AMERICAN CENTURY PREMIUM RESERVES INC
N-30D, 1998-05-28
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                                    ANNUAL
                                    REPORT

                        [american century logo(reg. sm)]
                                    American
                                Century(reg.tm)

                                MARCH 31, 1998

                                    BENHAM
                                     GROUP

                          Premium Government Reserve
                            Premium Capital Reserve

                               TABLE OF CONTENTS
Report Highlights .........................................................    1
Our Message to You ........................................................    2
Services Update ...........................................................    3
Credit Review .............................................................    4
Premium Government Reserve
           Performance & Portfolio Information ............................    5
           Management Q & A ...............................................    6
           Schedule of Investments ........................................    8
           Financial Highlights ...........................................   20
Premium Capital Reserve
           Performance & Portfolio Information ............................    9
           Management Q & A ...............................................   10
           Schedule of Investments ........................................   12
           Financial Highlights ...........................................   21
Statements of Assets and Liabilities ......................................   15
Statements of Operations ..................................................   16
Statements of Changes in Net Assets .......................................   17
Notes to Financial Statements .............................................   18
Independent Auditors' Report ..............................................   22
Retirement Account Information ............................................   23
Background Information
           Investment Philosophy & Policies ...............................   24
           Comparative Indices ............................................   24
           Lipper Rankings ................................................   24
           Investment Team Leaders ........................................   24
Glossary ..................................................................   25

       American Century  Investments  offers you nearly 70 fund choices covering
stocks,  bonds,  money markets,  specialty  investments and blended  portfolios.
We've organized our funds into three distinct groups,  based on investment style
and objectives, to help simplify your fund decisions. These groups appear below.

                 AMERICAN CENTURY INVESTMENTS--FAMILY OF FUNDS
- -------------------------------------------------------------------------------
        Benham                American Century          Twentieth Century
         Group                     Group                      Group
- -------------------------------------------------------------------------------
   MONEY MARKET FUNDS         ASSET ALLOCATION &           GROWTH FUNDS
 GOVERNMENT BOND FUNDS          BALANCED FUNDS          INTERNATIONAL FUNDS
 DIVERSIFIED BOND FUNDS   CONSERVATIVE EQUITY FUNDS
  MUNICIPAL BOND FUNDS         SPECIALTY FUNDS
- -------------------------------------------------------------------------------
Premium Government Reserve
  Premium Capital Reserve

We welcome your comments or questions about this report.  See the back cover for
ways to contact us by mail, phone or e-mail.

American  Century and Benham  Group are  registered  marks of  American  Century
Services Corporation.


                         AMERICAN CENTURY INVESTMENTS


                               REPORT HIGHLIGHTS

CREDIT REVIEW

*   Corporate credit conditions remained healthy during the past year.

*   Thanks to our credit  research  team,  our money  market  funds have avoided
    Japanese  banks,  which  continued to  deteriorate  as a result of the Asian
    financial meltdown.

*   Our credit  team has  doubled in size over the past year;  a larger and more
    diverse group will give us a better opportunity to add value to our funds.

PREMIUM GOVERNMENT RESERVE

*   The fund returned 5.25% for the fiscal year ended March 31, 1998. (See Total
    Returns on page 5.)

*   We shortened  Premium  Government  Reserve's  average maturity in early 1998
    because we weren't getting much extra yield for longer-maturity securities.

*   With money market yields in a narrow range, we bought more agency securities
    when  yields were at the top of the range and did more  selling  when yields
    were at the bottom of the range.

*   We cut back on government  discount  notes because we found more  attractive
    values among traditional government notes.

*   It's likely that the Federal  Reserve will keep interest rates steady in the
    coming months, but if the Fed moves, we expect it to raise rates.

*   We plan to maintain the portfolio's  current neutral positioning until there
    is a clearer direction for interest rates.

PREMIUM CAPITAL RESERVE

*   The fund returned  5.38% for the fiscal year ended March 31, 1998 (See Total
    Returns on page 9.)

*   We left  the  portfolio  in a  neutral  position  for  most  of the  period,
    reflecting the prevailing uncertainty about the future direction of interest
    rates.

*   The financial  crisis in Southeast Asia had little impact on Premium Capital
    Reserve.  We reduced our modest  Japanese  industrial  holdings and replaced
    them with higher-quality U.S. securities.

*   To help boost the fund's yield, we bought more  variable-rate  notes,  whose
    yields are typically higher than those of fixed-rate securities.

*   We believe interest rates should remain stable in the near term,  especially
    while U.S.  economic strength and Asian economic weakness continue to offset
    each other.

*   As long as interest rates remain stable, we plan to maintain the portfolio's
    current  neutral  positioning.  In  addition,  we'll look to  diversify  our
    holdings with commercial paper issued by U.S. industrial companies.


                    PREMIUM
              GOVERNMENT RESERVE

TOTAL RETURNS:              AS OF 3/31/98
     6 Months                      2.59%*
     1 Year                         5.25%

7-DAY CURRENT YIELD:                5.10%

NET ASSETS:                 $44.5 million
     (AS OF 3/31/98)

INCEPTION DATE:                    4/1/93

TICKER SYMBOL:                      TWPXX


                    PREMIUM
                CAPITAL RESERVE

TOTAL RETURNS:               AS OF 3/31/98
     6 Months                       2.67%*
     1 Year                          5.38%

7-DAY CURRENT YIELD:                 5.22%

NET ASSETS:                 $182.5 million
     (AS OF 3/31/98)

INCEPTION DATE:                     4/1/93

TICKER SYMBOL:                       TCRXX

* Not annualized.

Past performance does not guarantee future results.

Money market funds are neither insured nor guaranteed by the U.S. government.

Yields will fluctuate, and there can be no assurance that the funds will be able
to maintain a stable $1.00 share price.


ANNUAL REPORT                                     REPORT HIGHLIGHTS       1


                              OUR MESSAGE TO YOU

           [photo of James E. Stowers, Jr. and James E. Stowers III]

    During  the 12 months  ended  March  31,  1998,  the  Federal  Reserve  held
short-term  interest  rates  steady  against a  backdrop  of low  inflation,  an
improving  federal  budget,  and a healthy  economy.  As a result,  money market
yields were relatively  stable.  Shareholders in Premium  Government Reserve and
Premium Capital Reserve continued to enjoy competitive money market returns.

    The past year has been eventful for American  Century.  We gained a powerful
business  partner in January,  when J.P.  Morgan became a  substantial  minority
shareholder.  The new business  partnership  will allow both  companies to offer
investors a highly diverse menu of investment options and services.

    Another  significant event was the retirement of Jim Benham,  founder of the
Benham Group, in December.  With the integration of Benham and Twentieth Century
successfully  completed,  Jim felt it was time to step back  from the  business.
Much of the Benham culture has become a part of American Century,  including the
educational investor seminar program Jim created. Two of his sons, Jim A. Benham
and Tim Benham, remain with the company to carry on the Benham tradition.

    We're also working  hard to prepare our  computer  systems for the year 2000
(Y2K). The Y2K problem, which has been widely publicized in the financial press,
refers to the possible inability of computer systems to distinguish  between the
years  1900 and  2000  when  the new  millenium  begins.  Like  other  financial
companies,  many of our computer operations involve some type of date comparison
or date  calculation.  Although much of our system is already Y2K compliant,  we
anticipate the rest will be in compliance by the end of this year.

    In  closing,  we are  proud to note that  1998  marks  the 40th  year  since
American  Century  launched its first mutual funds.  Not many fund companies can
claim a 40-year  track record,  or a fund family that includes  nearly 70 stock,
bond,  money market and blended  (stock and bond) funds that  provide  investors
with such a wide range of choice and  flexibility.  We believe  American Century
has an outstanding group of funds to help you reach your financial goals.

    Thank you for your investment.

Sincerely,

/s/James E. Stowers, Jr.                     /s/James E. Stowers III
James E. Stowers, Jr.                        James E. Stowers III
Chairman of the Board and Founder            Chief Executive Officer


2      OUR MESSAGE TO YOU                     AMERICAN CENTURY INVESTMENTS


                                SERVICES UPDATE

    We get many questions from money market  investors about our services.  Here
are answers to several frequently asked questions.

IS THERE A FEE FOR WRITING CHECKS AGAINST MY MONEY MARKET FUND?

    No. You can write as many  checks as you want at no charge,  as long as each
one is for $100 or more.

BESIDES WRITING A CHECK, HOW ELSE CAN I ACCESS MY MONEY?

    There are a couple of easy ways.  First, we can send a check directly to you
at your  address of  record.  All you need to do is give us a call or write us a
letter requesting the check, and we'll send it right out to you.

    We can also make automatic deposits from your money market fund to your bank
account.  Just make sure we have all of your bank  information on file, and then
give us a call to request a direct transfer to your bank account.

IS THERE A LIMIT TO THE NUMBER OF  EXCHANGES  I CAN MAKE OUT OF MY MONEY  MARKET
FUND?

    No.  Exchanges  involve  moving  money  from one  American  Century  fund to
another. Although there is a limit of six exchanges per calendar year out of our
bond and stock funds, there is no limit for money market funds.

Exchanges can be made by:

*   calling an Investor Services representative
    (1-800-345-2021)

*   dialing into our Automated Information Line  
    (1-800-345-8765)

*   writing us a letter

*   connecting to our Web site
    (www.americancentury.com)

    You can also make  exchanges  through our  Automatic  Exchange  plan or Open
Order service.

HOW DO OPEN ORDERS WORK?

    Open Orders enable you to buy or sell shares in a mutual fund  automatically
at a price you designate. Here's how it works:

*   To  Buy--select  a fund in which you wish to invest  and  specify a price at
    which you'd like to buy shares.  Because the object is to buy low, the price
    you specify must be at or below the fund's last closing price. If the fund's
    price closes at or below your specified  price, we will  automatically  move
    the amount you designated from your money market fund into an account in the
    fund you selected.

*   To  Sell--select a fund in which you own shares and specify a price at which
    you'd like to sell them.  Because the object is to sell high,  the price you
    specify  must be at or above the fund's last  closing  price (we can't place
    stop-loss  orders).  If the fund's price  closes at or above your  specified
    price,  we'll sell the number of shares you designated and move the proceeds
    into your money market fund.

Some other notes about Open Orders:

*   Open  Orders  last for a maximum of 90 days and may be  canceled or extended
    whenever you choose.

*   Once you've  placed,  canceled,  or modified  your Open Order,  we'll send a
    letter confirming your decision to your address of record.

IF  YOU  HAVE  ANY  QUESTIONS   ABOUT  OUR   SERVICES,   CALL  US  TOLL-FREE  AT
1-800-345-2021 OR E-MAIL US AT OUR WEB SITE (WWW.AMERICANCENTURY.COM).


ANNUAL REPORT                                       SERVICES UPDATE       3


                                 CREDIT REVIEW

CREDIT CONDITIONS STILL STRONG OVERALL

    During the year ended March 31, 1998,  corporate  credit  conditions  in the
U.S. remained healthy. The U.S. economy grew by 3.6% for the year, which boosted
earnings growth for many businesses and helped keep corporate  credit quality at
its highest level this decade.

ASIAN FLU

    We've written before about the domestic problems facing Japanese banks, from
overcapacity  to weak  underwriting  to bad real  estate  loans.  The  financial
meltdown in Asia has broadened the scope of their problems and further  weakened
their  credit  quality.  By repeating  domestic  lending  mistakes  across Asia,
Japanese banks have become more vulnerable than ever.

    Our credit research team anticipated the Japanese banking system's  problems
some time ago. Our money market funds have not invested in any securities issued
or backed by Japanese  banks over the past year, and there are no Japanese banks
currently on our "approved list"--the list of money market security issuers that
meet our stringent internal credit requirements.

    It is clear  that the  Japanese  government  needs to take  some  corrective
action to reform its banking system, but instead it is simply pouring money into
the  system  just to keep it afloat.  Until  serious  reform  occurs (if it ever
does), our funds will continue to stay away from the Japanese banking sector.

    In  contrast,  there are several  non-financial  Japanese  companies  on our
approved list. These companies have several characteristics that we like:

*   WORLDWIDE  FOCUS--they  do business on a global  scale,  and by exporting to
    other regions, they've been able to offset economic weakness at home.

*   MARKET  DOMINATION--they  are among the top  companies  in their  respective
    industries worldwide.

*   DEEP  POCKETS--all have the financial  resources to survive  challenges like
    the Asian economic downturn.

CREDIT TEAM EXPANSION

    American Century's  corporate credit analysis team added four members during
the fiscal year ended March 31,  bringing  the total number of analysts to nine.
The tenth member of our team will begin in June.

    A larger and more diverse  credit team gives us a better  opportunity to add
value to our funds.  For example,  we've expanded our  international  expertise,
which gives our fund managers more investment  alternatives without compromising
our high credit standards.

    In addition,  we are able to look into and get  comfortable in complex areas
that others are not as familiar  with,  such as  asset-backed  securities.  As a
result,  our management  teams can get better value out of their  investments in
these areas.


- --------------------------------------------------------------------------------
CORPORATE CREDIT RESEARCH TEAM
- --------------------------------------------------------------------------------
   Director               Greg Afiesh

   Senior Analyst         Ed Grant

   Analysts               Michael Difley, Kristine Iwafuchi, Lynda Lowry,
                          Gina Sanchez, Tom Vaiana, Daniel Baker

   Associate Analysts     Sudha Mani, Kalpesh Dadbhawala
- --------------------------------------------------------------------------------

4      CREDIT REVIEW                          AMERICAN CENTURY INVESTMENTS


<TABLE>
<CAPTION>
                          PREMIUM GOVERNMENT RESERVE

                                                                              AVERAGE ANNUAL RETURNS
                                          6 MONTHS          1 YEAR           3 YEARS      LIFE OF FUND(2)
- ------------------------------------------------------------------------------------------------------------
TOTAL RETURNS AS OF MARCH 31, 1998(1)

<S>                                         <C>              <C>              <C>          <C>  
Premium Government Reserve ...............  2.59%            5.25%            5.27%        4.63%

90-Day Treasury Bill Index ...............  2.14%            4.74%            5.10%        4.67%

Average Institutional U.S. Government
Money Market Fund(3) .....................  2.63%            5.33%            5.33%        4.74%(4)

Fund's Ranking Among Institutional
U.S. Government Money Market Funds(3) ....   --          54 out of 81     44 out of 69    37 out of 49(4)
</TABLE>

(1) Returns for periods less than one year are not annualized.

(2) Inception date was April 1, 1993.

(3) According to Lipper Analytical Services.

(4) Since  4/30/93,  the date  nearest the fund's  inception  for which data are
    available.

See pages 24-25 for more information  about returns,  the comparative  index and
Lipper fund rankings.


YIELDS AS OF MARCH 31, 1998
                                      7-DAY            7-DAY
                                     CURRENT         EFFECTIVE
                                      YIELD            YIELD
Premium Government Reserve            5.10%            5.23%

Yields are defined in the Glossary on page 25.


PORTFOLIO AT A GLANCE
                                     3/31/98          3/31/97
Number of Securities                   27               29
Weighted Average Maturity            49 days          40 days
Expense Ratio                         0.45%            0.45%

Past performance does not guarantee future results.

Money market funds are neither insured nor guaranteed by the U.S. government.

Yields will fluctuate,  and there can be no assurance that the fund will be able
to maintain a stable $1.00 share price.

Many of the investment  terms in this report are defined in the Glossary on page
25.


ANNUAL REPORT                            PREMIUM GOVERNMENT RESERVE       5


                          PREMIUM GOVERNMENT RESERVE

MANAGEMENT Q & A

    An  interview  with  Amy  O'Donnell,  a  portfolio  manager  on the  Premium
Government Reserve fund investment team.

HOW DID THE FUND PERFORM DURING THE PAST YEAR?

    For the fiscal year ended March 31, 1998, Premium Government Reserve's total
return  was  5.25%,   compared  with  the  5.33%   average   return  of  the  81
"Institutional  U.S. Government Money Market Funds" tracked by Lipper Analytical
Services.  (See the Total  Returns  table on the  previous  page for other  fund
performance comparisons.)

    Although the fund is  categorized as an  institutional  fund, it is intended
for "high net worth" individuals rather than institutions.  Institutional  funds
tend to have  higher  minimum  balances  (e.g.,  $1  million  or more) and lower
expenses (an average of 0.18% per year, compared to the fund's 0.45%).  However,
for  individuals  who are able to meet  Premium  Government  Reserve's  $100,000
minimum investment, the fund generally provides better yields than are available
from non-institutional government money market funds.

    For example,  the fund's  7-day  effective  yield as of March 31, 1998,  was
5.23%, compared with the 5.00% yield of the average non-institutional government
money market fund (according to Lipper).

YOU SHORTENED THE FUND'S AVERAGE MATURITY DURING THE PAST SIX MONTHS. WHY?

    In the first quarter of 1998, many market  participants  began to expect the
Federal  Reserve to lower  interest  rates.  As a result,  investors  pushed the
yields on longer-term  money market securities lower. We sold many of the fund's
longer-term  securities  at a profit and  invested  in  shorter-term  securities
without giving up much yield.  These  transactions  shortened the fund's average
maturity from around 60 days at the end of 1997 to 45-50 days in March.

    Overall,  though, we remained pretty neutral  throughout the fiscal year. We
consider  an average  maturity  of 40-60 days to be a neutral  position  for the
fund. We take a neutral position when we're unsure about the future direction of
interest rates.  With the economic turmoil in Asia calling into question further
U.S.  economic  growth,  we didn't  feel that  there was an  iron-clad  case for
believing that short-term interest rates would rise or fall.

WHY DID YOU REDUCE THE FUND'S STAKE IN GOVERNMENT AGENCY DISCOUNT NOTES OVER THE
PAST SIX MONTHS (SEE THE ACCOMPANYING CHART)?

    We found more  attractive  securities in other  segments of the market.  For
instance,  we added some agency  notes  issued by the  Federal  Farm Credit Bank
(FFCB) in December when they offered better yields than many discount notes.

[pie charts]

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 3/31/98)
U.S. Government Agency
  Discount Notes            66%
U.S. Government
  Agency Notes              30%
Repurchase Agreements        4%


PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 9/30/97)
U.S. Government Agency
  Discount Notes            93%
U.S. Government Agency
  Variable-Rate Notes        4%
U.S. Government
  Agency Notes               3%


6      PREMIUM GOVERNMENT RESERVE             AMERICAN CENTURY INVESTMENTS


                          PREMIUM GOVERNMENT RESERVE

    In addition,  we found  opportunities to buy traditional  government  agency
notes in "odd  lots." An odd lot is a  security  trade for less than the  normal
trading unit of a million dollars. Because of their unusual size, odd lots often
have higher yields than comparable  conventional  (or round) lots.  Finding good
deals among odd lots helped us enhance the fund's yield.

WHAT OTHER STRATEGIES DID YOU USE TO ENHANCE RETURNS?

    One strategy  was "range  trading,"  which we use when money  market  yields
remain in a very narrow  range,  as they did during much of the past six months.
When market  forces--such as supply and demand imbalances or unexpected economic
news--pushed  yields to the high end of this  range,  we  tended  to buy  agency
securities; when yields dipped to the low end of the range, we did more selling.
By actively  exploiting  these  opportunities,  we were able to  increase  total
returns.

WHAT ARE REPURCHASE AGREEMENTS AND WHY  ARE THEY IN THE FUND'S PORTFOLIO?

    In a  repurchase  agreement,  also  known as a  "repo,"  the fund  buys U.S.
government securities from a seller, and the seller agrees to buy the securities
back at a prearranged price and date. The repos we invested in were very liquid,
short-term securities with maturities of one to seven days.

    Repos  are a good  place to park  cash  temporarily  while we look for other
investment  opportunities,  but the main reason we're currently  holding them is
because  their  yields tend to spike up at the end of calendar  quarters.  As we
went into the end of the first  quarter -- which  coincides  with the end of the
fund's  fiscal year -- we increased  our holdings in repos to take  advantage of
that phenomenon.

WHAT'S YOUR OUTLOOK FOR INTEREST RATES OVER THE NEXT SIX MONTHS?

    The  answer  hinges  in large  part on the  economic  health  of Asia.  When
problems in that region first surfaced last year, many observers argued that the
U.S.  economy  would slow in  response  and  inflationary  threats  would  cool.
However,  recent  evidence  indicates  that the effects of Asia's turmoil on the
U.S. economy have been fairly mild.  Unless the Asian crisis has a more dramatic
slowing  effect on U.S.  economic  growth in the months to come,  there could be
upward pressure on interest rates.

    We believe  there's about an even chance that the Fed will hold rates steady
over the near  term.  But if the Fed  chooses  to act,  we think that it is more
likely to raise rates to stave off potential  inflation  rather than to cut them
to stimulate the economy.

WITH THAT OUTLOOK IN MIND, WHAT IS YOUR STRATEGY GOING FORWARD?

    Until we have a better feel for where interest rates are headed,  we plan to
keep the fund's average maturity in a neutral range.  That way, we'll be able to
reinvest  assets  quickly to capture  rising  yields if the Fed raises  interest
rates.

[pie charts]

PORTFOLIO COMPOSITION BY MATURITY (as of 3/31/98)
1-30 Days          47%
31-60 Days         21%
61-90 Days         12%
91-180 Days        16%
181-397 Days        4%


PORTFOLIO COMPOSITION BY MATURITY (as of 9/30/97)
1-30 Days          70%
31-60 Days          1%
61-90 Days          7%
91-180 Days        22%


ANNUAL REPORT                            PREMIUM GOVERNMENT RESERVE       7


                            SCHEDULE OF INVESTMENTS
                          PREMIUM GOVERNMENT RESERVE

MARCH 31, 1998

Principal Amount                                                     Value
- --------------------------------------------------------------------------------

U.S. GOVERNMENT AGENCY DISCOUNT NOTES(1)

                $1,482,000  FHLB Discount Note, 5.48%,
                                7/6/98                          $  1,460,343

                 3,000,000  FHLMC Discount Note, 5.39%,
                                4/15/98                            2,993,712

                 5,000,000  FHLMC Discount Note, 5.60%,
                                4/23/98                            4,982,889

                   816,000  FHLMC Discount Note, 5.48%,
                                4/24/98                              813,143

                 5,000,000  FHLMC Discount Note, 5.38%,
                                4/30/98                            4,978,351

                 1,500,000  FHLMC Discount Note, 5.40%,
                                6/4/98                             1,485,600

                 1,000,000  FHLMC Discount Note, 5.29%,
                                6/12/98                              989,420

                   300,000  FNMA Discount Note, 5.55%,
                                4/7/98                               299,722

                   400,000  FNMA Discount Note, 5.48%,
                                4/9/98                               399,513

                   900,000  FNMA Discount Note, 5.47%,
                                5/7/98                               895,077

                 2,000,000  FNMA Discount Note, 5.40%,
                                5/11/98                            1,988,000

                 1,277,000  FNMA Discount Note, 5.37%,
                                5/14/98                            1,268,809

                 3,000,000  FNMA Discount Note, 5.37%,
                                5/18/98                            2,978,967

                 2,000,000  FNMA Discount Note, 5.37%,
                                5/20/98                            1,985,382

                   963,000  FNMA Discount Note, 5.41%,
                                6/5/98                               953,593

                   328,000  FNMA Discount Note, 5.45%,
                                6/12/98                              324,425

                   128,000  FNMA Discount Note, 5.45%,
                                6/17/98                              126,508

                   143,000  FNMA Discount Note, 5.45%,
                                6/24/98                              141,182

                 1,000,000  FNMA Discount Note, 5.39%,
                                7/14/98                              984,429

                   900,000  FNMA Discount Note, 5.38%,
                                8/20/98                              881,035
                                                           ---------------------

TOTAL U.S. GOVERNMENT
AGENCY DISCOUNT NOTES--66.2%                                      30,930,100
                                                           ---------------------


Principal Amount                                                     Value
- --------------------------------------------------------------------------------

U.S. GOVERNMENT AGENCY SECURITIES(1)

                $5,000,000  FFCB, 5.62%, 4/1/98                 $  5,000,000

                 2,000,000  FFCB, 5.65%, 7/1/98                    1,999,965

                 1,700,000  FHLB, 5.79%, 10/23/98                  1,701,782

                 2,000,000  FNMA, 6.00%, 4/17/98                   2,000,178

                 2,000,000  FNMA MTN, VRN, 5.32%, 7/1/98           1,997,836

                 1,460,000  SLMA, 6.25%, 6/30/98                   1,462,341
                                                           ---------------------

TOTAL U.S. GOVERNMENT
AGENCY SECURITIES--30.3%                                          14,162,102
                                                           ---------------------

TEMPORARY CASH INVESTMENTS--3.5%

Repurchase Agreement, Merrill Lynch & Co.,
    Inc., (U.S. Treasury obligations), in a joint
    trading account at 5.90%, dated 3/31/98,
    due 4/1/98 (Delivery value $1,623,266)                         1,623,000
                                                           ---------------------

TOTAL INVESTMENT SECURITIES--100.0%                              $46,715,202
                                                           =====================

NOTES TO SCHEDULE OF INVESTMENTS

FFCB = Federal Farm Credit Bank

FHLB = Federal Home Loan Bank

FHLMC = Federal Home Loan Mortgage Corporation

FNMA = Federal National Mortgage Association

MTN = Medium Term Note

SLMA = Student Loan Marketing Association

VRN   =  Variable  Rate  Note.  Interest  reset  date is  indicated  and used in
      calculating the weighted average portfolio maturity. Coupon rate indicated
      is effective March 31, 1998.

(1)   The  rates  for U.S.  Government  Agency  Discount  Notes are the yield to
      maturity at purchase.  The rates for U.S. Government Agency securities are
      the stated coupon rates.

See Notes to Financial Statements


8      PREMIUM GOVERNMENT RESERVE             AMERICAN CENTURY INVESTMENTS


<TABLE>
<CAPTION>
                            PREMIUM CAPITAL RESERVE

                                                                             AVERAGE ANNUAL RETURNS
                                         6 MONTHS          1 YEAR           3 YEARS      LIFE OF FUND(2)
- -----------------------------------------------------------------------------------------------------------
TOTAL RETURNS AS OF MARCH 31, 1998(1)

<S>                                        <C>              <C>              <C>          <C>  
Premium Capital Reserve .................  2.67%            5.38%            5.36%        4.71%

90-Day Treasury Bill Index ..............  2.14%            4.74%            5.10%        4.67%

Average Institutional
Money Market Fund(3) ....................  2.67%            5.40%            5.38%        4.80%(4)

Fund's Ranking Among Institutional
Money Market Funds(3) ...................   --         103 out of 177    80 out of 144   61 out of 95(4)
</TABLE>

(1) Returns for periods less than one year are not annualized.

(2) Inception date was April 1, 1993.

(3) According to Lipper Analytical Services.

(4) Since  4/30/93,  the date  nearest the fund's  inception  for which data are
    available.

See pages 24-25 for more information  about returns,  the comparative  index and
Lipper fund rankings.


YIELDS AS OF MARCH 31, 1998
                                      7-DAY           7-DAY
                                     CURRENT        EFFECTIVE
                                      YIELD           YIELD
Premium Capital Reserve               5.22%           5.35%

Yields are defined in the Glossary on page 25.


PORTFOLIO AT A GLANCE
                                     3/31/98         3/31/97
Number of Issuers                      59              42
Weighted Average Maturity            50 days         46 days
Expense Ratio                         0.45%           0.45%

Past performance does not guarantee future results.

Money market funds are neither insured nor guaranteed by the U.S. government.

Yields will fluctuate,  and there can be no assurance that the fund will be able
to maintain a stable $1.00 share price.

Many of the investment  terms in this report are defined in the Glossary on page
25.


ANNUAL REPORT                               PREMIUM CAPITAL RESERVE       9


                            PREMIUM CAPITAL RESERVE

MANAGEMENT Q & A

    An interview with Denise Tabacco and John Walsh,  portfolio  managers on the
Premium Capital Reserve fund investment team.

HOW DID THE FUND PERFORM DURING THE PAST YEAR?

    For the fiscal year ended March 31, 1998,  Premium  Capital  Reserve's total
return  was  5.38%,   compared  with  the  5.40%  average   return  of  the  177
"Institutional Money Market Funds" tracked by Lipper Analytical  Services.  (See
the  Total  Returns  table on the  previous  page  for  other  fund  performance
comparisons.)

    Although the fund is  categorized as an  institutional  fund, it is intended
for "high net worth" individuals rather than institutions.  Institutional  funds
tend to have  higher  minimum  balances  (e.g.,  $1  million  or more) and lower
expenses (an average of 0.18% per year, compared to the fund's 0.45%).  However,
for individuals who are able to meet Premium Capital Reserve's  $100,000 minimum
investment,  the fund generally  provides  better yields than are available from
non-institutional money market funds.

    For example,  the fund's  7-day  effective  yield as of March 31, 1998,  was
5.35%,  compared  with the 4.92%  yield of the average  non-institutional  money
market fund (according to Lipper).

HOW WAS THE FUND POSITIONED DURING THE FISCAL YEAR?

    We  consider  a  weighted  average  maturity  of 50-60  days to be a neutral
position, which we take when we're unsure about the future direction of interest
rates. We moved the fund from a slightly defensive position in the first several
months of the period to a more neutral stance for the remainder of the year.

    After beginning the fiscal year with an average  maturity of around 45 days,
we shortened to a more  defensive  posture of 30-40 days in May. At the time, we
were  concerned  that the Federal  Reserve would raise  interest rates to reduce
inflationary  pressures,  and we wanted to be in a position to quickly translate
those higher rates into a higher fund yield.

    In the months that followed, however, the inflation threat subsided, and the
Fed held interest  rates  steady.  As a result,  we extended the fund's  average
maturity  to 60 days in July.  Given an  uncertain  outlook for  interest  rates
stemming  from the  countervailing  forces of an economic  slowdown in Southeast
Asia and a strong U.S. economy,  we maintained an average maturity of 55-60 days
until late November.

    The average maturity dipped in December,  reflecting a temporary scarcity of
attractively  priced,  longer-maturity  paper. When supply bounced back in early
1998, we extended the average  maturity  back out to about 50-60 days,  where it
remained until the end of the period.

DID THE FINANCIAL PROBLEMS IN SOUTHEAST ASIA HAVE ANY IMPACT ON THE FUND?

    No. Our credit group  spotted the Japanese  banking  sector's  deterioration
quite some time ago (see page 4). As a result, the fund's Japanese holdings were
minimal and limited to the securities of a handful of strong Japanese industrial
companies, like Toyota.

[pie charts]

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 3/31/98)
Commercial Paper           66%
Variable-Rate Notes        18%
Cds                         8%
Asset-Backed Securities     7%
Other 1%


PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 9/30/97)
Commercial Paper           68%
Variable-Rate Notes        17%
Asset-Backed Securities    10%
CDs                         4%
Other                       1%


10      PREMIUM CAPITAL RESERVE                AMERICAN CENTURY INVESTMENTS


                            PREMIUM CAPITAL RESERVE

    As the problems in Southeast Asia intensified,  our conservative  investment
approach led us to further reduce our Japanese industrial  holdings.  Our credit
analysis team  continues to closely  monitor  events in the region to anticipate
the impact of continued Asian weakness on other sectors and economies.

    To  offset  the  reduction  in  Japanese  industrial   holdings,   we  added
high-quality  asset-backed  commercial paper (short-term  securities backed by a
pool of loans or other  debt)  issued  by U.S.  companies.  We were also able to
boost the fund's yield by  increasing  our  investment  in  variable-rate  notes
(VRNs).

HOW DO VRNS HELP ENHANCE THE FUND'S YIELD?

    VRNs are debt securities  whose interest rates change when a designated base
rate changes. Their yields are typically higher than fixed-rate securities. When
choosing  VRNs, a primary factor we consider is how the market  anticipates  Fed
interest rate changes and how that affects different types of VRNs.

    For example, some VRNs are tied to the London Interbank Offered Rate (LIBOR)
, a money market rate that most banks and  corporations  track when  determining
the rate  they'll pay to investors on  short-term  debt.  Others are tied to the
federal  funds rate,  the lending rate  targeted by the Fed for large  overnight
loans between commercial banks.

    The yields on  LIBOR-related  securities  tend to  anticipate  Fed  actions,
rising before  interest rate hikes and falling in advance of rate cuts.  When we
believe  the  Fed is  poised  to  raise  interest  rates,  we  typically  choose
securities  tied to LIBOR to  capture  the higher  yields as early as  possible.
Conversely, when we think that the Fed is poised to reduce rates, we lean toward
VRNs tied to the federal funds rate because their yields  typically  stay higher
longer than the yields of LIBOR-related securities.

WHAT'S YOUR OUTLOOK FOR INTEREST RATES GOING FORWARD?

    We believe  rates should  remain  stable over the near term,  though  market
sentiment  is  currently  divided.  On  one  hand,  the  strength  of  the  U.S.
economy--as  evidenced  by very low  unemployment,  strong  retail sales and low
inventories--has the potential to re-ignite inflationary pressures and force the
Fed to raise rates. On the other hand, we don't know if the economic slowdown in
Southeast Asia has had its full impact on the U.S. economy.  If problems in Asia
translate into slower U.S. economic growth, the Fed could cut rates.

GIVEN THAT OUTLOOK, HOW WILL YOU MANAGE THE FUND OVER THE NEXT SIX MONTHS?

    We plan to maintain the fund's average  maturity around our neutral position
of 50-60 days until there is definitive and sustained  evidence of the direction
of U.S. economic growth, inflation and interest rates. Additionally,  we'll look
for attractively priced commercial paper backed by U.S. industrial  companies to
diversify away from financial services and bank holdings.

[pie charts]

PORTFOLIO COMPOSITION BY CREDIT RATING (as of 3/31/98)
A1+             72%
A1              28%


PORTFOLIO COMPOSITION BY CREDIT RATING (as of 9/30/97)
A1+             74%
A1              21%
A2               5%


ANNUAL REPORT                               PREMIUM CAPITAL RESERVE       11


                            SCHEDULE OF INVESTMENTS
                            PREMIUM CAPITAL RESERVE

MARCH 31, 1998

Principal Amount                                                          Value
- --------------------------------------------------------------------------------

COMMERCIAL PAPER(1)

BANKING--7.3%

             $  1,000,000  Abbey National North America
                               Corp., 5.42%, 4/1/98               $    1,000,000

                1,500,000  Bankers Trust New York Corp.,
                               5.60%, 4/16/98                          1,496,499

                1,100,000  Garanti Funding Corporation,
                               5.55%,  4/20/98 (LOC:
                               Bayerische Verensbank A.G.)             1,096,778

                2,000,000  Generale Bank S.A., 5.50%,
                               4/7/98                                  1,998,167

                4,900,000  IMI Funding Co. (USA),
                               5.52%-5.68%, 6/4/98 through
                               6/29/98                                 4,838,455

                4,500,000  National Australia Funding
                               (Delaware), Inc., 5.40%, 5/26/98        4,462,875
                                                            --------------------

                                                                      14,892,774
                                                            --------------------

CREDIT CARD & TRADE RECEIVABLES--7.6%

                1,000,000  Charta Corporation, 5.57%,
                               4/13/98 (AMBAC) (Acquired
                               3/2/98, Cost $993,502)(2)                 998,143

                5,000,000  Corporate Receivables Corp.,
                               5.52%, 5/12/98 (LOC: Citibank,
                               N.A.) (Acquired 3/12/98, Cost
                               $4,953,233)(2)                          4,968,567

                4,800,000  Dakota Certificates (Citibank),  
                               Series 1995-7, 5.45%-5.50%,  
                               4/3/98 through  4/24/98  
                               (Acquired 1/20/98 through
                               2/24/98, Cost $4,762,791)(2)            4,794,440

                4,800,000   WCP Funding Inc.,  5.52%-5.53%,  
                               5/27/98 through 5/28/98 
                               (AMBAC) (Acquired 3/17/98 
                               through 3/24/98, Cost
                               $4,749,156)(2)                          4,758,276
                                                            --------------------

                                                                      15,519,426
                                                            --------------------

DIVERSIFIED COMPANIES--3.4%

                 7,100,000  Mitsubishi International,
                                5.50%-5.65%, 4/6/98 through
                                5/22/98                                7,063,861
                                                            --------------------

EDUCATION--0.5%

                 1,100,000  Leland Stanford University, 5.57%,
                                4/30/98                                1,095,064
                                                            --------------------


Principal Amount                                                          Value
- --------------------------------------------------------------------------------

ELECTRICAL PRODUCTS--1.7%

              $  3,500,000  Siemens Corp., 5.50%, 6/19/98         $    3,457,757
                                                            --------------------

FINANCIAL SERVICES--16.5%

                 4,000,000  Ameritech Capital Funding Corp.,
                                5.43%, 4/10/98                         3,994,570

                10,200,000  Ford Motor Credit, 5.46%-5.49%,
                                4/3/98 through 6/4/98                 10,158,388

                 7,000,000  General Electric Capital Corp.,
                                5.37%-5.47%, 4/1/98
                                through 6/5/98                         6,955,595

                 3,500,000  General Electric Capital Services,
                                Inc., 5.47%, 4/14/98                   3,493,087

                 5,700,000  General Motors Acceptance Corp.,
                                5.43%, 4/27/98                         5,677,647

                 3,500,000  Hitachi Credit America Corp.,
                                5.55%-5.57%, 4/16/98
                                through 6/11/98                        3,474,528
                                                            --------------------

                                                                      33,753,815
                                                            --------------------

FOOD & BEVERAGE--1.0%

                 2,000,000  Brown-Foreman Corp., 5.55%,
                                4/13/98                                1,996,300
                                                            --------------------

INSURANCE--5.4%

                 5,000,000  American Family Financial Services,
                                Inc., 5.48%-5.52%, 4/2/98
                                through 4/21/98                        4,993,411

                 3,000,000  SAFECO Corporation, 5.50%,
                                4/8/98 (Acquired 1/27/98,
                                Cost $2,967,458)(2)                    2,996,791

                 3,000,000  USAA Capital Corp., 5.44%,
                                4/13/98                                2,994,560
                                                            --------------------

                                                                      10,984,762
                                                            --------------------

LEISURE--2.0%

                 4,200,000  Fuji Photo Film Finance, 5.52%,
                                5/14/98                                4,172,308
                                                            --------------------

METALS & MINING--2.1%

                 4,400,000  Rio Tinto, America, 5.42%-5.46%, 
                                4/17/98 through
                                5/15/98 (Acquired 1/14/98 through
                                2/10/98, Cost $4,337,628)(2)           4,376,608
                                                            --------------------

PUBLISHING--0.9%

                1,881,000   Reed Elsevier Inc., 5.55%, 4/8/98          1,878,970
                                                            --------------------

See Notes to Financial Statements


12      PREMIUM CAPITAL RESERVE                AMERICAN CENTURY INVESTMENTS


                            SCHEDULE OF INVESTMENTS
                            PREMIUM CAPITAL RESERVE

MARCH 31, 1998

Principal Amount                                                          Value
- --------------------------------------------------------------------------------

RETAIL--1.8%

              $  3,800,000  Southland Corp., 5.42%-5.52%,
                                6/12/98 through 8/18/98           $    3,748,161
                                                            --------------------

SECURITY BROKERS & DEALERS--14.5%

                 5,000,000  BT Securities Corp., 5.37%,
                                7/15/98                                4,921,687

                 8,000,000  Credit Suisse First Boston, 5.41%,
                                4/22/98                                7,974,719

                 8,500,000  Goldman Sachs Group, L.P.,
                                5.42%-5.70%, 4/15/98
                                through 5/6/98                         8,472,893

                 3,500,000  Merrill Lynch & Co., Inc.,
                                5.45%-5.51%, 5/15/98 through
                                5/20/98                                3,475,008

                 5,000,000  Morgan Stanley, Dean Witter,
                                Discover & Co., 5.43%-5.47%,
                                5/8/98 through 5/26/98                 4,969,216
                                                            --------------------

                                                                      29,813,523
                                                            --------------------

SOVEREIGN GOVERNMENTS &
AGENCIES--0.7%

                 1,500,000  Kingdom of Sweden, 5.55%,
                                5/4/98                                 1,492,369
                                                            --------------------

UTILITIES--0.5%

                 1,000,000  National Rural Utilities Cooperative
                                Finance Corp., 5.50%, 4/24/98            996,435
                                                            --------------------

TOTAL COMMERCIAL PAPER--65.9%                                        135,242,133
                                                            --------------------

CORPORATE DEBT

                 5,000,000  Abbey National Treasury Services PLC, 
                                Series 1A, VRN, 5.57%,  4/15/98,  
                                resets  monthly  off the
                                1-month LIBOR minus 0.12%
                                with no caps                           4,999,348

                 4,000,000  American Express Centurion Bank, 
                                VRN, 5.63%, 4/11/98, 
                                resets monthly off the 1-month LIBOR
                                minus 0.06% with no caps               4,000,000

                 2,000,000  First Bank N.A., VRN, 5.59%,
                                4/15/98, resets monthly off the
                                1-month LIBOR minus 0.10%
                                with no caps                           1,999,816


Principal Amount                                                          Value
- --------------------------------------------------------------------------------

              $  1,500,000  General American Life Insurance
                                Company, VRN, 5.89%, 4/1/98,
                                resets monthly off the 1-month
                                LIBOR plus 0.20% with no caps
                                (Acquired 7/7/97, Cost
                                $1,500,000)(2)(3)                  $   1,500,000

                 4,500,000  General American Life Insurance 
                                Company, VRN, 5.89%,  4/1/98,  
                                resets  monthly off the 1-month
                                LIBOR plus 0.20% with no caps, 
                                (Acquired 1/3/97, Cost
                                $4,500,000)(2)(3)                      4,500,000

                 8,000,000  Key Bank, N.A., VRN, 5.69%, 4/1/98, 
                                resets daily off Fed
                                Funds plus 0.07% with no caps          7,998,136

                   358,000  Merrill Lynch & Co., Inc., VRN,
                                6.00%, 4/1/98, resets daily off
                                Fed Funds plus 0.375% with
                                no caps                                  358,226

                 2,000,000  Merrill Lynch & Co., Inc., VRN,  
                                5.96%,  4/6/98, resets monthly off 
                                the 3-month LIBOR plus
                                0.15% with no caps                     2,004,198

                6,000,000   Transamerica Occidental Life Insurance 
                                Co., VRN, 5.69%, 4/1/98, resets 
                                monthly off the 1-month LIBOR 
                                with no caps (Acquired 6/30/97, Cost
                                $6,000,000)(2)(3)                      6,000,000

                1,600,000   Travelers  Insurance  Company (The),
                                VRN, 5.74%, 4/9/98, resets monthly 
                                off the  1-month  LIBOR
                                plus 0.05% with no caps 
                                (Acquired 6/9/97, Cost
                                $1,600,000)(2)(3)                      1,600,000

                3,000,000   Travelers  Insurance  Company (The), 
                                VRN, 5.74%, 4/23/98, resets monthly 
                                off the 1-month  LIBOR
                                plus 0.05% with no caps 
                                (Acquired 5/23/97, Cost
                                $3,000,000)(2)(3)                      3,000,000
                                                            --------------------

TOTAL CORPORATE DEBT--18.5%                                           37,959,724
                                                            --------------------

See Notes to Financial Statements


ANNUAL REPORT                               PREMIUM CAPITAL RESERVE       13


                            SCHEDULE OF INVESTMENTS
                            PREMIUM CAPITAL RESERVE

MARCH 31, 1998

Principal Amount                                                          Value
- --------------------------------------------------------------------------------

ASSET-BACKED SECURITIES

             $     609,648  Americredit Automobile
                                Receivables Trust, Series
                                1997 C, Cl A1, 5.66%, 9/5/98      $      609,648

                   672,119  Americredit Automobile
                                Receivables Trust, Series
                                1997 D, Cl A1, 5.80%, 11/5/98            672,119

                 3,000,000  ABSIT 97-C, VRN, 5.69%,
                                4/15/98, resets monthly off the
                                1-month LIBOR with no caps
                                (Acquired 6/11/97, Cost
                                $3,000,000)(2)                         3,000,000

                   384,129  Barnett Auto Trust, 
                                Series 1997 A, Cl A1, 5.65%,
                                10/15/98 (Acquired 9/18/97, Cost
                                $384,129)(2)                             384,129

                 1,173,384  Capital Equipment Receivables
                                Trust, Series 1997-1, Cl A1,
                                5.79%, 12/15/98                        1,173,384

                 1,236,349  Ford Credit Auto Owner Trust,
                                Series 1997 B, Cl A1, 5.75%,
                                10/15/98                               1,236,349

                 4,375,962  Ford Credit Auto Owner Trust,
                                Series 1998 A, Cl A1, 5.55%,
                                2/15/99                                4,375,962

                 3,000,000  Racers Series 1997-MM-8-5,  
                                VRN, 5.68%, 4/29/98,
                                resets monthly off the 
                                1-month LIBOR minus 0.01%
                                with no caps (Acquired 8/29/97, Cost
                                $3,000,000)(2)                         3,000,000
                                                            --------------------

TOTAL ASSET-BACKED SECURITIES--7.0%                                   14,451,591
                                                            --------------------

CERTIFICATES OF DEPOSIT

                 2,000,000  ABN Amro Bank N.V., 5.79%,
                                3/26/99                                2,000,754

                 4,000,000  Bayerische Landesbank
                                Gironzentrale, 5.66%, 2/22/99          4,000,000

                 2,000,000  Caisse Nationale de Credit
                                Agricole Indosuez, 5.90%,
                                8/11/98                                2,000,000


Principal Amount                                                          Value
- --------------------------------------------------------------------------------

              $  3,000,000  Deutsche Bank, A.G., 5.70%,
                                3/5/99                            $    2,998,669

                 4,500,000  Royal Bank of Canada, 5.82%,
                                8/25/98                                4,501,903
                                                            --------------------

TOTAL CERTIFICATES OF DEPOSIT--7.6%                                   15,501,326
                                                            --------------------

BANK NOTES--1.0%

                 2,000,000  BankBoston, N.A., 5.83%, 4/9/98            2,000,000
                                                            --------------------

TOTAL INVESTMENT SECURITIES--100.0%                                 $205,154,774
                                                            ====================


NOTES TO SCHEDULE OF INVESTMENTS

AMBAC = AMBAC Assurance Corporation

LIBOR = London Interbank Offered Rate

LOC = Letter of Credit

VRN   =  Variable  Rate  Note.  Interest  reset  date is  indicated  and used in
      calculating the weighted average portfolio maturity. Coupon rate indicated
      is effective March 31, 1998.

resets= The  frequency  with which a  fixed-income  security's  coupon  changes,
      based on  current  market  conditions  or an  underlying  index.  The more
      frequently  a security  resets,  the less risk the investor is taking that
      the coupon will vary significantly from current market rates.

(1) The rates for commercial paper are the yield to maturity at purchase.

(2) Security was purchased under Rule 144A or Section 4(2) of the Securities Act
    of 1933 or is otherwise restricted as to resale and, unless registered under
    the Act or  exempted  from  registration,  may  only  be  sold to  qualified
    institutional  investors.  The aggregate  value of restricted  securities at
    March 31, 1998,  was  $45,876,954,  which  represented  25.1% of net assets.
    Restricted securities which were considered illiquid represented 5.8% of net
    assets.

(3) Funding Agreement.

See Notes to Financial Statements


14      PREMIUM CAPITAL RESERVE                AMERICAN CENTURY INVESTMENTS


                     STATEMENTS OF ASSETS AND LIABILITIES

                                                PREMIUM              PREMIUM
MARCH 31, 1998                             GOVERNMENT RESERVE    CAPITAL RESERVE

ASSETS

Investment securities, at value
  (amortized cost and cost for
  federal income tax purposes)
  (Note 1) .............................    $    46,715,202     $   205,154,774

Interest receivable ....................            250,677             567,741

Receivable for capital shares sold .....              3,937             381,938
                                            ---------------     ---------------
                                                 46,969,816         206,104,453
                                            ---------------     ---------------
LIABILITIES

Disbursements in excess of
  demand deposit cash ..................            217,578             828,306

Payable for capital shares
  redeemed .............................          2,213,612          22,606,361

Accrued management fees
  (Note 2) .............................             18,113              79,087

Dividends payable ......................             25,761             103,774

Accrued expenses and
  other liabilities ....................                 48                 235
                                            ---------------     ---------------
                                                  2,475,112          23,617,763
                                            ---------------     ---------------
Net Assets .............................    $    44,494,704     $   182,486,690
                                            ===============     ===============
CAPITAL SHARES, $0.01 PAR VALUE

Authorized .............................      1,000,000,000       1,000,000,000
                                            ===============     ===============
Outstanding ............................         44,495,084         182,491,064
                                            ===============     ===============
Net Asset Value Per Share ..............    $          1.00     $          1.00
                                            ===============     ===============
NET ASSETS CONSIST OF:

Capital (par value and
  paid-in surplus) .....................    $    44,495,084     $   182,491,064

Accumulated net realized
  loss on investments ..................               (380)             (4,374)
                                            ---------------     ---------------
                                            $    44,494,704     $   182,486,690
                                            ===============     ===============
See Notes to Financial Statements


ANNUAL REPORT                   STATEMENTS OF ASSETS AND LIABILITIES      15


                           STATEMENTS OF OPERATIONS

                                                PREMIUM              PREMIUM
YEAR ENDED MARCH 31, 1998                  GOVERNMENT RESERVE    CAPITAL RESERVE

INVESTMENT INCOME

Income:

Interest .................................       $ 2,522,970        $ 9,678,027
                                                 -----------        -----------
Expenses (Note 2):

Management fees ..........................           203,339            763,533

Directors' fees and expenses .............               423              1,584
                                                 -----------        -----------
                                                     203,762            765,117
                                                 -----------        -----------
Net investment income ....................         2,319,208          8,912,910
                                                 -----------        -----------
Net realized loss
  on investments .........................              (380)            (3,329)
                                                 -----------        -----------
Net Increase in Net Assets
Resulting from Operations ................       $ 2,318,828        $ 8,909,581
                                                 ===========        ===========

See Notes to Financial Statements


16      STATEMENTS OF OPERATIONS               AMERICAN CENTURY INVESTMENTS


                      STATEMENTS OF CHANGES IN NET ASSETS
<TABLE>
<CAPTION>


YEAR ENDED MARCH 31, 1998                       PREMIUM                         PREMIUM
AND MARCH 31, 1997                         GOVERNMENT RESERVE               CAPITAL RESERVE

Increase in Net Assets                      1998             1997             1998             1997

OPERATIONS

<S>                                 <C>              <C>              <C>              <C>          
Net investment income ...........   $   2,319,208    $   1,536,552    $   8,912,910    $   7,139,688

Net realized loss
  on investments ................            (380)            --             (3,329)            (387)
                                    -------------    -------------    -------------    -------------
Net increase in net assets
  resulting from operations .....       2,318,828        1,536,552        8,909,581        7,139,301
                                    -------------    -------------    -------------    -------------
DISTRIBUTIONS TO SHAREHOLDERS

From net investment income ......      (2,319,208)      (1,536,552)      (8,912,910)      (7,139,688)
                                    -------------    -------------    -------------    -------------
CAPITAL SHARE TRANSACTIONS

Proceeds from shares sold .......     115,269,165       57,200,249      380,763,052      244,535,922

Proceeds from reinvestment
  of distributions ..............       2,261,393        1,457,750        8,514,911        6,775,632

Payments for shares redeemed ....    (111,873,462)     (46,010,775)    (360,745,777)    (230,769,999)
                                    -------------    -------------    -------------    -------------
Net increase in net assets
  from capital share transactions       5,657,096       12,647,224       28,532,186       20,541,555
                                    -------------    -------------    -------------    -------------
Net increase in net assets ......       5,656,716       12,647,224       28,528,857       20,541,168

NET ASSETS

Beginning of year ...............      38,837,988       26,190,764      153,957,833      133,416,665
                                    -------------    -------------    -------------    -------------
End of year .....................   $  44,494,704    $  38,837,988    $ 182,486,690    $ 153,957,833
                                    =============    =============    =============    =============
TRANSACTIONS IN SHARES
OF THE FUNDS

Sold ............................     115,269,165       57,200,249      380,763,071      244,535,922

Issued in reinvestment
  of distributions ..............       2,261,393        1,457,750        8,514,911        6,775,632

Redeemed ........................    (111,873,462)     (46,010,775)    (360,745,777)    (230,769,999)
                                    -------------    -------------    -------------    -------------
Net increase ....................       5,657,096       12,647,224       28,532,205       20,541,555
                                    =============    =============    =============    =============
</TABLE>

See Notes to Financial Statements


ANNUAL REPORT                   STATEMENTS OF CHANGES IN NET ASSETS       17


                         NOTES TO FINANCIAL STATEMENTS

MARCH 31, 1998

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    ORGANIZATION -- American Century Premium Reserves, Inc. (the Corporation) is
registered under the Investment  Company Act of 1940 as an open-end  diversified
management  investment  company.  American  Century - Benham Premium  Government
Reserve Fund (Government  Reserve) and American Century - Benham Premium Capital
Reserve Fund (Capital  Reserve) (the Funds) are two of the three funds issued by
the  Corporation.  The  investment  objective of Government  Reserve and Capital
Reserve is to obtain as high a level of  current  income as is  consistent  with
preservation of capital and maintenance of liquidity.  The following significant
accounting  policies,  related to the Funds,  are in accordance  with accounting
policies generally accepted in the investment company industry.

    SECURITY  VALUATIONS  --  Securities  are valued at  amortized  cost,  which
approximates   current  value.  When  valuations  are  not  readily   available,
securities are valued at fair value as determined in accordance  with procedures
adopted by the Board of Directors.

    SECURITY TRANSACTIONS -- Security transactions are accounted for on the date
purchased  or  sold.  Net  realized  gains  and  losses  are  determined  on the
identified cost basis, which is also used for federal income tax purposes.

    INVESTMENT  INCOME -- Interest  income is recorded on the accrual  basis and
includes accretion of discounts and amortization of premiums.

    REPURCHASE AGREEMENTS -- The Funds may enter into repurchase agreements with
institutions that the Funds'  investment  manager,  American Century  Investment
Management,  Inc. (ACIM),  has determined are creditworthy  pursuant to criteria
adopted by the Board of  Directors.  Each  repurchase  agreement  is recorded at
cost. The Funds require that the collateral, represented by securities, received
in a  repurchase  transaction  be  transferred  to  the  custodian  in a  manner
sufficient  to enable  the Funds to obtain  those  securities  in the event of a
default under the repurchase  agreement.  ACIM monitors,  on a daily basis,  the
securities  transferred to ensure the value,  including accrued interest, of the
securities  under each repurchase  agreement is equal to or greater than amounts
owed to the Funds under each repurchase agreement.

    JOINT  TRADING  ACCOUNT --  Pursuant  to an  Exemptive  Order  issued by the
Securities  and  Exchange  Commission,  the Funds,  along with other  registered
investment  companies  having  management  agreements  with ACIM,  may  transfer
uninvested  cash  balances  into a joint  trading  account  held  at the  Funds'
custodian. These balances are invested in one or more repurchase agreements that
are collateralized by U.S. Treasury or Agency obligations.

    INCOME  TAX  STATUS  -- It is  the  Funds'  policy  to  distribute  all  net
investment  income  and  net  realized  capital  gains  to  shareholders  and to
otherwise qualify as a regulated  investment company under the provisions of the
Internal  Revenue Code.  Accordingly,  no provision has been made for federal or
state income taxes.

    DISTRIBUTIONS  TO SHAREHOLDERS -- Distributions  from net investment  income
are declared daily and distributed  monthly.  The Funds do not expect to realize
any long-term capital gains and,  accordingly do not expect to pay any long-term
capital gains distributions.

    At  March  31,  1998,  accumulated  net  realized  short-term  capital  loss
carryovers  of $2,814 for Capital  Reserve  (expiring  2004 through 2006) may be
used to offset future taxable gains. The Fund has elected to treat $1,560 of net
capital losses incurred in the five month period ended March 31, 1998, as having
been incurred in the following fiscal year.

    The  character  of  distributions  made during the year from net  investment
income or net realized gains may differ from their ultimate characterization for
federal income tax purposes.  These differences  reflect the differing character
of certain income items and net capital gains and losses for financial statement
and tax  purposes  and may  result in  reclassification  among  certain  capital
accounts.

    USE OF ESTIMATES -- The  preparation  of financial  statements in conformity
with  generally  accepted  accounting  principles  requires  management  to make
estimates  and  assumptions  that  affect  the  reported  amounts  of assets and
liabilities  and disclosure of contingent  assets and liabilities at the date of
the financial  statements and the reported amounts of increases and decreases in
net assets from operations  during the period.  Actual results could differ from
these estimates.

    ADDITIONAL  INFORMATION -- Effective  January 15, 1998,  Funds  Distributor,
Inc. (FDI) became the  Corporation's  distributor.  Certain  officers of FDI are
also officers of the Corporation.


18      NOTES TO FINANCIAL STATEMENTS          AMERICAN CENTURY INVESTMENTS


                         NOTES TO FINANCIAL STATEMENTS

MARCH 31, 1998
- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

    The  Corporation  has entered  into a  Management  Agreement  with ACIM that
provides the Funds with investment  advisory and management services in exchange
for a single,  unified  fee.  The  Agreement  provides  that all expenses of the
Funds,  except  brokerage  commissions,   taxes,  interest,  expenses  of  those
directors  who  are  not  considered  "interested  persons"  as  defined  in the
Investment  Company  Act of 1940  (including  counsel  fees)  and  extraordinary
expenses, will be paid by ACIM. The fee is computed daily and paid monthly based
on each Fund's average daily closing net assets during the previous  month.  The
annual management fee for each Fund is 0.45%.

    Certain  officers and directors of the  Corporation are also officers and/or
directors,  and,  as a  group,  controlling  stockholders  of  American  Century
Companies,  Inc., the parent of the Corporation's  investment manager, ACIM, the
Corporation's  transfer agent,  American Century Services  Corporation,  and the
registered broker-dealer, American Century Investment Services, Inc.


ANNUAL REPORT                         NOTES TO FINANCIAL STATEMENTS       19


<TABLE>
<CAPTION>
                             FINANCIAL HIGHLIGHTS
                          PREMIUM GOVERNMENT RESERVE

                    For a Share Outstanding Throughout the Years Ended March 31

                                       1998             1997             1996             1995             1994
PER-SHARE DATA

Net Asset Value,
<S>                              <C>              <C>              <C>              <C>              <C>       
Beginning of Year ..........     $     1.00       $     1.00       $     1.00       $     1.00       $     1.00
                                 ----------       ----------       ----------       ----------       ----------
Income From
  Investment Operations

  Net Investment Income ....           0.05             0.05             0.05             0.05             0.03
                                 ----------       ----------       ----------       ----------       ----------
Distributions

  From Net Investment Income          (0.05)           (0.05)           (0.05)           (0.05)           (0.03)
                                 ----------       ----------       ----------       ----------       ----------
Net Asset Value, End of Year     $     1.00       $     1.00       $     1.00       $     1.00       $     1.00
                                 ==========       ==========       ==========       ==========       ==========
  Total Return(1) ..........           5.25%            5.07%            5.49%            4.62%            2.75%


RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses
to Average Net Assets ......           0.45%            0.45%            0.44%            0.45%            0.45%

Ratio of Net Investment
  Income to Average
  Net Assets ...............           5.13%            4.96%            5.30%            4.84%            2.72%

Net Assets, End
of Year (in thousands) .....     $   44,495       $   38,838       $   26,191       $   16,381       $    5,459
</TABLE>

(1) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions, if any.

See Notes to Financial Statements


20      FINANCIAL HIGHLIGHTS                   AMERICAN CENTURY INVESTMENTS


<TABLE>
<CAPTION>
                             FINANCIAL HIGHLIGHTS
                            PREMIUM CAPITAL RESERVE

                    For a Share Outstanding Throughout the Years Ended March 31

                                        1998              1997              1996              1995             1994
PER-SHARE DATA

Net Asset Value,
<S>                              <C>               <C>               <C>               <C>               <C>        
Beginning of Year ..........     $      1.00       $      1.00       $      1.00       $      1.00       $      1.00
                                 -----------       -----------       -----------       -----------       -----------
Income From
  Investment Operations

  Net Investment Income ....            0.05              0.05              0.05              0.05              0.03
                                 -----------       -----------       -----------       -----------       -----------
Distributions

  From Net Investment Income           (0.05)            (0.05)            (0.05)            (0.05)            (0.03)
                                 -----------       -----------       -----------       -----------       -----------
Net Asset Value, End of Year     $      1.00       $      1.00       $      1.00       $      1.00       $      1.00
                                 ===========       ===========       ===========       ===========       ===========
  Total Return(1) ..........            5.38%             5.13%             5.58%             4.66%             2.81%

RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses
to Average Net Assets ......            0.45%             0.45%             0.45%             0.45%             0.45%

Ratio of Net Investment
  Income to Average
  Net Assets ...............            5.26%             5.01%             5.50%             4.76%             2.83%

Net Assets, End
of Year (in thousands) .....     $   182,487       $   153,958       $   133,417       $   138,428       $    38,823

(1)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
     distributions, if any.
</TABLE>

See Notes to Financial Statements


ANNUAL REPORT                                  FINANCIAL HIGHLIGHTS       21


                         INDEPENDENT AUDITORS' REPORT

The Board of Directors and Shareholders,
American Century Premium Reserves, Inc.:

  We have  audited  the  accompanying  statements  of  assets  and  liabilities,
including the schedules of  investments,  of American  Century - Benham  Premium
Government  Reserve Fund and American  Century - Benham Premium  Capital Reserve
Fund  (the  "Funds"),  two of the  funds  comprising  American  Century  Premium
Reserves,  Inc., as of March 31, 1998, and the related  statements of operations
and changes in net assets for the year then ended, and the financial  highlights
for the year then ended. These financial statements and the financial highlights
are the  responsibility  of the  Funds'  management.  Our  responsibility  is to
express an opinion on these  financial  statements and the financial  highlights
based on our audits.  The financial  statements and the financial  highlights of
the Funds for each of the years in the  four-year  period  ended  March 31, 1997
were audited by other auditors whose report,  dated April 25, 1997, expressed an
unqualified opinion on those statements and financial highlights.


  We  conducted  our  audits in  accordance  with  generally  accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable  assurance  about whether the financial  statements and the financial
highlights are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements.  Our procedures  included  confirmation of securities owned at March
31, 1998 by correspondence with the custodian and broker. An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

  In our opinion,  such financial  statements and financial  highlights  present
fairly, in all material  respects,  the financial position of American Century -
Benham  Premium  Government  Reserve Fund and American  Century - Benham Premium
Capital Reserve Fund as of March 31, 1998, the results of their operations,  the
changes in their net  assets,  and the  financial  highlights  for the year then
ended in conformity with generally accepted accounting principles.

Deloitte & Touche LLP
Kansas City, Missouri
April 30, 1998


22      INDEPENDENT AUDITORS' REPORT           AMERICAN CENTURY INVESTMENTS


                        RETIREMENT ACCOUNT INFORMATION

    As required by law,  any  distributions  you receive from an IRA and certain
403(b)  distributions [not eligible for rollover to an IRA or to another 403(b)]
are subject to federal  income tax  withholding  at the rate of 10% of the total
amount withdrawn,  unless you elect not to have withholding  apply. If you don't
want us to withhold on this amount, you may send us a written notice not to have
the federal  income tax  withheld.  Your written  notice is valid for six months
from the date of receipt at American Century.  Even if you plan to roll over the
amount you withdraw to another tax-deferred  account, the withholding rate still
applies to the withdrawn  amount unless we have received a written notice not to
withhold federal income tax within six months prior to the withdrawal.

    When you plan to  withdraw,  you may make your  election by  completing  our
Exchange/  Redemption form or an IRS Form W-4P. Call American Century for either
form.  Your  written  election  is valid  for only six  months  from the date of
receipt at American Century. You may revoke your election at any time by sending
a written notice to us.

    Remember,  even if you elect not to have income tax withheld, you are liable
for paying income tax on the taxable  portion of your  withdrawal.  If you elect
not to have income tax  withheld or you don't have enough  income tax  withheld,
you may be  responsible  for payment of estimated  tax. You may incur  penalties
under the estimated tax rules if your withholding and estimated tax payments are
not sufficient.


ANNUAL REPORT                        RETIREMENT ACCOUNT INFORMATION       23


                            BACKGROUND INFORMATION

INVESTMENT PHILOSOPHY & POLICIES

    The Benham Group  offers 39  fixed-income  funds,  ranging from money market
funds to long-term bond funds and including  both taxable and tax-exempt  funds.
Each fund is  managed  to  provide  a "pure  play" on a  specific  sector of the
fixed-income market. To ensure adherence to this principle,  the basic structure
of each fund's  portfolio  is tied to a specific  market  index.  Fund  managers
attempt  to add  value by making  modest  portfolio  adjustments  based on their
analysis of  prevailing  market  conditions.  Investment  decisions  are made by
management teams, which meet regularly to discuss market analysis and investment
strategies.

    In addition to these principles, each fund has its own investment policies:

    PREMIUM  GOVERNMENT  RESERVE and  PREMIUM  CAPITAL  RESERVE  seek to provide
interest  income while  maintaining  a stable share  price.  Premium  Government
Reserve  invests in U.S.  government  money  market  securities,  while  Premium
Capital Reserve invests in a diversified portfolio of money market securities.

    An  investment  in the funds is neither  insured nor  guaranteed by the U.S.
government,  and  there  can be no  assurance  that  the  funds  will be able to
maintain a stable net asset value of $1 per share.

COMPARATIVE INDICES

    The following index is used in the report for a fund performance comparison.
It is not an investment product available for purchase.

    The 90-DAY  TREASURY BILL INDEX is derived from  secondary  market  interest
rates as published by the Federal Reserve Bank.

LIPPER RANKINGS

    LIPPER  ANALYTICAL  SERVICES,  INC. is an  independent  mutual fund  ranking
service that groups funds according to their investment objectives. Rankings are
based on  average  annual  returns  for each  fund in a given  category  for the
periods indicated. Rankings are not included for periods less than one year.

    The Lipper categories for the Premium Reserve Money Market funds are:

    INSTITUTIONAL  U.S.   GOVERNMENT  MONEY  MARKET  FUNDS  (Premium  Government
Reserve)--funds  with  dollar-weighted  average  maturities of less than 90 days
that intend to maintain a stable net asset value and that invest  principally in
financial instruments issued or guaranteed by the U.S. government,  its agencies
or instrumentalities.

    INSTITUTIONAL  MONEY  MARKET FUNDS  (Premium  Capital  Reserve)--funds  with
dollar-weighted  average maturities of less than 90 days that intend to maintain
a stable net asset value and that invest in high-quality  financial  instruments
rated in the top two grades.

- --------------------------------------------------------------------------------
INVESTMENT TEAM LEADERS
- --------------------------------------------------------------------------------
Portfolio Managers                 Amy O'Donnell, Denise Tabacco,
                                   John Walsh

Credit Research Manager            Greg Afiesh
- --------------------------------------------------------------------------------

24      BACKGROUND INFORMATION                 AMERICAN CENTURY INVESTMENTS


                                   GLOSSARY

RETURNS

* TOTAL  RETURN  figures  show the overall  percentage  change in the value of a
hypothetical  investment  in  the  fund  and  assume  that  all  of  the  fund's
distributions are reinvested.

* AVERAGE ANNUAL RETURNS  illustrate the annually  compounded returns that would
have produced the fund's cumulative total returns if the fund's  performance had
been  constant  over the  entire  period.  Average  annual  returns  smooth  out
variations  in a fund's  return;  they are not the same as  fiscal  year-by-year
results.  For  fiscal  year-by-year  returns,  please  refer  to the  "Financial
Highlights" on pages 20-21.

YIELDS

* 7-DAY  CURRENT  YIELD  is  calculated  based  on the  income  generated  by an
investment  in the fund over a seven-day  period and is  expressed  as an annual
percentage rate.

* 7-DAY  EFFECTIVE  YIELD is  calculated  similarly,  although  this  figure  is
slightly  higher than the fund's 7-Day  Current  Yield because of the effects of
compounding.  The 7-Day  Effective  Yield  assumes  that income  earned from the
fund's investments is reinvested and generating additional income.

PORTFOLIO STATISTICS

* NUMBER OF SECURITIES--the  number of different  securities held by a fund on a
given date.

*  WEIGHTED  AVERAGE   MATURITY   (WAM)--a  measure  of  the  sensitivity  of  a
fixed-income  portfolio to interest rate changes. WAM indicates the average time
until the securities in the portfolio  mature,  weighted by dollar  amount.  The
longer the WAM, the more interest rate  exposure and  sensitivity  the portfolio
has.

* EXPENSE RATIO--the  operating expenses of the fund,  expressed as a percentage
of average net assets.  Shareholders pay an annual fee to the investment manager
for  investment  advisory  and  management  services.  The expenses and fees are
deducted from fund income, not from each shareholder account. (See Note 2 in the
Notes to Financial Statements.)

TYPES OF FIXED-INCOME SECURITIES

* ASSET-BACKED SECURITIES--debt securities that represent ownership in a pool of
receivables, such as credit card debt, auto loans or mortgages.

*  CERTIFICATES  OF DEPOSIT  (CDS)--CDs  represent a bank's  obligation to repay
money deposited with it for a specified period of time.

* COMMERCIAL PAPER  (CP)--short-term  debt issued by large corporations to raise
cash and to cover current expenses in anticipation of future revenues.

* REPURCHASE AGREEMENTS (REPOS)--short-term debt agreements in which a fund buys
a security at one price and simultaneously  agrees to sell it back to the seller
at a slightly higher price on a specified date (usually within seven days).

* U.S. GOVERNMENT AGENCY NOTES--intermediate-term debt securities issued by U.S.
government  agencies  (such as the Federal Farm Credit Bank and the Federal Home
Loan  Bank).  Some  agency  notes are backed by the full faith and credit of the
U.S.  government,  while most are guaranteed only by the issuing  agency.  These
notes are issued with maturities  ranging from three months to 30 years, but the
funds only invest in those with remaining maturities of 13 months or less.

* U.S.  GOVERNMENT AGENCY DISCOUNT  NOTES--short-term  debt securities issued by
U.S.  government  agencies (such as the Federal Farm Credit Bank and the Federal
Home Loan  Bank).  Some agency  discount  notes are backed by the full faith and
credit of the U.S.  government,  while most are  guaranteed  only by the issuing
agency.  These notes are issued at a discount and achieve full value at maturity
(typically one year or less).

* U.S. TREASURY BILLS  (T-BILLS)--short-term  debt securities issued by the U.S.
Treasury  and backed by the direct  "full faith and  credit"  pledge of the U.S.
government.  T-bills are issued with maturities ranging from three months to one
year.

* U.S. TREASURY NOTES (T-NOTES)--intermediate-term debt securities issued by the
U.S.  Treasury  and backed by the direct  "full faith and credit"  pledge of the
U.S.  government.  T-notes are issued  with  maturities  ranging  from two to 10
years, but the funds only invest in those with remaining maturities of 13 months
or less.

* VARIABLE-RATE NOTES (VRNS)--debt securities whose interest rates change when a
designated base rate changes. The base rate is often the federal funds rate, the
90-day Treasury bill rate or the London Interbank Offered Rate.


ANNUAL REPORT                                              GLOSSARY       25

[american century logo(reg. sm)]
            American
        Century(reg.tm)

P.O. BOX 419200
KANSAS CITY, MISSOURI
64141-6200

INVESTOR SERVICES:
1-800-345-2021 OR 816-531-5575

AUTOMATED INFORMATION LINE:
1-800-345-8765

TELECOMMUNICATIONS DEVICE FOR THE DEAF:
1-800-634-4113 OR 816-444-3485

FAX: 816-340-7962

INTERNET: WWW.AMERICANCENTURY.COM

AMERICAN CENTURY PREMIUM RESERVES, INC.

INVESTMENT MANAGER
AMERICAN CENTURY INVESTMENT MANAGEMENT, INC.
KANSAS CITY, MISSOURI

THIS REPORT AND THE STATEMENTS IT CONTAINS ARE SUBMITTED FOR THE GENERAL
INFORMATION OF OUR SHAREHOLDERS. THE REPORT IS NOT AUTHORIZED FOR DISTRIBUTION
TO PROSPECTIVE INVESTORS UNLESS PRECEDED OR ACCOMPANIED BY AN EFFECTIVE
PROSPECTUS.


(c) 1998 AMERICAN CENTURY SERVICES CORPORATION
FUNDS DISTRIBUTOR, INC.

9805           [recycled logo]
SH-BKT-12404      Recycled
<PAGE>
                                    ANNUAL
                                    REPORT

                        [american century logo(reg. sm)]
                                    American
                                Century(reg.tm)


                                MARCH 31, 1998

                                    BENHAM
                                     GROUP

                                 Premium Bond

                               TABLE OF CONTENTS
Report Highlights .......................................................      1
Our Message to You ......................................................      2
Market Perspective ......................................................      3
Performance & Portfolio Information .....................................      4
Management Q & A ........................................................      5
Schedule of Investments .................................................      8
Statement of Assets and Liabilities .....................................     12
Statement of Operations .................................................     13
Statements of Changes in Net Assets .....................................     14
Notes to Financial Statements ...........................................     15
Financial Highlights ....................................................     17
Independent Auditors' Report ............................................     18
Retirement Account Information ..........................................     19
Background Information
           Investment Philosophy & Policies .............................     20
           Comparative Indices ..........................................     20
           Lipper Rankings ..............................................     20
           Investment Team Leaders ......................................     20
Glossary ................................................................     21

       American Century  Investments  offers you nearly 70 fund choices covering
stocks,  bonds,  money markets,  specialty  investments and blended  portfolios.
We've organized our funds into three distinct groups,  based on investment style
and objectives, to help simplify your fund decisions. These groups appear below.

                 AMERICAN CENTURY INVESTMENTS--FAMILY OF FUNDS
- -------------------------------------------------------------------------------
        Benham                American Century          Twentieth Century
         Group                     Group                      Group
- -------------------------------------------------------------------------------
   MONEY MARKET FUNDS         ASSET ALLOCATION &           GROWTH FUNDS
 GOVERNMENT BOND FUNDS          BALANCED FUNDS          INTERNATIONAL FUNDS
 DIVERSIFIED BOND FUNDS   CONSERVATIVE EQUITY FUNDS
  MUNICIPAL BOND FUNDS         SPECIALTY FUNDS
- -------------------------------------------------------------------------------
     Premium Bond

We welcome your comments or questions about this report.  See the back cover for
ways to contact us by mail, phone or e-mail.

American  Century and Benham  Group are  registered  marks of  American  Century
Services Corporation.


                                                AMERICAN CENTURY INVESTMENTS


                               REPORT HIGHLIGHTS

MARKET PERSPECTIVE

*   Favorable economic conditions continued during the 12 months ended March 31,
    1998.  Low  inflation  and healthy  economic  growth  provided an  excellent
    backdrop for investors in U.S. financial markets.

*   Low  inflation--and  low inflation  expectations--caused  interest  rates to
    fall.The  U.S.  bond  market  rallied,   with  intermediate-  and  long-term
    securities producing double-digit returns.

*   Long-term Treasury yields fell sharply. However,  short-term Treasury yields
    remained  relatively  stable,  reflecting the fact that the Federal  Reserve
    kept short-term interest rates unchanged during the period.

*   Falling  long-term rates and relatively  stable  short-term  rates created a
    flat Treasury yield curve. In other words, long-term bonds didn't yield much
    more than  short-term  securities.  Bond  investors  lost some incentive for
    taking on the risk of longer-maturity securities.

*   Treasury securities outperformed other sectors such as corporates,  agencies
    and mortgage-backeds. Treasurys typically outperform other bond sectors when
    interest rates fall sharply.

*   Supply and demand  factors were also  favorable.  A federal  budget  surplus
    resulted in less Treasury  issuance,  and overseas  financial woes made U.S.
    bonds attractive to foreign investors.

MANAGEMENT Q & A

*   Premium  Bond posted its  second-highest  fiscal-year  total return since it
    opened in 1993.  Only in the year  ended  March  31,  1996,  has the  fund's
    fiscal-year return been higher than 11%. (See Total Returns on page 4.)

*   As well as the fund  performed for the period,  it was  outperformed  by its
    benchmark,  the Lehman  Aggregate Bond Index.  One reason was Premium Bond's
    overweighting  in corporate  bonds,  which  underperformed.  In addition,  a
    slightly conservative duration for part of the year held the fund back a bit
    when rates fell and bonds  rallied.  (Duration is a measure of interest rate
    sensitivity.)

*   Although we positioned the  portfolio's  asset mix close to the  benchmark's
    during the first part of the year, the corporate bond sell-off in the fourth
    quarter  of 1997  provided  an  opportunity  to expand  our  corporate  bond
    holdings.

*   Because we expect interest rates to remain relatively low going forward,  we
    will look to build positions in corporate bonds,  mortgage-backed securities
    and other bonds that offer higher yields than Treasury bonds.


                 PREMIUM BOND

TOTAL RETURNS:              AS OF 3/31/98
     6 Months                      4.18%*
     1 Year                        11.14%

30-DAY SEC YIELD:                   5.87%

NET ASSETS:                 $65.2 million
     (AS OF 3/31/98)

INCEPTION DATE:                    4/1/93

TICKER SYMBOL:                      ACBPX

* Not annualized.

Many of the investment  terms in this report are defined in the Glossary on page
21.


ANNUAL REPORT                                     REPORT HIGHLIGHTS       1


                              OUR MESSAGE TO YOU

           [photo of James E. Stowers, Jr. and James E. Stowers III]

    The U.S. bond market  rallied during the 12 months ended March 31, 1998. Low
inflation,  a strong U.S.  dollar,  an improving  federal budget,  and a healthy
economy  created an ideal  environment  for bonds.  Premium Bond's  double-digit
returns reflected this environment.

    The past year has been eventful for American  Century.  We gained a powerful
business  partner in January when J.P.  Morgan,  one of the oldest,  largest and
most respected financial service  institutions in the U.S., became a substantial
minority shareholder.  The new business partnership will allow both companies to
offer investors a highly diverse menu of investment options and services.

    Another  significant event was the retirement of Jim Benham,  founder of the
Benham Group, in December.  With the integration of Benham and Twentieth Century
successfully  completed,  Jim felt it was time to step back  from the  business.
Much of the Benham culture has become a part of American Century,  including the
educational investor seminar program Jim created. Two of his sons, Jim A. Benham
and Tim Benham, remain with the company to carry on the Benham tradition.

    We're also working  hard to prepare our  computer  systems for the year 2000
(Y2K). The Y2K problem, which has been widely publicized in the financial press,
refers to the possible inability of computer systems to distinguish  between the
years  1900 and 2000  when  the new  millennium  begins.  Like  other  financial
companies,  many of our computer operations involve some type of date comparison
or date  calculation.  Although much of our system is already Y2K compliant,  we
anticipate the rest will be in compliance by the end of this year.

    In  closing,  we are  proud to note that  1998  marks  the 40th  year  since
American  Century  launched its first mutual funds.  Not many fund companies can
claim a 40-year  track record,  or a fund family that includes  nearly 70 stock,
bond,  money market and blended  (stock and bond) funds that  provide  investors
with such a wide range of choice and  flexibility.  We believe  American Century
has an outstanding lineup of funds to help you reach your financial goals.

    Thank you for your investment.

Sincerely,

/s/James E. Stowers, Jr.                     /s/James E. Stowers III
James E. Stowers, Jr.                        James E. Stowers III
Chairman of the Board and Founder            Chief Executive Officer


2      OUR MESSAGE TO YOU                     AMERICAN CENTURY INVESTMENTS


                              MARKET PERSPECTIVE

[line graph - data below]

FALLING AND FLATTENING TREASURY YIELD CURVE

                     3/31/97         3/31/98
 YEARS TO
 MATURITY
     1               5.997%          5.380%
     2               6.411%          5.559%
     3               6.562%          5.581%
     4               6.655%          5.597%
     5               6.748%          5.612%
     6               6.779%          5.620%
     7               6.811%          5.628%
     8               6.842%          5.635%
     9               6.874%          5.643%
    10               6.905%          5.651%
    11               6.915%          5.665%
    12               6.924%          5.679%
    13               6.934%          5.693%
    14               6.943%          5.707%
    15               6.953%          5.721%
    16               6.962%          5.735%
    17               6.972%          5.749%
    18               6.981%          5.763%
    19               6.991%          5.777%
    20               7.000%          5.792%
    21               7.010%          5.806%
    22               7.019%          5.820%
    23               7.029%          5.834%
    24               7.038%          5.848%
    25               7.048%          5.862%
    26               7.057%          5.876%
    27               7.067%          5.890%
    28               7.076%          5.904%
    29               7.086%          5.918%
    30               7.095%          5.932%

DOUBLE-DIGIT RETURNS

    While U.S.  stocks grabbed most of the attention,  U.S. bonds quietly posted
double-digit  returns  for the 12 months  ended March 31,  1998.  Inflation--and
inflation   expectations--remained  low,  and  interest  rates  generally  fell,
boosting bond prices. Long-term bonds, which are most sensitive to interest rate
changes,  outperformed intermediate- and short-term securities. For example, the
30-year  Treasury  bond produced a total return of 22.6%,  the 10-year  Treasury
note returned 15.4% and the two-year Treasury note returned 7.5%.

SECTOR RETURNS STRONG BUT VARIED

    Most U.S. bond sectors performed well.  Treasury securities finished on top,
despite  strong  demand for  higher-yielding  securities  such as corporate  and
mortgage-backed  bonds.  These securities  suffered  setbacks that reduced their
returns.  For example,  the Asian crisis hurt the performance of corporate bonds
as investors  questioned  corporate  financial  health.  Falling  interest rates
triggered  a wave of  mortgage  refinancing,  which  had a  negative  effect  on
mortgage-backed  securities. When mortgages are refinanced, it shortens the life
of mortgage-backed securities and forces investors to reinvest in lower-yielding
securities.  But despite  the  volatility,  mortgages  and  corporates  produced
double-digit returns--the Lehman Brothers Fixed-Rate  Mortgage-Backed Securities
Index  returned  11.1%,  and the Lehman  Brothers  Corporate Bond Index returned
13.0%.

ECONOMIC STORY UNCHANGED

    Healthy  economic  growth and low inflation  continued to prevail during the
period.  The U.S. economy grew by 3.6% for the year,  powered by strong consumer
spending,  and unemployment  remained below 5%. Long-term interest rates trended
downward as inflation expectations remained low. Asia's economic problems, which
translated into lower commodity and export prices,  exerted downward pressure on
U.S. prices. The consumer price index, viewed as the broadest gauge of costs for
U.S. goods and services, rose by just 1.4% for the year.

FLATTENING YIELD CURVE

    The Federal  Reserve,  not seeing any  convincing  signs of inflation,  left
short-term  interest  rates  unchanged  at 5.5%.  However,  yields on  long-term
Treasury  bonds fell more than a full  percentage  point.  This  resulted in the
"flat" yield curve shown in the accompanying graph. The yield difference between
a six-month  Treasury bill and a 30-year  Treasury bond was just 68 basis points
on March 31, 1998, compared with 182 basis points at the start of the period. (A
basis point equals 0.01%.)

DIMINISHING SUPPLY, STRONG DEMAND

    The U.S.  government is projected to generate a budget surplus for the first
time in 30 years.  As a result,  the  Treasury  is  reducing  the  amount of new
securities it issues. At the same time, demand remains strong.  Global investors
are  attracted to U.S.  Treasury  bonds,  particularly  in times of political or
financial  unrest.  This  "flight to quality" was  illustrated  during the Asian
crisis in late October, when stock markets throughout the world fell sharply. We
expect these favorable supply and demand factors to continue in 1998.


ANNUAL REPORT                                    MARKET PERSPECTIVE       3


<TABLE>
<CAPTION>
                      PERFORMANCE & PORTFOLIO INFORMATION

                                                                              AVERAGE ANNUAL RETURNS
                                           6 MONTHS          1 YEAR           3 YEARS      LIFE OF FUND(2)
- -------------------------------------------------------------------------------------------------------------
TOTAL RETURNS AS OF MARCH 31, 1998(1)

<S>                                          <C>             <C>               <C>          <C>  
Premium Bond ..............................  4.18%           11.14%            9.03%        6.45%

Lehman Aggregate Bond Index ...............  4.55%           11.99%            9.18%        6.94%

Average A-Rated Corporate Debt Fund(3) ....  4.15%           11.63%            8.73%        6.60%(4)

Fund's Ranking Among
A-Rated Corporate Debt Funds(3) ...........   --          79 out of 139    35 out of 113   32 out of 65(4)

(1) Returns for periods less than one year are not annualized.

(2) Inception date was April 1, 1993.

(3) According to Lipper Analytical Services.

(4) Since  4/30/93,  the date  nearest the fund's  inception  for which data are
    available.
</TABLE>

See pages 20-21 for more information  about returns,  the comparative  index and
Lipper fund rankings.

[mountain graph - data below]

GROWTH OF $100,000 OVER LIFE OF FUND
$100,000 investment made 4/1/93

                                 Value on 3/31/98
                     Premium Bond        Lehman Aggregate Bond Index
4/1/93                 $100,000                  $100,000
Apr-93                 $100,740                  $100,700
May-93                 $100,300                  $100,820
Jun-93                 $101,870                  $102,650
Jul-93                 $102,460                  $103,230
Aug-93                 $104,460                  $105,040
Sep-93                 $104,620                  $105,330
Oct-93                 $104,890                  $105,720
Nov-93                 $104,020                  $104,820
Dec-93                 $104,530                  $105,390
Jan-94                 $105,970                  $106,820
Feb-94                 $103,370                  $104,960
Mar-94                 $100,910                  $102,370
Apr-94                 $99,910                   $101,550
May-94                 $99,770                   $101,540
Jun-94                 $99,530                   $101,320
Jul-94                 $101,650                  $103,330
Aug-94                 $101,540                  $103,460
Sep-94                 $100,020                  $101,930
Oct-94                 $99,810                   $101,840
Nov-94                 $99,590                   $101,620
Dec-94                 $100,250                  $102,320
Jan-95                 $102,120                  $104,340
Feb-95                 $104,630                  $106,820
Mar-95                 $105,430                  $107,480
Apr-95                 $106,990                  $108,980
May-95                 $111,950                  $113,200
Jun-95                 $112,630                  $114,030
Jul-95                 $112,070                  $113,770
Aug-95                 $113,680                  $115,150
Sep-95                 $114,820                  $116,270
Oct-95                 $116,560                  $117,780
Nov-95                 $118,530                  $119,540
Dec-95                 $120,400                  $121,220
Jan-96                 $121,110                  $122,030
Feb-96                 $118,510                  $119,910
Mar-96                 $117,580                  $119,070
Apr-96                 $116,750                  $118,400
May-96                 $116,420                  $118,160
Jun-96                 $117,860                  $119,750
Jul-96                 $118,130                  $120,080
Aug-96                 $117,910                  $119,880
Sep-96                 $119,980                  $121,960
Oct-96                 $122,820                  $124,670
Nov-96                 $125,150                  $126,800
Dec-96                 $123,690                  $125,620
Jan-97                 $123,960                  $126,010
Feb-97                 $124,310                  $126,320
Mar-97                 $122,960                  $124,920
Apr-97                 $124,600                  $126,790
May-97                 $125,630                  $127,990
Jun-97                 $127,030                  $129,510
Jul-97                 $130,500                  $133,000
Aug-97                 $129,230                  $131,870
Sep-97                 $131,170                  $133,810
Oct-97                 $133,140                  $135,750
Nov-97                 $133,530                  $136,380
Dec-97                 $134,640                  $137,750
Jan-98                 $136,400                  $139,520
Feb-98                 $136,090                  $139,410
Mar-98                 $136,650                  $139,890

Past  performance  does not  guarantee  future  results.  Investment  return and
principal  value will fluctuate,  and redemption  value may be more or less than
original cost.

The line representing the fund's total return includes  operating expenses (such
as transaction costs and management fees) that reduce returns, while the index's
total return line does not.


PORTFOLIO AT A GLANCE
                                       3/31/98         3/31/97
Number of Securities                     98               47
Weighted Average Maturity            10.7 years        8.6 years
Average Duration                      4.7 years        4.6 years
Expense Ratio                           0.45%            0.45%


YIELD AS OF MARCH 31, 1998
                                       30-DAY
                                        SEC
                                       YIELD
Premium Bond                           5.87%

Yield is defined in the Glossary on page 21.


4      PERFORMANCE & PORTFOLIO INFORMATION        AMERICAN CENTURY INVESTMENTS


                                MANAGEMENT Q&A

    An  interview  with Bud Hoops and Jeff  Houston,  portfolio  managers on the
Premium Bond fund investment team.

HOW DID THE FUND PERFORM OVER THE LAST YEAR?

    Premium Bond produced a double-digit  total return for the fiscal year ended
March 31, 1998,  reflecting  the generally  strong  performance of the U.S. bond
market. The fund returned 11.14%, while its benchmark, the Lehman Aggregate Bond
Index,  returned  11.99%.  (See the Total Returns table on the previous page for
other fund performance comparisons.)

WHAT CAUSED THE RETURN DISPARITY BETWEEN THE FUND AND ITS BENCHMARK?

    Two factors caused most of the difference--the fund's duration and its asset
allocation.

    Duration  measures a portfolio's  sensitivity to changes in interest  rates.
The longer a fund's  duration,  the more you gain when rates fall,  and the more
you  lose  when  rates  rise.  Conversely,  a  shorter  duration  means  a  bond
portfolio's price fluctuates less when rates change. Premium Bond's duration was
shorter than that of its  benchmark at various  times during the fiscal year, so
the fund didn't benefit as much from the declining  interest rate environment as
the benchmark.

    The second factor behind the  performance gap was our decision to overweight
corporate  bonds,  which  underperformed  Treasurys.  The Asian economic  crisis
created  concerns about a global slowdown and the possible  negative  effects on
corporate  profits and credit  quality.  This led to a corporate  bond  sell-off
during the fourth  quarter of 1997,  when many bond  investors  switched  to the
relative safety of Treasury securities.

[bar graph - data below]

PREMIUM BOND'S ONE-YEAR RETURNS SINCE INCEPTION
(Periods ended March 31)

                  Premium Bond       Lehman Aggregate Bond Index
3/94                  0.92%                   2.37%
3/95                  4.48%                   4.99%
3/96                 11.53%                  10.79%
3/97                  4.57%                   4.91%
3/98                 11.14%                  11.99%

This graph  illustrates the fund's returns since its inception and compares them
with the index's returns.  The fund's total returns include operating  expenses,
while the index's do not. See page 20 for a definition of the index.

Past  performance  is no  guarantee  of future  results.  Investment  return and
principal  value will fluctuate,  and redemption  value may be more or less than
original cost.


ANNUAL REPORT                                      MANAGEMENT Q & A       5


                                MANAGEMENT Q&A

    Although investor demand  eventually  returned as corporates became a better
value relative to Treasurys,  the intensity of the  fourth-quarter  downturn was
enough to affect the fund's overall performance.

WHAT CHANGES DID YOU MAKE TO THE PORTFOLIO DURING THE YEAR?

    During the first half of the fiscal year, we brought the  portfolio  more in
line with its  benchmark.  By  September,  the fund more closely  resembled  the
taxable U.S.  fixed-income market as a whole, which includes a blend of Treasury
bonds, mortgage-backed securities and corporate bonds.

    However,  we boosted our  holdings in  corporate  bonds  during the past six
months.  By March 31, 1998,  about 26% of the fund was  invested in  corporates,
compared to 20% for the benchmark.

WHY DID YOU EXPAND THE FUND'S CORPORATE BOND HOLDINGS?

    The corporate bond sell-off in the fourth quarter of 1997,  while painful in
the short  term,  provided  a window of  opportunity  to find  good  bonds  with
attractive  yields  relative  to  Treasury  securities.   Corporate  bonds  have
traditionally  offered  higher  yields than  Treasurys to  compensate  for their
greater credit risk. The spread,  or difference,  between corporate and Treasury
yields fluctuates as market conditions change.

    For most of the 1990s, the yield spreads between high-grade  corporate bonds
and Treasurys of similar  maturity have narrowed  because  corporates  generally
benefited from improving  economic  conditions and strong investor demand.  This
declining yield spread made finding attractive values among corporate securities
more difficult--until the fourth-quarter sell-off widened the spread.

CAN YOU GIVE SOME EXAMPLES OF RECENT PURCHASES?

    In late 1997 and early  1998,  we bought what we  considered  to be bonds of
well-run  corporations in industry sectors we favored. For example, we purchased
bonds issued by Ameritech,  a regional  telephone  company with a strong balance
sheet.  At the time,  demand for corporate bonds was low, while supply was heavy
because of falling interest rates. As a result, the bond was priced attractively
compared with Treasurys,  and we were confident that we could sell it later at a
higher  price.  Typically,  a bond rated AA like  Ameritech  would  offer only a
modest yield advantage over a comparable  U.S.  Treasury note.  Instead,  at the
time we bought it, the bond's  yield was 72 basis  points  more than the 10-year
Treasury note yield.

    In addition, we found value in sectors as diverse as AAA-rated utility bonds
in California,  regional electric  companies in the United Kingdom,  and various
asset-backed security sectors.

[pie charts]

PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 3/31/98)
U.S. Treasury Securities    27%
Corporate Bonds             26%
Mortgage-Backed
   Securities               25%
Asset-Backed Securities      7%
Cash                         7%
Other                        8%


PORTFOLIO COMPOSITION BY SECURITY TYPE (as of 9/30/97)
U.S. Treasury Securities    47%
Corporate Bonds             18%
Mortgage-Backed
   Securities               17%
Cash                         7%
U.S. Government
   Agency Notes              5%
Other                        6%


6      MANAGEMENT Q & A                           AMERICAN CENTURY INVESTMENTS


                                MANAGEMENT Q&A

(Asset-backed  securities are debt securities that represent ownership in a pool
of assets,  such as credit card debt, auto loans or home equity loans.) We liked
asset-backed securities because we found good values and yields along with a AAA
rating.

WHAT IS THE POTENTIAL IMPACT OF A FEDERAL BUDGET SURPLUS ON THE FUND?

    It should be mostly positive.  The surplus means the government's  borrowing
needs will  shrink,  and the Treasury has already  announced  reductions  in the
amount of securities it will issue going forward.  The lower supply of Treasurys
should  boost their  prices,  and we also expect  investors to buy more bonds in
other sectors of the U.S.  market as Treasurys  become  scarcer.  All else being
equal, the end result should be higher prices and lower yields for all U.S. bond
sectors, as well as favorable returns for fund holdings.

WHAT IS YOUR OUTLOOK FOR THE U.S. BOND MARKET?

    As long as inflation stays low and economic growth remains healthy, the bond
market  should  be a good  place to be.  Although  unemployment  is low and wage
pressures  are  mounting,  there is still no sign of  inflation.  U.S.  economic
growth  is  strong,  but it has  constraints  --the  Asian  economic  crisis  is
projected to reduce U.S. growth somewhat.  The federal government is running its
first budget surplus in 30 years,  which reduces bond supply and exerts downward
pressure on interest  rates.  The stock market could become more  volatile as it
attempts to scale new heights,  possibly  prompting  investors to buy bonds as a
diversification vehicle.

WITH THIS OUTLOOK IN MIND, WHAT IS YOUR STRATEGY FOR THE FUND GOING FORWARD?

    Because we believe  that  interest  rates are likely to remain  within their
current  range--between  5.50% and  6.25% for the  30-year  Treasury  bond,  for
example--we intend to keep the fund's duration near that of its benchmark, which
is currently 4.5 years.  In addition,  we will  continue to emphasize  corporate
bonds, mortgage-backed securities and other investments that offer higher yields
than U.S.  Treasury  bonds.  We'll be working  closely with our credit  research
staff to uncover  attractively  valued  securities with the potential to enhance
returns.

[pie charts]

PORTFOLIO COMPOSITION BY CREDIT RATING (as of 3/31/98)
AAA             74%
AA               3%
A                9%
BBB             14%


PORTFOLIO COMPOSITION BY CREDIT RATING (as of 9/30/97)
AAA             79%
AA               3%
A                9%
BBB              9%


ANNUAL REPORT                                      MANAGEMENT Q & A      7


                            SCHEDULE OF INVESTMENTS

MARCH 31, 1998

Principal Amount                                                    Value
- --------------------------------------------------------------------------------

U.S. TREASURY SECURITIES

             $   5,000,000  U.S. Treasury Notes, 6.25%,
                                3/31/99(1)                       $  5,036,000

                   300,000  U.S. Treasury Notes, 7.125%,
                                9/30/99                               306,525

                 1,000,000  U.S. Treasury Notes, 5.625%,
                                12/31/99                            1,000,800

                   400,000  U.S. Treasury Notes, 7.75%,
                                1/31/00(1)                            414,740

                 1,000,000  U.S. Treasury Notes, 6.375%,
                                5/15/00(1)                          1,015,220

                   200,000  U.S. Treasury Notes, 6.625%,
                                7/31/01                               205,768

                 1,000,000  U.S. Treasury Notes, 7.50%,
                                11/15/01(1)                         1,059,070

                 1,000,000  U.S. Treasury Notes, 6.625%,
                                3/31/02(1)                          1,033,030

                   300,000  U.S. Treasury Notes, 5.50%,
                                1/31/03                               297,996

                   200,000  U.S. Treasury Notes, 6.625%,
                                5/15/07                               212,270

                 1,000,000  U.S. Treasury Bonds, 12.00%,
                                8/15/08                             1,469,070

                 1,000,000  U.S. Treasury Bonds, 9.25%,
                                2/15/16                             1,354,570

                 1,400,000  U.S. Treasury Bonds, 8.875%,
                                8/15/17                             1,857,226

                   400,000  U.S. Treasury Bonds, 7.125%,
                                2/15/23                               456,588

                   300,000  U.S. Treasury Bonds, 7.50%,
                                11/15/24                              358,968

                   475,000  U.S. Treasury Bonds, 7.625%,
                                2/15/25                               576,593

                   300,000  U.S. Treasury Bonds, 6.00%,
                                2/15/26                               299,973

                   850,000  U.S. Treasury Bonds, 6.375%,
                                8/16/27                               898,560

                   250,000  U.S. Treasury Bonds, 6.125%,
                                11/15/27                              256,390
                                                            --------------------

TOTAL U.S. TREASURY SECURITIES -- 26.8%                            18,109,357
                                                            --------------------
   (Cost $17,464,361)


Principal Amount                                                    Value
- --------------------------------------------------------------------------------

U.S. GOVERNMENT AGENCY SECURITIES

                $1,000,000  FHLMC, 6.10%, 11/27/00               $  1,000,660

                   500,000  FHLMC, 7.09%, 11/24/06                    503,605

                   500,000  FNMA MTN, 7.00%, 2/20/07                  513,750

                 1,000,000  FNMA MTN, 7.49%, 5/22/07                1,029,620
                                                            --------------------

TOTAL U.S. GOVERNMENT
AGENCY SECURITIES -- 4.5%                                           3,047,635
                                                            --------------------
   (Cost $2,998,072)

MORTGAGE-BACKED SECURITIES(2)

                   982,226  FHLMC Pool #E68523,
                                6.50%, 10/7/03                        987,205

                   461,158  FHLMC Pool #D75034, 8.50%,
                                10/1/26                               482,260

                   987,527  FHLMC Pool #C00578, 6.50%,
                                1/1/28                                979,171

                 1,317,499  FNMA Pool #272894, 6.00%,
                                2/1/09                              1,304,573

                   887,972  FNMA Pool #392607, 7.00%,
                                7/1/12                                904,540

                   946,739  FNMA Pool #405425, 7.00%,
                                12/1/27                               957,426

                   757,500  FNMA Pool #413812, 6.50%,
                                1/1/28                                750,143

                 1,279,895  GNMA Pool #313107, 7.00%,
                                11/15/22                            1,298,324

                   107,560  GNMA Pool #407141, 9.25%,
                                2/15/25                               116,343

                   327,648  GNMA Pool #408099, 8.75%,
                                3/15/25                               352,162

                   154,034  GNMA Pool #407254, 9.25%,
                                3/15/25                               166,612

                   229,054  GNMA Pool #432437, 7.50%,
                                4/15/27                               235,215

                   950,958  GNMA Pool #447692, 7.50%,
                                5/15/27                               976,537

                   896,568  GNMA Pool #423061, 8.00%,
                                6/15/27                               929,523

                   565,919  GNMA Pool #443782, 7.50%,
                                11/15/27                              581,141

                   158,205  GNMA Pool #461011, 7.50%,
                                11/15/27                              162,461

See Notes to Financial Statements


8      SCHEDULE OF INVESTMENTS                AMERICAN CENTURY INVESTMENTS


                            SCHEDULE OF INVESTMENTS

MARCH 31, 1998

Principal Amount                                                       Value
- --------------------------------------------------------------------------------

                $  699,320  GNMA Pool #467626, 7.00%,
                                2/15/28                           $     707,208

                   693,000  GNMA Pool #458862, 7.50%,
                                2/15/28                                 711,586
                                                               -----------------

TOTAL MORTGAGE-BACKED
SECURITIES -- 18.6%                                                  12,602,430
                                                               -----------------
   (Cost $12,442,011)

FORWARD COMMITMENTS

                 2,000,000  FNMA purchase, 7.00%, settlement
                                4/1/98                                2,021,874

                 2,000,000  FNMA purchase, 7.50%, settlement
                                4/13/98                               2,051,874
                                                               -----------------

TOTAL FORWARD COMMITMENTS -- 6.0%                                     4,073,748
                                                               -----------------
   (Cost $4,074,375)

ASSET-BACKED SECURITIES(2)

                   600,000  California Infrastructure SCE-1,
                                Series 1997-1, Class A6, 6.38%,
                                4/27/05                                 608,523

                 1,000,000  CIT RV Trust, Series 1997 A,
                                Class A6, 6.35%, 11/15/00             1,006,835

                   600,000  Green Tree Financial Corp.,
                                Series 1995-7, Class A3,  6.35%,
                                11/15/26                                602,583

                 1,000,000  Money Store (The) Home Equity
                                Trust, Series 1997 C, Class AF6,
                                6.67%, 3/1/03                         1,007,045

                   404,599  Textron Financial Corp. Receivables
                                Trust, Series 1997 A, Class A,
                                6.05%, 3/16/09 (Acquired
                                9/18/97, Cost $499,337)(3)              405,062

                   500,000  United Companies Financial Corp.,
                                Home Equity Loan, Series
                                1996 D1, Class A5, 6.92%,
                                10/15/18                                509,143

                   500,000  United Companies Financial Corp.,
                                Home Equity Loan, Series
                                1997 C, Class A7, 6.85%,
                                1/15/29                                 505,578

                   398,696  World Omni Automobile Lease
                                Securitization, Series 1996 B,
                                Class A2, 6.20%, 11/15/02               399,858
                                                               -----------------

TOTAL ASSET-BACKED SECURITIES -- 7.5%                                 5,044,627
                                                               -----------------
   (Cost $4,995,412)


Principal Amount                                                       Value
- --------------------------------------------------------------------------------

CORPORATE BONDS

AIRLINES -- 0.7%

               $   461,785  Delta Air Lines, Inc., 7.54%,
                                10/11/11                          $     485,211
                                                               -----------------

AUTOMOBILES & AUTO PARTS -- 0.5%

                   350,000  General Motors Corp., 7.00%,
                                6/15/03                                 362,082
                                                               -----------------

BANKING -- 3.0%

                   250,000  Corestates Capital Corp., 5.875%,
                                10/15/03                                245,890

                   200,000  First Union Corp., 8.77%,
                                11/15/04                                208,642

                   300,000  MBNA Corp., 6.875%, 10/1/99                 303,144

                   500,000  MBNA Global Capital Securities, 
                                VRN, 6.45%, 5/1/98, resets 
                                quarterly off the 3-month LIBOR
                                plus 0.80% with no caps                 460,676

                   500,000  National Bank of Canada, 8.125%,
                                8/15/04                                 542,290

                   300,000  Santander Financial Issuances Ltd.,
                                6.375%, 2/15/11                         291,396
                                                               -----------------

                                                                      2,052,038
                                                               -----------------

CHEMICALS & RESINS -- 0.6%

                   300,000  ARCO Chemical Co., 10.25%,
                                11/1/10                                 400,599
                                                               -----------------

COMMUNICATIONS SERVICES -- 4.0%

                   350,000  Ameritech Capital Funding, 6.15%,
                                1/15/08                                 347,928

                   350,000  Cable & Wireless Communications,
                                6.625%, 3/6/05                          352,191

                   400,000  TCI Communications, Inc., 6.375%,
                                9/15/99                                 400,552

                   500,000  TKR Cable Inc., 10.50%,
                                10/30/99                                552,445

                   500,000  WorldCom Inc., 8.875%, 1/15/01              545,000

                   500,000  WorldCom Inc., 7.55%, 4/1/04                525,970
                                                               -----------------

                                                                      2,724,086
                                                               -----------------

See Notes to Financial Statements


ANNUAL REPORT                               SCHEDULE OF INVESTMENTS       9


                            SCHEDULE OF INVESTMENTS

MARCH 31, 1998

Principal Amount                                                       Value
- --------------------------------------------------------------------------------

ELECTRICAL & ELECTRONIC COMPONENTS -- 1.0%

               $   200,000  Anixter International Inc., 8.00%,
                                9/15/03                           $     211,604

                   500,000  Yorkshire Power Finance, 6.15%,
                                2/25/03 (Acquired 2/19/98,
                                Cost $500,000)(3)                       496,925
                                                               -----------------

                                                                        708,529
                                                               -----------------

ENERGY (PRODUCTION & MARKETING) -- 1.7%

                   750,000  Enron Corp., 6.625%, 11/15/05               759,075

                   400,000  Seagull Energy Corp., 7.50%,
                                9/15/27                                 415,068
                                                               -----------------

                                                                      1,174,143
                                                               -----------------

FINANCIAL SERVICES -- 4.4%

                   400,000  Advanta Corp., MTN, Series B,
                                7.00%, 5/1/01                           383,796

                   500,000  Associates Corp., N.A., 6.625%,
                                6/15/05                                 510,095

                   400,000  Dean Witter, Discover & Co.,
                                6.875%, 3/1/03                          411,080

                   200,000  Ford Motor Credit Co., 6.75%,
                                5/15/05                                 204,848

                   550,000  Lehman Brothers Holdings Inc.,
                                6.625%, 11/15/00                        555,385

                   250,000  Lehman Brothers Holdings Inc., 
                                MTN, Series 1998 E, 6.00%,
                                2/26/01                                 248,023

                   300,000  Paine Webber Group Inc., 7.875%,
                                2/15/03                                 317,193

                   400,000  Wharf International Finance Ltd.,
                                7.625%, 3/13/07                         358,532
                                                               -----------------

                                                                      2,988,952
                                                               -----------------

INSURANCE -- 0.7%

                   450,000  Zurich Capital Trust I, 8.38%,
                                6/1/37 (Acquired
                                5/28/97 through 6/11/97, Cost
                                $452,966)(3)                            491,576
                                                               -----------------

LEISURE -- 0.5%

                   350,000  Hilton Hotels Corp., 7.00%,
                                7/15/04                                 353,301
                                                               -----------------

MACHINERY & EQUIPMENT -- 0.5%

                   300,000  Time Warner Inc., 6.85%,
                                1/15/26                                 311,184
                                                               -----------------


Principal Amount                                                       Value
- --------------------------------------------------------------------------------

MEDICAL EQUIPMENT & SUPPLIES -- 0.7%

               $   450,000  United States Surgical Corp.,
                                7.25%, 3/15/08                    $     450,288
                                                               -----------------

METALS & MINING -- 0.9%

                   600,000  Barrick Gold Corp., 7.50%,
                                5/1/07                                  633,876
                                                               -----------------

OFFICE EQUIPMENT & SUPPLIES -- 0.6%

                   350,000  Xerox Capital Trust, 8.00%,
                                2/1/27 (Acquired 7/17/97,
                                Cost $364,084)(3)                       371,774
                                                               -----------------

PRINTING & PUBLISHING -- 0.4%

                   250,000  News America Inc., 6.625%,
                                1/9/08 (Acquired 2/12/98,
                                Cost $248,938)(3)                       247,230
                                                               -----------------

RAILROAD -- 0.6%

                   350,000  Norfolk Southern Corp., 7.90%,
                                5/15/97                                 397,173
                                                               -----------------

REAL ESTATE -- 2.2%

                   500,000  Chelsea GCA Realty Partners,
                                7.25%, 10/21/07                         510,315

                   450,000  Price REIT, Inc. (The), 7.25%,
                                11/1/00                                 458,604

                   500,000  Spieker Properties, Inc., 6.80%,
                                12/15/01                                509,060
                                                               -----------------

                                                                      1,477,979
                                                               -----------------

RETAIL (GENERAL MERCHANDISE) -- 0.6%

                   300,000  Sears, Roebuck & Co., Inc.,
                                9.375%, 11/1/11                         373,872
                                                               -----------------

TOBACCO -- 0.4%

                   250,000  Philip Morris Companies Inc.,
                                7.00%, 7/15/05                          256,252
                                                               -----------------

UTILITIES -- 1.9%

                   350,000  CalEnergy Co. Inc., 7.63%,
                                10/15/07                                350,921

                   500,000  Columbia Gas System, Inc. (The),
                                6.80%, 11/28/05                         512,500

                   400,000  Duke Power Co., 6.875%, 8/1/23              394,520
                                                               -----------------

                                                                      1,257,941
                                                               -----------------

TOTAL CORPORATE BONDS -- 25.9%                                       17,518,086
                                                               -----------------
   (Cost $17,203,901)

See Notes to Financial Statements


10      SCHEDULE OF INVESTMENTS                AMERICAN CENTURY INVESTMENTS


                            SCHEDULE OF INVESTMENTS

MARCH 31, 1998

Principal Amount                                                       Value
- --------------------------------------------------------------------------------

SOVEREIGN GOVERNMENTS & AGENCIES -- 0.9%

                $  500,000  Hydro-Quebec, 8.05%, 7/7/24           $     580,050
                                                               -----------------
   (Cost $540,931)

MUNICIPAL OBLIGATION -- 2.8%

                 2,000,000  Massachusetts Water Resource
                                Auth. Rev., Series 1993 C,
                                4.75%, 12/1/23 (MBIA)                 1,867,760
                                                               -----------------
   (Cost $1,857,202)

TEMPORARY CASH INVESTMENTS

Repurchase Agreement, Goldman Sachs & Co.,
    Inc., (U.S. Treasury obligations), in a joint
    trading account at 5.65%, dated 3/31/98,
    due 4/1/98 (Delivery value $1,503,236)                            1,503,000

Repurchase Agreement, Merrill Lynch & Co., Inc.,
    (U.S. Treasury obligations), in a joint trading
    account at 5.90%, dated 3/31/98, due
    4/1/98 (Delivery value $3,191,523)                                3,191,000
                                                              ------------------

TOTAL TEMPORARY
CASH INVESTMENTS -- 7.0%                                              4,694,000
                                                              ------------------
   (Cost $4,694,000)

TOTAL INVESTMENT SECURITIES -- 100.0%                               $67,537,693
                                                              ==================
   (Cost $66,270,265)

NOTES TO SCHEDULE OF INVESTMENTS

FHLMC = Federal Home Loan Mortgage Corporation

FNMA = Federal National Mortgage Association

GNMA = Government National Mortgage Association

LIBOR = London Interbank Offered Rate

MBIA = MBIA Insurance Corp.

MTN = Medium Term Note

VRN   =  Variable  Rate  Note.  Interest  reset  date is  indicated  and used in
      calculating the weighted average portfolio maturity. Coupon rate indicated
      is effective March 31, 1998.

resets= The  frequency  with which a  fixed-income  security's  coupon  changes,
      based on  current  market  conditions  or an  underlying  index.  The more
      frequently  a security  resets,  the less risk the investor is taking that
      the coupon will vary significantly from current market rates.

(1)   Security,  or a  portion  thereof,  has been  segregated  for the  forward
      commitments.

(2)   Final maturity indicated. Expected remaining maturity used for purposes of
      calculating the weighted average portfolio maturity.

(3)   Security was purchased  under Rule 144A or section 4(2) of the  Securities
      Act of  1933  and,  unless  registered  under  the  Act or  exempted  from
      registration,  may only be sold to qualified institutional  investors. The
      aggregate   value  of  restricted   securities  at  March  31,  1998,  was
      $2,012,567, which represented 3.1% of net assets.

See Notes to Financial Statements


ANNUAL REPORT                               SCHEDULE OF INVESTMENTS       11


                      STATEMENT OF ASSETS AND LIABILITIES

MARCH 31, 1998

ASSETS

Investment securities, at value
  (identified cost of $66,270,265)
  (Note 3) ...............................................           $67,537,693

Cash .....................................................                   916

Receivable for capital shares sold .......................             1,071,222

Interest receivable ......................................               713,494
                                                                     -----------
                                                                      69,323,325
                                                                     -----------
LIABILITIES

Disbursements in excess
  of demand deposit cash .................................                   539

Payable for investments purchased ........................             4,084,042

Payable for capital shares redeemed ......................                 1,300

Accrued management fees (Note 2) .........................                24,390

Dividends payable ........................................                41,914
                                                                     -----------
                                                                       4,152,185
                                                                     -----------
Net Assets ...............................................           $65,171,140
                                                                     ===========
CAPITAL SHARES, $0.01 PAR VALUE

Authorized ...............................................            100,000,00
                                                                     ===========
Outstanding ..............................................             6,418,885
                                                                     ===========
Net Asset Value Per Share ................................           $     10.15
                                                                     ===========
NET ASSETS CONSIST OF:

Capital (par value and paid-in surplus) ..................            $63,501,81

Undistributed net investment income ......................                21,897

Accumulated undistributed net
  realized gain on investments ...........................               380,005

Net unrealized appreciation on
  investments (Note 3) ...................................             1,267,428
                                                                     -----------
                                                                     $65,171,140
                                                                     ===========

See Notes to Financial Statements


12     STATEMENT OF ASSETS AND LIABILITIES     AMERICAN CENTURY INVESTMENTS


                            STATEMENT OF OPERATIONS

YEAR ENDED MARCH 31, 1998

INVESTMENT INCOME

Income:

Interest ................................................             $3,729,929
                                                                      ----------
Expenses (Note 2):

Management fees .........................................                258,139

Directors' fees and expenses ............................                    541
                                                                      ----------
                                                                         258,680
                                                                      ----------
Net investment income ...................................              3,471,249
                                                                      ----------
REALIZED AND UNREALIZED
GAIN ON INVESTMENTS (NOTE 3)

Net realized gain on investments ........................                817,782

Change in net unrealized
  appreciation on investments ...........................              1,701,053
                                                                      ----------
Net realized and unrealized
  gain on investments ...................................              2,518,835
                                                                      ----------
Net Increase in Net Assets
  Resulting from Operations .............................             $5,990,084
                                                                      ==========

See Notes to Financial Statements


ANNUAL REPORT                               STATEMENT OF OPERATIONS       13


                      STATEMENTS OF CHANGES IN NET ASSETS

YEARS ENDED MARCH 31, 1998
AND MARCH 31, 1997

Increase in Net Assets                              1998               1997

OPERATIONS

Net investment income ..................       $  3,471,249        $  1,269,694

Net realized gain (loss)
  on investments .......................            817,782              (7,433)

Change in net unrealized
  appreciation (depreciation)
  on investments .......................          1,701,053            (393,769)
                                               ------------        ------------
Net increase in net assets
  resulting from operations ............          5,990,084             868,492
                                               ------------        ------------
DISTRIBUTIONS TO
SHAREHOLDERS

From net investment income .............         (3,471,249)         (1,269,694)

From net realized gains from
   investment transactions .............           (387,844)               --
                                               ------------        ------------
Decrease in net assets
  from distributions ...................         (3,859,093)         (1,269,694)
                                               ------------        ------------
CAPITAL SHARE TRANSACTIONS

Proceeds from shares sold ..............         72,857,318           7,964,953

Proceeds from reinvestment
  of distributions .....................          3,796,289           1,246,658

Payments for shares redeemed ...........        (35,363,449)         (7,339,935)
                                               ------------        ------------
Net increase in net assets
  from capital share transactions ......         41,290,158           1,871,676
                                               ------------        ------------
Net increase in net assets .............         43,421,149           1,470,474

NET ASSETS

Beginning of year ......................         21,749,991          20,279,517
                                               ------------        ------------
End of year ............................       $ 65,171,140        $ 21,749,991
                                               ============        ============
Undistributed net
  investment income ....................       $     21,897                --
                                               ============        ============
TRANSACTIONS IN SHARES
OF THE FUNDS

Sold ...................................          7,303,108             805,036

Issued in reinvestment
  of distributions .....................            376,344             126,431

Redeemed ...............................         (3,489,976)           (743,472)
                                               ------------        ------------
Net increase ...........................          4,189,476             187,995
                                               ============        ============
See Notes to Financial Statements


14      STATEMENTS OF CHANGES IN NET ASSETS    AMERICAN CENTURY INVESTMENTS


                         NOTES TO FINANCIAL STATEMENTS

MARCH 31, 1998

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    ORGANIZATION -- American Century Premium Reserves, Inc. (the Corporation) is
registered under the Investment  Company Act of 1940 as an open-end  diversified
management  investment  company.  American  Century - Benham  Premium  Bond Fund
(Premium  Bond)  is  one of the  three  funds  issued  by the  Corporation.  The
investment  objective  of Premium  Bond is to obtain a high level of income from
investments in a portfolio of longer-term bonds and other debt obligations.  The
following  significant  accounting  policies,   related  to  the  Fund,  are  in
accordance with accounting policies generally accepted in the investment company
industry.

    SECURITY  VALUATIONS -- Securities are valued  through a commercial  pricing
service or at the mean of the most recent bid and asked prices.  When valuations
are not readily available,  securities are valued at fair value as determined in
accordance with procedures adopted by the Board of Directors.

    SECURITY TRANSACTIONS -- Security transactions are accounted for on the date
purchased  or  sold.  Net  realized  gains  and  losses  are  determined  on the
identified cost basis, which is also used for federal income tax purposes.

    INVESTMENT  INCOME -- Interest  income is recorded on the accrual  basis and
includes accretion of discounts and amortization of premiums.

    FORWARD  COMMITMENTS  -- The Fund may  purchase  and  sell  U.S.  government
securities on a firm commitment basis. Under these arrangements, the securities'
prices and  yields  are fixed on the date of the  commitment,  but  payment  and
delivery are scheduled  for a future date.  During this period,  securities  are
subject  to  market   fluctuations.   The  Fund  maintains  segregated  accounts
consisting  of cash or liquid  securities  in an amount  sufficient  to meet the
purchase price.

    REPURCHASE  AGREEMENTS -- The Fund may enter into repurchase agreements with
institutions that the Fund's  investment  manager,  American Century  Investment
Management,  Inc. (ACIM),  has determined are creditworthy  pursuant to criteria
adopted by the Board of  Directors.  Each  repurchase  agreement  is recorded at
cost. The Fund requires that the collateral, represented by securities, received
in a  repurchase  transaction  be  transferred  to  the  custodian  in a  manner
sufficient  to enable  the Fund to  obtain  those  securities  in the event of a
default under the repurchase  agreement.  ACIM monitors,  on a daily basis,  the
securities  transferred to ensure the value,  including accrued interest, of the
securities  under each repurchase  agreement is equal to or greater than amounts
owed to the Fund under each repurchase agreement.

    JOINT  TRADING  ACCOUNT --  Pursuant  to an  Exemptive  Order  issued by the
Securities  and  Exchange  Commission,  the Fund,  along with  other  registered
investment  companies  having  management  agreements  with ACIM,  may  transfer
uninvested  cash  balances  into a joint  trading  account  held  at the  Fund's
custodian. These balances are invested in one or more repurchase agreements that
are collateralized by U.S. Treasury or Agency obligations.

    INCOME  TAX  STATUS  -- It is  the  Fund's  policy  to  distribute  all  net
investment  income  and  net  realized  capital  gains  to  shareholders  and to
otherwise qualify as a regulated  investment company under the provisions of the
Internal  Revenue Code.  Accordingly,  no provision has been made for federal or
state income taxes.

    DISTRIBUTIONS  TO SHAREHOLDERS -- Distributions  from net investment  income
are declared  daily and  distributed  monthly.  Distributions  from net realized
gains are declared and paid annually.

    The  character  of  distributions  made during the year from net  investment
income or net realized gains may differ from their ultimate characterization for
federal income tax purposes.  These differences  reflect the differing character
of certain income items and net capital gains and losses for financial statement
and tax  purposes  and may  result in  reclassification  among  certain  capital
accounts.

    USE OF ESTIMATES -- The  preparation  of financial  statements in conformity
with  generally  accepted  accounting  principles  requires  management  to make
estimates  and  assumptions  that  affect  the  reported  amounts  of assets and
liabilities  and disclosure of contingent  assets and liabilities at the date of
the financial  statements and the reported amounts of increases and decreases in
net assets from operations  during the period.  Actual results could differ from
these estimates.

    ADDITIONAL  INFORMATION -- Effective  January 15, 1998,  Funds  Distributor,
Inc. (FDI) became the  Corporation's  distributor.  Certain  officers of FDI are
also officers of the Corporation.


ANNUAL REPORT                         NOTES TO FINANCIAL STATEMENTS       15


                         NOTES TO FINANCIAL STATEMENTS

MARCH 31, 1998
- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

    The  Corporation  has entered  into a  Management  Agreement  with ACIM that
provides the Fund with investment  advisory and management  services in exchange
for a single,  unified  management fee. The Agreement provides that all expenses
of the Fund, except brokerage commissions,  taxes,  interest,  expenses of those
directors  who  are  not  considered  "interested  persons"  as  defined  in the
Investment  Company  Act of 1940  (including  counsel  fees)  and  extraordinary
expenses, will be paid by ACIM. The fee is computed daily and paid monthly based
on the Fund's  average daily closing net assets during the previous  month.  The
annual management fee for the Fund is 0.45%.

    Certain  officers and directors of the  Corporation are also officers and/or
directors,  and,  as a  group,  controlling  stockholders  of  American  Century
Companies,  Inc., the parent of the Corporation's  investment manager, ACIM, the
Corporation's  transfer agent,  American Century Services  Corporation,  and the
registered broker-dealer, American Century Investment Services, Inc.

- --------------------------------------------------------------------------------
3. INVESTMENT TRANSACTIONS

    Purchases  of  investment  securities,   excluding  short-term  investments,
totaled  $112,762,209,  including U.S. Treasury and Agency obligations  totaling
$94,862,365.  Sales of investment securities,  excluding short-term investments,
totaled  $73,627,005,  including U.S. Treasury and Agency  obligations  totaling
$71,102,376.

     As  of  March  31,  1998,  accumulated  net  unrealized   appreciation  was
$1,259,064,  based on the aggregate cost of  investments  for federal income tax
purposes  of  $66,278,629,   which  consisted  of  unrealized   appreciation  of
$1,358,015 and unrealized depreciation of $98,951.


16      NOTES TO FINANCIAL STATEMENTS          AMERICAN CENTURY INVESTMENTS


<TABLE>
<CAPTION>
                             FINANCIAL HIGHLIGHTS

                    For a Share Outstanding Throughout the Years Ended March 31

                                        1998             1997             1996             1995             1994
PER-SHARE DATA

Net Asset Value,
<S>                               <C>              <C>              <C>              <C>              <C>       
Beginning of Year ...........     $     9.76       $     9.93       $     9.46       $     9.64       $    10.00
                                  ----------       ----------       ----------       ----------       ----------
Income From Investment
  Operations

  Net Investment Income .....           0.61             0.61             0.61             0.59             0.46

  Net Realized and Unrealized
  Gain (Loss) on Investments            0.45            (0.17)            0.47            (0.18)           (0.36)
                                  ----------       ----------       ----------       ----------       ----------
  Total From Investment
  Operations ................           1.06             0.44             1.08             0.41             0.10
                                  ----------       ----------       ----------       ----------       ----------
Distributions

  From Net Investment Income           (0.61)           (0.61)           (0.61)           (0.59)           (0.46)

  From Net Realized
  Capital Gains .............          (0.06)            --               --               --               --
                                  ----------       ----------       ----------       ----------       ----------
  Total Distributions .......          (0.67)           (0.61)           (0.61)           (0.59)           (0.46)
                                  ----------       ----------       ----------       ----------       ----------
Net Asset Value, End of Year      $    10.15       $     9.76       $     9.93       $     9.46       $     9.64
                                  ==========       ==========       ==========       ==========       ==========
  Total Return(1) ...........          11.14%            4.57%           11.53%            4.48%            0.92%

RATIOS/SUPPLEMENTAL DATA

Ratio of Operating Expenses
to Average Net Assets .......           0.45%            0.45%            0.43%            0.45%            0.45%

Ratio of Net Investment
  Income to Average
  Net Assets ................           6.06%            6.20%            6.08%            6.30%            4.65%

Portfolio Turnover ..........            138%              63%              92%              51%             144%

Net Assets, End
of Period (in thousands) ....     $   65,171       $   21,750       $   20,280       $   10,334       $    8,080

(1)  Total  return   assumes   reinvestment   of  dividends  and  capital  gains
     distributions, if any.
</TABLE>

See Notes to Financial Statements


ANNUAL REPORT                                  FINANCIAL HIGHLIGHTS       17


                         INDEPENDENT AUDITORS' REPORT

The Board of Directors and Shareholders,
American Century Premium Reserves, Inc.:

  We  have  audited  the  accompanying  statement  of  assets  and  liabilities,
including the schedule of investments, of American Century - Benham Premium Bond
Fund  (the  "Fund"),  one of  the  funds  comprising  American  Century  Premium
Reserves,  Inc., as of March 31, 1998, and the related  statements of operations
and changes in net assets for the year then ended, and the financial  highlights
for the year then ended. These financial statements and the financial highlights
are the  responsibility  of the  Fund's  management.  Our  responsibility  is to
express an opinion on these  financial  statements and the financial  highlights
based on our audit. The financial statements and the financial highlights of the
Fund for each of the years in the  four-year  period  ended  March 31, 1997 were
audited by other  auditors  whose  report,  dated April 25,  1997,  expressed an
unqualified opinion on those statements and financial highlights.

  We  conducted  our  audit  in  accordance  with  generally  accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable  assurance  about whether the financial  statements and the financial
highlights are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements.  Our procedures  included  confirmation of securities owned at March
31,  1998 by  correspondence  with the  custodian  and  brokers.  An audit  also
includes assessing the accounting principles used and significant estimates made
by  management,   as  well  as  evaluating  the  overall   financial   statement
presentation.  We believe  that our audit  provides a  reasonable  basis for our
opinion.

  In our opinion,  such financial  statements and financial  highlights  present
fairly, in all material  respects,  the financial position of American Century -
Benham  Premium Bond Fund as of March 31, 1998,  the results of its  operations,
the changes in its net assets,  and the financial  highlights  for the year then
ended in conformity with generally accepted accounting principles.

Deloitte & Touche LLP
Kansas City, Missouri
April 30, 1998


18      INDEPENDENT AUDITORS' REPORT           AMERICAN CENTURY INVESTMENTS


                        RETIREMENT ACCOUNT INFORMATION

    As required by law,  any  distributions  you receive from an IRA and certain
403(b)  distributions [not eligible for rollover to an IRA or to another 403(b)]
are subject to federal  income tax  withholding  at the rate of 10% of the total
amount withdrawn,  unless you elect not to have withholding  apply. If you don't
want us to withhold on this amount, you may send us a written notice not to have
the federal  income tax  withheld.  Your written  notice is valid for six months
from the date of receipt at American Century.  Even if you plan to roll over the
amount you withdraw to another tax-deferred  account, the withholding rate still
applies to the withdrawn  amount unless we have received a written notice not to
withhold federal income tax within six months prior to the withdrawal.

    When you plan to  withdraw,  you may make your  election by  completing  our
Exchange/  Redemption form or an IRS Form W-4P. Call American Century for either
form.  Your  written  election  is valid  for only six  months  from the date of
receipt at American Century. You may revoke your election at any time by sending
a written notice to us.

    Remember,  even if you elect not to have income tax withheld, you are liable
for paying income tax on the taxable  portion of your  withdrawal.  If you elect
not to have income tax  withheld or you don't have enough  income tax  withheld,
you may be  responsible  for payment of estimated  tax. You may incur  penalties
under the estimated tax rules if your withholding and estimated tax payments are
not sufficient.


ANNUAL REPORT                        RETIREMENT ACCOUNT INFORMATION       19


                            BACKGROUND INFORMATION

INVESTMENT PHILOSOPHY & POLICIES

    The Benham Group  offers 39  fixed-income  funds,  ranging from money market
funds to long-term bond funds and including  both taxable and tax-exempt  funds.
Each fund is  managed  to  provide  a "pure  play" on a  specific  sector of the
fixed-income market. To ensure adherence to this principle,  the basic structure
of each fund's  portfolio  is tied to a specific  market  index.  Fund  managers
attempt  to add  value by making  modest  portfolio  adjustments  based on their
analysis of  prevailing  market  conditions.  Investment  decisions  are made by
management teams, which meet regularly to discuss market analysis and investment
strategies.

    PREMIUM  BOND seeks a high level of income from  investment  in  longer-term
bonds and other debt  instruments.  It is designed for  investors  whose primary
goal is a level of income  higher than is generally  provided by money market or
short- and intermediate-term securities and who can accept the generally greater
price volatility associated with longer-term bonds.

COMPARATIVE INDICES

    The following index is used in the report for fund performance  comparisons.
It is not an investment product available for purchase.

    The   LEHMAN    AGGREGATE   BOND   INDEX   is   composed   of   the   Lehman
Government/Corporate  Index and the Lehman Mortgage-Backed  Securities Index. It
reflects the price fluctuations of Treasury  securities,  U.S. government agency
securities, corporate bond issues and mortgage-backed securities.

LIPPER RANKINGS

    LIPPER  ANALYTICAL  SERVICES,  INC. is an  independent  mutual fund  ranking
service that groups funds according to their investment objectives. Rankings are
based on  average  annual  returns  for each  fund in a given  category  for the
periods indicated. Rankings are not included for periods less than one year.

    The Lipper category for Premium Bond is:

    CORPORATE  DEBT  FUNDS  RATED A  --funds  that  invest at least 65% of their
assets in government issues or corporate debt issues rated A or better.

- --------------------------------------------------------------------------------
INVESTMENT TEAM LEADERS
- --------------------------------------------------------------------------------
   Portfolio Managers           Bud Hoops, Jeff Houston
   Credit Research Manager      Greg Afiesh
- --------------------------------------------------------------------------------

20      BACKGROUND INFORMATION                 AMERICAN CENTURY INVESTMENTS


                                   GLOSSARY

RETURNS

* TOTAL  RETURN  figures  show the overall  percentage  change in the value of a
hypothetical  investment  in  the  fund  and  assume  that  all  of  the  fund's
distributions are reinvested.

* AVERAGE ANNUAL RETURNS  illustrate the annually  compounded returns that would
have produced the fund's cumulative total returns if the fund's  performance had
been  constant  over the  entire  period.  Average  annual  returns  smooth  out
variations  in a fund's  return;  they are not the same as  fiscal  year-by-year
results.  For  fiscal  year-by-year  returns,  please  refer  to the  "Financial
Highlights" on page 17.

YIELDS

* 30-DAY SEC YIELD  represents net  investment  income earned by the fund over a
30-day period,  expressed as an annual percentage rate based on the fund's share
price at the end of the 30-day  period.  The SEC yield  should be regarded as an
estimate  of the  fund's  rate of  investment  income,  and it may not equal the
fund's  actual  income  distribution  rate,  the income paid to a  shareholder's
account, or the income reported in the fund's financial statements.

PORTFOLIO STATISTICS

* NUMBER OF SECURITIES--the  number of different  securities held by a fund on a
given date.

*  WEIGHTED  AVERAGE   MATURITY   (WAM)--a  measure  of  the  sensitivity  of  a
fixed-income  portfolio to interest rate changes. WAM indicates the average time
until the securities in the portfolio  mature,  weighted by dollar  amount.  The
longer the WAM, the more interest rate  exposure and  sensitivity  the portfolio
has.

*  AVERAGE  DURATION--another  measure  of  the  sensitivity  of a  fixed-income
portfolio to interest rate changes.  Duration is a time-weighted  average of the
interest  and  principal  payments  of the  securities  in a  portfolio.  As the
duration  of a portfolio  increases,  so does the impact of a change in interest
rates on the value of the portfolio.

* EXPENSE RATIO--the  operating expenses of the fund,  expressed as a percentage
of average net assets.  Shareholders pay an annual fee to the investment manager
for  investment  advisory  and  management  services.  The expenses and fees are
deducted from fund income, not from each shareholder account. (See Note 2 in the
Notes to Financial Statements.)

TYPES OF FIXED-INCOME SECURITIES

* ASSET-BACKED SECURITIES--debt securities that represent ownership in a pool of
assets, such as credit card debt, auto loans or home equity loans.

* CORPORATE  BONDS--debt  securities  or  instruments  issued by  companies  and
corporations.

* MORTGAGE-BACKED  SECURITIES--debt securities that represent ownership in pools
of mortgage loans.

* U.S. GOVERNMENT AGENCY  SECURITIES--debt  securities issued by U.S. government
agencies  (such as the Federal Home Loan Bank and the Federal Farm Credit Bank).
Government  agency  securities  include  discount notes (maturing in one year or
less) and medium-term  notes,  debentures and bonds (maturing in three months to
50 years).

* U.S.  TREASURY  SECURITIES--debt  securities  issued by the U.S.  Treasury and
backed by the direct  "full  faith and  credit"  pledge of the U.S.  government.
Treasury  securities  include  bills  (maturing  in one  year  or  less),  notes
(maturing in two to 10 years) and bonds (maturing in more than 10 years).


ANNUAL REPORT                                              GLOSSARY       21

[american century logo(reg. sm)]
            American            
        Century(reg.tm)

P.O. BOX 419200
KANSAS CITY, MISSOURI
64141-6200

INVESTOR SERVICES:
1-800-345-2021 OR 816-531-5575

AUTOMATED INFORMATION LINE:
1-800-345-8765

TELECOMMUNICATIONS DEVICE FOR THE DEAF:
1-800-634-4113 OR 816-444-3485

FAX: 816-340-7962

INTERNET: WWW.AMERICANCENTURY.COM

AMERICAN CENTURY PREMIUM RESERVES, INC.

INVESTMENT MANAGER
AMERICAN CENTURY INVESTMENT MANAGEMENT, INC.
KANSAS CITY, MISSOURI

THIS REPORT AND THE STATEMENTS IT CONTAINS ARE SUBMITTED FOR THE GENERAL
INFORMATION OF OUR SHAREHOLDERS. THE REPORT IS NOT AUTHORIZED FOR DISTRIBUTION
TO PROSPECTIVE INVESTORS UNLESS PRECEDED OR ACCOMPANIED BY AN EFFECTIVE
PROSPECTUS.

(c) 1998 AMERICAN CENTURY SERVICES CORPORATION
FUNDS DISTRIBUTOR, INC.

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