USAA MUTUAL FUND INC
N-30D, 1998-03-25
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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:
         Statement of Assets and Liabilities                            8
         Portfolio of Investments in Securities                         9
         Notes to Portfolio of Investments in Securities               12
         Statement of Operations                                       13
         Statements of Changes in Net Assets                           14
         Notes to Financial Statements                                 15



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 Stock
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)1998, 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 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 neither  insured nor  guaranteed by
     the U.S.  government,  and there is no assurance that any of the funds will
     be able to maintain a stable net asset value of $1 per share.
(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 offered by USAA Investment  Management Company
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 IMCO,  including  charges and expenses,  please call  1-800-531-8181  for a
prospectus. Read it carefully before you invest.




Message from the President


"We are now ready to move to another  plateau."

Back in 1980  we began  to craft a  family of  mutual funds  that would allow an
investor to create a diversified  portfolio  suited to an  individual's appetite
for risk.  In  1984 we  started  a  brokerage  service  because  we thought some
members might want that.  The two have grown beyond our dreams.  Our fund family
now offers 35  investment  choices  and our  Brokerage Service has become a very
significant  presence  in  its  industry.  We are  now ready  to move to another
plateau.

As I write  this  message,  the USAA  Investment  Management  Company  is in the
process  of  ending  our  long  and  mutually  rewarding  relationship  with BHC
Securities, and taking on all of the responsibilities of  running  our Brokerage
Service.  The term for this is "self-clearing."  It includes our own seat on the
Chicago Stock Exchange.  Shortly after we achieve self-clearing,  we  shall also
move  our mutual fund accounts off of an internal system and onto the facilities
of DST Systems, a  Kansas  City company  that processes  very much of the mutual
fund industry's  transactions.  These two moves will greatly improve our ability
to offer you better service.

Our goal is to give you a single  investment  account which can hold,  track and
report to you on almost any type of  investment  you wish to make. It will offer
features such as low-cost loans based upon your investments,(1) easy movement of
funds,(2) and a single statement.  It  will  also be tied to other USAA services
such as banking, fixed and variable annuities and property and casualty and life
insurance.  We will make this the only investment  account you will need. You'll
be hearing more on this in coming months.

Sincerely,

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


[Photograph of the President and Vice Chairman of the Board, Michael J. C. Roth,
appears here.]


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

USAA Brokerage  Services is a discount  brokerage service of USAA IMCO, a member
of the NASD.

(1) Margin borrowing allows you to buy securities  using funds that we will loan
you for payment.  It can serve as a low-interest  loan which can be used for any
purpose. Not all securities can be margined,  however. Margin borrowing involves
additional risks.

(2) An investor should consider the fluctuating values of securities.




Investment Review

INCOME STOCK FUND

OBJECTIVE:  Current income with the prospect of increasing dividend  income  and
the potential for capital appreciation.

TYPES OF INVESTMENTS:  Common  stocks  of well-established, large companies with
above-average dividend yields.

================================================================================
                                             7/31/97                 1/31/98
  Net Assets                            $2,186.3 Million        $2,373.7 Million
  Net Asset Value Per Share                  $19.01                  $19.23
================================================================================
Average Annual Total Returns As Of 1/31/98
     7/31/97 to 1/31/98          1 Year           5 Years          10 Years
           8.88%+                21.61%           15.89%            14.83%
================================================================================

+ 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 Stock Fund to the S&P 500
Index and the Lipper  Mixed  Equity - Income  Funds  Average  from  01/31/88  to
01/31/98. The data points from the graph are as follows:

                                                       LIPPER MIXED
          USAA INCOME            S&P 500              EQUITY - INCOME
           STOCK FUND             INDEX                FUNDS AVERAGE
          ----------             --------              -------------

01/31/88    10,000                10,000                 10,000
06/88       10,509                10,815                 10,814
12/88       10,971                11,186                 11,253
06/89       12,528                13,034                 12,791
12/89       13,948                14,724                 13,650
06/90       13,552                15,178                 13,522
12/90       13,750                14,267                 12,519
06/91       15,111                16,297                 14,132
12/91       17,507                18,604                 15,841
06/92       17,898                18,479                 16,206
12/92       18,872                20,019                 17,368
06/93       20,485                20,993                 18,785
12/93       21,052                22,032                 19,914
06/94       20,214                21,287                 19,273
12/94       20,904                22,322                 19,528
06/95       24,158                26,828                 22,570
12/95       26,887                30,700                 25,353
06/96       28,802                33,797                 27,227
12/96       31,916                37,744                 30,035
06/97       34,785                45,518                 34,380
12/97       40,530                50,332                 37,860
01/31/98    39,866                50,888                 37,867



The graph illustrates the comparison of a $10,000 hypothetical investment in the
USAA Income Stock Fund to the S&P 500 Index and the Lipper Mixed Equity - Income
Funds  Average,  an  average  performance  level of all mixed  equity and income
funds, as reported by Lipper Analytical  Services,  an independent  organization
that monitors the performance of mutual funds. The S&P 500 Index is an unmanaged
index  representing  the  average  performance  of a group of 500  widely  held,
publicly  traded  stocks.  It is not possible to invest  directly in the S&P 500
Index.



                   Message from the Manager


[Photograph of the Portfolio Manager, Harry W. Miller, CFA, appears here.]


PERFORMANCE

Your Fund's total  return was 8.88% for the six months  ended  January 31, 1998.
This compares to the 3.56% total return for the S&P 500 Index(1) during the same
period. Net assets were $2.37 billion, up from $2.18 billion on July 31, 1997.

Since our last report of July 31,  1997,  the stock  market has had a correction
but has come  back  and is  selling  at a higher  level  than  six  months  ago.
International markets, particularly Asia, took a much harder drop. The portfolio
had no foreign  holdings  but held some  multi-national  securities  during that
period.


New names:
Bell Atlantic (telephone) merged with NYNEX
Boston Properties (REIT)
Equity Office Properties (REIT) merged with Beacon Properties
Fleet Financial Group (banks)
Lyondell Petrochemical (chemicals) from conversion of Atlantic Richfield 
   exchangeable notes
Med Partners, convertible (healthcare)
New Centuries Energy (electric power) merged with Public Service Co. of Colorado
   and Southwestern Public Service and renamed the company
Quantum, convertible (computers-peripherals)


Deleted names:
Chateau Communities and Glimcher Realty (both REITs)
Deluxe Corp. (specialty printing)
James River, convertible (paper & forest products)
MascoTech (auto parts)
NYNEX (telephone) merged into Bell Atlantic
Public Service Co. of Colorado and Southwestern Public Service (both electrical
   power)


(1) The S&P 500 Index is an unmanaged index representing the  performance  of  a
group of  500 widely held, publicly traded stocks.  It is not possible to invest
directly in the S&P 500 Index.


Best Performers:
Ford Motor (autos)
PNC Bank (banking)
Mack California Realty and First Industrial Realty (REIT)
American Home Products and  Bristol-Myers Squibb  (healthcare - diversified)
Unisys, convertible (computer systems)
Continental Airlines, convertible (airlines)
Airtouch Communications, convertible, Bell Atlantic, GTE, Sprint, and US West
   Communications (telephones)
Central Hudson Gas & Electric, Houston Industries, IES Industries, and Texas
   Utilities (electric power)


Worst Performers:
Aetna, convertible (insurance)
Chrysler (autos)
Deere (machinery-diversified)
Philip Morris (tobacco)
Storage USA (REIT)
Texaco (oil)


OUTLOOK AND PERSPECTIVE

The  Fund's  dividend  for 1997  equalled  that of 1996 at $.78 per  share.  Our
ability to maintain,  much less increase,  the Fund's dividend is being affected
by lower interest  rates and yields as well as a trend of companies'  reluctance
to raise their common stock dividends.

The character of the Fund has been  maintained  with a total return of 27% and a
dividend yield of 4% for calendar 1997.(2)

The economy  remains strong with low interest  rates,  low  inflation,  and good
earnings  reports.  Even though the Asian situation casts a shadow over the U.S.
stock market,  we remain optimistic but do not expect the same return in 1998 as
in 1997.

We remain overweighted in automobiles, banks, REITs, healthcare, and telephones.


(2) Past performance is not a guarantee of future  results.  Yields and  returns
    will fluctuate.
The Fund's total returns for the 1-, 5- and 10-year  periods ended  December 31,
1997, were 26.99%, 16.52% and 16.00%, respectively.



============================================
        TOP 10 EQUITY HOLDINGS
          (% OF NET ASSETS)

  Ford Motor                       5.2
  Bristol-Myers Squibb             4.4
  GTE                              4.1
  Bankers Trust New York           3.8
  Bell Atlantic                    3.7
  American Home Products           3.6
  RJR Nabisco                      3.6
  Allegheny Energy                 3.5
  Chrysler                         2.9
  PNC Bank                         2.8
=============================================



=============================================
            TOP 10 INDUSTRIES
            (% OF NET ASSETS)

  Real Estate Investment Trusts    14.5
  Telephones                       10.3
  Electric                         10.2
  Automobiles                       8.1
  Healthcare - Diversified          8.0
  Tobacco                           6.4
  Natural Gas                       5.4
  Banks - Money Center              3.8
  Banks - Major Regional            3.7
  Oil - Domestic Integrated         3.5
=============================================


See page 9 for a complete listing of the Portfolio of Investments in Securities.




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

January 31, 1998
(Unaudited)


ASSETS
   Investments in securities, at market value
      (identified cost of $1,771,854)                               $2,376,999
   Cash                                                                    497
   Receivables:
      Capital shares sold                                                1,561
      Dividends and interest                                             6,672
      Securities sold                                                      522
                                                                    ----------
         Total assets                                                2,386,251
                                                                    ----------


LIABILITIES
   Securities purchased                                                 10,392
   Capital shares redeemed                                                 806
   USAA Investment Management Company                                      998
   USAA Transfer Agency Company                                            229
   Accounts payable and accrued expenses                                   166
                                                                    ----------
         Total liabilities                                              12,591
                                                                    ----------
            Net assets applicable to capital shares outstanding     $2,373,660
                                                                    ==========


REPRESENTED BY:
   Paid-in capital                                                  $1,760,361
   Accumulated undistributed net investment income                       5,196
   Accumulated net realized gain on investments                          2,958
   Net unrealized appreciation of investments                          605,145
                                                                    ----------
            Net assets applicable to capital shares outstanding     $2,373,660
                                                                    ==========
   Capital shares outstanding                                          123,448
                                                                    ==========
   Net asset value, redemption price, and offering price per share  $    19.23
                                                                    ==========

See accompanying notes to financial statements.




INCOME STOCK FUND
PORTFOLIO OF INVESTMENTS IN SECURITIES

January 31, 1998
(Unaudited)


                                    Market
  Number                            Value
of Shares       Security            (000)
- ---------       --------            -----

         COMMON STOCKS (82.5%)
          Automobiles (8.1%)
2,000,000 Chrysler Corp.          $  69,625
2,400,000 Ford Motor Co.            122,400
- -------------------------------------------
                                    192,025
- -------------------------------------------
          Banks - Major Regional (3.7%)
  277,000 Fleet Financial Group,
            Inc.                     19,840
1,300,000 PNC Bank Corp.             67,031
- -------------------------------------------
                                     86,871
- -------------------------------------------
          Banks - Money Center (3.8%)
  875,000 Bankers Trust
            New York Corp.           91,273
- -------------------------------------------
          Chemicals (2.0%)
1,881,760 Lyondell
            Petrochemical Co.        47,985
- -------------------------------------------
          Chemicals - Diversified (1.1%)
  600,000 B.F. Goodrich Co.          25,163
- -------------------------------------------
          Electric (10.2%)
2,700,000 Allegheny Energy, Inc.     82,688
  400,000 Central Hudson
            Gas & Electric Corp.     15,925
1,000,000 Houston Industries, Inc.   26,125
1,100,000 IES Industries, Inc.       40,356
  622,750 New Century Energies,
            Inc.                     28,374
1,200,000 Texas Utilities Co.        49,350
- -------------------------------------------
                                    242,818
- -------------------------------------------
          Healthcare - Diversified (8.0%)
  900,000 American Home
            Products Corp.           85,894
1,050,000 Bristol-Myers Squibb Co.  104,672
- -------------------------------------------
                                    190,566
- -------------------------------------------
          Machinery - Diversified (1.3%)
  600,000 Deere & Co.                31,650
- -------------------------------------------
          Natural Gas (5.4%)
1,383,600 National Fuel Gas Co.      63,645
1,390,500 NICOR, Inc.                55,968
  242,800 Peoples Energy Corp.        9,166
- -------------------------------------------
                                    128,779
- -------------------------------------------
          Oil - Domestic Integrated (3.5%)
  600,000 Atlantic Richfield Co.     44,625
1,500,000 Occidental Petroleum
            Corp.                    38,250
- -------------------------------------------
                                     82,875
- -------------------------------------------
          Oil - International
           Integrated (2.4%)
1,100,000 Texaco, Inc.               57,269
- -------------------------------------------
          Real Estate Investment
           Trusts (14.5%)
  610,000 Arden Realty Group, Inc.   17,233
  400,000 Avalon Properties, Inc.    11,775
  500,000 Boston Properties, Inc.    17,781
  700,000 Brandywine Realty Trust    16,800
  990,000 Burnham Pacific
            Properties, Inc.         14,788
  275,000 Chelsea GCA Realty, Inc.   10,484
  400,000 Developers Diversified
            Realty Corp.             15,875
  395,200 Duke Realty
            Investments, Inc.         9,386
  703,150 Equity Office
            Properties Trust         21,314
  561,000 Felcor Suite Hotels, Inc.  20,932
  600,000 First Industrial
            Realty Trust, Inc.       21,525
  300,000 Gables Residential Trust    8,194
  250,000 Highwoods
            Properties, Inc.          9,047
1,200,000 Liberty Property Trust     32,550
  400,000 Mack California
           Reality Corp.             16,125
  400,000 Mills Corp.                10,250
  510,007 Patriot American
           Hospitality, Inc.         13,069
  350,000 Post Properties, Inc.      13,453
  600,000 Prentiss Properties Trust  16,350
  605,000 Shurgard Storage
            Centers, Inc.            17,280
  400,000 Storage USA, Inc.          15,625
  266,629 United Dominion
            Realty Trust, Inc.        3,700
  325,000 Weeks Corp.                10,136
- -------------------------------------------
                                    343,672
- -------------------------------------------
          Telecommunications -
           Long Distance (1.8%)
  700,000 Sprint Corp.               41,563
- -------------------------------------------
          Telephones (10.3%)
  960,000 Bell Atlantic Corp.        88,860
1,800,000 GTE Corp.                  98,212
1,200,000 US West
            Communications Group     57,750
- -------------------------------------------
                                    244,822
- -------------------------------------------
          Tobacco (6.4%)
1,600,000 Philip Morris
            Companies, Inc.          66,400
2,700,000 RJR Nabisco
            Holdings Corp.           85,050
- -------------------------------------------
                                    151,450
- -------------------------------------------
Total common stocks
  (cost: $1,373,020)              1,958,781
- -------------------------------------------
          PREFERRED STOCKS (13.0%)
          Computer Software
            & Service (2.6%)
1,325,000 Unisys Corp. depositary
            shares "A", $3.75
            cumulative convertible   61,447
- -------------------------------------------
          Healthcare - Specialized
            Services (0.8%)
1,500,000 Medpartners, Inc. 6.50%
            cumulative convertible   20,062
- -------------------------------------------
          Insurance - Life/Health (2.4%)
  750,000 Aetna, Inc., Class C, 6.25%
            cumulative convertible   56,766
- -------------------------------------------
          Iron & Steel (0.5%)
  250,000 USX Corp., 6.50%
            cumulative convertible   12,047
- -------------------------------------------
          Oil & Gas -
            Refining/Manufacturing (2.2%)
1,525,000 Sun Company, Inc.
            depositary shares "A",
            $1.80 cumulative
            convertible              53,184
- -------------------------------------------
          Photography - Imaging (1.1%)
  350,000 IKON Office Solutions, Inc.
            depositary shares "BB",
            6.50% cumulative
            convertible              25,572
- -------------------------------------------
          Publishing/Newspapers (0.5%)
1,000,000 Hollinger International,
            Inc., PRIDES, 9.75%,
            cumulative convertible   12,625
- -------------------------------------------
          Telecommunications -
            Cellular/Wireless (1.6%)
1,000,000 AirTouch Communications,
            Inc., Class B, 6.00%
            cumulative convertible   37,500
- -------------------------------------------
          Waste Management (1.3%)
  950,000 Browning-Ferris
            Industries, Inc., 7.25%
            automatic exchangeable   30,697
- -------------------------------------------

Total preferred stocks
  (cost: $294,002)                  309,900
- -------------------------------------------


Principal                            Market
 Amount                               Value
 (000)           Security             (000)
- ---------        --------             -----
           CONVERTIBLE BONDS (2.7%)
$ 15,000 Continental Airlines, Inc.,
          6.75%, 4/15/06          $  24,450
  20,000 Quantum Corp.,
          7.00%, 8/01/04             19,475
  20,000 Micron Technology, Inc.,
          7.00%, 7/01/04             19,875
- -------------------------------------------

Total bonds (cost: $60,314)          63,800
- -------------------------------------------

            SHORT-TERM (1.9%)
         Commercial Paper
  44,532 Household Finance Corp.,
          5.60%, 2/02/98
          (cost: $44,518)            44,518
- -------------------------------------------

Total investments (cost:
   $1,771,854)                  $ 2,376,999
===========================================




INCOME STOCK FUND
NOTES TO PORTFOLIO OF INVESTMENTS IN SECURITIES

January 31, 1998
(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.


See accompanying notes to financial statements.





INCOME STOCK FUND
STATEMENT OF OPERATIONS
(IN THOUSANDS)

Six-month period ended January 31, 1998
(Unaudited)

Net investment income:
   Income:
      Dividends                                                       $ 50,586
      Interest                                                           2,551
                                                                      --------
         Total income                                                   53,137
                                                                      --------
   Expenses:
      Management fees                                                    5,727
      Transfer agent's fees                                              1,345
      Custodian's fees                                                     122
      Postage                                                              149
      Shareholder reporting fees                                            41
      Directors' fees                                                        2
      Registration fees                                                     87
      Professional fees                                                     18
      Other                                                                 36
                                                                      --------
         Total expenses                                                  7,527
                                                                      --------
            Net investment income                                       45,610
                                                                      --------
Net realized and unrealized gain on investments:
   Net realized gain                                                    42,316
   Change in net unrealized appreciation/depreciation                  105,075
                                                                      --------
            Net realized and unrealized gain                           147,391
                                                                      --------
Increase in net assets resulting from operations                      $193,001
                                                                      ========


See accompanying notes to financial statements.





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

Six-month period ended January 31, 1998
and Year ended July 31, 1997
(Unaudited)

                                                       1/31/98        7/31/97
                                                       -------        -------
From operations:
   Net investment income                             $   45,610     $   91,552
   Net realized gain on investments                      42,316        111,015
   Change in net unrealized appreciation/depreciation
     of investments                                     105,075        326,818
                                                     ----------     ----------
     Increase in net assets resulting from operations   193,001        529,385
                                                     ----------     ----------
Distributions to shareholders from:
   Net investment income                                (45,274)       (89,087)
                                                     ----------     ----------
   Net realized gains                                  (118,394)       (80,728)
                                                     ----------     ----------
From capital share transactions:
   Proceeds from shares sold                            135,515        260,043
   Dividend reinvestments                               152,984        158,556
   Cost of shares redeemed                             (130,501)      (302,609)
                                                     ----------     ----------
     Increase in net assets from capital share
       transactions                                     157,998        115,990
                                                     ----------     ----------
Net increase in net assets                              187,331        475,560
Net assets:
   Beginning of period                                2,186,329      1,710,769
                                                     ----------     ----------
   End of period                                     $2,373,660     $2,186,329
                                                     ==========     ==========
Undistributed net investment income included in net
  assets:
    End of period                                    $    5,196     $    4,860
                                                     ==========     ==========
Change in shares outstanding:
   Shares sold                                            7,078         15,238
   Shares issued for dividends reinvested                 8,170          9,566
   Shares redeemed                                       (6,820)       (17,704)
                                                     ----------     ----------
      Increase in shares outstanding                      8,428          7,100
                                                     ==========     ==========
Authorized shares of $.01 par value                     135,000        135,000
                                                     ==========     ==========

See accompanying notes to financial statements.





INCOME STOCK FUND
NOTES TO FINANCIAL STATEMENTS

January 31, 1998
(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
Income Stock Fund (the Fund). The Fund's investment  objective is current income
with the prospect of  increasing  dividend  income and the potential for capital
appreciation.  USAA Investment Management Company (the Manager) seeks to achieve
this objective by investing the Fund's assets primarily in equity  securities of
well-established, large companies with above-average dividend yields and in real
estate investment trusts (REITs).

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

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

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

4.  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 two joint short-term  revolving
loan  agreements  totaling  $850  million,  one with  USAA  Capital  Corporation
(CAPCO),  an affiliate of the Manager ($750 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 its agreement 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  NationsBank,
the Fund may borrow from NationsBank an amount which, when added to  outstanding
borrowings  under the CAPCO  agreement,  does not exceed 25% of the Fund's total
assets at NationsBank's borrowing rate plus a markup. The Fund had no borrowings
under either of these  agreements  during the six-month period ended January 31,
1998.


(3) DISTRIBUTIONS
Distributions  of net investment  income are made  quarterly.  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
Purchases and sales of  securities,  excluding  short-term  securities,  for the
six-month  period ended  January 31, 1998 were  $190,366,170  and  $126,223,670,
respectively.

Gross unrealized  appreciation and depreciation of investments as of January 31,
1998 was $618,568,626 and $13,424,323, respectively.


(5) TRANSACTIONS WITH MANAGER
A. Management  fees - The investment  policies of the Fund and management of the
Fund's  portfolio  is carried out by USAA  Investment  Management  Company.  The
Fund's management fees are computed at .50% 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 $23.50 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 amount of
brokerage  commissions  paid to USAA  Brokerage  Services  during the  six-month
period ended January 31, 1998 was $5,512.


(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, 1998,  the Association  and its affiliates
owned 3,671,121  shares (3.0%) 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 any compensation from the Fund.


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

<TABLE>
<CAPTION>

                             Six-Month                                                Ten-Month
                           Period Ended                                              Period Ended     Year Ended
                            January 31,            Year Ended July 31,                 July 31,      September 30,
                                             --------------------------------
                               1998           1997        1996          1995            1994            1993
                               ----           ----        ----          ----            ----            ----
<S>                        <C>          <C>           <C>           <C>             <C>             <C>

Net asset value at
   beginning of period     $    19.01   $    15.85    $   14.96     $    13.50      $    14.95      $    13.42
Net investment income             .37          .81          .77            .74             .60             .71
Net realized and
   unrealized gain (loss)         .38         3.88         1.16           1.69           (1.12)           1.62
Distributions from net
   investment income             (.20)        (.79)        (.77)          (.75)           (.74)           (.71)
Distributions of realized
   capital gains                 (.33)        (.74)        (.27)          (.22)           (.19)           (.09)
                           ----------   ----------    ---------     ----------      ----------      ----------
Net asset value at
   end of period           $    19.23   $    19.01    $   15.85     $    14.96      $    13.50      $    14.95
                           ==========   ==========    =========     ==========      ==========      ==========
Total return (%) *               8.88        31.46        13.21          18.83           (3.53)          18.05
Net assets at
   end of period (000)     $2,373,660   $2,186,329   $1,710,769     $1,408,371      $1,190,024      $1,043,686
Ratio of expenses to
   average net assets (%)         .66(a)       .68          .72            .75             .73(a)          .70
Ratio of net investment
   income to average
   net assets (%)                3.97(a)      4.73         4.84           5.34            5.25(a)         5.43
Portfolio turnover (%)           5.67        34.95        32.38          34.94           24.82           26.98
Average commission
   rate paid per share+    $    .0498   $    .0499    $   .0500


  *Assumes reinvestment of all dividend income and capital gain distributions during the period.
  +Calculated by aggregating all commissions paid on the purchase and sale of securities and dividing by the
   actual number of shares purchased or sold for which commissions were charged.
(a)Annualized. The ratio is not necessarily indicative of 12 months of operations.

</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
                          Call toll free - Central Time
                     Monday - Friday 8:00 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 Touchline(Registered 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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