the shares to be redeemed have been purchased by
check  (including a  certified or  bank cashier's  check), automatic  and manual
redemptions 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).

    The total value  of a shareholder's  investment in  a Trust at  the time  of
redemption  may be more or less than his  or her cost, depending on the value of
the securities held by the Trust at such time and income earned.

    If a participant wishes to reduce or eliminate his or her investment in  the
Trust shares component of the Active Assets program, he or she should first call
the  Active  Assets information  number shown  on the  cover page  preceding the
Active Assets Money  Trust Prospectus, to  ascertain the balance  in his or  her
Trust  Account. He  or she  may then withdraw  an amount  equal to  the value of

                                      A-3
<PAGE>
such shares, less any charges  pending in his or  her Active Assets account,  in
any of the following ways:

    (a) by writing a check against the Visa Account in such amount;

    (b)  by obtaining a  cash advance from  a Visa participating  bank or branch
        thereof for such amount (which the bank may limit to $5,000 per  account
        per day); or

    (c)  by calling his  or her Dean  Witter Account Executive  and requesting a
        cash disbursement from the Active Assets program for such amount.

    In any of the above methods, the Trust share balance at any time is  subject
to reduction due to prior debits against the participant's account. Accordingly,
if  payment is  requested through  the Visa  Account check  or the  cash advance
methods and if any other debits are paid by automatic redemption of Trust shares
prior to the time  the check or  cash advance charge  is presented for  payment,
then  the Trust share  balance will be reduced.  If so, payment  of the check or
cash advance may be paid  in part from the margin  loan value of the  Securities
Account or may result in an overdraft. In addition, Dean Witter (not the Trusts)
may impose a fee for the checkwriting service on certain Active Assets accounts.

    Under  the Active  Assets program,  both Dean Witter  and Bank  One have the
right to terminate an Active Assets account  for any reason. In such event,  all
shares held in a shareholder's account will be redeemed.

REDEMPTION OF SHARES BY NON-PARTICIPANTS IN ACTIVE ASSETS PROGRAM

    Shareholders  who are not participating in  the Active Assets program should
contact Dean Witter, through his  or her account executive,  on any day the  New
York  Stock Exchange is open, to effect a redemption of shares of the Trust. All
such redemption  requests will  be  promptly forwarded  to the  Transfer  Agent;
redemption  requests should not be  sent directly to the  Trusts or the Transfer
Agent. If such requests are inadvertently  sent to the Trust or Transfer  Agent,
they  will  be  forwarded to  the  Distributor.  Cash proceeds  from  the manual
redemption of Trust shares ordinarily will be credited to the shareholder's Dean
Witter brokerage account or,  on request, will be  mailed to the shareholder  at
his or her address of record. In certain instances, as where redemption requests
are  received in writing, such redemption  requests will require written notices
containing  the  signatures  of  all  persons  in  whose  name  the  shares  are
registered,  or  additional  documents  such  as,  but  not  limited  to,  trust
instruments, death certificates, appointments  as executor or administrator,  or
certificates  of  corporate  authority. Non-participants  in  the  Active Assets
program who  are participating  in other  brokerage account  programs with  Dean
Witter  may effect redemption of shares  automatically, as provided for in their
account program.  Dean  Witter  account holders  should  contact  their  account
executive for further information concerning methods of redemption.

HOW NET ASSET VALUE IS DETERMINED

    The  net asset value per share of each Trust, for the purpose of calculating
the price  at  which  shares are  issued  and  redeemed, is  determined  by  the
Investment  Manager as of  12 noon New York  time on each day  that the New York
Stock Exchange is open for business, immediately after the daily declaration  of
dividends.  Each Trust will also calculate such price on each other day in which
there is a sufficient  degree of trading in  that Trust's portfolio  securities,
such  that the current net asset value of the Trust's shares might be materially
affected by changes in the  value of such portfolio  securities, but only if  on
any  such  day the  Trust is  required by  the provisions  of the  Active Assets
program to  purchase  or  redeem Trust  shares  or  receives a  request  from  a
non-participant in the Active Assets program to purchase or redeem Trust shares.
The  determination of net asset  value is made by  subtracting from the value of
the assets of a Trust the amount of its liabilities, and dividing the  remainder
by the number of outstanding shares of the Trust.

    The  Trusts utilize  the amortized  cost method  in valuing  their portfolio
securities, even though  the portfolio  securities may increase  or decrease  in
market  value, generally, in regards to changes in interest rates. The amortized
cost method of
valua-

                                      A-4
<PAGE>
tion involves valuing a security at its cost adjusted by a constant amortization
to maturity of any original issue discount or premium, regardless of the  impact
of fluctuating interest rates on the market value of the instrument. The purpose
of this method of calculation is to facilitate the maintenance of a constant net
asset  value per share of  $1.00, although there is  no assurance that the $1.00
net asset value will be maintained.

CONFIRMATIONS

    All purchases and  redemptions of  Trust shares  and dividend  reinvestments
will  be confirmed monthly to the shareholder  (rounded to the nearest share) in
the Active Assets Account Statement. Dean Witter has received an exemptive order
from the Securities and Exchange Commission which permits it to omit sending out
more frequent confirmations with respect to purchases and redemptions.

    In the interest  of economy  and convenience  and because  of the  operating
procedures  of the Trusts, certificates representing the Trusts' shares will not
be physically  issued. Shares  are  maintained by  the  Trusts on  the  register
maintained  by the  Transfer Agent  and the holders  thereof will  have the same
rights of ownership  with respect  to such shares  as if  certificates had  been
issued.

THE TRUSTS AND THEIR MANAGEMENT
--------------------------------------------------------------------------------

    Money  Trust,  Tax-Free  Trust,  California  Tax-Free  Trust  and Government
Securities Trust  are all  no-load, open-end  diversified investment  management
companies.  Money  Trust, Tax-Free  Trust and  Government Securities  Trust were
organized under the laws of the Commonwealth of Massachusetts as business trusts
on March 30, 1981. California Tax-Free Trust was organized under the laws of the
Commonwealth of Massachusetts as a business trust on July 10, 1991.

    InterCapital, located at Two World Trade  Center, New York, New York  10048,
is   the  Trusts'  Investment   Manager.  The  Investment   Manager,  which  was
incorporated in July, 1992,  is a wholly-owned subsidiary  of Dean Witter.  Dean
Witter  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 ninety-four investment companies (the "Dean Witter
Funds"), thirty  of  which are  listed  on the  New  York Stock  Exchange,  with
combined  assets of approximately  $71 billion at June  30, 1995. The Investment
Manager also  manages  portfolios  of  pension  plans,  other  institutions  and
individuals which aggregated approximately $2.2 billion at such date.

    The  Trusts have 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  Trusts' Trustees review the various services provided by the Investment
Manager to ensure that the Trusts' general investment policies and programs  are
being  properly carried out and that  administrative services are being provided
to the Trusts in a satisfactory manner.

                                      A-5
<PAGE>
    As full compensation for the services and facilities furnished to the Trusts
and expenses of the Trusts assumed by the Investment Manager, the Trusts pay the
Investment  Manager  monthly  compensation   calculated  daily  by  applying   a
percentage  rate to the daily net assets  of each of the respective Trusts which
declines as net assets of the Trusts reach specified levels (up to $3  billion).
For  the fiscal years ended June 30, 1995, the Trusts accrued total compensation
to the  Investment Manager  amounting to  0.32% (Money  Trust), 0.42%  (Tax-Free
Trust),  0.50%  (California  Tax-Free Trust)  and  0.50%  (Government Securities
Trust) of the respective Trusts' average daily net assets and the Trusts'  total
expenses  amounted  to  0.49%  (Money  Trust),  0.56%  (Tax-Free  Trust),  0.67%
(California Tax-Free  Trust)  and 0.67%  (Government  Securities Trust)  of  the
respective Trusts' average daily net assets.

PLAN OF DISTRIBUTION

    Each  Trust has adopted a Plan of  Distribution pursuant to Rule 12b-1 under
the Act. Under the respective Plans, the Distributor has expanded the nature  of
its  promotional activities on behalf of the respective Trusts and uses its best
efforts to foster additional sales of Trust shares. The respective Plans provide
that the  Distributor  bear the  expense  of all  promotional  and  distribution
related  activities on behalf of the respective Trusts, except for expenses that
the  respective  Trustees  determine  to  reimburse,  as  described  below.  The
following  activities and services may be  provided by the Distributor under the
respective Plans: (1) compensation to  sales representatives of Dean Witter  and
other  broker-dealers; (2) sales incentives and bonuses to sales representatives
and to marketing personnel in connection  with promoting sales of shares of  the
Trusts;  (3) expenses incurred  in connection with promoting  sales of shares of
the Trusts; (4) preparing and  distributing sales literature; and (5)  providing
advertising  and promotional activities, including  direct mail solicitation and
television,  radio,  newspaper,   magazine  and   other  media   advertisements.
Reimbursements  for these services are made in monthly payments by each Trust at
the annual rate of  up to 0.15  of 1% of  the average daily  net assets of  each
Trust.  Such  payments  were made  by  Money Trust,  Tax-Free  Trust, California
Tax-Free Trust and Government Securities Trust at the annual rate of 0.10 of  1%
of each Trust's average daily net assets for their respective fiscal years ended
June  30,  1995. Dean  Witter  account executives  are  paid an  annual residual
commission, currently a gross residual of up to 0.10 of 1% of the current  value
of the respective accounts of which they are the account executive of record. In
addition,  some  Dean  Witter  sales personnel  will  receive  various  types of
non-cash compensation as special sales incentives, including trips,  educational
and/  or business seminars and merchandise. Expenses incurred by the Distributor
pursuant to the Plans  in any fiscal  year will not be  reimbursed by any  Trust
through payments accrued in any subsequent fiscal year.

    Each  Trust's  expenses  include:  the Investment  Management  fee;  the fee
pursuant to the  Plan of Distribution  (see "Purchase of  Fund Shares");  taxes;
certain  legal, transfer  agent, custodian and  auditing fees;  and printing and
other expenses  relating  to the  Trust's  operations which  are  not  expressly
assumed by the Investment Manager under its Investment Management Agreement with
each Trust.

DIVIDENDS, DISTRIBUTIONS AND TAXES
--------------------------------------------------------------------------------

DIVIDENDS AND DISTRIBUTIONS

    Each  Trust  declares dividends,  payable  on each  day  the New  York Stock
Exchange is open for business, of all  of its daily net investment income  (and,
with  respect to  Money Trust  and Government  Securities Trust,  net short-term
capital gains, if any) to shareholders of record as of 12 noon New York time  of
the  preceding  business  day. With  respect  to Tax-Free  Trust  and California
Tax-Free Trust, dividends  from net short-term  capital gains, if  any, will  be
paid  periodically. The amount of dividend may fluctuate from day to day and may
be

                                      A-6
<PAGE>
omitted on some  days if net  realized losses on  portfolio securities exceed  a
Trust's  net investment income. Dividends  are automatically reinvested daily in
additional full and  fractional shares of  a Trust  at the net  asset value  per
share determined at 12 noon, New York time on that day.

    Each Trust intends to distribute dividends from net long-term capital gains,
if  any, at least once each year. A Trust may, however, elect to retain all or a
portion of any net long-term capital gains in any year for reinvestment.

    Dean Witter will send to  each shareholder a monthly  summary of his or  her
account,  including information as  to dividends reinvested,  on the Dean Witter
Transaction Statement.

TAXES

    Because  the  Trusts  currently  intend  to  distribute  all  of  their  net
investment  income and net capital gains, if  any, to shareholders and intend to
otherwise comply with all the provisions of Subchapter M of the Internal Revenue
Code, as amended (the "Code"), to qualify as regulated investment companies,  it
is not expected that the Trust will be required to pay any federal income tax.

    To  avoid  being  subject  to  a  31%  federal  withholding  tax  on taxable
dividends,  capital   gains   distributions   and   proceeds   of   redemptions,
shareholders' taxpayer identification numbers must be furnished and certified as
to accuracy.

    MONEY TRUST AND GOVERNMENT SECURITIES TRUST. Distributions of net investment
income  and realized net short-term capital gains are taxable to shareholders as
ordinary income, whether such distributions are  taken in cash or reinvested  in
additional shares. Distributions of long-term capital gains, if any, are taxable
as  long-term capital gains, regardless  of how long the  shareholder has held a
Trust's shares. No portion of such  dividends or distributions will be  eligible
for the federal dividends received deduction for corporations. The Trusts advise
their shareholders annually as to the federal income tax status of distributions
paid during each calendar year.
    TAX-FREE  TRUST AND CALIFORNIA TAX-FREE TRUST.  The Trusts intend to qualify
to pay "exempt-interest dividends"  to their shareholders  by maintaining as  of
the  close of each quarter of  their taxable year, at least  50% of the value of
their  total  assets  in  tax-exempt  securities.  If  a  Trust  satisfies  such
requirement, dividends from net investment income to shareholders, whether taken
in  cash or reinvested in additional Trust shares, will be excludable from gross
income for federal  income tax  purposes to the  extent net  interest 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  Code  now subjects  interest received  on certain  otherwise tax-exempt
securities to an alternative minimum  tax. This alternative minimum tax  applies
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  a  Trust's
investments may be made in such "private activity bonds," with the result that a
portion  of the exempt-interest dividends paid by a Trust 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  preadjustment  alternative  minimum
taxable income.

    Under  California law, an investment company  which qualifies as a regulated
investment company

                                      A-7
<PAGE>
must have at least 50% of the  value of its total assets invested in  California
state  and local issues or in obligations of  the United States which if held by
an individual, would pay  interest excludable from income  (or in a  combination
thereof), 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 of California Tax-Free Trust 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 Trust and derived from California state  and
local issues or certain United States issues whether taken in cash or reinvested
in  additional  shares  to  the  extent that  such  dividends  are  derived from
California securities.

    Within 60 days after  the end of  its fiscal year, the  Trusts will mail  to
shareholders  statements 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. This  percentage
should  be applied uniformly to any distributions made during the fiscal year to
determine the proportion  of dividends  that is tax-exempt.  The percentage  may
differ  from  the  percentage  of  tax-exempt  dividend  distributions  for  any
particular month.

    Unlike federal  law,  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 (from the  California Tax-Free Trust) will
have no effect on an individual's California personal income tax.

    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, if any. For federal 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 a Trust's shares and regardless of whether the distribution is received
in additional shares or  cash. In addition, for  California personal income  tax
purposes,  the shareholders of the California Tax-Free Trust will not be subject
to tax, or receive a credit for tax paid by the Trust, on undistributed  capital
gains,  if any. With  respect to the  Tax-Free Trust, 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  Trust  may  be  subject  to  state  and  local  taxes  on
exempt-interest dividends.

    Distributions from investment  income and long-term  and short-term  capital
gains  will not  be excluded from  taxable income in  determining the California
corporate income or franchise tax for corporate shareholders. Such distributions
also may be  includable in  income subject to  the alternative  minimum tax.  In
addition,  distributions  from investment  income  and long-term  and short-term
capital gains may be subject to state taxes in states other than California  and
to local taxes.

    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 Trust, generally will  not be deductible by the investor
for federal or California 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.

                                      A-8
<PAGE>
    Shareholders  should consult their  tax advisers as  to the applicability of
the above to their own tax situation.

CURRENT AND EFFECTIVE YIELD

    From time to time the Trusts advertise their "yield" and "effective  yield."
Both  yield figures  are based  on historical earnings  and are  not intended to
indicate future  performance.  The "yield"  of  a  Trust refers  to  the  income
generated  by an investment  in the Trust  over a given  seven-day period (which
period will be stated in the  advertisement). This income is then  "annualized."
That  is, the amount of income generated by the investment during that seven-day
period is assumed to be generated each seven-day period within a 365-day  period
and  is shown  as a percentage  of the  investment. The "effective  yield" for a
seven-day period is calculated similarly but, when annualized, the income earned
by an investment  in a  Trust is  assumed to be  reinvested each  week within  a
365-day  period. The "effective yield" will  be slightly higher than the "yield"
because of the  compounding effect  of this assumed  reinvestment. The  Tax-Free
Trust  and California Tax-Free Trust 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.

GENERAL INFORMATION
--------------------------------------------------------------------------------

VOTING RIGHTS

    All  shares of beneficial interest of a Trust are of $0.01 par value and are
equal as to  earnings, assets and  voting privileges. There  are no  conversion,
pre-emptive  or other  subscription rights.  In the  event of  liquidation, each
share of beneficial interest of a Trust is entitled to its portion of all of the
Trust's assets after all debts  and expenses have been  paid. The shares do  not
have cumulative voting rights.

    In  accordance with  each Trust's  Declaration of  Trust, the  Trustees of a
Trust will be elected  by a majority  shareholder vote at  the first meeting  of
shareholders  held following the  initial offering of the  shares of that Trust.
The Trustees  will  be elected  for  unlimited terms  at  the first  meeting  of
shareholders. The Trustees themselves have the power to alter the number and the
terms  of office of the Trustees (as  provided for in the Declaration of Trust),
and they may at any time lengthen or shorten their own terms or make their terms
of unlimited duration and appoint their own successors, provided that always  at
least  a majority of the  Trustees has been elected  by the shareholders of each
Trust. Under certain circumstances the Trustees may be removed by action of  the
Trustees.  The shareholders also  have the right  under certain circumstances to
remove the Trustees. The  voting rights of shareholders  are not cumulative,  so
that  holders of more than 50 percent of  the shares voting can, if they choose,
elect all Trustees  being elected,  while the  holders of  the remaining  shares
would  be unable to elect any Trustees. The Trust is not required to hold Annual
Meetings of Shareholders and in ordinary circumstances the Trust 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.

    The Declaration of Trust permits the  Trustees to authorize the creation  of
additional  series  of  shares  (the  proceeds of  which  would  be  invested in
separate, independently  managed portfolios)  and additional  classes of  shares
within  any  series (which  would be  used  to distinguish  among the  rights of
different categories of shareholders, as might be required by future regulations
or other unforeseen  circumstances). However, the  Trustees have not  authorized
any  such additional series  or classes of  shares and the  Trust has no present
intention to  add additional  series or  classes of  shares. Trustees  may  call
Special  Meetings  of Shareholders  for  action by  shareholder  vote as  may be
required by the Act or the Declaration of Trust.

                                      A-9
<PAGE>
    Under Massachusetts law, shareholders of a business trust may, under certain
circumstances, be held personally  liable as partners for  the obligations of  a
Trust.  The Declaration of  Trust contains an  express disclaimer of shareholder
liability for acts or obligations  of a Trust and  requires that notice of  such
disclaimer  be given in each instrument entered into or executed by a Trust. The
Declaration of Trust provides  for indemnification out  of the Trust's  property
for  any shareholder  held personally liable  for the obligations  of the Trust.
Thus, the  risk  of  a  shareholder  incurring  financial  loss  on  account  of
shareholder  liability is  limited to  circumstances in  which the  Trust itself
would be unable to meet its obligations. Given the nature of the Trusts'  assets
and  operations, the possibility of a Trust being unable to meet its obligations
is remote and, in the opinion of  Massachusetts counsel to the Trusts, the  risk
to Trust shareholders is remote.

CUSTODIAN

    The  Bank of New York, 90 Washington Street, New York, New York 10286 is the
Custodian of  the Trusts'  assets. The  Custodian has  no part  in deciding  the
Trusts'  investment policies or which securities are to be purchased or sold for
the Trusts' portfolios. Any of the  Trust's cash balances with the Custodian  in
excess  of $100,000 are unprotected by  Federal deposit insurance. Such balances
may, at times, be substantial.

    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 option 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  recent  report  by  the  Investment  Company Institute
Advisory Group on Personal Investing.

    SHAREHOLDER INQUIRIES.    All  inquiries  regarding  the  Trusts  should  be
directed  to the Trusts at  the telephone number or at  the address set forth on
the front cover of these Prospectuses.

                                      A-10
<PAGE>
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.

No dealer, salesman or any other person has been authorized to give any
information or to make any representations, other than those contained in these
Prospectuses or in the Statements of Additional Information, in connection with
the offer contained in these Prospectuses or in the Statements of Additional
Information and, if given or made, such other information or representations
must not be relied upon as having been authorized by the Trusts or the
Distributor. These Prospectuses and the Statements of Additional Information do
not constitute an offer by the Trusts or by the Distributor to sell or a
solicitation of any offer to buy any of the securities offered hereby in any
jurisdiction to any person to whom it is unlawful for the Trusts or the
Distributor to make such offer in such jurisdiction.

ACTIVE ASSETS
MONEY TRUST
ACTIVE ASSETS
TAX-FREE TRUST
ACTIVE ASSETS
CALIFORNIA TAX-FREE
TRUST
ACTIVE ASSETS
GOVERNMENT
SECURITIES TRUST

PROSPECTUSES
AUGUST 29, 1995

The enclosed Prospectuses describe four fully managed money market trusts.
Shares of the Trusts are offered directly to clients of Dean Witter and to
participants in the Active Assets-Registered Trademark- Account program of Dean
Witter Reynolds Inc.

Investors should be aware that the Active Assets Account service is not a bank
account. As with any investment in securities, the value of a shareholder's

investment in the Trusts may fluctuate.

Principal Office of the Trusts
Two World Trade Center
New York, New York 10048
                                                             [LOGO]


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