USAA MUTUAL FUND INC
N-30D, 1999-03-25
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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
  Financial Information:
    Portfolio of Investments                                        8
    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)1999, 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(1)               Very high               $3,000
 First Start Growth                Moderate to high        $3,000
 Gold(1)                           Very high               $3,000
 Growth                            Moderate to high        $3,000
 Growth & Income                   Moderate                $3,000
 International(1)                  Moderate to high        $3,000
 S&P 500 (Registered Trademark)
  Index(2)                         Moderate                $3,000
 Science & Technology(5)           Very high               $3,000
 World Growth(1)                   Moderate to high        $3,000
       
 ASSET ALLOCATION            
===============================================================================
 Balanced Strategy(1)              Moderate                $3,000
 Cornerstone Strategy(1)           Moderate                $3,000
 Growth and Tax
  Strategy(3)                      Moderate                $3,000
 Growth Strategy(1)                Moderate to high        $3,000
 Income Strategy                   Low to moderate         $3,000
          
 INCOME - TAXABLE         
===============================================================================
 GNMA                              Low to moderate         $3,000
 Income                            Moderate                $3,000
 Income Stock                      Moderate                $3,000
 Short-Term Bond                   Low                     $3,000
              
 INCOME - TAX EXEMPT        
===============================================================================
 Long-Term(3)                      Moderate                $3,000
 Intermediate-Term(3)              Low to moderate         $3,000
 Short-Term(3)                     Low                     $3,000
 State Bond Income(3)**            Moderate                $3,000
       
 MONEY MARKET        
===============================================================================
 Money Market(4)                   Very low                $3,000
 Tax Exempt
  Money Market(3),(4)              Very low                $3,000
 Treasury Money
  Market Trust(4)                  Very low                $3,000
 State Money Market(3),(4)**       Very low                $3,000

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

(2)  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.

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

(4)  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.

(5)  This 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.  

Non-deposit investment products are not insured by the FDIC, are not deposits or
other  obligations  of, or guaranteed  by, USAA Federal  Savings  Bank,  and 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]


The last half of 1998 was a fascinating time in the financial markets. While the
press,  as usual,  devoted most of its  attention to stock  markets,  the income
markets were perhaps even more interesting.

The turmoil in foreign debt markets coupled with the problems of a notable hedge
fund, set off an almost incredible wave of events. I use the word "wave" because
it so well describes the reaction that occurred in the U.S. Treasury  securities
market. We see this in the chronology of yields on the 30-year Treasury bond:

                 U.S. Treasury               30-year Yield
                 -----------------------------------------
                 August 3, 1998                   5.66%
                 September 1, 1998                5.34%
                 October 1, 1998                  4.88%
                 November 2, 1998                 5.24%
                 December 1, 1998                 5.03%


And, as this is being written in early March 1999, the 30-year bond has returned
to the level of August 1998.

These seemingly dry numbers tell a story that is filled with terror.  This was a
flight to quality and a flight away from  anything that smacked of risk. It is a
reminder  that  mutual  funds  are not  bank  accounts.  They  are  conduits  to
securities  markets,  and those markets must function every day. If the world is
in turmoil,  that  functioning will be rocky, but that does not mean all is bad.
If you owned  Russian  or  Brazilian  bonds it was bad.  But if you  owned  U.S.
Treasuries it was absolutely wonderful.

That is the great lesson here. A tumultuous  market produces  winners as well as
losers because money must flow somewhere. That's one reason we diversify. That's
one reason we don't pay much attention to doomsayers.


Sincerely,


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

For more complete  information about the mutual funds managed and distributed by
USAA Investment  Management  Company,  including charges and operating expenses,
please call for a prospectus. Read it carefully before investing.

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:  Primarily income-producing  securities selected for their
high yields relative to the risk involved.


- --------------------------------------------------------------------------------
                                            7/31/98             1/31/99
================================================================================
  Net Assets                           $1,751.6 Million     $1,733.3 Million
  Net Asset Value Per Share                 $12.88               $12.57
- --------------------------------------------------------------------------------



- --------------------------------------------------------------------------------
AVERAGE ANNUAL TOTAL RETURNS AS OF 1/31/99
================================================================================
  7/31/98 to 1/31/99          1 Year           5 Years          10 Years
        4.52%(+)               8.01%            7.59%             9.80%
- --------------------------------------------------------------------------------

(+)  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 gain distributions.  No adjustment has
been made for taxes payable by shareholders on their reinvested income dividends
and capital gain  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  01/31/89  through  01/31/99.  The data  points  from the graph are as
follows:

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

01/89            $10,000                   $10,000                    $10,000
07/89             11,092                    10,993                     10,888
01/90             11,274                    11,156                     10,940
07/90             11,806                    11,771                     11,465
01/91             12,407                    12,454                     11,976
07/91             13,258                    13,030                     12,580
01/92             14,390                    14,077                     13,686
07/92             15,489                    14,956                     14,639
01/93             16,266                    15,621                     15,288
07/93             17,346                    16,477                     16,308
01/94             17,657                    17,049                     16,938
07/94             16,760                    16,492                     16,128
01/95             17,140                    16,654                     16,206
07/95             18,711                    18,159                     17,725
01/96             20,781                    19,476                     19,117
07/96             19,792                    19,165                     18,636
01/97             21,012                    20,112                     19,582
07/97             22,197                    21,228                     20,736
01/98             23,569                    22,268                     21,684
07/98             24,354                    22,898                     22,258
01/99             25,464                    24,067                     23,174

Data from 1/31/89 through 1/31/99

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

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

MARKET CONDITIONS AND PERFORMANCE
The high volatility in the bond market during this reporting  period can be seen
in the chart  below  showing  interest  yields  for the  30-year  U.S.  Treasury
bond.(1)



                         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 07/31/98 through 01/31/99.
The data points from the graph are as follows:

07/31/98          5.71%
08/17/98          5.60%
08/31/98          5.35%
09/15/98          5.35%
09/30/98          5.12%
10/05/98          4.85%
10/15/98          5.12%
10/30/98          5.27%
11/16/98          5.42%
11/30/98          5.25%
12/15/98          5.26%
12/31/98          5.31%
01/15/99          5.33%
01/29/99          5.27%



Beginning with the Russian  government bond default in mid-August,  a "flight to
quality"  started a strong rally in U. S. Treasury bonds moving  interest yields
lower.  This  rally  accelerated  when  some  highly  leveraged  hedge  funds(2)
collapsed.  The result was unsustainably lower interest yields on U. S. Treasury
bonds while  liquidity in the rest of the bond market  vanished when its dealers
refused to bid for bonds.  This lack of liquidity  caused  interest rates in the
rest of the bond market to move sharply  higher.  A rally in the Japanese yen in
October  caused several hedge funds to sell U.S.  Treasury  bonds  reversing the
diverging  trend  and  forcing  Treasury  bond  yields  higher.  As the dust has
settled,  interest  rates  are lower on  balance  but not as low as they were in
early October. Average maturities in the Fund's bond portfolio were shortened to
reduce price volatility in this turbulent  period.  For the 1-year period ending
January 31, 1999,  your Fund ranked 27 out of 154 funds in the Lipper  Corporate
Debt A Rated Bond Fund category in which the Fund's performance  is measured.(3)
The average return for all funds in the category was 6.92%.

(1)  The 30-year U.S.  Treasury bond is generally  considered  the benchmark for
     U.S.  long-term  interest  rates. 

(2)  A private investment pool for wealthy investors that, unlike a mutual fund,
     is exempt from SEC regulation.

(3)  For the 5- and 10- year periods  ending January 31, 1999, the Fund ranked 6
     out of 81 and 3 out of 42 funds in the  Corporate  Debt-A  Rated  Bond Fund
     category respectively. Fund rankings awarded by Lipper Analytical Services,
     Inc., are based on total returns.



PORTFOLIO
As of January 31, 1999,  the Fund's  portfolio mix as  percentages of net assets
was 5.2% U.S.  Treasury bonds, 8.1% U.S.  Government Agency bonds,  50.1% agency
mortgage  pass-through  securities,  27.3% corporate  bonds,  and 8.4% preferred
stocks.

OUTLOOK
The Federal  Reserve has overtly  announced an "easing" in monetary  policy with
its three  reductions since late September in both the Fed Funds target rate and
its own discount  window rate. We would not expect any  additional  easing for a
while because the economy is continuing to do quite well.  The first quarter for
1999 is showing similar strength to that seen in the past three years.  Interest
rates have  stabilized in a trading  range of 5% to 5.4% on the current  30-year
U.S.  Treasury bond. This relative  stability  should continue through the first
quarter.  We continue to focus on maintaining a high level of income in the Fund
to enhance the compounding of potential returns that accrue through reinvestment
of income.  These compounding returns have the greatest impact in a tax-deferred
retirement  account such as an IRA. Over half of the Income Fund's  accounts are
retirement accounts.

Past performance is no guarantee of future results.




  ------------------------------------------------------------
                        TOP 10 SECURITIES
                        (% OF NET ASSETS)
  ------------------------------------------------------------

                          Coupon Rate %     % Of Net Assets
                          -------------     ---------------
  Federal Home Loan Bank      5.575              5.9
  U.S. Treasury Bond          7.875              5.2
  GNMA                        6.00               5.2
  GNMA                        7.50               2.2
  FNMA MTN                    5.65               2.2
  GNMA                        7.50               2.0
  GNMA                        6.50               1.9          
  GNMA                        6.00               1.9
  GNMA                        7.50               1.8
  GNMA                        7.50               1.5
  ------------------------------------------------------------

  See page 8 for a complete listing of the Portfolio of Investments.



<TABLE>

USAA INCOME FUND
PORTFOLIO OF INVESTMENTS

January 31, 1999
(Unaudited)

<CAPTION>


                                                                                Market
  Number                                                                         Value
of Shares                         Security                                       (000)
- -----------------------------------------------------------------------------------------
 <C>       <S>                                                                <C>
                             PREFERRED STOCKS (8.4%)
  57,846   Archstone Communities Trust depositary shares "B",
              9.00% cumulative redeemable                                     $    1,475
 483,800   Avalon Bay Communities, Inc., "C", 8.50% cumulative redeemable         11,944
 421,240   Avalon Bay Communities, Inc., "D", 8.00% cumulative redeemable         10,347
 103,107   Avalon Bay Communities, Inc., "F", 9.00% cumulative redeemable          2,603
 444,526   Avalon Bay Communities, Inc., "G", 8.96% cumulative redeemable         11,335
 211,268   Duke Realty Investments, Inc. depositary shares "A",
              9.10% cumulative redeemable                                          5,651
 332,655   Equity Office Properties Trust depositary shares "A",
              8.98% cumulative redeemable                                          8,379
  40,000   Equity Residential Properties Trust depositary shares "B",
              9.125% cumulative redeemable                                         1,040
 575,000   Equity Residential Properties Trust depositary shares "C", 
              9.125% cumulative redeemable                                        15,058
 142,500   Equity Residential Properties Trust depositary shares "F",
              8.29% cumulative redeemable                                          7,267
 115,300   Equity Residential Properties Trust depositary shares "F",
              9.65% cumulative redeemable                                          2,991
 452,600   First Industrial Realty Trust, Inc. depositary shares "B",
              8.75% cumulative redeemable                                         10,636
 412,000   Gables Residential Trust "A", 8.30% cumulative redeemable               9,965
 250,000   Post Properties, Inc. "A", 8.50% cumulative redeemable                 12,969
  46,060   Prologis Trust, Inc. "A", 9.40% cumulative redeemable                   1,163 
 338,500   Prologis Trust, Inc. "C", 8.54% cumulative redeemable                  16,586
 200,000   Shurgard Storage Centers, Inc. "B", 8.80% cumulative redeemable         5,213 
  46,075   United Dominion Realty Trust, Inc. depositary shares "A",  
              9.25% cumulative redeemable                                          1,129
 400,000   United Dominion Realty Trust, Inc. depositary shares "B",
              8.60% cumulative redeemable                                         10,400
- ----------------------------------------------------------------------------------------
            Total preferred stocks (cost: $146,902)                              146,151
- ----------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>



                          CORPORATE OBLIGATIONS (27.3%)

  Principal                                                                              Market
   Amount                                                   Coupon                       Value
    (000)                   Security                         Rate         Maturity       (000)
- -----------------------------------------------------------------------------------------------
<C>        <S>                                                <C>         <C>            <C>
$  9,000   Aluminum Co. of America, Notes                     5.75%        2/01/2001      9,104
   1,500   American General Finance Corp., Senior Notes       5.88         7/01/2000      1,510
  15,000   American General Finance Corp., Senior Notes       5.88         7/15/2001     15,165
  10,000   Associates Corp. of North America, Senior Notes    5.90         6/23/2000     10,074
   8,000   Associates Corp. of North America, Senior Notes    6.25        11/01/2008      8,342
  20,000   AT&T Capital Corp., MTN                            7.50        11/15/2000     20,392
  15,000   Avco Financial Services, Inc., Senior Notes        6.00         8/15/2002     15,245
  20,000   BankBoston N.A., MTN                               6.38         4/15/2008     20,184
   5,000   Caliber Systems, Inc., Notes                       7.80         8/01/2006      5,362
  10,000   Caterpillar Financial Services Corp., 
            MTN, Series F                                     5.83        10/16/2000     10,047
  10,000   Chase Manhattan Corp., Subordinated Notes          6.13        10/15/2008     10,281
  15,000   Chase Manhattan Corp., Subordinated Notes          7.13         2/01/2007     16,313
  14,000   Chrysler Financial Corp., MTN                      6.05         3/06/2001     14,151
  10,000   Comdisco, Inc., MTN, Series G                      6.02         6/26/2000      9,983
   4,900   Consolidated Rail Corp., Debentures                9.75         6/15/2020      6,526
  20,000   Cummins Engine Co., Inc., MTN, Series A            6.45         3/01/2005     19,592
  10,000   Finova Capital Corp., MTN                          6.00         1/07/2004     10,021
  15,000   First Union Corp., Subordinated Notes              7.50         7/15/2006     16,667
  15,000   Ford Motor Credit Co.                              6.25        11/08/2000     15,204
   4,875   Ford Motor Credit Co., MTN                         5.99         2/27/2001      4,932 
  10,000   General Electric Capital Corp., MTN, Series A      5.72         7/16/2001     10,104
  10,000   General Electric Credit Corp., MTN                 5.73         6/19/2000     10,065
  11,560   General Motors Acceptance Corp., MTN               5.95         4/20/2001     11,681
  15,000   Heller Financial, Inc., MTN                        5.93         7/24/2000     14,999
  20,000   Household Finance Corp., Notes                     7.25         5/15/2006     21,723
  20,000   IBM, Corp., MTN                                    5.76         7/10/2000     20,190
  15,000   John Deere Capital Corp., MTN                      5.75         7/13/2000     15,007
  10,000   MBNA Corp.                                         6.75         3/15/2008     10,032
  10,000   Mellon Financial Co., Senior Notes                 6.30         6/01/2000     10,122
  20,000   Merrill Lynch & Co., MTN, Series B                 6.00        10/11/2005     20,197
  10,000   Nationsbank Charlotte NC, N.A., Notes              5.86         5/26/2000     10,043
   5,000   Newell Co., MTN                                    6.18         7/11/2000      5,053
   6,500   Provident Bank, Bank Notes                         6.13        12/15/2000      6,559
  10,000   Province of Quebec, Debentures                     6.50         1/17/2006     10,501
  15,000   Province of Quebec, Global Debentures              7.00         1/30/2007     16,302
  15,000   Waste Management, Inc., Notes                      7.00        10/15/2006     15,862
  15,000   Weingarten Realty Investors, MTN, Series A         6.00         8/10/2001     14,942
   9,000   Wells Fargo & Co., Subordinated Notes              6.88         4/01/2006      9,687
- -----------------------------------------------------------------------------------------------
            Total corporate obligations (cost: $455,832)                                472,164
- -----------------------------------------------------------------------------------------------
</TABLE>



<TABLE>
<CAPTION>

 Principal                                                            Market
  Amount                                                              Value
  (000)                        Security                               (000)
- -------------------------------------------------------------------------------
<C>         <S>                                                     <C> 
                     U.S. GOVERNMENT & AGENCY ISSUES (63.4%)
            Federal Home Loan Bank Bond (5.9%)
$ 101,570   5.575%, 6/22/2000                                       $  102,310
- -------------------------------------------------------------------------------

            Federal National Mortgage Assn. (10.2%)
   54,588   7.00%, 9/01/2022 - 9/01/2023                                55,882
  117,480   7.50%, 2/01/2022 - 2/01/2023                               121,269
- ------------------------------------------------------------------------------
                                                                       177,151
- ------------------------------------------------------------------------------

            Federal National Mortgage Assn., MTN (2.2%)
   37,560   5.65%, 6/12/2000                                            37,863
- ------------------------------------------------------------------------------

            Government National Mortgage Assn. (39.9%)
  194,485   6.00%, 7/15/2028 - 10/15/2028                              193,348
   99,337   6.50%, 6/15/2023 - 5/15/2028                               100,657
   75,750   7.00%, 5/15/2023 - 3/15/2026                                77,866
  308,354   7.50%, 9/15/2022 - 5/15/2027                               319,468
- ------------------------------------------------------------------------------
                                                                       691,339
- ------------------------------------------------------------------------------

            U.S. Treasury Bonds (5.2%)
   68,444   7.875%, 2/15/2021                                           90,539
- ------------------------------------------------------------------------------
            Total U.S. government & agency issues
              (cost: $1,059,753)                                     1,099,202
- ------------------------------------------------------------------------------
            Total investments (cost: $1,662,487)                    $1,717,517
==============================================================================
</TABLE>




                          PORTFOLIO SUMMARY BY INDUSTRY
                          -----------------------------
            U.S. Government                                     63.4%
            Real Estate Investment Trusts                        9.3
            Finance - Consumer                                   5.8
            Finance - Diversified                                4.2
            Banks - Major Regional                               3.3
            Banks - Money Center                                 3.1
            Foreign Government                                   1.5
            Machinery - Diversified                              1.4
            Investment Banks / Brokerage                         1.2
            Computer - Hardware                                  1.2
            Heavy Duty Trucks & Parts                            1.1
            Other                                                3.6
                                                                ----
                                                                99.1%
                                                                ====




USAA INCOME FUND
NOTES TO PORTFOLIO OF INVESTMENTS

January 31, 1999
(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, 1999
(Unaudited)


<S>                                                                                 <C>    
ASSETS
   Investments in securities, at market value (identified cost of $1,662,487)       $1,717,517
   Cash                                                                                    265
   Receivables:
      Capital shares sold                                                                  625
      Dividends and interest                                                            16,023
                                                                                    ----------
         Total assets                                                                1,734,430
                                                                                    ----------
 
LIABILITIES
   Capital shares redeemed                                                                 566
   USAA Investment Management Company                                                      360
   USAA Transfer Agency Company                                                            162
   Accounts payable and accrued expenses                                                    65
                                                                                    ----------
         Total liabilities                                                               1,153
                                                                                    ----------
            Net assets applicable to capital shares outstanding                     $1,733,277
                                                                                    ==========

REPRESENTED BY:
   Paid-in capital                                                                  $1,680,246
   Accumulated undistributed net investment income                                      (1,509)
   Accumulated net realized loss on investments                                           (490)
   Net unrealized appreciation of investments                                           55,030
                                                                                    ----------
            Net assets applicable to capital shares outstanding                     $1,733,277
                                                                                    ==========
   Capital shares outstanding                                                          137,869
                                                                                    ==========
   Authorized shares of $.01 par value                                                 270,000
                                                                                    ==========
   Net asset value, redemption price, and offering price per share                  $    12.57
                                                                                    ==========

See accompanying notes to financial statements.
</TABLE>






USAA INCOME FUND
STATEMENT OF OPERATIONS
(IN THOUSANDS)
Six-month period ended January 31, 1999
(Unaudited)



Net investment income:
   Income:
      Dividends                                                  $      6,298
      Interest                                                         52,951
                                                                 ------------
         Total income                                                  59,249
                                                                 ------------
   Expenses:
      Management fees                                                   2,165
      Transfer agent's fees                                               879
      Custodian's fees                                                    121
      Postage                                                              64
      Shareholder reporting fees                                           27
      Directors' fees                                                       2
      Registration fees                                                    58
      Professional fees                                                    18
      Other                                                                15
                                                                 ------------
         Total expenses                                                 3,349
                                                                 ------------
            Net investment income                                      55,900
                                                                 ------------
Net realized and unrealized gain (loss) on investments:
   Net realized gain                                                   42,464
   Change in net unrealized appreciation/depreciation                 (19,449)
                                                                 ------------
            Net realized and unrealized gain                           23,015
                                                                 ------------
Increase in net assets resulting from operations                 $     78,915
                                                                 ============

See accompanying notes to financial statements.


<TABLE>


USAA INCOME FUND  
STATEMENTS OF CHANGES IN NET ASSETS
(IN  THOUSANDS)  
Six-month period ended January 31, 1999 
and Year ended July 31, 1998
(Unaudited)

<CAPTION>



                                                                    1/31/99        7/31/98
                                                                  -------------------------
<S>                                                               <C>            <C> 
From operations:
   Net investment income                                          $   55,900     $  113,310
   Net realized gain on investments                                   42,464         31,778
   Change in net unrealized appreciation/depreciation of
      investments                                                    (19,449)        14,142
                                                                  -------------------------
      Increase in net assets resulting from operations                78,915        159,230
                                                                  -------------------------
Distributions to shareholders from:
   Net investment income                                             (58,072)      (112,714)
                                                                  -------------------------
   Net realized gains                                                (63,044)           - 
                                                                  -------------------------
From capital share transactions:
   Proceeds from shares sold                                         134,365        192,405
   Shares issued for dividends reinvested                            102,962         91,639
   Cost of shares redeemed                                          (213,423)      (241,967)
                                                                  -------------------------
      Increase in net assets from capital share
         transactions                                                 23,904         42,077
                                                                  -------------------------
Net increase (decrease) in net assets                                (18,297)        88,593
Net assets:
   Beginning of period                                             1,751,574      1,662,981
                                                                  -------------------------
   End of period                                                  $1,733,277    $ 1,751,574
                                                                  =========================
Undistributed net investment income included in net assets:
   End of period                                                  $   (1,509)   $       663
                                                                  =========================
Change in shares outstanding:
   Shares sold                                                        10,464         15,116
   Shares issued for dividends reinvested                              8,102          7,216
   Shares redeemed                                                   (16,690)       (18,992)
                                                                  -------------------------
      Increase in shares outstanding                                   1,876          3,340
                                                                  =========================

See accompanying notes to financial statements.

</TABLE>




USAA INCOME FUND
NOTES TO FINANCIAL STATEMENTS

January 31, 1999
(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 ten  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
primarily in securities that have high yields relative to the risk involved.

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  which 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 NationsBank of Texas, N.A. ($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 the CAPCO agreements,
the Fund may borrow from CAPCO an amount under both agreements combined of up to
5% of the Fund's total assets at CAPCO's borrowing rate with no markup.  Subject
to availability  under its agreement with NationsBank,  the Fund may borrow from
NationsBank  an amount which,  when added to  outstanding  borrowings  under the
CAPCO   agreements,   does  not  exceed  25%  of  the  Fund's  total  assets  at
NationsBank's borrowing rate plus a markup. The Fund had no borrowings under any
of these agreements during the six-month period ended January 31, 1999.

(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-month period ended January 31, 1999 were $382.0 million
and $421.5 million, respectively.

Gross unrealized  appreciation and depreciation of investments as of January 31,
1999 was $60.2 million and $5.2 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.

(6) TRANSACTIONS WITH AFFILIATES
USAA Investment Management Company is indirectly wholly owned by United Services
Automobile  Association  (the  Association),   a  large,  diversified  financial
services  institution.  At January 31, 1999, the  Association and its affiliates
(including  related employee benefit plans) owned 17.4 million shares (12.6%) of
the Fund.

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.

(7) YEAR 2000
Like other mutual  funds,  the Fund could be adversely  affected if the computer
systems used by the Manager and the Fund's other service  providers are not able
to perform  their  intended  functions  effectively  after  1999  because of the
inability of computer  software to distinguish the year 2000 from the year 1900.
The Manager is taking  steps to address  this  potential  year 2000 problem with
respect  to the  computer  systems  that  they  use and to  obtain  satisfactory
assurances  that  comparable  steps are being  taken by the Fund's  other  major
service providers.  At this time, however,  there can be no assurance that these
steps  will be  sufficient  to avoid  any  adverse  impact to the Fund from this
problem.

<TABLE>

(8) FINANCIAL HIGHLIGHTS
Per share operating  performance for a share outstanding  throughout each period
is as follows:

<CAPTION>


                                 Six-month                                                                     Ten-month
                                Period Ended                                                                 Period Ended
                                January 31,                         Year Ended July 31,                         July 31,
                               ------------------------------------------------------------------------------------------
                                  1999             1998            1997             1996         1995             1994
                               ------------------------------------------------------------------------------------------
<S>                            <C>             <C>             <C>             <C>             <C>             <C>
Net asset value at
   beginning of period         $    12.88      $    12.54      $    11.97      $    12.11      $    11.67      $    13.28
Net investment income                 .41             .85             .83             .83             .84             .72
Net realized and
   unrealized gain (loss)             .16             .33             .57            (.13)            .45           (1.30)
Distributions from net
   investment income                 (.42)           (.84)           (.83)           (.84)           (.85)           (.78)
Distributions of realized 
   capital gains                     (.46)            -               -               -               -              (.25)
                               ------------------------------------------------------------------------------------------
Net asset value at
   end of period               $    12.57      $    12.88      $    12.54      $    11.97      $    12.11      $    11.67
                               ==========================================================================================
Total return (%)*                    4.52            9.72           12.15            5.78           11.64           (4.52)
Net assets at
   end of period (000)         $1,733,277      $1,751,574      $1,662,981      $1,737,306      $1,755,171      $1,718,934
Ratio of expenses to
   average net assets (%)             .37(a)          .38             .39             .40             .41             .41(a)
Ratio of net investment
   income to average net
   assets (%)                        6.20(a)         6.62          6.76              6.64            7.27            6.98(a)
Portfolio turnover (%)              21.76           47.35(b)      57.50(b)          81.26(b)        30.86b          25.36(b)

  * Assumes reinvestment of all dividend income and capital gain distributions
    during the period.
(a) Annualized. The ratio is not necessarily indicative of 12 months of 
    operations.
(b) At times,  before the current period, the Fund has  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:

</TABLE>

<TABLE>
<CAPTION>



                              Six-month                                                       Ten-month
                             Period Ended                                                   Period Ended
                              January 31,                Year Ended July 31,                   July 31,
                             ---------------------------------------------------------------------------
                                 1999        1998        1997          1996         1995         1994
                             ---------------------------------------------------------------------------
<S>                               <S>     <C>           <C>          <C>          <C>          <C>    
Portfolio turnover (%)            NA         42.11         22.07        44.69         9.09        16.79
Purchases and sales of
   this type are as follows:
Purchases (000)                   NA      $ 88,811      $593,587     $648,396     $360,943     $155,322
Sales (000)                       NA      $ 88,915      $594,283     $649,193     $361,366     $155,497

</TABLE>



DIRECTORS
Robert G. Davis, Chairman of the Board
Michael J.C. Roth, President and Vice Chairman of the Board
John W. Saunders, Jr., Vice President
Barbara B. Dreeben
Howard L. Freeman, Jr.
Robert L. Mason
Richard A. Zucker

INVESTMENT ADVISER, UNDERWRITER AND DISTRIBUTOR
USAA Investment Management Company
9800 Fredericksburg Road
San Antonio, Texas 78288

TRANSFER AGENT
USAA Shareholder Account Services
9800 Fredericksburg Road
San Antonio, Texas 78288

CUSTODIAN
State Street Bank and Trust Company
P.O. Box 1713
Boston, Massachusetts 02105

LEGAL COUNSEL
Goodwin, Procter & Hoar LLP
Exchange Place
Boston, Massachusetts 02109

INDEPENDENT AUDITORS
KPMG Peat Marwick LLP
112 East Pecan, Suite 2400
San Antonio, Texas 78205

Telephone Assistance Hours
Call toll free - Central Time
Monday - Friday 7:30 a.m. to 8:00 p.m.
Saturdays 8:30 a.m. to 5:00 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(Service Trademark)
(from Touchtone phones only)
For account balance, last transaction or fund prices
1-800-531-8777, (in San Antonio) 498-8777




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