JANUS INVESTMENT FUND
497, 1996-09-25
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CONTENTS

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FEE TABLE
 ............................................................................  2
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FINANCIAL HIGHLIGHTS
 ............................................................................  3
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INVESTMENT OBJECTIVES,
POLICIES AND TECHNIQUES
 ............................................................................  3
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INVESTMENT ADVISER AND ADMINISTRATOR
 ............................................................................  6
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DISTRIBUTIONS AND TAXES
 ............................................................................  7
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PERFORMANCE
 ............................................................................  8
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MISCELLANEOUS INFORMATION
 ............................................................................  9
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SHAREHOLDER'S GUIDE
Purchases ................................................................... 10
Redemptions ................................................................. 10
Shareholder Communications .................................................. 10

                             SUBJECT TO COMPLETION
                PRELIMINARY PROSPECTUS DATED SEPTEMBER 24, 1996


                                     [LOGO]


                             JANUS MONEY MARKET FUND
                       JANUS GOVERNMENT MONEY MARKET FUND
                       JANUS TAX-EXEMPT MONEY MARKET FUND

                                 Service Shares

                               100 Fillmore Street
                              Denver, CO 80206-4923

                                ____________, 1996



Janus  Money  Market  Fund,  Janus  Government  Money  Market  Fund,  and  Janus
Tax-Exempt  Money Market Fund  (individually,  a "Fund" and,  collectively,  the
"Funds") are designed for investors who seek maximum  current income  consistent
with stability of capital.  This prospectus offers a separate class of shares of
each Fund  (collectively,  the  "Shares")  exclusively  through  banks and other
financial  institutions  ("Financial  Institutions")  in  connection  with trust
accounts,  cash  management  programs  and  similar  programs  provided to their
customers.  Each  Fund is a  separate  series  of  Janus  Investment  Fund  (the
"Trust"), an open-end management investment company.

Each Fund invests  exclusively  in high quality  money  market  instruments.  AN
INVESTMENT IN A FUND IS NEITHER  INSURED NOR GUARANTEED BY THE U.S.  GOVERNMENT.
THERE IS NO  ASSURANCE  THAT A FUND WILL BE ABLE TO  MAINTAIN A STABLE NET ASSET
VALUE OF $1.00 PER SHARE.

The Shares are offered with no sales charges, commissions, redemption fees, Rule
12b-1 fees or deferred sales  charges.  There is a $250,000  initial  investment
minimum by each Financial  Institution.  The Financial Institution may aggregate
investments by all of its customers to achieve this minimum. There is no minimum
amount  required for  subsequent  investments.  For  complete  details on how to
purchase,  redeem  and  exchange  Shares,  please  see the  Shareholder's  Guide
beginning at page 10.

This prospectus contains information about the Shares that prospective investors
should consider  before  investing and should be read carefully and retained for
future  reference.  Additional  information about the Shares is contained in the
Statement of Additional  Information  ("SAI") dated November 22, 1996,  which is
filed with the Securities and Exchange Commission ("SEC") and is incorporated by
reference  into this  Prospectus.  The SAI is available upon request and without
charge by writing or calling your Financial Institution.

THE SHARES  OFFERED BY THIS  PROSPECTUS  ARE NOT DEPOSITS OR  OBLIGATIONS OF ANY
BANK,  ARE NOT ENDORSED OR  GUARANTEED  BY ANY BANK,  AND ARE NOT INSURED BY THE
FEDERAL DEPOSIT INSURANCE  CORPORATION,  THE FEDERAL RESERVE BOARD, OR ANY OTHER
GOVERNMENT AGENCY.

THESE  SECURITIES  HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SEC OR ANY STATE
SECURITIES  COMMISSION NOR HAS THE SEC OR ANY STATE SECURITIES COMMISSION PASSED
UPON THE  ACCURACY OR ADEQUACY OF THIS  PROSPECTUS.  ANY  REPRESENTATION  TO THE
CONTRARY IS A CRIMINAL OFFENSE.

THIS  PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL SECURITIES IN ANY STATE OR
OTHER JURISDICTION TO ANY PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH AN OFFER IN
SUCH STATE OR OTHER JURISDICTION.

INFORMATION   CONTAINED  HEREIN  IS  SUBJECT  TO  COMPLETION  OR  AMENDMENT.   A
REGISTRATION  STATEMENT  RELATING  TO THESE  SECURITIES  HAS BEEN FILED WITH THE
SECURITIES  AND EXCHANGE  COMMISSION.  THESE  SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION  STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE  AN  OFFER  TO  SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN ANY STATE IN WHICH SUCH OFFER,  SOLICITATION  OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.

JANUS MONEY MARKET FUNDS - SERVICE SHARES PROSPECTUS                           1
<PAGE>
FEE TABLE

SHAREHOLDER TRANSACTION EXPENSES (Applicable to each Fund)

     Sales Load Imposed on Purchases                                     None
     Sales Load Imposed on Reinvested Dividends                          None
     Deferred Sales Load                                                 None
     Redemption Fees                                                     None
     Exchange Fee                                                        None



ANNUAL OPERATING EXPENSES*
(Expressed as a percentage of average net assets)

<TABLE>
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                           Management          Other        Total Operating
                                                                               Fee           Expenses          Expenses
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                           <C>              <C>               <C>
Janus Money Market Fund - Service Shares                                      0.10%            0.30%             0.40%
Janus Government Money Market Fund - Service Shares                           0.10%            0.30%             0.40%
Janus Tax-Exempt Money Market Fund - Service Shares                           0.10%            0.30%             0.40%
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

*The fees and  expenses in the table above are based on the  estimated  fees and
expenses  that the Service  Shares of the Funds expect to incur in their initial
fiscal  year,  net of fee waivers  from the  investment  adviser.  Without  such
waivers,  the Management  Fee, Other Expenses and Total  Operating  Expenses for
Service Shares are estimated to be 0.20%, 0.40% and 0.60%,  respectively.  Janus
Capital may modify or terminate  the waivers at any time upon 90 days' notice to
the Trustees.  See "Investment  Adviser and  Administrator"  for a more detailed
discussion of the fees.

EXAMPLE
You would indirectly pay the following expenses on a $1,000 investment, assuming
expense ratios remain as listed above and assuming a 5% annual  return,  with or
without redemption at the end of each period:

<TABLE>
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                  1 Year                     3 Years
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                 <C>                        <C>
Janus Money Market Fund - Service Shares                                            $4                         $13
Janus Government Money Market Fund - Service Shares                                 $4                         $13
Janus Tax-Exempt Money Market Fund - Service Shares                                 $4                         $13
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
THE EXPENSES IN THE EXAMPLE ABOVE SHOULD NOT BE CONSIDERED A  REPRESENTATION  OF
PAST OR FUTURE  EXPENSES  AND ACTUAL  EXPENSES MAY BE GREATER OR LESS THAN THOSE
SHOWN. THE ASSUMED 5% ANNUAL RETURN IS HYPOTHETICAL AND SHOULD NOT BE CONSIDERED
A REPRESENTATION OF PAST OR FUTURE ANNUAL RETURNS,  WHICH MAY BE GREATER OR LESS
THAN THE ASSUMED AMOUNT.

The  purpose of the  preceding  table and  example is to assist the  investor in
understanding  the various costs and expenses that an investor in each Fund will
bear directly or  indirectly.  These  expenses are  described in greater  detail
under "Investment Adviser and Administrator."

JANUS MONEY MARKET FUNDS - SERVICE SHARES PROSPECTUS                           2
<PAGE>
FINANCIAL HIGHLIGHTS

No Financial  Highlights are presented for the Shares because the Shares did not
commence operations until November 22, 1996.

INVESTMENT OBJECTIVES, POLICIES AND TECHNIQUES

Unless  otherwise  stated,  the investment  objectives and policies set forth in
this  Prospectus are not  fundamental  and may be changed by the Trustees of the
Trust  (the  "Trustees")  without  shareholder  approval.  Shareholders  will be
notified of material changes in investment objectives or policies. If there is a
change in the investment objective or policies of any Fund,  shareholders should
consider  whether that Fund remains an appropriate  investment in light of their
then current  financial  position and needs. The Funds are subject to additional
investment  policies and  restrictions  described in the SAI,  some of which are
fundamental and may not be changed without shareholder approval.

INVESTMENT OBJECTIVES

The investment  objective of Janus Money Market Fund and Janus  Government Money
Market Fund is to seek  maximum  current  income to the extent  consistent  with
stability of capital.  The investment objective of Janus Tax-Exempt Money Market
Fund is to seek maximum  current income that is exempt from federal income taxes
to the extent  consistent  with stability of capital.  There can be no assurance
that a Fund will  achieve its  investment  objective  or that the Shares will be
able to maintain a stable net asset value of $1.00 per share.

COMMON INVESTMENT POLICIES

The Funds will invest only in eligible  high  quality,  short-term  money market
instruments  that present  minimal credit risks,  as determined by Janus Capital
Corporation,  the Funds'  investment  adviser  ("Janus  Capital"),  pursuant  to
procedures  adopted  by  the  Trustees.  Each  Fund  may  invest  only  in  U.S.
dollar-denominated  instruments  that have a  remaining  maturity of 397 days or
less (as calculated  pursuant to Rule 2a-7 under the  Investment  Company Act of
1940  ("1940  Act"))  and will  maintain  a  dollar-weighted  average  portfolio
maturity of 90 days or less.

Except  to the  limited  extent  permitted  by Rule  2a-7  and  except  for U.S.
Government Securities (as defined below), each Fund will not invest more than 5%
of its total  assets in the  securities  of any one issuer.  A guarantor  is not
considered  an issuer for the purpose of this limit,  provided that the value of
all securities held by a Fund that are issued or guaranteed by that  institution
does not exceed 10% of the Fund's total  assets.  Until the  amendments  to Rule
2a-7 become effective,  up to 25% of Janus Tax-Exempt Money Market Fund's assets
may be invested without regard to the foregoing limitations.  To ensure adequate
liquidity,  no Fund may  invest  more  than 10% of its net  assets  in  illiquid
investments,  including  repurchase  agreements maturing in more than seven days
(unless  subject to a demand feature) and certain time deposits that are subject
to early  withdrawal  penalties and mature in more than seven days.  Because the
Funds are typically used as a cash management vehicle, they intend to maintain a
high degree of liquidity. Janus Capital determines and monitors the liquidity of
portfolio securities under the supervision of the Trustees.

Ratings.
High quality money market  instruments  include those that (i) are rated (or, if
unrated,  are issued by an issuer with  comparable  outstanding  short-term debt
that is rated) in one of the two highest rating  categories for short-term  debt
by any two nationally recognized statistical rating organizations ("NRSROs") or,
if only one  NRSRO  has  issued a rating,  by that  NRSRO or (ii) are  otherwise
unrated and determined by Janus Capital to be of comparable quality.  Each Fund,
except Janus Tax-Exempt Money Market Fund, will invest at least 95% of its total
assets in securities in the highest rating  category (as determined  pursuant to
Rule 2a-7).  Descriptions of the rating  categories of Standard & Poor's Ratings
Services,  Moody's  Investors  Service,  Inc.,  and  certain  other  NRSROs  are
contained  in the SAI,  as is a further  description  of the  Funds'  investment
policies.

Although  each Fund only invests in high quality  money market  instruments,  an
investment in a Fund is subject to risk even if all  securities in its portfolio
are paid in full at  maturity.  All money  market  instruments,  including  U.S.
Government  Securities,  can change in value as a result of changes in  interest
rates, the issuer's actual or perceived creditworthiness or the issuer's ability
to meet its obligations.

TYPES OF INVESTMENTS

Janus Money Market Fund

Janus Money  Market Fund pursues its  objective  by investing  primarily in high
quality commercial paper and obligations of financial institutions. The Fund may
also  invest in U.S.  Government  Securities  (as defined  below) and  municipal
securities,  although the Fund expects to invest in such  securities to a lesser
degree.

Debt Obligations.
The  Fund  may  invest  in  debt  obligations  of  domestic  issuers,  including
commercial  paper  (short-term  promissory  notes issued by companies to finance
their, or their affiliates', current obligations), notes and bonds, and variable
amount master demand notes. The payment  obligations on these instruments may be
backed by  securities,  swap  agreements or other assets,  by the guarantee of a
third party or solely by the  unsecured  promise of the issuer to make  payments
when due.  The Fund may invest in  privately  issued  commercial  paper or other
securities  that are restricted as to disposition  under the federal  securities
laws. In general,  sales of these securities may not be made absent registration
under the  Securities  Act of 1933 (the "1933  Act") or the  availability  of an
appropriate  exemption  therefrom.  Pursuant to Section  4(2) of the 1933 Act or
Rule 144A adopted  under the 1933 Act,  however,  some of these  securities  are
eligible for resale to institutional investors,  and accordingly,  Janus Capital
may  determine  that a liquid  market  exists  for such a security  pursuant  to
guidelines adopted by the Trustees.

JANUS MONEY MARKET FUNDS - SERVICE SHARES PROSPECTUS                           3
<PAGE>
Obligations of Financial Institutions.
The Fund may  invest in  obligations  of  financial  institutions.  Examples  of
obligations  in which the Fund may invest  include  negotiable  certificates  of
deposit, bankers' acceptances and time deposits of U.S. banks (including savings
and loan associations)  having total assets in excess of one billion dollars and
U.S.  branches of foreign  banks  having  total  assets in excess of ten billion
dollars.  The Fund may also invest in Eurodollar and Yankee bank  obligations as
discussed below.

Certificates  of deposit  represent an  institution's  obligation to repay funds
deposited  with it that earn a  specified  interest  rate  over a given  period.
Bankers'  acceptances are negotiable  obligations of a bank to pay a draft which
has been drawn by a customer  and are usually  backed by goods in  international
trade. Time deposits are non-negotiable deposits with a banking institution that
earn a specified interest rate over a given period.  Fixed time deposits,  which
are  payable  at a  stated  maturity  date and  bear a fixed  rate of  interest,
generally  may be  withdrawn  on demand by the Fund but may be  subject to early
withdrawal  penalties  that could  reduce the Fund's  yield.  Unless  there is a
readily  available  market for them,  time  deposits  that are  subject to early
withdrawal  penalties and that mature in more than seven days will be treated as
illiquid securities.

Eurodollar or Yankee Obligations.
The Fund may invest in Eurodollar and Yankee bank  obligations.  Eurodollar bank
obligations  are  dollar-denominated  certificates  of deposit or time  deposits
issued outside the U.S. capital markets by foreign branches of U.S. banks and by
foreign banks. Yankee bank obligations are dollar-denominated obligations issued
in the U.S. capital markets by foreign banks.

Eurodollar  (and to a limited  extent,  Yankee) bank  obligations are subject to
certain  sovereign  risks.  One  such  risk is the  possibility  that a  foreign
government  might  prevent  dollar-denominated  funds  from  flowing  across its
borders.  Other risks include:  adverse political and economic developments in a
foreign  country;  the extent and quality of government  regulation of financial
markets and  institutions;  the  imposition of foreign  withholding  taxes;  and
expropriation or nationalization of foreign issuers.

U.S. Government Securities.
The Fund may invest  without  limit in U.S.  Government  Securities as described
below under "Janus Government Money Market Fund."

Municipal Securities.
The Fund may invest in obligations of states,  territories or possessions of the
United States and their subdivisions,  authorities and corporations as described
below under "Janus  Tax-Exempt  Money Market  Fund." These  obligations  may pay
interest that is exempt from federal income taxation.

JANUS GOVERNMENT MONEY MARKET FUND

Janus   Government   Money  Market  Fund  pursues  its  objective  by  investing
exclusively in obligations issued and/or guaranteed as to principal and interest
by the United  States  government or by its agencies and  instrumentalities  and
repurchase agreements secured by such obligations.

U.S. Government Securities.
U.S. Government Securities shall have the meaning set forth in the 1940 Act. The
1940 Act defines U.S.  Government  Securities  to include  securities  issued or
guaranteed  by the U.S.  government,  its agencies and  instrumentalities.  U.S.
Government Securities may also include repurchase  agreements  collateralized by
and  municipal  securities  escrowed  with  or  refunded  with  U.S.  government
securities. U.S. Government Securities in which the Fund may invest include U.S.
Treasury  securities  and  obligations  issued or guaranteed by U.S.  government
agencies and  instrumentalities  that are backed by the full faith and credit of
the  U.S.   government,   such  as  those   guaranteed  by  the  Small  Business
Administration  or issued by the Government  National Mortgage  Association.  In
addition,  U.S.  Government  Securities  in which  the Fund may  invest  include
securities  supported primarily or solely by the creditworthiness of the issuer,
such as securities of the Federal  National  Mortgage  Association,  the Federal
Home Loan Mortgage  Corporation and the Tennessee Valley Authority.  There is no
guarantee  that the U.S.  government  will support  securities not backed by its
full faith and credit. Accordingly,  although these securities have historically
involved little risk of loss of principal if held to maturity,  they may involve
more  risk than  securities  backed  by the full  faith  and  credit of the U.S.
government.

Janus Tax-Exempt Money Market Fund

Janus Tax-Exempt Money Market Fund pursues its objective by investing  primarily
in municipal  securities  whose  interest is exempt from federal  income  taxes,
including the federal alternative minimum tax. Although the Fund will attempt to
invest substantially all of its assets in municipal securities whose interest is
exempt from federal  income  taxes,  the Fund reserves the right to invest up to
20% of the value of its net assets in  securities  whose  interest is  federally
taxable. Additionally, when its portfolio manager is unable to locate investment
opportunities with desirable  risk/reward  characteristics,  the Fund may invest
without limit in cash and cash  equivalents,  including  obligations that may be
federally taxable (see "Taxable Investments").

Municipal Securities.
The municipal  securities in which the Fund may invest include  municipal  notes
and short-term  municipal  bonds.  Municipal notes are generally used to provide
for the issuer's  short-term  capital needs and generally have maturities of 397
days or less. Examples include tax anticipation and revenue  anticipation notes,
which generally are issued in anticipation of various  seasonal  revenues,  bond
anticipation  notes,  construction  loan notes and tax-exempt  commercial paper.
Short-term  municipal bonds may include  "general  obligation  bonds," which are
secured by the issuer's pledge of its faith, credit and taxing power for payment
of principal and interest;  "revenue  bonds," which are generally  paid from the
revenues of a particular  facility or a specific excise tax or other source; and
"industrial  development  bonds,"  which  are  issued  by or on behalf of public
authorities

JANUS MONEY MARKET FUNDS - SERVICE SHARES PROSPECTUS                           4
<PAGE>
to provide  funding for various  privately  operated  industrial  and commercial
facilities.  The Fund may also invest in high quality participation interests in
municipal securities.  A more detailed description of various types of municipal
securities is contained in Appendix B in the SAI.

When the assets and revenues of an agency,  authority,  instrumentality or other
political  subdivision  are separate from those of the  government  creating the
issuing  entity and a security is backed only by the assets and  revenues of the
issuing  entity,  that  entity  will be  deemed  to be the  sole  issuer  of the
security.  Similarly,  in the case of an industrial development bond backed only
by the assets and revenues of the non-governmental  issuer, the non-governmental
issuer will be deemed to be the sole issuer of the bond.

At times,  the Fund may invest more than 25% of the value of its total assets in
tax-exempt securities that are related in such a way that an economic, business,
or political  development or change  affecting one such security could similarly
affect the other securities;  for example,  securities whose issuers are located
in the same state,  or  securities  whose  interest is derived from  revenues of
similar type  projects.  The Fund may also invest more than 25% of its assets in
industrial development bonds or participation interests therein.

Yields on municipal securities are dependent on a variety of factors,  including
the  general  conditions  of the  money  market  and of the  municipal  bond and
municipal note markets, the size of a particular  offering,  the maturity of the
obligation and the rating of the issue. The achievement of the Fund's investment
objective  is  dependent  in part on the  continuing  ability of the  issuers of
municipal securities in which the Fund invests to meet their obligations for the
payment of principal and interest when due.  Obligations of issuers of municipal
securities  are subject to the  provisions of  bankruptcy,  insolvency and other
laws  affecting  the rights and remedies of  creditors,  such as the  Bankruptcy
Reform Act of 1978, as amended.  Therefore,  the  possibility  exists that, as a
result of litigation or other conditions, the ability of any issuer to pay, when
due, the principal of and interest on its municipal securities may be materially
affected.

Municipal Leases.
The Fund may invest in  municipal  leases or  participation  interests  therein.
Municipal leases are municipal  securities which may take the form of a lease or
an installment  purchase or conditional  sales  contract.  Municipal  leases are
issued by state and local  governments and authorities to acquire a wide variety
of equipment and facilities.  Lease obligations may not be backed by the issuing
municipality's credit and may involve risks not normally associated with general
obligation bonds and other revenue bonds. For example, their interest may become
taxable if the lease is assigned  and the holders may incur losses if the issuer
does not appropriate  funds for the lease payment on an annual basis,  which may
result in  termination  of the lease and  possible  default.  Janus  Capital may
determine that a liquid market exists for municipal lease  obligations  pursuant
to guidelines established by the Trustees.

Taxable Investments.
As discussed above,  although the Fund will attempt to invest  substantially all
of its assets in  municipal  securities  whose  interest is exempt from  federal
income  tax,  the  Fund  may  under  certain  circumstances  invest  in  certain
securities whose interest is subject to such taxation. These securities include:
(i)   short-term   obligations   of  the  U.S.   government,   its  agencies  or
instrumentalities,  (ii)  certificates  of  deposit,  bankers'  acceptances  and
interest-bearing  savings deposits of banks having total assets of more than one
billion dollars and whose deposits are insured by the Federal Deposit  Insurance
Corporation,  (iii) commercial paper and (iv) repurchase agreements as described
below covering any of the securities  described in items  (i)-(iii) above or any
other obligations of the U.S. government, its agencies or instrumentalities.

COMMON INVESTMENT TECHNIQUES

Participation Interests.
The Funds may invest in participation interests in any type of security in which
the  Funds  may  invest.  A  participation  interest  gives a Fund an  undivided
interest  in  the  underlying  securities  in the  proportion  that  the  Fund's
participation  interest  bears to the total  principal  amount of the underlying
securities. Participation interests usually carry a demand feature, as described
below,  backed by a letter of credit or guarantee of the institution that issued
the interests permitting the holder to tender them back to the institution.

Demand Features.
The Funds  may  invest  in  securities  that are  subject  to puts and  stand-by
commitments  ("demand  features").  Demand  features  give the Fund the right to
resell  securities  at specified  periods prior to their  maturity  dates to the
seller or to some third party at an agreed-upon price or yield.  Securities with
demand features may involve certain expenses and risks,  including the inability
of the  issuer  of the  instrument  to pay for the  securities  at the  time the
instrument is exercised,  non-marketability  of the instrument  and  differences
between  the  maturity  of the  underlying  security  and  the  maturity  of the
instrument.  Securities  may cost more with demand  features  than without them.
Demand features can serve three purposes:  to shorten the maturity of a variable
or floating rate  security,  to enhance the  instrument's  credit quality and to
provide a source of liquidity.  Demand  features are often issued by third party
financial institutions,  generally domestic and foreign banks. Accordingly,  the
credit quality and liquidity of the Funds'  investments may be dependent in part
on the credit quality of the banks supporting the Funds' investments.  This will
result in exposure to risks  pertaining to the banking  industry,  including the
foreign banking industry.  Brokerage firms and insurance  companies also provide
certain  liquidity  and  credit  support.  A  substantial  portion  of the Janus
Tax-Exempt Money Market Fund's portfolio in particular may consist of securities
backed by banks and other  financial  institutions,  and thus adverse changes in
the credit  quality of these  institutions  could  cause  losses to the Fund and
affect its share price.

Variable and Floating Rate Securities.
The  securities in which the Funds invest may have variable or floating rates of
interest.  These securities pay interest

JANUS MONEY MARKET FUNDS - SERVICE SHARES PROSPECTUS                           5
<PAGE>
at rates  that are  adjusted  periodically  according  to a  specified  formula,
usually with  reference to some  interest  rate index or market  interest  rate.
Securities  with  ultimate  maturities of greater than 397 days may be purchased
only pursuant to Rule 2a-7.  Under that Rule, only those  long-term  instruments
that have demand  features  which comply with certain  requirements  and certain
variable rate U.S. Government Securities may be purchased. Similar to fixed rate
debt instruments,  variable and floating rate instruments are subject to changes
in value based on changes in market interest rates or changes in the issuer's or
guarantor's creditworthiness.  The rate of interest on securities purchased by a
Fund may be tied to  short-term  Treasury  or  other  government  securities  or
indices on securities that are permissible  investments of the Funds, as well as
other money  market rates of  interest.  The Funds will not purchase  securities
whose values are tied to interest rates or indices that are not  appropriate for
the duration and volatility standards of a money market fund.

Mortgage- and
Asset-Backed Securities.
Janus Money  Market Fund and Janus  Government  Money  Market Fund may  purchase
fixed or adjustable  rate  mortgage-backed  securities  issued by the Government
National  Mortgage  Association,  Federal  National  Mortgage  Association,  the
Federal   Home   Loan   Mortgage   Corporation,   or   other   governmental   or
government-related  entities. In addition,  Janus Money Market Fund may purchase
other asset-backed securities,  including securities backed by automobile loans,
equipment  leases or credit  card  receivables.  These  securities  directly  or
indirectly  represent a  participation  in, or are secured by and payable  from,
fixed or  adjustable  rate  mortgage or other loans which may be secured by real
estate or other assets.  Unlike traditional debt instruments,  payments on these
securities include both interest and a partial payment of principal. Prepayments
of the  principal of underlying  loans may shorten the  effective  maturities of
these securities and may result in a Fund having to reinvest proceeds at a lower
interest rate.

Repurchase Agreements.
Each Fund may seek additional income by entering into collateralized  repurchase
agreements.  Repurchase  agreements are  transactions  in which a Fund purchases
securities and  simultaneously  commits to resell those securities to the seller
at an agreed-upon price on an agreed-upon future date. The resale price reflects
a market rate of interest  that is not related to the coupon rate or maturity of
the  purchased  securities.  If  the  seller  of  the  securities  underlying  a
repurchase agreement fails to pay the agreed resale price on the agreed delivery
date, a Fund may incur costs in disposing of the  collateral  and may experience
losses if there is any delay in its ability to do so.

Reverse Repurchase Agreements.
Each Fund may enter  into  reverse  repurchase  agreements.  Reverse  repurchase
agreements are transactions in which a Fund sells a security and  simultaneously
commits to repurchase that security from the buyer at an agreed upon price on an
agreed upon future  date.  This  technique  will be used only for  temporary  or
emergency purposes,  such as meeting redemption requests,  or to earn additional
income on portfolio securities.

Delayed Delivery Securities.
Each Fund may purchase  securities on a when-issued or delayed  delivery  basis.
Securities so purchased are subject to market price fluctuation from the time of
purchase but no interest on the securities  accrues to a Fund until delivery and
payment for the securities take place. Accordingly,  the value of the securities
on the  delivery  date may be more or less  than  the  purchase  price.  Forward
commitments  will be entered  into only when a Fund has the  intention of taking
possession  of the  securities,  but a Fund may sell the  securities  before the
settlement date if deemed advisable.

Borrowing and Lending.
Each Fund may borrow money for temporary or emergency  purposes in amounts up to
25% of its total assets. A Fund may not mortgage or pledge  securities except to
secure  permitted  borrowings.  As a  fundamental  policy,  a Fund will not lend
securities  or other  assets if, as a result,  more than 25% of its total assets
would be lent to other parties;  however,  the Funds do not currently  intend to
engage in securities lending.  Each Fund intends to seek permission from the SEC
to borrow money from or lend money to other funds that permit such  transactions
and are advised by Janus  Capital.  There is no assurance  that such  permission
will be granted.

INVESTMENT ADVISER AND ADMINISTRATOR

INVESTMENT ADVISER

Each Fund has a separate Investment  Advisory Agreement with Janus Capital,  100
Fillmore  Street,  Denver,  Colorado  80206-4923.  Janus  Capital  has served as
investment  adviser to Janus Fund since 1970 and currently  serves as investment
adviser to all of the Janus  funds,  as well as adviser or  subadviser  to other
mutual funds and  individual,  corporate,  charitable and  retirement  accounts.
Kansas City Southern  Industries,  Inc., a publicly traded holding company whose
primary subsidiaries are engaged in transportation,  information  processing and
financial  services  ("KCSI"),  owns approximately 83% of the outstanding voting
stock of Janus  Capital.  Thomas H. Bailey,  the  President  and Chairman of the
Board of Janus  Capital,  owns  approximately  12% of its voting  stock and,  by
agreement with KCSI, selects a majority of Janus Capital's Board.

JANUS MONEY MARKET FUNDS - SERVICE SHARES PROSPECTUS                           6
<PAGE>
Pursuant  to  the  Investment  Advisory  Agreements,   Janus  Capital  furnishes
continuous advice and recommendations  concerning each Fund's investments.  Each
of the Funds has agreed to compensate Janus Capital for its advisory services by
the  monthly  payment of a fee at the  annual  rate of 0.20% of the value of the
average  daily net  assets of each  Fund.  Janus  Capital  has agreed to waive a
portion  of its fee and  accordingly,  the  advisory  fee of each  Fund  will be
calculated at the annual rate of 0.10% of the value of each Fund's average daily
net assets. Janus Capital may modify or terminate the waiver at any time upon 90
days' notice to the Trustees.

ADMINISTRATOR

Each of the Funds has also entered into an  Administration  Agreement with Janus
Capital,  pursuant  to which Janus  Capital  furnishes  certain  administrative,
compliance  and  accounting  services for the Funds,  pays the costs of printing
reports and  prospectuses for existing  shareholders,  provides office space for
the Funds and pays the  salaries,  fees and expenses of all Fund officers and of
those Trustees who are affiliated  with Janus Capital.  Administrative  services
provided by Janus Capital under the  Administration  Agreements  include custody
and transfer  agency  services.  Janus  Capital is paid an  administration  fee,
calculated  daily and paid monthly,  at the annual rate of 0.40% of the value of
the average  daily net assets of each Fund  attributable  to Shares for services
rendered pursuant to the Administration Agreements.  Janus Capital has agreed to
waive a portion of its fee and accordingly,  the  administration fee paid by the
Shares  will be  calculated  at the  annual  rate of 0.30% of the  value of each
Fund's average daily net assets  attributable  to the Shares.  Janus Capital may
modify  or  terminate  this  waiver  at any  time  upon 90 days'  notice  to the
Trustees.

Each Fund pays all of its  expenses  not  assumed  by Janus  Capital,  including
auditing fees and independent Trustees' fees and expenses.

Janus Capital may use all or a portion of its  administration  fee to compensate
Financial Institutions for providing  administrative services to their customers
who invest in the Shares. The types of services that the Financial  Institutions
would provide  include  serving as the sole  shareholder of record,  shareholder
recordkeeping,  processing and aggregating purchase and redemption transactions,
providing  periodic  statements,   forwarding   shareholder  reports  and  other
materials,  providing tax information, and providing other similar services that
the  Funds  would  have to  perform  if they  were  dealing  directly  with  the
beneficial owners,  rather than the Financial  Institutions,  as shareholders of
record.

The Glass-Steagall Act prohibits a depository  institution (such as a commercial
bank or a savings and loan association) from being an underwriter or distributor
of most securities.  In the event the  Glass-Steagall  Act is deemed to prohibit
depository  institutions from acting in the administrative  capacities described
above or should Congress relax current restrictions on depository  institutions,
the Trustees will consider appropriate changes in the services.

PORTFOLIO TRANSACTIONS

Purchases and sales of securities on behalf of each Fund are executed by brokers
and dealers selected by Janus Capital.  Broker-dealers are selected on the basis
of their ability to obtain best price and execution for the Funds'  transactions
and recognizing brokerage,  research and other services provided to the Fund and
to Janus  Capital.  Janus  Capital may also  consider  payments  made by brokers
effecting  transactions  for a Fund i) to the  Fund or ii) to other  persons  on
behalf  of the  Fund for  services  provided  to the Fund for  which it would be
obligated to pay. The Funds'  Trustees have also  authorized  the Funds to place
portfolio  transactions  on  an  agency  basis  with  a  broker-dealer  that  is
affiliated with Janus Capital.  Agency trades, if any, that are placed with such
affiliated  party serve to reduce certain expenses of the Funds. The SAI further
explains the selection of broker-dealers.

PERSONAL INVESTING

Janus Capital does not permit portfolio managers to purchase and sell securities
for their own accounts  subject to Janus  Capital's  policy  governing  personal
investing.  Janus Capital's  policy  requires  investment and other personnel to
conduct  their  personal  investment  activities  in a manner that Janus Capital
believes is not  detrimental  to the Funds and Janus  Capital's  other  advisory
clients. See the SAI for more detailed information.

DISTRIBUTIONS AND TAXES

Dividends  representing  substantially  all of the net investment income and any
net realized gains on sales of securities are declared daily, Saturdays, Sundays
and holidays  included,  and distributed on the last business day of each month.
If a month begins on a Saturday, Sunday or holiday, dividends for those days are
declared at the end of the preceding month and distributed on the first business
day of the month.  Distributions  will be  reinvested in Shares of a Fund unless
otherwise  elected by the  shareholder  pursuant to the  options  offered by the
Financial Institution.

Distributions  for all of the Funds (except Janus  Tax-Exempt Money Market Fund)
are  taxable   income  and  are  subject  to  federal  income  tax  (except  for
shareholders exempt from income tax), whether such distributions are received in
cash or are reinvested in additional Shares. Full

JANUS MONEY MARKET FUNDS - SERVICE SHARES PROSPECTUS                           7
<PAGE>
information  regarding the tax status of income  dividends and any capital gains
distributions  will be mailed to  Financial  Institutions  who will  forward the
information  to their  customers  for tax purposes on or before  January 31st of
each year.  Because the Funds are money  market  funds,  they do not  anticipate
making any capital gains distributions.

Janus Tax-Exempt Money Market Fund  anticipates  that  substantially  all income
dividends it pays will be exempt from  federal  income tax.  However,  dividends
attributable  to interest on taxable  investments,  together with  distributions
from any net  realized  capital  gains,  are taxable.  In addition,  interest on
certain  private  activity  bonds  is a  preference  item  for  purposes  of the
individual and corporate  alternative minimum taxes. To the extent that the Fund
earns such income,  shareholders who are subject to the alternative  minimum tax
must include such income as a preference item. The Fund will advise shareholders
of the percentage of dividends, if any, subject to the alternative minimum tax.

Dividends and capital gains distributions may also be subject to state and local
taxes. In certain states some portion of dividends and distributions  (depending
on the sources of the Fund's net income) of Janus  Tax-Exempt  Money Market Fund
may be exempt from state and local taxes.  Shareholders should consult their own
tax advisor regarding exemption from any applicable state and local tax, as well
as the tax treatment of any dividends or distributions from the Shares.

The  Funds  intend  to comply  with  provisions  of the  Internal  Revenue  Code
applicable to investment companies,  and thus it is not expected that any of the
Funds  will be  required  to pay any  federal  income or excise  taxes.  The SAI
further explains the Funds' tax status.

PERFORMANCE

The  Shares  may  measure  performance  in  several  ways,   including  "yield,"
"effective yield," and "tax equivalent yield" (for Janus Tax-Exempt Money Market
Fund  only).  Yield is a way of showing  the rate of income  the Shares  earn on
investments  as a percentage of the Share price.  Yield  represents  the income,
less expenses generated by an investment,  in the Shares over a seven-day period
expressed as an annual percentage rate. Effective yield is similar in that it is
calculated  over the same time frame,  but instead the net investment  income is
compounded and then  annualized.  Due to the compounding  effect,  the effective
yield will normally be higher than the yield.

Shares of Janus  Tax-Exempt  Money  Market  Fund may also  quote  tax-equivalent
yield, which shows the taxable yield an investor would have to earn before taxes
to equal such Shares'  tax-free yield. A  tax-equivalent  yield is calculated by
dividing  such  Shares'  tax-exempt  yield by the  result  of one minus a stated
federal tax rate.  Only that portion of the Fund's  income that is tax-exempt is
adjusted in this calculation.

Performance  figures are based upon  historical  results and are not intended to
indicate future performance.

JANUS MONEY MARKET FUNDS - SERVICE SHARES PROSPECTUS                           8
<PAGE>
MISCELLANEOUS INFORMATION

ORGANIZATION

Each Fund is an open-end management investment company registered under the 1940
Act as a series of the Trust,  which was created on February 11, 1986. Each Fund
currently  offers three classes of shares by separate  prospectuses.  The Shares
offered by this  Prospectus  are available only through  Financial  Institutions
that meet minimum  investment  requirements  in connection  with trust accounts,
cash management  programs and similar programs  provided to their  customers.  A
second class of shares, Institutional Shares of each Fund, are available only to
institutional  clients,  including  corporations,  foundations  and trusts,  and
individuals  meeting certain initial investment  requirements.  A third class of
shares,  Investor  Shares of each Fund,  are  available  to the general  public.
Because the expenses of each class may differ,  the performance of each class is
expected  to  differ.  If you would like  additional  information,  please  call
1-800-29JANUS.

TRUSTEES

The Trustees  oversee the business  affairs of the Trust and are responsible for
major decisions relating to each Fund's investment  objective and policies.  The
Trustees delegate the day-to-day  management of the Funds to the officers of the
Trust and meet at least  quarterly  to review  the Funds'  investment  policies,
performance, expenses and other business affairs.

VOTING RIGHTS

The Trust is not required to hold annual shareholder meetings.  However, special
meetings may be called for a specific  class of shares,  a specific Fund, or for
the Trust as a whole,  for  purposes  such as  electing  or  removing  Trustees,
terminating or reorganizing the Trust,  changing  fundamental policies or voting
on matters when required by the 1940 Act. Separate votes are taken by a separate
Fund (or a separate  class of shares)  only if a matter  affects or requires the
vote of just that Fund (or those shares).  Shareholders are entitled to cast one
vote for each Share they own.

CUSTODIAN, TRANSFER AGENT
AND DISTRIBUTOR

United Missouri Bank, N.A., P.O. Box 419226,  Kansas City, Missouri  64141-6226,
is the custodian of the Funds' assets. The custodian holds each Fund's assets in
safekeeping   and  collects  and  remits  the  income  thereon  subject  to  the
instructions of each Fund.

Janus Service  Corporation,  P.O. Box 173375,  Denver,  Colorado  80217-3375,  a
wholly-owned   subsidiary  of  Janus  Capital,   provides  transfer  agency  and
shareholder services for the Funds.

Janus Distributors,  Inc., 100 Fillmore Street, Denver,  Colorado 80206-4923,  a
wholly-owned subsidiary of Janus Capital, is a distributor of the Shares.

JANUS MONEY MARKET FUNDS - SERVICE SHARES PROSPECTUS                           9
<PAGE>
SHAREHOLDER'S GUIDE

INVESTORS MAY NOT PURCHASE OR REDEEM SHARES OF THE FUNDS DIRECTLY. SHARES MAY BE
PURCHASED OR REDEEMED ONLY THROUGH  FINANCIAL  INSTITUTIONS  IN CONNECTION  WITH
TRUST ACCOUNTS,  CASH MANAGEMENT  PROGRAMS AND SIMILAR PROGRAMS.  YOUR FINANCIAL
INSTITUTION  WILL  PROVIDE YOU WITH  INSTRUCTIONS  ON  PURCHASING  OR  REDEEMING
SHARES.

PURCHASES

Purchases of Fund Shares may be made only through omnibus  accounts of Financial
Institutions  in connection with trust  accounts,  cash management  programs and
similar programs.  Your Financial Institution will provide you with instructions
on purchasing Shares.

All  investments  in  the  Funds  are  credited  to  a  participating  Financial
Institution's  omnibus  account upon  acceptance  of the  investment  by a Fund.
Investments  will be  processed  at the NAV  next  determined  after an order is
received and accepted by a Fund.

Each Fund  reserves the right to reject any specific  purchase  order.  Purchase
orders may be refused if, in Janus  Capital's  opinion,  they are of a size that
would disrupt the  management of a Fund. Any Fund may  discontinue  sales of its
Shares if management  believes that a substantial further increase may adversely
affect that Fund's ability to achieve its investment  objective.  In such event,
however, it is anticipated that existing Financial Institution customers in that
Fund would be permitted to continue to authorize  investment in such Fund and to
reinvest any dividends or capital gains distributions.

MINIMUM INVESTMENT

There is a $250,000  initial  aggregate  investment  minimum  by each  Financial
Institution.  The Funds  may,  in their  discretion,  waive this  minimum  under
certain  circumstances but, in such event, the minimum must be reached within 90
days of opening the  account.  Financial  Institutions  who do not  maintain the
$250,000  minimum  will be given the option of  requesting  their  customers  to
exchange into Investor  Shares if the required  minimum  investment for Investor
Shares is met or having their customers' Shares redeemed.

NET ASSET VALUE

The net asset  value  ("NAV")  of the Shares is  determined  at the close of the
regular trading session of the New York Stock Exchange  (normally 4:00 p.m., New
York time) each day that both the Exchange and the New York Federal Reserve Bank
are open.  NAV per  share is  determined  by  dividing  the  total  value of the
securities  and other assets,  less  liabilities,  by the total number of Shares
outstanding.  Portfolio securities are valued at their amortized cost. Amortized
cost  valuation  involves  valuing  an  instrument  at its cost  and  thereafter
assuming a constant amortization to maturity (or such other date as permitted by
Rule 2a-7) of any discount or premium.  If fluctuating  interest rates cause the
market  value of a  portfolio  to  deviate  more  than 1/2 of 1% from the  value
determined on the basis of amortized  cost,  the Trustees will consider  whether
any  action,  such as  adjusting  the  Share's  NAV to  reflect  current  market
conditions,  should be  initiated  to prevent any  material  dilutive  effect on
shareholders.

SHARE CERTIFICATES

Share  certificates  are not  available  for the Shares in order to maintain the
general  liquidity  that is  representative  of a money  market fund and to help
facilitate transactions in shareholder accounts.

REDEMPTIONS

Redemptions,  like  purchases,  may be effected  only  through  the  accounts of
participating  Financial  Institutions.  Your Financial Institution will provide
you with instructions on redeeming shares.

Shares  of any  Fund  may be  redeemed  on any  business  day.  Redemptions  are
processed  at the NAV  next  calculated  after  receipt  and  acceptance  of the
redemption order by the Fund.  Redemption proceeds will normally be wired to the
participating  Financial  Institution the business day following  receipt of the
redemption  order,  but in no event later than seven days after  receipt of such
order.

SHAREHOLDER COMMUNICATIONS

Shareholders will receive annual and semiannual  reports including the financial
statements  of the Funds that they have  authorized  for  investment  from their
Financial Institution.  Each report will show the investments owned by each Fund
and the market values thereof,  as well as other information about the Funds and
their operations. The Trust's fiscal year ends October 31.

JANUS MONEY MARKET FUNDS - SERVICE SHARES PROSPECTUS                          10



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