PARNASSUS INCOME FUND
497, 1999-05-10
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                          THE PARNASSUS INCOME TRUST
                                   PROSPECTUS
                                   MAY 1, 1999



PROSPECTUS-MAY 1, 1999
- --------------------------------------------------------------------------------
   The  Parnassus  Income  Trust  (the  "Trust")  is a mutual  fund,  managed by
Parnassus   Investments  (the  "Adviser").   The  Adviser  chooses  the  Trust's
investments  according  to social  standards  described in this  Prospectus.  In
general,  the Adviser  will  choose  investments  that it  believes  will have a
positive social impact.

   The Trust has three funds. The Equity Income Fund invests primarily in stocks
that pay a dividend,  and its  investment  objective is both current  income and
capital appreciation. The Fixed-Income Fund invests primarily in bonds and other
fixed-income  investments,  and its  investment  objective is current income and
preservation  of  capital.  The  California   Tax-Exempt  Fund  (for  California
residents  only) has as its investment  objective a high level of current income
exempt from federal and California  personal  income tax consistent with prudent
investment management.



TABLE OF CONTENTS
- --------------------------------------------------------------------------------
Investment Summary                       2       How to Purchase Shares       16
Trust Expenses                           7       How to Redeem Shares         18
The Legend of Mt. Parnassus              8       Dividends and Taxes          20
Investment Objective and Policies        9       Financial Highlights         21
Management                              13       General Information          23
The Adviser                             15


THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE  COMMISSION (SEC), AND THE SEC HAS NOT DETERMINED IF THIS PROSPECTUS IS
ACCURATE OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.


<PAGE>

INVESTMENT SUMMARY
- --------------------------------------------------------------------------------
                               EQUITY INCOME FUND
                               ------------------


Investment Objective and Principal Strategies

   The  Parnassus  Equity  Income Fund  invests  primarily  in stocks that pay a
dividend  and its  investment  objective  is both  current  income and growth of
capital.  The Fund  invests  primarily  in a  diversified  portfolio  of  equity
securities.  Equity securities may include common and preferred stock as well as
convertible  bonds.  At least 75% of the Fund's  total  assets will  normally be
invested in equity securities that pay interest or dividends.  The remaining 25%
may be invested in non-dividend  paying equity  securities,  in investment grade
debt securities or money market instruments.  The Fund seeks to invest in equity
securities that pay above-average  dividends and which the Adviser believes have
the capacity to raise  dividends in the future and also have the  potential  for
capital  appreciation.  To determine a company's prospects,  the Adviser reviews
the company's profit and loss statement, sales, earnings and dividend histories,
net cash flow and outlook for future earnings.

   The Fund takes  social as well as  financial  factors  into account in making
investment  decisions.  In general,  The Parnassus  Equity Income Fund looks for
companies  that  respect the  environment,  treat  their  employees  well,  have
effective equal employment  opportunity policies and good community relations as
well as ethical  business  dealings.  The Fund will not invest in companies that
are involved with gambling or manufacture alcohol or tobacco products.  The Fund
also screens out weapons  contractors and those that generate  electricity  from
nuclear power.


Principal Risks of Investing in the Equity Income Fund

   Investing  in the Fund may  result  in a loss of  money.  When you sell  your
shares,  they may be worth more or less than what you paid for them.  The Fund's
share price changes daily based on the value of its holdings.  Stock markets are
volatile  and stock values  fluctuate in response to the fortunes of  individual
companies and in response to general  market and economic  conditions  both here
and abroad. For best results,  investors should have a long-term perspective and
plan to hold their shares for at least three years.  (Legally,  shareholders may
redeem at any time, but the fund manager recommends a minimum three-year holding
period.)


Performance Information for the Equity Income Fund

   The bar chart below  provides an  indication of the risks of investing in the
Parnassus  Equity Income Fund by showing changes in the Fund's  performance from
year to year over a six-year period.  Prior to March 31, 1998, the Equity Income
Fund had a different investment  objective,  maintaining a balanced portfolio of
both stocks and bonds.  How the Fund performed in the past is not necessarily an
indication of how the Fund will perform in the future.


<PAGE>


   [GRAPHIC HERE]

     During the six-year period shown in the bar chart, the highest return for a
quarter was 23.4% (quarter ending December 31, 1998) and the lowest return for a
quarter was -11.6% (quarter ending September 30, 1998).

   Below is a table  comparing the  performance  of the Parnassus  Equity Income
Fund with the S&P 500 Index and the  average  equity  income  fund  followed  by
Lipper,  Inc.  Figures are  average  annual  returns  for the one and  five-year
periods and for the life of the Fund (since inception on August 31, 1992).

<TABLE>
<CAPTION>

- ---------------------------------------------------------------------------------------------------------
Average Annual Total Returns             Parnassus Equity             S&P 500        Lipper Equity Income
for periods ending 12/31/98                 Income Fund               Index              Fund Average
- ---------------------------------------------------------------------------------------------------------
<S>                                           <C>                     <C>                   <C>   
One Year                                      11.05%                  28.58%                10.89%
Five Years                                    12.13%                  24.01%                16.71%
Since Inception 8/31/92                       13.51%                  21.48%                16.32%

<FN>

Past  performance  is no  guarantee  of future  returns.  Investment  return and
principal will fluctuate and an investor's shares,  when redeemed,  may be worth
more or less than their original cost.

The S&P 500 is the  Standard & Poor's  Composite  Index of 500 stocks,  a widely
recognized index of common stock prices. An individual cannot invest directly in
the S&P 500 and the index does not take any  investing  expenses into account as
do the figures for the Parnassus  Equity Income Fund and Lipper's average equity
income fund.
</FN>
</TABLE>


                                FIXED-INCOME FUND
                                -----------------

Investment Objective and Principal Strategies

   The Parnassus  Fixed-Income Fund invests in a diversified  portfolio of bonds
and other fixed-income  instruments and its investment objective is a high level
of current  income  consistent  with safety and capital  preservation.  The Fund
invests in  investment  grade bonds  which means they are rated  within the four
highest  categories  as determined by a  nationally-recognized  rating  service.
Ordinarily,  at least 65% of the Fund's  total net assets  will be  invested  in
bonds rated "A" or better.

   The Fund may  invest in a  combination  of  long-term,  intermediate-term  or
short-term  fixed-income  securities  depending on market  conditions  and these
securities may also have floating or variable  interest rates. The portfolio may
be comprised of U.S. Government  obligations,  corporate bonds, preferred stock,
convertible  preferred stock and convertible  bonds. The Fund's average weighted
maturity will be between 5 and 20 years.

   The Fund takes  social as well as  financial  factors  into account in making
investment  decisions.  In general,  the Parnassus  Fixed-Income  Fund looks for
companies  that  respect the  environment,  treat  their  employees  well,  have
effective equal employment  opportunity policies and good community relations as
well as ethical  business  dealings.  The Fund will not invest in companies that
are involved with gambling or manufacture alcohol or tobacco products.  The Fund
also screens out weapons  contractors and those that generate  electricity  from
nuclear power.


<PAGE>

Principal Risks of Investing in the Fixed-Income Fund

   Investing  in the  Fund may  result  in a loss of  money  when you sell  your
shares. The Fund's share price changes daily based on the value of its holdings.
The value of the Fund will vary  inversely  with changes in interest  rates.  As
interest  rates go up, the net asset  value  (NAV) will  likely go down,  and as
interest  rates  drop,  the NAV of the Fund  will  likely  go up.  This  Fund is
intended  for  investors  who can accept  the fact that there will be  principal
fluctuations. The NAV of the Fund will also be affected by other factors such as
credit risk and general  market  conditions.  Credit risk involves an individual
company's being unable to make payments on its financial  obligations  either in
whole or in part.  When you sell your shares of the Fund, they may be worth more
or less than what you paid for them.


Performance Information for the Fixed-Income Fund

   The bar chart below  provides an  indication of the risks of investing in the
Parnassus  Fixed-Income  Fund by showing changes in the Fund's  performance from
year to year over a six-year  period.  How the Fund performed in the past is not
necessarily an indication of how the Fund will perform in the future.

   [GRAPHIC HERE]

   During the six-year  period shown in the bar chart,  the highest return for a
quarter  was 7.5%  (quarter  ending June 30,  1995) and the lowest  return for a
quarter was -4.4% (quarter ending June 30, 1994).

   Below is a table comparing the performance of the Parnassus Fixed-Income Fund
with the Lehman  Government/Corporate  Bond Index and the average  A-rated  bond
fund followed by Lipper, Inc. Figures are average annual returns for the one and
five-year  periods and for the life of the Fund (since  inception  on August 31,
1992).

<TABLE>
<CAPTION>

- ----------------------------------------------------------------------------------------------------------
Average Annual Total Returns            Parnassus           Lehman Government/        Lipper A-Rated Bond
for periods ending 12/31/98         Fixed-Income Fund      Corporate Bond Index          Fund Average
- ----------------------------------------------------------------------------------------------------------
<S>                                       <C>                      <C>                       <C>  
One Year                                  6.97%                    9.47%                     7.47%
Five Years                                6.90%                    7.30%                     6.29%
Since Inception 8/31/92                   7.58%                    7.49%                     6.89%
<FN>

Past  performance  is no  guarantee  of future  returns.  Investment  return and
principal will fluctuate and an investor's shares,  when redeemed,  may be worth
more or less than their original cost.

The  Lehman  Government/Corporate  Bond  Index  is  a  widely  recognized  index
measuring  the  performance  of bonds  and  other  fixed-income  securities.  An
individual  cannot  invest  directly  in the index  and the index  does not take
investing  expenses  into  account as do the  figures for the  Parnassus  Fixed-
Income Fund and Lipper's average A-rated bond fund.
</FN>
</TABLE>


<PAGE>

                           CALIFORNIA TAX-EXEMPT FUND
                           --------------------------

Investment Objective and Principal Strategies

   The Parnassus California Tax-Exempt Fund is available to California residents
only.  It invests in a diversified  portfolio of  tax-exempt,  investment  grade
securities  issued by California state and local governments and by other public
authorities.  Its investment  objective is to provide high current income exempt
from both federal and California personal income tax.

   The Fund invests in investment  grade bonds which means they are rated within
the four highest  categories  as determined  by a  nationally-recognized  rating
service.  No more than 20% of the Fund's  portfolio  will be invested in the 4th
highest category.  Under normal circumstances,  the Fund will invest 100% of its
assets in California municipal  obligations.  However, it could invest up to 20%
of its assets in  private  activity  bonds  that may be  subject to the  federal
alternative minimum tax.

   The Fund takes  social as well as  financial  factors  into account in making
investment decisions. The Parnassus California Tax-Exempt Fund seeks a portfolio
that will have a positive  social and  environmental  impact.  Examples would be
bonds that support schools, libraries, hospitals, mass transit, low and moderate
income housing and pollution control facilities.


Principal Risks of Investing in the California Tax-Exempt Fund

   Investing  in the  Fund may  result  in a loss of  money  when you sell  your
shares. The Fund's share price changes daily based on the value of its holdings.
The Fund's average  weighted  maturity will be 5 years or more. The value of the
Fund will vary  inversely with changes in interest  rates.  As interest rates go
up, the net asset value (NAV) will likely go down,  and as interest  rates drop,
the NAV of the Fund will likely go up. This Fund is intended for  investors  who
can  accept  the fact that there  will be  principal  fluctuations.  As the Fund
invests primarily in California  municipal  securities,  there are special risks
involved. The NAV of the Fund will be affected by factors such as changes to the
state  constitution  regarding  taxes,  changes  in the  federal  tax  status of
municipal  securities  and  changes  in bond  ratings  based  on the  California
economy.  When you sell your shares of the Fund,  they may be worth more or less
than what you paid for them.


Performance Information for the California Tax-Exempt Fund

   The bar chart below  provides an  indication of the risks of investing in the
Parnassus   California   Tax-Exempt  Fund  by  showing  changes  in  the  Fund's
performance from year to year over a six-year period.  How the Fund performed in
the past is not  necessarily  an  indication of how the Fund will perform in the
future.


<PAGE>

   [GRAPHIC HERE]

     During the six-year period shown in the bar chart, the highest return for a
quarter was 8.0%  (quarter  ending March 31,  1995) and the lowest  return for a
quarter was -5.7% (quarter ending March 31, 1994).

   Below  is a table  comparing  the  performance  of the  Parnassus  California
Tax-Exempt Fund with the Lehman Municipal Bond Index and the average  California
Municipal Bond Fund followed by Lipper,  Inc. Figures are average annual returns
for the one and five-year  periods and for the life of the Fund (since inception
on August 31, 1992).
<TABLE>
<CAPTION>

- ---------------------------------------------------------------------------------------------------------
                                                                                        Lipper California
Average Annual Total Returns           Parnassus California       Lehman Municipal        Municipal Bond
for periods ending 12/31/98               Tax-Exempt Fund            Bond Index            Fund Average
- ---------------------------------------------------------------------------------------------------------
<S>                                            <C>                      <C>                    <C>  
One Year                                       6.12%                    6.48%                  5.77%
Five Years                                     6.19%                    6.23%                  5.48%
Since Inception 8/31/92                        7.18%                    7.23%                  6.65%
<FN>

Past  performance  is no  guarantee  of future  returns.  Investment  return and
principal will fluctuate and an investor's shares,  when redeemed,  may be worth
more or less than their original cost.

The Lehman  Municipal Bond Index is a recognized index measuring the performance
of municipal bonds in the United States. An individual cannot invest directly in
the index and the index does not take into account investing  expenses as do the
figures  for the  Parnassus  California  Tax-Exempt  Fund and  Lipper's  average
California Municipal bond fund.
</FN>
</TABLE>

<PAGE>

TRUST EXPENSES
- --------------------------------------------------------------------------------
   This table  describes  the fees and expenses  that you may pay if you buy and
hold shares of the Trust.
<TABLE>
<CAPTION>
                                                                      Equity      Fixed-       California
                                                                      Income      Income     Tax- Exempt
Shareholder Fees (paid by the investor directly)                        Fund        Fund             Fund
- ----------------------------------------------------------------------------------------------------------
<S>                                                                   <C>         <C>        <C>          
Maximum Sales Charge (load) Imposed on Purchases                        None        None             None
Redemption Fees                                                         None        None             None

Annual Trust Operating Expenses (paid from Trust assets)
- ----------------------------------------------------------------------------------------------------------
Management Fees (before fee waiver)                                    0.74%       0.50%            0.50%
12b-1/Distribution Fees                                                 None        None             None
Other Expenses                                                         0.55%       0.69%            0.47%
Total Annual Trust Operating Expenses                                  1.29%       1.19%            0.97%
Fee Waiver/Expense Reimbursement                                       0.19%       0.35%            0.25%
Net Expenses                                                           1.10%       0.84%            0.72%
</TABLE>


   The  Examples  in this table are  intended  to help you  compare  the cost of
investing in the Trust with the cost of investing  in other  mutual  funds.  The
Examples  assume  that you  invest  $10,000  in each of the  funds  for the time
periods  indicated  and  then  redeem  all of your  shares  at the end of  those
periods.  The Examples also assume that your  investments have a 5%* return each
year and that the  funds'  operating  expenses  remain the same.  Although  your
actual costs may be higher or lower, based on these assumptions, your cost would
be as follows:

                                ONE YEAR    THREE YEARS   FIVE YEARS   TEN YEARS

  Equity Income Fund              $131         $409          $708       $1,556

  Fixed-Income Fund               $121         $378          $654       $1,443

  California Tax-Exempt Fund      $ 99         $309          $536       $1,190



   The expenses shown above are the total fees you would pay throughout the time
period  indicated -- not ones you would pay every year. For example,  the figure
for ten years is not the  expense  figure for that  single  year,  but the total
cumulative  expenses  a  shareholder  would  have paid for the  entire  ten-year
period.

   The figures in the table above also overstate the expenses you would actually
pay since they are based on the Total Annual Trust Operating Expenses before fee
waivers/reimbursements  and not on the Net  Expenses.  However,  the  Adviser is
contractually  obligated to provide the fee waivers  indicated during the period
of this  prospectus:  May 1, 1999  through  April  30,  2000.  The SEC,  though,
requires that the  calculations  be made on the basis of pre-waiver  expenses to
show what expenses might potentially be in the future.



<PAGE>


   From time to time, a fund may direct brokerage  commissions to firms that may
pay certain  expenses of a fund subject to "best  execution."  This is done only
when brokerage  costs are reasonable and the fund  determines that the reduction
of expenses is in the best interest of the fund's shareholders.  No fund engaged
in such  directed  brokerage  in 1998.  If a fund  does so in the  future,  such
directed  brokerage is expected to occur on an irregular basis, so the effect on
the expense ratios cannot be calculated with any degree of certainty.

* The 5% return figure is an example that  regulations  require all mutual funds
to use as an illustration.  It should not be considered a representation of past
or future performance.  Actual performance and expenses may be greater or lesser
than those shown.




THE LEGEND OF MT. PARNASSUS
- --------------------------------------------------------------------------------
   Parnassus  is a mountain  in central  Greece  whose twin peaks rise more than
8,000 feet above sea level.  A dense forest covers the slopes of Mt.  Parnassus,
but the summit is rocky and, most of the time,  covered with snow.  The mountain
plays a  prominent  role in  Greek  mythology  because  on its  southern  slope,
overlooking the Gulf of Corinth, lies Delphi, site of the famous oracle.

   Originally,  the oracle  belonged to Gaia, the earth goddess.  Later,  Mother
Earth was worshipped under the name Delphyne and she controlled the oracle along
with her serpent-son,  Python,  and her  priestess-daughters  who controlled the
rites.  Eventually,  the Greek god, Apollo,  took over the site, doing away with
Python, but keeping the priestesses.

   The  most  "Greek"  of  the  gods,  Apollo   represented   enlightenment  and
civilization and presided over the establishment of cities.  Identified with the
development  of Greek codes of law,  Apollo was also the god of light,  a master
musician and a skilled archer.  Legend has it that Python,  an enormous  serpent
raised  in the  caves of Mt.  Parnassus,  controlled  the site of  Delphi.  When
Apollo,  representing  civilization,  challenged Python,  representing  anarchy,
there was a heroic struggle, but the god finally killed the dragon by shooting a
hundred arrows into its body.

   There  were  many  oracles  in  ancient  Greece,  but only the one at  Delphi
achieved  a record of  reliability.  Apollo's  temple at Delphi  soon  became an
enormous  storehouse of treasures that were gifts of those who had consulted the
oracle.

   The oracle communicated through the voice of a priestess who spoke while in a
trance.  The priests of Delphi,  who  interpreted  the sayings of the priestess,
obtained a great deal of knowledge  and  information  from talking to the people
who came from all over the Greek world to consult at the shrine of Apollo. Quite
often, the oracle went against the prevailing wisdom of the time and frequently,
the proud were humbled and the lowly were justified.

<PAGE>



INVESTMENT OBJECTIVES AND POLICIES
- --------------------------------------------------------------------------------

Social Policy

   The Adviser looks for certain  social  policies in the companies in which the
Trust invests.  These social policies are: (1) treating  employees  fairly;  (2)
sound environmental protection policies; (3) a good equal employment opportunity
program;  (4) quality products and services;  (5) a record of civic  commitment;
and (6) ethical business practices. Obviously, no company will be perfect in all
categories,  but the Adviser makes value  judgments in deciding which  companies
best meet the criteria.  The Adviser also  considers  social  factors other than
these six (as  discussed  under the  investment  objectives of each of the three
Funds).

   Although the Trust  emphasizes  positive  reasons for investing in a company,
our operating policies call for excluding  companies that manufacture alcohol or
tobacco  products or are  involved  with  gambling.  The Trust also  screens out
weapons contractors and those that generate electricity from nuclear power.

   The social criteria of The Parnassus  Income Trust limit the  availability of
investment  opportunities.  However,  the Trustees and the Adviser  believe that
there are  sufficient  investments  available  that can meet the Trust's  social
criteria and still enable each fund to provide a competitive rate of return.


                               EQUITY INCOME FUND
                               ------------------

   The investment objective of the Equity Income Fund is both current income and
capital  appreciation.  The Fund tries to achieve  this  objective  by investing
primarily in a diversified portfolio of equity securities. Equity securities may
include common and preferred  stock as well as securities  that are  convertible
into these  instruments such as convertible  bonds. As an operating  policy,  at
least 75% of the  Fund's  total  assets  will  normally  be  invested  in equity
securities  that pay a dividend  (or  interest in the case of  convertible  debt
instruments),  and up to 25% of the  Fund's  total  assets  may be  invested  in
non-dividend paying equity securities, in investment grade debt securities or in
money market instruments.  However,  for temporary defensive purposes,  the Fund
may invest all its assets in money market instruments or investment grade debt.

   The  Fund  seeks to  invest  in  equity  securities  that  pay  above-average
dividends and which the Adviser believes have the capacity to raise dividends in
the future and also have the potential for capital appreciation.  The Fund seeks
to achieve a yield for its shareholders that exceeds the yield on the securities
comprising  the S&P 500  Composite  Stock Price Index.  Issuers of securities in
which the Fund invests must meet the social criteria stated in this Prospectus.

   The Equity Income Fund may, as an operating policy,  also invest up to 10% of
its assets in  community  development  loan  funds  such as those  that  provide
financing for small business and for low and moderate income  housing.  The Fund
will not make loans to a project  itself,  but rather  will  invest  money in an
intermediary community loan fund. With projects having a strong, positive social
impact,  the Fund may invest in  obligations  issued by community  loan funds at
below market interest rates.  Generally,  there is no secondary market, and thus
no liquidity,  for these  investments.  In general,  the Fund seeks to invest in
community  organizations that have had a successful record in making these kinds
of loans and that are deemed creditworthy by the Adviser.


<PAGE>

Risk Factors

   As with all investments,  there are a number of risk factors  associated with
the Equity  Income Fund.  Equity  securities  in the Fund pose a risk in that an
individual  enterprise  may fall on hard  times and  operate  with  little or no
profits;  this  would  depress  the price of its  stock.  There  are also  risks
associated  with the economic  cycle (e.g., a recession) as well as market risks
that might  sharply  reduce the  valuation of all stocks or stocks in a specific
industry.  Since the Equity  Income Fund invests  primarily in stocks that pay a
dividend, the portfolio will be invested in larger, more mature companies. These
companies tend to be safer and less volatile than those companies that don't pay
a dividend.

   With preferred stock and higher-yielding  common stocks such as utilities,  a
major risk is increased  interest  rates that will  decrease the market value of
the securities in question.  For a fuller description of interest rate risk, see
the Risk Factors section under Fixed-Income Fund.

   There are also special risks involved with community development  investments
which may  comprise as much as 10% of the Fund.  These  investments  do not have
liquidity,  and  community  loan  funds do not have the same  kind of  financial
resources as do large  commercial  enterprises.  Moreover,  there is no publicly
available  track  record  for  community  loan funds so it is hard to assess the
history of these kinds of investments.  In fact, one of the social objectives of
The Parnassus Income Trust is to establish a publicly available track record for
community development investments.


<PAGE>

                                FIXED-INCOME FUND
                                -----------------

   The investment  objective of the Fixed-Income Fund is a high level of current
income  consistent  with safety and capital  preservation.  The Adviser seeks to
achieve this  objective by  investing  in a  diversified  portfolio of bonds and
other  fixed-income  instruments  that are rated investment  grade.  "Investment
grade"  means  rated  within the four  highest  categories  as  determined  by a
nationally-recognized  rating  service such as Standard & Poor's,  a division of
The  McGraw-Hill  Companies,  Inc.  ("Standard  & Poors") or  Moody's  Investors
Service, Inc. ("Moody's"). Securities in the lowest of these four categories are
considered  investment grade, but they may have speculative elements about them.
The  Fixed-Income  Fund  ordinarily  will have at least 65% of its net assets in
securities  rated "A" or better (i.e.,  the three highest  categories).  See the
Appendix in the SAI for a  description  of bond ratings.  Obligations  issued or
guaranteed by the United States  Government,  its agencies or  instrumentalities
need not have a rating.

   The  Fixed-Income  Fund  may  invest  in  long-term,   intermediate-term   or
short-term  fixed-income  securities or any  combination  thereof,  depending on
market  conditions,  and these  securities  may also have  floating  or variable
interest rates. Securities in this Fund may include preferred stock, convertible
preferred stock and convertible bonds.

   The Fixed-Income Fund invests only in investment grade  securities.  The Fund
will not invest in  "high-yield"  or "junk"  bonds.  Because of this emphasis on
quality and safety,  the Fund's yield may not be as high as it  otherwise  might
be.

     This Fund may, as an operating policy,  also invest up to 10% of its assets
in community  development  loan funds. See the section on the Equity Income Fund
for details.


Risk Factors

   The  Adviser  anticipates  that  the  Fixed-Income  Fund's  average  weighted
maturity  will be  between  5 and 20  years.  Because  of this  relatively  long
maturity,  the value of this Fund will vary  inversely  with changes in interest
rates.  As interest  rates go up, the net asset value (NAV) will likely go down,
and as  interest  rates  drop,  the NAV of this  Fund  will  likely  go up.  The
Fixed-Income  Fund is intended for  investors who can accept the fact that there
will be  principal  fluctuations.  The NAV of the Fund may also be  affected  by
factors  other  than  interest  rates  such as credit  risk and  general  market
factors.


<PAGE>

                           CALIFORNIA TAX-EXEMPT FUND
                           --------------------------

   The investment objective of the California Tax-Exempt Fund is to provide high
current income exempt from both federal and California personal income tax while
choosing a portfolio that will have a positive social and environmental  impact.
The Adviser  pursues this  objective by investing in a diversified  portfolio of
tax-exempt,  investment  grade  securities  issued by California state and local
governments  and by  other  public  authorities.  This  Fund  is for  California
residents only.

   For  temporary  purposes,  the Fund may  invest  up to 10% of its  assets  in
no-load,  open-end  investment  companies which invest in tax-exempt  securities
with maturities of less than one year ("tax-exempt  money market funds") but the
Fund will put no more than 5% of its assets into any one fund.

   Normally,   the  Fund  will  have  all  its  assets  invested  in  tax-exempt
securities,  but may  temporarily  invest in  short-term  taxable  money  market
instruments.  Temporary  investments  will be limited to  obligations  issued or
guaranteed by the United States Government,  its agencies or  instrumentalities,
prime   commercial   paper  or   deposits   with   federally-insured   financial
institutions,  and the Fund may engage in repurchase transactions involving U.S.
Government securities.


Risk Factors

   Since  the  California   Tax-Exempt  Fund  invests  primarily  in  California
municipal  securities,  there are special risks  involved.  Changes in the State
constitution  and other  laws  raise  questions  about the  ability of State and
municipal issuers to obtain sufficient revenue to pay their bond obligations. In
particular, California voters have approved amendments to the State constitution
which limit  property  taxes as well as the ability of taxing  entities to raise
other types of taxes. In addition,  another constitutional amendment,  popularly
known  as the Gann  Initiative,  limits  increases  in  revenue  appropriations.
Federal  legislative  proposals have threatened the tax-exempt  status or use of
mu-nicipal securities.

   The Fund  typically  invests in securities  with  maturities of more than one
year, and the average  maturity of all securities  will usually be five years or
more. If the Adviser determines that market conditions warrant a shorter average
maturity,  the  Fund  will be  adjusted  accordingly.  Since  the  value of debt
obligations  typically  varies inversely with changes in interest rates, the net
asset value (NAV) per share of the Fund will also  fluctuate in this manner.  As
interest  rates go up, the NAV will likely go down and as  interest  rates drop,
the NAV will  likely go up.  The  California  Tax-Exempt  Fund is  intended  for
investors  who can accept the fact that  there will be  principal  fluctuations.
(See the SAI for a further discussion of risk factors involved with investing in
California tax-exempt securities.)


<PAGE>


MANAGEMENT
- --------------------------------------------------------------------------------
   The Trustees and officers  are listed  below  together  with their  principal
occupations during at least the past five years.

   Jerome L. Dodson*,  55, President and Trustee, is also President of Parnassus
Investments.  From  1975 to 1982,  Mr.  Dodson  served  as  President  and Chief
Executive Officer of Continental Savings in San Francisco. From 1982 to 1984, he
was President of Working  Assets Money Fund and he also served as a Trustee from
1988 to 1991.  He is a graduate of the  University of California at Berkeley and
of Harvard  University's  Graduate  School of Business  Administration  where he
concentrated in finance.  Mr. Dodson is the Fund's portfolio manager. He is also
President and Trustee of The Parnassus Fund.

   David L. Gibson, 59, Trustee, is an attorney in private practice specializing
in  taxation  and  estate  planning.  From  1973 to 1984,  he was with the Crown
Zellerbach Corporation where he served as tax counsel and, later, as Director of
Public Affairs.  Mr. Gibson is active in civic affairs and his special interests
include  senior  and  environmental  issues.  He holds a  Bachelor's  degree  in
business  administration from Virginia Polytechnic Institute, an MBA from Golden
Gate  University,  a J.D. from  Washington  and Lee  University  and an LLM from
William and Mary. Mr. Gibson is also a Trustee of The Parnassus Fund.

     Gail  L.  Horvath,  49,  Trustee,  is  co-owner  of  Just  Desserts,  a San
Francisco-based  bakery and cafe. A co-founder of Just Desserts,  her experience
includes market  research,  product planning and product  development.  For four
years,  she served as a Director of  Continental  Savings.  She is a graduate of
Ohio State University. Ms. Horvath is also a Trustee of The Parnassus Fund.

     Herbert A. Houston,  55, Trustee, is a health care consultant.  Previously,
he spent 12 years as the Chief  Executive  Officer  of the  Haight-Ashbury  Free
Clinics,  Inc. Mr.  Houston is on the Board of the Alameda County Medical Center
and is a Health  Commissioner for Alameda County. He is a graduate of California
State University at Hayward and holds a Master's degree in Public Administration
& Health  Services from the  University of Southern  California.  Mr. Houston is
also a Trustee of The Parnassus Fund.

     Cecilia C.M. Lee, 55, Trustee,  is President of  hybridArts.com,  a Silicon
Valley-based electronics firm. She is a San Francisco Asian Art commissioner and
serves on the board of public television  station KQED. Ms. Lee is a Director of
the Tech  Museum of  Innovation  and also on the  Advancement  Board of the West
Valley-Mission  Community  College.  She received a  Bachelor's  degree from the
National  Music and Art  Institute  of Taiwan.  Ms. Lee is also a Trustee of The
Parnassus Fund.

   Leo T. McCarthy, 68, Trustee, is President of the Daniel Group, a partnership
involved in foreign trade. His current  directorships  include Linear Technology
and Open Data Systems. He served eighteen years as a Regent of the University of
California.  From 1969 to 1982,  he served as a member of the  California  State
Assembly,  six  years as  Speaker.  From 1983 to 1995,  he served as  Lieutenant
Governor of the State of California where his major  responsibility was economic
development.  He holds a B.S.  from the  University  of San Francisco and a J.D.
from San Francisco Law School and is admitted to practice law in California. Mr.
McCarthy  is also a Trustee  of The  Parnassus  Fund and a  Director  of Forward
Funds, another mutual fund.

<PAGE>

   Donald E. O'Connor, 62, Trustee, is a retired executive who spent 28 years as
Vice President of Operations for the Investment Company Institute, (the "ICI" is
the trade association of the mutual fund industry).  During that period, he also
spent 10 years as Chief Operating  Officer of the ICI Mutual Insurance  Company.
Prior to joining the ICI, he spent six years with the SEC,  including four years
as Branch Chief of Market Surveillance.  He currently serves as a Trustee of the
Advisors  Series  Trust,  another  mutual  fund.  He is a graduate of The George
Washington  University and holds a Masters in Business  Administration  from the
same institution.  Mr. O'Connor is also a Trustee of The Parnassus Fund.

   Howard M. Shapiro,  67, Trustee, is a consultant to non-profit  organizations
specializing   in  marketing,   fund-raising   and   organizational   structure.
Previously,  he  worked  for 28  years  in  marketing,  advertising  and  public
relations.  He is Chairman of the Board of the Portland Housing Authority and is
Vice  Chairman of the Board of the Albina  Community  Bank in Portland.  He also
serves on the Board of Oregon's State Accident  Insurance Fund and the Multnomah
County  Investment  Council.  Mr.  Shapiro is a graduate  of the  University  of
Washington.  He is also a Trustee of The  Parnassus  Fund.  He is no relation to
Joan Shapiro.

   Joan Shapiro, 56, Trustee, is a consultant in corporate social responsibility
development  banking and community  reinvestment.  For 20 years, she worked with
the South Shore Bank of Chicago, most recently as Executive Vice President.  She
is a former  President  of the  Social  Investment  Forum,  the  national  trade
association of the social  investment  industry.  Active in Chicago's  civic and
cultural  life for 25 years,  she is a Governor  of  International  House of the
University of Chicago and a member of the President's  Council of Cornell Women.
She is a graduate of Cornell  University.  Ms.  Shapiro is also a Trustee of The
Parnassus Fund. She is no relation to Howard Shapiro.

     Howard Fong, 53, Vice  President and  Treasurer,  is also Vice President of
Parnassus  Investments.  Mr.  Fong  began  his  career as an  examiner  with the
California  Department  of  Savings  and Loan.  In 1979,  he joined  Continental
Savings where he worked until 1988,  most recently as Senior Vice  President and
Chief  Financial  Officer.  He  joined  The  Parnassus  Fund in 1989.  Mr.  Fong
graduated  from  San  Francisco  State  University  with a  degree  in  business
administration.  Mr. Fong is also Vice  President and Treasurer of The Parnassus
Fund.

     Susan Loughridge,  50, Vice President and Shareholder Services Manager. Ms.
Loughridge is a graduate of  University  of Arizona.  She began her career as an
examiner  for the  Federal  Home Loan Bank  Board and later  joined  Continental
Savings  where she  managed  Branch  Operations  until  1991.  She has served as
Shareholder Services Manager at Parnassus Investments since 1993. Ms. Loughridge
is also Vice President of The Parnassus Fund.

   Richard D. Silberman,  61, Secretary, is an attorney specializing in business
law. He has been general  counsel to The Parnassus Fund since its inception.  He
holds a Bachelor's  degree in business  administration  from the  University  of
Wisconsin, a Bachelor of Law, also from the University of Wisconsin and a Master
of Law from  Stanford  University.  He is a member  of both  the  Wisconsin  and
California  Bars.  Mr.  Silberman is also  Secretary and general  counsel of The
Parnassus Fund.

* Denotes "interested" trustee as defined in the Investment Company Act of 1940.


<PAGE>

THE ADVISER
- --------------------------------------------------------------------------------
   Parnassus  Investments (the "Adviser"),  One Market-Steuart  Tower #1600, San
Francisco,  California 94105 acts as investment  adviser to each fund subject to
the  control of the  Trust's  Board of  Trustees,  and as such,  supervises  and
arranges the purchase and sale of securities held in the funds' portfolios.  The
Adviser has been the investment manager of The Parnassus Fund since 1985 and The
Parnassus Income Trust since 1992.

   For its services,  the Trust,  under an Investment  Advisory  Agreement  (the
"Agreement") between the Trust and the Adviser, pays the Adviser a fee, computed
and payable at the end of each month,  at the following  annual  percentages  of
each Fund's average daily net assets:  for the Equity Income Fund,  0.75% of the
first $30  million,  0.70% of the next $70 million and 0.65% of the amount above
$100 million; and for the Fixed-Income Fund and the California  Tax-Exempt Fund,
the fee is 0.50% of the first $200  million,  0.45% of the next $200 million and
0.40% of the amount above $400 million.  However,  the  following  were actually
charged in 1998.  For the Equity Income Fund,  the  investment  advisory fee was
0.50%.  Parnassus  Investments received net advisory fees totaling $196,661 from
the  Equity  Income  Fund  for  the  year  ended  December  31,  1998.  For  the
Fixed-Income Fund, the investment advisory fee was 0.10%.  Parnassus Investments
received net advisory fees totaling $10,393 from the  Fixed-Income  Fund for the
year ended December 31, 1998. For the California Tax-Exempt Fund, the investment
advisory  fee was  0.20%.  Parnassus  Investments  received  net  advisory  fees
totaling $14,135 from the California Tax-Exempt Fund for the year ended December
31, 1998.

   Parnassus Investments has agreed to reduce its investment advisory fee to the
extent  necessary to limit total  operating  expenses to 1.25% of net assets for
the  Equity  Income  Fund  and  1.00% of net  assets  for the  Fixed-Income  and
California  Tax-Exempt  Funds. For the period from May 1, 1999 through April 30,
2000, the Adviser has agreed to limit its fees to 0.55% of the net assets of the
Equity Income Fund, 0.15% of the net assets of the  Fixed-Income  Fund and 0.25%
of the net assets of the California Tax-Exempt Fund.


<PAGE>


HOW TO PURCHASE SHARES
- --------------------------------------------------------------------------------

Direct Purchase Of Shares

   To purchase shares, an investor should complete and mail the application form
along with a check payable to The Parnassus  Income Trust.  It should be sent to
the Trust at the following address.

                                    The Parnassus Income Trust
                                    One Market-Steuart Tower #1600
                                    San Francisco, California 94105

   An initial  investment  must be at least  $2,000 per fund  except for certain
employee benefit plans or tax qualified retirement plans (such as IRAs or SEPs),
Parnassus  Automatic  Investment Plan (PAIP) and accounts opened pursuant to the
Uniform  Gifts to Minors  Act  ("UGMA")  or  Uniform  Transfers  to  Minors  Act
("UTMA"),  which have a $500 minimum.  Additional  investments  for all accounts
must be at least $50.  Parnassus  Investments  reserves  the right to reject any
order.  With  additional  investments,  shareholders  should  write the name and
number of the account on the check. Checks do not need to be certified,  but are
accepted  subject to collection  and must be drawn in United  States  dollars on
United States banks.  Investments  in the Equity Income Fund and the  California
Tax-Exempt  Fund,  if received  before 1:00 p.m.  San  Francisco  time,  will be
processed at the net asset value  calculated  on the same  business day they are
received.  If an investment in either of these Funds is received after 1:00 p.m.
San Francisco time, it will be processed on the next business day.

   An investment  in the  Fixed-Income  Fund, if received  before 12:00 noon San
Francisco time, will be processed at the net asset value  calculated on the same
business day it is received.  An investment  in this Fund  received  after 12:00
noon San Francisco time will be processed on the next business day.


Other Information

   The Trust also offers  additional  services to investors  including plans for
the systematic  investment and withdrawal of money as well as IRA and SEP plans.
Information about these plans is available from Parnassus Investments.

   There is no sales charge for the purchase of Trust shares,  but investors may
be  charged  a  transaction  or  other  fee  in  connection  with  purchases  or
redemptions  of Trust  shares  on  their  behalf  by an  investment  adviser,  a
brokerage firm or other financial institution.


Purchases Via Parnassus Automatic Investment Plan (PAIP)

   After making an initial  investment to open a Fund account ($500 minimum),  a
shareholder may purchase additional Fund shares ($50 minimum) via the PAIP. On a
monthly or quarterly  basis,  your money will  automatically be transferred from
your bank  account to your fund  account on the day of your  choice (3rd or 18th
day of the month).  You can elect this option by filling out the PAIP section on
the new account form.  For further  information,  call the Trust and ask for the
free brochure called "Automatic Investing and Dollar-Cost Averaging."


<PAGE>

Net Asset Value

   The net asset value (NAV) for each fund will usually be  calculated  on every
day the New York Stock Exchange (NYSE) is open for trading  ("business day") and
on any other day there is a sufficient  degree of trading in investments held by
the Fund to affect the net asset  value.  The NAV of the Equity  Income Fund and
the  California  Tax-Exempt  Fund will usually be  calculated as of the close of
trading on the NYSE, usually 4:00 p.m. Eastern time. The NAV of the Fixed-Income
Fund will usually be  determined as of one hour prior to the close of trading on
the NYSE,  usually 3:00 p.m.  Eastern time. The NAV may not be determined on any
day that there are no transactions in shares of the Fund.

   The net  asset  value per  share is the  value of a fund's  assets,  less its
liabilities,  divided  by the  number of  outstanding  shares of that  fund.  In
general,  the value of a fund's portfolio securities is the market value of such
securities. However, securities and other assets for which market quotations are
not readily available are valued at their fair value as determined in good faith
by the Adviser under procedures established by and under the general supervision
and responsibility of the Trust's Board of Trustees.




HOW TO REDEEM SHARES
- --------------------------------------------------------------------------------
   You may sell or redeem  your  shares by  offering  them for  "repurchase"  or
"redemption"  directly to the Trust.  To sell your shares to the Trust (that is,
to redeem your shares),  you must send your written instructions to the Trust at
One  Market-Steuart  Tower #1600, San Francisco,  California 94105. You may also
send your redemption  instructions by FAX to (415) 778-0228 if the redemption is
less than $25,000. Your shares will be redeemed at the NAV next determined after
receipt by the Trust of your  written  instructions  in proper  form.  Give your
account number and indicate the number of shares you wish to redeem.  All owners
of the account  must sign unless the  account  application  states that only one
signature is necessary for  redemptions.  All redemption  checks must be sent to
the address of record on the account. The Trust must have a change-of-address on
file for 30 days before we send  redemption  or  distribution  checks to the new
address.  Otherwise,  we require a signature guarantee or the check must be sent
to the old address.  If you wish to have the  redemption  proceeds  sent by wire
transfer or by overnight  mail,  there will be a charge of $10 per  transaction.
Wiring funds will require an original  signature  guarantee.  The Trust  usually
requires  additional  documents  when  shares  are  registered  in the name of a
corporation,  agent or fiduciary or if you are a surviving  joint owner.  In the
case of a corporation,  we usually require a corporate  resolution signed by the
secretary.  In the  case  of an  agent  or  fiduciary,  we  usually  require  an
authorizing document. In the case of a surviving joint owner, we usually require
a copy of the death certificate. Contact the Trust by phone at (800) 999-3505 if
you have any questions about requirements for redeeming your shares.

   If the Trust has  received  payment for the shares you wish to redeem and you
have provided the  instructions  and any other documents needed in correct form,
the  Trust  will  promptly  send you a check  for the  proceeds  from the  sale.
Ordinarily, the Trust must send you a check within seven days unless the NYSE is
closed for days other than weekends or holidays. However, payment may be delayed
for any shares  purchased by check for a reasonable  time (not to exceed 15 days
from the date of such  purchase)  necessary for the Trust to determine  that the
purchase check will be honored.



<PAGE>


   Exchange Privileges.  The proceeds of a redemption of shares of a fund can be
used to purchase  shares of another fund. The proceeds of a redemption of shares
from a fund can also be used to purchase  shares of The Parnassus  Fund, but the
purchase of Parnassus  Fund shares will be subject to a sales charge if no sales
charge was paid on the fund shares  redeemed.  If shares are  redeemed  from The
Parnassus Fund and the proceeds  invested in shares of the Trust,  there will be
no  additional  sales charge if those Trust shares are redeemed and the proceeds
invested back into The Parnassus Fund.

   There is no limit on the  number or dollar  amount  of  exchanges.  The Trust
reserves the right to modify or eliminate this exchange privilege in the future.
The  exchange  privilege  is only  available in states where the exchange may be
legally  made.  The  exchange  of shares is treated as a sale and an  exchanging
shareholder may, therefore, realize a taxable gain or loss.

   Telephone  Transfers.  Shareholders  who  elect  to  use  telephone  transfer
privileges  must so indicate  on the account  application  form.  The  telephone
transfer  privilege allows a shareholder to effect exchanges from a fund into an
identically  registered  account in another fund or The Parnassus Fund.  Neither
the Trust nor Parnassus  Investments  will be liable for following  instructions
communicated  by  telephone  reasonably  believed to be  genuine;  a loss to the
shareholder  may result due to an  unauthorized  transaction.  The Trust and the
transfer agent will employ  reasonable  pro-cedures to confirm that instructions
communicated by telephone are genuine.

   Procedures may include one or more of the following:  recording all telephone
calls requesting telephone exchanges, verifying authorization and requiring some
form of personal  identification prior to acting upon instructions and sending a
statement  each time a  telephone  exchange  is made.  The  Trust and  Parnassus
Investments  may be liable  for any  losses due to  unauthorized  or  fraudulent
instructions  only if such  reasonable  procedures are not followed.  Of course,
shareholders are not obligated in any way to authorize  telephone  transfers and
may choose to make all exchanges in writing.  The telephone  exchange  privilege
may be modified or  discontinued  by the Trust at any time upon 60 days' written
notice to shareholders.

   Redemption  of Small  Accounts.  The  Trustees  may,  in order to reduce  the
expenses of the Trust, redeem all of the shares of any shareholder whose account
is worth less than $500 (as a result of a redemption  order).  This will be done
at the NAV  determined as of the close of business on the business day preceding
the sending of such notice of redemption. The Trust will give shareholders whose
shares are being  redeemed  60 days' prior  written  notice in which to purchase
sufficient shares to avoid such redemption.


<PAGE>

DIVIDENDS AND TAXES
- --------------------------------------------------------------------------------
   The  Equity  Income  Fund  normally  declares  and  pays  dividends  from net
investment  income ("income  dividends") on a quarterly  basis. The Fixed-Income
Fund  and the  California  Tax-Exempt  Fund  normally  declare  and  pay  income
dividends  on a  monthly  basis.  Dividends  from net  long-term  capital  gains
("capital gains  dividends") are paid once a year (usually in December) for each
Fund.  Shareholders can have dividends paid in additional  shares and reinvested
or paid out in cash.  If an investor  purchases  shares just before the dividend
date, he or she will be taxed on the  distribution  even though it's a return of
capital.


Taxation of Shareholders in Equity Income and Fixed-Income Funds

   For the Equity Income Fund and the Fixed-Income  Fund, all dividends from net
investment  income  together  with  distributions  of  short-term  capital gains
(collectively,  "income  dividends")  will be  taxable  as  ordinary  income  to
shareholders  even though paid in additional  shares.  Any net long-term capital
gains ("capital gain distributions")  distributed to shareholders are taxable as
such to shareholders.  An exchange of a fund's shares for shares of another fund
will be treated as a sale of a fund's  shares for tax  purposes  and any gain on
the transaction  may be subject to state and federal income tax.  Tax-exempt and
tax-deferred  shareholders,  of course, will not be required to pay taxes on any
dividends  paid to them.  Holders  of IRAs  and  other  tax-deferred  retirement
accounts  are  not  required  to  pay  taxes  until  distribution.   (Tax-exempt
retirement accounts, of course, never have to pay taxes.)

   For shareholders of these funds,  the Trust may  be required to impose backup
withholding  at a rate  of  31%  from  any  income  dividend  and  capital  gain
distribution.  Shareholders can eliminate any backup withholding requirements by
furnishing  certification of U.S. taxpayer  identification numbers and reporting
dividends.

   To the extent that income  dividends  are derived from  qualifying  dividends
paid by domestic  corporations whose shares are owned by a fund, such dividends,
in the hands of that fund's corporate shareholders, will be eligible for the 70%
dividends received deduction.  Individuals  do not  qualify for this deduction--
only corporations.


Taxation of Shareholders of California Tax-Exempt Fund

   This Fund is for California  residents only.  Dividends derived from interest
on state and local obligations constitute  "exempt-interest"  dividends on which
shareholders  are not  subject to federal  income tax. To the extent that income
dividends are derived from earnings  attributable to California  state and local
obligations,  they will be exempt from federal and  California  personal  income
tax. Such dividends may be subject to California  franchise  taxes and corporate
income taxes if received by a corporation subject to such taxes.

   Dividends  attributable to interest on certain private  activity bonds issued
after August 7, 1986,  must be included in federal  alternative  minimum taxable
income for the purpose of  determining  liability  (if any) for the  alternative
minimum tax (AMT) for individuals and for corporations.

   Dividends  derived from taxable interest and any  distributions of short-term
capital gains are taxable to shareholders as ordinary  income.  Distributions of
net long-term  capital gains, if any, are taxable to shareholders as a long-term
capital  gain  regardless  of how long  their  shares of the Fund have been held
except that  losses on certain  shares held less than six months will be treated
as long-term capital losses to the extent of the capital gain dividends received
on such shares.

   The  Fund  will  notify  shareholders  each  January  as to the  federal  and
California tax status of dividends paid during the previous calendar year.




<PAGE>



FINANCIAL  HIGHLIGHTS
- --------------------------------------------------------------------------------
   The financial highlights table is intended to help you understand each fund's
financial  performance  for the past five years.  Certain  information  reflects
financial  results  for a single  fund  share.  The total  returns  in the table
represent the rate that an investor would have earned on an investment in a fund
assuming  reinvestment of all dividends and distributions.  This information has
been audited by Deloitte & Touche LLP,  independent  accountants,  whose report,
along with the Trust's financial  statements,  is included in the Trust's annual
report. A free copy of the annual report is available upon request.


<TABLE>
<CAPTION>

- ----------------------------------------------------------------------------------------------------------
Equity Income Fund                                     1998       1997       1996        1995         1994
- ----------------------------------------------------------------------------------------------------------
<S>                                                  <C>        <C>        <C>         <C>          <C>   
Net asset value at beginning of year                 $20.68     $18.56     $19.58      $15.70       $17.46
Income from investment operations:
Net investment income                                  0.75       0.79       0.98        0.88        0.80
Net realized and unrealized gain (loss) on securities  1.49       2.86       0.37        3.93       (1.75)
     Total from investment operations                  2.24       3.65       1.35        4.81       (0.95)
Distributions:
Dividends from net investment income                  (0.73)     (0.79)     (0.97)      (0.90)      (0.81)
Distributions from net realized gains                 (2.06)     (0.74)     (1.40)      (0.03)        .--
     Total distributions                              (2.79)     (1.53)     (2.37)      (0.93)      (0.81)
Net asset value at end of year                       $20.13     $20.68     $18.56      $19.58      $15.70
Total return                                          11.05%     20.15%      7.09%      31.13%     (5.39%)
Ratios/supplemental data:
Ratio of expenses to average net assets (actual)*      1.05%      1.05%      0.80%       0.72%       0.83%
Decrease reflected in the above expense ratios due to
     undertakings by Parnassus Investments             0.24%      0.30%      0.60%       0.82%       0.88%
Ratio of net investment income to average net assets   2.30%      4.04%      4.56%       4.76%       5.15%
Portfolio turnover rate                              166.32%     34.12%     47.80%      15.36%       6.50%
Net assets, end of year (000's)                     $ 40,903   $38,847   $ 33,362    $ 26,779    $ 17,087

- -----------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>

<TABLE>
<CAPTION>

Fixed-Income Fund                                      1998       1997       1996        1995         1994
- -----------------------------------------------------------------------------------------------------------
<S>                                                  <C>        <C>        <C>         <C>         <C>   
Net asset value at beginning of year                 $16.04     $15.43     $15.73      $13.79      $15.89
Income from investment operations:
Net investment income                                  0.84       0.90       0.92        0.95        1.02
Net realized and unrealized gain (loss) on securities  0.25       0.67      (0.31)       1.95       (2.08)
     Total from investment operations                  1.09       1.57       0.61        2.90       (1.06)
Distributions:
Dividends from net investment income                  (0.85)     (0.89)     (0.91)      (0.96)      (1.04)
Distributions from net realized gains                 (0.30)     (0.07)        .--         .--         .--
     Total distributions                              (1.15)     (0.96)     (0.91)      (0.96)      (1.04)
Net asset value at end of year                       $15.98     $16.04     $15.43      $15.73      $13.79
Total return                                           6.97%     10.60%      4.08%      21.58%     (6.76%)
Ratios/supplemental data:
Ratio of expenses to average net assets (actual)*      0.79%      0.82%      0.83%       0.90%       0.81%
Decrease reflected in the above expense ratios due to
     undertakings by Parnassus Investments             0.40%      0.43%      0.50%       0.73%       0.98%
Ratio of net investment income to average net assets   4.92%      5.79%      5.98%       6.20%       7.00%
Portfolio turnover rate                               44.98%     17.15%      2.80%      12.10%       5.20%
Net assets, end of year (000's)                    $ 11,482    $ 9,683   $  8,384    $  6,585    $  4,545
</TABLE>

<TABLE>
<CAPTION>

- ------------------------------------------------------------------------------------------------------------
California Tax-Exempt Fund                             1998       1997       1996        1995         1994
- ------------------------------------------------------------------------------------------------------------
<S>                                                  <C>        <C>        <C>         <C>         <C>   
Net asset value at beginning of year                 $16.72     $16.02     $16.06      $14.28      $16.10
Income from investment operations:
Net investment income                                  0.75       0.74       0.80        0.82        0.80
Net realized and unrealized gain (loss) on securities  0.26       0.71      (0.06)       1.78       (1.81)
     Total from investment operations                  1.01       1.45       0.74        2.60       (1.01)
Distributions:
Dividends from net investment income                  (0.75)     (0.75)     (0.78)      (0.82)      (0.81)
Distributions from net realized gains                 (0.10)        .--        .--         .--         .--
     Total distributions                              (0.85)     (0.75)     (0.78)      (0.82)      (0.81)
Net asset value at end of year                       $16.88     $16.72     $16.02      $16.06      $14.28
     Total return                                      6.12%      9.33%      4.78%      18.60%     (6.36%)
Ratios/supplemental data:
Ratio of expenses to average net assets (actual)*      0.67%      0.67%      0.54%       0.50%       0.39%
Decrease reflected in the above expense ratios due to
undertakings by Parnassus Investments                  0.30%      0.32%      0.46%       0.69%       0.87%
Ratio of net investment income to average net assets   4.43%      4.69%      4.96%       5.30%       5.37%
Portfolio turnover rate                                9.40%     10.00%       .--%      13.10%      12.00%
Net assets, end of year (000's)                    $  7,342    $ 6,520   $  5,835    $  4,483    $  3,902

<FN>

* Parnassus  Investments  has agreed to a 1.25% limit on expenses for the Equity
Income Fund and 1% for the  Fixed-Income  and California  Tax-Exempt  Funds (See
Note 5 for details).  Certain fees were waived for the years ended  December 31,
1998, 1997, 1996, 1995 and 1994.
</FN>
</TABLE>


<PAGE>

GENERAL INFORMATION
- --------------------------------------------------------------------------------
   Deloitte & Touche LLP, 50 Fremont Street,  San Francisco,  CA 94105, has been
selected as the Trust's independent auditors.

   Union Bank of California,  475 Sansome Street,  San Francisco,  CA 94111, has
been selected as the custodian of the Trust's assets.

   Parnassus  Investments,   One  Market-Steuart  Tower  #1600,  San  Francisco,
California 94105, is the Trust's transfer agent and accounting agent.  Jerome L.
Dodson, the Trust's President, is the sole stockholder of Parnassus Investments.

   One  issue  with  the  potential  to  disrupt  fund   operations  and  affect
performance  is the  inability of some  computers  to  recognize  the year 2000.
Parnassus Investments has taken steps to enable its systems to handle this issue
and has scheduled final testing for its internal systems for the middle of 1999.
The investment  adviser is also seeking  confirmation from its service providers
and business  partners that they are taking  similar steps.  These  providers of
external  systems  have  indicated  they are  working on this issue and they are
scheduled  to  complete  testing  in the first  half of 1999.  The Trust is also
collecting  information  on Year  2000  issues  with  regard to the  issuers  of
securities in the portfolios of the funds and deciding what investment action to
take in light of the  findings.  Nevertheless,  there can be no  assurance  that
these steps will be sufficient to avoid any adverse impact upon the Trust.





<PAGE>


                               INVESTMENT ADVISER

                              Parnassus Investments

                         One Market-Steuart Tower #1600

                         San Francisco, California 94105

                                www.parnassus.com



                              INDEPENDENT AUDITORS

                              Deloitte & Touche LLP

                                50 Fremont Street

                         San Francisco, California 94105



                                    CUSTODIAN

                            Union Bank of California

                               475 Sansome Street

                         San Francisco, California 94111



                   You can obtain additional information about
                           The Parnassus Income Trust.
                   A Statement of Additional Information (SAl)
                      dated May 1, 1999 has been filed with
                 the SEC and is incorporated in this prospectus
                 by reference (i.e., legally forms a part of the
             prospectus). The Trust also publishes an annual and a
              semiannual report each year that discuss the Trust's
              holdings and how recent market conditions as well as
             the Trust's investment strategies affected performance.
               For a free copy of any of these documents or to ask
              questions about the Trust, call Parnassus Investments
                               at (800) 999-3505.

                   The SAl, the Trust's annual and semiannual
             reports and other related materials are also available
              on the SEC's Internet site (http://www.sec.gov). You
                   can also obtain copies of this information
                  upon paying a duplicating fee, by writing the
                      Public Reference Section of the SEC,
                          Washington, D.C. 20549-6009.
                    You can also review and copy information
                     about the Trust, including the SAl, at
                       the SEC's Public Reference Room in
               Washington, D.C. Call 800-SEC-0330 for information
                            on the operation of the
                   SEC's Public Reference Room. The Investment
                       Company Act of 1940 File Number for
                     The Parnassus Income Trust is 811-6673.



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