USAA MUTUAL FUND INC
N-30D, 2000-03-24
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Table of Contents

      USAA Family of Funds                                       1
      Message from the President                                 2
      Investment Review                                          4
      Message from the Manager                                   5
      Shareholder Voting Results                                 8
      Financial Information
         Portfolio of Investments                                9
         Notes to Portfolio of Investments                      12
         Statement of Assets and Liabilities                    13
         Statement of Operations                                14
         Statements of Changes in Net Assets                    15
         Notes to Financial Statements                          16












Important Information

Through  our  ongoing  efforts to reduce  expenses  and  respond to  shareholder
requests,  your annual and semiannual report mailings are streamlined.  One copy
of each report is sent to each address,  rather than to every registered  owner.
For many  shareholders  and their families,  this eliminates  duplicate  copies,
saving paper and postage costs to the Fund.

If you are the  primary  shareholder  on at least  one  account,  prefer  not to
participate in streamlining, and would like to continue receiving one report per
registered account owner, you may request this in writing to:

    USAA Investment Management Company
    Attn: Report Mail
    9800 Fredericksburg Road
    San Antonio, TX 78284-8916

or phone a mutual fund representative at 1-800-531-8448 during business hours.

This  report is for the  information  of the  shareholders  and  others who have
received a copy of the currently  effective  prospectus of the USAA Income Fund,
managed by USAA Investment  Management  Company (IMCO).  It may be used as sales
literature only when preceded or accompanied by a current prospectus which gives
further details about the Fund.

USAA   with  the  eagle  is   registered   in  the  U.S.   Patent  &   Trademark
Office.(Copyright)2000, USAA. All rights reserved.













                      USAA Family of Funds Summary


         Fund                                             Minimum
       Type/Name                     Volatility          Investment
       ---------                     ----------          ----------
 CAPITAL APPRECIATION
===============================================================================
 Aggressive Growth                 Very high               $3,000
 Emerging Markets                  Very high               $3,000
 First Start Growth(Registered
  Trademark)                       Moderate to high        $3,000
 Gold                              Very high               $3,000
 Growth                            Moderate to high        $3,000
 Growth & Income                   Moderate                $3,000
 International                     Moderate to high        $3,000
 S&P 500 (Registered Trademark)
  Index                            Moderate                $3,000
 Science & Technology              Very high               $3,000
 Small Cap Stock                   Very high               $3,000
 World Growth                      Moderate to high        $3,000

 ASSET ALLOCATION
===============================================================================
 Balanced Strategy                 Moderate                $3,000
 Cornerstone Strategy              Moderate                $3,000
 Growth and Tax
  Strategy                         Moderate                $3,000
 Growth Strategy                   Moderate to high        $3,000
 Income Strategy                   Low to moderate         $3,000

 INCOME - TAXABLE
===============================================================================
 GNMA(Registered Trademark) Trust  Low to moderate         $3,000
 High-Yield
  Opportunities                    High                    $3,000
 Income                            Moderate                $3,000
 Income Stock                      Moderate                $3,000
 Intermediate-Term
  Bond                             Low to moderate         $3,000
 Short-Term Bond                   Low                     $3,000

 INCOME - TAX EXEMPT
===============================================================================
 Long-Term                         Moderate                $3,000
 Intermediate-Term                 Low to moderate         $3,000
 Short-Term                        Low                     $3,000
 State Bond Income                 Moderate                $3,000

 MONEY MARKET
===============================================================================
 Money Market                      Very low                $3,000
 Tax Exempt
  Money Market                     Very low                $3,000
 Treasury Money
  Market Trust (Registered
  Trademark)                       Very low                $3,000
 State Money Market                Very low                $3,000
- -------------------------------------------------------------------------------


Foreign  investing is subject to  additional  risks,  which are discussed in the
funds' prospectuses.

S&P 500(Registered  Trademark)is a trademark of The McGraw-Hill Companies,  Inc.
and has been licensed for use. The product is not  sponsored,  sold, or promoted
by Standard & Poor's,  and Standard & Poor's makes no  representation  regarding
the advisability of investing in the product.

Some income may be subject to state or local  taxes or the  federal  alternative
minimum tax.

An investment in a money market fund is not insured or guaranteed by the FDIC or
any other  government  agency.  Although the fund seeks to preserve the value of
your  investment  at $1 per share,  it is possible to lose money by investing in
the fund.

The Science & Technology Fund may be more volatile than a fund that  diversifies
across many industries.

The  InveStart(Registered  Trademark) program is available for investors without
the $3,000 initial  investment  required to open an IMCO mutual fund account.  A
mutual fund  account can be opened  with no initial  investment  if you elect to
have  monthly  automatic  investments  of at  least  $50  from a  bank  account.
InveStart is not  available on tax-exempt  funds or the S&P 500 Index Fund.  The
minimum  initial  investment  for IRAs is $250,  except for the  $2,000  minimum
required  for the S&P 500 Index  Fund.  IRAs are not  available  for  tax-exempt
funds.  The Growth and Tax Strategy Fund is not  available as an investment  for
your IRA because the majority of its income is tax exempt.

California,  Florida, New York, Texas, and Virginia funds available to residents
only.

Nondeposit  investment products are not insured by the FDIC, are not deposits or
other  obligations  of, or guaranteed by, USAA Federal Savings Bank, are subject
to investment risks, and may lose value.

For more complete  information about the mutual funds managed and distributed by
USAA Investment  Management  Company,  including charges and operating expenses,
please  call  1-800-531-8181  for a  prospectus.  Read it  carefully  before you
invest.











Message from the President


[PHOTOGRAPH OF PRESIDENT AND VICE CHAIRMAN OF THE BOARD, MICHAEL J.C. ROTH, CFA,
 APPEARS HERE.]


What an exciting time this is!

The way we do business,  the way we communicate with each other, the way we live
our  lives is all  changing  with  breathtaking  speed.  It is  fascinating  and
sometimes scary. And it creates new investment ideas every day.

As we begin 2000, a  challenging  investment  picture is out there.  In the last
half of 1999, especially, investors in growth or technology stocks had wonderful
returns.  These came on the heels of four  previous  years of returns  that were
well above  average.  Those  returns in 1999 were the  product of the actions of
investors who think on the leading edge: technology,  Internet, electronics. For
investors who included bonds or value-based stocks in their portfolios, 1999 was
disappointing.  The returns  there were largely  driven by the Federal  Reserve,
which is much more concerned with inflation than with leading-edge  thinking.  I
do not mean that as a put-down; that's just how it is.

And one last piece of the puzzle:  the returns for growth and technology  stocks
are coupled with price/earnings ratios that are so far above any common standard
that people are only guessing at what they mean.

So, in a nutshell,  1999 was huge returns on growth and tech stocks coupled with
valuations that were  stratospheric  and paltry returns on everything else. And,
oh yes, the economy continues to grow in a way that has some economists  talking
about eliminating the national debt in just over a decade.

Great  opportunities  coupled with very interesting  risks is a picture that for
many of you will continue to argue for the approach we have counseled.  Create a
portfolio that pursues your goals within a level of risk which you can tolerate.

That  portfolio can be much more exciting than it was a few years ago. We'd love
to help you create it.


Sincerely,


Michael J.C. Roth, CFA
President and
Vice Chairman of the Board



Past performance is no guarantee of future results.











Investment Review


USAA INCOME FUND

OBJECTIVE: Maximum current income without undue risk to principal.

TYPES OF INVESTMENTS: Invests principally in income-producing securities.



- --------------------------------------------------------------------------------
                                           7/31/99                1/31/00
================================================================================
  Net Assets                           $1,415.4 Million       $1,275.8 Million
  Net Asset Value Per Share                 $11.70                 $11.25
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
Average Annual Total Returns as of 1/31/00
================================================================================
      7/31/99 to 1/31/00        1 Year           5 Years         10 Years
            -0.43%(+)           -4.35%            7.27%            8.01%
- --------------------------------------------------------------------------------

(+) Total  returns  for periods of less than one year are not  annualized.  This
    six-month return is cumulative.

Total  return   equals   income  yield  plus  share  price  change  and  assumes
reinvestment of all dividends and capital gains distributions. No adjustment has
been made for taxes payable by shareholders on their reinvested income dividends
and capital gains  distributions.  The  performance  data quoted  represent past
performance and are not an indication of future results.  Investment  return and
principal value of an investment will fluctuate,  and an investor's shares, when
redeemed, may be worth more or less than their original cost.



                        CUMULATIVE PERFORMANCE COMPARISON

A chart in the form of a line graph appears here, illustrating the comparison of
a $10,000  hypothetical  investment in the USAA Income Fund, the Lehman Brothers
Aggregate  Bond Index,  and the Lipper  Corporate  Debt A Rated  Average for the
period of  01/31/90  through  01/31/2000.  The data points from the graph are as
follows:

               USAA Income            Lehman Brothers         Lipper Corp. Debt
                  Fund             Aggregate Bond Index        A Rated Average
              -------------        --------------------       -----------------

01/31/90         $10,000                  $10,000                   $10,000
07/31/90          10,472                   10,551                    10,479
01/31/91          11,005                   11,163                    10,947
07/31/91          11,760                   11,680                    11,495
01/31/92          12,764                   12,618                    12,500
07/31/92          13,739                   13,406                    13,367
01/31/93          14,428                   14,002                    13,955
07/31/93          15,386                   14,769                    14,881
01/31/94          15,662                   15,282                    15,455
07/31/94          14,866                   14,783                    14,725
01/31/95          15,203                   14,928                    14,796
07/31/95          16,597                   16,277                    16,168
01/31/96          18,432                   17,458                    17,417
07/31/96          17,556                   17,179                    16,939
01/31/97          18,638                   18,027                    17,785
07/31/97          19,689                   19,028                    18,827
01/31/98          20,905                   19,960                    19,682
07/31/98          21,602                   20,525                    20,185
01/31/99          22,579                   21,572                    21,041
07/31/99          21,689                   21,036                    20,271
01/31/00          21,596                   21,174                    20,257

Data from 1/31/90 through 1/31/00


The graph illustrates the comparison of a $10,000 hypothetical investment in the
USAA Income Fund to the broad-based Lehman Brothers Aggregate Bond Index and the
Lipper Corporate Debt A Rated Average.  The Lehman Brothers Aggregate Bond Index
is  an  unmanaged  index  made  up  of  the   government/corporate   index,  the
mortgage-backed  securities  index, and the asset-backed  securities  index. The
Lipper  Corporate Debt A Rated Average is the average  performance  level of all
corporate debt funds A rated, as reported by Lipper Analytical  Services,  Inc.,
an independent organization that monitors the performance of mutual funds.












Message from the Manager



[PHOTOGRAPH OF PORTFOLIO MANAGER:  JOHN W. SAUNDERS, JR., CFA, APPEARS HERE.]


For most of 1999,  interest  rates moved up,  causing  bond  prices,  which move
inversely  with  interest  rates,  to fall.  The  year  began  with the  world's
financial  systems  recovering  from the Russian debt crisis  during the fall of
1998.  In reaction to this  crisis,  the Federal  Reserve (the Fed) had acted to
restore  liquidity into the financial  system by easing  interest rates. As 1999
began,  this action had restored  confidence to the financial  markets and paved
the way for strong  economic  growth.  However,  strong growth  throughout  1999
renewed  inflation  fears, and the Fed was forced to take back its 1998 easings.
It increased  interest  rates by 0.75% in three  one-quarter  point moves in the
second  half of 1999,  and by another  0.25% in early  February  2000.  Although
inflation for the year, as measured by the Consumer  Price Index,  was only 1.9%
- -- the  slowest in 34 years -- sharply  higher  energy  prices and a tight labor
market served to heighten inflation fears. During the last six-month period, the
yield on the 30-year  Treasury  bond has moved from 6.11% on July 30,  1999,  to
6.49% on January 31,  2000,  while the yield on the 10-year  Treasury  has moved
from 5.90% to 6.67% in the same period.


                         30-YEAR U.S. TREASURY BOND YIELD

A chart in the form of a line graph appears here,  illustrating  the performance
of  a  30-year  U.S.  Treasury  Bond  Yield  for  the  period  07/31/99  through
01/31/2000. The data points from the graph are as follows:

07/31/99          6.11%
08/16/99          6.09%
08/31/99          6.07%
09/15/99          6.11%
09/30/99          6.06%
10/15/99          6.27%
10/29/99          6.15%
11/15/99          6.04%
11/30/99          6.29%
12/15/99          6.34%
12/31/99          6.48%
01/17/00          6.69%
01/31/00          6.49%


In this rising interest rate environment, the USAA Income Fund underperformed in
its peer group because of the portfolio's  longer average  maturity.  The Fund's
high  income  orientation  tends to keep  average  maturity  longer.  The Fund's
average annual total return for the past six months was -0.43% versus an average
of -0.07% for all funds in the Lipper Corporate Debt Fund A Rated Category.  The
distribution  yield was very  attractive at 6.71% versus an average of 6.03% for
its Lipper category.

PORTFOLIO

As of January 31, 2000,  the Fund's  portfolio mix as  percentages of net assets
was 10.8% U.S. Treasury bonds,  62.1% agency mortgage  pass-through  securities,
16.9% corporate bonds, and 9.5% preferred stocks.

OUTLOOK

The bond market continues to be unsettled.  Most market observers expect the Fed
to continue  raising  interest rates until the pace of economic  growth slows. A
slowing economy tends to set the stage for rising bond prices. In addition,  the
federal  budget surplus and the  Department of the  Treasury's  announcement  of
plans to reduce the federal  debt by buying back  Treasury  securities  create a
demand  for the  remaining  Treasury  securities.  This  gives us  reason  to be
cautiously optimistic about the course of long-term interest rates over the next
six months.



Respectfully submitted on February 4, 2000.




- --------------------------------------------------------------------------------
On January 31, 2000, John W. (Jack) Saunders, Jr., portfolio manager of the USAA
Income Fund since  1985,  retired  from USAA.  Jack,  a 34-year  veteran of USAA
Investment Management Company, was a significant force behind the development of
the Company. He will be sorely missed by all!

With 20 years industry  experience,  Didi Weinblatt has been hand-picked to take
over as the portfolio manager of your Fund. Didi has an impressive background as
both an analyst and portfolio manager.  We are confident in Didi's abilities and
know that she will strive to deliver the same commitment you expect from USAA.






                              Top 10 Securities
                              (% of Net Assets)
      -----------------------------------------------------------------
                                    Coupon Rate %       % Of Net Assets
                                    -------------       ---------------
      GNMA                              7.50                  23.5
      GNMA                              6.00                  13.1
      U.S. Treasury Bond                5.25                  10.8
      GNMA                              7.00                   9.2
      FNMA                              7.50                   6.6
      GNMA                              6.50                   6.4
      FNMA                              7.00                   3.3
      AT&T Capital Corp., MTN           7.50                   1.6
      Household Finance Corp., Notes    7.25                   1.5
      Merrill Lynch & Co.,
       MTN, Series B                    6.00                   1.5
      -----------------------------------------------------------------


See page 9 for a complete listing of the portfolio of investments.














Shareholder Voting Results

On October 15, 1999, a special meeting of  shareholders  was held to vote on the
following  proposals.  All  proposals  were  approved by the  shareholders.  All
shareholders  of  record on  August  19,  1999,  were  entitled  to vote on each
proposal.  The number of votes shown below are for the entire series of the USAA
Mutual Fund, Inc. (the Company) for proposals 1 and 2.

1  Proposal to elect Directors as follows:

     DIRECTORS                    VOTES FOR             VOTES WITHHELD

     Robert G. Davis             1,769,441,834            27,742,867
     Michael J.C. Roth           1,769,442,078            27,742,623
     Barbara B. Dreeben          1,769,442,172            27,742,529
     Robert L. Mason             1,769,442,172            27,742,529
     David G. Peebles            1,769,442,078            27,742,623
     Michael F. Reimherr         1,769,441,328            27,743,373
     Richard A. Zucker           1,769,444,074            27,740,627

John W. Saunders,  Jr. and Howard L. Freeman,  Jr. did not stand for re-election
to the Board. Their term of office terminated on December 31, 1999.

2  Proposal  to ratify the  selection  by the Board of  Directors of KPMG LLP as
auditors for the Company.


                            NUMBER OF SHARES VOTING
- --------------------------------------------------------------------------------

            FOR                     AGAINST                  ABSTAIN

       1,664,427,712               19,027,937                27,873,822













<TABLE>

USAA INCOME FUND
PORTFOLIO OF INVESTMENTS

January 31, 2000
(Unaudited)

<CAPTION>


                                                                                    Market
  Number                                                                             Value
of Shares                        Security                                            (000)
- ------------------------------------------------------------------------------------------
 <C>        <S>                                                                   <C>
                             PREFERRED STOCKS (9.5%)

   57,846   Archstone Communities Trust depositary shares "B",
              9.00% cumulative redeemable                                         $  1,287
  483,800   Avalon Bay Communities, Inc., "C", 8.50% cumulative redeemable          10,341
  421,240   Avalon Bay Communities, Inc., "D", 8.00% cumulative redeemable           8,293
  103,107   Avalon Bay Communities, Inc., "F", 9.00% cumulative redeemable           2,211
  444,526   Avalon Bay Communities, Inc., "G", 8.96% cumulative redeemable           9,502
  211,268   Duke Realty Investments, Inc. depositary shares "A",
              9.10% cumulative redeemable                                            4,806
  332,655   Equity Office Properties Trust depositary shares "A",
              8.98% cumulative redeemable                                            7,651
   40,000   Equity Residential Properties Trust depositary shares "B",
              9.125% cumulative redeemable                                             900
  575,000   Equity Residential Properties Trust depositary shares "C",
              9.125% cumulative redeemable                                          12,974
  142,500   Equity Residential Properties Trust depositary shares "F",
              8.29% cumulative redeemable                                            6,368
  115,300   Equity Residential Properties Trust depositary shares "F",
              9.65% cumulative redeemable                                            2,666
  452,600   First Industrial Realty Trust, Inc. depositary shares "B",
              8.75% cumulative redeemable                                            9,335
  412,000   Gables Residential Trust "A", 8.30% cumulative redeemable                7,674
  250,000   Post Properties, Inc. "A", 8.50% cumulative redeemable                  10,125
   46,060   Prologis Trust, Inc. "A", 9.40% cumulative redeemable                    1,039
  338,500   Prologis Trust, Inc. "C", 8.54% cumulative redeemable                   14,323
  200,000   Shurgard Storage Centers, Inc. "B", 8.80% cumulative redeemable          3,950
   46,075   United Dominion Realty Trust, Inc. depositary shares "A",
              9.25% cumulative redeemable                                              947
  400,000   United Dominion Realty Trust, Inc. depositary shares "B",
              8.60% cumulative redeemable                                            7,600
- ------------------------------------------------------------------------------------------
            Total preferred stocks (cost: $146,902)                                121,992
- ------------------------------------------------------------------------------------------


  Principal
   Amount                                                     Coupon
   (000)                       Security                        Rate     Maturity
- ------------------------------------------------------------------------------------------

                        CORPORATE OBLIGATIONS (16.9%)

 $  8,000   Associates Corp. of North America, Senior Notes    6.25%   11/01/2008    7,194
   20,000   AT&T Capital Corp., MTN                            7.50    11/15/2000   20,081
   20,000   BankBoston N.A., MTN                               6.38     4/15/2008   18,312
    5,000   Caliber Systems, Inc., Notes                       7.80     8/01/2006    4,834
   10,000   Chase Manhattan Corp., Subordinated Notes          6.13    10/15/2008    8,919
   15,000   Chase Manhattan Corp., Subordinated Notes          7.13     2/01/2007   14,414
    4,900   Consolidated Rail Corp., Debentures                9.75     6/15/2020    5,647
   20,000   Cummins Engine Co., Inc., MTN, Series A            6.45     3/01/2005   18,508
   10,000   Finova Capital Corp., MTN                          6.00     1/07/2004    9,457
   15,000   First Union Corp., Subordinated Notes              7.50     7/15/2006   14,700
   20,000   Household Finance Corp., Notes                     7.25     5/15/2006   19,423
   10,000   MBNA Corp., Subordinated Notes                     6.75     3/15/2008    9,237
   20,000   Merrill Lynch & Co., MTN, Series B                 6.00    10/11/2005   18,553
   10,000   Province of Quebec, Debentures                     6.50     1/17/2006    9,464
   15,000   Province of Quebec, Global Debentures              7.00     1/30/2007   14,493
   15,000   Waste Management, Inc., Notes                      7.00    10/15/2006   13,372
    9,000   Wells Fargo & Co., Subordinated Notes              6.88     4/01/2006    8,595
- ------------------------------------------------------------------------------------------
            Total corporate obligations (cost: $223,973)                           215,203
- ------------------------------------------------------------------------------------------


                      U.S. GOVERNMENT & AGENCY ISSUES (72.9%)

            Federal National Mortgage Assn. (9.9%)
   43,460   7.00%, 9/01/2022 - 9/01/2023                                            41,736
   86,120   7.50%, 2/01/2022 - 2/01/2023                                            84,307
- ------------------------------------------------------------------------------------------
                                                                                   126,043
- ------------------------------------------------------------------------------------------

            Government National Mortgage Assn. (52.2%)
  186,913   6.00%, 7/15/2028 - 10/15/2028                                          167,665
   88,153   6.50%, 6/15/2023 - 5/15/2028                                            82,062
  122,321   7.00%, 5/15/2023 - 7/15/2029                                           116,976
  305,508   7.50%, 9/15/2022 - 8/15/2029                                           299,278
- ------------------------------------------------------------------------------------------
                                                                                   665,981
- ------------------------------------------------------------------------------------------

            U.S. Treasury Bonds (10.8%)
  165,281   5.25%, 11/15/2028                                                      137,596
- ------------------------------------------------------------------------------------------
            Total U.S. government & agency issues (cost: $996,712)                 929,620
- ------------------------------------------------------------------------------------------


                                SHORT-TERM (.01%)

            Commercial Paper
      100   General Electric Capital Corp., 5.81%, 2/01/2000
             (cost: $100)                                                              100
- ------------------------------------------------------------------------------------------
            Total investments (cost: $1,367,687)                                $1,266,915
==========================================================================================

</TABLE>



                          PORTFOLIO SUMMARY BY INDUSTRY
                          -----------------------------
            U.S. Government                                     72.9%
            Real Estate Investment Trusts                        9.6
            Banks - Money Center                                 3.0
            Banks - Major Regional                               2.8
            Finance - Diversified                                2.3
            Finance - Consumer                                   2.1
            Foreign Government                                   1.9
            Investment Banks/Brokerage                           1.5
            Heavy Duty Trucks & Parts                            1.4
            Waste Management                                     1.0
            Railroads/Shipping                                    .4
            Truckers                                              .4
                                                                ----
            Total                                               99.3%
                                                                ====













USAA INCOME FUND
NOTES TO PORTFOLIO OF INVESTMENTS

January 31, 2000
(Unaudited)



GENERAL NOTES

Market values of securities are determined by procedures and practices discussed
in note 1 to the financial statements.

The cost of securities for federal income tax purposes is approximately the same
as that reported in the financial statements.

The percentages shown represent the percentage of the investments to net assets.


PORTFOLIO DESCRIPTION ABBREVIATION

     MTN   Medium-Term Note



See accompanying notes to financial statements.










<TABLE>

USAA INCOME FUND
STATEMENT OF ASSETS AND LIABILITIES
(IN THOUSANDS)

January 31, 2000
(Unaudited)

<S>                                                                                 <C>
ASSETS
   Investments in securities, at market value (identified cost of $1,367,687)       $1,266,915
   Cash                                                                                    234
   Receivables:
      Capital shares sold                                                                  107
      Dividends and interest                                                            10,953
                                                                                    ----------
         Total assets                                                                1,278,209
                                                                                    ----------

LIABILITIES
   Capital shares redeemed                                                               1,931
   USAA Investment Management Company                                                      264
   USAA Transfer Agency Company                                                            138
   Accounts payable and accrued expenses                                                    43
                                                                                    ----------
         Total liabilities                                                               2,376
                                                                                    ----------
            Net assets applicable to capital shares outstanding                     $1,275,833
                                                                                    ==========

REPRESENTED BY:
   Paid-in capital                                                                  $1,386,490
   Accumulated undistributed net investment income                                       2,387
   Accumulated net realized loss on investments                                        (12,272)
   Net unrealized depreciation of investments                                         (100,772)
                                                                                    ----------
            Net assets applicable to capital shares outstanding                     $1,275,833
                                                                                    ==========
   Capital shares outstanding                                                          113,391
                                                                                    ==========
   Authorized shares of $.01 par value                                                 270,000
                                                                                    ==========
   Net asset value, redemption price, and offering price per share                  $    11.25
                                                                                    ==========


See accompanying notes to financial statements.

</TABLE>













USAA INCOME FUND
STATEMENT OF OPERATIONS
(IN THOUSANDS)

Six-month period ended January 31, 2000
(Unaudited)




Net investment income:
   Income:
      Dividends                                                  $  6,298
      Interest                                                     43,265
                                                                 --------
         Total income                                              49,563
                                                                 --------
   Expenses:
      Management fees                                               1,659
      Transfer agent's fees                                           931
      Custodian's fees                                                100
      Postage                                                          64
      Shareholder reporting fees                                       13
      Directors' fees                                                   1
      Registration fees                                                37
      Professional fees                                                17
      Other                                                             8
                                                                 --------
         Total expenses                                             2,830
                                                                 --------
            Net investment income                                  46,733
                                                                 --------
Net realized and unrealized loss on investments:
   Net realized loss                                              (11,299)
   Change in net unrealized appreciation/depreciation             (41,327)
                                                                 --------
            Net realized and unrealized loss                      (52,626)
                                                                 --------
Decrease in net assets resulting from operations                 $ (5,893)
                                                                 ========



See accompanying notes to financial statements.













USAA INCOME FUND
STATEMENTS OF CHANGES IN NET ASSETS
(IN THOUSANDS)

Six-month period ended January 31, 2000,
and year ended July 31, 1999
(Unaudited)




                                                         1/31/00       7/31/99
                                                       -------------------------

From operations:
   Net investment income                               $   46,733   $   105,582
   Net realized gain (loss) on investments                (11,299)       45,287
   Change in net unrealized appreciation/depreciation
      of investments                                      (41,327)     (133,924)
                                                       ------------------------
      Increase (decrease) in net assets
         resulting from operations                         (5,893)       16,945
                                                       ------------------------
Distributions to shareholders from:
   Net investment income                                  (44,341)     (106,248)
                                                       ------------------------
   Net realized gains                                      (3,306)      (63,044)
                                                       ------------------------
From capital share transactions:
   Proceeds from shares sold                               90,579       283,608
   Shares issued for dividends reinvested                  37,783       141,194
   Cost of shares redeemed                               (214,386)     (608,632)
                                                       ------------------------
      Decrease in net assets from
         capital share transactions                       (86,024)     (183,830)
                                                       ------------------------
Net decrease in net assets                               (139,564)     (336,177)
Net assets:
   Beginning of period                                  1,415,397     1,751,574
                                                       ------------------------
   End of period                                       $1,275,833    $1,415,397
                                                       ========================
Undistributed (overdistributed) net investment
   income included in net assets:
   End of period                                       $    2,387    $       (4)
                                                       ========================
Change in shares outstanding:
   Shares sold                                              7,817        22,816
   Shares issued for dividends reinvested                   3,286        11,266
   Shares redeemed                                        (18,660)      (49,127)
                                                       ------------------------
      Decrease in shares outstanding                       (7,557)      (15,045)
                                                       ========================


See accompanying notes to financial statements.












USAA INCOME FUND
NOTES TO FINANCIAL STATEMENTS

January 31, 2000
(Unaudited)



(1) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

USAA MUTUAL FUND, INC. (the Company),  registered  under the Investment  Company
Act of 1940,  as  amended,  is a  diversified,  open-end  management  investment
company incorporated under the laws of Maryland consisting of 13 separate funds.
The information  presented in this  semiannual  report pertains only to the USAA
Income Fund (the  Fund).  The Fund's  investment  objective  is maximum  current
income without undue risk to principal.  USAA Investment Management Company (the
Manager)  seeks to  achieve  this  objective  by  investing  the  Fund's  assets
principally in income-producing securities.

A.  Security  valuation - The value of each  security is  determined  (as of the
close of  trading  on the New  York  Stock  Exchange  on each  business  day the
Exchange is open) as set forth below:

1.  Debt and government  securities  are valued each  business  day by a pricing
service (the  Service)  approved by the Fund's Board of  Directors.  The Service
uses the mean  between  quoted  bid and asked  prices or the last sale  price to
price  securities  when,  in the Service's  judgement,  these prices are readily
available and are  representative  of the  securities'  market values.  For many
securities,  such prices are not readily available. The Service generally prices
these  securities  based on methods  which  include  consideration  of yields or
prices  of  securities  of  comparable  quality,   coupon,  maturity  and  type,
indications  as to  values  from  dealers  in  securities,  and  general  market
conditions.

2.  Portfolio  securities,  except as  otherwise  noted,  traded  primarily on a
domestic  securities  exchange  are  valued  at the  last  sales  price  on that
exchange.

3.  Over-the-counter  securities  are priced at the last sales  price or, if not
available, at the average of the bid and asked prices.

4.  Securities  purchased  with  maturities  of 60 days or less  are  stated  at
amortized cost, which approximates market value.

5.  Securities  that cannot be valued by the methods  set forth  above,  and all
other assets,  are valued in good faith at fair value,  using methods determined
by the Manager under the general supervision of the Board of Directors.

B.  Federal taxes - The Fund's policy is to comply with the  requirements of the
Internal  Revenue Code  applicable  to  regulated  investment  companies  and to
distribute  substantially all of its income to its shareholders.  Therefore,  no
federal income or excise tax provision is required.

C.  Investments in securities - Security  transactions  are accounted for on the
date the securities are purchased or sold (trade date).  Gain or loss from sales
of investment  securities  is computed on the  identified  cost basis.  Dividend
income is recorded on the ex-dividend  date;  interest income is recorded on the
accrual  basis.  Discounts and premiums on short-term  securities  are amortized
over the life of the respective securities.  Amortization of market discounts on
long-term  securities is recognized as interest  income upon  disposition of the
security to the extent there is a gain on disposition.

D.  Use of estimates - The  preparation  of  financial  statements in conformity
with  generally  accepted  accounting  principles  requires  management  to make
estimates and assumptions  that may affect the reported amounts in the financial
statements.

(2) LINES OF CREDIT

The Fund participates with other USAA funds in three joint short-term  revolving
loan  agreements  totaling  $850  million,  two with  USAA  Capital  Corporation
(CAPCO),  an affiliate of the Manager ($250  million  committed and $500 million
uncommitted), and one with Bank of America ($100 million committed). The purpose
of the  agreements  is to meet  temporary  or  emergency  cash needs,  including
redemption  requests that might  otherwise  require the untimely  disposition of
securities.

Subject to availability  under both  agreements with CAPCO,  the Fund may borrow
from CAPCO an amount up to 5% of the Fund's  total  assets at CAPCO's  borrowing
rate with no markup.  Subject to  availability  under its agreement with Bank of
America,  the  Fund  may  borrow  from  Bank of  America,  at Bank of  America's
borrowing  rate  plus a markup,  an  amount  which,  when  added to  outstanding
borrowings under the CAPCO  agreements,  does not exceed 25% of the Fund's total
assets.  Each  committed line of credit is also subject to a facility fee. CAPCO
charges an annual facility fee of up to .08% of the committed facility, and Bank
of America charges an annual facility fee of .09% of the committed facility. The
Fund had no borrowings under any of these agreements during the six-month period
ended January 31, 2000.

(3) DISTRIBUTIONS

Distributions  of net  investment  income  are made  monthly.  Distributions  of
realized gains from security  transactions not offset by capital losses are made
in the succeeding  fiscal year or as otherwise  required to avoid the payment of
federal taxes.

(4) INVESTMENT TRANSACTIONS

Cost of purchases and proceeds from sales of  securities,  excluding  short-term
securities,  for the six months ending January 31, 2000,  were $20.1 million and
$105.9 million, respectively.

Gross unrealized  appreciation and depreciation of investments as of January 31,
2000, were $1.4 million and $102.2 million, respectively.

(5) TRANSACTIONS WITH MANAGER

A.  Management fees - USAA Investment Management  Company carries out the Fund's
investment policies and manages the Fund's portfolio. The Fund's management fees
are computed at .24% of its annual average net assets.

B.  Transfer agent's fees - USAA Transfer Agency Company, d/b/a USAA Shareholder
Account Services, an affiliate of the Manager,  provides transfer agent services
to the Fund based on an annual  charge of $28.50 per  shareholder  account  plus
out-of-pocket expenses.

C.  Underwriting  services - The Manager  provides  exclusive  underwriting  and
distribution  of the Fund's  shares on a  continuing,  best-efforts  basis.  The
Manager receives no commissions or fees for this service.

D.  Brokerage services - USAA Brokerage Services, a  discount brokerage  service
of the Manager,  may execute  portfolio  transactions for the Fund. The Fund did
not utilize these services during the six-month period ended January 31, 2000.

(6) TRANSACTIONS WITH AFFILIATES

Certain directors and officers of the Fund are also directors,  officers, and/or
employees  of the Manager.  None of the  affiliated  directors or Fund  officers
received compensation from the Fund.

<TABLE>

(7) FINANCIAL HIGHLIGHTS

Per share operating  performance for a share outstanding  throughout each period
is as follows:

<CAPTION>

                             Six-month
                            Period Ended
                             January 31,                    Year Ended July 31,
                           ---------------------------------------------------------------------------------
                               2000          1999          1998          1997          1996          1995
                           ---------------------------------------------------------------------------------
<S>                        <C>           <C>           <C>           <C>           <C>           <C>
Net asset value at
   beginning of period     $    11.70    $    12.88    $    12.54    $    11.97    $    12.11    $    11.67
Net investment income             .40           .80           .85           .83           .83           .84
Net realized and
   unrealized gain (loss)        (.45)         (.72)          .33           .57          (.13)          .45
Distributions from net
   investment income             (.38)         (.80)         (.84)         (.83)         (.84)         (.85)
Distributions of realized
   capital gains                 (.03)         (.46)          -            -             -             -
                           --------------------------------------------------------------------------------
Net asset value at
   end of period           $    11.25    $    11.70    $    12.88    $    12.54    $    11.97    $    12.11
                           ================================================================================
Total return (%) *              -0.43           .40          9.72         12.15          5.78         11.64
Net assets at
   end of
   period (000)            $1,275,833    $1,415,397    $1,751,574    $1,662,981    $1,737,306    $1,755,171
Ratio of expenses to
   average net assets (%)         .41(a)        .38           .38           .39           .40           .41
Ratio of net investment
   income to average net
   assets (%)                    6.78(a)       6.31          6.62          6.76          6.64          7.27
Portfolio turnover (%)           1.49         54.02         47.35(b)      57.50(b)      81.26(b)      30.86(b)

(a) Annualized.  The  ratio  is  not  necessarily  indicative  of  12  months of
    operations.
  * Assumes reinvestment of all dividend  income and capital gains distributions
    during the period.
</TABLE>



(b) Prior to July 31, 1998,  the Fund,  at times,  simultaneously  purchased and
    sold the same securities.  These transactions  sometimes were high in volume
    and were dissimilar  to  other  trade  activity  within  the Fund.  If these
    transactions were excluded from the calculation, the portfolio turnover rate
    would have been as follows:


                             Six-month
                            Period Ended
                             January 31,         Year Ended July 31,
                            ----------------------------------------------------
                              2000   1999    1998     1997      1996      1995
                            ----------------------------------------------------
Portfolio turnover (%)        N/A    N/A     42.11     22.07     44.69      9.09
Purchases and sales of
   this type are as follows:
Purchases (000)               N/A    N/A   $88,811  $593,587  $648,396  $360,943
Sales (000)                   N/A    N/A   $88,915  $594,283  $649,193  $361,366









Directors
Robert G. Davis, Chairman of the Board
Michael J.C. Roth, Vice Chairman of the Board
Barbara B. Dreeben
Robert L. Mason
David G. Peebles
Michael F. Reimherr
Richard A. Zucker

Investment Adviser, Underwriter, and Distributor
USAA Investment Management Company
9800 Fredericksburg Road
San Antonio, Texas 78288

Transfer Agent                           Legal Counsel
USAA Shareholder Account Services        Goodwin, Procter & Hoar LLP
9800 Fredericksburg Road                 Exchange Place
San Antonio, Texas 78288                 Boston, Massachusetts 02109

Custodian                                Independent Auditors
State Street Bank and Trust Company      KPMG LLP
P.O. Box 1713                            112 East Pecan, Suite 2400
Boston, Massachusetts 02105              San Antonio, Texas 78205

Telephone Assistance Hours               Internet Access
Call toll free - Central Time            usaa.com(Service Mark)
Monday - Friday 7:00 a.m. to 9:00 p.m.
Saturdays 8:30 a.m. to 5:00 p.m.
Sundays 11:30 a.m. to 8:00 p.m.

For Additional Information on Mutual Funds
1-800-531-8181, (in San Antonio) 456-7211
For account servicing, exchanges, or redemptions
1-800-531-8448, (in San Antonio) 456-7202

Recorded Mutual Fund Price Quotes
24-hour service (from any phone)
1-800-531-8066, (in San Antonio) 498-8066

Mutual Fund USAA TouchLine(Registered Trademark)
(from touch-tone phones only)
For account balance, last transaction, fund prices,
or to exchange or redeem fund shares
1-800-531-8777, (in San Antonio) 498-8777




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