EATON VANCE MUTUAL FUNDS TRUST
497, 1999-05-06
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<PAGE>

{LOGO}              Investing
EATON VANCE           for the
Mutual Funds             21st
                      Century(R)
 
 
 
 
 
                        Eaton Vance Cash Management Fund
                         Eaton Vance Liquid Assets Fund
                          Eaton Vance Money Market Fund
                       Diversified money market mutual funds
 
                          Eaton Vance Tax Free Reserves
                A diversified tax-exempt money market mutual fund
 
 
 
                                Prospectus Dated
                                   May 1, 1999
 

The  Securities and Exchange  Commission  has not approved or disapproved  these
securities or determined  whether this  prospectus is truthful or complete.  Any
representation to the contrary is a criminal offense.

 
Information in this prospectus
                                           Page                             Page
- --------------------------------------------------------------------------------
Fund Summaries                               2    Sales Charges                8
Investment Objective & Principal                  Redeeming Shares             9
  Policies and Risks                         5    Shareholder Account
Management and Organization                  6      Features                   9
Valuing Shares                               7    Tax Information             10
Purchasing Shares                            7    Financial Highlights        11
- --------------------------------------------------------------------------------
 
 
 This prospectus contains important information about the Funds and the services
            available to shareholders. Please save it for reference.


<PAGE>
FUND SUMMARIES

        Eaton Vance Cash Management Fund . Eaton Vance Liquid Assets Fund
                          Eaton Vance Money Market Fund
 
Investment Objective and Principal Strategies.  Each Fund's investment objective
is to provide as high a rate of income as may be consistent with preservation of
capital and maintenance of liquidity.
 
The Funds  currently  invest their assets in a separate  diversified  registered
investment company with the same objective and policies. Permissible investments
include  various types of high quality,  U.S.  dollar  denominated  money market
instruments  of  domestic  and foreign  issuers,  such as  securities  issued or
guaranteed by the U. S.  government or its agencies and  instrumentalities,  and
high-quality, short-term obligations issued by banks and corporations.
 
Principal  Risk  Factors.  Each  Fund's  yield  will  change  as the  short-term
securities in its portfolio mature and the proceeds are reinvested in securities
with different interest rates.
 
In addition,  certain  events  could  reduce a Fund's  income level and/or share
price, such as: a sharp rise in prevailing  short-term  interest rates;  adverse
developments  in the banking  industry,  which issues or  guarantees  many money
market securities;  economic,  political or other developments affecting foreign
issuers of money market  securities;  changes in the credit  quality of issuers;
and default by a counterparty in a portfolio transaction.
 
An  investment  in a Fund is not insured or  guaranteed  by the Federal  Deposit
Insurance  Corporation or any other government agency.  Although each Fund seeks
to preserve  the value of an  investment  at $1.00 per share,  it is possible to
lose money by investing in a Fund.
 
Performance Information.  The following bar charts provide information about the
Funds' performance. Although past performance is no guarantee of future results,
this  performance  information  demonstrates  the risk  that  the  value of your
investment will change. The following returns are for each calendar year through
December  31, 1998 and do not reflect  sales  charges.  If the sales  charge was
reflected,  the returns  would be lower.  The total returns for the Money Market
Fund for the  period  prior to April 5, 1995  reflect  the  performance  of Cash
Management  Fund.  These  returns  have not been  adjusted  for  differences  in
expenses between the two funds.
 
                              Cash Management Fund

8.9%    7.8%    5.5%    3.1%    2.5%    3.5%    5.4%    4.8%    4.9%    4.8%
- --------------------------------------------------------------------------------
1989    1990    1991    1992    1993    1994    1995    1996    1997    1998

The Fund's  highest  quarterly  total return was 2.3% for the quarter ended June
30, 1989, and its lowest  quarterly  return was 0.5% for the quarter ended March
31, 1994. The Fund's  annualized and current  effective yields for the seven-day
period ended December 31, 1998 were 4.36% and 4.46%,  respectively.  For current
yield information call 1-800-225-6265.
 
                               Liquid Assets Fund

7.7%    6.7%    4.7%    3.0%    1.5%    3.3%    5.2%    4.4%    4.3%    4.2%
- --------------------------------------------------------------------------------
1989    1990    1991    1992    1993    1994    1995    1996    1997    1998
 
The  Fund's  highest  quarterly  total  return  was 2.1% for the  quarter  ended
December  31,  1989,  and its lowest  quarterly  return was 0.2% for the quarter
ended March 31, 1993. The Fund's annualized and current effective yields for the
seven-day period ended December 31, 1998 were 3.77% and 3.84%, respectively. For
current yield information call 1-800-225-6265.
 

                                        2
<PAGE>
                                Money Market Fund

8.9%    7.8%    5.5%    3.1%    2.5%    3.5%    4.5%    3.8%    3.9%    3.8%
- --------------------------------------------------------------------------------
1989    1990    1991    1992    1993    1994    1995    1996    1997    1998
 
The Fund's highest  quarterly  total return was 2.3%% for the quarter ended June
30, 1989, and its lowest  quarterly  return was 0.6% for the quarter ended March
31, 1994. The Fund's  annualized and current  effective yields for the seven-day
period ended December 31, 1998 were 3.41% and 3.47%,  respectively.  For current
yield information call 1-800-225-6265.
 
Fund Fees and Expenses. These tables describe the fees and expenses that you may
pay if you buy and hold shares.

Shareholder Fees
(fees paid directly from                Cash      Liquid Assets     Money Market
your investment)                        Fund          Fund              Fund
- --------------------------------------------------------------------------------
Maximum Sales Charge (Load)
  (as a percentage of
  offering price)                       None           None             None
Maximum Deferred Sales Charge
  (as a percentage of the
  lower of net asset value at
  time of purchase or time of
  redemption)                           None           5.00%            5.00%
Sales Charge Imposed on
  Reinvested Distributions              None           None             None
Exchange Fee                            None           None             None


Annual Fund Operating Expenses
(expenses that are deducted from        Cash      Liquid Assets     Money Market
Fund assets)                            Fund           Fund             Fund
- --------------------------------------------------------------------------------
Management Fees                         0.50%          0.50%            0.50%
Distribution and Service
  (12b-1) Fees*                         None           0.22%            0.85%
Other Expenses**                        0.35%          0.71%            0.51%
                                        -----          -----            -----
Total Annual Fund
  Operating Expenses                    0.85%          1.43%            1.86%

*    Long-term  shareholders  of Money  Market Fund shares may pay more than the
     economic equivalent of the front-end sales charge permitted by the National
     Association  of Securities  Dealers,  Inc. 
**   Other  Expenses for the Money Market Fund does not include an allocation of
     expenses to Eaton Vance in the amount of 0.04%.
 
Example. This Example is intended to help you compare the cost of investing in a
Fund with the cost of investing in other mutual funds.  The Example assumes that
you invest $10,000 in a Fund for the time periods  indicated and then redeem all
of your shares at the end of those  periods.  The Example also assumes that your
investment has a 5% return each year and that the operating  expenses remain the
same.  Although  your  actual  costs  may be  higher  or  lower,  based on these
assumptions your costs would be:
 
                                    1  Year    3 Years    5 Years    10 Years
- -------------------------------------------------------------------------------
 Cash Fund                          $    87    $   271    $   471      $ 1,049
 Liquid Assets Fund                 $   646    $   852    $   982      $ 1,713
 Money Market Fund                  $   689    $   985    $ 1,206      $ 2,180

You would pay the following expenses if you did not redeem your shares:
 
                                    1 Year     3 Years    5 Years    10 Years
- --------------------------------------------------------------------------------
 Cash Fund                          $   87     $   271    $   471      $ 1,049
 Liquid Assets Fund                 $  146     $   452    $   782      $ 1,713
 Money Market Fund                  $  189     $   585    $ 1,006      $ 2,180


                                        3
<PAGE>
                          EATON VANCE TAX FREE RESERVES
 
Investment Objective and Principal  Strategies.  The Fund's investment objective
is to provide a means whereby investors may earn as high a rate of income exempt
from regular federal income tax as may be consisitent  with the  preservation of
capital and maintenance of liquidity.
 
The Fund seeks to acheive its objective by investing in a diversified  portfolio
of high quality obligations, including bonds, notes and commercial paper, issued
by or on behalf of states,  territories and possessions of the United States and
their political subdivisions,  agencies and instrumentalities,  and the District
of Columbia, the interest from which is exempt from regular federal income tax.
 
Principal  Risk  Factors.  The  Fund's  yield  will  change  as  the  short-term
securities it holds mature and the proceeds are  reinvested  in securities  with
different interest rates.
 
In addition, certain events could reduce income or share price, such as: a sharp
rise in prevailing  short-term interest rates;  adverse  developments  affecting
municipal issuers, including tax, legislative or political initiatives;  changes
in the credit quality of issuers or the providers of credit support; and default
by a counterparty to portfolio transactions.
 
An investment  in the Fund is not insured or  guaranteed by the Federal  Deposit
Insurance Corporation or any other government agency. Although the Fund seeks to
preserve the value of an investment  at $1.00 per share,  it is possible to lose
money by investing in the Fund.
 
Performance  Information.  The following bar chart and table provide information
about the Fund's  performance.  Although  past  performance  is no  guarantee of
future results,  this  performance  information  demonstrates  the risk that the
value  of your  investment  will  change.  The  following  returns  are for each
calendar year through December 31, 1998.

5.3%     3.9%     2.4%     1.9%     2.4%     3.5%     3.1%     3.2%     3.1%
- --------------------------------------------------------------------------------
1990     1991     1992     1993     1994     1995     1996     1997     1998
 
The Fund's  highest  quarterly  total return was 1.5% for the quarter ended June
30, 1989, and its lowest  quarterly  return was 0.5% for the quarter ended March
31, 1994. The Fund's  annualized and current  effective yields for the seven-day
period  ended  December  31,  1998  were  3.05%  and  3.09%,  respectively.  The
taxable-equivalent  current and effective  yields for the seven-day period ended
December  31,  1998 were 4.42% and 4.73%,  respectively  (assuming a federal tax
rate of 31%). For current yield information call 1-800-225-6265.
 
Fund Fees and Expenses. These tables describe the fees and expenses that you may
pay if you buy and hold shares.
 
 
Shareholder Fees                                                 Tax Free
(fees paid directly from your investment)                        Reserves
- --------------------------------------------------------------------------------
Maximum Sales Charge (Load)
  (as a percentage
  of offering price)                                               None
Maximum Deferred Sales Charge 
  (as a percentage of the lower of 
  net asset value at time of purchase 
  or time of redemption)                                           None
Sales Charge Imposed on 
  Reinvested Distributions                                         None
Exchange Fee                                                       None
 
Annual Fund Operating Expenses                                   Tax Free
(expenses that are deducted from Fund assets)                    Reserves
- --------------------------------------------------------------------------------
Management Fees*                                                   0.50%
Distribution and Service (12b-1) Fees                              None
Other Expenses                                                     0.26%
                                                                   -----
Total Annual Fund Operating Expenses                               0.76% 
 
*    Management  Fees do not  include  an  expense  reduction  of  0.28%  by the
     investment adviser.


<PAGE>
Example.  This  Example is intended to help you compare the cost of investing in
the Fund with the cost of investing in other mutual funds.  The Example  assumes
that you invest  $10,000  in the Fund for the time  periods  indicated  and then
redeem all of your shares at the end of those periods.  The Example also assumes
that your  investment has a 5% return each year and that the operating  expenses
remain the same.  Although  your actual  costs may be higher or lower,  based on
these assumptions your costs would be:
 
                                       1  Year    3 Years    5 Years    10 Years
- --------------------------------------------------------------------------------
Tax Free Reserves                      $    78    $   243    $   422    $   942


                                        4
<PAGE>
INVESTMENT OBJECTIVES & PRINCIPAL POLICIES AND RISKS
 
Cash  Management  Fund,  Liquid  Assets Fund and Money Market Fund.  Each Fund's
investment objective is to provide as high a rate of income as may be consistent
with  preservation of capital and maintenance of liquidity.  Each Fund currently
seeks  to  meet  its  investment  objective  by  investing  in  Cash  Management
Portfolio,  a separate open-end  investment  company that has the same objective
and policies.  Each Fund's  investment  objective and policies may be changed by
the Trustees without shareholder approval;  as a matter of policy,  however, the
Trustees would not materially change the investment  objective of a Fund without
shareholder approval.  Each Fund seeks to maintain a constant net asset value of
$1 per share, although there can be no assurance it will be able to do so.
 
The Portfolio  invests in high  quality,  U.S.  dollar-denominated  money market
instruments  of  domestic  and  foreign  issuers,   including  U.S.   Government
securities and prime commercial paper. When appropriate,  the Portfolio may also
invest in high-grade short-term obligations other than prime commercial paper as
well as  certificates  of deposit,  bankers'  acceptances  and other  short-term
securities  issued  by  domestic  or  foreign  banks  or their  subsidiaries  or
branches.  The  Portfolio may invest  without  limit in U.S.  dollar-denominated
obligations  of foreign  issuers,  including  foreign  banks.  Such  investments
involve  special  risks.  These  include  unfavorable   political  and  economic
developments,  possible withholding taxes, seizure of foreign deposits, interest
limitations  or other  governmental  restrictions  which might affect payment of
principal  and  interest.  Additionally,  there may be less  public  information
available  about foreign banks and their branches.  Foreign  branches of foreign
banks are not regulated by U.S. banking authorities, and generally are not bound
by accounting,  auditing and financial  reporting  standards  comparable to U.S.
banks.  The  Portfolio  does not limit the  amount  of its  assets  which can be
invested in one type of instrument or in any foreign country.
 
Tax Free Reserves.  The Fund's  investment  objective is provide a means whereby
investors may earn as high a rate of income exempt from regular  federal  income
tax as may be consistent  with the  preservation  of capital and  maintenance of
liquidity.  The Fund's  investment  objective and policies may be changed by the
Trustees  without  shareholder  approval;  as a matter of policy,  however,  the
Trustees  would not  materially  change  the  investment  objective  of the Fund
without  shareholder  approval.  The Fund seeks to maintain a constant net asset
value of $1 per share,  although there can be no assurance it will be able to do
so.
 
The Fund seeks to achieve its  objective by investing at least 85% of its assets
in a diversified  portfolio of high quality obligations,  including bonds, notes
and commercial paper, issued on behalf of states, territories and possessions of
the   United   States   and   their   political   subdivisions,   agencies   and
instrumentalities,  and the  District of Columbia,  the  interest  from which is
exempt from federal income tax. The Fund may acquire  stand-by  commitments with
respect to portfolio  securities  and,  with  respect to 10% of net assets,  may
purchase shares of unaffiliated investment companies with the same objective.
 
A portion of the  dividends  paid by the Fund may be  subject to federal  income
tax,  and  dividends  may be  subject to state and local  taxes.  As a matter of
fundamental  policy which may not be changed unless  authorized by a shareholder
vote, the Fund may not purchase any  securities  which would cause more than 20%
of the value of its total  assets to be invested in  securities  the interest on
which is not exempt from federal income tax.  Interest income from certain types
of municipal  obligations may be subject to the federal  alternative minimum tax
(the "AMT"). On December 31, 1998, the Fund had 14.7% of its net assets invested
in such  obligations.  Distributions to corporate  investors of certain interest
income may also be subject to the AMT.
 
Common  Investment  Practices.  The  Portfolio and Tax Free Reserves will invest
only in U.S. dollar-denominated money market instruments meeting credit criteria
which  the  Trustees  believe  present  minimal  credit  risk,  and that are (i)
short-term  obligations  rated  in one of the  two  highest  short-term  ratings
categories by at least two nationally recognized rating services (or if only one
rating  service  has rated  the  security,  by that  service),  or (ii)  unrated
securities  determined by the  investment  adviser to be of comparable  quality.
Each of the Portfolio  and Tax Free  Reserves  will  maintain a  dollar-weighted
average  maturity  of 90 days or less and will not  invest  in  securities  with
remaining  maturities of more than 397 days. The Portfolio and Tax Free Reserves
may invest in variable or  floating-rate  securities  some of which  provide for
periodic  recovery of  principal  on demand.  Under  certain  conditions,  these
securities  may be  deemed  to  have  remaining  maturities  equal  to the  time
remaining until the next interest adjustment date or the date on which principal
can be  recovered  on  demand.  The  Portfolio  will  not  invest  more  than 5%
(determined at the time of  investment) of its total assets in securities  rated
in  the  second  highest   short-term  rating  category  or  comparable  unrated
securities.  Tax Free Reserves has a similar 5% limit on  investments in certain
municipal  obligations which rely on the credit of a corporate  entity.  Neither
the Portfolio  nor Tax Free Reserves will purchase  securities of any issuer if,
immediately  thereafter,  more than 5% of its total  assets would be invested in
securities of that issuer.
 
Consistent with their investment objectives, the Portfolio and Tax Free Reserves
will attempt to maximize  yields by portfolio  trading and by buying and selling
portfolio investments in anticipation of or in response to changing economic and

 
                                        5
<PAGE>
money market conditions and trends. The Portfolio and Tax Free Reserves may also
invest  to take  advantage  of what  their  investment  advisers  believe  to be
temporary  disparities  in yields of  different  segments of the money market or
among particular instruments within the same segment of the market.
 
The  Portfolio  and Tax Free  Reserves may purchase  securities on a when-issued
basis and for future delivery by means of "forward  commitments".  The Portfolio
may  enter  into  repurchase  agreements.   These  transactions  must  be  fully
collateralized  at all times, but involve some risk if the  counterparty  should
default on its  obligations  or if the  Portfolio is delayed or  prevented  from
recovering the collateral.

   
Each of the Portfolio  and Tax Free Reserves may borrow  amounts up to one-third
of the value of its total assets (including borrowings),  but it will not borrow
more than 5% of the  value of its total  assets  except  to  satisfy  redemption
requests  or for other  temporary  purposes.  Such  borrowings  would  result in
increased  expense and, while they are outstanding,  would magnify the potential
for  increases or decreases in the value of Fund shares.  Neither the  Portfolio
nor Tax Free Reserves  will  purchase  additional  investment  securities  while
outstanding borrowings exceed 5% of the value of total assets.
    

Like most  mutual  funds,  the  Funds and the  Portfolio  rely on  computers  in
conducting daily business and processing information. There is a concern that on
January 1, 2000 some computer  programs will be unable to recognize the new year
and as a consequence  computer  malfunctions  will occur.  Eaton Vance is taking
steps that it believes are reasonably designed to address this potential problem
and to obtain  satisfactory  assurance from other service providers to the Funds
and the  Portfolio  that they are also taking steps to address the issue.  There
can,  however,  be no assurance that these steps will be sufficient to avoid any
adverse  impact on the Funds and the  Portfolio or  shareholders.  The Year 2000
concern may also adversely  impact  issuers of securities  held by a Fund or the
Portfolio  and the  markets  on which  these  securities  trade.  The  foregoing
statement is subject to the Year 2000 Information and Readiness  Disclosure Act,
which may protect  Eaton Vance and the Funds and the  Portfolio  from  liability
arising from the statement.
 
MANAGEMENT AND ORGANIZATION
 
Management.  Each  Portfolio's  investment  adviser  is  Boston  Management  and
Research  ("BMR"),  a subsidiary  of Eaton Vance  Management,  255 State Street,
Boston, Massachusetts 02109. Eaton Vance has been managing assets since 1924 and
managing  mutual funds since 1931.  Eaton Vance and its  subsidiaries  currently
manage over $36  billion on behalf of mutual  funds,  institutional  clients and
individuals.
 
BMR manages  the  investments  of the  Portfolio  and  provides  related  office
facilities and  personnel.  Under its  investment  advisory  agreement with Cash
Management  Portfolio,  BMR  receives  a  monthly  advisory  fee of  1/24  of 1%
(equivalent  to  0.50%  annually)  of the  average  daily  net  assets  of  Cash
Management  Portfolio.  For the fiscal year ended  December 31,  1998,  the Cash
Management  Portfolio paid BMR advisory fees  equivalent to 0.50% of its average
daily net assets.
 
Eaton Vance manages the  investments  of Tax Free Reserves and provides  related
office facilities and personnel.  Under its investment  advisory  agreement with
the  Trust on  behalf  of Tax Free  Reserves,  Eaton  Vance  receives  a monthly
advisory fee of 1/24 of 1% (equivalent  to 0.50%  annually) of the average daily
net assets of Tax Free  Reserves.  For the fiscal year ended  December 31, 1998,
absent a fee reduction in the amount of 0.28%, Tax Free Reserves would have paid
Eaton Vance advisory fees equivalent to .50% of its average daily net assets.
 
Michael  B. Terry is the  portfolio  manager  of the Cash  Management  Portfolio
(since it commenced  operations).  He also manages other Eaton Vance portfolios,
has been an Eaton  Vance  portfolio  manager for more than 5 years and is a Vice
President of Eaton Vance and BMR.
 
William H.  Ahern,  Jr. is the  portfolio  manager of Tax Free  Reserves  (since
1993).  He also manages  other Eaton Vance  portfolios,  has been an Eaton Vance
portfolio  manager for more than 5 years and is a Vice  President of Eaton Vance
and BMR.
 
The  investment  advisers and Tax Free Reserves and the  Portfolio  have adopted
Codes of Ethics governing  personal  securities  transactions.  Under the Codes,
Eaton Vance  employees may purchase and sell  securities  (including  securities
held by Tax Free Reserves and the  Portfolio)  subject to certain  pre-clearance
and reporting requirements and other procedures.
 
Eaton Vance serves as administrator of the Cash,  Liquid Assets and Money Market
Funds,  providing  the Funds with  administrative  services  and related  office
facilities.  Eaton  Vance  does  not  currently  receive  a fee for  serving  as
administrator.
 
Organization.  Each  Fund is a series  of Eaton  Vance  Mutual  Funds  Trust,  a
Massachusetts  business trust. The Portfolio and Tax Free Reserves will not hold
annual  shareholder  meetings,  but may hold  special  meetings for matters that
require  shareholder  approval  (like electing or removing  trustees,  approving
management  contracts or changing  investment  policies that may only be changed
with  shareholder  approval).  Because the Cash,  Liquid Assets and Money Market
Funds  invest in the  Portfolio,  it may be asked to vote on  certain  Portfolio
matters  (like  changes  in certain  Portfolio  investment  restrictions).  When
necessary, the Cash, Liquid Assets and Money Market Funds will hold a meeting of
shareholders  to consider the Portfolio  matter and then vote their  interest in
the  Portfolio in proportion  to the votes cast by its  shareholders.  The Cash,
Liquid  Assets and Money  Market Funds can  withdraw  from the  Portfolio at any
time.
 

                                        6
<PAGE>
Because the Funds use this combined prospectus,  a Fund could be held liable for
a  misstatement  or omission  made about  another  Fund.  The  Trust's  Trustees
considered this in approving the use of a combined prospectus.
 
VALUING SHARES
 
Each Fund values its shares once each day only when the New York Stock  Exchange
is open for  trading  (typically  Monday  through  Friday),  as of the  close of
regular trading on the Exchange  (normally 4:00 p.m. eastern time). The price of
Fund  shares is their net asset  value,  which for the Cash,  Liquid  Assets and
Money Market Funds is derived from Portfolio  holdings.  The  investments of the
Portfolio and the Funds are valued at amortized  cost  according to a Commission
rule.  The Portfolio and the Funds will not normally  have  unrealized  gains or
losses so long as they value their investments by the amortized cost method.
 
When  purchasing  or  redeeming  Fund  shares,   your  investment   dealer  must
communicate your order to the principal  underwriter by a specific time each day
in order  for the  purchase  price or the  redemption  price to be based on that
day's net asset value per share. It is the investment dealer's responsibility to
transmit orders promptly. Each Fund may accept purchase and redemption orders as
of the time of their receipt by certain  investment dealers (or their designated
intermediaries).
 
PURCHASING SHARES

The Cash Fund and Tax Free Reserves are offered to  shareholders in exchange for
their Class A shares of the Eaton Vance Group of Funds. The Money Market Fund is
offered to  shareholders in exchange for their Class B and Class C shares of the
Eaton  Vance  Group of  Funds.  (The  Money  Market  Fund may not be a  suitable
investment  for investors  who do not intend to use it as an exchange  vehicle.)
The  Liquid  Assets  Fund is  currently  closed to new  investments,  whether by
exchange or initial subscription.
 
Your initial investment must be at least $1,000.  After your initial investment,
additional investments of $50 or more may be made at any time.
 
You may purchase Fund shares  through your  investment  dealer  (which  includes
brokers,  dealers and other financial institutions) who may charge you a fee for
executing  the  purchase  for  you  or  by  requesting  your  bank  to  transmit
immediately  available  funds  (Federal  Funds) by wire to the address set forth
below.  The Fund may suspend the sale of its shares at any time and any purchase
order may be refused.
 
To make an initial  investment by wire, you must first  telephone the Fund Order
Department  at  800-225-6265  (extension  3) to advise of your  action and to be
assigned an account  number.  Failure to call will delay the order.  The Account
Application form which accompanies this prospectus must be promptly forwarded to
the transfer agent.  Additional  investments may be made at any time through the
same wire procedure.  The Fund Order  Department must be advised by telephone of
each transmission. Wire funds to:
 
     ABA #011001438
     Federal Reserve Bank of Boston
     A/C Investors Bank & Trust Company
     Further Credit Eaton Vance [name of ] Fund
     A/C # [Insert your account number - see below]
 
Transactions in money market instruments  normally require immediate  settlement
in federal  funds.  The Funds intend at all times to be as fully  invested as is
feasible in order to maximize  earnings.  Accordingly,  purchase  orders will be
executed at the net asset value next  determined  after their  receipt by a Fund
only if the Fund has received  payment in cash or in federal funds.  If remitted
in other than the foregoing  manner,  such as by money order or personal  check,
purchase  orders  will be  executed  as of the close of  business  on the second
Boston  business  day after  receipt.  Information  on how to  procure a Federal
Reserve Draft or to transmit federal funds by wire is available at banks. A bank
may charge for these services.
 
You may  also  make  automatic  investments  of $50 or more  each  month or each
quarter from your bank account.  You can establish bank  automated  investing on
the  account  application  or by calling  1-800-262-1122.  The  minimum  initial
investment  amount  and Fund  policy  of  redeeming  accounts  with low  account
balances are waived for bank  automated  investing  accounts  and certain  group
purchase plans.
 

                                        7
<PAGE>
SALES CHARGES
 
Contingent  Deferred  Sales  Charge.  Each Fund is  subject to a CDSC on certain
redemptions.  Shares  of the  Cash  Fund and Tax Free  Reserves  acquired  in an
exchange  for Class A shares of an Eaton  Vance  fund  subject to a CDSC will be
subject  to the CDSC  applicable  to the  exchanged  shares at the time of their
purchase,  unless such  redemption  is in connection  with another  exchange for
shares subject to such a charge.  Liquid Assets and Money Market Fund shares are
subject to the following CDSC schedule:
 
Year of Redemption After Purchase                                          CDSC
- --------------------------------------------------------------------------------
First or Second                                                            5%
Third                                                                      4%
Fourth                                                                     3%
Fifth                                                                      2%
Sixth                                                                      1%
Seventh or following                                                       0%
 
The CDSC is based on the lower of the net asset value at the time of purchase or
the  time  of  redemption.   Shares   acquired   through  the   reinvestment  of
distributions  are exempt from the CDSC.  Redemptions are made first from shares
that are not subject to a CDSC.

The  CDSC  is  waived  for  redemptions  pursuant  to  a  Withdrawal  Plan  (see
"Shareholder  Account Features") and in connection with certain redemptions from
tax-sheltered  retirement plans. Call  1-800-225-6265  for details.  The CDSC is
also waived following the death of all beneficial owners of shares,  but only if
the redemption is requested within one year after death (a death certificate and
other applicable documents may be required).
 
Distribution  and Service Fees. Each of the Money Market and Liquid Assets Funds
have  adopted a plan under Rule 12b-1 that  allows the Fund to pay  distribution
fees for the sale and  distribution of shares  (so-called  "12b-1 fees").  Money
Market Fund  shares pay  distribution  fees of .75% of average  daily net assets
annually.  Liquid  Assets Fund shares pay a service fee of .25% of average daily
net assets annually.  Because these fees are paid from Fund assets on an ongoing
basis,  they will increase your cost over time and may cost you more than paying
other  types of sales  charges.  The Money  Market  Fund pays  service  fees for
personal and/or account  services not exceeding .15% of average daily net assets
annually.  Both Funds only pay service fees on shares that have been outstanding
for 12 months.
 

                                        8
<PAGE>
REDEEMING SHARES
 
You can redeem shares in any of the following ways:

  By Mail               Send your request to the transfer agent along with any
                        certificates and stock powers. The request must be
                        signed exactly as your account is registered and
                        signature guaranteed.  You can obtain a signature
                        guarantee at certain banks, savings and loan
                        institutions, credit unions, securities dealers,
                        securities exchanges, clearing agencies and registered
                        securities associations.  You may be asked to provide
                        additional documents if your shares are registered in
                        the name of a corporation, partnership or fiduciary.
 
  By Wire               If you have given complete written authorization in
                        advance you may request that redemption proceeds of
                        $1,000 or more be wired directly to your bank account.
                        The bank designated may be any bank in the United
                        States.  The request may be made by letter or telephone
                        to the Fund Order Department at 800-225-6265 (extension
                        3).  You may be required to pay the costs of such
                        transaction; however, no costs are currently charged.
                         The Fund may suspend or terminate the expedited payment
                        procedure upon at least 30 days notice.
 
  By Telephone          You can redeem up to $50,000 b y calling the transfer
                        agent at 1-800-262-1122 on Monday through Friday, 9:00
                        a.m. to 4:00 p.m. (eastern time). Proceeds of a
                        telephone redemption can be mailed only to the account
                        address.  Shares held by corporations, trusts or certain
                        other entities, or subject to fiduciary arrangements,
                        cannot be redeemed by telephone.
 
  By Check              If you hold shares of the Cash Fund and Tax Free
                        Reserves, you may redeem shares by check.  You may
                        obtain the proper forms from Boston Safe Deposit and
                        Trust Company.  The checks may be made payable by you to
                        the order of any person in any amount of $500 or more.
 
  Through an Investment 
  Dealer                 Your investment dealer is responsible for transmitting
                         your order promptly.  A dealer may charge a fee for 
                         this service.
 
If you redeem shares, your redemption price will be based on the net asset value
per  share  next  computed  after  the  redemption  request  is  received.  Your
redemption  proceeds  will be paid in cash  within  seven  days,  reduced by the
amount  of any  applicable  CDSC  and any  federal  income  tax  required  to be
withheld.  Payments  will be sent by mail  unless  you  complete  the Bank  Wire
Redemptions section of the account application.
 
If you recently  purchased shares, the proceeds of a redemption will not be sent
until the purchase check (including a certified or cashier's check) has cleared.
If the purchase check has not cleared,  redemption proceeds may be delayed up to
15 days from the purchase  date.  If your account  value falls below $750 (other
than due to market  decline),  you may be asked to either add to your account or
redeem it within 60 days.  If you take no action,  your account will be redeemed
and the proceeds sent to you.
 
SHAREHOLDER ACCOUNT FEATURES
 
Distributions. You may have your Fund distributions paid in one of the following
ways:

* Full Reinvest 
  Option            Dividends  and capital  gains are  reinvested  in additional
                    shares.  This  option will be assigned if you do not specify
                    an option. 
* Cash Option       Dividends and capital gains are paid in cash.
 
Information from the Funds. From time to time, you may be mailed the following:
 
*    Annual  and  Semi-Annual  Reports,  containing  performanceinformation  and
     financial statements.
*    Periodic  account  statements,  showing  recent  activity  and total  share
     balance.
*    Form 1099 and tax information needed to prepare your income tax returns.
*    Proxy materials, in the event a shareholder vote is required.
*    Special notices about significant events affecting your Fund.
 

                                        9
<PAGE>
Tax-Sheltered  Retirement Plans. Cash and Money Market Fund shares are available
for purchase in connection with certain  tax-sheltered  retirement  plans.  Call
1-800-225-6265  for  information.  Distributions  will be invested in additional
shares for all tax-sheltered retirement plans.
 
Exchange Privilege. You may exchange your Cash Fund and Tax Free Reserves shares
for Class A shares of another  Eaton Vance fund.  You may  exchange  your Liquid
Assets and Money  Market Fund  shares for Class B shares of another  Eaton Vance
fund.  Exchanges are generally made at net asset value. If your Liquid Assets or
Money Market Fund shares were acquired in exchange for Class C shares of another
Eaton Vance Fund, such shares may be exchanged only for shares of one or more of
such  funds.  If your shares are  subject to a CDSC,  the CDSC will  continue to
apply to your new shares at the same CDSC rate.  For purposes of the CDSC,  your
shares will continue to age from the date of your original purchase.
 
Before exchanging,  you should read the prospectus of the new fund carefully. If
you wish to exchange  shares,  you may write to the transfer  agent  (address on
back  cover)  or call  1-800-262-1122.  Periodic  automatic  exchanges  are also
available.  The exchange  privilege may be changed or  discontinued at any time.
You will receive 60 days' notice of any material  change to the privilege.  This
privilege  may not be used for  "market  timing".  If an  account  (or  group of
accounts) makes more than two round-trip  exchanges within 12 months, it will be
deemed to be market timing.  The exchange privilege may be terminated for market
timing accounts.
 
Telephone  Transactions.  The transfer agent and the principal  underwriter have
procedures in place to authenticate  telephone  instructions  (such as verifying
personal  account  information).  As long as the  transfer  agent and  principal
underwriter   follow  these  procedures,   they  will  not  be  responsible  for
unauthorized  telephone  transactions  and you bear the  risk of  possible  loss
resulting from telephone transactions. Telephone instructions are tape recorded.
As long as the net asset value of Fund shares is  maintained at $1.00 per share,
an exchange will not result in a taxable gain or loss.
 
"Street Name" Accounts. If your shares are held in a "street name" account at an
investment  dealer,  that dealer (and not the Fund or its  transfer  agent) will
perform all  recordkeeping,  transaction  processing and distribution  payments.
Because the Fund will have no record of your  transactions,  you should  contact
your investment  dealer to purchase,  redeem or exchange shares, to make changes
in your account, or to obtain account  information.  The transfer of shares in a
"street  name"  account to an account  with another  investment  dealer or to an
account  directly  with the Fund  involves  special  procedures  and you will be
required  to  obtain  historical  information  about  your  shares  prior to the
transfer. Before establishing a "street name" account with an investment dealer,
you should determine whether that dealer allows reinvestment of distributions in
"street name" accounts.
 
Withdrawal  Plan.  You may redeem  Cash Fund and Tax Free  Reserves  shares on a
regular quarterly basis by establishing a systematic withdrawal plan. Withdrawal
amounts for Liquid Assets and Money Market Fund shareholders may also be made on
a regular quarterly basis,  provided the aggregate amount of the withdrawal does
not exceed 12% annually  (such amount will not be subject to a CDSC).  A minimum
account size of $5,000 is required to establish a systematic withdrawal plan.
 
Distribution  Investment  Option.  In addition to the  distribution  options set
forth above, distributions may be invested in additional shares of another Eaton
Vance fund. Before selecting this option,  you should obtain a prospectus of the
other Eaton Vance fund and consider its objectives and policies carefully.
 
Account Questions.  If you have any questions about your account or the services
available,  please call Eaton Vance Shareholder  Services at 1-800-225-6265,  or
write to the transfer agent (see back cover for address).
 
TAX INFORMATION
 
Each Fund declares dividends daily and pays distributions each month.  Long-term
capital gains, if any, will be distributed at least annually. Distributions from
Cash,  Liquid Assets and Money Market Fund (and taxable  distributions  from Tax
Free Reserves,  if any) of any taxable  income and net short-term  capital gains
will be taxable as ordinary income. Distributions of any long-term capital gains
are taxable as such.
 
Distributions  designated by Tax Free Reserves as  "exempt-interest  dividends",
whether  paid  in cash or  reinvested  in  additional  shares,  ordinarily  will
constitute  tax-exempt  income to you.  Distributions  of  interest  on  certain
municipal  obligations  are a tax  preference  item  under  the  AMT  provisions
applicable to individuals and corporations.
 
Shareholders  should consult with their advisers concerning the applicability of
state, local and other taxes to an investment.
 

                                       10
<PAGE>
FINANCIAL HIGHLIGHTS
 
The  financial  highlights  are  intended  to help  you  understand  the  Fund's
financial performance for the past five years. Certain information in the tables
reflects the financial results for a single Fund share. The total returns in the
tables  represent  the  rate an  investor  would  have  earned  (or  lost) on an
investment  in the Fund  (assuming  reinvestment  of all  distributions  and not
taking  into  account a sales  charge).  This  information  has been  audited by
PricewaterhouseCoopers    LLP,   independent   accountants.    The   report   of
PricewaterhouseCoopers LLP and each Fund's financial statements are incorporated
herein by  reference  and included in the annual  report,  which is available on
request.
 
<TABLE>
<CAPTION>
                                        CASH MANAGEMENT FUND
                        -------------------------------------------------------
                                      YEAR ENDED DECEMBER 31,
                        -------------------------------------------------------
                          1998       1997       1996       1995        1994
                        -------------------------------------------------------
<S>                     <C>        <C>        <C>        <C>        <C>
  Net asset value -
  Beginning of year     $   1.00   $   1.00   $   1.00   $   1.00    $   1.00
                        --------   --------   --------   --------    --------
  Income from
  operations
  Net investment
  income                $ 0.0470   $ 0.0478   $ 0.0470   $ 0.0522    $ 0.0345
  Less distributions
  From net investment
  income                $(0.0470)  $(0.0478)  $(0.0470)  $(0.0522)   $(0.0345)
  Net asset value -
  End of year           $   1.00   $   1.00   $   1.00   $   1.00    $   1.00
                        --------   --------   --------   --------    --------
  Total return(1)           4.78%      4.89%      4.82%      5.35%       3.49%
  Ratios/Supplemental
  Data
  Net assets, end of
  year (000's omitted)  $ 96,244   $146,743   $151,691   $155,251    $111,622
  Ratios (as a
  percentage of
  average daily net
  assets):
   Expenses(2)              0.85%      0.78%      0.74%      0.74%       0.84%
   Net investment
    income                  4.69%      4.79%      4.70%      5.22%       3.40%
</TABLE>
 
<TABLE>
<CAPTION>
                                         LIQUID ASSETS FUND
                        -------------------------------------------------------
                                      YEAR ENDED DECEMBER 31,
                        -------------------------------------------------------
                          1998       1997       1996       1995        1994
                        -------------------------------------------------------
<S>                     <C>        <C>        <C>        <C>        <C>
  Net asset value -
  Beginning of year     $   1.00   $   1.00   $   1.00   $   1.00    $   1.00
                        --------   --------   --------   --------    --------
  Income from
  operations
  Net investment
  income                $ 0.0410   $ 0.0420   $ 0.0432   $ 0.0505    $ 0.0328
  Less distributions
  From net investment
  income                $(0.0410)  $(0.0420)  $(0.0432)  $(0.0505)   $(0.0328)
  Net asset value -
  End of year           $   1.00   $   1.00   $   1.00   $   1.00    $   1.00
                        --------   --------   --------   --------    --------
  Total return(1)           4.20%      4.29%      4.41%      5.16%       3.29%
  Ratios/Supplemental
  Data
  Net assets, end of
  year (000's omitted)  $  7,974   $ 13,001   $ 19,910   $ 34,026    $118,599
  Ratios (as a
  percentage of
  average daily net
  assets):
   Expenses(2)              1.43%      1.35%      1.13%      0.91%       0.94%
   Net investment
    income                  4.14%      4.21%      4.31%      5.11%       3.55%
</TABLE>
 
                                                   (See footnotes on last page.)
 
 
                                       11
<PAGE>
FINANCIAL HIGHLIGHTS (continued)
<TABLE>
<CAPTION>
                                              MONEY MARKET FUND
                                  ---------------------------------------------
                                           YEAR ENDED DECEMBER 31,
                                  ---------------------------------------------
                                    1998       1997       1996       1995*
                                  ---------------------------------------------
<S>                               <C>        <C>        <C>        <C>
  Net asset value - Beginning of
  year                            $   1.00   $   1.00   $   1.00    $   1.00
                                  --------   --------   --------    --------
  Income from operations
  Net investment income           $ 0.0369   $ 0.0381   $ 0.0370    $ 0.0312
  Less distributions
  From net investment income      $(0.0369)  $(0.0381)  $(0.0370)   $(0.0312)
  Net asset value - End of year   $   1.00   $   1.00   $   1.00    $   1.00
                                  --------   --------   --------    --------
  Total return(1)                     3.75%      3.88%      3.77%       3.17%
  Ratios/Supplemental Data+
  Net assets, end of year (000's
  omitted)                        $ 34,292   $ 23,809   $ 31,250    $ 12,951
  Ratios (as a percentage of
  average daily net assets):
   Expenses(2)                        1.82%      1.73%      1.73%       1.68%+
   Net investment income              3.70%      3.83%      3.70%       4.19%+
</TABLE>
+    The operating expenses of the Fund may reflect an allocation of expenses to
     the  Administrator.  Had such  action  not been  taken,  the ratios and net
     investment income per share would have been as follows:
<TABLE>
<CAPTION>
<S>                                                    <C>       <C>       <C>       <C>
  Ratios (as a percentage of average daily net
  assets):
   Expenses(2)                                            1.86%     1.82%     1.76%      1.85%+
   Net investment income                                  3.66%     3.74%     3.66%      4.03%+
  Net investment income per share                      $0.0365   $0.0372   $0.0367    $0.0300
</TABLE>
 
                                                   (See footnotes on last page.)
 
 
                                       12
<PAGE>
FINANCIAL HIGHLIGHTS (continued)
<TABLE>
<CAPTION>
                                         TAX FREE RESERVES
                        -------------------------------------------------------
                                      YEAR ENDED DECEMBER 31,
                        -------------------------------------------------------
                          1998       1997       1996       1995        1994
<S>                     <C>        <C>        <C>        <C>        <C>
  Net asset value -
  Beginning of year     $ 1.0000   $ 1.0000   $ 1.0000   $ 1.0000    $ 1.0000
                        --------   --------   --------   --------   ---------
  Income (loss) from
  operations
  Net investment
  income                $ 0.0305   $ 0.0312   $ 0.0303   $ 0.0347    $ 0.0235
  Total Income from
  operations            $ 0.0305   $ 0.0312   $ 0.0303   $ 0.0347    $ 0.0235
  Less distributions
  From net investment
  income                $(0.0305)  $(0.0312)  $(0.0303)  $(0.0347)   $(0.0235)
                        $(0.0305)  $(0.0312)  $(0.0303)  $(0.0347)   $(0.0235)
  Total distributions
  Net asset value -
  End of year           $ 1.0000   $ 1.0000   $ 1.0000   $ 1.0000    $ 1.0000
                        --------   --------   --------   --------    --------
  Total return(1)           3.09%      3.16%      3.08%      3.53%       2.36%
  Ratios/Supplemental
  Data+
  Net assets, end of
  year (000's omitted)  $ 47,272   $ 33,960   $ 23,355   $ 23,912    $ 29,021
  Ratios (as a
  percentage of
  average daily net
  assets):
   Expenses(3)              0.48%      0.52%      0.33%      0.34%       0.47%
   Expenses after
    custodian fee
    reduction(3)            0.40%      0.46%      0.27%        --          --
   Interest Expense         0.01%      0.01%      0.02%      0.05%       0.07%
   Net investment
    income                  3.04%      3.12%      3.04%      3.47%       2.27%
</TABLE>
+    The  operating  expenses  of  the  Fund  may  reflect  a  reduction  of the
     Investment  Adviser  fee,  an  allocation  of  expenses  to the  Investment
     Adviser,  or both.  Had such  actions  not been  taken,  the ratios and net
     investment income per share would have been as follows:
<TABLE>
<CAPTION>
<S>                              <C>           <C>           <C>           <C>           <C>
  Ratios (as a percentage of
  average daily net assets):
   Expenses(3)                          0.76%         0.67%         0.69%         0.73%          0.87%
   Expenses after custodian fee
    reduction(3)                        0.68%         0.61%         0.63%           --             --
   Net investment income                2.76%         2.96%         2.66%         3.02%          1.88%
  Net investment income per
   share                         $    0.0277   $    0.0296   $    0.0266   $    0.0303    $    0.0189
  Leverage Analysis
  Amount of debt outstanding at
  end of year                    $        --   $        --           $--   $ 1,266,000    $ 6,117,000
  Average daily balance of debt
  oustanding during year         $   109,382       134,611       116,757       279,586        440,145
  Average weekly balance of
  shares outstanding during
  year                            54,796,165    64,279,572    61,730,866    51,107,215     40,463,382
  Average amount of debt per
  share during year              $     0.002   $     0.002   $     0.002   $     0.005    $     0.011
</TABLE>
 
*    For the period from the start of  business,  April 5, 1995 to December  31,
     1995.
+    Annualized.
(1)  Total  return is  calculated  assuming a purchase of the net asset value on
     the  first  day and a sale at the net  asset  value on the last day of each
     period reported. Distributions, if any, are assumed to be reinvested at the
     net asset value on the  reinvestment  date.  Total  return is computed on a
     non-annualized basis.
(2)  Includes  the Money Market  Fund's,  Cash Fund's and Liquid  Assets  Fund's
     share of the Portfolio's allocated expenses.
(3)  The expense ratios for the year ended December 31, 1996 and thereafter have
     been  adjusted  to  reflect a change  in  reporting  requirements.  The new
     reporting  guidelines  require Tax Free  Reserves  to increase  its expense
     ratio by the effect of any  expense  offset  arrangements  with its service
     providers.  The  expense  ratios for each of the prior  years have not been
     adjusted to reflect this change.
 
 
                                       13
<PAGE>
{LOGO}              Investing
EATON VANCE           for the
Mutual Funds             21st
                      Century(R)




MORE INFORMATION
- --------------------------------------------------------------------------------
 
     About  the  Funds:  More  information  is  available  in the  statement  of
     additional   information.   The  statement  of  additional  information  is
     incorporated  by reference  into this  prospectus.  Additional  information
     about each Fund's  investments  is available in the annual and  semi-annual
     reports to shareholders.  In the annual report,  you will find a discussion
     of the market  conditions  and  investment  strategies  that  significantly
     affected each Fund's  performance during the past year. You may obtain free
     copies of the  statement  of  additional  information  and the  shareholder
     reports by contacting:

                         EATON VANCE DISTRIBUTORS, INC.
                                255 State Street
                                Boston, MA 02109
                                 1-800-225-6265
                           website: www.eatonvance.com

     You will find and may copy  information  about each Fund at the  Securities
     and Exchange  Commission's  public  reference room in Washington,  DC (call
     1-800-SEC-0330    for   information);    on   the   SEC's   Internet   site
     (http://www.sec.gov);  or upon  payment of  copying  fees by writing to the
     SEC's public reference room in Washington, DC 20549-6009.
 
     About  Shareholder  Accounts:  You can obtain more  information  from Eaton
     Vance Share- holder Services (1-800-225-6265).  If you own shares and would
     like to add to,  redeem or change your  account,  please  write or call the
     transfer agent:
- --------------------------------------------------------------------------------

                       FIRST DATA INVESTOR SERVICES GROUP
                                  P.O. BOX 5123
                           WESTBOROUGH, MA 01581-5123
                                 1-800-262-1122
 
 
SEC File No.  811-4015                                                      MMFP



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