AMERICAN CENTURY MUNICIPAL TRUST
N-30D, 1999-07-27
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[front cover]
                                                                    MAY 31, 1999

ANNUAL REPORT
- -----------------
AMERICAN CENTURY

    [graphic of stairs]

- --------------------------
ARIZONA INTERMEDIATE-TERM
MUNICIPAL

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


[inside front cover]


Y2K TESTING EFFORTS PAY  DIVIDENDS IN PREPAREDNESS
- --------------------------------------------------------------------------------

Y2K, short for the year 2000,  refers more  specifically to the date change from
December  31,  1999 to January  1, 2000.  This date  change is  significant  for
computers  because  many  were  originally  programmed  to  process  dates  with
two-character years -- 99 instead of 1999.

When the  calendar  rolls  to  2000,  this can  create  problems  for  computers
programmed  this way because they will read the date as "00," and may  interpret
it as 1900. Most companies have been working to reprogram their computer systems
with  four-digit  years.  Reprogramming  is very  labor-intensive  and  requires
testing  to ensure  that  there  are no  errors  and that all lines of code were
successfully changed.

Recognizing  the possible  impact of the Y2K issue,  our  senior-level  Steering
Committee,  programmers,  business  partners  and Y2K  team  have  been  working
diligently to make January 1, 2000 a non-event for American Century investors.

Currently,  all of our computer systems have been modified,  tested and returned
to  production.  We have an ongoing  commitment  to testing our systems with our
vendors and business partners and within the industry throughout the rest of the
year.

In March  and April of this  year,  we  participated  in the  Security  Industry
Association's (SIA) industry-wide test and successfully  processed  transactions
for dates up to and beyond 2000. American Century  transactions with our partner
firms were processed free of Y2K bugs. We also  participated  in the Market Data
Test conducted by the SIA and Financial  Information  Forum in May.  Again,  the
computer scripts were executed successfully with no Y2K-related errors.

In addition  to our testing  schedule,  our Y2K team has  developed  contingency
plans.  These  plans  will  minimize  the  impact on our  investors  and help us
maintain operations in the event of any Y2K-related  incidents.  We will conduct
practice  drills of  contingency  scenarios  during  the rest of 1999 and refine
those  plans to respond  quickly and  effectively  so that the date change is as
seamless as possible  for  investors.  We expect the year 2000 to be business as
usual at American Century.

Year 2000 Readiness Disclosure

[left margin]

ARIZONA INTERMEDIATE-TERM MUNICIPAL
(BEAMX)
- ------------------------------------

Turn to the inside back cover of this  report to see a list of American  Century
funds classified by objective and risk.

AN IMPORTANT MESSAGE

    On March 1, we reorganized our funds under the American Century name. Though
the  venerable  Benham  name is  gone,  your  funds  will  maintain  their  same
disciplined investment management approach.

    James Benham's proven  fixed-income  investment  philosophy,  which provides
investors  a "pure  play" on a sector  of the bond  market,  will  remain.  That
investment practice--now a hallmark of investing at American Century--has helped
our fixed-income funds deliver solid performance over the years.

    In addition, we will continue to build our team of experienced  fixed-income
portfolio managers, which has doubled in size since American Century was formed.

    We look forward to continuing to meet your fixed-income  investment needs in
the tradition you have come to expect.


Our Message to You
- --------------------------------------------------------------------------------
/photo of James E. Stowers III and James E. Stowers, Jr./
James E. Stowers III, seated, with James E. Stowers, Jr.

     We experienced several investment mood swings in the U.S. financial markets
during the year ended May 31, 1999. When we last addressed you in the semiannual
report for American  Century  Arizona  Intermediate-Term  Municipal,  yields had
fallen as the U.S.  bond market  rallied.  The bond gains were spurred by global
economic and financial turmoil.  The Federal Reserve (the U.S. central bank) cut
short-term  interest rates to bolster a seemingly  vulnerable  U.S.  economy and
help stabilize markets worldwide.

     The Fed's actions  helped turn things  around.  By January  1999,  overseas
economies were  stabilizing,  the U.S.  economy was posting  strong growth,  and
investor  confidence  had rebounded.  As a result,  stocks rallied and U.S. bond
yields generally returned to higher levels, though they remained lower than they
were a year earlier. Municipal bonds, which had underperformed Treasury bonds in
1998, outperformed Treasurys during the first five months of 1999.

     Investors in American  Century  tax-free and municipal funds benefited from
other positive  developments as 1999 unfolded. In March, we consolidated all our
funds under the American  Century  name.  We believe the change makes it simpler
for you to identify your funds.

     We also reclassified all 71 of our funds based on investment goals and risk
levels,  so you can more  easily  choose  the funds  that are  right for you.  A
complete list of American Century funds,  arranged by their new classifications,
is on the inside back cover of this report.

     In  addition,  we enhanced  our Web site  (www.americancentury.com).  There
you'll find daily fund  information -- including  performance  and price data --
market and national news,  and a Forms Center with access to the  most-requested
investor  forms  and  applications.  You  can  also  sign  up  to  receive  fund
prospectuses and shareholder reports electronically.

     Finally, we continued to expand the American Century investment team, which
has  doubled  over the  last  three  years.  We're  committed  to  building  and
maintaining a talented management group.

     As always, we appreciate your continued confidence in American Century.

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        Vice Chairman of the Board and
                                         Chief Executive Officer

[right margin]

               Table of Contents
   Report Highlights .......................................................   2
   Market Perspective ......................................................   3
   Municipal Credit Review .................................................   4
ARIZONA INTERMEDIATE-TERM MUNICIPAL
   Performance Information .................................................   5
   Management Q&A ..........................................................   6
   Yields ..................................................................   6
   Portfolio at a Glance ...................................................   6
   Top Five Sectors ........................................................   7
   Portfolio Composition
      by Credit Rating .....................................................   7
   Schedule of Investments .................................................   8
FINANCIAL STATEMENTS
   Statement of Assets and
      Liabilities ..........................................................  11
   Statement of Operations .................................................  12
   Statements of Changes
      in Net Assets ........................................................  13
   Notes to Financial
      Statements ...........................................................  14
   Financial Highlights ....................................................  16
   Report of Independent
      Accountants ..........................................................  17
OTHER INFORMATION
   Background Information
      Investment Philosophy
         and Policies ......................................................  18
      Comparative Indices ..................................................  18
      Lipper Rankings ......................................................  18
      Credit Rating
         Guidelines ........................................................  18
      Investment Team
         Leaders ...........................................................  18
   Glossary ................................................................  19


                                                  www.americancentury.com      1


Report Highlights
- --------------------------------------------------------------------------------

MARKET PERSPECTIVE

*   Municipal  bonds posted  positive  returns overall during the year ended May
    31, 1999,  though most of their gains  occurred in 1998 when interest  rates
    fell.

*   At the  beginning of last summer,  municipal  bonds  languished as investors
    worried that strong U.S. economic growth might ignite inflation.

*   In 1999,  better-than-expected  U.S.  economic growth and other  indications
    that higher  inflation and interest  rates might be ahead caused bond prices
    to retrace much of the ground they gained in 1998.

*   Despite that  environment,  municipal bonds benefited from decreased  supply
    and increased demand,  helping them to regain  considerable  ground on their
    Treasury counterparts.

ARIZONA MUNICIPAL CREDIT REVIEW

*   Municipal credit quality remained solid in Arizona during the year ended May
    31, 1999.

*   A growing jobs base, a burgeoning  population,  and personal  income  growth
    continued to be the mainstays of the state's credit strength.

*   Arizona's  employment growth slowed during 1998.  However,  the state's 4.7%
    jobs  expansion  was  still  the  highest  of any  state in the  U.S.,  even
    outpacing Nevada, which had held top honors since 1994.

*   Going  forward,  our overall  outlook for the state's  credit health remains
    generally upbeat.

MANAGEMENT Q&A

*   Arizona  Intermediate-Term  Municipal  finished  at the  top  of its  Lipper
    category for the year,  providing a respectable return in spite of the sharp
    rise in interest  rates in 1999.  The fund's  long-term  returns are equally
    impressive.

*   In addition to a solid  finish  among its peers,  Arizona  Intermediate-Term
    Municipal's  30-day SEC yield of 3.87% on May 31, 1999,  compared  favorably
    with the 3.47% average SEC yield of the fund's Lipper peers.

*   We think that  several  techniques,  such as careful  yield-curve  analysis,
    diligent  credit  research,  effective  duration  management,  and  maturity
    structure adjustments, helped us enhance returns.

*   Looking ahead, we will probably keep the portfolio's sensitivity to interest
    rate changes fairly neutral in light of the uncertain market environment. We
    also plan to concentrate our holdings in bonds maturing in the middle of the
    fund's maturity spectrum--the three- to 10-year area.

[left margin]

        ARIZONA INTERMEDIATE-TERM
            MUNICIPAL (BEAMX)
TOTAL RETURNS:              AS OF 5/31/99
   6 Months                         0.79%*
   1 Year                           4.51%
30-DAY SEC YIELD:                   3.87%
INCEPTION DATE:                   4/11/94
NET ASSETS:                 $45.4 million

* Not annualized.

Investment terms are defined in the Glossary on pages 19-20.


2      1-800-345-2021


Market Perspective from Randall W. Merk
- --------------------------------------------------------------------------------
/photo of Randall W. Merk/
Randall W. Merk, chief investment officer of fixed income

MUNICIPAL BOND PERFORMANCE

     Municipal bonds posted  positive  returns overall during the year ended May
31, 1999,  though most of their gains occurred in 1998 when interest rates fell.
In the first five months of 1999,  tax-free bond prices  generally  declined and
yields rose because of strong economic growth and inflation concerns.

     Short-  and  intermediate-term   municipal  bonds  outperformed   long-term
municipals,  which  are  more  sensitive  to  interest  rate  changes  (see  the
accompanying  bond index returns  table).  Also,  lower-quality  municipal bonds
(those rated BBB or lower) generally outperformed  higher-rated (A to AAA) bonds
as  strong  economic   conditions  caused  the  yield  gap  between  lower-  and
higher-rated bonds to narrow.

ECONOMIC ENGINE SPUTTERS BUT REGAINS POWER

     At the beginning of last summer,  municipal  bonds  languished as investors
worried  that strong U.S.  economic  growth might  ignite  inflation.  That view
changed radically in July 1998, when protracted  economic and financial problems
in Asia and Latin America  threatened to weaken global  economic  growth.  Bonds
rallied as recessionary  expectations  increased.  To stem overseas problems and
boost the U.S. economy, the Federal Reserve (the Fed) lowered short-term U.S.
interest rates three times last fall.

     Winter  brought  another  shift.  The Fed's actions seemed to achieve their
intended result--U.S. economic growth accelerated, while parts of Asia and Latin
America showed signs of stabilizing.  Better-than-expected  U.S. economic growth
and other indications that higher inflation might be ahead caused bond yields to
rise and prices to retrace  much of the ground they gained in 1998.  May brought
word that the Fed was leaning  toward  raising  interest  rates,  which  further
dampened bond investors' moods.

TREASURYS FALTER AS MUNICIPALS GAIN GROUND

     In 1998,  despite  falling  interest  rates,  municipals  were hamstrung by
unfavorable  supply and demand  conditions and lagged  Treasury  securities as a
result. By October,  the difference between municipal and Treasury yields was as
small as it had been in a decade, indicating that Treasury bonds were relatively
expensive and municipal bonds were comparatively undervalued.

     So far in 1999,  however,  municipal bonds benefited from decreased  supply
and  increased  demand,  helping  them to  regain  considerable  ground on their
Treasury  counterparts.  Even after  outperforming  Treasurys in recent  months,
municipal bonds continue to offer attractive  yields on a tax-equivalent  basis.
As of May 31, 1999, an investor in the highest  federal tax bracket could earn a
tax-adjusted  yield of nearly 7.4% on a 10-year  AAA-rated  municipal bond, well
above the 5.6% yield on a 10-Year U.S. Treasury bond.

[right margin]

"BETTER-THAN-EXPECTED U.S. ECONOMIC GROWTH AND OTHER INDICATIONS THAT HIGHER
INFLATION MIGHT BE AHEAD CAUSED BOND YIELDS TO RISE AND PRICES TO RETRACE MUCH
OF THE GROUND THEY GAINED IN 1998."

MUNICIPAL BOND INDEX RETURNS
FOR THE YEAR ENDED MAY 31, 1999
   MERRILL LYNCH 0- TO 3-YEAR
      MUNICIPAL INDEX               4.58%
   LEHMAN BROS. 5-YEAR
      MUNICIPAL GO INDEX            4.90%
   LEHMAN BROS. LONG-TERM
      MUNICIPAL BOND INDEX          4.35%

Source: Bloomberg Financial Markets

[line graph - data below]

SHIFTING MUNICIPAL YIELD CURVES

YEARS TO
MATURITY      5/31/98           11/30/98            5/31/99
1              3.80%              3.19%              3.36%
2              3.95%              3.49%              3.59%
3              4.06%              3.64%              3.80%
4              4.15%              3.76%              3.98%
5              4.20%              3.86%              4.12%
6              4.27%              3.96%              4.22%
7              4.34%              4.05%              4.31%
8              4.41%              4.13%              4.38%
9              4.48%              4.21%              4.46%
10             4.55%              4.29%              4.54%
11             4.62%              4.38%              4.62%
12             4.69%              4.47%              4.70%
13             4.77%              4.56%              4.78%
14             4.84%              4.65%              4.86%
15             4.92%              4.73%              4.95%
16             4.95%              4.77%              4.98%
17             4.98%              4.80%              5.01%
18             5.00%              4.84%              5.04%
19             5.03%              4.87%              5.08%
20             5.05%              4.91%              5.12%
21             5.05%              4.91%              5.12%
22             5.05%              4.91%              5.13%
23             5.05%              4.92%              5.14%
24             5.06%              4.92%              5.15%
25             5.06%              4.93%              5.16%
26             5.06%              4.93%              5.16%
27             5.06%              4.93%              5.16%
28             5.07%              4.94%              5.17%
29             5.07%              4.94%              5.17%
30             5.08%              4.95%              5.18%

Source: Bloomberg Financial Markets


                                                  www.americancentury.com      3


Municipal Credit Review
- --------------------------------------------------------------------------------

CREDIT SNAPSHOT

     Municipal  credit  quality  remained solid in Arizona during the year ended
May 31, 1999. A growing jobs base, a burgeoning population,  and personal income
growth continued to be the mainstays of the state's credit strength.

EMPLOYMENT GROWTH ROSE AT A MORE REASONABLE PACE . . .

     Arizona's  employment growth slowed during 1998. However,  the state's 4.7%
jobs  expansion was still the highest of any state in the U.S.,  even  outpacing
Nevada,  which  had  held top  honors  since  1994.  New  jobs in  Arizona  were
predominantly  service-related  ones and although  manufacturing  positions were
created, the industry's 1% growth in 1998 was far less than 1997's torrid 6%.

     Economic  turmoil in Asia,  the  destination  for roughly half of Arizona's
exports,  was the  catalyst  for the  slowdown.  With  demand  from the Far East
tapering off, cutbacks ensued at Phoenix's major semiconductor producers.  Asian
economies  are  showing  signs of  recovery  in  1999,  however,  enhancing  the
long-term outlook for the state's high-tech  industry.  Improvements in Mexico's
economy should also lead to increased  growth  opportunities  for Arizona in the
form of additional trade and tourism.

     Overall, job growth in 1999 is on track to continue slowing but remain well
above 3%,  which  should  allow  Arizona  to remain one of the  fastest  growing
employment spots in the nation.

 . . . AS ARIZONA'S POPULATION CONTINUED TO SWELL

     The state's  favorable  climate,  low housing costs,  and growing jobs base
attracted a net 116,000 new residents in 1998, and that figure is on track to be
even higher in 1999. Despite the swelling  population,  the state's unemployment
rate  continued to drop,  falling to only 4.1% in 1998--well  below the national
average. The unemployment rate remains on track to fall further still in 1999 as
labor  markets   continue  to  tighten.   Personal  incomes  also  continued  to
rise--income  growth  jumped 7% in 1998 and may  remain  over 6% in 1999.  Going
forward,  our overall  outlook for the state's credit health  remains  generally
upbeat.

ON THE LEGISLATIVE FRONT

     We have continued to monitor  developments  surrounding  the Students First
Act of 1998 (see the fund's May 31, 1998  annual  report for details on Students
First).  Though Arizona's  increased  financial  responsibilities  under the new
legislation are formidable,  solid economic growth and prudent fiscal management
should allow the initiative to succeed without  affecting the state's  long-term
stability. And while the Act reduces the pool of municipal securities from which
we can choose,  from a credit  standpoint,  Students  First has had little to no
discernable impact.

[left margin]

"A GROWING JOBS BASE, A BURGEONING POPULATION, AND PERSONAL INCOME GROWTH
CONTINUED TO BE THE MAINSTAYS OF THE STATE'S CREDIT STRENGTH."

MUNICIPAL CREDIT
RESEARCH TEAM
   MANAGER
      STEVEN PERMUT
   MUNICIPAL CREDIT ANALYSTS
      DAVID MOORE
      ROBERT MILLER
      BILL MCCLINTOCK
      TIM BENHAM
      BRAD BODE


4      1-800-345-2021


Arizona Intermediate-Term --Performance
- --------------------------------------------------------------------------------

<TABLE>
TOTAL RETURNS AS OF MAY 31, 1999
                   ARIZONA
                INTERMEDIATE-   LEHMAN 5-YEAR   OTHER STATES INTERM. MUNI. DEBT FUNDS(2)
                TERM MUNICIPAL    GO INDEX         AVERAGE RETURN    FUND'S RANKING
======================================================================================
<S>                 <C>           <C>                <C>                 <C>
6 MONTHS(1)         0.79%          1.42%               0.34%               --
1 YEAR              4.51%          4.90%               3.41%           1 OUT OF 80
======================================================================================
AVERAGE ANNUAL RETURNS
3 YEARS(3)          5.82%          5.97%               5.47%          15 OUT OF 62
5 YEARS(3)          5.92%          5.91%               5.35%           1 OUT OF 46
LIFE OF FUND(3)     6.17%         5.92%(4)            5.43%(4)        1 OUT OF 45(4)
</TABLE>

The fund's inception date was 4/11/94.

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

(2) According to Lipper Inc., an independent mutual fund ranking service.

(3) Returns and rankings  would have been lower if management  fees had not been
    waived.

(4) Since 4/30/94,  the date nearest the fund's  inception for which return data
    are available.

See pages 18-19 for more information about returns,  the comparative  index, and
Lipper fund rankings.

[mountain graph - data below]

GROWTH OF $10,000 OVER LIFE OF FUND
Value on 5/31/99
Arizona Intermediate-Term
   Municipal                   $13,457
Lehman 5-Year GO Index         $13,348

               Arizona Intermediate-    Lehman 5-Year
                  Term Municipal          GO Index
DATE                  VALUE                VALUE
4/30/94              $10,000              $10,000
6/30/94              $10,064               $9,996
9/30/94              $10,202              $10,077
12/31/94             $10,098              $10,044
3/31/95              $10,562              $10,450
6/30/95              $10,855              $10,717
9/30/95              $11,131              $11,010
12/31/95             $11,431              $11,211
3/31/96              $11,371              $11,246
6/30/96              $11,433              $11,295
9/30/96              $11,619              $11,479
12/31/96             $11,859              $11,730
3/31/97              $11,816              $11,711
6/30/97              $12,130              $12,002
9/30/97              $12,414              $12,264
12/31/97             $12,676              $12,490
3/31/98              $12,764              $12,636
6/30/98              $12,914              $12,764
9/30/98              $13,325              $13,115
12/31/98             $13,424              $13,218
3/31/99              $13,504              $13,354
5/31/99              $13,457              $13,348

$10,000 investment made 4/30/94

The graph at left shows the growth of a $10,000  investment over the life of the
fund,  while the graph  below  shows the fund's  year-by-year  performance.  The
Lehman  5-Year  GO Index is  provided  for  comparison  in each  graph.  Arizona
Intermediate-Term  Municipal's total returns include operating expenses (such as
transaction  costs and  management  fees) that reduce  returns,  while the total
returns of the index do not. 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.

[bar graph - data below]

ONE-YEAR RETURNS OVER LIFE OF FUND (PERIODS ENDING MAY 31)
              Arizona Intermediate-       Lehman 5-Year
                 Term Municipal             GO Index
DATE                 RETURN                  RETURN
5/31/94              0.92%                   0.56%
5/31/95              7.52%                   6.89%
5/31/96              4.65%                   4.74%
5/31/97              5.77%                   6.08%
5/31/98              7.19%                   6.95%
5/31/99              4.51%                   4.90%

* From 4/30/94 (the date nearest the fund's  inception  for which index data are
  available) to 5/31/94.


                                                  www.americancentury.com      5


Arizona Intermediate-Term--Q&A
- --------------------------------------------------------------------------------
/photo of Ken Salinger/

     An  interview  with  Ken  Salinger,  a  portfolio  manager  on the  Arizona
Intermediate-Term Municipal investment team.

HOW DID THE FUND PERFORM FOR THE FISCAL YEAR ENDED MAY 31, 1999?

     Arizona  Intermediate-Term  Municipal  finished  at the  top of its  Lipper
category for the year, providing a respectable return in spite of the sharp rise
in interest  rates in 1999.  The fund returned  4.51%,  outperforming  the 3.41%
average  return  of the 80 funds in  Lipper  Inc.'s  Other  States  Intermediate
Municipal Debt Funds category.

     Arizona  Intermediate-Term  Municipal's  five-year and life-of-fund returns
were also the  highest in its Lipper  group.  The fund's  benchmark,  the Lehman
5-Year GO Index, returned 4.90%. (See page 5 for fund performance comparisons.)

     In  addition,  Arizona  Intermediate-Term  Municipal's  30-day SEC yield of
3.87% on May 31, 1999,  compared  favorably  with the 3.47% average SEC yield of
the fund's Lipper peers.

WHY DID  ARIZONA  INTERMEDIATE-TERM  MUNICIPAL  FINISH AT THE TOP OF ITS  LIPPER
CATEGORY?

     We think that several  techniques,  such as careful  yield-curve  analysis,
diligent credit research, effective duration management, and maturity- structure
adjustments,  helped us enhance  returns.  Our careful analysis of the municipal
yield curve--a graphic  representation  of the relationship  between bond yields
and maturities (see page 3 for an  example)--helped  us target maturity areas of
the municipal market that seemed to offer the most attractive relative values.

     Then,  with the help of our  municipal  credit team,  we looked for what we
believed were undervalued securities within that maturity range. We made finding
such  securities a high priority  because they often enhance returns with little
or no additional risk.

HOW DID DURATION MANAGEMENT FACTOR IN?

     Controlling  the  portfolio's  sensitivity to interest rate changes through
effective  duration  management  proved  an  important   ingredient  in  Arizona
Intermediate-Term Municipal's continued success.

     During much of 1998, we  maintained a slightly long duration  compared with
the fund's  Lipper  peers,  a position of 5.4-5.8  years.  The fund  reached the
longer end of this range toward  year-end,  when our peers also  extended.  That
choice  enhanced   returns  because  the  portfolio's   greater   interest  rate
sensitivity  allowed  it to more  fully  benefit  from the  drop in  rates  that
occurred in 1998.

[left margin]

"ARIZONA INTERMEDIATE-TERM MUNICIPAL FINISHED AT THE TOP OF ITS LIPPER CATEGORY
FOR  THE YEAR, PROVIDING  A RESPECTABLE RETURN  IN SPITE OF THE SHARP RISE IN
INTEREST RATES  IN 1999."

YIELDS AS OF MAY 31, 1999
   30-DAY SEC YIELD                 3.87%
   30-DAY TAX-EQUIVALENT YIELDS
      31.02% TAX BRACKET            5.61%
      33.90% TAX BRACKET            5.85%
      34.59% TAX BRACKET            5.92%
      39.33% TAX BRACKET            6.38%

PORTFOLIO AT A GLANCE
                           5/31/99           5/31/98
NUMBER OF SECURITIES         53                42
WEIGHTED AVERAGE
MATURITY                   9.7 YRS           8.3 YRS
AVERAGE DURATION           5.6 YRS           5.3 YRS
EXPENSE RATIO               0.51%             0.54%

Investment terms are defined in the Glossary on pages 19-20.


6      1-800-345-2021


Arizona Intermediate-Term--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

     In 1999,  however, we have adopted a less aggressive stance. This has meant
shortening  duration  a bit to keep the fund  fairly  neutral to  slightly  long
compared with its peers.

WHAT PROMPTED THAT STRATEGY SHIFT?

     Inflation concerns, which have been driven by robust economic growth and an
apparent recovery in overseas markets. A recent rise in consumer prices prompted
the Federal  Reserve to raise its  short-term  interest  rate target by 25 basis
points  (0.25%--a  basis  point  equals  0.01%)  to slow  economic  growth  to a
more-sustainable, non-inflationary pace.

DO YOU EXPECT TO MAINTAIN THE PORTFOLIO'S SOMEWHAT  CONSERVATIVE DURATION IN THE
NEAR FUTURE?

     That depends on several factors.  Bond yields have risen to levels not seen
since before the Asian crisis worsened at the start of 1998, and Federal Reserve
actions are always tough to gauge.

     The bond  market  viewed the Fed's  June rate  increase  as a positive  and
rallied slightly on the news. The announcement  fueled expectations that the Fed
will  remain  vigilant on the  inflation  front.  The Fed's  switch to a neutral
stance toward rates in the wake of that  tightening,  rather than their previous
bias toward a rate increase, was also behind the rally.

     Despite that positive  event,  we've continued to see a wave of strength in
the  latest  economic  reports.  So  municipal  bond  yields  currently  reflect
expectations  that the Fed will raise its short-term  interest rate target again
before  1999 winds  down.  The big  question  on which the  municipal  market is
balancing  right now is whether  economic  growth will remain  overly strong and
spark additional Fed tightenings,  or whether those concerns are too bearish. If
economic growth remains robust,  the municipal  market may be in for more of the
kinds of  disappointing  returns  that we've seen so far this year.  By the same
token, though, if growth moderates or slows, the market's tone could become more
upbeat and bonds could rally.

WITH THAT OUTLOOK IN MIND, WHAT ARE YOUR PLANS FOR THE PORTFOLIO GOING FORWARD?

     Managing the maturity structure of the bonds in the portfolio, which helped
Arizona  Intermediate-Term  Municipal's returns during the period, will continue
to play a key role going forward. For now, that means keeping the portfolio more
highly  concentrated  in bonds  maturing  in the middle of the  fund's  maturity
spectrum--the  three- to 10-year area,  where supply is currently more plentiful
and prices more reasonable than for  longer-maturity  securities.  That somewhat
bulleted or targeted stance tends to perform best when the yield curve is moving
from flat to steep (short-term rates are falling faster than long-term rates, or
long-term rates are rising faster than short-term rates.)

     In addition,  we plan to continue to carefully  monitor the yield curve and
look  for  attractive  municipals  with  the  help  of our  credit  team,  while
conservatively adjusting the portfolio's duration in hopes of enhancing returns.

[right margin]

TOP FIVE SECTORS (AS OF 5/31/99)
                           % OF FUND INVESTMENTS
GO                                   51%
SALES TAX REVENUE                     7%
COPS/LEASES                           7%
HIGHER EDUCATION                      6%
SPECIAL TAX REVENUE                   6%

TOP FIVE SECTORS (AS OF 11/30/98)
                           % OF FUND INVESTMENTS
GO                                   54%
HOSPITAL REVENUE                      7%
COPS/LEASES                           7%
SPECIAL TAX REVENUE                   6%
WATER AND SEWER REVENUE               5%

PORTFOLIO COMPOSITION BY
CREDIT RATING
                           % OF FUND INVESTMENTS
                          AS OF             AS OF
                         5/31/99          11/30/98
AAA                        63%               60%
AA                         22%               26%
A                          10%                9%
BBB                         5%                5%

Ratings provided by Standard & Poor's.  See Credit Rating  Guidelines on page 18
for more information.


                                                  www.americancentury.com      7


Arizona Intermediate-Term--Sched. of Investments
- --------------------------------------------------------------------------------

MAY 31, 1999

Principal Amount                                                      Value
- --------------------------------------------------------------------------------
MUNICIPAL SECURITIES--98.9%
ARIZONA--93.5%
               $1,000,000  Arizona Transportation Board
                              Highway Rev., Series 1993 A,
                              6.00%, 7/1/08                        $ 1,110,470
                  655,000  Avondale Municipal Development
                              Corp. Rev., 4.60%, 7/1/10
                              (FGIC)                                   649,976
                  405,000  Avondale Municipal Development
                              Corp. Rev., 4.70%, 7/1/11
                              (FGIC)                                   402,145
                  900,000  Coconino & Yavapai Counties
                              Joint Unified School District
                              No. 9, Series 1994 C, (Sedona
                              Project of 1992), 5.60%,
                              7/1/06 (FGIC)                            947,268
                1,000,000  East Valley Institute of Technology
                              No. 401 GO, 5.00%, 7/1/03
                              (AMBAC)                                1,038,700
                  545,000  Gilbert County GO, Series
                              1994 C, 6.00%, 7/1/02 (MBIA)             578,250
                1,200,000  Glendale Industrial Development
                              Auth. Rev., Series 1998 A,
                              (Midwestern University), 5.375%,
                              5/15/28                                1,173,264
                1,370,000  Maricopa County COP, 5.625%,
                              6/1/00                                 1,384,330
                  500,000  Maricopa County GO, 6.25%,
                              7/1/03 (FGIC)                            542,150
                1,000,000  Maricopa County Hospital Rev.,
                              (Sun Health Corp.), 5.75%,
                              4/1/07                                 1,071,180
                  500,000  Maricopa County Industrial
                              Development Auth. Hospital
                              Facility Rev., (Samaritan Health
                              Services), 7.15%, 12/1/04
                              (MBIA)                                   569,600
                1,000,000  Maricopa County Unified School
                              District No. 1 GO, (Phoenix
                              Elementary), 5.50%, 7/1/09
                              (MBIA)                                 1,067,360
                1,000,000  Maricopa County Unified School
                              District No. 201 GO, Series
                              1992 E, (Phoenix), 7.10%,
                              7/1/04                                 1,134,290
                  575,000  Maricopa County School District
                              No. 21 GO, Series 1999 A,
                              (Murphy), 3.80%, 7/1/04 (MBIA)           566,996
                  500,000  Maricopa County School District
                              No. 28 GO, Series 1999 C,
                              (Kyrene Elementary Project of
                              1993), 4.40%, 7/1/08 (FGIC)              496,835
                  375,000  Maricopa County School District
                              No. 3 Elementary GO, Series
                              1998 C, (Tempe Project of
                              1997), 3.75%, 7/1/02 (MBIA)              374,179

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

               $  800,000  Maricopa County Unified School
                              District No. 40 GO, Series
                              1994 C, (Glendale Project of
                              1994), 7.75%, 7/1/06 (FGIC)          $   959,384
                1,000,000  Maricopa County Unified School
                              District No. 41 GO, Series
                              1988 F, (Gilbert Project of 1998), 6.20%,  7/1/02,
                              Prerefunded at 100% of Par
                              (FGIC)(1)                              1,067,690
                1,000,000  Maricopa County Unified School
                              District No. 48 GO, (Scottsdale),
                              6.60%, 7/1/12                          1,175,010
                  500,000  Maricopa County Unified School
                              District No. 80 GO, (Chandler),
                              5.20%, 7/1/13 (MBIA)                     516,915
                1,000,000  Maricopa County Unified School
                              District No. 90 GO, (Ruth Fisher
                              Elementary), 5.375%, 7/1/00            1,018,960
                1,000,000  Maricopa County Unified School
                              District No. 97 GO, Series
                              1996 A, (Deer Valley), 6.25%,
                              7/1/06 (MBIA)                          1,115,800
                1,000,000  Maricopa County Unified School
                              District No. 97 GO, Series
                              1999 G, (Deer Valley Project
                              of 1996), 5.60%, 7/1/00
                              (FSA)(2)                               1,024,590
                1,000,000  Maricopa County Unified School
                              District No. 97 GO, Series
                              1999 G, (Deer Valley Project
                              of 1996), 4.75%, 7/1/11
                              (FSA)(2)                                 997,680
                  500,000  Mesa Industrial Development Auth.
                              Rev., Series A-1, (Lutheran
                              Health Systems), 4.00%,
                              1/1/00 (MBIA)                            502,095
                1,000,000  Page Municipal Property Corp.
                              Excise Tax Rev., Series 1999 A,
                              5.00%, 7/1/15 (MBIA)                   1,006,010
                  300,000  Phoenix Airport Rev., Series
                              1994 C, 5.50%, 7/1/01 (MBIA)             309,876
                1,000,000  Phoenix Civic Improvement Corp.
                              Rev., (Senior Lien), 5.00%,
                              7/1/03                                 1,032,980
                1,000,000  Phoenix Civic Improvement Corp.
                              Wastewater System Lease Rev.,
                              4.85%, 7/1/07 (MBIA)                   1,026,810
                  550,000  Phoenix GO, 6.00%, 7/1/01                   575,498
                1,000,000  Phoenix GO, Series 1995 B,
                              5.00%, 7/1/09                          1,035,800
                1,000,000  Phoenix GO, Series 1999 A,
                              4.75%, 7/1/12                            995,620
                2,100,000  Phoenix Industrial Development
                              Auth. Single Family Mortgage
                              Rev., Series 1998 A, 6.60%,
                              12/1/29
                              (GNMA/FNMA/FHLMC)                      2,284,842

                                              See Notes to Financial Statements


8      1-800-345-2021


Arizona Intermediate-Term--Sched. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

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

               $  500,000  Phoenix Street and Highway Rev.,
                              5.95%, 7/1/00                        $   514,050
                1,000,000  Pima County Sewer Rev., 6.20%,
                              7/1/00 (FGIC)                          1,030,560
                1,000,000  Pima County Unified School
                              District No. 10 GO,
                              (Amphitheater), 5.75%, 7/1/04
                              (FGIC)(3)                              1,075,330
                1,000,000  Pima County Unified School
                              District No. 10 GO,
                              (Amphitheater), 7.00%, 7/1/05
                              (MBIA)                                 1,144,740
                1,000,000  Pima County Unified School
                              District No. 12 GO, (Sunnyside),
                              5.50%, 7/1/09 (MBIA)                   1,054,820
                1,200,000  Pima County Unified School
                              District No. 16 GO, (Catalina
                              Foothills), 5.75%, 7/1/06
                              (MBIA)                                 1,304,184
                  440,000  Pinal County COP, 4.30%,
                              6/1/07 (MBIA)                            436,559
                1,000,000  Salt River Project Agricultural
                              Improvement and Power District
                              Rev., Series 1993 B, 6.50%,
                              1/1/04                                 1,098,380
                  480,000  Scottsdale GO, 7.50%, 7/1/02                530,213
                1,000,000  Scottsdale Preservation Excise Tax
                              Auth. Rev., 4.50%, 7/1/24
                              (FGIC)                                   900,530
                1,150,000  Sedona Wastewater Municipal
                              Property Corporate Excise Tax
                              Rev., 5.20%, 7/1/20 (MBIA)(4)            389,459
                1,275,000  Tempe GO, 6.25%, 7/1/05(3)                1,413,057
                  525,000  Tucson COP, 5.70%, 7/1/02                   525,672

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

               $1,000,000  Tucson Street and Highway Rev.,
                              5.70%, 7/1/01                        $ 1,039,020
                1,000,000  University of Arizona Rev., 5.25%,
                              6/1/14 (FSA)                           1,019,770
                  500,000  Yavapai County Unified School
                              District No. 28 GO, (Camp
                              Verde), 6.10%, 7/1/04 (FGIC)             546,110
                                                                   -----------
                                                                    43,775,007
                                                                   -----------
PUERTO RICO--5.4%
                1,000,000  Puerto Rico Commonwealth GO,
                              5.75%, 7/1/11 (MBIA)                   1,099,360
                1,000,000  Puerto Rico Commonwealth GO,
                              4.50%, 7/1/23                            892,440
                  500,000  Puerto Rico Commonwealth
                              Infrastructure Financing Auth.
                              Special Tax Rev., Series
                              1998 A, 5.50%, 7/1/08
                              (AMBAC)                                  541,020
                                                                   -----------
                                                                     2,532,820
                                                                   -----------
TOTAL MUNICIPAL SECURITIES                                          46,307,827
                                                                   -----------
   (Cost $45,383,204)

SHORT-TERM MUNICIPAL SECURITIES--1.1%
                  500,000  Coconino County Pollution Control
                              Corp. Rev., Series 1994 A,
                              (Arizona Public Service-Navajo
                              Project), VRDN, 3.40%, 6/1/99
                              (LOC: Kredietbank N.V.)                  500,000
                                                                   -----------
   (Cost $500,000)

TOTAL INVESTMENT SECURITIES--100.0%                                $46,807,827
                                                                   ===========
   (Cost $45,883,204)

See Notes to Financial Statements


                                                  www.americancentury.com      9


Arizona Intermediate-Term--Sched. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

NOTES TO SCHEDULE OF INVESTMENTS

AMBAC = AMBAC Assurance Corporation

COP = Certificate of Participation

FGIC = Financial Guaranty Insurance Co.

FHLMC = Federal Home Loan Mortgage Corp.

FNMA = Federal National Mortgage Association

FSA = Financial Security Assurance Inc.

GNMA = Government National Mortgage Association

GO = General Obligation

LOC = Letter of Credit

MBIA = MBIA Insurance Corp.

VRDN = Variable Rate Demand Note.  Interest  reset date is indicated and used in
calculating the weighted average portfolio maturity. Rate shown is effective May
31, 1999.

(1)  Escrowed to maturity in U.S. government securities or state and local
     government securities.

(2) When-issued security.

(3)  Security,  or a portion thereof,  has been segregated at the custodian bank
     for a when-issued security.

(4)  Security is a zero-coupon municipal bond. The yield to maturity at purchase
     is indicated.  Zero-coupon  bonds are  purchased at a substantial  discount
     from their value at maturity.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* the principal amount of each investment

* the market value of each investment

* the dollar value of other short-term investments that are considered the same
  as cash

* the percentage of investments in each state

* the percent and dollar breakdown of each investment category

                                              See Notes to Financial Statements


10      1-800-345-2021


Statement of Assets and Liabilities
- --------------------------------------------------------------------------------

MAY 31, 1999

ASSETS
Investment securities, at value
  (identified cost of $45,883,204)
  (Note 3) .................................................         $46,807,827
Interest receivable ........................................             951,259
                                                                     -----------
                                                                      47,759,086
                                                                     -----------

LIABILITIES
Disbursements in excess of
  demand deposit cash ......................................             288,405
Payable for investments purchased ..........................           2,019,143
Dividends payable ..........................................              22,287
Accrued management fees (Note 2) ...........................              19,441
Payable for trustees' fees and expenses ....................                 171
                                                                     -----------
                                                                       2,349,447
                                                                     -----------
Net Assets .................................................         $45,409,639
                                                                     ===========

CAPITAL SHARES
Outstanding (unlimited number
  of shares authorized) ....................................           4,274,791
                                                                     ===========
Net Asset Value Per Share ..................................         $     10.62
                                                                     ===========

NET ASSETS CONSIST OF:
Capital paid in ............................................         $44,366,127
Accumulated undistributed net realized
  gain on investment transactions ..........................             118,889
Net unrealized appreciation on
  investments (Note 3) .....................................             924,623
                                                                     -----------
                                                                     $45,409,639
                                                                     ===========

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF ASSETS AND  LIABILITIES--This  statement details
what the fund owns (assets),  what it owes (liabilities),  and its net assets as
of the last day of the period.  If you subtract  what the fund owes from what it
owns, you get the fund's net assets.  The net assets divided by the total number
of shares  outstanding  gives you the price of an individual  share,  or the net
asset value per share.

NET ASSETS are also broken down by capital (money invested by shareholders); net
investment  income not yet paid to  shareholders  (if any);  net gains earned on
investment activity but not yet paid to shareholders or net losses on investment
activity  (known as realized  gains or losses);  and finally  gains or losses on
securities  still  owned  by the  fund  (known  as  unrealized  appreciation  or
depreciation).  This  breakdown  tells  you the  value  of net  assets  that are
performance-related,  such as investment  gains or losses,  and the value of net
assets that are not related to performance,  such as shareholder investments and
redemptions.

See Notes to Financial Statements


                                                 www.americancentury.com      11


Statement of Operations
- --------------------------------------------------------------------------------

YEAR ENDED MAY 31, 1999

INVESTMENT INCOME
Income:
Interest .................................................          $ 2,071,713
                                                                    -----------
Expenses (Note 2):
Management fees ..........................................              217,624
Trustees' fees and expenses ..............................                3,597
                                                                    -----------
                                                                        221,221
                                                                    -----------
Net investment income ....................................            1,850,492
                                                                    -----------

REALIZED AND UNREALIZED
GAIN (LOSS) ON INVESTMENTS
(NOTE 3)
Net realized gain on investments .........................              303,577
Change in net unrealized
  appreciation on investments ............................             (307,941)
                                                                    -----------
Net realized and unrealized
  loss on investments ....................................               (4,364)
                                                                    -----------
Net Increase in Net Assets
  Resulting from Operations ..............................          $ 1,846,128
                                                                    ===========

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF  OPERATIONS--This  statement breaks down how the
fund's  net  assets  changed  during  the  period  as a  result  of  the  fund's
operations.  It tells you how much money the fund made or lost after taking into
account income,  fees and expenses,  and investment gains or losses. It does not
include shareholder transactions and distributions.

Fund OPERATIONS include:

* interest income earned from investments

* management fees and other expenses

* gains or losses from selling investments (known as realized gains or losses)

* gains or losses on current fund holdings (known as unrealized appreciation or
  depreciation)

                                              See Notes to Financial Statements


12      1-800-345-2021


Statements of Changes in Net Assets
- --------------------------------------------------------------------------------

YEARS ENDED MAY 31, 1999 AND MAY 31, 1998

Increase in Net Assets                                 1999             1998

OPERATIONS
Net investment income ........................    $  1,850,492     $  1,553,800
Net realized gain on investments .............         303,577          247,543
Change in net unrealized appreciation
  on investments .............................        (307,941)         622,539
                                                  ------------     ------------
Net increase in net assets resulting
  from operations ............................       1,846,128        2,423,882
                                                  ------------     ------------

DISTRIBUTIONS TO SHAREHOLDERS
From net investment income ...................      (1,850,492)      (1,553,800)
From net realized gains on
  investment transactions ....................        (268,298)        (163,355)
                                                  ------------     ------------
Decrease in net assets from distributions ....      (2,118,790)      (1,717,155)
                                                  ------------     ------------

CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold ....................      16,288,072       18,049,886
Proceeds from reinvestment
  of distributions ...........................       1,608,799        1,285,629
Payments for shares redeemed .................     (12,261,906)     (10,549,469)
                                                  ------------     ------------
Net increase in net assets from
  capital share transactions .................       5,634,965        8,786,046
                                                  ------------     ------------
Net increase in net assets ...................       5,362,303        9,492,773

NET ASSETS
Beginning of period ..........................      40,047,336       30,554,563
                                                  ------------     ------------
End of period ................................    $ 45,409,639     $ 40,047,336
                                                  ============     ============

TRANSACTIONS IN SHARES  OF THE FUND
Sold .........................................       1,512,103        1,695,769
Issued in reinvestment of distributions ......         149,456          120,777
Redeemed .....................................      (1,140,362)        (989,926)
                                                  ------------     ------------
Net increase .................................         521,197          826,620
                                                  ============     ============

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF CHANGES IN NET ASSETS--These statements show how
the fund's net assets  changed over the past two reporting  periods.  It details
how much a fund grew or shrank as a result of:

* operations--a summary of the Statement of Operations from the previous page
  for the most recent period

* distributions--income and gains distributed to shareholders

* capital share transactions--shareholders' purchases, reinvestments, and
  redemptions

Net  assets  at the  beginning  of  the  period  plus  the  sum  of  operations,
distributions  to  shareholders  and capital  share  transactions  result in net
assets at the end of the period.

See Notes to Financial Statements


                                                 www.americancentury.com      13


Notes to Financial Statements
- --------------------------------------------------------------------------------

MAY 31, 1999

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    ORGANIZATION -- American  Century  Municipal Trust (the trust) is registered
under the Investment  Company Act of 1940 as an open-end  management  investment
company. Arizona Intermediate-Term Municipal Fund (the fund) is one of the eight
funds issued by the trust. The fund is  non-diversified  under the 1940 Act. The
objective of the fund is to seek as high a level of current  income  exempt from
federal  income taxes as is consistent  with prudent  investment  management and
conservation of  shareholders'  capital.  The fund invests  primarily in Arizona
intermediate-term  municipal obligations.  The fund concentrates its investments
in a single state and therefore may have more exposure to credit risk related to
the state of Arizona  than a fund with a broader  geographical  diversification.
The following  significant  accounting policies are in accordance with generally
accepted  accounting  principles;  these  principles  may  require  the  use  of
estimates by fund management.

    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 Trustees.

    SECURITY  TRANSACTIONS -- Security  transactions are accounted for as of the
trade date. 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.

    INCOME  TAX  STATUS  -- It is  the  fund's  policy  to  distribute  all  net
investment  income  and net  realized  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.  For the year ended May 31,  1999,  100%
(unaudited) of the fund's  distributions  from net  investment  income have been
designated as exempt from federal income tax.

    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  realized  gains  and  losses  for  financial
statement  and tax purposes  and may result in  reclassification  among  certain
capital accounts.

    FUTURES  CONTRACTS  -- The  fund  may buy and  sell  interest  rate  futures
contracts  relating to debt  securities  and write and buy put and call  options
relating  to  interest  rate  futures  contracts.  The fund may use  futures and
options  transactions  to maintain cash reserves while remaining fully invested,
to  facilitate  trading,  to  reduce  transaction  costs,  or to  pursue  higher
investment  returns when a futures contract is priced more attractively than its
underlying  security  or  index.  One of the  risks  of  entering  into  futures
contracts is the  possibility  that the changes in value of the contract may not
correlate with the changes in value of the underlying securities.  Upon entering
into a  futures  contract,  the  fund is  required  to  deposit  either  cash or
securities  in an amount equal to a certain  percentage  of the  contract  value
(initial margin).  Subsequent  payments  (variation margin) are made or received
daily,  in cash, by the fund. The variation  margin is equal to the daily change
in the contract  value and is recorded as an unrealized  gain or loss.  The fund
recognizes a realized gain or loss when the contract is closed or expires. There
were no open futures contracts at May 31, 1999.

    ADDITIONAL  INFORMATION  -- Funds  Distributor,  Inc.  (FDI) is the  trust's
distributor. Certain officers of FDI are also officers of the trust.

- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

    The trust has entered  into a Management  Agreement  with  American  Century
Investment  Management,  Inc.  (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 funds,  except  brokerage,
taxes,  portfolio insurance,  interest,  fees and expenses of those Trustees 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 calculated daily and paid monthly. It consists of an Investment
Category  Fee based on the average net assets of the funds in a specific  fund's
investment category and a Complex Fee based on the average net assets of all the
funds  managed by ACIM.  The rates for the  Investment  Category  Fee range from
0.1625%  to 0.2800%  and the rates for the  Complex  Fee range  from  0.2900% to
0.3100%.  For the year ended May 31, 1999, the effective  annual  management fee
was 0.51%.

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


14      1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

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

    Purchases  and sales for the period  ended May 31,  1999 of  municipal  debt
obligations,   excluding   short-term   investments,   totaled  $37,234,634  and
$30,049,777, respectively.

    As of May 31, 1999,  accumulated net unrealized  appreciation  was $924,623,
which  consisted  of  unrealized  appreciation  of  $1,053,121,  and  unrealized
depreciation  of $128,498.  The aggregate cost of investments for federal income
tax purposes was the same as the cost for financial reporting purposes.

- --------------------------------------------------------------------------------
4. BANK LOANS

    Effective  December  18,  1998,  the fund,  along with  certain  other funds
managed by ACIM,  entered  into an  unsecured  $570,000,000  bank line of credit
agreement  with  Chase  Manhattan  Bank.  Borrowings  under the  agreement  bear
interest at the Federal  Funds rate plus  0.40%.  The fund may borrow  money for
temporary or emergency  purposes to fund shareholder  redemptions.  The fund did
not borrow from the line  during the period  December  18, 1998  through May 31,
1999.

- --------------------------------------------------------------------------------
5. FUND EVENTS

  The following name change became effective March 1, 1999:

           =====================================================================
           NEW NAME                      FORMER NAME
           =====================================================================

  FUND:    Arizona Intermediate-Term     American Century - Benham Arizona
           Municipal Fund                Intermediate-Term Municipal Fund


                                                 www.americancentury.com      15


Arizona Intermediate-Term--Financial Highlights
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED MAY 31

                                              1999           1998           1997           1996           1995
PER-SHARE DATA
Net Asset Value,
<S>                                      <C>            <C>            <C>            <C>            <C>
  Beginning of Period ................   $    10.67     $    10.44     $    10.31     $    10.35     $    10.13
                                         ----------     ----------     ----------     ----------     ----------
Income From Investment Operations
  Net Investment Income ..............         0.46           0.46           0.45           0.51           0.51
  Net Realized and Unrealized Gain
  (Loss) on Investment Transactions ..         0.01           0.28           0.13          (0.03)          0.22
                                         ----------     ----------     ----------     ----------     ----------
  Total From Investment Operations ...         0.47           0.74           0.58           0.48           0.73
                                         ----------     ----------     ----------     ----------     ----------
Distributions
  From Net Investment Income .........        (0.46)         (0.46)         (0.45)         (0.51)         (0.51)
  From Net Realized Gains on
  Investment Transactions ............        (0.06)         (0.05)          --            (0.01)          --
                                         ----------     ----------     ----------     ----------     ----------
  Total Distributions ................        (0.52)         (0.51)         (0.45)         (0.52)         (0.51)
                                         ----------     ----------     ----------     ----------     ----------
Net Asset Value, End of Period .......   $    10.62     $    10.67     $    10.44     $    10.31     $    10.35
                                         ==========     ==========     ==========     ==========     ==========
  Total Return(1) ....................         4.51%          7.19%          5.77%          4.65%          7.52%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses to
  Average Net Assets
  (Before Expense Waiver) ............         0.51%          0.60%          0.79%          0.82%          1.01%
Ratio of Operating Expenses
to Average Net Assets ................         0.51%          0.54%          0.66%          0.14%          --
Ratio of Net Investment Income to
Average Net Assets
  (Before Expense Waiver) ............         4.30%          4.27%          4.22%          4.17%          4.15%
Ratio of Net Investment Income
to Average Net Assets ................         4.30%          4.33%          4.35%          4.85%          5.16%
Portfolio Turnover Rate ..............           70%            39%            81%            36%            33%
Net Assets, End of Period
  (in thousands) .....................   $   45,410     $   40,047     $   30,555     $   25,789     $   19,778
</TABLE>

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

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL  HIGHLIGHTS--This  statement itemizes current period
activity and  statistics  and provide  comparison  data for the last five fiscal
years.

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income and capital gains or losses

* income and capital gains distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

* portfolio turnover -- the percentage of the portfolio that was replaced during
  the period

                                              See Notes to Financial Statements


16      1-800-345-2021


Report of Independent Accountants
- --------------------------------------------------------------------------------

To  the  Board  of  Trustees  of  the  American  Century   Municipal  Trust  and
Shareholders the Arizona Intermediate-Term Municipal Fund:

In our opinion, the accompanying statement of assets and liabilities,  including
the schedule of  investments,  and the related  statements of operations  and of
changes  in net assets  and the  financial  highlights  present  fairly,  in all
material  respects,  the  financial  position of the  Arizona  Intermediate-Term
Municipal Fund (formerly the American Century - Benham Arizona Intermediate-Term
Municipal Fund) (one of the eight funds in the American Century Municipal Trust,
hereafter  referred  to as the "Fund") at May 31,  1999,  and the results of its
operations  for the year then  ended,  the  changes  in its net  assets  and the
financial  highlights  for each of the two years in the period  then  ended,  in
conformity  with  generally  accepted  accounting  principles.  These  financial
statements  and  financial  highlights  (hereafter  referred  to  as  "financial
statements") are the responsibility of the Fund's management; our responsibility
is to express an opinion on these financial  statements based on our audits. The
financial  highlights  for each of the three  years in the period  ended May 31,
1997,  were  audited  by other  auditors,  whose  report,  dated  July 7,  1997,
expressed an unqualified opinion on those statements. We conducted our audits of
these  financial  statements  in accordance  with  generally  accepted  auditing
standards, which require that we plan and perform the audit to obtain reasonable
assurance   about  whether  the  financial   statements  are  free  of  material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the  amounts  and  disclosures  in  the  financial  statements,   assessing  the
accounting  principles  used and significant  estimates made by management,  and
evaluating the overall  financial  statement  presentation.  We believe that our
audits,   which  included   confirmation  of  securities  at  May  31,  1999  by
correspondence  with the custodian and brokers,  provide a reasonable  basis for
the opinion expressed above.


                                                      PricewaterhouseCoopers LLP


Kansas City, Missouri
July 12, 1999


                                                 www.americancentury.com      17


Background Information
- --------------------------------------------------------------------------------

INVESTMENT PHILOSOPHY AND POLICIES

     American  Century offers 38 fixed-income  funds,  ranging from money market
portfolios  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:

     ARIZONA INTERMEDIATE-TERM MUNICIPAL seeks to provide interest income exempt
from both  Arizona and federal  income  taxes.  The fund  invests  primarily  in
intermediate-term  Arizona municipal  securities with maturities of four or more
years and maintains a weighted average maturity of 5-10 years.

     Depending  on your tax  status,  investment  income  may be  subject to the
federal  alternative  minimum  tax.  Capital  gains are not exempt from  federal
income tax.

COMPARATIVE INDICES

     The  following  indices  are  used  in  the  report  for  fund  performance
comparisons. They are not investment products available for purchase.

     The MERRILL LYNCH 0- TO 3-YEAR  MUNICIPAL INDEX has an average  maturity of
approximately two years. The bonds in the index have an average rating of AA1.

     The LEHMAN BROTHERS  FIVE-YEAR  MUNICIPAL  GENERAL  OBLIGATION INDEX has an
average  maturity of five years. The bonds are rated BBB or higher by Standard &
Poor's, with an average rating of AA.

     The  LEHMAN  BROTHERS  LONG-TERM   MUNICIPAL  BOND  INDEX  is  composed  of
investment-grade municipal bonds with maturities greater than 22 years.

LIPPER RANKINGS

     LIPPER INC. is an independent mutual fund ranking service. Rankings are
based on average annual total returns for each fund in a given category for the
periods indicated. Rankings are not included for periods less than one year.

     The funds in  Lipper's  OTHER  STATES  INTERMEDIATE  MUNICIPAL  DEBT  FUNDS
category invest in municipal debt issues with dollar-weighted average maturities
of 5-10 years and which are exempt from  taxation  on a specified  city or state
basis.

CREDIT RATING GUIDELINES

     Credit  ratings  are  issued  by  independent  research  companies  such as
Standard  & Poor's  and  Moody's.  Ratings  are based on an  issuer's  financial
strength and ability to pay interest and principal in a timely manner.

     It's important to note that credit ratings are  subjective,  reflecting the
opinions of the rating agencies; they are not absolute standards of quality.

     Securities  rated AAA,  AA, A, or BBB are  considered  "investment  grade,"
meaning they're relatively safe from default.

[left margin]

INVESTMENT TEAM LEADERS
   PORTFOLIO MANAGERS
     KEN SALINGER
     COLLEEN DENZLER
   MUNICIPAL CREDIT RESEARCH DIRECTOR
     STEVEN PERMUT


18      1-800-345-2021


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 16.

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 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.

*  TAX-EQUIVALENT  YIELDS show the taxable  yields that  investors in a combined
federal and Arizona  state income tax bracket would have to earn before taxes to
equal the fund's tax-free yield.

INVESTMENT TERMS

* BASIS POINT -- a basis point equals one  one-hundredth  of a percentage  point
(or 0.01%). Therefore, 100 basis points equals one percentage point (or 1%).

* YIELD CURVE -- a graphic  representation of the relationship  between maturity
and yield for  fixed-income  securities.  Yield curve  graphs  plot  lengthening
maturities along the horizontal axis and rising yields along the vertical axis.

PORTFOLIO STATISTICS

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

* WEIGHTED  AVERAGE  MATURITY  (WAM) -- a measurement  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.

* 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.

* 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's account.
(See Note 2 in the Notes to Financial Statements.)

TYPES OF MUNICIPAL SECURITIES

* COPS/LEASES -- securities issued to finance public property improvements (such
as city halls and police  stations) and  equipment  purchases.  Certificates  of
participation  represent long-term debt obligations,  while leases have a higher
risk profile than GOs because they require annual appropriation.

* GO BONDS -- general  obligation  securities  backed by the taxing power of the
issuer.

* LAND-SECURED  BONDS -- securities such as Mello-Roos  bonds and 1915-Act bonds
that are issued to finance real estate development projects.


                                                 www.americancentury.com      19


Glossary
- --------------------------------------------------------------------------------
                                                                    (Continued)

* PREREFUNDED BONDS/ETM BONDS --securities refinanced or escrowed to maturity by
the issuer because of their premium coupons (higher-than-market interest rates).
These  bonds  tend to have  higher  credit  ratings  because  they are backed by
Treasury securities.

* REVENUE  BONDS  --securities  backed by  revenues  from sales  taxes or from a
specific project, system, or facility (such as a hospital,  electric utility, or
water system).

FUND CLASSIFICATIONS

INVESTMENT OBJECTIVE

     The investment  objective may be based on the fund's objective as stated in
its  prospectus or fund profile,  or the fund's  categorization  by  independent
rating organizations based on its management style.

* CAPITAL  PRESERVATION  -- offers  taxable and tax-free  money market funds for
relative stability of principal and liquidity.

* INCOME -- offers funds that can provide current income and competitive yields,
as well as a strong and stable  foundation and generally lower volatility levels
than stock funds.

* GROWTH & INCOME --  offers  funds  that  emphasize  both  growth  and  income,
provided  by either  dividend-paying  equities  or a  combination  of equity and
fixed-income securities.

* GROWTH -- offers  funds with a focus on  capital  appreciation  and  long-term
growth,  generally providing high return potential with corresponding high price
fluctuation risk.

RISK

     The  classification  of funds  by risk  category  is based on  quantitative
historical  measures  as well as  qualitative  prospective  measures.  It is not
intended to be a precise  indicator of future risk or return levels.  The degree
of risk within each category can vary significantly,  and some fund returns have
historically  been  higher  than  more  aggressive  funds  or  lower  than  more
conservative  funds.  Please be aware that the fund's  category  may change over
time.  Therefore,  it is  important  that you read a fund's  prospectus  or fund
profile carefully before investing to ensure its objectives,  policies, and risk
potential are consistent with your needs.

*  CONSERVATIVE  -- these funds  generally  provide lower return  potential with
either low or minimal price fluctuation risk.

* MODERATE -- these funds  generally  provide  moderate  return  potential  with
moderate price fluctuation risk.

*  AGGRESSIVE  -- these  funds  generally  provide  high return  potential  with
corresponding high price fluctuation risk.


20      1-800-345-2021


[inside back cover]

===============================================================================
INVESTMENT OBJECTIVE - CAPITAL PRESERVATION
===============================================================================

                  RISK LEVEL - CONSERVATIVE

TAXABLE MONEY MARKETS           TAX-FREE MONEY MARKETS

Premium  Capital Reserve        FL Municipal Money Market
Prime Money Market              CA Municipal Money Market
Premium Government Reserve      CA Tax-Free Money Market
Government Agency               Tax-Free Money Market
   Money Market
Capital Preservation

===============================================================================
INVESTMENT OBJECTIVE - INCOME
===============================================================================

                   RISK LEVEL - AGGRESSIVE

TAXABLE BONDS                   TAX-FREE BONDS

Target 2025*                    CA High-Yield Municipal
Target 2020*                    High-Yield Municipal
Target 2015*
Target 2010*
High-Yield
International Bond

                    RISK LEVEL - MODERATE

TAXABLE BONDS                   TAX-FREE BONDS

Long-Term Treasury              CA Long-Term Tax-Free
Target 2005*                    Long-Term Tax-Free
Bond                            CA Insured Tax-Free
Premium Bond

                   RISK LEVEL - CONSERVATIVE

TAXABLE BONDS                   TAX-FREE BONDS

Intermediate-Term Bond          CA Intermediate-Term Tax-Free
Intermediate-Term Treasury      AZ Intermediate-Term Municipal
GNMA                            FL Intermediate-Term Municipal
Inflation-Adjusted Treasury     Intermediate-Term  Tax-Free
Limited-Term Bond               CA Limited-Term  Tax-Free
Target 2000*                    Limited-Term Tax-Free
Short-Term Government
Short-Term Treasury

===============================================================================
INVESTMENT OBJECTIVE - GROWTH AND INCOME
===============================================================================

                     RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY

Small Cap Quantitative
Small Cap Value

                      RISK LEVEL - MODERATE

ASSET ALLOCATION/BALANCED       DOMESTIC EQUITY        SPECIALTY

Strategic Allocation --         Equity Growth          Utilities
   Aggressive                   Equity Index           Real Estate
Balanced                        Tax-Managed Value
Strategic Allocation --         Income & Growth
   Moderate                     Value
Strategic Allocation --         Equity Income
   Conservative

===============================================================================
INVESTMENT OBJECTIVE - GROWTH
===============================================================================

                      RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY                 SPECIALTY              INTERNATIONAL

New Opportunities               Global Gold            Emerging Markets
Giftrust(reg.tm)                                       International Discovery
Vista                                                  International Growth
Heritage                                               Global Growth
Growth
Ultra(reg.tm)
Select

                       RISK LEVEL - MODERATE

SPECIALTY

Global Natural Resources


The investment  objective may be based on the fund's  objective as stated in its
prospectus or fund profile,  or the fund's  categorization by independent rating
organizations based on its management style.

The classification of funds by risk category is based on quantitative historical
measures as well as qualitative prospective measures. It is not intended to be a
precise  indicator  of future risk or return  levels.  The degree of risk within
each category can vary  significantly,  and some fund returns have  historically
been higher than more aggressive  funds or lower than more  conservative  funds.
Please be aware that a fund's  category may change over time.  Therefore,  it is
important  that you read a fund's  prospectus or fund profile  carefully  before
investing to ensure its  objectives,  policies and risk potential are consistent
with your needs.

For a definition of fund categories, see the Glossary.

*  While listed within the Income investment objective,  the Target funds do not
   pay current dividend income.  Income dividends are distributed once a year in
   December. The Target funds are listed in all three risk categories due to the
   dramatic  price  volatility  investors may  experience  during certain market
   conditions.  If held  to  their  target  dates,  however,  they  can  offer a
   conservative, dependable way to invest for a specific time horizon.

Please call  1-800-345-2021  for a prospectus or profile on any American Century
fund.  These  documents  contain  important  information  including  charges and
expenses, and you should read them carefully before you invest or send money.


[back cover]

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

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

WWW.AMERICANCENTURY.COM

INVESTOR RELATIONS
1-800-345-2021 OR 816-531-5575

AUTOMATED INFORMATION LINE
1-800-345-8765

FAX: 816-340-7962

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

BUSINESS, NOT-FOR-PROFIT, EMPLOYER-SPONSORED RETIREMENT PLANS
1-800-345-3533

AMERICAN CENTURY MUNICIPAL TRUST

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.

- --------------------------------------------------------------------------------
American Century Investments                                      BULK RATE
P.O. Box 419200                                               U.S. POSTAGE PAID
Kansas City, MO 64141-6200                                    AMERICAN CENTURY
www.americancentury.com                                           COMPANIES

9907                                                    Funds Distributor, Inc.
SH-ANN-17030                      (c)1999 American Century Services Corporation
<PAGE>
[front cover]
                                                                    MAY 31, 1999

ANNUAL REPORT
- -----------------
AMERICAN CENTURY

    [graphic of stairs]

- -----------------------
FLORIDA MUNICIPAL
MONEY MARKET

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


[inside front cover]


Y2K TESTING EFFORTS PAY  DIVIDENDS IN PREPAREDNESS
- --------------------------------------------------------------------------------

Y2K, short for the year 2000,  refers more  specifically to the date change from
December  31,  1999 to January  1, 2000.  This date  change is  significant  for
computers  because  many  were  originally  programmed  to  process  dates  with
two-character years -- 99 instead of 1999.

When the  calendar  rolls  to  2000,  this can  create  problems  for  computers
programmed  this way because they will read the date as "00," and may  interpret
it as 1900. Most companies have been working to reprogram their computer systems
with  four-digit  years.  Reprogramming  is very  labor-intensive  and  requires
testing  to ensure  that  there  are no  errors  and that all lines of code were
successfully changed.

Recognizing  the possible  impact of the Y2K issue,  our  senior-level  Steering
Committee,  programmers,  business  partners  and Y2K  team  have  been  working
diligently to make January 1, 2000 a non-event for American Century investors.

Currently,  all of our computer systems have been modified,  tested and returned
to  production.  We have an ongoing  commitment  to testing our systems with our
vendors and business partners and within the industry throughout the rest of the
year.

In March  and April of this  year,  we  participated  in the  Security  Industry
Association's (SIA) industry-wide test and successfully  processed  transactions
for dates up to and beyond 2000. American Century  transactions with our partner
firms were processed free of Y2K bugs. We also  participated  in the Market Data
Test conducted by the SIA and Financial  Information  Forum in May.  Again,  the
computer scripts were executed successfully with no Y2K-related errors.

In addition  to our testing  schedule,  our Y2K team has  developed  contingency
plans.  These  plans  will  minimize  the  impact on our  investors  and help us
maintain operations in the event of any Y2K-related  incidents.  We will conduct
practice  drills of  contingency  scenarios  during  the rest of 1999 and refine
those  plans to respond  quickly and  effectively  so that the date change is as
seamless as possible  for  investors.  We expect the year 2000 to be business as
usual at American Century.

Year 2000 Readiness Disclosure

[left margin]

FLORIDA MUNICIPAL MONEY MARKET
(BEFXX)
- ------------------------------------

Turn to the inside back cover of this  report to see a list of American  Century
funds classified by objective and risk.

AN IMPORTANT MESSAGE

    On March 1, we reorganized our funds under the American Century name. Though
the  venerable  Benham  name is  gone,  your  funds  will  maintain  their  same
disciplined investment management approach.

    James Benham's proven  fixed-income  investment  philosophy,  which provides
investors  a "pure  play" on a sector  of the bond  market,  will  remain.  That
investment practice--now a hallmark of investing at American Century--has helped
our fixed-income funds deliver solid performance over the years.

    In addition, we will continue to build our team of experienced  fixed-income
portfolio managers, which has doubled in size since American Century was formed.

    We look forward to continuing to meet your fixed-income  investment needs in
the tradition you have come to expect.


Our Message to You
- --------------------------------------------------------------------------------
/photo of James E. Stowers III and James E. Stowers, Jr./
James E. Stowers III, seated, with James E. Stowers, Jr.

     We experienced several investment mood swings in the U.S. financial markets
during the year ended May 31, 1999. When we last addressed you in the semiannual
report for American Century Florida Municipal Money Market,  money market yields
had  plunged  as  investors  rushed to the  relative  safety  and  liquidity  of
short-term  securities.  Investors were spooked by global economic and financial
turmoil.  The Federal  Reserve (the U.S.  central bank) cut short-term  interest
rates to bolster a seemingly  vulnerable U.S. economy and help stabilize markets
worldwide.

     The Fed's actions  helped turn things  around.  By January  1999,  overseas
economies were  stabilizing,  the U.S.  economy was posting  strong growth,  and
investor  confidence had rebounded.  As a result,  investors  moved out of money
market  securities in favor of stocks and  higher-yielding  bonds.  Money market
yields returned to higher levels, though they remained  significantly lower than
they were a year earlier.

     Investors in American Century funds benefited from other noteworthy events.
In March, we consolidated all our funds under the American Century name.  Though
we are proud of the venerable Twentieth Century and Benham names, we believe the
change makes it simpler for you to identify your funds.

     We also reclassified all 71 of our funds based on investment goals and risk
levels,  so you can more  easily  choose  the funds  that are  right for you.  A
complete list of American Century funds,  arranged by their new classifications,
is on the inside back cover of this report.

     In  addition,  we enhanced  our Web site  (www.americancentury.com).  There
you'll find daily fund  information -- including  performance  and price data --
market and national news,  and a Forms Center with access to the  most-requested
investor  forms  and  applications.  You  can  also  sign  up  to  receive  fund
prospectuses and shareholder reports electronically.

     Finally, we continued to expand the American Century investment team, which
has  doubled  over the  last  three  years.  We're  committed  to  building  and
maintaining a talented management group.

     As always, we appreciate your continued confidence in American Century.

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        Vice Chairman of the Board and
                                         Chief Executive Officer

[right margin]

               Table of Contents
   Frequently Asked
      Questions ...........................................................    2
FLORIDA MUNICIPAL MONEY MARKET
   Performance Information ................................................    3
   Portfolio at a Glance ..................................................    3
   Yields .................................................................    3
   Management Q&A .........................................................    4
   Portfolio Composition
      by Credit Rating ....................................................    4
   Portfolio Composition
      by Security Type ....................................................    4
   Schedule of Investments ................................................    5
FINANCIAL STATEMENTS
   Statement of Assets and
      Liabilities .........................................................    8
   Statement of Operations ................................................    9
   Statements of Changes
      in Net Assets .......................................................   10
   Notes to Financial
      Statements ..........................................................   11
   Financial Highlights ...................................................   12
   Report of Independent
      Accountants .........................................................   13
OTHER INFORMATION
   Background Information
      Investment Philosophy
         and Policies .....................................................   14
      Lipper Rankings .....................................................   14
      Credit Rating
         Guidelines .......................................................   14
      Investment and Credit
         Research Teams ...................................................   14
   Glossary ...............................................................   15


                                                  www.americancentury.com      1


Money Market Funds--Frequently Asked Questions
- --------------------------------------------------------------------------------

Can I make direct deposits into my money market fund account?

     Yes. You can arrange for direct deposit of your paycheck,  Social  Security
check,  Treasury Direct interest payment,  military allotment,  or payments from
other  government  agencies.  Give us a call, and we will send you the necessary
information to set it up.

What is the holding period on new deposits into my account?

     Generally,  there is an  eight-business-day  holding  period for  deposited
funds  (initial  investments  in a new account  are held for 15 calendar  days).
There is a  one-business-day  holding  period for U.S.  Treasury  checks,  money
orders, and travelers' checks.

Is there a limit on the number of checks I can write on my money market account?

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

Is there an easy way to move  money  from my money  market  fund into a stock or
bond fund?

     Yes.  Moving money  between  funds is called an  exchange,  and there is no
limit  on the  number  of  exchanges  you can make  out of a money  market  fund
account.  However,  there is a limit of six  exchanges  per calendar year out of
stock and bond fund accounts.

     Exchanges can be made by:

*    visiting our Web site at www.americancentury.com*

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

*    calling an Investor Relations Representative at 1-800-345-2021*

*    writing us a letter

How do I decide  whether a taxable money market fund or a tax-free  money market
fund is right for me?

     The most important  factor to consider is your tax bracket.  Tax-free money
market funds  typically  offer lower yields than taxable  funds,  but you pay no
federal income taxes on the income from a tax-free fund.

     If you are in one of the higher federal income tax brackets, taxes will eat
up a big part of your income from a taxable  money  market  fund,  so a tax-free
investment may be better for you. If you're in a lower tax bracket, then you can
usually earn more in a taxable fund even after taxes are deducted.

     We can help you  figure it out.  If you give us a call and tell us what tax
bracket  you're in, we can tell you whether you're likely to earn more after-tax
income in a tax-free or a taxable money market fund.

If you have any  questions  about our money market  funds,  call us toll free at
1-800-345-2021 or e-mail us at our Web site, www.americancentury.com.

* Before an  investor  can make an  exchange  by calling an  Investor  Relations
  Representative,  using our  Automated  Information  Line,  or visiting our Web
  site, the investor first must have provided us with written  authorization  to
  do so.

[left margin]

A FASTER AND EASIER WAY TO DEPOSIT MUTUAL FUND DISTRIBUTIONS

If you prefer to have your fund dividend or capital gains  distributions sent to
you  instead of  reinvesting  them,  there are a couple of ways to get access to
this money faster than waiting for a check in the mail:

*   You can  have  distributions  deposited  directly  into  your  money  market
    account. The money will be deposited the same day that the distributions are
    paid.

*   Distributions  can be sent  electronically  to your bank account.  The money
    will be available in you bank account within three days.

Contact an Investor Relations Representative to set up either of these options.


2      1-800-345-2021


Florida Municipal Money Market--Performance
- --------------------------------------------------------------------------------

TOTAL RETURNS AS OF MAY 31, 1999

              FLORIDA MUNICIPAL   OTHER STATES TAX-EXEMPT MONEY MARKET FUNDS(2)
                MONEY MARKET          AVERAGE RETURN       FUND'S RANKING
=============================================================================
6 MONTHS(1) ......  1.37%                 1.30%                  --
1 YEAR ...........  2.92%                 2.80%             13 OUT OF 36
=============================================================================
AVERAGE ANNUAL
RETURNS
3 YEARS(3) .......  3.26%                 3.05%              6 OUT OF 33
5 YEARS(3) .......  3.47%                 3.15%              1 OUT OF 18
LIFE OF FUND(3) ..  3.45%                 3.15%(4)           1 OUT OF 17(4)

The fund's inception date was 4/11/94.

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

(2) According to Lipper Inc., an independent mutual fund ranking service.

(3) Returns and rankings  would have been lower if management  fees had not been
    waived from 4/11/94 to 12/31/96.

(4) Since 4/30/94,  the date nearest the fund's  inception for which return data
    are available.

See pages 14-15 for more information about returns and Lipper fund rankings.


PORTFOLIO AT A GLANCE
                                  AS OF 5/31/99
NET ASSETS                        $87.5 MILLION
                            5/31/99           5/31/98
NUMBER OF SECURITIES          42                45
WEIGHTED AVERAGE
  MATURITY                  54 DAYS           54 DAYS
EXPENSE RATIO                0.50%            0.51%*

* On August 1, 1997, a new management agreement with American Century
  Investment Management, Inc. went into effect. The agreement reduced
  management fees to approximately 0.50%.

YIELDS AS OF MAY 31, 1999
   7-DAY CURRENT YIELD            2.92%
   7-DAY EFFECTIVE YIELD          2.96%
   7-DAY TAX-EQUIVALENT YIELDS
      28.0% TAX BRACKET           4.06%
      31.0% TAX BRACKET           4.23%
      36.0% TAX BRACKET           4.56%
      39.6% TAX BRACKET           4.83%

Past performance does not guarantee future results.

Money market funds are neither  insured nor  guaranteed by the FDIC or any other
government agency.

Yields will fluctuate, and although the fund seeks to preserve the value of your
investment  at $1 per share,  it is possible to lose money by  investing  in the
fund. The 7-day yield more closely reflects  earnings of the fund than the total
return.


                                                  www.americancentury.com      3


Florida Municipal Money Market--Q&A
- --------------------------------------------------------------------------------
/photo of Bryan Karcher/

     An  interview  with Bryan  Karcher,  a  portfolio  manager  on the  Florida
Municipal Money Market fund investment team.

HOW DID FLORIDA  MUNICIPAL MONEY MARKET PERFORM DURING THE FISCAL YEAR ENDED MAY
31, 1999?

     The fund's  fiscal-year  return  beat the  average  return of the 36 "Other
States  Tax-Exempt  Money Market Funds" tracked by Lipper Inc. (See the previous
page for fund returns and performance  comparisons.) Its longer-term returns are
similarly strong.

THE FUND'S  7-DAY  CURRENT  YIELD CAME DOWN A LITTLE IN THE PAST YEAR  (3.26% TO
2.92%). WHY?

     It's partly  because of the general drop in  short-term  interest  rates in
1998. In response to increasing  global market  volatility,  the Federal Reserve
lowered short-term rates three times between September and November.

     Supply  and demand  factors in the  Florida  municipal  market  also had an
impact. Supply decreased  dramatically--budget  surpluses at many municipalities
reduced  their  borrowing  needs.  Meanwhile,  demand for  short-term  municipal
securities  surged.  By February,  tax-free  money  market  yields were at their
lowest levels in nearly five years.

HOW DID YOU POSITION THE FUND IN THIS ENVIRONMENT?

     Although we extended the fund's average maturity  somewhat when the Fed was
cutting interest rates, we generally allowed the average maturity to drift lower
(as  low as 18  days  at  the  end of  March).  For  much  of the  fiscal  year,
longer-term securities weren't offering any extra yield over shorter-term notes,
so we didn't extend even though rates were declining.

     However,  we did lengthen the average  maturity  during tax season in April
and May, when investors  withdraw money from their money market  accounts to pay
income taxes. As funds sell securities to meet these redemptions,  we often find
one-year securities with attractive yields.

     This year was no  exception--we  bought  one-year  notes  yielding 25 basis
points (0.25%--a basis point equals 0.01%) more than shorter-term securities. As
a result,  we lengthened the fund's average maturity to about 54 days by the end
of May.

WHAT'S YOUR OUTLOOK FOR THE FLORIDA MUNICIPAL MONEY MARKET?

     Municipal money market yields have risen in recent weeks in anticipation of
an interest  rate  increase by the Fed. As expected,  the Fed raised  short-term
rates in late June,  expressing concern about the U.S. economy's  strength.  But
the Fed also suggested that it may not raise rates again for a while.

     We took advantage of rising yields to lengthen the fund's average  maturity
out to nearly 80 days in early June.  However, we think that yields will be more
stable going forward,  so we expect to bring the average maturity back down to a
neutral position in the coming months.

[left margin]

PORTFOLIO COMPOSITION BY
CREDIT RATING
               % OF FUND INVESTMENTS
              AS OF             AS OF
             5/31/99          11/30/98
SP1+           94%               88%
SP1             6%               12%

Ratings provided by Standard & Poor's.  See Credit Rating  Guidelines on page 14
for more information.

[pie charts - data below]

PORTFOLIO COMPOSITION BY
SECURITY TYPE

AS OF MAY 31, 1999
VRDNs                         81%
Bonds less than 1 Year        19%

AS OF NOVEMBER 30, 1998
VRDNs                         81%
Put Bonds                      9%
Bonds less than 1 Year         7%
Commercial Paper               3%

Security types are defined on page 15.


4      1-800-345-2021


Florida Muni. Money Market--Sch. of Investments
- --------------------------------------------------------------------------------

MAY 31, 1999

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
SHORT-TERM MUNICIPAL SECURITIES
               $2,135,000  Broward County Industrial
                              Development Rev., (Fast Real
                              Estate Partners), VRDN, 3.35%,
                              6/2/99 (LOC: Suntrust Bank
                              South Florida, N.A.) (Acquired
                              3/10/97-3/20/98, Cost
                              $2,135,000)(1)                        $ 2,135,000
                2,500,000  Broward County Industrial
                              Development Rev., (HEICO
                              Aerospace Corp.), VRDN,
                              3.35%, 6/2/99 (LOC: Suntrust
                              Bank South Florida, N.A.)
                              (Acquired 10/17/96, Cost
                              $2,500,000)(1)(2)                       2,500,000
                2,230,000  Broward County Industrial
                              Development Rev., (MDR
                              Fitness Corp.), VRDN, 3.35%,
                              6/2/99 (LOC: Suntrust Bank,
                              Miami, N.A.) (Acquired
                              2/28/96-3/3/97, Cost
                              $2,230,000)(1)                          2,230,000
                1,800,000  Broward County Industrial
                              Development Rev., (W.R. Bonsal
                              Co.), VRDN, 3.40%, 6/3/99
                              (LOC: NationsBank, N.A.)
                              (Acquired 3/18/98, Cost
                              $1,800,000)(1)                          1,800,000
                3,870,000  Coral Springs Industrial
                              Development Rev., (Royal
                              Plastics Group), VRDN, 3.35%,
                              6/2/99 (LOC: Suntrust Bank
                              South Florida, N.A.) (Acquired
                              4/1/96-12/9/98, Cost
                              $3,870,000)(1)                          3,870,000
                2,500,000  Dade County Aviation Rev.,
                              Series 1997 A, (Miami
                              International Airport), 4.60%,
                              10/1/99 (FSA)                           2,512,043
                1,000,000  Dade County Industrial
                              Development Auth. Rev.,
                              Series 1989 B, (Stephen M.
                              Green), VRDN, 3.35%, 6/2/99
                              (LOC: Suntrust Bank, Miami,
                              N.A.) (Acquired 4/28/94-
                              2/23/95, Cost $1,000,000)(1)            1,000,000
                4,000,000  Dade County Special Obligation
                              Trust Receipts, Series 1998 C-2,
                              VRDN, 3.45%, 6/2/99 (LOC:
                              Bank of America NT&SA)
                              (Acquired 12/15/98-1/22/99,
                              Cost $4,000,000)(1)                     4,000,000
                4,320,000  Escambia County Housing
                              Finance Auth. Single Family
                              Mortgage Rev., VRDN, 3.39%,
                              6/3/99 (Liquidity: Merrill Lynch
                              & Co., Inc.) (Acquired 4/9/98,
                              Cost $4,320,000)(1)                     4,320,000

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

               $1,530,000  Escambia County Housing
                              Finance Auth. Single Family
                              Mortgage Rev., VRDN, 3.39%,
                              6/3/99 (SBBPA: Merrill Lynch
                              & Co., Inc.) (Acquired 12/3/96,
                              Cost $1,530,000)(1)                   $ 1,530,000
                6,485,000  Florida Housing Finance Agency
                              Rev., (Country Club), VRDN,
                              3.80%, 6/1/99 (LOC: Northern
                              Trust Company)                          6,485,000
                4,650,000  Florida Housing Finance Agency
                              Rev., Series 1989 J, (Ashley
                              Lake II), VRDN, 3.45%,
                              6/2/99 (LOC: Morgan
                              Guaranty Trust Co. of New York)         4,650,000
                4,500,000  Florida Housing Finance Agency
                              Rev., Series 1996 F, (Caribbean
                              Key), VRDN, 3.35%, 6/2/99
                              (LOC: KeyBank, N.A.)                    4,500,000
                2,000,000  Florida Housing Finance Agency
                              Rev., Series 1996 P, (Tiffany
                              Club), VRDN, 3.35%, 6/2/99
                              (LOC: NationsBank, N.A.)                2,000,000
                4,345,000  Florida Housing Finance Agency
                              Trust Receipts, VRDN, 3.45%,
                              6/2/99 (LOC: Bank of New
                              York) (Acquired 2/12/98, Cost
                              $4,345,000)(1)                          4,345,000
                3,900,000  Florida Housing Finance Corp.
                              Rev., Series 1998 E,
                              (Club at Vero Apartments),
                              VRDN, 3.45%, 6/2/99 (LOC:
                              NationsBank, N.A.)                      3,900,000
                1,795,000  Florida Municipal Loan Council
                              Rev., 3.20%, 4/1/00 (MBIA)              1,795,000
                2,000,000  Florida State Board of Education
                              Capital Outlay GO, 6.75%,
                              6/1/00                                  2,069,373
                1,000,000  Florida State Board of Education
                              Capital Outlay GO, 7.00%,
                              6/1/00, Prerefunded at 102%
                              of Par(3)                               1,056,397
                1,000,000  Florida State Board of Education
                              Capital Outlay GO, 7.00%,
                              6/1/00, Prerefunded at 102%
                              of Par(3)                               1,056,404
                2,095,000  Florida State Board of Education
                              Capital Outlay GO, Series
                              1989 A, 7.25%, 6/1/00,
                              Prerefunded at 102% of Par(3)           2,218,267
                  250,000  Florida State Board of Education
                              Capital Outlay GO, Series
                              1994 E, 5.10%, 6/1/00                     253,881
                  500,000  Florida State Division Board of
                              Finance Department General
                              Services Rev., Series 1991 A,
                              (Preservation 2000), 6.20%,
                              7/1/99 (AMBAC)                            501,199

See Notes to Financial Statements


                                                  www.americancentury.com      5


Florida Muni. Money Market--Sch. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

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

               $1,740,000  Florida State GO, (Department of
                              Transportation), 6.875%,
                              7/1/99                                $ 1,745,201
                  500,000  Florida State GO, Series 1997 B,
                              (Department of Transportation),
                              5.00%, 7/1/99                             500,689
                1,815,000  Gulf Breeze Rev., Series 1985 B,
                              (Local Govt. Loan), VRDN,
                              3.25%, 6/3/99 (FGIC)
                              (SBBPA: Credit Local de
                              France)                                 1,815,000
                  800,000  Indian River County Industrial
                              Development Rev., (Florida
                              Convention Centers), VRDN,
                              4.05%, 6/1/99 (LOC:
                              Toronto-Dominion Bank)                    800,000
                1,000,000  Marion County Housing Finance
                              Auth. Multifamily Rev., Series
                              1985 F, (Paddock Place),
                              VRDN, 3.35%, 6/3/99 (LOC:
                              Suntrust Bank, Atlanta, GA)             1,000,000
                  945,000  Martin County Industrial
                              Development Auth. Rev.,
                              (Florida R.F. Labs Inc.), VRDN,
                              3.35%, 6/2/99 (LOC: Suntrust
                              Bank Central Florida, N.A.)
                              (Acquired 2/28/96-12/9/98,
                              Cost $945,000)(1)                         945,000
                  500,000  Martin County Industrial
                              Development Auth. Rev.,
                              (Tampa Farm Service Inc.),
                              VRDN, 3.35%, 6/2/99 (LOC:
                              Suntrust Bank Central Florida,
                              N.A.) (Acquired 6/13/96-
                              12/9/98, Cost $500,000)(1)                500,000
                2,800,000  Miami-Dade County Industrial
                              Development Auth. Rev., (Dutton
                              Press Inc.), VRDN, 3.35%,
                              6/2/99 (LOC: Suntrust Bank,
                              Miami, N.A.) (Acquired
                              2/27/98-2/17/99, Cost
                              $2,800,000)(1)                          2,800,000
                2,000,000  Miami-Dade County Industrial
                              Development Auth. Rev.,
                              Series 1999 A, (Edron Fixture
                              Corp.), VRDN, 3.35%, 6/2/99
                              (LOC: Suntrust Bank, Miami,
                              N.A.) (Acquired 3/23/99, Cost
                              $2,000,000)(1)                          2,000,000
                  690,000  Miami-Dade County Stormwater
                              Utility Rev., 3.00%, 4/1/00
                              (AMBAC)                                   688,870

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

               $3,000,000  Orange County Health Facilities
                              Auth. Rev., VRDN, 3.25%,
                              6/17/99 (Liquidity: Merrill
                              Lynch & Co., Inc.) (Acquired
                              12/15/98, Cost $3,000,000)(1)         $ 3,000,000
                1,150,000  Orange County Housing Finance
                              Auth. Multifamily Guaranteed
                              Mortgage Rev., Series 1989 A,
                              (Sundown Association II),
                              VRDN, 3.45%, 6/2/99 (LOC:
                              Fleet Bank, N.A.)                       1,150,000
                1,850,000  Orange County Industrial
                              Development Auth. Rev.,
                              (Precision Meters Inc.), VRDN,
                              3.35%, 6/2/99 (LOC: Suntrust
                              Bank, Central Florida, N.A.)
                              (Acquired 3/24/99, Cost
                              $1,850,000)(1)                          1,850,000
                  510,000  Osceola County Sales Tax Rev.,
                              3.25%, 4/1/00 (FSA)(4)                    510,000
                  485,000  Pensacola Airport Rev., Series
                              1998 A, 6.00%, 10/1/99
                              (MBIA)                                    489,098
                2,200,000  Pinellas County Industrial Council
                              Development Rev., (Better
                              Business Forms Inc.), VRDN,
                              3.35%, 6/2/99 (LOC: Suntrust
                              Bank, Tampa Bay) (Acquired
                              11/13/97-3/20/98, Cost
                              $2,200,000)(1)                          2,200,000
                2,100,000  Pinellas County Industrial Council
                              Development Rev., (Hunter
                              Douglas Inc.), VRDN, 3.35%,
                              6/2/99 (LOC: ABN Amro Bank
                              N.V.) (Acquired 3/17/97, Cost
                              $2,100,000)(1)                          2,100,000
                  500,000  Pinellas County Sewer Rev.,
                              4.00%, 10/1/99 (FGIC)                     501,384
                1,670,000  Volusia County Industrial
                              Development Auth. Rev.,
                              (Daytona Plastix Inc.), VRDN,
                              3.35%, 6/2/99 (LOC: Suntrust
                              Bank, Central Florida, N.A.)
                              (Acquired 7/17/96-12/19/97,
                              Cost $1,670,000)(1)                     1,670,000
                                                                   -------------
TOTAL INVESTMENT SECURITIES--100.0%                                 $86,992,806
                                                                   =============

See Notes to Financial Statements


6      1-800-345-2021


Florida Muni. Money Market--Sch. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

NOTES TO SCHEDULE OF INVESTMENTS

AMBAC = AMBAC Assurance Corporation

FGIC = Financial Guaranty Insurance Co.

FSA = Financial Security Assurance Inc.

GO = General Obligation

LOC = Letter of Credit

MBIA = MBIA Insurance Corp.

SBBPA = Standby Bond Purchase Agreement

VRDN = Variable Rate Demand Note.  Interest  reset date is indicated and used in
calculating the weighted average portfolio maturity. Rate shown is effective May
31, 1999.

(1)  Security was purchased  under Rule 144A of the  Securities Act of 1933 and,
     unless registered under the Act or exempted from registration,  may be sold
     only to qualified  institutional  investors.  The aggregate  value of these
     securities at May 31, 1999, was $44,795,000, which represented 51.2% of net
     assets. None of these securities are considered to be illiquid.

(2)  Security,  or a portion thereof,  has been segregated at the custodian bank
     for a when-issued security.

(3)  Escrowed  to  maturity  in U.S.  government  securities  or state and local
     government securities.

(4) When-issued security.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* the principal amount of each investment

* the amortized cost of each investment

See Notes to Financial Statements


                                                  www.americancentury.com      7


Statement of Assets and Liabilities
- --------------------------------------------------------------------------------

MAY 31, 1999

ASSETS
Investment securities, at value
  (amortized cost and cost for
  federal income tax purposes) ...........................           $86,992,806
Cash .....................................................               466,824
Interest receivable ......................................               618,857
                                                                     -----------
                                                                      88,078,487
                                                                     -----------

LIABILITIES
Payable for investments purchased ........................               511,473
Dividends payable ........................................                20,123
Accrued management fees (Note 2) .........................                37,110
Payable for trustees' fees
  and expenses ...........................................                   324
                                                                     -----------
                                                                         569,030
                                                                     -----------
Net Assets ...............................................           $87,509,457
                                                                     ===========

CAPITAL SHARES
Outstanding (unlimited number
  of shares authorized) ..................................            87,509,457
                                                                     ===========
Net Asset Value Per Share ................................           $      1.00
                                                                     ===========

NET ASSETS CONSIST OF:
Capital paid in ..........................................           $87,509,457
                                                                     ===========

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF ASSETS AND  LIABILITIES--This  statement details
what the fund owns (assets),  what it owes (liabilities),  and its net assets as
of the last day of the period.  If you subtract  what the fund owes from what it
owns, you get the fund's net assets.  The net assets divided by the total number
of shares  outstanding  gives you the price of an individual  share,  or the net
asset value per share.

NET ASSETS are also broken down by capital (money invested by shareholders); net
investment income not yet paid to shareholders (if any); and net gains earned on
investment activity but not yet paid to shareholders or net losses on investment
activity (known as realized gains or losses). This breakdown tells you the value
of net assets that are performance-related,  such as investment gains or losses,
and the  value  of net  assets  that are not  related  to  performance,  such as
shareholder investments and redemptions.

                                              See Notes to Financial Statements


8      1-800-345-2021


Statement of Operations
- --------------------------------------------------------------------------------

YEAR ENDED MAY 31, 1999

INVESTMENT INCOME
Income:
Interest ................................................             $3,459,733
                                                                      ----------
Expenses (Note 2):
Management fees .........................................                505,045
Trustees' fees and expenses .............................                  6,314
                                                                      ----------
                                                                         511,359
                                                                      ----------
Net investment income ...................................             $2,948,374
                                                                      ==========

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF  OPERATIONS--This  statement breaks down how the
fund's  net  assets  changed  during  the  period  as a  result  of  the  fund's
operations.  It tells you how much money the fund made or lost after taking into
account income,  fees and expenses,  and investment gains or losses. It does not
include shareholder transactions and distributions.

Fund OPERATIONS include:

* interest income earned from investments

* management fees and other expenses

See Notes to Financial Statements


                                                  www.americancentury.com      9


Statements of Changes in Net Assets
- --------------------------------------------------------------------------------

YEARS ENDED MAY 31, 1999 AND MAY 31, 1998

Decrease in Net Assets                              1999              1998

OPERATIONS
Net investment income ..................      $   2,948,374       $   3,755,691
                                              -------------       -------------

DISTRIBUTIONS TO SHAREHOLDERS
From net investment income .............         (2,948,374)         (3,755,691)
                                              -------------       -------------

CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold ..............        136,641,148         282,351,887
Proceeds from reinvestment
of distributions .......................          2,500,325           3,240,863
Payments for shares redeemed ...........       (161,316,337)       (288,037,630)
                                              -------------       -------------
Net decrease in net assets from
capital share transactions .............        (22,174,864)         (2,444,880)
                                              -------------       -------------
Net decrease in net assets .............        (22,174,864)         (2,444,880)

NET ASSETS
Beginning of period ....................        109,684,321         112,129,201
                                              -------------       -------------
End of period ..........................      $  87,509,457       $ 109,684,321
                                              =============       =============

TRANSACTIONS IN SHARES
OF THE FUND
Sold ...................................        136,641,148         282,351,887
Issued in reinvestment of
distributions ..........................          2,500,325           3,240,863
Redeemed ...............................       (161,316,337)       (288,037,630)
                                              -------------       -------------
Net decrease ...........................        (22,174,864)         (2,444,880)
                                              =============       =============

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF CHANGES IN NET ASSETS--These statements show how
the fund's net assets  changed over the past two reporting  periods.  It details
how much a fund grew or shrank as a result of:

* operations--a summary of the Statement of Operations from the previous page
  for the most recent period

* distributions--income and gains distributed to shareholders

* capital share transactions--shareholders' purchases, reinvestments, and
  redemptions

Net  assets  at the  beginning  of  the  period  plus  the  sum  of  operations,
distributions  to  shareholders  and capital  share  transactions  result in net
assets at the end of the period.

                                              See Notes to Financial Statements


10      1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------

MAY 31, 1999

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    ORGANIZATION -- American  Century  Municipal Trust (the trust) is registered
under the Investment  Company Act of 1940 as an open-end  management  investment
company.  Florida  Municipal  Money  Market  Fund (the fund) is one of the eight
funds issued by the trust. The fund is  non-diversified  under the 1940 Act. Its
investment  objective is to seek as high a level of current  income  exempt from
federal  income taxes as is consistent  with prudent  investment  management and
conservation  of  shareholders'  capital by investing  primarily  in  short-term
municipal  obligations.  The fund concentrates its investments in a single state
and  therefore  may have more  exposure to credit  risk  related to the state of
Florida than a fund with a broader geographical  diversification.  The following
significant  accounting  policies  are in  accordance  with  generally  accepted
accounting principles; these principles may require the use of estimates by fund
management.

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

    SECURITY  TRANSACTIONS -- Security  transactions are accounted for as of the
trade date. 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.

    INCOME  TAX  STATUS  -- It is  the  fund's  policy  to  distribute  all  net
investment  income  and net  realized  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  and  credited  daily and  distributed  monthly.  The fund does not
expect to realize any long-term capital gains, and accordingly,  does not expect
to pay any capital gain  distributions.  For the year ended May 31,  1999,  100%
(unaudited) of the fund's  distributions  from net  investment  income have been
designated as exempt from federal income tax.

    ADDITIONAL  INFORMATION  -- Funds  Distributor,  Inc.  (FDI) is the  trust's
distributor. Certain officers of FDI are also officers of the trust.

- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

    The trust has entered  into a Management  Agreement  with  American  Century
Investment  Management,  Inc.  (ACIM) that  provides  each fund with  investment
advisory and management  services in exchange for a single,  unified  management
fee. The Agreement  provides that all expenses of the funds,  except  brokerage,
taxes, portfolio insurance,  interest,  fees and expenses of those Trustees' 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 calculated daily and paid monthly. It consists of an Investment
Category  Fee based on the average net assets of the funds in a specific  fund's
investment category and a Complex Fee based on the average net assets of all the
funds  managed by ACIM.  The rates for the  Investment  Category  Fee range from
0.1570%  to 0.2700%  and the rates for the  Complex  Fee range  from  0.2900% to
0.3100%.  For the year ended May 31, 1999, the effective  annual  management fee
was 0.50%.

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

- --------------------------------------------------------------------------------
3. FUND EVENTS

  The following name change became effective March 1, 1999:

           =====================================================================
           NEW NAME                      FORMER NAME
           =====================================================================

  FUND:    Florida Municipal Money       American Century - Benham Florida
           Market Fund                   Municipal Money Market Fund


                                                 www.americancentury.com      11


Florida Muni. Money Market--Financial Highlights
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED MAY 31

                                        1999          1998            1997           1996           1995
PER-SHARE DATA
Net Asset Value,
<S>                                <C>            <C>            <C>            <C>            <C>
Beginning of Period .............  $      1.00    $      1.00    $      1.00    $      1.00    $      1.00
                                   -----------    -----------    -----------    -----------    -----------
Income From Investment
Operations
Net Investment Income ...........         0.03           0.03           0.03           0.04           0.04
                                   -----------    -----------    -----------    -----------    -----------
Distributions
From Net Investment Income ......        (0.03)         (0.03)         (0.03)         (0.04)         (0.04)
                                   -----------    -----------    -----------    -----------    -----------
Net Asset Value, End of Period ..  $      1.00    $      1.00    $      1.00    $      1.00    $      1.00
                                   ===========    ===========    ===========    ===========    ===========
Total Return(1) .................         2.92%          3.31%          3.55%          3.86%          3.71%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets
(Before Expense Waiver) .........         0.50%          0.53%          0.66%          0.71%          0.88%
Ratio of Operating Expenses
to Average Net Assets ...........         0.50%          0.51%          0.12%          0.01%          --
Ratio of Net Investment Income
to Average Net Assets
(Before Expense Waiver) .........         2.88%          3.23%          2.94%          3.05%          3.05%
Ratio of Net Investment Income
to Average Net Assets ...........         2.88%          3.25%          3.48%          3.75%          3.93%
Net Assets, End of Period
(in thousands) ..................  $    87,509    $   109,684    $   112,129    $    99,993    $    45,147
</TABLE>

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

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL  HIGHLIGHTS--This  statement itemizes current period
activity and  statistics  and provide  comparison  data for the last five fiscal
years.

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income

* income distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

                                              See Notes to Financial Statements


12      1-800-345-2021


Report of Independent Accountants
- --------------------------------------------------------------------------------

To  the  Board  of  Trustees  of  the  American  Century   Municipal  Trust  and
Shareholders of the Florida Municipal Money Market Fund:

In our opinion, the accompanying statement of assets and liabilities,  including
the schedule of  investments,  and the related  statements of operations  and of
changes  in net assets  and the  financial  highlights  present  fairly,  in all
material respects,  the financial position of the Florida Municipal Money Market
Fund  (formerly the American  Century - Benham  Florida  Municipal  Money Market
Fund) (one of the eight funds in the American Century Municipal Trust, hereafter
referred to as the "Fund") at May 31,  1999,  and the results of its  operations
for the year  then  ended,  the  changes  in its net  assets  and the  financial
highlights  for each of the two years in the period  then ended,  in  conformity
with generally accepted accounting  principles.  These financial  statements and
financial highlights  (hereafter referred to as "financial  statements") are the
responsibility  of the Fund's  management;  our  responsibility is to express an
opinion  on these  financial  statements  based  on our  audits.  The  financial
highlights  for each of the three years in the period ended May 31,  1997,  were
audited by other  auditors,  whose  report,  dated July 7,  1997,  expressed  an
unqualified  opinion  on those  statements.  We  conducted  our  audits of these
financial  statements in accordance with generally accepted auditing  standards,
which require that we plan and perform the audit to obtain reasonable  assurance
about whether the financial  statements  are free of material  misstatement.  An
audit includes examining,  on a test basis,  evidence supporting the amounts and
disclosures in the financial  statements,  assessing the  accounting  principles
used and  significant  estimates made by management,  and evaluating the overall
financial  statement  presentation.  We believe that our audits,  which included
confirmation of securities at May 31, 1999 by correspondence  with the custodian
and brokers, provide a reasonable basis for the opinion expressed above.


                                                      PricewaterhouseCoopers LLP


Kansas City, Missouri
July 12, 1999


                                                 www.americancentury.com      13


Background Information
- --------------------------------------------------------------------------------

INVESTMENT PHILOSOPHY AND POLICIES

     American  Century offers 38 fixed-income  funds,  ranging from money market
portfolios  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  benchmark  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:

     FLORIDA  MUNICIPAL MONEY MARKET seeks interest income exempt from state and
federal  income  taxes,  as well as the Florida  intangibles  tax, by  investing
primarily in high-quality, short-term Florida municipal securities.

     Investments  in Florida  Municipal  Money  Market are  neither  insured nor
guaranteed by the FDIC or any other  government  agency.  Yields will fluctuate,
and although the fund seeks to preserve the value of your  investment  at $1 per
share, it is possible to lose money by investing in the fund.

LIPPER RANKINGS

     LIPPER INC. is an  independent  mutual fund ranking  service.  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 funds in Lipper's OTHER STATES  TAX-EXEMPT  MONEY MARKET FUNDS category
invest  in  high-quality  municipal  obligations  with  dollar-weighted  average
maturities of less than 90 days.

CREDIT RATING GUIDELINES

     Credit  quality (the  issuer's  financial  strength and the  likelihood  of
timely  payment of  interest  and  principal)  is a key  factor in  fixed-income
investment  analysis.  Credit ratings issued by independent  rating and research
companies such as Standard & Poor's help quantify credit  quality--the  stronger
the issuer,  the higher the credit rating.  In turn,  credit quality and ratings
greatly influence the prices and yields of fixed-income securities--high ratings
mean higher prices and less current income (yield) as compensation for risk.

     But credit ratings are subjective.  They reflect the opinions of the rating
agencies that issue them and are not absolute standards of quality. Furthermore,
high credit ratings do not guarantee good  investment  performance.  They do not
reflect the price  stability  of a municipal  security  when  economic or market
conditions change.

[left margin]

INVESTMENT TEAM LEADERS
   PORTFOLIO MANAGER
      BRYAN KARCHER
MUNICIPAL CREDIT  RESEARCH TEAM
   MANAGER
      STEVEN PERMUT
   MUNICIPAL CREDIT ANALYSTS
      DAVID MOORE
      ROBERT MILLER
      BILL MCCLINTOCK
      TIM BENHAM
      BRAD BODE


14      1-800-345-2021


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 12.

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.

*  TAX-EQUIVALENT  YIELDS show the taxable  yields that  investors  in a federal
income tax bracket would have to earn before taxes to equal the fund's  tax-free
yield.

INVESTMENT TERMS

* BASIS POINT -- a basis point equals one  one-hundredth  of a percentage  point
(or 0.01%). Therefore, 100 basis points equal one percentage point (or 1%).


PORTFOLIO STATISTICS

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

* WEIGHTED  AVERAGE  MATURITY  (WAM) -- a measurement  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.

* 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 MUNICIPAL SECURITIES

* MUNICIPAL COMMERCIAL PAPER (CP) -- high-grade  short-term securities backed by
a line of credit from a bank

* MUNICIPAL NOTES -- securities with maturities of two years or less.

* PUT BONDS -- long-term  securities that can be "put back" (i.e.,  sold at face
value) to a specified buyer at a prearranged date.

*  VARIABLE-RATE  DEMAND NOTES (VRDNS) -- securities  that track market interest
rates and  stabilize  their  market  values  using  periodic  (daily or  weekly)
interest rate adjustments.


                                                 www.americancentury.com      15


Glossary
- --------------------------------------------------------------------------------
                                                                    (Continued)

FUND CLASSIFICATIONS

INVESTMENT OBJECTIVE

     The investment  objective may be based on the fund's objective as stated in
its  prospectus or fund profile,  or the fund's  categorization  by  independent
rating organizations based on its management style.

* CAPITAL  PRESERVATION  -- offers  taxable and tax-free  money market funds for
relative stability of principal and liquidity.

* INCOME -- offers funds that can provide current income and competitive yields,
as well as a strong and stable  foundation and generally lower volatility levels
than stock funds.

* GROWTH & INCOME --  offers  funds  that  emphasize  both  growth  and  income,
provided  by either  dividend-paying  equities  or a  combination  of equity and
fixed-income securities.

* GROWTH -- offers  funds with a focus on  capital  appreciation  and  long-term
growth,  generally providing high return potential with corresponding high price
fluctuation risk.

RISK

     The  classification  of funds  by risk  category  is based on  quantitative
historical  measures  as well as  qualitative  prospective  measures.  It is not
intended to be a precise  indicator of future risk or return levels.  The degree
of risk within each category can vary significantly,  and some fund returns have
historically  been  higher  than  more  aggressive  funds  or  lower  than  more
conservative  funds.  Please be aware that the fund's  category  may change over
time.  Therefore,  it is  important  that you read a fund's  prospectus  or fund
profile carefully before investing to ensure its objectives,  policies, and risk
potential are consistent with your needs.

*  CONSERVATIVE  -- these funds  generally  provide lower return  potential with
either low or minimal price fluctuation risk.

* MODERATE -- these funds  generally  provide  moderate  return  potential  with
moderate price fluctuation risk.

*  AGGRESSIVE  -- these  funds  generally  provide  high return  potential  with
corresponding high price fluctuation risk.


16      1-800-345-2021


[inside back cover]

===============================================================================
INVESTMENT OBJECTIVE - CAPITAL PRESERVATION
===============================================================================

                  RISK LEVEL - CONSERVATIVE

TAXABLE MONEY MARKETS           TAX-FREE MONEY MARKETS

Premium  Capital Reserve        FL Municipal Money Market
Prime Money Market              CA Municipal Money Market
Premium Government Reserve      CA Tax-Free Money Market
Government Agency               Tax-Free Money Market
   Money Market
Capital Preservation

===============================================================================
INVESTMENT OBJECTIVE - INCOME
===============================================================================

                   RISK LEVEL - AGGRESSIVE

TAXABLE BONDS                   TAX-FREE BONDS

Target 2025*                    CA High-Yield Municipal
Target 2020*                    High-Yield Municipal
Target 2015*
Target 2010*
High-Yield
International Bond

                    RISK LEVEL - MODERATE

TAXABLE BONDS                   TAX-FREE BONDS

Long-Term Treasury              CA Long-Term Tax-Free
Target 2005*                    Long-Term Tax-Free
Bond                            CA Insured Tax-Free
Premium Bond

                   RISK LEVEL - CONSERVATIVE

TAXABLE BONDS                   TAX-FREE BONDS

Intermediate-Term Bond          CA Intermediate-Term Tax-Free
Intermediate-Term Treasury      AZ Intermediate-Term Municipal
GNMA                            FL Intermediate-Term Municipal
Inflation-Adjusted Treasury     Intermediate-Term  Tax-Free
Limited-Term Bond               CA Limited-Term  Tax-Free
Target 2000*                    Limited-Term Tax-Free
Short-Term Government
Short-Term Treasury

===============================================================================
INVESTMENT OBJECTIVE - GROWTH AND INCOME
===============================================================================

                     RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY

Small Cap Quantitative
Small Cap Value

                      RISK LEVEL - MODERATE

ASSET ALLOCATION/BALANCED       DOMESTIC EQUITY        SPECIALTY

Strategic Allocation --         Equity Growth          Utilities
   Aggressive                   Equity Index           Real Estate
Balanced                        Tax-Managed Value
Strategic Allocation --         Income & Growth
   Moderate                     Value
Strategic Allocation --         Equity Income
   Conservative

===============================================================================
INVESTMENT OBJECTIVE - GROWTH
===============================================================================

                      RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY                 SPECIALTY              INTERNATIONAL

New Opportunities               Global Gold            Emerging Markets
Giftrust(reg.tm)                                       International Discovery
Vista                                                  International Growth
Heritage                                               Global Growth
Growth
Ultra(reg.tm)
Select

                       RISK LEVEL - MODERATE

SPECIALTY

Global Natural Resources


The investment  objective may be based on the fund's  objective as stated in its
prospectus or fund profile,  or the fund's  categorization by independent rating
organizations based on its management style.

The classification of funds by risk category is based on quantitative historical
measures as well as qualitative prospective measures. It is not intended to be a
precise  indicator  of future risk or return  levels.  The degree of risk within
each category can vary  significantly,  and some fund returns have  historically
been higher than more aggressive  funds or lower than more  conservative  funds.
Please be aware that a fund's  category may change over time.  Therefore,  it is
important  that you read a fund's  prospectus or fund profile  carefully  before
investing to ensure its  objectives,  policies and risk potential are consistent
with your needs.

For a definition of fund categories, see the Glossary.

*  While listed within the Income investment objective,  the Target funds do not
   pay current dividend income.  Income dividends are distributed once a year in
   December. The Target funds are listed in all three risk categories due to the
   dramatic  price  volatility  investors may  experience  during certain market
   conditions.  If held  to  their  target  dates,  however,  they  can  offer a
   conservative, dependable way to invest for a specific time horizon.

Please call  1-800-345-2021  for a prospectus or profile on any American Century
fund.  These  documents  contain  important  information  including  charges and
expenses, and you should read them carefully before you invest or send money.


[back cover]

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

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

WWW.AMERICANCENTURY.COM

INVESTOR RELATIONS
1-800-345-2021 OR 816-531-5575

AUTOMATED INFORMATION LINE
1-800-345-8765

FAX: 816-340-7962

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

BUSINESS, NOT-FOR-PROFIT, EMPLOYER-SPONSORED RETIREMENT PLANS
1-800-345-3533

AMERICAN CENTURY MUNICIPAL TRUST

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.

- --------------------------------------------------------------------------------
American Century Investments                                      BULK RATE
P.O. Box 419200                                               U.S. POSTAGE PAID
Kansas City, MO 64141-6200                                    AMERICAN CENTURY
www.americancentury.com                                           COMPANIES

9907                                                    Funds Distributor, Inc.
SH-ANN-17027                      (c)1999 American Century Services Corporation
<PAGE>
[front cover]
                                                                    MAY 31, 1999

ANNUAL REPORT
- -----------------
AMERICAN CENTURY

    [graphic of stairs]

- --------------------------
FLORIDA INTERMEDIATE-TERM
MUNICIPAL

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


[inside front cover]


Y2K TESTING EFFORTS PAY  DIVIDENDS IN PREPAREDNESS
- --------------------------------------------------------------------------------

Y2K, short for the year 2000,  refers more  specifically to the date change from
December  31,  1999 to January  1, 2000.  This date  change is  significant  for
computers  because  many  were  originally  programmed  to  process  dates  with
two-character years -- 99 instead of 1999.

When the  calendar  rolls  to  2000,  this can  create  problems  for  computers
programmed  this way because they will read the date as "00," and may  interpret
it as 1900. Most companies have been working to reprogram their computer systems
with  four-digit  years.  Reprogramming  is very  labor-intensive  and  requires
testing  to ensure  that  there  are no  errors  and that all lines of code were
successfully changed.

Recognizing  the possible  impact of the Y2K issue,  our  senior-level  Steering
Committee,  programmers,  business  partners  and Y2K  team  have  been  working
diligently to make January 1, 2000 a non-event for American Century investors.

Currently,  all of our computer systems have been modified,  tested and returned
to  production.  We have an ongoing  commitment  to testing our systems with our
vendors and business partners and within the industry throughout the rest of the
year.

In March  and April of this  year,  we  participated  in the  Security  Industry
Association's (SIA) industry-wide test and successfully  processed  transactions
for dates up to and beyond 2000. American Century  transactions with our partner
firms were processed free of Y2K bugs. We also  participated  in the Market Data
Test conducted by the SIA and Financial  Information  Forum in May.  Again,  the
computer scripts were executed successfully with no Y2K-related errors.

In addition  to our testing  schedule,  our Y2K team has  developed  contingency
plans.  These  plans  will  minimize  the  impact on our  investors  and help us
maintain operations in the event of any Y2K-related  incidents.  We will conduct
practice  drills of  contingency  scenarios  during  the rest of 1999 and refine
those  plans to respond  quickly and  effectively  so that the date change is as
seamless as possible  for  investors.  We expect the year 2000 to be business as
usual at American Century.

Year 2000 Readiness Disclosure

[left margin]

FLORIDA INTERMEDIATE-TERM MUNICIPAL
(ACBFX)
- ------------------------------------

Turn to the inside back cover of this  report to see a list of American  Century
funds classified by objective and risk.

AN IMPORTANT MESSAGE

    On March 1, we reorganized our funds under the American Century name. Though
the  venerable  Benham  name is  gone,  your  funds  will  maintain  their  same
disciplined investment management approach.

    James Benham's proven  fixed-income  investment  philosophy,  which provides
investors  a "pure  play" on a sector  of the bond  market,  will  remain.  That
investment practice--now a hallmark of investing at American Century--has helped
our fixed-income funds deliver solid performance over the years.

    In addition, we will continue to build our team of experienced  fixed-income
portfolio managers, which has doubled in size since American Century was formed.

    We look forward to continuing to meet your fixed-income  investment needs in
the tradition you have come to expect.


Our Message to You
- --------------------------------------------------------------------------------
/photo of James E. Stowers III and James E. Stowers, Jr./
James E. Stowers III, seated, with James E. Stowers, Jr.

     We experienced several investment mood swings in the U.S. financial markets
during the year ended May 31, 1999. When we last addressed you in the semiannual
report for American Century Florida Intermediate-Term Municipal, yields had
fallen as the U.S. bond market rallied. The bond gains were spurred by global
economic and financial turmoil. The Federal Reserve (the U.S. central bank) cut
short-term interest rates to bolster a seemingly vulnerable U.S. economy and
help stabilize markets worldwide.

     The Fed's actions  helped turn things  around.  By January  1999,  overseas
economies were  stabilizing,  the U.S.  economy was posting  strong growth,  and
investor  confidence  had rebounded.  As a result,  stocks rallied and U.S. bond
yields generally returned to higher levels, though they remained lower than they
were a year earlier. Municipal bonds, which had underperformed Treasury bonds in
1998, outperformed Treasurys during the first five months of 1999.

     Investors in American  Century  tax-free and municipal funds benefited from
other positive  developments as 1999 unfolded. In March, we consolidated all our
funds under the American  Century  name.  We believe the change makes it simpler
for you to identify your funds.

     We also reclassified all 71 of our funds based on investment goals and risk
levels,  so you can more  easily  choose  the funds  that are  right for you.  A
complete list of American Century funds,  arranged by their new classifications,
is on the inside back cover of this report.

     In  addition,  we enhanced  our Web site  (www.americancentury.com).  There
you'll find daily fund  information -- including  performance  and price data --
market and national news,  and a Forms Center with access to the  most-requested
investor  forms  and  applications.  You  can  also  sign  up  to  receive  fund
prospectuses and shareholder reports electronically.

     Finally, we continued to expand the American Century investment team, which
has  doubled  over the  last  three  years.  We're  committed  to  building  and
maintaining a talented management group.

     As always, we appreciate your continued confidence in American Century.

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        Vice Chairman of the Board and
                                         Chief Executive Officer

[right margin]

               Table of Contents
Report Highlights ..........................................................   2
Market Perspective .........................................................   3
Municipal Credit Review ....................................................   4
FLORIDA INTERMEDIATE-TERM MUNICIPAL
Performance Information ....................................................   5
Management Q&A .............................................................   6
Yields .....................................................................   6
Portfolio at a Glance ......................................................   6
Top Five Sectors ...........................................................   7
Portfolio Composition
by Credit Rating ...........................................................   7
Schedule of Investments ....................................................   8
FINANCIAL STATEMENTS
Statement of Assets and
Liabilities ................................................................  11
Statement of Operations ....................................................  12
Statements of Changes
in Net Assets ..............................................................  13
Notes to Financial
Statements .................................................................  14
Financial Highlights .......................................................  16
Report of Independent
Accountants ................................................................  17
OTHER INFORMATION
Background Information
Investment Philosophy
and Policies ...............................................................  18
Comparative Indices ........................................................  18
Lipper Rankings ............................................................  18
Credit Rating
Guidelines .................................................................  18
Investment Team
Leaders ....................................................................  18
Glossary ...................................................................  19


                                                  www.americancentury.com      1


Report Highlights
- --------------------------------------------------------------------------------

MARKET PERSPECTIVE

*   Municipal  bonds posted  positive  returns overall during the year ended May
    31, 1999,  though most of their gains  occurred in 1998 when interest  rates
    fell.

*   At the beginning of last summer, municipal bonds languished as investors
    worried that strong U.S. economic growth might ignite inflation.

*   In 1999,  better-than-expected  U.S.  economic growth and other  indications
    that higher  inflation and interest  rates might be ahead caused bond prices
    to retrace much of the ground they gained in 1998.

*   Despite that  environment,  municipal bonds benefited from decreased  supply
    and increased demand,  helping them to regain  considerable  ground on their
    Treasury counterparts.

FLORIDA MUNICIPAL CREDIT REVIEW

*   Municipal credit quality remained solid in Florida during the year ended May
    31, 1999.

*   A growing jobs base, a burgeoning  population,  and personal  income  growth
    continued to be the mainstays of the state's credit strength.

*   Florida's  employment  growth rate remained  among the highest in the nation
    during 1998 and may  continue  that trend in 1999.  Although  the effects of
    global  economic  crises  and a  recession  in  Latin  America  have  led to
    manufacturing  layoffs,  expansions  in the  business  services  and finance
    sectors have more than offset those losses.

*   Going  forward,  our overall  outlook for the state's  credit health remains
    generally upbeat.

MANAGEMENT Q&A

*   Florida  Intermediate-Term  Municipal  finished  at the  top  of its  Lipper
    category  for the year,  providing a favorable  return in spite of the sharp
    rise in interest  rates in 1999.  The fund's  long-term  returns are equally
    impressive.

*   We believe that careful  yield-curve  analysis and diligent  credit research
    remained key to the fund's  success.  Buying  securities that we believe are
    undervalued helps enhance the fund's total return prospects and yield.

*   Managing  duration--controlling the portfolio's sensitivity to interest rate
    changes--remained an important element of our overall fund strategy.

*   Looking ahead, we will probably keep the portfolio's sensitivity to interest
    rate changes fairly neutral in light of the uncertain market environment. We
    also plan to concentrate our holdings in bonds maturing in the middle of the
    fund's maturity spectrum--the three- to 10-year area.

[left margin]

          FLORIDA INTERMEDIATE-TERM
              MUNICIPAL (ACBFX)
TOTAL RETURNS:              AS OF 5/31/99
   6 Months                         0.74%*
   1 Year                           4.71%
30-DAY SEC YIELD:                   3.95%
INCEPTION DATE:                   4/11/94
NET ASSETS:                 $44.4 million

* Not annualized.

Investment terms are defined in the Glossary on pages 19-20.


2      1-800-345-2021


Market Perspective from Randall W. Merk
- --------------------------------------------------------------------------------
/photo of Randall W. Merk/
Randall W. Merk, chief investment officer of fixed income

MUNICIPAL BOND PERFORMANCE

     Municipal bonds posted  positive  returns overall during the year ended May
31, 1999,  though most of their gains occurred in 1998 when interest rates fell.
In the first five months of 1999,  tax-free bond prices  generally  declined and
yields rose because of strong economic growth and inflation concerns.

     Short-  and  intermediate-term   municipal  bonds  outperformed   long-term
municipals,  which  are  more  sensitive  to  interest  rate  changes  (see  the
accompanying  bond index returns  table).  Also,  lower-quality  municipal bonds
(those rated BBB or lower) generally outperformed  higher-rated (A to AAA) bonds
as  strong  economic   conditions  caused  the  yield  gap  between  lower-  and
higher-rated bonds to narrow.

ECONOMIC ENGINE SPUTTERS BUT REGAINS POWER

     At the beginning of last summer,  municipal  bonds  languished as investors
worried  that strong U.S.  economic  growth might  ignite  inflation.  That view
changed radically in July 1998, when protracted  economic and financial problems
in Asia and Latin America  threatened to weaken global  economic  growth.  Bonds
rallied as recessionary  expectations  increased.  To stem overseas problems and
boost the U.S. economy, the Federal Reserve (the Fed) lowered short-term U.S.
interest rates three times last fall.

     Winter  brought  another  shift.  The Fed's actions seemed to achieve their
intended result--U.S. economic growth accelerated, while parts of Asia and Latin
America showed signs of stabilizing.  Better-than-expected  U.S. economic growth
and other indications that higher inflation might be ahead caused bond yields to
rise and prices to retrace  much of the ground they gained in 1998.  May brought
word that the Fed was leaning  toward  raising  interest  rates,  which  further
dampened bond investors' moods.

TREASURYS FALTER AS MUNICIPALS GAIN GROUND

     In 1998,  despite  falling  interest  rates,  municipals  were hamstrung by
unfavorable  supply and demand  conditions and lagged  Treasury  securities as a
result. By October,  the difference between municipal and Treasury yields was as
small as it had been in a decade, indicating that Treasury bonds were relatively
expensive and municipal bonds were comparatively undervalued.

     So far in 1999,  however,  municipal bonds benefited from decreased  supply
and  increased  demand,  helping  them to  regain  considerable  ground on their
Treasury  counterparts.  Even after  outperforming  Treasurys in recent  months,
municipal bonds continue to offer attractive  yields on a tax-equivalent  basis.
As of May 31, 1999, an investor in the highest  federal tax bracket could earn a
tax-adjusted  yield of nearly 7.4% on a 10-year  AAA-rated  municipal bond, well
above the 5.6% yield on a 10-Year U.S. Treasury bond.

[right margin]

"BETTER-THAN-EXPECTED U.S. ECONOMIC GROWTH AND OTHER INDICATIONS THAT HIGHER
INFLATION MIGHT BE AHEAD CAUSED BOND YIELDS TO RISE AND PRICES TO RETRACE MUCH
OF THE GROUND THEY GAINED IN 1998."

MUNICIPAL BOND INDEX RETURNS
FOR THE YEAR ENDED MAY 31, 1999
   MERRILL LYNCH 0- TO 3-YEAR
      MUNICIPAL INDEX               4.58%
   LEHMAN BROS. 5-YEAR
      MUNICIPAL GO INDEX            4.90%
   LEHMAN BROS. LONG-TERM
      MUNICIPAL BOND INDEX          4.35%

Source: Bloomberg Financial Markets

[line graph - data below]

SHIFTING MUNICIPAL YIELD CURVES

YEARS TO
MATURITY      5/31/98           11/30/98            5/31/99
1              3.80%              3.19%              3.36%
2              3.95%              3.49%              3.59%
3              4.06%              3.64%              3.80%
4              4.15%              3.76%              3.98%
5              4.20%              3.86%              4.12%
6              4.27%              3.96%              4.22%
7              4.34%              4.05%              4.31%
8              4.41%              4.13%              4.38%
9              4.48%              4.21%              4.46%
10             4.55%              4.29%              4.54%
11             4.62%              4.38%              4.62%
12             4.69%              4.47%              4.70%
13             4.77%              4.56%              4.78%
14             4.84%              4.65%              4.86%
15             4.92%              4.73%              4.95%
16             4.95%              4.77%              4.98%
17             4.98%              4.80%              5.01%
18             5.00%              4.84%              5.04%
19             5.03%              4.87%              5.08%
20             5.05%              4.91%              5.12%
21             5.05%              4.91%              5.12%
22             5.05%              4.91%              5.13%
23             5.05%              4.92%              5.14%
24             5.06%              4.92%              5.15%
25             5.06%              4.93%              5.16%
26             5.06%              4.93%              5.16%
27             5.06%              4.93%              5.16%
28             5.07%              4.94%              5.17%
29             5.07%              4.94%              5.17%
30             5.08%              4.95%              5.18%

Source: Bloomberg Financial Markets


                                                  www.americancentury.com      3


Municipal Credit Review
- --------------------------------------------------------------------------------

CREDIT SNAPSHOT

     Municipal  credit  quality  remained solid in Florida during the year ended
May 31, 1999. A growing jobs base, a burgeoning population,  and personal income
growth continued to be the mainstays of the state's credit strength.

EMPLOYMENT GROWTH CONTINUED . . .

     Florida's  employment  growth rate remained among the highest in the nation
during 1998 and may continue that trend in 1999.  The state posted a robust 4.1%
increase in new jobs last year as Florida's economy continued to evolve from one
narrowly  based on  agriculture  and tourism to one based more on  services  and
foreign trade.  Banking,  exports, and insurance providers are now vibrant parts
of the transformed economy.

     Although  the effects of global  economic  crises and a recession  in Latin
America have led to manufacturing  layoffs,  expansions in the business services
and finance  sectors have more than offset those  losses.  In 1999,  overall job
growth is on track to slow but should  remain well above the  national  average.
This  should  allow  Florida  to remain  one of the  fastest-growing  employment
markets in the nation.

 . . . WHILE FLORIDA'S POPULATION CONTINUED TO SWELL

     The state's favorable climate and affordable housing prices attracted a net
239,000 new residents in 1998, and that figure is on track to be comparably high
in 1999. Despite the swelling  population,  Florida's  unemployment rate of 4.3%
remained  close to national  levels and fell from 4.8% in 1997.  The downside of
such rapid population growth,  however,  has been pressure for additional roads,
schools,  and water systems in what has become the  fourth-largest  state in the
nation.  Personal incomes also continued to rise--income jumped 5.4% in 1998 and
may remain above 4% in 1999.

LOOKING FORWARD

     The state's heavy  reliance on sales tax  revenues,  combined with spending
pressures from growing school-age and elderly  populations,  leaves its finances
particularly vulnerable to an economic slowdown.  Nevertheless,  our outlook for
the  state's  prospects  remains  generally  upbeat.  By  continuing  to  follow
conservative  fiscal practices,  the state's government is helping to ensure its
future will remain  bright  going  forward.  Florida's  low  business  costs and
relatively  relaxed  regulatory  environment  should  also  continue  to make it
attractive to companies looking to expand their operations.

ON THE LEGISLATIVE FRONT

     Earlier this year, the state enacted  legislation that slightly reduced the
Florida  intangibles tax on residents.  Though this  development may have mildly
reduced  the  attractiveness  of  the  state's  municipal   securities  to  some
residents, there has been little discernable impact from a credit standpoint.

[left margin]

"BY CONTINUING TO FOLLOW GENERALLY  CONSERVATIVE  FISCAL PRACTICES,  THE STATE'S
GOVERNMENT IS HELPING TO ENSURE ITS PROSPECTS WILL REMAIN BRIGHT GOING FORWARD.

MUNICIPAL CREDIT
RESEARCH TEAM
   MANAGER
      STEVEN PERMUT
   MUNICIPAL CREDIT ANALYSTS
      DAVID MOORE
      ROBERT MILLER
      BILL MCCLINTOCK
      TIM BENHAM
      BRAD BODE


4      1-800-345-2021


Florida Intermediate-Term Municipal--Performance
- --------------------------------------------------------------------------------

<TABLE>
TOTAL RETURNS AS OF MAY 31, 1999

                   FLORIDA
                INTERMEDIATE-   LEHMAN 5-YEAR   FLORIDA INTERM. MUNICIPAL DEBT FUNDS(2)
               TERM MUNICIPAL      GO INDEX        AVERAGE RETURN    FUND'S RANKING
=====================================================================================
<S>              <C>               <C>              <C>               <C>
6 MONTHS(1)         0.74%           1.42%             0.39%               --
1 YEAR              4.71%           4.90%             3.45%           1 OUT OF 15
=====================================================================================
AVERAGE ANNUAL RETURNS
3 YEARS(3)          6.50%           5.97%             5.33%           1 OUT OF 11
5 YEARS(3)          6.23%           5.91%             5.28%           1 OUT OF 10
LIFE OF FUND(3)     6.42%           5.92%            5.35%(4)         1 OUT OF 10(4)
</TABLE>

The fund's inception date was 4/11/94.

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

(2) According to Lipper Inc., an independent mutual fund ranking service.

(3) Returns and rankings  would have been lower if management  fees had not been
    waived.

(4) Since 4/30/94,  the date nearest the fund's  inception for which return data
    are available.

See pages 18-19 for more information about returns,  the comparative  index, and
Lipper fund rankings.

[mountain graph - data below]

GROWTH OF $10,000 OVER LIFE OF FUND
Value on 5/31/99
Florida Intermediate-Term
   Municipal                    $13,651
Lehman 5-Year GO Index          $13,348

                Florida Intermediate-     Lehman 5-Year
                   Term Municipal           GO Index
DATE                   VALUE                  VALUE
4/30/94               $10,000               $10,000
6/30/94               $10,054                $9,996
9/30/94               $10,173               $10,077
12/31/94              $10,031               $10,044
3/31/95               $10,539               $10,450
6/30/95               $10,811               $10,717
9/30/95               $11,068               $11,010
12/31/95              $11,396               $11,211
3/31/96               $11,338               $11,246
6/30/96               $11,361               $11,295
9/30/96               $11,561               $11,479
12/31/96              $11,812               $11,730
3/31/97               $11,830               $11,711
6/30/97               $12,205               $12,002
9/30/97               $12,514               $12,264
12/31/97              $12,784               $12,490
3/31/98               $12,918               $12,636
6/30/98               $13,094               $12,764
9/30/98               $13,496               $13,115
12/31/98              $13,613               $13,218
3/31/99               $13,699               $13,354
5/31/99               $13,651               $13,348

$10,000 investment made 4/30/94


The graph at left shows the growth of a $10,000  investment over the life of the
fund,  while the graph  below  shows the fund's  year-by-year  performance.  The
Lehman  5-Year  GO Index is  provided  for  comparison  in each  graph.  Florida
Intermediate-Term  Municipal's total returns include operating expenses (such as
transaction  costs and  management  fees) that reduce  returns,  while the total
returns of the index do not. 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.

[bar graph - data below]

ONE-YEAR RETURNS OVER LIFE OF FUND (PERIODS ENDING MAY 31)
            Florida Intermediate-    Lehman 5-Year
               Term Municipal          GO Index
DATE               RETURN               RETURN
5/31/94*           0.93%                0.56%
5/31/95            7.31%                6.89%
5/31/96            4.34%                4.74%
5/31/97            6.63%                6.08%
5/31/98            8.20%                6.95%
5/31/99            4.71%                4.90%

* From 4/30/94 (the date nearest the fund's  inception  for which index data are
  available) to 5/31/94.


                                                  www.americancentury.com      5


Florida Intermediate-Term Municipal--Q&A
- --------------------------------------------------------------------------------
/photo of Ken Salinger/

     An  interview  with  Ken  Salinger,  a  portfolio  manager  on the  Florida
Intermediate-Term Municipal investment team.

HOW DID THE FUND PERFORM FOR THE FISCAL YEAR ENDED MAY 31, 1999?

     Florida  Intermediate-Term  Municipal  finished  at the  top of its  Lipper
category for the year,  providing a favorable  return in spite of the sharp rise
in interest rates in 1999. The fund returned 4.71%,  solidly outpacing the 3.45%
average return of the 15 funds in Lipper Inc.'s Florida  Intermediate  Municipal
Debt Funds category.

     Florida   Intermediate-Term   Municipal's   three-year,    five-year,   and
life-of-fund returns are also the highest in its Lipper group. The fund's return
fell just short of its benchmark; the Lehman 5-Year GO Index returned 4.90%.
(See page 5 for fund performance comparisons.)

     In addition to an impressive  total return  compared with its Lipper peers,
Florida Intermediate-Term Municipal's 30-day SEC yield of 3.95% on May 31, 1999,
compared  favorably  with  the  3.57%  average  SEC  yield of  Lipper's  Florida
intermediate municipal debt fund.

WHY DID FLORIDA INTERMEDIATE-TERM MUNICIPAL CONTINUE TO OUTPACE ITS PEERS?

     We believe that careful  yield-curve  analysis and diligent credit research
remained key to the fund's success.  Our careful analysis of the municipal yield
curve--a  graphic  representation  of the  relationship  between bond yields and
maturities (see page 3 for an  example)--helped  us target maturity areas of the
municipal market that seemed to offer the most attractive  relative value.  With
the help of our seasoned  municipal  credit team, we then looked for undervalued
securities within that maturity range.

HOW DID THAT TRANSLATE TO BETTER PERFORMANCE?

     Buying  securities that we believe are undervalued helps enhance the fund's
total return  potential and yield.  For example,  we've  recently  increased the
portfolio's BBB holdings by adding some hospital bonds.  This has added a slight
amount of credit risk to the overall portfolio, but we think the potential gains
make the additional risk worthwhile.

WHY WERE THOSE SECURITIES SO ATTRACTIVELY PRICED?

     Hospitals and nursing  homes across the nation have come under  competitive
pressure to reduce their costs  because of lower  Medicare  reimbursements  that
resulted from the Balanced  Budget Act. This has kept bond  insurance  companies
from backing hospital bonds-- a sharp reversal from early 1998, when the outlook
was brighter  and  easy-to-get  insurance  made AAA ratings  readily  available.
Overall municipal issuance has tapered off this year because of rising interest

[left margin]

"FLORIDA INTERMEDIATE-TERM MUNICIPAL FINISHED AT THE TOP OF ITS LIPPER CATEGORY
FOR  THE YEAR, PROVIDING A FAVORABLE RETURN IN SPITE OF THE SHARP  RISE IN
INTEREST RATES  IN 1999."

YIELDS AS OF MAY 31, 1999
   30-DAY SEC YIELD                 3.95%
   30-DAY TAX-EQUIVALENT YIELDS
      28.0% TAX BRACKET             5.49%
      31.0% TAX BRACKET             5.72%
      36.0% TAX BRACKET             6.17%
      39.6% TAX BRACKET             6.54%

PORTFOLIO AT A GLANCE
                                  5/31/99           5/31/98
NUMBER OF SECURITIES                59                45
WEIGHTED AVERAGE
   MATURITY                       9.1 YRS           8.5 YRS
AVERAGE DURATION                  5.6 YRS           5.6 YRS
EXPENSE RATIO                      0.51%             0.54%

Investment terms are defined in the Glossary on pages 19-20.


6      1-800-345-2021


Florida Intermediate-Term Municipal--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

rates;  however,  because  most of the hospital  bonds that were issued  carried
lower credit ratings, the available pool of these particular types of municipals
grew.  That, in turn,  has driven  yields on these types of  securities  sharply
higher.

     So we've taken  advantage of the  opportunity.  With the help of our credit
research  team,  we've  been able to add a few hidden  gems that were  backed by
solid credit  stories,  yet offered high yields due to their low credit  rating.
These securities have enhanced the fund's yield and total return prospects.

WHAT ROLE DID DURATION MANAGEMENT PLAY IN FLORIDA INTERMEDIATE-TERM MUNICIPAL'S
SOLID PERFORMANCE?

     Managing duration--controlling the portfolio's sensitivity to interest rate
changes--remained an important element of our overall fund strategy. During much
of 1998, we maintained a slightly long duration  compared with the fund's Lipper
peers. That enhanced returns toward year-end as bond yields fell.

     We've been a bit more  conservative in 1999,  however.  We've kept duration
neutral  to  slightly  long  compared  with  the  average  Florida  intermediate
municipal  debt fund by selling some of the  portfolio's  longer-maturity  bonds
when the market has rallied.  That also helped us shift the  portfolio to a more
bulleted structure,  meaning that the fund's holdings are concentrated in three-
to 10-year municipals.

DO YOU EXPECT TO MAINTAIN THE PORTFOLIO'S SOMEWHAT  CONSERVATIVE DURATION IN THE
NEAR FUTURE?

     That  depends on whether  the outlook  remains  clouded by  uncertainty.  A
recent rise in consumer  prices  fanned the  inflation  spark and  prompted  the
Federal Reserve to raise its short-term  interest rate target by 25 basis points
(0.25%--a  basis  point  equals  0.01%)  in June to slow  economic  growth  to a
more-sustainable, non-inflationary pace.

     The bond market  viewed the Fed's rate  increase as a positive  and rallied
slightly on the news. The  announcement  fueled  expectations  that the Fed will
remain  vigilant on the inflation  front.  The Fed's switch to a neutral  stance
toward rates in the wake of that  tightening,  rather than their  previous  bias
toward a rate increase, was also behind the rally.

     Despite that positive  event,  we've continued to see a wave of strength in
the latest economic  reports.  The big question on which the municipal market is
balancing  right now is whether  economic  growth will remain  overly strong and
spark additional Fed tightenings,  or whether those concerns are too bearish. If
economic growth remains robust, the municipal market may be in store for more of
the kinds of disappointing returns that we've seen so far this year. By the same
token, though, if growth moderates or slows, the market's tone could become more
upbeat and bonds could rally.

WITH THAT OUTLOOK IN MIND, WHAT ARE YOUR PLANS FOR THE PORTFOLIO GOING FORWARD?

     We  currently  plan to use the same  strategies  that  have paid off in the
past:  looking for  attractive  maturity  ranges based on risk and return,  then
working with our credit research team to locate  undervalued  securities  within
those ranges. In addition,  we'll continue to make strategic  adjustments to the
portfolio's duration and maturity structure.

[right margin]

TOP FIVE SECTORS (AS OF 5/31/99)
                            % OF FUND INVESTMENTS
TRANSPORTATION REVENUE                20%
GO                                    19%
HOUSING REVENUE                       10%
ELECTRIC REVENUE                       9%
SALES TAX REVENUE                      8%

TOP FIVE SECTORS (AS OF 11/30/98)
                            % OF FUND INVESTMENTS
TRANSPORTATION REVENUE                30%
SALES TAX REVENUE                     10%
HOUSING REVENUE                        9%
GO                                     8%
ELECTRIC REVENUE                       7%

PORTFOLIO COMPOSITION BY
CREDIT RATING
                            % OF FUND INVESTMENTS
                           AS OF             AS OF
                          5/31/99          11/30/98
AAA                         67%               81%
AA                          21%               13%
A                            5%                3%
BBB                          7%                3%

Ratings provided by Standard & Poor's.  See Credit Rating  Guidelines on page 18
for more information.


                                                  www.americancentury.com      7


Florida Intermediate-Term--Sched. of Investments
- --------------------------------------------------------------------------------

MAY 31, 1999

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
MUNICIPAL SECURITIES--95.1%
FLORIDA--92.0%
               $  300,000  Boca Raton Water and Sewer
                              Rev., 6.40%, 10/1/99,
                              Prerefunded at 101% of Par(1)        $   306,123
                  300,000  Broward County School District
                              GO, 6.75%, 2/15/00                       306,849
                  500,000  Dade County Aviation Rev.,
                              Series 1995 E, 5.50%,
                              10/1/10 (AMBAC)                          529,255
                1,000,000  Dade County Aviation Rev.,
                              Series 1997 A, (Miami
                              International Airport), 5.50%,
                              10/1/02 (FSA)                          1,045,630
                  500,000  Duval County School District GO,
                              6.25%, 8/1/05 (AMBAC)                    533,880
                  500,000  East County Water Control District
                              Rev., 5.375%, 11/1/01 (Asset
                              Guaranty)                                517,455
                  250,000  Escambia County Housing Finance
                              Auth. Single Family Mortgage
                              Rev., 6.00%, 4/1/02
                              (GNMA/FNMA)                              258,298
                  220,000  Escambia County Housing Finance
                              Auth. Single Family Mortgage
                              Rev., Series 1998 A, 4.80%,
                              4/1/06 (GNMA/FNMA)                       221,991
                  350,000  Escambia County Housing Finance
                              Auth. Single Family Mortgage
                              Rev., Series 1998 A, 4.85%,
                              4/1/07 (GNMA/FNMA)                       352,818
                  350,000  Florida Housing Finance Agency
                              Multifamily Housing Rev., 5.35%,
                              6/1/00 (GTEED)                           352,177
                  450,000  Florida Housing Finance Agency
                              Rev., (Williamsburg Village
                              Apartments), 5.60%, 12/1/07
                              (AMBAC)                                  482,040
                  500,000  Florida Housing Finance Agency
                              Rev., (Windwood), 5.65%,
                              12/1/07 (AXA)                            527,800
                1,500,000  Florida Housing Finance Corp.
                              Rev., Series 1999-2,
                              (Homeowner Mortgage), 4.60%,
                              1/1/21 (FSA)                           1,500,750
                1,110,000  Florida Municipal Loan Council
                              Rev., 3.60%, 4/1/02 (MBIA)             1,104,539
                1,000,000  Florida State Board of Education
                              Capital Outlay GO, 4.50%,
                              6/1/24 (MBIA)                            893,030
                1,500,000  Florida State Board of Education
                              Capital Outlay GO, Series
                              1997 A, 5.25%, 6/1/17                  1,512,315
                1,400,000  Florida State Board of Education
                              Capital Outlay GO, Series
                              1998 A, 5.25%, 6/1/13                  1,440,068

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

               $1,000,000  Florida State Board of Education
                              Capital Outlay GO, Series
                              1998 A, 4.75%, 6/1/28                $   918,280
                1,000,000  Florida State Board of Education
                              Capital Outlay GO, Series
                              1999 A, 5.00%, 6/1/12                  1,013,100
                1,000,000  Florida State Board Regent
                              University System Improvement
                              Rev., 4.50%, 7/1/23 (AMBAC)              894,950
                1,205,000  Florida Turnpike Auth. Rev.,
                              (Department of Transportation),
                              Series 1993 A, 5.00%, 7/1/13
                              (FGIC)                                 1,210,278
                  350,000  Gainesville Utilities System Rev.,
                              Series 1996 A, 5.75%,
                              10/1/09                                  385,991
                1,260,000  Hillsborough County Industrial
                              Development Auth. Rev., Series
                              1999 A, (University Community
                              Hospital), 4.90%, 8/15/07(2)           1,252,755
                  400,000  Hillsborough County Port District
                              Special Rev., 6.50%, 6/1/04
                              (FSA)                                    440,120
                  750,000  Indian Trace Community
                              Development District Water
                              Management Special Benefit
                              Assessment, 5.00%, 5/1/10
                              (MBIA)                                   768,555
                  400,000  Indian Trace Community
                              Development District Water
                              Management Special Benefit
                              Assessment, Series 1995 A,
                              5.25%, 5/1/03 (MBIA)                     419,092
                1,250,000  Jacksonville Electric Auth. Rev.,
                              Series 1991-4-1-A, (Bulk
                              Power Supply-Scherer), 6.75%,
                              10/1/00, Prerefunded at
                              101.5% of Par(1)                       1,323,163
                  500,000  Jacksonville Electric Auth. Rev.,
                              Series 1995 6-C, (St. John's
                              River Power), 6.50%, 10/1/01(3)          525,305
                1,250,000  Jacksonville Excise Tax Rev.,
                              5.20%, 10/1/04 (FGIC)                  1,288,725
                1,050,000  Jacksonville Sales Tax Rev., (River
                              City Renaissance), 6.00%,
                              10/1/02 (FGIC)                         1,120,938
                  550,000  Lee County Industrial
                              Development Health Care
                              Facilities Auth. Rev., Series
                              1999 A, (Shell Point Village),
                              5.50%, 11/15/09                          567,116
                  865,000  Lee County Passenger Facility
                              Charge Rev., 4.50%, 10/1/05
                              (AMBAC)                                  873,754
                1,000,000  Lee County Rev., Series 1997 A,
                              5.75%, 10/1/11 (MBIA)(3)               1,094,960
                  650,000  Miami Parking Facilities Rev.,
                              5.25%, 10/1/15 (MBIA)                    672,737

                                              See Notes to Financial Statements


8      1-800-345-2021


Florida Intermediate-Term--Sched. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

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

               $1,000,000   Miami-Dade County Aviation Rev.,
                              Series 1998 A, 5.00%,
                              10/1/06 (FGIC)                       $ 1,032,490
                1,000,000  Miami-Dade County Aviation Rev.,
                              Series 1998 A, 5.25%,
                              10/1/07 (FGIC)                         1,046,310
                1,015,000  Northern Palm Beach County
                              Improvement District Special
                              Assessment, (Unit Development
                              18), 4.90%, 8/1/13 (MBIA)              1,021,648
                  550,000  Orange County Health Facilities
                              Auth. Rev., Series 1996 A,
                              6.00%, 10/1/04 (MBIA)                    598,131
                1,000,000  Orlando and Orange County
                              Expressway Auth. Rev., 5.10%,
                              7/1/04 (FGIC)                          1,045,270
                  450,000  Orlando and Orange County
                              Expressway Auth. Rev., 6.50%,
                              7/1/11 (FGIC)                            522,914
                1,050,000  Orlando Utilities Commission
                              Water & Electric Rev., Series
                              1994 A, 5.00%, 10/1/11                 1,065,068
                  500,000  Orlando Utilities Commission
                              Water & Electric Rev., 5.70%,
                              10/1/04                                  539,365
                1,500,000  Palm Beach County Criminal
                              Justice Facilities Rev., 5.375%,
                              6/1/07 (FGIC)                          1,600,410
                  700,000  Pembroke Pines Capital
                              Improvement Rev., 4.625%,
                              12/1/13 (AMBAC)                          681,590
                  500,000  Pensacola Airport Rev., Series
                              1997 B, 5.40%, 10/1/07
                              (MBIA)                                   529,300
                  300,000  Pensacola Airport Rev., Series
                              1998 A, 6.00%, 10/1/01
                              (MBIA)                                   314,430
                  360,000  Pinellas County Educational
                              Facilities Auth. Rev., (Barry
                              University), 4.45%, 10/1/01              362,408
                  430,000  Pinellas County Educational
                              Facilities Auth. Rev., (Barry
                              University), 4.75%, 10/1/05              431,376
                  450,000  Pinellas County Educational
                              Facilities Auth. Rev., (Barry
                              University), 4.85%, 10/1/06              451,629
                  300,000  Plantation Health Facilities Auth.
                              Rev., (Covenant Village of
                              Florida Inc.), 4.45%, 12/1/04            299,346
                  300,000  Plantation Health Facilities Auth.
                              Rev., (Covenant Village of Florida
                              Inc.), 4.55%, 12/1/05                    299,415

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

               $  300,000  Plantation Health Facilities Auth.
                              Rev., (Covenant Village of Florida
                              Inc.), 4.70%, 12/1/07                $   298,191
                1,000,000  Polk County Housing Finance
                              Auth. Multi-Family Housing Rev.,
                              Series 1997 A, (Winter Oaks
                              Apartments), 5.25%, 7/1/07
                              (FNMA)(3)                              1,041,370
                  300,000  Reedy Creek Improvement District
                              Utility Rev., Series 1991-1,
                              6.25%, 10/1/01, Prerefunded
                              at 101% of Par (MBIA)(1)                 319,989
                  400,000  St. Cloud Utility Rev., 6.40%,
                              8/1/06 (MBIA)                            428,423
                  500,000  Volusia County School District GO,
                              6.20%, 8/1/03 (FGIC)                     533,460
                                                                   -----------
                                                                    41,117,370
                                                                   -----------
PUERTO RICO--3.1%
                1,350,000  Puerto Rico Commonwealth GO,
                              5.00%, 7/1/04                          1,401,812
                                                                   -----------
TOTAL MUNICIPAL SECURITIES                                          42,519,182
                                                                   -----------
   (Cost $42,012,088)

SHORT-TERM MUNICIPAL SECURITIES--4.9%
                  900,000  Martin County Pollution Control
                              Rev., (Florida Power & Light Co.),
                              VRDN, 3.30%, 6/1/99                      900,000
                1,300,000  Pinellas County Health Facilities
                              Auth. Rev., (Pooled Hospital
                              Loan Program), VRDN, 3.40%,
                              6/1/99                                 1,300,000
                                                                   -----------
TOTAL SHORT-TERM MUNICIPAL SECURITIES                                2,200,000
                                                                   -----------
   (Cost $2,200,000)

TOTAL INVESTMENT SECURITIES--100.0%                                $44,719,182
                                                                   ===========
   (Cost $44,212,088)

FUTURES CONTRACTS
                                        Underlying Face
     Purchased      Expiration Date     Amount at Value     Unrealized Gain
- ----------------------------------------------------------------------------
 8 U.S. Treasury       September
     10 Year             1999
   Note Futures                            $892,250              $190
                                        ===============    =================


                                                  www.americancentury.com      9


Florida Intermediate-Term--Sched. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

NOTES TO SCHEDULE OF INVESTMENTS

AMBAC = AMBAC Assurance Corporation

AXA = AXA Insurance Co.

FGIC = Financial Guaranty Insurance Co.

FNMA = Federal National Mortgage Association

FSA = Financial Security Assurance Inc.

GNMA = Government National Mortgage Association

GO = General Obligation

GTEED = Connecticut General Life Guaranty Agreement

MBIA = MBIA Insurance Corp.

VRDN = Variable Rate Demand Note.  Interest  reset date is indicated and used in
calculating the weighted average portfolio maturity. Rate shown is effective May
31, 1999.

(1) Escrowed  to  maturity  in U.S.  government  securities  or state  and local
    securities.

(2) When-issued security.

(3) Security, or a portion thereof, has been segregated at the custodian bank or
    broker for a when-issued security and futures contracts.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* the principal amount of each investment

* the market value of each investment

* the percentage of investments in each state

* the percent and dollar breakdown of each investment category

                                              See Notes to Financial Statements


10      1-800-345-2021


Statement of Assets and Liabilities
- --------------------------------------------------------------------------------

MAY 31, 1999

ASSETS
Investment securities, at value
(identified cost of $44,212,088)
(Note 3) ...................................................         $44,719,182
Investment in affiliated money
market fund (Note 2) .......................................              12,103
Receivable for investments sold ............................           1,003,000
Receivable for variation margin
on futures contracts .......................................                 190
Interest receivable ........................................             636,673
                                                                     -----------
                                                                      46,371,148
                                                                     -----------

LIABILITIES
Disbursements in excess
of demand deposit cash .....................................             698,837
Payable for investments purchased ..........................           1,257,866
Dividends payable ..........................................              17,034
Accrued management fees (Note 2) ...........................              18,700
Payable for trustees' fees and expenses ....................                 119
                                                                     -----------
                                                                       1,992,556
                                                                     -----------
Net Assets .................................................         $44,378,592
                                                                     ===========

CAPITAL SHARES
Outstanding (unlimited number
of shares authorized) ......................................           4,225,221
                                                                     ===========
Net Asset Value Per Share ..................................         $     10.50
                                                                     ===========

NET ASSETS CONSIST OF:
Capital paid in ............................................         $43,829,816
Accumulated undistributed net
realized gain on investments ...............................              41,492
Net unrealized appreciation
on investments (Note 3) ....................................             507,284
                                                                     -----------

                                                                     $44,378,592
                                                                     ===========

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF ASSETS AND  LIABILITIES--This  statement details
what the fund owns (assets),  what it owes (liabilities),  and its net assets as
of the last day of the period.  If you subtract  what the fund owes from what it
owns, you get the fund's net assets.  The net assets divided by the total number
of shares  outstanding  gives you the price of an individual  share,  or the net
asset value per share.

NET ASSETS are also broken down by capital (money invested by shareholders); and
net gains earned on investment  activity but not yet paid to shareholders or net
losses on investment  activity (known as realized gains or losses);  and finally
gains or losses  on  securities  still  owned by the fund  (known as  unrealized
appreciation or depreciation).  This breakdown tells you the value of net assets
that are performance-related,  such as investment gains or losses, and the value
of net  assets  that  are  not  related  to  performance,  such  as  shareholder
investments and redemptions.

See Notes to Financial Statements


                                                 www.americancentury.com      11


Statement of Operations
- --------------------------------------------------------------------------------

YEAR ENDED MAY 31, 1999

INVESTMENT INCOME
Income:
Interest .................................................          $ 1,637,704
                                                                    -----------
Expenses (Note 2):
Management fees ..........................................              177,067
Trustees' fees and expenses ..............................                3,339
                                                                    -----------
                                                                        180,406
                                                                    -----------
Net investment income ....................................            1,457,298
                                                                    -----------

REALIZED AND UNREALIZED
GAIN (LOSS) ON INVESTMENTS
(NOTE 3)
Net realized gain on investments .........................              290,688
Change in net unrealized
appreciation on investments ..............................             (239,507)
                                                                    -----------
Net realized and unrealized
gain on investments ......................................               51,181
                                                                    -----------
Net Increase in Net Assets
Resulting from Operations ................................          $ 1,508,479
                                                                    ===========

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF  OPERATIONS--This  statement breaks down how the
fund's  net  assets  changed  during  the  period  as a  result  of  the  fund's
operations.  It tells you how much money the fund made or lost after taking into
account income,  fees and expenses,  and investment gains or losses. It does not
include shareholder transactions and distributions.

Fund OPERATIONS include:

* interest income earned from investments

* management fees and other expenses

* gains or losses from selling investments (known as realized gains or losses)

* gains or losses on current fund holdings (known as unrealized appreciation or
  depreciation)

                                              See Notes to Financial Statements


12      1-800-345-2021


Statements of Changes in Net Assets
- --------------------------------------------------------------------------------

YEARS ENDED MAY 31, 1999 AND MAY 31, 1998

Increase in Net Assets                                1999              1998

OPERATIONS
Net investment income ....................      $  1,457,298       $  1,042,897
Net realized gain on investments .........           290,688            397,759
Change in net unrealized
appreciation on investments ..............          (239,507)           439,483
                                                ------------       ------------
Net increase in net assets
resulting from operations ................         1,508,479          1,880,139
                                                ------------       ------------

DISTRIBUTIONS TO
SHAREHOLDERS
From net investment income ...............        (1,457,298)        (1,042,897)
From net realized gains on
investment transactions ..................          (381,472)          (316,935)
                                                ------------       ------------
Decrease in net assets from
distributions to shareholders ............        (1,838,770)        (1,359,832)
                                                ------------       ------------

CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold ................        36,435,233         28,435,575
Proceeds from reinvestment
of distributions .........................         1,056,236            976,870
Payments for shares redeemed .............       (22,387,798)       (16,840,155)
                                                ------------       ------------
Net increase in net assets
from capital share transactions ..........        15,103,671         12,572,290
                                                ------------       ------------
Net increase in net assets ...............        14,773,380         13,092,597

NET ASSETS
Beginning of period ......................        29,605,212         16,512,615
                                                ------------       ------------
End of period ............................      $ 44,378,592       $ 29,605,212
                                                ============       ============

TRANSACTIONS IN SHARES
OF THE FUND
Sold .....................................         3,423,113          2,709,826
Issued in reinvestment
of distributions .........................            99,204             92,680
Redeemed .................................        (2,100,988)        (1,596,282)
                                                ------------       ------------
Net increase .............................         1,421,329          1,206,224
                                                ============       ============

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF CHANGES IN NET ASSETS--These statements show how
the fund's net assets  changed over the past two reporting  periods.  It details
how much a fund grew or shrank as a result of:

* operations--a summary of the Statement of Operations from the previous page
for the most recent period

* distributions--income and gains distributed to shareholders

* capital share transactions--shareholders' purchases, reinvestments, and
redemptions

Net  assets  at the  beginning  of  the  period  plus  the  sum  of  operations,
distributions  to  shareholders  and capital  share  transactions  result in net
assets at the end of the period.

See Notes to Financial Statements


                                                 www.americancentury.com      13


Notes to Financial Statements
- --------------------------------------------------------------------------------

MAY 31, 1999

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    ORGANIZATION -- American  Century  Municipal Trust (the trust) is registered
under the Investment  Company Act of 1940 as an open-end  management  investment
company. Florida Intermediate-Term Municipal Fund (the fund) is one of the eight
funds issued by the trust. The fund is  non-diversified  under the 1940 Act. Its
investment  objective is to seek as high a level of current  income  exempt from
federal  income taxes as is consistent  with prudent  investment  management and
conservation of  shareholders'  capital.  The fund invests  primarily in Florida
municipal  obligations.  The fund concentrates its investments in a single state
and  therefore  may have more  exposure to credit  risk  related to the state of
Florida than a fund with a broader geographical  diversification.  The following
significant  accounting  policies  are in  accordance  with  generally  accepted
accounting principles; these principles may require the use of estimates by fund
management.

    SECURITY  VALUATIONS  --  Portfolio  securities  held by the fund 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 Trustees.

    SECURITY  TRANSACTIONS -- Security  transactions are accounted for as of the
trade date. 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.

    INCOME  TAX  STATUS  -- It is  the  fund's  policy  to  distribute  all  net
investment  income  and net  realized  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.  For the year ended May 31,  1999,  100%
(unaudited) of the fund's  distributions  from net  investment  income have been
designated as exempt from federal income tax.

    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  realized  gains  and  losses  for  financial
statement  and tax purposes  and may result in  reclassification  among  certain
capital accounts.

    FUTURES  CONTRACTS  -- The  fund  may buy and  sell  interest  rate  futures
contracts  relating to debt  securities  and write and buy put and call  options
relating  to  interest  rate  futures  contracts.  The fund may use  futures and
options  transactions  to maintain cash reserves while remaining fully invested,
to  facilitate  trading,  to  reduce  transaction  costs,  or to  pursue  higher
investment  returns when a futures contract is priced more attractively than its
underlying  security  or  index.  One of the  risks  of  entering  into  futures
contracts may include the possibility  that the changes in value of the contract
may not correlate with the changes in value of the underlying  securities.  Upon
entering into a futures contract, the fund is required to deposit either cash or
securities  in an amount equal to a certain  percentage  of the  contract  value
(initial margin).  Subsequent  payments  (variation margin) are made or received
daily,  in cash, by the fund. The variation  margin is equal to the daily change
in the contract  value and is recorded as an unrealized  gain or loss.  The fund
recognizes a realized gain or loss when the contract is closed or expires.

    ADDITIONAL  INFORMATION  -- Funds  Distributor,  Inc.  (FDI) is the  trust's
distributor. Certain officers of FDI are also officers of the trust.

- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

    The trust has entered  into a Management  Agreement  with  American  Century
Investment  Management,  Inc.  (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 for brokerage,
taxes,  portfolio insurance,  interest,  fees and expenses of those Trustees 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 calculated daily and paid monthly. It consists of an Investment
Category  Fee based on the average net assets of the funds in a specific  fund's
investment category and a Complex Fee based on the average net assets of all the
funds  managed by ACIM.  The rates for the  Investment  Category  Fee range from
0.1625%  to 0.2800%  and the rates for the  Complex  Fee range  from  0.2900% to
0.3100%.  For the year ended May 31, 1999, the effective  annual  management fee
was 0.51%.

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

    As of May 31,  1999,  the fund had  invested  $12,103  in shares of  Florida
Municipal Money Market Fund (Money Market Fund),  which is also managed by ACIM.
The terms of the transaction were identical to those with  non-related  entities
except that, to avoid  duplicative  management  fees,  the fund did not pay ACIM
management fees with respect to assets invested in the Money Market Fund.


14      1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

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

    Purchases  and sales of municipal  debt  obligations,  excluding  short-term
investments, totaled $66,440,658 and $53,521,904, respectively.

    As of May 31, 1999, accumulated net unrealized appreciation for the fund was
$507,284,  which consisted of unrealized appreciation of $634,768 and unrealized
depreciation  of $127,484.  The aggregate cost of investments for federal income
tax purposes was the same as the cost for financial reporting purposes.

- --------------------------------------------------------------------------------
4. BANK LOANS

    Effective  December  18,  1998,  the fund,  along with  certain  other funds
managed by ACIM,  entered  into an  unsecured  $570,000,000  bank line of credit
agreement  with  Chase  Manhattan  Bank.  Borrowings  under the  agreement  bear
interest at the Federal  Funds rate plus  0.40%.  The fund may borrow  money for
temporary or emergency  purposes to fund shareholder  redemptions.  The fund did
not borrow from the line  during the period  December  18, 1998  through May 31,
1999.

- --------------------------------------------------------------------------------
5. FUND EVENTS

  The following name change became effective March 1, 1999:

           =====================================================================
           NEW NAME                      FORMER NAME
           =====================================================================

  FUND:    Florida Intermediate-Term     American Century - Benham Florida
           Municipal Fund                Intermediate-Term Municipal Fund


                                                 www.americancentury.com      15


Florida Intermediate-Term--Financial Highlights
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED MAY 31

                                              1999         1998         1997         1996         1995
PER-SHARE DATA
<S>                                      <C>          <C>          <C>          <C>          <C>
Net Asset Value, Beginning of Period ... $    10.56   $    10.34   $    10.18   $    10.30   $    10.11
                                         ----------   ----------   ----------   ----------   ----------
Income From Investment Operations
Net Investment Income ..................       0.44         0.45         0.46         0.52         0.52
Net Realized and Unrealized Gain
(Loss) on Investment Transactions ......       0.05         0.38         0.20        (0.08)        0.19
                                         ----------   ----------   ----------   ----------   ----------
Total From Investment Operations .......       0.49         0.83         0.66         0.44         0.71
                                         ----------   ----------   ----------   ----------   ----------
Distributions
From Net Investment Income .............      (0.44)       (0.45)       (0.46)       (0.52)       (0.52)
From Net Realized Capital Gains ........      (0.11)       (0.16)       (0.04)       (0.04)        --
                                         ----------   ----------   ----------   ----------   ----------
Total Distributions ....................      (0.55)       (0.61)       (0.50)       (0.56)       (0.52)
                                         ----------   ----------   ----------   ----------   ----------
Net Asset Value, End of Period ......... $    10.50   $    10.56   $    10.34   $    10.18   $    10.30
                                         ==========   ==========   ==========   ==========   ==========
Total Return(1) ........................       4.71%        8.20%        6.63%        4.34%        7.31%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ..................       0.51%        0.54%        0.65%        0.13%        --
Ratio of Operating Expenses
to Average Net Assets
(Before Expense Waiver) ................       0.51%        0.58%        0.86%        0.88%        1.09%
Ratio of Net Investment Income
to Average Net Assets ..................       4.13%        4.28%        4.42%        5.05%        5.23%
Ratio of Net Investment Income to
Average Net Assets
(Before Expense Waiver) ................       4.13%        4.24%        4.21%        4.30%        4.14%
Portfolio Turnover Rate ................        154%         154%          82%          66%          37%
Net Assets, End of Period
(in thousands) ......................... $   44,379   $   29,605   $   16,513   $   10,319   $    9,532
</TABLE>

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

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL  HIGHLIGHTS--This  statement itemizes current period
activity and  statistics  and provide  comparison  data for the last five fiscal
years.

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income

* income distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

* portfolio turnover rate -- the percentage of the portfolio that was replaced
  during the period

                                              See Notes to Financial Statements


16      1-800-345-2021


Report of Independent Accountants
- --------------------------------------------------------------------------------

To  the  Board  of  Trustees  of  the  American  Century   Municipal  Trust  and
Shareholders of the Florida Intermediate-Term Municipal Fund:

In our opinion, the accompanying statement of assets and liabilities,  including
the schedule of  investments,  and the related  statements of operations  and of
changes  in net assets  and the  financial  highlights  present  fairly,  in all
material  respects,  the  financial  position of the  Florida  Intermediate-Term
Municipal Fund (formerly the American Century - Benham Florida Intermediate-Term
Municipal Fund) (one of the eight funds in the American Century Municipal Trust,
hereafter  referred  to as the "Fund") at May 31,  1999,  and the results of its
operations  for the year then  ended,  the  changes  in its net  assets  and the
financial  highlights  for each of the two years in the period  then  ended,  in
conformity  with  generally  accepted  accounting  principles.  These  financial
statements  and  financial  highlights  (hereafter  referred  to  as  "financial
statements") are the responsibility of the Fund's management; our responsibility
is to express an opinion on these financial  statements based on our audits. The
financial  highlights  for each of the three  years in the period  ended May 31,
1997,  were  audited  by other  auditors,  whose  report,  dated  July 7,  1997,
expressed an unqualified opinion on those statements. We conducted our audits of
these  financial  statements  in accordance  with  generally  accepted  auditing
standards, which require that we plan and perform the audit to obtain reasonable
assurance   about  whether  the  financial   statements  are  free  of  material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the  amounts  and  disclosures  in  the  financial  statements,   assessing  the
accounting  principles  used and significant  estimates made by management,  and
evaluating the overall  financial  statement  presentation.  We believe that our
audits,   which  included   confirmation  of  securities  at  May  31,  1999  by
correspondence  with the custodian and brokers,  provide a reasonable  basis for
the opinion expressed above.


                                                      PricewaterhouseCoopers LLP


Kansas City, Missouri
July 12, 1999


                                                 www.americancentury.com      17


Background Information
- --------------------------------------------------------------------------------

INVESTMENT PHILOSOPHY AND POLICIES

     American  Century offers 38 fixed-income  funds,  ranging from money market
portfolios  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:

     FLORIDA INTERMEDIATE-TERM  MUNICIPAL invests primarily in intermediate-term
Florida  municipal  securities with  maturities of four or more years.  The fund
maintains a weighted average maturity of 5-10 years.

     Depending  on your tax  status,  investment  income  may be  subject to the
federal  alternative  minimum  tax.  Capital  gains are not exempt from  federal
income tax.

     Fund shares are intended to be exempt from the Florida intangibles tax.

COMPARATIVE INDICES

     The  following  indices  are  used  in  the  report  for  fund  performance
comparisons. They are not investment products available for purchase.

     The MERRILL LYNCH 0- TO 3-YEAR  MUNICIPAL INDEX has an average  maturity of
approximately two years. The bonds in the index have an average rating of AA1.

     The LEHMAN BROTHERS  FIVE-YEAR  MUNICIPAL  GENERAL  OBLIGATION INDEX has an
average  maturity of five years. The bonds are rated BBB or higher by Standard &
Poor's, with an average rating of AA.

     The  LEHMAN  BROTHERS  LONG-TERM   MUNICIPAL  BOND  INDEX  is  composed  of
investment-grade municipal bonds with maturities greater than 22 years.

LIPPER RANKINGS

     LIPPER INC. is an independent mutual fund ranking service. 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 funds in Lipper's  FLORIDA  INTERMEDIATE  MUNICIPAL DEBT FUNDS category
invest at least 65% of their  assets in  municipal  debt  issues that are exempt
from taxation in Florida, with dollar-weighted average maturities of 5-10 years

CREDIT RATING GUIDELINES

     Credit  ratings  are  issued  by  independent  research  companies  such as
Standard  & Poor's  and  Moody's.  Ratings  are based on an  issuer's  financial
strength and ability to pay interest and principal in a timely manner.

     It's important to note that credit ratings are  subjective,  reflecting the
opinions of the rating agencies; they are not absolute standards of quality.

     Securities  rated AAA,  AA, A, or BBB are  considered  "investment  grade,"
meaning they're relatively safe from default.

[left margin]

INVESTMENT TEAM LEADERS
   PORTFOLIO MANAGERS
     KEN SALINGER
     DAVE MACEWEN
   MUNICIPAL CREDIT RESEARCH DIRECTOR
     STEVEN PERMUT


18      1-800-345-2021


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 16.

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 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.

*  TAX-EQUIVALENT  YIELDS show the taxable  yields that  investors  in a federal
income tax bracket would have to earn before taxes to equal the fund's  tax-free
yield.

INVESTMENT TERMS

* BASIS POINT -- a basis point equals one  one-hundredth  of a percentage  point
(or 0.01%). Therefore, 100 basis points equal one percentage point (or 1%).

* YIELD CURVE -- a graphic  representation of the relationship  between maturity
and yield for  fixed-income  securities.  Yield curve  graphs  plot  lengthening
maturities along the horizontal axis and rising yields along the vertical axis.

PORTFOLIO STATISTICS

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

* WEIGHTED  AVERAGE  MATURITY  (WAM) -- a measurement  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.

* 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.

* 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's account.
(See Note 2 in the Notes to Financial Statements.)

TYPES OF MUNICIPAL SECURITIES

* COPS/LEASES -- securities issued to finance public property improvements (such
as city halls and police  stations) and  equipment  purchases.  Certificates  of
participation  represent long-term debt obligations,  while leases have a higher
risk profile than GOs because they require annual appropriation.

* GO BONDS -- general  obligation  securities  backed by the taxing power of the
issuer.

* LAND-SECURED  BONDS -- securities such as Mello-Roos  bonds and 1915-Act bonds
that are issued to finance real estate development projects.


                                                 www.americancentury.com      19


Glossary
- --------------------------------------------------------------------------------
                                                                    (Continued)

* PREREFUNDED BONDS/ETM BONDS --securities refinanced or escrowed to maturity by
the issuer because of their premium coupons (higher-than-market interest rates).
These  bonds  tend to have  higher  credit  ratings  because  they are backed by
Treasury securities.

* REVENUE  BONDS  --securities  backed by  revenues  from sales  taxes or from a
specific project, system, or facility (such as a hospital,  electric utility, or
water system).

FUND CLASSIFICATIONS

INVESTMENT OBJECTIVE

     The investment  objective may be based on the fund's objective as stated in
its  prospectus or fund profile,  or the fund's  categorization  by  independent
rating organizations based on its management style.

* CAPITAL  PRESERVATION  -- offers  taxable and tax-free  money market funds for
relative stability of principal and liquidity.

* INCOME -- offers funds that can provide current income and competitive yields,
as well as a strong and stable  foundation and generally lower volatility levels
than stock funds.

* GROWTH & INCOME --  offers  funds  that  emphasize  both  growth  and  income,
provided  by either  dividend-paying  equities  or a  combination  of equity and
fixed-income securities.

* GROWTH -- offers  funds with a focus on  capital  appreciation  and  long-term
growth,  generally providing high return potential with corresponding high price
fluctuation risk.

RISK

     The  classification  of funds  by risk  category  is based on  quantitative
historical  measures  as well as  qualitative  prospective  measures.  It is not
intended to be a precise  indicator of future risk or return levels.  The degree
of risk within each category can vary significantly,  and some fund returns have
historically  been  higher  than  more  aggressive  funds  or  lower  than  more
conservative  funds.  Please be aware that the fund's  category  may change over
time.  Therefore,  it is  important  that you read a fund's  prospectus  or fund
profile carefully before investing to ensure its objectives,  policies, and risk
potential are consistent with your needs.

*  CONSERVATIVE  -- these funds  generally  provide lower return  potential with
either low or minimal price fluctuation risk.

* MODERATE -- these funds  generally  provide  moderate  return  potential  with
moderate price fluctuation risk.

*  AGGRESSIVE  -- these  funds  generally  provide  high return  potential  with
corresponding high price fluctuation risk.


20      1-800-345-2021


[inside back cover]

===============================================================================
INVESTMENT OBJECTIVE - CAPITAL PRESERVATION
===============================================================================

                  RISK LEVEL - CONSERVATIVE

TAXABLE MONEY MARKETS           TAX-FREE MONEY MARKETS

Premium  Capital Reserve        FL Municipal Money Market
Prime Money Market              CA Municipal Money Market
Premium Government Reserve      CA Tax-Free Money Market
Government Agency               Tax-Free Money Market
   Money Market
Capital Preservation

===============================================================================
INVESTMENT OBJECTIVE - INCOME
===============================================================================

                   RISK LEVEL - AGGRESSIVE

TAXABLE BONDS                   TAX-FREE BONDS

Target 2025*                    CA High-Yield Municipal
Target 2020*                    High-Yield Municipal
Target 2015*
Target 2010*
High-Yield
International Bond

                    RISK LEVEL - MODERATE

TAXABLE BONDS                   TAX-FREE BONDS

Long-Term Treasury              CA Long-Term Tax-Free
Target 2005*                    Long-Term Tax-Free
Bond                            CA Insured Tax-Free
Premium Bond

                   RISK LEVEL - CONSERVATIVE

TAXABLE BONDS                   TAX-FREE BONDS

Intermediate-Term Bond          CA Intermediate-Term Tax-Free
Intermediate-Term Treasury      AZ Intermediate-Term Municipal
GNMA                            FL Intermediate-Term Municipal
Inflation-Adjusted Treasury     Intermediate-Term  Tax-Free
Limited-Term Bond               CA Limited-Term  Tax-Free
Target 2000*                    Limited-Term Tax-Free
Short-Term Government
Short-Term Treasury

===============================================================================
INVESTMENT OBJECTIVE - GROWTH AND INCOME
===============================================================================

                     RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY

Small Cap Quantitative
Small Cap Value

                      RISK LEVEL - MODERATE

ASSET ALLOCATION/BALANCED       DOMESTIC EQUITY        SPECIALTY

Strategic Allocation --         Equity Growth          Utilities
   Aggressive                   Equity Index           Real Estate
Balanced                        Tax-Managed Value
Strategic Allocation --         Income & Growth
   Moderate                     Value
Strategic Allocation --         Equity Income
   Conservative

===============================================================================
INVESTMENT OBJECTIVE - GROWTH
===============================================================================

                      RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY                 SPECIALTY              INTERNATIONAL

New Opportunities               Global Gold            Emerging Markets
Giftrust(reg.tm)                                       International Discovery
Vista                                                  International Growth
Heritage                                               Global Growth
Growth
Ultra(reg.tm)
Select

                       RISK LEVEL - MODERATE

SPECIALTY

Global Natural Resources


The investment  objective may be based on the fund's  objective as stated in its
prospectus or fund profile,  or the fund's  categorization by independent rating
organizations based on its management style.

The classification of funds by risk category is based on quantitative historical
measures as well as qualitative prospective measures. It is not intended to be a
precise  indicator  of future risk or return  levels.  The degree of risk within
each category can vary  significantly,  and some fund returns have  historically
been higher than more aggressive  funds or lower than more  conservative  funds.
Please be aware that a fund's  category may change over time.  Therefore,  it is
important  that you read a fund's  prospectus or fund profile  carefully  before
investing to ensure its  objectives,  policies and risk potential are consistent
with your needs.

For a definition of fund categories, see the Glossary.

*  While listed within the Income investment objective,  the Target funds do not
   pay current dividend income.  Income dividends are distributed once a year in
   December. The Target funds are listed in all three risk categories due to the
   dramatic  price  volatility  investors may  experience  during certain market
   conditions.  If held  to  their  target  dates,  however,  they  can  offer a
   conservative, dependable way to invest for a specific time horizon.

Please call  1-800-345-2021  for a prospectus or profile on any American Century
fund.  These  documents  contain  important  information  including  charges and
expenses, and you should read them carefully before you invest or send money.


[back cover]

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

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

WWW.AMERICANCENTURY.COM

INVESTOR RELATIONS
1-800-345-2021 OR 816-531-5575

AUTOMATED INFORMATION LINE
1-800-345-8765

FAX: 816-340-7962

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

BUSINESS, NOT-FOR-PROFIT, EMPLOYER-SPONSORED RETIREMENT PLANS
1-800-345-3533

AMERICAN CENTURY MUNICIPAL TRUST

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.

- --------------------------------------------------------------------------------
American Century Investments                                      BULK RATE
P.O. Box 419200                                               U.S. POSTAGE PAID
Kansas City, MO 64141-6200                                    AMERICAN CENTURY
www.americancentury.com                                           COMPANIES

9907                                                    Funds Distributor, Inc.
SH-ANN-17029                      (c)1999 American Century Services Corporation
<PAGE>
[front cover]
                                                                    MAY 31, 1999

ANNUAL REPORT
- -----------------
AMERICAN CENTURY

    [graphic of stairs]

- -----------------------
TAX-FREE MONEY MARKET

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


[inside front cover]


Y2K TESTING EFFORTS PAY  DIVIDENDS IN PREPAREDNESS
- --------------------------------------------------------------------------------

Y2K, short for the year 2000,  refers more  specifically to the date change from
December  31,  1999 to January  1, 2000.  This date  change is  significant  for
computers  because  many  were  originally  programmed  to  process  dates  with
two-character years -- 99 instead of 1999.

When the  calendar  rolls  to  2000,  this can  create  problems  for  computers
programmed  this way because they will read the date as "00," and may  interpret
it as 1900. Most companies have been working to reprogram their computer systems
with  four-digit  years.  Reprogramming  is very  labor-intensive  and  requires
testing  to ensure  that  there  are no  errors  and that all lines of code were
successfully changed.

Recognizing  the possible  impact of the Y2K issue,  our  senior-level  Steering
Committee,  programmers,  business  partners  and Y2K  team  have  been  working
diligently to make January 1, 2000 a non-event for American Century investors.

Currently,  all of our computer systems have been modified,  tested and returned
to  production.  We have an ongoing  commitment  to testing our systems with our
vendors and business partners and within the industry throughout the rest of the
year.

In March  and April of this  year,  we  participated  in the  Security  Industry
Association's (SIA) industry-wide test and successfully  processed  transactions
for dates up to and beyond 2000. American Century  transactions with our partner
firms were processed free of Y2K bugs. We also  participated  in the Market Data
Test conducted by the SIA and Financial  Information  Forum in May.  Again,  the
computer scripts were executed successfully with no Y2K-related errors.

In addition  to our testing  schedule,  our Y2K team has  developed  contingency
plans.  These  plans  will  minimize  the  impact on our  investors  and help us
maintain operations in the event of any Y2K-related  incidents.  We will conduct
practice  drills of  contingency  scenarios  during  the rest of 1999 and refine
those  plans to respond  quickly and  effectively  so that the date change is as
seamless as possible  for  investors.  We expect the year 2000 to be business as
usual at American Century.

Year 2000 Readiness Disclosure

[left margin]

TAX-FREE MONEY MARKET
(BNTXX)
- ------------------------------------

Turn to the inside back cover of this  report to see a list of American  Century
funds classified by objective and risk.

AN IMPORTANT MESSAGE

    On March 1, we reorganized our funds under the American Century name. Though
the  venerable  Benham  name is  gone,  your  funds  will  maintain  their  same
disciplined investment management approach.

    James Benham's proven  fixed-income  investment  philosophy,  which provides
investors  a "pure  play" on a sector  of the bond  market,  will  remain.  That
investment practice--now a hallmark of investing at American Century--has helped
our fixed-income funds deliver solid performance over the years.

    In addition, we will continue to build our team of experienced  fixed-income
portfolio managers, which has doubled in size since American Century was formed.

    We look forward to continuing to meet your fixed-income  investment needs in
the tradition you have come to expect.


Our Message to You
- --------------------------------------------------------------------------------
/photo of James E. Stowers III and James E. Stowers, Jr./
James E. Stowers III, seated, with James E. Stowers, Jr.

     We experienced several investment mood swings in the U.S. financial markets
during the year ended May 31, 1999. When we last addressed you in the semiannual
report for American  Century  Tax-Free  Money  Market,  money market  yields had
plunged as investors  rushed to the relative  safety and liquidity of short-term
securities. Investors were spooked by global economic and financial turmoil. The
Federal Reserve (the U.S. central bank) cut short-term interest rates to bolster
a seemingly vulnerable U.S. economy and help stabilize markets worldwide.

     The Fed's actions  helped turn things  around.  By January  1999,  overseas
economies were  stabilizing,  the U.S.  economy was posting  strong growth,  and
investor  confidence had rebounded.  As a result,  investors  moved out of money
market  securities in favor of stocks and  higher-yielding  bonds.  Money market
yields returned to higher levels, though they remained  significantly lower than
they were a year earlier.

     Investors in American Century funds benefited from other noteworthy events.
In March, we consolidated all our funds under the American Century name.  Though
we are proud of the venerable Twentieth Century and Benham names, we believe the
change makes it simpler for you to identify your funds.

     We also reclassified all 71 of our funds based on investment goals and risk
levels,  so you can more  easily  choose  the funds  that are  right for you.  A
complete list of American Century funds,  arranged by their new classifications,
is on the inside back cover of this report.

     In  addition,  we enhanced  our Web site  (www.americancentury.com).  There
you'll find daily fund  information -- including  performance  and price data --
market and national news,  and a Forms Center with access to the  most-requested
investor  forms  and  applications.  You  can  also  sign  up  to  receive  fund
prospectuses and shareholder reports electronically.

     Finally, we continued to expand the American Century investment team, which
has  doubled  over the  last  three  years.  We're  committed  to  building  and
maintaining a talented management group.

     As always, we appreciate your continued confidence in American Century.

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        Vice Chairman of the Board and
                                         Chief Executive Officer

[right margin]

               Table of Contents
Frequently Asked
Questions ...................................................................  2
TAX-FREE MONEY MARKET
Performance Information .....................................................  3
Portfolio at a Glance .......................................................  3
Yields ......................................................................  3
Management Q&A ..............................................................  4
Portfolio Composition
by Credit Rating ............................................................  4
Portfolio Composition
by Security Type ............................................................  4
Schedule of Investments .....................................................  5
FINANCIAL STATEMENTS
Statement of Assets and
Liabilities .................................................................  9
Statement of Operations ..................................................... 10
Statements of Changes
in Net Assets ............................................................... 11
Notes to Financial
Statements .................................................................. 12
Financial Highlights ........................................................ 13
Report of Independent
Accountants ................................................................. 14
OTHER INFORMATION
Background Information
Investment Philosophy
and Policies ................................................................ 15
Lipper Rankings ............................................................. 15
Credit Rating
Guidelines .................................................................. 15
Investment and Credit
Research Teams .............................................................. 15
Glossary .................................................................... 16


                                                  www.americancentury.com      1


Money Market Funds--Frequently Asked Questions
- --------------------------------------------------------------------------------

Can I make direct deposits into my money market fund account?

     Yes. You can arrange for direct deposit of your paycheck,  Social  Security
check,  Treasury Direct interest payment,  military allotment,  or payments from
other  government  agencies.  Give us a call, and we will send you the necessary
information to set it up.

What is the holding period on new deposits into my account?

     Generally,  there is an  eight-business-day  holding  period for  deposited
funds  (initial  investments  in a new account  are held for 15 calendar  days).
There is a  one-business-day  holding  period for U.S.  Treasury  checks,  money
orders, and travelers' checks.

Is there a limit on the number of checks I can write on my money market account?

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

Is there an easy way to move  money  from my money  market  fund into a stock or
bond fund?

     Yes.  Moving money  between  funds is called an  exchange,  and there is no
limit  on the  number  of  exchanges  you can make  out of a money  market  fund
account.  However,  there is a limit of six  exchanges  per calendar year out of
stock and bond fund accounts.

     Exchanges can be made by:

*    visiting our Web site at www.americancentury.com*

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

*    calling an Investor Relations Representative at 1-800-345-2021*

*    writing us a letter

How do I decide  whether a taxable money market fund or a tax-free  money market
fund is right for me?

     The most important  factor to consider is your tax bracket.  Tax-free money
market funds  typically  offer lower yields than taxable  funds,  but you pay no
federal income taxes on the income from a tax-free fund.

     If you are in one of the higher federal income tax brackets, taxes will eat
up a big part of your income from a taxable  money  market  fund,  so a tax-free
investment may be better for you. If you're in a lower tax bracket, then you can
usually earn more in a taxable fund even after taxes are deducted.

     We can help you  figure it out.  If you give us a call and tell us what tax
bracket  you're in, we can tell you whether you're likely to earn more after-tax
income in a tax-free or a taxable money market fund.

If you have any  questions  about our money market  funds,  call us toll free at
1-800-345-2021 or e-mail us at our Web site, www.americancentury.com.

* Before an  investor  can make an  exchange  by calling an  Investor  Relations
  Representative,  using our  Automated  Information  Line,  or visiting our Web
  site, the investor first must have provided us with written  authorization  to
  do so.

[left margin]

A FASTER AND EASIER WAY TO DEPOSIT MUTUAL FUND DISTRIBUTIONS

If you prefer to have your fund dividend or capital gains  distributions sent to
you  instead of  reinvesting  them,  there are a couple of ways to get access to
this money faster than waiting for a check in the mail:

*  YOU CAN HAVE DISTRIBUTIONS DEPOSITED DIRECTLY INTO YOUR MONEY MARKET
   ACCOUNT. The money will be deposited the same day that the distributions
   are paid.

*  DISTRIBUTIONS CAN BE SENT ELECTRONICALLY TO YOUR BANK ACCOUNT. The money
   will be available in your bank account within three days.

Contact an Investor Relations Representative to set up either of these options.


2      1-800-345-2021


Tax-Free Money Market--Performance
- --------------------------------------------------------------------------------

TOTAL RETURNS AS OF MAY 31, 1999

                           TAX-FREE        TAX-EXEMPT MONEY MARKET FUNDS(2)
                         MONEY MARKET     AVERAGE RETURN     FUND'S RANKING
=============================================================================
6 MONTHS(1)                  1.40%            1.27%                --
1 YEAR                       3.10%            2.72%           5 OUT OF 127
=============================================================================
AVERAGE ANNUAL RETURNS
3 YEARS                      3.26%            2.93%           7 OUT OF 119
5 YEARS                      3.18%            3.00%           14 OUT OF 104
10 YEARS                     3.42%            3.34%           16 OUT OF 67

The fund's inception date was 7/31/84.

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

(2) According to Lipper Inc., an independent mutual fund ranking service.

See pages 15-16 for more  information  about  returns and Lipper fund  rankings.
Returns  and  rankings  would  have been lower if  management  fees had not been
waived.*

PORTFOLIO AT A GLANCE
                                    AS OF 5/31/99
NET ASSETS                         $283.0 MILLION
                                 5/31/99      5/31/98
NUMBER OF SECURITIES               71           103
WEIGHTED AVERAGE
  MATURITY                       49 DAYS      55 DAYS
EXPENSE RATIO                    0.31%*       0.04%*

YIELDS AS OF MAY 31, 1999
   7-DAY CURRENT YIELD           3.03%
   7-DAY EFFECTIVE YIELD         3.08%
   7-DAY TAX-EQUIVALENT YIELDS
      28.0% TAX BRACKET          4.21%
      31.0% TAX BRACKET          4.39%
      36.0% TAX BRACKET          4.73%
      39.6% TAX BRACKET          5.02%

Past performance does not guarantee future results.

Money market funds are neither  insured nor  guaranteed by the FDIC or any other
government agency.

Yields will fluctuate, and although the fund seeks to preserve the value of your
investment  at $1 per share,  it is possible to lose money by  investing  in the
fund. The 7-day yield more closely reflects  earnings of the fund than the total
return.

* American Century  Investment  Management,  Inc. (ACIM)  voluntarily waived its
  management fee from August 1, 1997, through July 31, 1998. Effective August 1,
  1998,  ACIM  began  decreasing  the  waiver  by 0.10% of fund net  assets on a
  monthly  basis until the waiver  expired in December  1998.  In absence of the
  waiver,  the fund's expense ratio would have been 0.50% for the year ended May
  31, 1999, and 0.52% for the year ended May 31, 1998.


                                                  www.americancentury.com      3


Tax-Free Money Market--Q&A
- --------------------------------------------------------------------------------
/photo of Bryan Karcher/

     An interview with Bryan Karcher,  a portfolio manager on the Tax-Free Money
Market fund investment team.

How did Tax-Free Money Market perform during the fiscal year ended May 31, 1999?

     The  fund's  fiscal-year  return  ranked  it  in  the  top  5% of  the  127
"Tax-Exempt  Money Market  Funds"  tracked by Lipper Inc. (See the previous page
for fund returns and performance  comparisons.) It's important to note, however,
that all or part of the fund's management fees were waived throughout 1998.

The fund's 7-day  current yield came down quite a bit in the past year (3.90% to
3.03%). Why?

     It's partly  because of the general drop in  short-term  interest  rates in
1998. In response to increasing  global market  volatility,  the Federal Reserve
lowered short-term rates three times between September and November.

     Supply  and  demand  factors in the  municipal  market  also had an impact.
Supply decreased  dramatically--budget  surpluses at many municipalities reduced
their borrowing needs.  Meanwhile,  demand for short-term  municipal  securities
surged. By February, tax-free money market yields were at their lowest levels in
nearly five years.

How did you position the fund in this environment?

     Although we extended the fund's average maturity  somewhat when the Fed was
cutting interest rates, we generally allowed the average maturity to drift lower
(as  low as 20  days  in  March).  For  much  of the  fiscal  year,  longer-term
securities  weren't  offering  any extra yield over  shorter-term  notes,  so we
didn't extend even though rates were declining.

     However,  we did lengthen the average  maturity  during tax season in April
and May, when investors  withdraw money from their money market  accounts to pay
income taxes. As funds sell securities to meet these redemptions,  we often find
one-year securities with attractive yields.

     This year was no  exception--we  bought  one-year  notes  yielding 25 basis
points more than shorter-term securities.  As a result, we lengthened the fund's
average maturity to about 50 days by the end of May.

What's your outlook for the municipal money market?

     Municipal money market yields have risen in recent weeks in anticipation of
an interest  rate  increase by the Fed. As expected,  the Fed raised  short-term
rates in late June,  expressing concern about the U.S. economy's  strength.  But
the Fed also suggested that it may not raise rates again for a while.

     We took advantage of rising yields to lengthen the fund's average  maturity
further in early June.  However, we think that yields will be more stable in the
coming  months,  so we  expect to  maintain  a neutral  average  maturity  going
forward.

[left margin]

PORTFOLIO COMPOSITION BY
CREDIT RATING
              % OF FUND INVESTMENTS
             AS OF             AS OF
            5/31/99          11/30/98
SP1+          75%               82%
SP1           18%               18%
SP2            7%               --

Ratings provided by Standard & Poor's.  See Credit Rating  Guidelines on page 15
for more information.

[pie charts - data below]

PORTFOLIO COMPOSITION BY
SECURITY TYPE

AS OF MAY 31, 1999
VRDNs               79%
Bonds less than
  1 Year            12%
Put Bonds            9%

AS OF NOVEMBER 30, 1998
VRDNs               82%
Bonds  less than
  1 Year             7%
Put Bonds            9%
Municipal Notes      2%

Security types are defined on page 16.


4      1-800-345-2021


Tax-Free Money Market--Schedule of Investments
- --------------------------------------------------------------------------------

MAY 31, 1999

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
SHORT-TERM MUNICIPAL SECURITIES--100.0%
ARIZONA--0.7%
            $  1,600,000   Pinal County Industrial
                              Development Auth. Pollution
                              Control Rev., Series 1984 A,
                              (Newmont), VRDN, 3.40%,
                              6/1/99 (LOC: National
                              Westminster Bank PLC)                $  1,600,000
                 400,000   Prescott Valley Water District Rev.,
                              3.50%, 1/1/00 (MBIA)                      400,664
                                                                   ------------
                                                                      2,000,664
                                                                   ------------
ARKANSAS--1.5%
               4,100,000   Pine Bluff Industrial Development
                              Rev., (Camden Wire Co., Inc.),
                              VRDN, 3.35%, 6/3/99 (LOC:
                              Chase Bank of Texas, N.A.)
                              (Acquired 7/31/97-9/2/98,
                              Cost $4,100,000)(1)                     4,100,000
                                                                   ------------
CALIFORNIA--3.4%
               5,500,000   California Higher Education Loan
                              Auth. Student Loan Rev.,
                              Series 1995 E-5, VRDN, 3.80%,
                              6/1/99 (LOC: Student Loan
                              Marketing Association)                  5,500,000
               4,000,000   Rialto Public Financing Auth. Tax
                              Allocation,   Series   1998  A,   (Agua   Mansa  &
                              Industrial), VRDN, 3.60%, 6/3/99 (LOC:
                              Union Bank of California N.A.)          4,000,000
                                                                   ------------
                                                                      9,500,000
                                                                   ------------
COLORADO--4.6%
               2,000,000   Arapahoe County Industrial
                              Development Rev., (Denver
                              Jetcenter), VRDN, 3.75%,
                              6/1/99 (LOC: U.S. Bank, N.A.)           2,000,000
               5,700,000   Colorado Health Facilities Auth.
                              Rev., Series 1986 A, (Porter
                              Memorial Hospital), 7.40%,
                              2/1/00, Prerefunded at 100%
                              of Par(2)                               5,856,515
               3,500,000   Denver Multifamily Housing Rev.,
                              Series 1989 A, (Cottonwood
                              Creek), VRDN, 3.50%, 6/1/99
                              (LOC: General Electric Capital
                              Corp.)                                  3,500,000
               1,555,000   SBC Metropolitan GO, 3.65%,
                              12/1/99 (LOC: U.S. Bank, N.A.)          1,555,000
                                                                   ------------
                                                                     12,911,515
                                                                   ------------
FLORIDA--21.3%
               1,000,000   Broward County Housing Finance
                              Auth. Multifamily Housing Rev.,
                              (Margate Investments), VRDN,
                              3.35%, 6/2/99 (LOC: Bank
                              One Texas, N.A.)                        1,000,000

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

            $  8,460,000   Broward County Housing Finance
                              Auth. Multifamily Housing Rev.,
                              Series 1990 A, (Palm
                              Aire-Oxford), VRDN, 3.40%,
                              6/2/99 (Guaranteed:
                              Continental Casualty Co.)            $  8,460,000
               4,010,000   Dade County Special Obligation
                              Trust Receipts, Series 1998 C-2,
                              VRDN, 3.45%, 6/2/99 (LOC:
                              Bank of America NT&SA)
                              (Acquired 1/5/99-5/28/99,
                              Cost $4,010,000)(1)                     4,010,000
               9,020,000   Florida Housing Finance Agency
                              Multifamily Rev., (Country Club),
                              VRDN, 3.80%, 6/1/99 (LOC:
                              Bank of New York)                       9,020,000
               8,000,000   Florida Housing Finance
                              Agency Multifamily Rev.,
                              (Woodlands), VRDN, 3.45%, 6/2/99 (LOC:
                              Northern Trust Company)                 8,000,000
               7,965,000   Florida Housing Finance Agency
                              Multifamily Rev., Series 1990 B,
                              (Beville-Oxford), VRDN, 3.40%,
                              6/2/99 (Guaranteed:
                              Continental Casualty Co.)               7,965,000
               1,000,000   Jacksonville Electric Auth. Rev.,
                              VRDN, 3.33%, 6/2/99
                              (SBBPA: Societe Generale)
                              (Acquired 4/24/98, Cost
                              $1,000,000)(1)                          1,000,000
                 700,000   Marion County Housing Finance
                              Auth. Multifamily Rev.,
                              Series 1985 D, (Summer Trace
                              Apartments), VRDN, 3.35%,
                              6/3/99 (LOC: Suntrust Bank,
                              Atlanta GA)                               700,000
               1,500,000   Miami-Dade County Educational
                              Facilities Auth. Rev., (Florida
                              Memorial College), VRDN,
                              3.30%, 6/3/99 (LOC:
                              NationsBank, N.A.) (Acquired
                              2/4/99, Cost $1,500,000)(1)             1,500,000
               5,000,000   Orange County Educational
                              Facilities Auth. Rev., (Rollins
                              College), VRDN, 3.30%,
                              6/2/99 (LOC: NationsBank,
                              N.A.)                                   5,000,000
               2,500,000   Orange County Health Facilities
                              Auth. Rev., (Presbyterian
                              Retirement), VRDN, 3.30%,
                              6/3/99 (LOC: NationsBank,
                              N.A.) (Acquired 2/4/99, Cost
                              $2,500,000)(1)                          2,500,000
               5,500,000   Palm Beach County Health
                              Facilities Auth. Rev., Series
                              1999 B, (Hospital Improvement),
                              VRDN, 3.35%, 6/2/99
                              (Guaranteed: Boca Raton
                              Community Hosp. & Foundation)           5,500,000

See Notes to Financial Statements


                                                  www.americancentury.com      5


Tax-Free Money Market--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

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

            $  4,690,000   Tallahassee-Leon County Civic
                              Center Auth. Capital
                              Improvement Rev., Series
                              1998 A, VRDN, 3.30%,
                              6/2/99 (LOC:Suntrust Bank,
                              Central Florida, N.A.)               $  4,690,000
                                                                   ------------
                                                                     59,345,000
                                                                   ------------
GEORGIA--6.9%
               7,750,000   Clayton County Hospital Auth.
                              Rev. Anticipation Certificates,
                              Series 1998 B, (Southern
                              Regional Medical Center),
                              VRDN, 3.30%, 6/2/99 (LOC:
                              Suntrust Bank, Atlanta GA)              7,750,000
               1,800,000   Cobb County Multifamily Housing
                              Rev., (Terrell Mill), VRDN, 3.45%,
                              6/2/99 (LOC: General Electric
                              Capital Corp.) (Acquired 5/1/96,
                              Cost $1,800,000)(1)                     1,800,000
               3,500,000   Fulton County Development Auth.
                              Rev., (Holy Innocents School),
                              VRDN, 3.30%, 6/2/99 (LOC:
                              Suntrust Bank, Atlanta GA)
                              (Acquired 2/9/98-2/25/98,
                              Cost $3,500,000)(1)                     3,500,000
               1,000,000   Municipal Electric Auth. Rev.,
                              Series 1997 B, (Project One),
                              5.00%, 1/1/00 (AMBAC)                   1,009,379
               5,300,000   Thomasville Hospital Auth. Rev.
                              Anticipation Certificates,
                              (J.D. Archbold), VRDN, 3.30%,
                              6/2/99 (LOC: Suntrust Bank,
                              Atlanta GA) (Acquired
                              12/11/97-5/28/99,
                              Cost $5,300,000)(1)                     5,300,000
                                                                   ------------
                                                                     19,359,379
                                                                   ------------
HAWAII--3.7%
              10,200,000   Hawaii Housing Finance and
                              Development Corp. Rev.,
                              Series 1993 A, (Affordable
                              Rental Housing), VRDN, 3.30%,
                              6/2/99 (LOC: Banque
                              Nationale de Paris S.A.)(3)            10,200,000
                                                                   ------------
ILLINOIS--3.5%
               1,625,000   Bartlett Multifamily Housing Rev.,
                              Series 1995 A, (Bartlett Square
                              Apartments), VRDN, 3.25%,
                              6/3/99 (LOC: LaSalle National
                              Bank)                                   1,625,000
               2,000,000   Chicago Park District GO, 5.50%,
                              1/1/00 (FGIC)                           2,023,290
               4,140,000   Illinois Sports Facilities Auth. Rev.,
                              Series 1999 A, 4.00%,
                              6/15/00 (MBIA)(4)                       4,166,579

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

            $  2,000,000   McCook Rev., Series 1996 B,
                              (St. Andrew Society), VRDN,
                              3.35%, 6/3/99 (LOC: Northern
                              Trust Company)                       $  2,000,000
                                                                   ------------
                                                                      9,814,869
                                                                   ------------
INDIANA--1.9%
               1,385,000   Center Grove High School
                              Building Corp., 4.00%, 7/5/99
                              (FSA)                                   1,385,914
                 855,000   Center Grove High School
                              Building Corp., 3.25%, 1/5/00
                              (FSA)                                     855,000
                 510,000   Eagle-Union Community School
                              Building Corp. Industrial Rev.,
                              3.15%, 7/5/99 (FSA)                       510,000
                 450,000   Eagle-Union Community School
                              Building Corp. Industrial Rev.,
                              3.25%, 1/5/00 (FSA)                       450,000
               1,000,000   Gary Industrial Development Rev.,
                              (Tinplate Partners International,
                              Inc.), VRDN, 3.50%, 6/3/99
                              (LOC: LaSalle National Bank)            1,000,000
               1,045,000   Lake County GO, 4.125%,
                              1/15/00 (FSA)                           1,050,866
                                                                   ------------
                                                                      5,251,780
                                                                   ------------
KANSAS--3.6%
              10,000,000   Burlington Pollution Control
                              Floating Rate Trust Receipts,
                              Series A7, 3.40%, 6/2/99
                              (MBIA) (SBBPA: Bank of
                              New York)                              10,000,000
                                                                   ------------
KENTUCKY--8.8%
              12,000,000   Kentucky Economic Development
                              Finance Auth. Rev., (Pooled
                              Hospital Loan Program), VRDN,
                              3.40%, 6/2/99 (Capital
                              Reinsurance Company)(SBBPA:
                              Chase Manhattan Bank)                  12,000,000
              10,000,000   Kentucky Turnpike Auth. Resource
                              Recovery Road Floating Rate
                              Trust Receipts, Series 1997-17,
                              3.40%, 6/2/99 (FSA)(SBBPA:
                              Commerzbank AG) (Acquired
                              10/8/97-12/12/97, Cost
                              $10,000,000)(1)                        10,000,000
               2,400,000   Mayfield Multi-City Lease Rev.,
                              VRDN, 3.40%, 6/2/99 (LOC:
                              PNC Bank NA)                            2,400,000
                                                                   ------------
                                                                     24,400,000
                                                                   ------------
LOUISIANA--0.9%
               1,500,000   Jefferson Parish Home Mortgage
                              Rev., Series 1998 C-2,
                              (Mortgage-Backed Securities),
                              3.625%, 9/1/99 (GIC:
                              Westdeutsche Landesbank
                              Girozentral)                            1,500,000

                                              See Notes to Financial Statements


6      1-800-345-2021


Tax-Free Money Market--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

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

            $  1,065,000   Orleans Parish School Board GO,
                              6.625%, 3/1/00 (AMBAC)               $  1,091,869
                                                                   ------------
                                                                      2,591,869
                                                                   ------------
MARYLAND--0.5%
               1,345,000   Prince Georges County COP,
                              Series 1998 A, (Equipment
                              Acquisition Program), 3.50%,
                              11/1/99 (MBIA)                          1,346,374
                                                                   ------------
MISSOURI--4.3%
               2,350,000   Fenton Industrial Development
                              Auth. Rev., (Clayton
                              Corp.), VRDN, 3.65%, 6/3/99
                              (LOC: Commerce Bank, N.A.
                              (Missouri))                             2,350,000
               2,090,000   Missouri Development Finance
                              Board Industrial Development
                              Rev., (J & J Enterprises), VRDN,
                              3.60%, 6/2/99 (LOC:
                              Commerce Bank, N.A.
                              (Missouri))                             2,090,000
               6,000,000   Missouri Health and Educational
                              Facilities Auth. Rev., (Pembroke
                              Hill School), VRDN, 3.35%,
                              6/3/99 (LOC: Commerce Bank,
                              N.A. (Missouri))                        6,000,000
               1,500,000   Phelps County Hospital Rev.,
                              (Phelps County Regional
                              Medical Center), 8.30%,
                              3/1/00, Prerefunded at 102%
                              of Par(2)                               1,584,712
                                                                   ------------
                                                                     12,024,712
                                                                   ------------
NEVADA--2.2%
               6,000,000   ABN Amro Munitops Certificates
                              Trust Receipts, Series 1998-1,
                              VRDN, 3.39%, 6/2/99 (MBIA)
                              (SBBPA: ABN Amro Bank N.V.)
                              (Acquired 6/3/98, Cost
                              $6,000,000)(1)                          6,000,000
                                                                   ------------
NEW YORK--1.3%
               3,700,000   New York GO, Series 1992 B,
                              VRDN, 3.30%, 6/1/99 (FGIC)
                              (SBBPA: General Electric
                              Capital Corp.)                          3,700,000
                                                                   ------------
NORTH DAKOTA--3.5%
               1,655,000   Hebron Industrial Development
                              Rev., (Dacco Inc.), VRDN,
                              3.50%, 6/3/99 (LOC: U.S.
                              Bank, N.A.) (Acquired 2/26/98,
                              Cost $1,655,000)(1)                     1,655,000
               8,000,000   North Dakota State Housing
                              Finance Agency Rev., Series
                              1999 C, (Housing Finance
                              Program), 3.20%, 4/1/00                 8,000,000
                                                                   ------------
                                                                      9,655,000
                                                                   ------------

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
OHIO--1.5%
            $  3,260,000   Butler County Healthcare Facilities
                              Rev., (Knolls of Oxford), VRDN,
                              3.30%, 6/3/99 (LOC: Firstar
                              Bank N.A.)                           $  3,260,000
               1,000,000   Toledo Waterworks Rev., 3.20%,
                              11/15/99 (FGIC)                         1,000,000
                                                                   ------------
                                                                      4,260,000
                                                                   ------------
OREGON--2.5%
               4,000,000   Oregon Health, Housing,
                              Educational and Cultural
                              Facilities Auth. Rev., (Quatama
                              Crossing), VRDN, 3.25%,
                              6/3/99 (LOC: U.S. Bank, N.A.)           4,000,000
               3,000,000   Oregon State Housing and
                              Community Services
                              Department Mortgage Rev.,
                              Series 1999 C, (Single Family
                              Mortgage), 3.15%, 4/13/00
                              (Acquired 4/5/99, Cost
                              $3,000,000)(1)                          3,000,000
                                                                   ------------
                                                                      7,000,000
                                                                   ------------
PENNSYLVANIA--1.4%
               3,000,000   Dauphin County General Auth.
                              Rev.,  Series 1997 A,
                              VRDN, 3.35%, 6/2/99 (FSA) (SBBPA:
                              Credit Suisse First Boston)             3,000,000
               1,000,000   Pennsylvania State Turnpike
                              Commission Rev., Series
                              1989 K, 7.50%, 12/1/99,
                              Prerefunded at 102% of Par(2)           1,040,448
                                                                   ------------
                                                                      4,040,448
                                                                   ------------
SOUTH DAKOTA--1.6%
               1,500,000   South Dakota Health &
                              Educational Facilities Auth. Rev.,
                              (Avera McKennan Issue), 4.00%,
                              7/1/99 (MBIA)                           1,500,356
               3,000,000   South Dakota Housing
                              Development Auth. Rev., Series
                              1998 C, (Homeownership
                              Mortgage), 3.75%, 8/5/99                3,000,000
                                                                   ------------
                                                                      4,500,356
                                                                   ------------
TENNESSEE--2.0%
               5,140,000   Maury County Health and
                              Educational Facilities Board Rev.,
                              Series 1990 E, (Southern
                              Healthcare), 10.50%, 3/1/00,
                              Prerefunded at 102% of Par(2)           5,513,187
                                                                   ------------
TEXAS--6.8%
               2,277,000   ABN Amro Munitops Certificates
                              Trust, Series 1998-22, VRDN,
                              3.20%, 6/2/99 (FSA) (SBBPA:
                              ABN Amro Bank N.V.) (Acquired
                              12/3/98, Cost $2,277,000)(1)            2,277,000

See Notes to Financial Statements


                                                  www.americancentury.com      7


Tax-Free Money Market--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

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

            $  5,500,000   Gulf Coast Industrial Development
                              Auth. Rev., (Petrounited Term
                              Inc.), VRDN, 3.32%, 6/3/99
                              (LOC: NationsBank, N.A.)             $  5,500,000
               4,495,000   Midland County Hospital District
                              Rev., VRDN, 3.32%, 6/3/99
                              (AMBAC)(Liquidity: Merrill
                              Lynch & Co., Inc.) (Acquired
                              11/20/97, Cost $4,495,000)(1)           4,495,000
               6,750,000   Tarrant County Health Facilities
                              Development Corporate Rev.,
                              (Carter Blood Care), VRDN,
                              3.40%, 6/3/99 (LOC: Chase
                              Bank of Texas, N.A.)                    6,750,000
                                                                   ------------
                                                                     19,022,000
                                                                   ------------
VIRGINIA--2.3%
               6,500,000   Halifax County Industrial
                              Development Auth. Rev.,
                              (O'Sullivan Industries), VRDN,
                              3.60%, 6/3/99 (LOC:
                              NationsBank, N.A.) (Acquired
                              2/1/99, Cost $6,500,000)(1)             6,500,000
                                                                   ------------

Principal Amount                                                       Value
- --------------------------------------------------------------------------------
WASHINGTON--3.7%
            $  1,710,000   Pierce County Economic
                              Development Corporate Rev.,
                              (K & M Holdings II), VRDN,
                              3.45%, 6/2/99 (LOC: Wells
                              Fargo Bank, N.A.) (Acquired
                              11/17/97, Cost $1,710,000)(1)        $  1,710,000
               2,010,000   Washington Health Care Facilities
                              Auth. Rev., (Multicare Health
                              System), 4.00%, 8/15/99
                              (MBIA)                                  2,011,230
               6,600,000   Washington State Housing
                              Finance Commission Multifamily
                              Mortgage Rev., (Mill Plain
                              Crossing), VRDN, 3.35%,
                              6/1/99 (LOC: Harris Trust &
                              Savings Bank)                           6,600,000
                                                                   ------------
                                                                     10,321,230
                                                                   ------------
WISCONSIN--5.6%
              15,500,000   Ladysmith Solid Waste Disposal
                              Facility Rev., (City Forest Corp.),
                              VRDN, 3.80%, 6/2/99 (LOC:
                              Union Bank of California N.A.)         15,500,000
                                                                   ------------
TOTAL INVESTMENT SECURITIES--100.0%                                $278,858,383
                                                                   ============

NOTES TO SCHEDULE OF INVESTMENTS

AMBAC = AMBAC Assurance Corporation

COP = Certificates of Participation

FGIC = Financial Guaranty Insurance Co.

FSA = Financial Security Assurance Inc.

GIC = Guaranteed Investment Contract

GO = General Obligation

LOC = Letter of Credit

MBIA = MBIA Insurance Corp.

SBBPA = Standby Bond Purchase Agreement

VRDN = Variable Rate Demand Note.  Interest  reset date is indicated and used in
calculating the weighted average portfolio maturity. Rate shown is effective May
31, 1999.

(1)  Security was purchased  under Rule 144A of the Securities Act of 1933 or is
     a private  placement and, unless  registered under the Act or exempted from
     registration,  may only be sold to qualified institutional  investors.  The
     aggregate value of these securities at May 31, 1999, was $59,347,000, which
     represented 21.0% of net assets. None of these securities are considered to
     be illiquid.

(2)  Escrowed  to  maturity in U.S.  government  securities,  or state and local
     government securities.

(3)  Security,  or a portion thereof,  has been segregated at the custodian bank
     for a when-issued security.

(4) When-issued security.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* the principal amount of each investment

* the amortized cost of each investment

* the percentage of investments in each state

                                              See Notes to Financial Statements


8      1-800-345-2021


Statement of Assets and Liabilities
- --------------------------------------------------------------------------------

MAY 31, 1999

ASSETS
Investment securities, at value
(amortized cost and cost for
federal income tax purposes) ...............................        $278,858,383
Cash .......................................................           1,485,151
Receivable for investments sold ............................           5,400,000
Interest receivable ........................................           1,662,481
                                                                    ------------
                                                                     287,406,015
                                                                    ------------

LIABILITIES
Payable for investments purchased ..........................           4,170,719
Dividends payable ..........................................              66,182
Accrued management fees (Note 2) ...........................             122,202
Payable for trustees' fees and expenses ....................               1,067
                                                                    ------------
                                                                       4,360,170
                                                                    ------------
Net Assets .................................................        $283,045,845
                                                                    ============

CAPITAL SHARES
Outstanding (unlimited number
of shares authorized) ......................................         283,003,220
                                                                    ============
Net Asset Value Per Share ..................................        $       1.00
                                                                    ============

NET ASSETS CONSIST OF:
Capital paid in ............................................        $283,003,220
Undistributed net investment income ........................              19,650
Accumulated undistributed net
realized gain on investments ...............................              22,975
                                                                    ------------
                                                                    $283,045,845
                                                                    ============

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF ASSETS AND  LIABILITIES--This  statement details
what the fund owns (assets),  what it owes (liabilities),  and its net assets as
of the last day of the period.  If you subtract  what the fund owes from what it
owns, you get the fund's net assets.  The net assets divided by the total number
of shares  outstanding  gives you the price of an individual  share,  or the net
asset value per share.

NET ASSETS are also broken down by capital (money invested by shareholders); net
investment income not yet paid to shareholders (if any); and net gains earned on
investment activity but not yet paid to shareholders or net losses on investment
activity (known as realized gains or losses). This breakdown tells you the value
of net assets that are performance-related,  such as investment gains or losses,
and the  value  of net  assets  that are not  related  to  performance,  such as
shareholder investments and redemptions.

See Notes to Financial Statements


                                                  www.americancentury.com      9


Statement of Operations
- --------------------------------------------------------------------------------

YEAR ENDED MAY 31, 1999

INVESTMENT INCOME
Income:
Interest .................................................         $ 13,729,550
                                                                   ------------
Expenses (Note 2):
Management fees ..........................................            1,990,313
Trustees' fees and expenses ..............................               15,621
                                                                   ------------
Total expenses ...........................................            2,005,934
Amount waived ............................................             (772,955)
                                                                   ------------
Net expenses .............................................            1,232,979
                                                                   ------------
Net investment income ....................................           12,496,571
                                                                   ------------

NET REALIZED GAIN
ON INVESTMENTS
Net realized gain on investments .........................               22,974
                                                                   ------------
Net Increase in Net Assets
Resulting from Operations ................................         $ 12,519,545
                                                                   ============

- --------------------------------------------------------------------------------
UNDERSTANDING  THE STATEMENT OF  OPERATIONS--This  statement breaks down how the
fund's  net  assets  changed  during  the  period  as a  result  of  the  fund's
operations.  It tells you how much money the fund made or lost after taking into
account income,  fees and expenses,  and investment gains or losses. It does not
include shareholder transactions and distributions.

Fund OPERATIONS include:

* interest income earned from investments

* management fees and other expenses

* gains or losses from selling investments (known as realized gains or losses)

                                              See Notes to Financial Statements


10      1-800-345-2021


Statements of Changes in Net Assets
- --------------------------------------------------------------------------------

YEARS ENDED MAY 31, 1999 AND MAY 31, 1998

Increase (Decrease) in Net Assets                     1999             1998

OPERATIONS
Net investment income ........................   $  12,496,571    $   8,931,358
Net realized gain on investments .............          22,974           19,651
                                                 -------------    -------------
Net increase in net assets
resulting from operations ....................      12,519,545        8,951,009
                                                 -------------    -------------

DISTRIBUTIONS TO SHAREHOLDERS
From net investment income ...................     (12,496,571)      (8,931,358)
                                                 -------------    -------------

CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold ....................     564,457,327      786,813,923
Proceeds from reinvestment
of distributions .............................      11,355,619        8,415,885
Payments for shares redeemed .................    (737,066,946)    (436,702,980)
                                                 -------------    -------------
Net increase (decrease) in net assets
from capital share transactions ..............    (161,254,000)     358,526,828
                                                 -------------    -------------
Net increase (decrease) in net assets ........    (161,231,026)     358,546,479

NET ASSETS
Beginning of period ..........................     444,276,871       85,730,392
                                                 -------------    -------------
End of period ................................   $ 283,045,845    $ 444,276,871
                                                 =============    =============
Undistributed net investment income ..........   $      19,650             --
                                                 =============    =============

TRANSACTIONS IN SHARES OF THE FUND
Sold .........................................     564,457,327      786,813,923
Issued in reinvestment of distributions ......      11,355,619        8,415,885
Redeemed .....................................    (737,066,946)    (436,702,980)
                                                 -------------    -------------
Net increase (decrease) ......................    (161,254,000)     358,526,828
                                                 =============    =============

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF CHANGES IN NET ASSETS--These statements show how
the fund's net assets  changed over the past two reporting  periods.  It details
how much a fund grew or shrank as a result of:

* operations--a summary of the Statement of Operations from the previous page
  for the most recent period

* distributions--income and gains distributed to shareholders

* capital share transactions--shareholders' purchases, reinvestments, and
  redemptions

Net  assets  at the  beginning  of  the  period  plus  the  sum  of  operations,
distributions  to  shareholders  and capital  share  transactions  result in net
assets at the end of the period.

See Notes to Financial Statements


                                                 www.americancentury.com      11


Notes to Financial Statements
- --------------------------------------------------------------------------------

MAY 31, 1999

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    ORGANIZATION -- American Century  Municipal Trust (the trust), is registered
under the Investment  Company Act of 1940 as an open-end  management  investment
company.  Tax-Free Money Market Fund (the fund) is one of the eight funds issued
by the trust.  The fund is  diversified  under the 1940 Act. Its objective is to
seek as high a level of current  income  exempt from federal  income taxes as is
consistent with prudent investment  management and conservation of shareholders'
capital by investing primarily in short-term municipal obligations. The fund may
concentrate  its  investments  in  certain  states and  therefore  may have more
exposure to credit  risk  related to those  states than funds that have  broader
geographical diversification.  The following significant accounting policies are
in accordance with generally accepted  accounting  principles;  these principles
may require the use of estimates by fund management.

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

    SECURITY  TRANSACTIONS -- Security  transactions are accounted for as of the
trade date. 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.

    INCOME  TAX  STATUS  -- It is  the  fund's  policy  to  distribute  all  net
investment  income  and net  realized  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  and  credited  daily and  distributed  monthly.  The fund does not
expect to realize any long-term  capital gains and accordingly,  does not expect
to pay any capital gain  distributions.  For the year ended May 31,  1999,  100%
(unaudited) of the funds'  distributions  from net  investment  income have been
designated as exempt from federal income tax.

    ADDITIONAL  INFORMATION  -- Funds  Distributor,  Inc.  (FDI) is the  trust's
distributor. Certain officers of FDI are also officers of the trust.

- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

    The trust has entered  into a Management  Agreement  with  American  Century
Investment  Management,  Inc.  (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,
taxes,  portfolio insurance,  interest,  fees and expenses of those Trustees 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 calculated daily and paid monthly. It consists of an Investment
Category  Fee based on the average net assets of the funds in a specific  fund's
investment category and a Complex Fee based on the average net assets of all the
funds  managed by ACIM.  The rates for the  Investment  Category  Fee range from
0.1570%  to 0.2700%  and the rates for the  Complex  Fee range  from  0.2900% to
0.3100%.  For the year ended May 31, 1999, the effective  annual  management fee
excluding the waiver was 0.50%.

    ACIM waived all expenses  through July 31, 1998.  Effective  August 1, 1998,
ACIM began  decreasing the waiver by 0.10% of the fund's net assets on a monthly
basis. The gradual expiration of the waiver continued until December 1998.

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

- --------------------------------------------------------------------------------
3. FUND EVENTS

   The following name change became effective March 1, 1999:

           =====================================================================
           NEW NAME                      FORMER NAME
           =====================================================================

   FUND:   Tax-Free Money Market Fund    American Century - Benham Tax-Free
                                         Money Market Fund


12   1-800-345-2021


Tax-Free Money Market--Financial Highlights
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                    For a Share Outstanding Throughout the Years Ended May 31

                                        1999              1998              1997          1996          1995
PER-SHARE DATA
Net Asset Value,
<S>                                <C>               <C>               <C>           <C>           <C>
Beginning of Period .............  $      1.00       $      1.00       $      1.00   $      1.00   $      1.00
                                   -----------       -----------       -----------   -----------   -----------
Income From Investment Operations
Net Investment Income ...........         0.03              0.04              0.03          0.03          0.03
                                   -----------       -----------       -----------   -----------   -----------
Distributions
From Net Investment Income ......        (0.03)            (0.04)            (0.03)        (0.03)        (0.03)
                                   -----------       -----------       -----------   -----------   -----------
Net Asset Value, End of Period ..  $      1.00       $      1.00       $      1.00   $      1.00   $      1.00
                                   ===========       ===========       ===========   ===========   ===========
Total Return(1) .................         3.10%             3.70%             2.98%         3.19%         2.95%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ...........         0.31%(2)          0.04%(2)          0.67%         0.65%         0.66%
Ratio of Net Investment Income
to Average Net Assets ...........         3.10%(2)          3.68%(2)          2.93%         3.12%         2.88%
Net Assets, End of Period
(in thousands) ..................  $   283,046       $   444,277       $    85,730   $    91,118   $    92,034
</TABLE>

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

(2) ACIM voluntarily  waived its management fee from August 1, 1997 through July
    31, 1998.  Effective  August 1, 1998,  ACIM began  decreasing  the waiver by
    0.10% of the fund's net assets on a monthly basis,  until the waiver expired
    in December 1998. In absence of the waiver,  the ratio of operating expenses
    to average net assets and the ratio of net investment  income to average net
    assets  would  have been  0.50% and 2.91% for 1999,  and 0.52% and 3.20% for
    1998, respectively.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL  HIGHLIGHTS--This  statement itemizes current period
activity and  statistics and provides  comparison  data for the last five fiscal
years.

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income

* income distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

See Notes to Financial Statements


                                                 www.americancentury.com      13


Report of Independent Accountants
- --------------------------------------------------------------------------------

To  the  Board  of  Trustees  of  the  American  Century   Municipal  Trust  and
Shareholders of the Tax Free Money Market Fund:

In our opinion, the accompanying statement of assets and liabilities,  including
the schedule of  investments,  and the related  statements of operations  and of
changes  in net assets  and the  financial  highlights  present  fairly,  in all
material  respects,  the  financial  position of the Tax Free Money  Market Fund
(formerly the American  Century - Benham Tax Free Money Market Fund) (one of the
eight funds in the American Century  Municipal Trust,  hereafter  referred to as
the "Fund") at May 31, 1999, and the results of its operations for the year then
ended,  the changes in its net assets and the financial  highlights  for each of
the two years in the period then ended,  in conformity  with generally  accepted
accounting  principles.  These  financial  statements  and financial  highlights
(hereafter referred to as "financial  statements") are the responsibility of the
Fund's  management;  our  responsibility  is to  express  an  opinion  on  these
financial  statements based on our audits. The financial  highlights for each of
the  three  years in the  period  ended  May 31,  1997,  were  audited  by other
auditors,  whose report, dated July 7, 1997, expressed an unqualified opinion on
those  statements.  We conducted  our audits of these  financial  statements  in
accordance with generally  accepted  auditing  standards,  which require that we
plan and  perform the audit to obtain  reasonable  assurance  about  whether the
financial  statements  are free of  material  misstatement.  An  audit  includes
examining,  on a test basis,  evidence supporting the amounts and disclosures in
the  financial   statements,   assessing  the  accounting  principles  used  and
significant  estimates made by management,  and evaluating the overall financial
statement presentation.  We believe that our audits, which included confirmation
of securities at May 31, 1999 by correspondence  with the custodian and brokers,
provide a reasonable basis for the opinion expressed above.


                                                      PricewaterhouseCoopers LLP


Kansas City, Missouri
July 12, 1999


14      1-800-345-2021


Background Information
- --------------------------------------------------------------------------------

INVESTMENT PHILOSOPHY AND POLICIES

     American  Century offers 38 fixed-income  funds,  ranging from money market
portfolios  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  benchmark  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

     TAX-FREE MONEY MARKET is a money market fund that seeks to provide interest
income  exempt from federal  income taxes by investing in  short-term  municipal
securities.

     Investments in Tax-Free Money Market are neither  insured nor guaranteed by
the FDIC or any other government agency. Yields will fluctuate, and although the
fund seeks to  preserve  the value of your  investment  at $1 per  share,  it is
possible to lose money by investing in the fund.

     Investment  income may be subject to  certain  state and local  taxes,  and
depending on your tax status, may be subject to the federal  alternative minimum
tax. Capital gains are not exempt from federal income tax.

LIPPER RANKINGS

     LIPPER 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 funds in Lipper's  TAX-EXEMPT  MONEY  MARKET FUNDS  category  intend to
maintain  a  constant  net asset  value and  invest  in  high-quality  municipal
obligations with dollar-weighted average maturities of less than 90 days.

CREDIT RATING GUIDELINES

     Credit  quality (the  issuer's  financial  strength and the  likelihood  of
timely  payment of  interest  and  principal)  is a key  factor in  fixed-income
investment  analysis.  Credit ratings issued by independent  rating and research
companies such as Standard & Poor's help quantify credit  quality--the  stronger
the issuer,  the higher the credit rating.  In turn,  credit quality and ratings
greatly influence the prices and yields of fixed-income securities--high ratings
mean higher prices and less current income (yield) as compensation for risk.

     But credit ratings are subjective.  They reflect the opinions of the rating
agencies that issue them and are not absolute standards of quality. Furthermore,
high credit ratings do not guarantee good  investment  performance.  They do not
reflect the price  stability  of a municipal  security  when  economic or market
conditions change.

[right margin]

INVESTMENT TEAM LEADERS
   PORTFOLIO MANAGER
     BRYAN KARCHER

MUNICIPAL CREDIT RESEARCH TEAM
   MANAGER
     STEVEN PERMUT
   MUNICIPAL CREDIT ANALYSTS
     DAVID MOORE
     ROBERT MILLER
     BILL MCCLINTOCK
     TIM BENHAM
     BRAD BODE


                                                 www.americancentury.com      15


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 13.

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.

*  TAX-EQUIVALENT  YIELDS show the taxable  yields that  investors  in a federal
income tax bracket would have to earn before taxes to equal the fund's  tax-free
yield.

INVESTMENT TERMS

* BASIS POINT -- a basis point equals one  one-hundredth  of a percentage  point
(or 0.01%). Therefore, 100 basis points equals one percentage point (or 1%).

PORTFOLIO STATISTICS

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

* WEIGHTED  AVERAGE  MATURITY  (WAM) -- a measurement  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.

* 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 MUNICIPAL SECURITIES

* MUNICIPAL COMMERCIAL PAPER (CP) -- high-grade  short-term securities backed by
a line of credit from a bank.

* MUNICIPAL NOTES -- securities with maturities of two years or less.

* PUT BONDS -- long-term  securities that can be "put back" (i.e.,  sold at face
value) to a specified buyer at a prearranged date.

*  VARIABLE-RATE  DEMAND NOTES (VRDNS) -- securities  that track market interest
rates and  stabilize  their  market  values  using  periodic  (daily or  weekly)
interest rate adjustments.


16      1-800-345-2021


Glossary
- --------------------------------------------------------------------------------
                                                                    (Continued)
FUND CLASSIFICATIONS

INVESTMENT OBJECTIVE

     The investment  objective may be based on the fund's objective as stated in
its  prospectus or fund profile,  or the fund's  categorization  by  independent
rating organizations based on its management style.

* CAPITAL  PRESERVATION  -- Offers  taxable and tax-free  money market funds for
relative stability of principal and liquidity.

* INCOME -- Offers funds that can provide current income and competitive yields,
as well as a strong and stable  foundation and generally lower volatility levels
than stock funds.

* GROWTH & INCOME --  Offers  funds  that  emphasize  both  growth  and  income,
provided  by either  dividend-paying  equities  or a  combination  of equity and
fixed-income securities.

* GROWTH -- Offers  funds with a focus on  capital  appreciation  and  long-term
growth,  generally providing high return potential with corresponding high price
fluctuation risk.

RISK

     The  classification  of funds  by risk  category  is based on  quantitative
historical  measures  as well as  qualitative  prospective  measures.  It is not
intended to be a precise  indicator of future risk or return levels.  The degree
of risk within each category can vary significantly,  and some fund returns have
historically  been  higher  than  more  aggressive  funds  or  lower  than  more
conservative  funds.  Please be aware that the fund's  category  may change over
time.  Therefore,  it is  important  that you read a fund's  prospectus  or fund
profile carefully before investing to ensure its objectives,  policies, and risk
potential are consistent with your needs.

*  CONSERVATIVE  -- these funds  generally  provide lower return  potential with
either low or minimal price fluctuation risk.

* MODERATE -- these funds  generally  provide  moderate  return  potential  with
moderate price fluctuation risk.

*  AGGRESSIVE  -- these  funds  generally  provide  high return  potential  with
corresponding high price fluctuation risk.


                                                 www.americancentury.com      17


Notes
- --------------------------------------------------------------------------------


18      1-800-345-2021


Notes
- --------------------------------------------------------------------------------


                                                 www.americancentury.com      19


Notes
- --------------------------------------------------------------------------------


20      1-800-345-2021


[inside back cover]

===============================================================================
INVESTMENT OBJECTIVE - CAPITAL PRESERVATION
===============================================================================

                  RISK LEVEL - CONSERVATIVE

TAXABLE MONEY MARKETS           TAX-FREE MONEY MARKETS

Premium  Capital Reserve        FL Municipal Money Market
Prime Money Market              CA Municipal Money Market
Premium Government Reserve      CA Tax-Free Money Market
Government Agency               Tax-Free Money Market
   Money Market
Capital Preservation

===============================================================================
INVESTMENT OBJECTIVE - INCOME
===============================================================================

                   RISK LEVEL - AGGRESSIVE

TAXABLE BONDS                   TAX-FREE BONDS

Target 2025*                    CA High-Yield Municipal
Target 2020*                    High-Yield Municipal
Target 2015*
Target 2010*
High-Yield
International Bond

                    RISK LEVEL - MODERATE

TAXABLE BONDS                   TAX-FREE BONDS

Long-Term Treasury              CA Long-Term Tax-Free
Target 2005*                    Long-Term Tax-Free
Bond                            CA Insured Tax-Free
Premium Bond

                   RISK LEVEL - CONSERVATIVE

TAXABLE BONDS                   TAX-FREE BONDS

Intermediate-Term Bond          CA Intermediate-Term Tax-Free
Intermediate-Term Treasury      AZ Intermediate-Term Municipal
GNMA                            FL Intermediate-Term Municipal
Inflation-Adjusted Treasury     Intermediate-Term  Tax-Free
Limited-Term Bond               CA Limited-Term  Tax-Free
Target 2000*                    Limited-Term Tax-Free
Short-Term Government
Short-Term Treasury

===============================================================================
INVESTMENT OBJECTIVE - GROWTH AND INCOME
===============================================================================

                     RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY

Small Cap Quantitative
Small Cap Value

                      RISK LEVEL - MODERATE

ASSET ALLOCATION/BALANCED       DOMESTIC EQUITY        SPECIALTY

Strategic Allocation --         Equity Growth          Utilities
   Aggressive                   Equity Index           Real Estate
Balanced                        Tax-Managed Value
Strategic Allocation --         Income & Growth
   Moderate                     Value
Strategic Allocation --         Equity Income
   Conservative

===============================================================================
INVESTMENT OBJECTIVE - GROWTH
===============================================================================

                      RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY                 SPECIALTY              INTERNATIONAL

New Opportunities               Global Gold            Emerging Markets
Giftrust(reg.tm)                                       International Discovery
Vista                                                  International Growth
Heritage                                               Global Growth
Growth
Ultra(reg.tm)
Select

                       RISK LEVEL - MODERATE

SPECIALTY

Global Natural Resources


The investment  objective may be based on the fund's  objective as stated in its
prospectus or fund profile,  or the fund's  categorization by independent rating
organizations based on its management style.

The classification of funds by risk category is based on quantitative historical
measures as well as qualitative prospective measures. It is not intended to be a
precise  indicator  of future risk or return  levels.  The degree of risk within
each category can vary  significantly,  and some fund returns have  historically
been higher than more aggressive  funds or lower than more  conservative  funds.
Please be aware that a fund's  category may change over time.  Therefore,  it is
important  that you read a fund's  prospectus or fund profile  carefully  before
investing to ensure its  objectives,  policies and risk potential are consistent
with your needs.

For a definition of fund categories, see the Glossary.

*  While listed within the Income investment objective,  the Target funds do not
   pay current dividend income.  Income dividends are distributed once a year in
   December. The Target funds are listed in all three risk categories due to the
   dramatic  price  volatility  investors may  experience  during certain market
   conditions.  If held  to  their  target  dates,  however,  they  can  offer a
   conservative, dependable way to invest for a specific time horizon.

Please call  1-800-345-2021  for a prospectus or profile on any American Century
fund.  These  documents  contain  important  information  including  charges and
expenses, and you should read them carefully before you invest or send money.


[back cover]

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

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

WWW.AMERICANCENTURY.COM

INVESTOR RELATIONS
1-800-345-2021 OR 816-531-5575

AUTOMATED INFORMATION LINE
1-800-345-8765

FAX: 816-340-7962

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

BUSINESS, NOT-FOR-PROFIT, EMPLOYER-SPONSORED RETIREMENT PLANS
1-800-345-3533

AMERICAN CENTURY MUNICIPAL TRUST

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.

- --------------------------------------------------------------------------------
American Century Investments                                      BULK RATE
P.O. Box 419200                                               U.S. POSTAGE PAID
Kansas City, MO 64141-6200                                    AMERICAN CENTURY
www.americancentury.com                                           COMPANIES

9907                                                    Funds Distributor, Inc.
SH-ANN-17026                      (c)1999 American Century Services Corporation
<PAGE>
[front cover]
                                                                    MAY 31, 1999

ANNUAL REPORT
- -----------------
AMERICAN CENTURY

    [graphic of stairs]

- --------------------------
LIMITED-TERM TAX-FREE
INTERMEDIATE-TERM TAX-FREE
LONG-TERM TAX FREE
HIGH-YIELD MUNICIPAL

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

[inside front cover]


Y2K TESTING EFFORTS PAY  DIVIDENDS IN PREPAREDNESS
- --------------------------------------------------------------------------------

Y2K, short for the year 2000,  refers more  specifically to the date change from
December  31,  1999 to January  1, 2000.  This date  change is  significant  for
computers  because  many  were  originally  programmed  to  process  dates  with
two-character years -- 99 instead of 1999.

When the  calendar  rolls  to  2000,  this can  create  problems  for  computers
programmed  this way because they will read the date as "00," and may  interpret
it as 1900. Most companies have been working to reprogram their computer systems
with  four-digit  years.  Reprogramming  is very  labor-intensive  and  requires
testing  to ensure  that  there  are no  errors  and that all lines of code were
successfully changed.

Recognizing  the possible  impact of the Y2K issue,  our  senior-level  Steering
Committee,  programmers,  business  partners  and Y2K  team  have  been  working
diligently to make January 1, 2000 a non-event for American Century investors.

Currently,  all of our computer systems have been modified,  tested and returned
to  production.  We have an ongoing  commitment  to testing our systems with our
vendors and business partners and within the industry throughout the rest of the
year.

In March  and April of this  year,  we  participated  in the  Security  Industry
Association's (SIA) industry-wide test and successfully  processed  transactions
for dates up to and beyond 2000. American Century  transactions with our partner
firms were processed free of Y2K bugs. We also  participated  in the Market Data
Test conducted by the SIA and Financial  Information  Forum in May.  Again,  the
computer scripts were executed successfully with no Y2K-related errors.

In addition  to our testing  schedule,  our Y2K team has  developed  contingency
plans.  These  plans  will  minimize  the  impact on our  investors  and help us
maintain operations in the event of any Y2K-related  incidents.  We will conduct
practice  drills of  contingency  scenarios  during  the rest of 1999 and refine
those  plans to respond  quickly and  effectively  so that the date change is as
seamless as possible  for  investors.  We expect the year 2000 to be business as
usual at American Century.

Year 2000 Readiness Disclosure

[left margin]

LIMITED-TERM TAX-FREE
(TWTSX)
- ------------------------------------
INTERMEDIATE-TERM TAX-FREE
(TWTIX)
- ------------------------------------
LONG-TERM TAX-FREE
(TWTLX)
- ------------------------------------

HIGH-YIELD MUNICIPAL
(ABHYX)
- ------------------------------------

Turn to the inside back cover of this  report to see a list of American  Century
funds classified by objective and risk.

AN IMPORTANT MESSAGE

    On March 1, we reorganized our funds under the American Century name. Though
the  venerable  Benham  name is  gone,  your  funds  will  maintain  their  same
disciplined investment management approach.

    James Benham's proven  fixed-income  investment  philosophy,  which provides
investors  a "pure  play" on a sector  of the bond  market,  will  remain.  That
investment practice--now a hallmark of investing at American Century--has helped
our fixed-income funds deliver solid performance over the years.

    In addition, we will continue to build our team of experienced  fixed-income
portfolio managers, which has doubled in size since American Century was formed.

    We look forward to continuing to meet your fixed-income  investment needs in
the tradition you have come to expect.


Our Message to You
- --------------------------------------------------------------------------------
/photo of James E. Stowers III and James E. Stowers, Jr./
James E. Stowers III, seated, with James E. Stowers, Jr.

     We experienced several investment mood swings in the U.S. financial markets
during the year ended May 31, 1999. When we last addressed you in the semiannual
report for  American  Century  High-Yield  Municipal  and the  American  Century
Limited-,  Intermediate-, and Long-Term Tax-Free funds, yields had fallen as the
U.S.  bond market  rallied.  The bond gains were spurred by global  economic and
financial  turmoil,  which motivated the Federal Reserve (the U.S. central bank)
to cut short-term interest rates to bolster a seemingly  vulnerable U.S. economy
and help stabilize markets worldwide.

     The Fed's actions  helped turn things  around.  By January  1999,  overseas
economies were  stabilizing,  the U.S.  economy was posting  strong growth,  and
investor  confidence  had rebounded.  As a result,  stocks rallied and U.S. bond
yields generally returned to higher levels, though they remained lower than they
were a year earlier.  Municipal bonds,  which  underperformed  Treasury bonds in
1998, outperformed Treasurys during the first five months of 1999.

     Investors in American  Century  tax-free and municipal funds benefited from
other positive  developments  as 1999 unfolded.  We continued to focus on making
our  services  as easy to use as  possible  and  helping  investors  reach their
financial  goals.  In March,  we  consolidated  all our funds under the American
Century name. Though we are proud of the venerable  Twentieth Century and Benham
names, we believe the change makes it simpler for you to identify your funds.

     We also reclassified all 71 of our funds based on investment goals and risk
levels,  so you can more  easily  choose  the funds  that are  right for you.  A
complete list of American Century funds,  arranged by their new classifications,
is on the inside back cover of this report.

     In  addition,  we enhanced  our Web site  (www.americancentury.com).  There
you'll find daily fund  information -- including  performance  and price data --
market and national news,  and a Forms Center with access to the  most-requested
investor  forms  and  applications.  You  can  also  sign  up  to  receive  fund
prospectuses and shareholder reports electronically.

     Finally, we continued to expand the American Century investment team, which
has  doubled  over the  last  three  years.  We're  committed  to  building  and
maintaining a talented management group.

     As always, we appreciate your continued confidence in American Century.

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        Vice Chairman of the Board and
                                         Chief Executive Officer

[right margin]
               Table of Contents
Report Highlights ..........................................................   2
Market Perspective .........................................................   4
Municipal Credit Review ....................................................   5
LIMITED-TERM TAX-FREE
Performance Information ....................................................   6
Management Q&A .............................................................   7
Schedule of Investments ....................................................   9
INTERMEDIATE-TERM TAX-FREE
Performance Information ....................................................  12
Management Q&A .............................................................  13
Schedule of Investments ....................................................  15
LONG-TERM TAX-FREE
Performance Information ....................................................  20
Management Q&A .............................................................  21
Schedule of Investments ....................................................  23
HIGH-YIELD MUNICIPAL
Performance Information ....................................................  27
Management Q&A .............................................................  28
Schedule of Investments ....................................................  30
FINANCIAL STATEMENTS
Statements of Assets and
Liabilities ................................................................  33
Statements of Operations ...................................................  34
Statements of Changes
in Net Assets ..............................................................  35
Notes to Financial
Statements .................................................................  37
Financial Highlights .......................................................  40
Report of Independent
Accountants ................................................................  44
OTHER INFORMATION
Background Information
Investment Philosophy
and Policies ...............................................................  45
Comparative Indices ........................................................  45
Lipper Rankings ............................................................  45
Investment and Credit
Research Teams .............................................................  45
Glossary ...................................................................  46


                                                  www.americancentury.com      1


Report Highlights
- --------------------------------------------------------------------------------

MARKET PERSPECTIVE

*   Municipal  bonds generally  posted  positive  returns during the fiscal year
    ended May 31, 1999.

*   Most of the gains,  however,  occurred in 1998 when a global  economic slump
    loomed and interest rates fell.

*   During the first five  months of 1999,  interest  rates  rebounded  and bond
    prices fell as the U.S.  economic  growth  engine  roared ahead and emerging
    market economies showed signs of recovery.

*   For the fiscal year, short- and intermediate-term  municipal bonds generally
    outperformed long-term municipals, which are more sensitive to interest rate
    changes.

*   Municipal  bonds  underperformed  Treasury bonds in 1998,  but  outperformed
    Treasurys during the first five months of 1999.

*   The  yield   difference   (spread)   between   high-quality  AAA  bonds  and
    lower-quality  BBB  bonds  narrowed  as  economic  conditions  improved  and
    lower-rated bonds were perceived as less risky.

*   Municipal  yields still look  attractive  relative to Treasury  yields on an
    after-tax basis.

MUNICIPAL CREDIT REVIEW

*   Continued strong economic growth created a very positive credit  environment
    in most areas of the continental U.S.

*   Tax receipts have risen substantially across most of the country.

*   Relatively  low  inflation  and  interest  rates have helped  municipalities
    control expenses.

*   Alaska and Hawaii were the only  states  showing  signs of credit  weakness.
    Alaska  took a hit from low oil prices in 1998,  while  reduced  spending by
    Asian tourists has slowed Hawaii's economy.

*   Health  care  was   practically   the  only  industry  sector  with  eroding
    fundamentals.   Hospitals   experienced   reduced   Medicare   and  Medicaid
    reimbursements.

LIMITED-TERM TAX-FREE

*   Limited-Term  Tax-Free's one-year return ranked in the top 20% of the fund's
    Lipper peer group.

*   Fund  performance  benefited  from a  neutral  stance  in 1999 in  terms  of
    interest  rate  sensitivity.  Funds  that  underperformed  tended to be more
    aggressive,  and were hurt when  interest  rates rose  instead of falling as
    expected.

*   Limited-Term  Tax-Free also benefited from credit  upgrades in New York City
    and Detroit. The fund owned bonds issued by those cities.

*   The  portfolio's  BBB  position  was reduced  because the  narrowing  spread
    between AAA and BBB bonds made owning BBB securities less rewarding.

*   We will likely  maintain the fund's  neutral  stance in the near term due to
    interest rate and economic uncertainties.

INTERMEDIATE-TERM TAX-FREE

*   Intermediate-Term  Tax-Free's  one-year  return ranked in the top 30% of the
    fund's Lipper peer group.

*   The fund's 30-day SEC yield as of May 31 was also significantly  higher than
    the average of its Lipper peers.

[left margin]

            LIMITED-TERM TAX-FREE
                  (TWTSX)
TOTAL RETURNS:               AS OF 5/31/99
   6 Months                          1.22%*
   1 Year                            4.15%
30-DAY SEC YIELD:                    3.42%
INCEPTION DATE:                     3/1/93
NET ASSETS:                  $41.1 million

          INTERMEDIATE-TERM TAX-FREE
                  (TWTIX)
TOTAL RETURNS:               AS OF 5/31/99
   6 Months                          0.50%*
   1 Year                            4.07%
30-DAY SEC YIELD:                    3.91%
INCEPTION DATE:                     3/2/87
NET ASSETS:                 $149.7 million

* Not annualized.

Investment terms are defined in the Glossary on pages 46-47.


2      1-800-345-2021


Report Highlights
- --------------------------------------------------------------------------------
                                                                    (Continued)

*   Fund  performance  benefited  from a  neutral  stance  in 1999 in  terms  of
    interest  rate  sensitivity.  Funds  that  underperformed  tended to be more
    aggressive,  and were hurt when  interest  rates rose  instead of falling as
    expected.

*   We  improved  the  portfolio's  overall  credit  quality by  increasing  its
    position  in  insured  AAA  bonds.  The  narrowing  spread  between  AAA and
    lower-rated bonds helped make insured bonds attractive.

*   We will likely  maintain the fund's  neutral  stance in the near term due to
    interest rate and economic uncertainties.

LONG-TERM TAX-FREE

*   Long-Term  Tax-Free's  one-year  return outpaced the average total return of
    the fund's Lipper peer group.

*   The fund's  30-day SEC yield as of May 31 was also  higher  than the average
    yield of the Lipper peer group.

*   Long-Term  Tax-Free had a longer  duration (more interest rate  sensitivity)
    than the average of its peer group.  That caused the portfolio to outperform
    when interest rates fell but underperform when rates rose.

*   The investment  team used discount  bonds to help the portfolio  achieve its
    longer duration.

*   We  improved  the  portfolio's  overall  credit  quality by  increasing  its
    position in AAA bonds.  The  narrowing  spread  between AAA and  lower-rated
    bonds helped make the higher-quality bonds attractive.

*   The portfolio  remains  positioned  with a slightly long duration,  based on
    expectations  for stable or possibly  lower yields for  long-term  municipal
    bonds.

HIGH-YIELD MUNICIPAL

*   High-Yield  Municipal's  one-year  return  ranked first in the fund's Lipper
    peer group.

*   The fund's 30-day SEC yield as of May 31 was also significantly  higher than
    the average yield of the Lipper peer group.

*   A  fee  waiver,   which  helped  the  portfolio  compete  with  older,  more
    established funds, was one key reason why the fund performed so well.

*   The fee waiver expired on April 30. However,  High-Yield Municipal's expense
    ratio of  approximately  0.64% remains well below the average for its Lipper
    peer group, which was 1.23% as of May 31.

*   Timely adjustments to duration (a measure of interest rate sensitivity) also
    helped fund  performance.  The  portfolio was more  sensitive  (had a longer
    duration) when rates were falling and less so (had a shorter  duration) when
    rates rose.

*   Strong  credit  analysis  also  helped the fund avoid  problem  sectors  and
    securities, and locate good values among lower-rated and unrated bonds.

*   We're likely to maintain a shorter  duration in the near term because of the
    risk of higher interest rates.  But most of our emphasis will continue to be
    on finding good values and avoiding credit traps.

[right margin]

            LONG-TERM TAX-FREE
                  (TWTLX)
TOTAL RETURNS:               AS OF 5/31/99
   6 Months                         -0.61%*
   1 Year                            3.44%
30-DAY SEC YIELD:                    4.37%
INCEPTION DATE:                     3/2/87
NET ASSETS:                 $117.6 million

            HIGH-YIELD MUNICIPAL
                  (ABHYX)
TOTAL RETURNS:               AS OF 5/31/99
   6 Months                          1.90%*
   1 Year                            6.18%
30-DAY SEC YIELD:                    5.31%
INCEPTION DATE:                    3/31/98
NET ASSETS:                  $42.1 million

* Not annualized.

Investment terms are defined in the Glossary on pages 46-47.


                                                  www.americancentury.com      3


Market Perspective from Randall W. Merk
- --------------------------------------------------------------------------------
/photo of Randall W. Merk/
Randall W. Merk, chief investment officer of fixed income

MUNICIPAL BOND PERFORMANCE

     Municipal bonds generally posted positive returns during the year ended May
31, 1999,  though most of their gains occurred in 1998 when interest rates fell.
In the first five months of 1999,  tax-free bond prices  mostly  declined due to
strong economic growth, inflation concerns, and rising interest rates.

     Short-  and  intermediate-term   municipal  bonds  outperformed   long-term
municipals,  which  are  more  sensitive  to  interest  rate  changes  (see  the
accompanying  bond index returns  table).  Also,  lower-quality  municipal bonds
(those rated BBB or lower) generally outperformed  higher-rated (A to AAA) bonds
as strong  economic  conditions  have  caused the yield gap  between  lower- and
higher-rated bonds to narrow.

ECONOMIC ENGINE SPUTTERS BUT REGAINS POWER

     At the beginning of last summer,  municipal  bonds  languished as investors
worried  that strong U.S.  economic  growth might  ignite  inflation.  That view
changed  radically in July when  protracted  economic and financial  problems in
Asia and Latin  America  threatened  to dampen  global  economic  growth.  Bonds
rallied as recessionary  expectations  increased.  To stem overseas problems and
boost the U.S. economy, the Federal Reserve (the Fed) lowered short-term U.S.
interest rates three times last fall.

     Winter  brought  another  shift.  The Fed's actions seemed to achieve their
intended result--U.S.  economic growth accelerated while parts of Asia and Latin
America showed signs of stabilizing.  Better-than-expected  U.S. economic growth
and other indications that higher inflation might be ahead caused bond yields to
retrace much of the ground  they'd  covered in 1998 (see the  acompanying  yield
curve graph).  May brought word that the Fed was leaning toward raising interest
rates, which further dampened bond investors' moods.

TREASURYS FALTER AS MUNICIPALS GAIN GROUND

     In 1998,  despite  falling  interest  rates,  municipals  were hamstrung by
unfavorable  supply and demand  conditions and lagged  Treasury  securities.  By
October,  the difference  (spread) between  municipal and Treasury yields was as
small as it had been in a decade, indicating that Treasury bonds were relatively
expensive and municipal bonds were comparatively undervalued.

     As 1999 unfolded,  however, municipal bonds benefited from decreased supply
and increased demand,  helping them to regain  considerable ground on Treasurys.
Even after outperforming Treasurys in recent months, municipal bonds continue to
offer attractive yields on a tax-equivalent  basis. As of May 31, an investor in
the highest  federal  tax bracket  (39.6%)  could earn a  tax-adjusted  yield of
nearly 7.4% on a 10-year AAA-rated  municipal bond, well above the 5.6% yield on
a 10-year U.S. Treasury bond.

[left margin]

"MUNICIPAL BONDS GENERALLY POSTED POSITIVE RETURNS DURING THE YEAR ENDED MAY 31,
1999."

MUNICIPAL BOND INDEX RETURNS
FOR THE YEAR ENDED MAY 31, 1999
   MERRILL LYNCH 0- TO 3-YEAR
      MUNICIPAL INDEX                4.58%
   LEHMAN BROS. 5-YEAR
      MUNICIPAL GO INDEX             4.90%
   LEHMAN BROS. LONG-TERM
      MUNICIPAL BOND INDEX           4.35%

Source: Lipper Inc. and Russell/Mellon Analytical Services

[line graph - data below]

SHIFTING MUNICIPAL YIELD CURVES

YEARS TO
MATURITY      5/31/98           11/30/98            5/31/99
1              3.80%              3.19%              3.36%
2              3.95%              3.49%              3.59%
3              4.06%              3.64%              3.80%
4              4.15%              3.76%              3.98%
5              4.20%              3.86%              4.12%
6              4.27%              3.96%              4.22%
7              4.34%              4.05%              4.31%
8              4.41%              4.13%              4.38%
9              4.48%              4.21%              4.46%
10             4.55%              4.29%              4.54%
11             4.62%              4.38%              4.62%
12             4.69%              4.47%              4.70%
13             4.77%              4.56%              4.78%
14             4.84%              4.65%              4.86%
15             4.92%              4.73%              4.95%
16             4.95%              4.77%              4.98%
17             4.98%              4.80%              5.01%
18             5.00%              4.84%              5.04%
19             5.03%              4.87%              5.08%
20             5.05%              4.91%              5.12%
21             5.05%              4.91%              5.12%
22             5.05%              4.91%              5.13%
23             5.05%              4.92%              5.14%
24             5.06%              4.92%              5.15%
25             5.06%              4.93%              5.16%
26             5.06%              4.93%              5.16%
27             5.06%              4.93%              5.16%
28             5.07%              4.94%              5.17%
29             5.07%              4.94%              5.17%
30             5.08%              4.95%              5.18%

Source: Bloomberg Financial Markets


4      1-800-345-2021


Municipal Credit Review
- --------------------------------------------------------------------------------

FAVORABLE CREDIT TRENDS

     U.S.  economic  growth  translated  into positive  municipal  credit trends
during the year ended May 31, 1999.  The economy's  strength was evident  during
the  first  quarter  of  1999,  when  it grew at an  annual  rate of 4.3%  after
increasing  at a 3.9% clip in 1998.  Unemployment  hovered  near  30-year  lows,
falling to 4.2% in May. In  response,  tax  receipts  -- from sales,  corporate,
personal income,  capital gains, and property taxes -- rose substantially across
most of the country.

     The first quarter of 1999 also marked the  fourteenth  consecutive  quarter
when municipal credit rating upgrades outpaced downgrades.  Overall,  there were
nearly two  municipal  credit  upgrades for every  downgrade  during the last 12
months.  The generally positive municipal credit environment is reflected in the
accompanying map, which shows each state's credit rating as of May 31.

SECTOR ANALYSIS

     Bonds backed by tax  collections  continued to benefit from the  nationwide
economic expansion.  Low interest and inflation rates also helped many municipal
issuers control  expenses,  boosting their financial  health and credit ratings.
Bonds backed by the revenue from specific municipal projects or entities -- such
as toll roads -- generally also improved their financial backing.

     However,  there was one  sector  that  struggled.  Health  care  bonds were
afflicted  with  a  growing  list  of  ailments,  most  importantly  the  recent
reductions in Medicare and Medicaid  reimbursements  due to the Balanced  Budget
Act of 1997.  Those  challenges,  coupled with increased  managed care pressures
within the industry and growing losses from physician group practices,  prompted
several downgrades in the health care sector.

REGIONAL PERFORMANCE

     Most  states  continued  to  enjoy   stable-to-improving   credit  quality.
California was one of the year's biggest success  stories,  thanks in large part
to  strength  in  its  high-tech,   entertainment,   multi-media,   and  tourism
industries.  Nevada  remained  one of the  fastest  growing  states as Las Vegas
attracted more tourism dollars.  Population growth and economic expansion helped
Nevada's neighbors, including Arizona and Utah. The strength of the stock market
and Wall Street  benefited New York and New Jersey,  while record auto sales and
strong  manufacturing  activity  boosted the credit quality of upper  midwestern
states, including Michigan and Ohio.

     Alaska and Hawaii were the lone exceptions to all the good news. Alaska was
hurt by low oil prices in 1998, while Hawaii's credit quality  downgrade in 1998
was followed by Honolulu's in 1999.  Continued economic weakness in Japan caused
a  significant  reduction  in the  amount of money  spent in Hawaii by  Japanese
tourists.

[map chart - data below]

NATIONAL CREDIT QUALITY AS OF MAY 31, 1999

STATE                       S&P RATING
Alabama                         AA
Alaska                          AA
Arizona                         AA
Arkansas                        AA
California                      AA
Colorado                        AA
Connecticut                     AA-
Delaware                        AA+
District Of Columbia            BB
Florida                         AA+
Georgia                         AAA
Hawaii                          A+
Idaho                           AA
Illinois                        AA
Indiana                         AA
Iowa                            AA
Kansas                          AA
Kentucky                        AA
Louisiana                       A-
Maine                           AA+
Maryland                        AAA
Massachusetts                   AA-
Michigan                        AA+
Minnesota                       AAA
Mississippi                     AA
Missouri                        AAA
Montana                         AA-
Nebraska                        NR
Nevada                          AA
New Hampshire                   AA+
New Jersey                      AA+
New Mexico                      AA+
New York                        A
North Carolina                  AAA
North Dakota                    AA-
Ohio                            AA+
Oklahoma                        AA
Oregon                          AA
Pennsylvania                    AA-
Rhode Island                    AA-
South Carolina                  AAA
South Dakota                    AA
Tennessee                       AA+
Texas                           AA
Utah                            AAA
Vermont                         AA-
Virginia                        AAA
Washington                      AA+
West Virginia                   AA-
Wisconsin                       AA
Wyoming                         NR

Source: Standard & Poor's

CREDIT RATING DEFINITIONS

       CREDIT RATINGS ARE BASED ON AN ISSUER'S FINANCIAL STRENGTH AND ABILITY TO
PAY  INTEREST  AND  PRINCIPAL IN A TIMELY  MANNER.  IT'S  IMPORTANT TO NOTE THAT
CREDIT RATINGS ARE SUBJECTIVE; THEY ARE NOT ABSOLUTE STANDARDS OF QUALITY.

       *  AAA, AA, A, AND BBB ARE STANDARD & POOR'S HIGHEST LONG-TERM CREDIT
          RATINGS. BONDS IN THESE RATING CATEGORIES ARE CONSIDERED "INVESTMENT
          GRADE," MEANING THEY'RE RELATIVELY SAFE FROM DEFAULT.

       *  AAA--EXTREMELY STRONG ABILITY TO MEET FINANCIAL OBLIGATIONS.

       *  AA--VERY STRONG ABILITY TO MEET FINANCIAL OBLIGATIONS.

       *  A--STRONG ABILITY TO MEET FINANCIAL OBLIGATIONS.

       *  BBB--GOOD ABILITY TO MEET FINANCIAL OBLIGATIONS.

       *  BB--LESS VULNERABLE TO DEFAULT THAN OTHER LOWER-QUALITY ISSUES BUT DO
          NOT QUITE MEET INVESTMENT-GRADE STANDARDS.


                                                  www.americancentury.com      5


Limited-Term Tax-Free--Performance
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
TOTAL RETURNS AS OF MAY 31, 1999

                        LIMITED-TERM    MERRILL LYNCH 0- TO   SHORT/INTERMEDIATE MUNI DEBT FUNDS(2)
                          TAX-FREE       3-YEAR MUNI INDEX      AVERAGE RETURN     FUND'S RANKING
================================================================================================
<S>                      <C>                <C>                 <C>                  <C>
6 MONTHS(1) .............  1.22%               1.75%                0.94%                --
1 YEAR ..................  4.15%               4.58%                3.68%            7 OUT OF 38
================================================================================================
AVERAGE ANNUAL RETURNS
3 YEARS .................  4.81%               4.54%                4.61%           13 OUT OF 29
5 YEARS .................  4.75%               4.51%                4.68%           11 OUT OF 18
LIFE OF FUND ............  4.44%               4.28%               4.41%(3)        8 OUT OF 14(3)
</TABLE>

The fund's inception date was 3/1/93.

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

(2) According to Lipper Inc., an independent mutual fund ranking service.

(3) Since 3/31/93,  the date nearest the fund's  inception for which return data
    are available.

See pages 45-46 for more information about returns,  the comparative  index, and
Lipper fund rankings.

[mountain graph - data below]

GROWTH OF $10,000 OVER LIFE OF FUND
Value on 5/31/99
Limited-Term Tax-Free          $13,122
Merrill-Lynch 0- to 3-Year
   Muni Index                  $12,999
                                         Merrill-Lynch
                    Limited-Term          0- to 3-Year
                      Tax-Free             Muni Index
DATE                   VALUE                  VALUE
3/1/93                $10,000               $10,000
3/31/93               $10,014                $9,991
6/30/93               $10,132               $10,110
9/30/93               $10,227               $10,149
12/31/93              $10,337               $10,322
3/31/94               $10,322               $10,319
6/30/94               $10,426               $10,396
9/30/94               $10,524               $10,499
12/31/94              $10,591               $10,458
3/31/95               $10,790               $10,693
6/30/95               $10,964               $10,904
9/30/95               $11,110               $11,064
12/31/95              $11,305               $11,213
3/31/96               $11,364               $11,325
6/30/96               $11,434               $11,403
9/30/96               $11,564               $11,535
12/31/96              $11,721               $11,672
3/31/97               $11,768               $11,728
6/30/97               $12,007               $11,907
9/30/97               $12,204               $12,073
12/31/97              $12,378               $12,222
3/31/98               $12,501               $12,356
6/30/98               $12,627               $12,476
9/30/98               $12,892               $12,680
12/31/98              $13,012               $12,834
3/31/99               $13,112               $12,952
5/31/99               $13,122               $12,999

$10,000 investment made 3/1/93

The graph at left shows the growth of a $10,000  investment over the life of the
fund,  while the graph  below  shows the fund's  year-by-year  performance.  The
Merrill Lynch 0- to 3-Year  Municipal  Index is provided for  comparison in each
graph. Limited-Term Tax-Free's total returns include operating expenses (such as
transaction  costs and  management  fees) that reduce  returns,  while the total
returns of the index do not. 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.

[bar graph - data below]

ONE-YEAR RETURNS OVER LIFE OF FUND (PERIODS ENDING MAY 31)
                                      Merrill-Lynch
                  Limited-Term         0- to 3-Year
                    Tax-Free            Muni Index
DATE                 RETURN              RETURN
5/31/93*              0.76%               0.23%
5/31/94               3.26%               4.02%
5/31/95               5.00%               4.31%
5/31/96               4.32%               4.62%
5/31/97               4.49%               4.08%
5/31/98               5.79%               4.96%
5/31/99               4.15%               4.58%

* From 3/1/93 (the fund's inception date) to 5/31/93.


6      1-800-345-2021


Limited-Term Tax-Free--Q&A
- --------------------------------------------------------------------------------
/photo of Bryan Karcher/

     An interview with Bryan Karcher (pictured above) and Dave MacEwen (pictured
on page 21),  portfolio  managers on the  Limited-Term  Tax-Free fund investment
team.

HOW DID THE FUND PERFORM DURING ITS FISCAL YEAR ENDED MAY 31, 1999?

     Limited-Term  Tax-Free  performed well. For the 12 months ended May 31, the
fund  returned  4.15%,  compared  with  the  3.68%  average  return  of  the  38
"Short/Intermediate  Municipal Debt Funds" tracked by Lipper Inc. Based on those
returns, Limited-Term Tax-Free ranked in the top 20% of its Lipper peers.

WHAT  HELPED  LIMITED-TERM  TAX-FREE  PERFORM  BETTER  THAN THE  AVERAGE  OF ITS
COMPETITORS?

     As we entered  1999,  many of the fund  managers in the Lipper  group -- as
well as other market participants -- expected a global recession,  a weaker U.S.
economy,  and more interest rate cuts by the Federal Reserve.  Believers in this
outlook  tended  to  increase  the  duration  and  average   maturity  of  their
portfolios,  heightening the interest rate sensitivity of their funds to capture
more potential gains if interest rates fell.

     For our part, we took a contrarian  approach,  maintaining a neutral,  less
aggressive  stance. We did so because we thought that the strength  indicated in
the  economic  data  from the  last  quarter  of 1998  would  continue  into the
beginning of 1999 and cause a reversal of market sentiment.  That's exactly what
happened.  U.S.  economic  growth  remained  strong,  and interest rates rose in
anticipation of Fed action to raise rates to slow growth and head off inflation.

HOW DID YOU MAINTAIN THE PORTFOLIO'S NEUTRAL POSITION?

     The municipal bond market  experienced a great deal of  fluctuation  during
the first and  second  quarters  of 1999.  When the  market  sold off and buying
opportunities  presented  themselves at the longer end of our maturity range, we
extended duration a bit. Then we sold some of those positions to return duration
to a neutral position when the market rallied.

WHAT OTHER MOVES DID YOU MAKE DURING THE SECOND HALF OF THE FUND'S FISCAL YEAR?

     We reduced Limited-Term Tax-Free's holdings in BBB securities.  These bonds
tend to offer more yield than  higher-rated  securities to reward  investors for
the additional credit risk.

     We started to reduce our  position in  lower-rated  bonds toward the end of
1998 because we felt these issues did not offer enough of a yield advantage over
higher-rated  securities with  comparable  maturities.  As a result,  the fund's
investments in BBB  securities  dropped to about 11% of the portfolio by the end
of May.

     We  reallocated  the proceeds from the BBB assets into  securities  that we
believed  had less  credit  risk but  still  offered  attractive  yields.  These
included AAA callable securities -- which can be redeemed by the issuer before

[right margin]

YIELDS AS OF MAY 31, 1999
   30-DAY SEC YIELD                   3.42%
   30-DAY TAX-EQUIVALENT YIELDS
      28.0% TAX BRACKET               4.75%
      31.0% TAX BRACKET               4.96%
      36.0% TAX BRACKET               5.34%
      39.6% TAX BRACKET               5.66%

PORTFOLIO AT A GLANCE
                             5/31/99           5/31/98
NUMBER OF SECURITIES           40                36
WEIGHTED AVERAGE
   MATURITY                  3.5 YRS           3.6 YRS
AVERAGE DURATION             3.0 YRS           2.9 YRS
EXPENSE RATIO                 0.51%            0.52%*

* Annualized.

PORTFOLIO COMPOSITION BY
CREDIT RATING
                % OF FUND INVESTMENTS
               AS OF             AS OF
              5/31/99          11/30/98
AAA             62%               57%
AA              21%               21%
A                6%                6%
BBB             11%               16%

Ratings provided by Standard & Poor's.  See Credit Rating  Definitions on page 5
for more information.

Investment terms are defined in the Glossary on pages 46-47.


                                                  www.americancentury.com      7


Limited-Term Tax-Free--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

the bond's  maturity  date -- and  AA-rated  bonds with unique  structures.  For
example,  we were able to pick up additional yield by investing in AA bonds with
mandatory  "puts" -- they  provided the right to sell to a specified  buyer at a
specified time and price.

WAS THE FUND'S PERFORMANCE HELPED BY ANY CREDIT UPGRADES?

     Yes, it was. For example,  New York City and Detroit were upgraded from BBB
to A. New York City, in particular,  was helped by the strength of the financial
markets.

     On the heels of this  credit  improvement,  we  decided to sell most of the
fund's New York City bonds to take profits.  Another reason we decided to reduce
this  position  was our  concern  that  the  liquidity  crunch  suffered  by the
financial markets in 1998 could continue to adversely affect Wall Street.

ONE WAY OF DETERMINING THE RELATIVE VALUE OF MUNICIPAL SECURITIES IS COMPARING
THEIR YIELDS WITH TREASURY YIELDS. HOW DO MUNICIPAL AND TREASURY YIELDS COMPARE
THESE DAYS?

     Treasury  securities have slumped quite a bit in 1999 and their yields have
spiked  upward.  As a result,  municipal  bonds  are no longer as  comparatively
undervalued  as they  were at the end of  1998.  That's  a  significant  change,
because six to eight months ago municipal  yields  equaled  comparable  maturity
Treasury yields. In other words, any taxable investor would have earned a higher
tax-adjusted  yield  from a  municipal  bond  than  from a  comparable  maturity
Treasury   bond.   As  Randy  Merk  mentions  on  the  bottom  of  page  4,  the
tax-equivalent  yields  for  municipal  bonds  are  still  attractive  for  high
tax-bracket investors relative to Treasury yields, but not as attractive as they
were at the end of 1998.

WHAT IS YOUR OUTLOOK FOR THE MUNICIPAL MARKET?

     From an interest rate standpoint,  that's a tough call. The Fed has already
tightened once this year, and it's unclear if it will have to tighten again.
That's causing some market uncertainty.

     From a supply and demand  standpoint,  the picture is a bit more clear.  We
believe  that  new  issuance  will  remain  low,   unless  interest  rates  drop
dramatically. That should help the municipal market's performance.

GIVEN THAT OUTLOOK, HOW DO YOU PLAN TO POSITION  LIMITED-TERM  TAX-FREE OVER THE
NEXT FEW MONTHS?

     We intend to pursue a neutral  course,  closely  watching  the  economy for
changes  that  could  affect  market  conditions.  As  always,  we'll  look  for
opportunities to increase the fund's yield,  buying securities that offer a good
balance of risk and return.

[left margin]

"WE BELIEVE THAT NEW ISSUANCE WILL CONTINUE TO BE LOW, UNLESS INTEREST RATES
DROP DRAMATICALLY. THAT SHOULD HELP THE MUNICIPAL MARKET'S PERFORMANCE."

TOP FIVE STATES (AS OF 5/31/99)
                   % OF FUND INVESTMENTS
MICHIGAN                  10.6%
OHIO                       9.9%
ARIZONA                    9.9%
TEXAS                      6.6%
MISSOURI                   6.4%

TOP FIVE STATES (AS OF 11/30/98)
                   % OF FUND INVESTMENTS
OHIO                      10.6%
MICHIGAN                   9.7%
NEW YORK                   9.5%
CALIFORNIA                 7.1%
MISSOURI                   6.9%


8      1-800-345-2021


Limited-Term Tax-Free--Schedule of Investments
- --------------------------------------------------------------------------------

MAY 31, 1999

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
MUNICIPAL SECURITIES--97.4%
ALASKA--4.4%
                   $  850  Alaska Industrial Development &
                              Export Auth. Power Rev.,
                              Series 1998-1, (Snettisham
                              Hydroelectric), 4.50%, 1/1/00         $   856
                    1,000  Alaska Industrial Development &
                              Export Auth. Rev., Series
                              1998 A, 4.50%, 4/1/01 (MBIA)            1,010
                                                                   ---------
                                                                      1,866
                                                                   ---------
ARIZONA--9.9%
                    1,500  Arizona Transportation Board
                              Excise Tax Rev., (Maricopa
                              County), 5.60%, 7/1/02
                              (AMBAC)                                 1,575
                    1,025  Maricopa County COP, 5.625%,
                              6/1/00                                  1,036
                    1,000  Maricopa County Unified School
                              District No. 97 GO, Series
                              1999 G, (Deer Valley Project of
                              1996), 5.60%, 7/1/00 (FSA)(1)           1,025
                      555  Pinal County COP, 4.25%,
                              12/1/05 (MBIA)                            556
                                                                   ---------
                                                                      4,192
                                                                   ---------
CALIFORNIA--3.0%
                    1,225  Garden Grove Agency Community
                              Development Tax Allocation,
                              (Garden Grove Community),
                              5.20%, 10/1/01                          1,260
                                                                   ---------
           COLORADO--4.9%
                    1,000  Denver Colorado City & County
                              Airport Rev., Series 1996 B,
                              5.25%, 11/15/02 (MBIA)                  1,038
                    1,000  Highlands Ranch Metropolitan
                              District #2 GO, 6.00%,
                              6/15/02 (FSA)                           1,060
                                                                   ---------
                                                                      2,098
                                                                   ---------
FLORIDA--4.5%
                      210  Escambia County Housing
                              Finance Auth. Single Family
                              Mortgage Rev., Series 1998 A,
                              (Multi-County Program), 4.70%,
                              10/1/05 (GNMA/FNMA)                       212
                    1,550  Jacksonville Electric Auth. Rev.,
                              (St. John's River), 6.00%,
                              10/1/04(2)                              1,690
                                                                   ---------
                                                                      1,902
                                                                   ---------
ILLINOIS--2.5%
                    1,000  Illinois Civic Center Rev., 5.00%,
                              12/15/05 (AMBAC)                        1,039
                                                                   ---------

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
INDIANA--2.5%
                   $1,000  Central High School Building Corp.
                              Rev., 5.25%, 2/1/04 (AMBAC)           $ 1,044
                                                                   ---------
KENTUCKY--2.3%
                    1,000  Carrollton & Henderson Public
                              Energy Auth. Gas Rev., Series
                              1998 B, 4.20%, 1/1/06 (FSA)               988
                                                                   ---------
MICHIGAN--10.6%
                    1,000  Detroit Downtown Development
                              Auth. Tax Increment Rev., Series
                              1998 C, (Development Area
                              No. 1), 4.10%, 7/1/03 (MBIA)            1,000
                      880  Detroit GO, Series 1995 A,
                              5.40%, 5/1/00                             895
                      500  Detroit GO, Series 1995 B,
                              6.50%, 4/1/02                             531
                    1,045  Michigan Hospital Financing Auth.
                              Rev., Series 1999 A, (Charity
                              Obligation Group), 4.25%,
                              11/1/06                                 1,024
                    1,000  Michigan Municipal Board Auth.
                              Rev., 5.00%, 12/1/05                    1,044
                                                                   ---------
                                                                      4,494
                                                                   ---------
MISSOURI--6.4%
                    1,675  North Kansas City School District
                              GO, 5.00%, 3/1/00                       1,698
                    1,000  Springfield State Highway
                              Improvement Corp. Rev.,  5.05%,
                              8/1/03 (AMBAC)                          1,039
                                                                   ---------
                                                                      2,737
                                                                   ---------
MONTANA--2.4%
                    1,000  Forsyth Pollution Control Rev.,
                              Series 1998 B, 4.75%, 5/1/33            1,014
                                                                   ---------
NEBRASKA--2.4%
                    1,000  American Public Energy Agency
                              Nebraska Gas Supply Rev.,
                              Series 1999 A, (Nebraska
                              Public Gas Agency), 3.35%,
                              6/1/00 (AMBAC)                          1,000
                                                                   ---------
NEW JERSEY--5.5%
                      500  New Jersey Educational Facilities
                              Auth. Rev., Series 1998 B, (St.
                              Peters College), 4.60%, 7/1/01            505
                    1,750  West Windsor Plainsboro GO,
                              5.25%, 12/1/02 (FGIC)                   1,831
                                                                   ---------
                                                                      2,336
                                                                   ---------
NEW YORK --6.4%
                    2,145  New York City Municipal
                              Assistance Corp. Rev., Series
                              1997 I, 5.25%, 7/1/02                   2,229

See Notes to Financial Statements


                                                  www.americancentury.com      9


Limited-Term Tax-Free--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------

                   $  500  New York State Dormitory Auth.
                              Rev., Series 1998 I, (New York
                              Downtown Hospital), 4.80%,
                              2/15/06                               $   506
                                                                   ---------
                                                                      2,735
                                                                   ---------
OHIO--9.9%
                    2,070  Ohio Building Auth. Rev., Series
                              1997 A, (Highway Safety
                              Building), 5.00%, 10/1/03
                              (AMBAC)                                 2,154
                      500  Ohio Public Facilities Commission
                              Rev., Series 1998 A, 4.50%,
                              12/1/04                                   510
                    1,500  Ohio Water Development Auth.
                              Pollution Control Facilities Rev.,
                              5.00%, 6/1/04 (MBIA)                    1,560
                                                                   ---------
                                                                      4,224
                                                                   ---------
RHODE ISLAND--1.4%
                      570  Rhode Island Economic
                              Development Corp. Airport Rev.,
                              Series 1998 A, 5.00%, 7/1/03
                              (FSA)                                     589
                                                                   ---------
SOUTH CAROLINA--4.5%
                      855  Piedmont Municipal Power
                              Agency Rev., Series 1991 A,
                              6.00%, 1/1/02 (FGIC)                      897
                    1,000  South Carolina Public Service
                              Auth. Rev., Series 1998 A,
                              5.00%, 1/1/02                           1,025
                                                                   ---------
                                                                      1,922
                                                                   ---------
TENNESSEE--4.9%
                    1,050  Jackson Hospital Rev., (Madison
                              County General Hospital), 4.50%,
                              4/1/00 (AMBAC)                          1,061
                    1,000  Tennergy Corp. Gas Rev., 4.50%,
                              6/1/04 (MBIA)                           1,015
                                                                   ---------
                                                                      2,076
                                                                   ---------

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
TEXAS--6.6%
                   $1,000  Colorado River Municipal Water
                              District Rev., Series 1991 A,
                              8.50%, 1/1/01, Prerefunded at
                              100% of Par (AMBAC)(3)                $ 1,074
                      685  Denison Hospital Auth. Rev.,
                              (Texoma Medical Center), 5.00%,
                              8/15/00                                   691
                    1,000  Houston Water & Sewer System
                              Rev., Series 1999 A, 5.25%,
                              12/1/05 (FSA)                           1,057
                                                                   ---------
                                                                      2,822
                                                                   ---------
WISCONSIN--2.4%
                    1,000  Wisconsin Rural Water
                              Construction Loan Program
                              Community Rev., 4.25%,
                              9/15/00 (GIC: FGIC)                     1,010
                                                                   ---------
TOTAL MUNICIPAL SECURITIES                                           41,348
                                                                   ---------
   (Cost $40,828)

SHORT-TERM MUNICIPAL SECURITIES--2.6%
NEW YORK
                    1,100  New York GO, Series 1992 B,
                              VRDN, 3.30%, 6/1/99 (FGIC)
                              (SBBPA: General Electric
                              Capital Corp.)                          1,100
                                                                   ---------
   (Cost $1,100)

TOTAL INVESTMENT SECURITIES--100.0%                                 $42,448
                                                                   =========
   (Cost $41,928)

                                              See Notes to Financial Statements


10      1-800-345-2021


Limited-Term Tax-Free--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

NOTES TO SCHEDULE OF INVESTMENTS

AMBAC = AMBAC Assurance Corporation

COP = Certificates of Participation

FGIC = Financial Guaranty Insurance Co.

FNMA = Federal National Mortgage Association

FSA = Financial Security Assurance Inc.

GIC = Guaranteed Investment Contract

GNMA = Government National Mortgage Association

GO = General Obligation

MBIA = MBIA Insurance Corp.

SBBPA = Standby Bond Purchase Agreement

VRDN = Variable Rate Demand Note.  Interest  reset date is indicated and used in
calculating the weighted average portfolio maturity. Rate shown is effective May
31, 1999.

(1)  When-issued security.

(2)  Security,  or a portion thereof,  has been segregated at the custodian bank
     for a when-issued security.

(3)  Escrowed to maturity in U.S.  government  securities and or state and local
     government securities.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* principal amount of each investment

* the market value of each investment

* the percentage of investments in each state

* the percent and dollar breakdown of each investment category

See Notes to Financial Statements


                                                 www.americancentury.com      11


Intermediate-Term Tax-Free--Performance
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
TOTAL RETURNS AS OF MAY 31, 1999

                  INTERMEDIATE-TERM    LEHMAN 5-YEAR    INTERMEDIATE MUNICIPAL DEBT FUNDS(2)
                       TAX-FREE           GO INDEX        AVERAGE RETURN    FUND'S RANKING
==========================================================================================
<S>                    <C>             <C>                <C>                <C>
6 MONTHS(1) ..........  0.50%              1.42%              0.50%              --
1 YEAR ...............  4.07%              4.90%              3.72%         34 OUT OF 134
==========================================================================================
AVERAGE ANNUAL RETURNS
3 YEARS ..............  5.98%              5.97%              5.85%         46 OUT OF 114
5 YEARS ..............  5.82%              5.91%              5.81%         40 OUT OF 88
10 YEARS .............  6.35%              6.74%              6.58%         17 OUT OF 24
</TABLE>

The fund's inception date was 3/2/87.

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

(2) According to Lipper Inc., an independent mutual fund ranking service.

See pages 45-46 for more information about returns,  the comparative  index, and
Lipper fund rankings.

[mountain graph - data below]

GROWTH OF $10,000 OVER 10 YEARS
Value on 5/31/99
Intermediate-Term Tax-Free $18,516
Lehman 5-Year GO Index $19,201

                 Intermediate-Term       Lehman 5-Year
                      Tax-Free              GO Index
DATE                   VALUE                 VALUE
5/31/89               $10,000               $10,000
5/31/90               $10,583               $10,738
5/31/91               $11,551               $11,740
5/31/92               $12,504               $12,778
5/31/93               $13,588               $13,977
5/31/94               $13,958               $14,411
5/31/95               $14,941               $15,404
5/31/96               $15,556               $16,134
5/31/97               $16,535               $17,115
5/31/98               $17,791               $18,304
5/31/99               $18,516               $19,201

$10,000 investment made

The graph at left shows the growth of a $10,000  investment over 10 years, while
the graph below shows the fund's year-by-year performance.  The Lehman 5-Year GO
Index is provided for  comparison  in each graph.  Intermediate-Term  Tax-Free's
total  returns  include  operating  expenses  (such  as  transaction  costs  and
management  fees) that reduce  returns,  while the total returns of the index do
not. 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.

[bar graph - data below]

ONE-YEAR RETURNS OVER 10 YEARS (PERIODS ENDING MAY 31)
                Intermediate-Term      Lehman 5-Year
                    Tax-Free             GO Index
DATE                 RETURN               RETURN
5/31/90               5.83%               7.38%
5/31/91               9.15%               9.33%
5/31/92               8.25%               8.84%
5/31/93               8.67%               9.39%
5/31/94               2.72%               3.10%
5/31/95               7.04%               6.89%
5/31/96               4.12%               4.74%
5/31/97               6.29%               6.08%
5/31/98               7.60%               6.95%
5/31/99               4.07%               4.90%


12      1-800-345-2021


Intermediate-Term Tax-Free--Q&A
- --------------------------------------------------------------------------------
/photo of Ken Salinger/

     An   interview   with   Ken   Salinger,   a   portfolio   manager   on  the
Intermediate-Term Tax-Free fund investment team.

HOW DID THE FUND PERFORM DURING ITS FISCAL YEAR ENDED MAY 31, 1999?

     Intermediate-Term  Tax-Free performed well. For the 12 months ended May 31,
the fund  returned  4.07%,  compared  with the 3.72%  average  return of the 134
"Intermediate  Municipal  Debt  Funds"  tracked  by Lipper  Inc.  Based on these
returns,  Intermediate-Term  Tax-Free ranked in the top 30% of its Lipper peers.
Furthermore,  the  fund's  30-day  SEC yield was 3.91%  compared  with the 3.68%
average of the Lipper group.

WHAT HELPED  INTERMEDIATE-TERM  TAX-FREE  PERFORM BETTER THAN THE AVERAGE OF ITS
COMPETITORS?

     We took a more neutral, less aggressive stance with the portfolio than many
other fund managers did. This  contrarian  view was based on our belief that the
economic strength apparent at the end of 1998 would continue into 1999 and cause
a reversal of market sentiment. That's exactly what happened.

     Even though  economic  indicators such as home and retail sales were strong
at the end of 1998, many market observers expected a global recession,  a weaker
U.S. economy,  and continued  interest rate cuts by the Federal Reserve in 1999.
Instead, U.S. economic growth continued to be strong, and interest rates rose in
anticipation of Fed action to raise rates to slow growth and head off inflation.

HOW DID YOU MAINTAIN THE PORTFOLIO'S NEUTRAL POSITION?

     The  municipal  market  fluctuated a great deal during the first and second
quarters of 1999.  When the market sold off and buying  opportunities  presented
themselves  at the longer end of our  maturity  range,  we  extended  the fund's
maturity a bit.  When the market  rallied,  we sold some of these  positions  to
return the fund's duration to a neutral position.

HOW DID YOU STRUCTURE THE PORTFOLIO IN TERMS OF MATURITY?

     As bond market sentiment shifted from bullish to bearish, we structured the
fund in a bulleted  fashion.  That is, we  concentrated  the fund's  investments
around the average  maturity  of the fund,  between  eight and nine years.  This
strategy paid off because it reduced our holdings in  longer-term  bonds,  which
were hurt most by rising interest rates.

     During the last three months of the period,  however,  we spread the fund's
investments more broadly across the maturity spectrum.

HOW DID YOU MANAGE THE PORTFOLIO'S  CREDIT QUALITY?

     As 1998 came to a close, it became apparent that lower-rated securities did
not offer a significant yield advantage over AAA securities.  Therefore, we sold
some lower-rated bonds and moved the assets into insured bonds with AAA ratings.

[right margin]

YIELDS AS OF MAY 31, 1999
   30-DAY SEC YIELD
                                    3.91%
   30-DAY TAX-EQUIVALENT YIELDS
      28.0% TAX BRACKET             5.43%
      31.0% TAX BRACKET             5.67%
      36.0% TAX BRACKET             6.11%
      39.6% TAX BRACKET             6.47%

PORTFOLIO AT A GLANCE
                             5/31/99           5/31/98
NUMBER OF SECURITIES           109               101
WEIGHTED AVERAGE
   MATURITY                  8.7 YRS           7.9 YRS
AVERAGE DURATION             5.5 YRS           5.4 YRS
EXPENSE RATIO                 0.51%            0.51%*

* Annualized.

PORTFOLIO COMPOSITION BY
CREDIT RATING
                  % OF FUND INVESTMENTS
                 AS OF             AS OF
                5/31/99          11/30/98
AAA               79%               73%
AA                10%               12%
A                  8%               11%
BBB                3%                4%

Ratings provided by Standard & Poor's.  See Credit Rating  Definitions on page 5
for more information.

Investment terms are defined in the Glossary on pages 46-47.


                                                 www.americancentury.com      13


Intermediate-Term Tax-Free--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

WHY DO YOU END UP INVESTING IN CERTAIN STATES AND NOT OTHERS?

     Among the key factors are supply and demand.  Our  strategy has been to try
to  purchase  securities  from  states  where  issuance  is  high or  demand  is
relatively low (resulting in higher yields and lower prices) and sell bonds from
states where there is some  combination  of lower  supply or higher  demand that
drives up prices (and pushes down yields).  The fund's largest stakes at the end
of the period were in New York, Texas, and Washington (see the table at left).

     We should also add that municipal bond issuance has decreased significantly
so far in 1999  because  so many  municipalities  took  advantage  of  declining
interest rates to refinance  their debt in 1998. The decreased  supply this year
has helped the performance of municipal bonds.

IN THE FUND'S LAST REPORT, THE RELATIVE VALUE OF MUNICIPAL SECURITIES COMPARED
FAVORABLY WITH TREASURY BONDS. HOW DO MUNICIPAL AND TREASURY YIELDS COMPARE
THESE DAYS?

     So far in 1999,  Treasury  securities  have  slumped  quite a bit and their
yields  have  spiked  upward.  As a  result,  municipal  bonds  are no longer as
undervalued  compared with Treasurys as they were at the end of 1998.  This is a
significant  change; six to eight months ago municipal yields were equivalent to
comparable  maturity Treasury yields. That means any taxable investor would have
earned a higher  tax-adjusted yield from a municipal bond than from a comparable
maturity Treasury bond. The tax-equivalent  yields for municipal bonds are still
attractive for high tax-bracket  investors  relative to Treasury yields, but not
as attractive as they were at the end of 1998.

WHAT IS YOUR OUTLOOK FOR THE MUNICIPAL MARKET?

     Inflation  concerns  prompted the Federal  Reserve to raise its  short-term
interest rate target at the end of June in an effort to slow economic  growth to
a more-sustainable,  non-inflationary pace. The bond market took a positive view
of the Fed's action and rallied  slightly on the news.  Bond yields fell because
the rate hike indicated to many  observers that the Fed remains  vigilant on the
inflation front.

     However,  because  there's still strength in the latest  economic  figures,
municipal bond yields have continued to reflect  expectations that the Fed could
raise  short-term  interest rates again before the end of 1999. The big question
is whether  economic  growth will remain overly strong and spark  additional Fed
interest rate hikes, or whether those concerns are unnecessarily bearish.

GIVEN THAT OUTLOOK, HOW DO YOU PLAN TO POSITION  INTERMEDIATE-TERM TAX-FREE OVER
THE NEXT FEW MONTHS?

     We expect to continue with a neutral stance,  closely  watching the economy
for signs of changing market conditions.  In addition,  since neither short- nor
longer-term  municipal  securities  look  as if  they  will  offer  particularly
intriguing  opportunities,  we'll aim to concentrate the portfolio's holdings on
securities with maturities near its average maturity, around eight years.

[left margin]

"OUR STRATEGY HAS BEEN TO TRY TO PURCHASE SECURITIES FROM STATES WHERE ISSUANCE
IS HIGH OR DEMAND IS RELATIVELY LOW."

TOP FIVE STATES (AS OF 5/31/99)
                  % OF FUND INVESTMENTS
NEW YORK                 13.1%
TEXAS                    13.1%
WASHINGTON               11.9%
MASSACHUSETTS             7.7%
PENNSYLVANIA              5.6%

TOP FIVE STATES (AS OF 11/30/98)
                  % OF FUND INVESTMENTS
NEW YORK                 14.6%
TEXAS                    14.2%
WASHINGTON               13.6%
MASSACHUSETTS             7.6%
CALIFORNIA                5.9%


14      1-800-345-2021


Intermediate-Term Tax-Free--Sch. of Investments
- --------------------------------------------------------------------------------

MAY 31, 1999

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
MUNICIPAL SECURITIES--99.8%
ALABAMA--1.1%
                   $1,535  Russell County Rev., Series
                              1999 B, 5.375%, 12/1/13
                              (AMBAC)                               $  1,576
                                                                   ----------
ALASKA--1.1%
                    1,130  Alaska Industrial Development &
                              Export Auth. Power Rev.,
                              (Snettisham Hydroelectric),
                              5.25%, 1/1/04 (AMBAC)                    1,173
                      500  Anchorage Hospital Rev., (Sisters
                              of Providence), 6.50%, 10/1/99             505
                                                                   ----------
                                                                       1,678
                                                                   ----------
ARIZONA--0.7%
                    1,000  Phoenix Industrial Development
                              Auth. Single Family Mortgage
                              Rev., Series 1998 A, 6.60%,
                              12/1/29
                              (GNMA/FNMA/FHLMC)                        1,088
                                                                   ----------
CALIFORNIA--3.0%
                    2,000  California Housing Finance Agency
                              Rev., 5.60%, 8/1/09 (MBIA)               2,118
                    1,100  California Public Works Board
                              Lease Rev. COP, Series 1994 A,
                              (Various University of California
                              Projects), 6.15%, 11/1/04,
                              Prerefunded at 102% of Par(1)            1,235
                    1,100  Sacramento Regional
                              Transportation COP, Series
                              1992 A, 6.20%, 3/1/00                    1,124
                                                                   ----------
                                                                       4,477
                                                                   ----------
COLORADO--2.8%
                    2,000  Denver City & County School
                              District No. 1 GO, 5.25%,
                              12/1/16 (FGIC)                           2,025
                    1,000  Denver Sales Tax Rev., Series
                              1991 A, (Major League
                              Baseball Stadium District),
                              6.10%, 10/1/01 (FGIC)                    1,052
                    1,040  Douglas County School District
                              No. 1 GO, 5.25%, 12/15/12
                              (FGIC)                                   1,073
                                                                   ----------
                                                                       4,150
                                                                   ----------
DISTRICT OF COLUMBIA--1.7%
                    1,000  District of Columbia Hospital Rev.,
                              Series 1993 A, (Medlantic
                              Health Care Group), 5.25%,
                              8/15/02 (MBIA)(1)                        1,039

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------

                   $1,275  Metropolitan Washington D.C.
                              Airports Auth. Rev., Series
                              1992 A, 6.30%, 10/1/03
                              (MBIA)                                $  1,381
                                                                   ----------
                                                                       2,420
                                                                   ----------
FLORIDA--4.3%
                      700  Broward County School District
                              GO, 6.75%, 2/15/00                         716
                      245  Escambia County Housing
                              Finance Auth. Single Family
                              Mortgage Rev., Series 1998 A,
                              (Multi-County Program), 4.85%,
                              10/1/07 (GNMA/FNMA)                        247
                      360  Escambia County Housing
                              Finance Auth. Single Family
                              Mortgage Rev., Series 1998 A,
                              (Multi-County Program), 4.90%,
                              4/1/08 (GNMA/FNMA)                         362
                    1,300  Florida State Board Regent
                              University System Improvement
                              Rev., 4.50%, 7/1/23 (AMBAC)              1,163
                    1,775  Lakeland Electric and Water Rev.
                              Refunding, Series 1999 C,
                              6.05%, 10/1/09 (FGIC)                    1,988
                    1,520  Miami-Dade County Public
                              Service Tax Rev., 5.25%,
                              10/1/16 (FSA)                            1,544
                      345  Pinellas County Educational
                              Facilities Auth. Rev., (Barry
                              University), 4.35%, 10/1/00                348
                                                                   ----------
                                                                       6,368
                                                                   ----------
GEORGIA--4.1%
                    1,000  Atlanta Airport Facilities Rev.,
                              7.00%, 1/1/01                            1,047
                    1,000  Atlanta Water and Sewer Rev.,
                              (Second Lien), 6.00%, 1/1/05
                              (FGIC)(1)                                1,089
                    2,495  Fulton County Water and Sewer
                              Rev. Refunding, 6.25%, 1/1/09
                              (FGIC)                                   2,821
                    1,000  Metropolitan Atlanta Rapid Transit
                              Auth. Sales Tax Rev., Series
                              1991 M, 6.05%, 7/1/01                    1,045
                                                                   ----------
                                                                       6,002
                                                                   ----------
HAWAII--0.7%
                    1,000  Hawaii State GO, Series
                              1997 CN, 5.25%, 3/1/13
                              (FGIC)                                   1,019
                                                                   ----------
ILLINOIS--1.6%
                    2,250  Illinois GO, 6.00%, 10/1/01                 2,361
                       30  Metropolitan Pier and Exposition
                              Auth. Rev., (McCormick Place),
                              5.20%, 6/15/99(1)                           30
                                                                   ----------
                                                                       2,391
                                                                   ----------

See Notes to Financial Statements


                                                 www.americancentury.com      15


Intermediate-Term Tax-Free--Sch. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
INDIANA--2.1%
                   $1,000  Center Grove High School
                              Building Corp. Rev., 3.90%,
                              1/5/03 (FSA)                          $    994
                    2,000  Indiana Health Facility Financing
                              Auth. Rev., (Holy Cross Health
                              System Corp.), 5.375%,
                              12/1/12 (MBIA)                           2,050
                                                                   ----------
                                                                       3,044
                                                                   ----------
MASSACHUSETTS--7.7%
                    2,605  Massachusetts Bay Transportation
                              Auth. Rev., Series 1992 C,
                              5.40%, 3/1/00                            2,648
                    1,000  Massachusetts Educational
                              Financing Auth. Education Loan
                              Rev., Series 1998 A, (Issue G),
                              4.55%, 12/1/06 (MBIA)                    1,001
                    1,000  Massachusetts Health &
                              Educational Facilities Auth. Rev.,
                              Series 1998 A, (Harvard Pilgrim
                              Health), 5.25%, 7/1/12 (FSA)             1,017
                    2,500  Massachusetts Water Resource
                              Auth. Rev., Series 1998 B,
                              4.50%, 8/1/22 (FSA)                      2,224
                    3,000  Massachusetts Water Resource
                              Auth. Rev., Series 1998 A,
                              4.75%, 8/1/27 (FSA)                      2,750
                    1,650  Springfield GO, 5.25%, 11/15/14
                              (FSA)                                    1,679
                                                                   ----------
                                                                      11,319
                                                                   ----------
MICHIGAN--2.5%
                    1,000  Detroit City School District,
                              Series 1998 B, 5.375%,
                              5/1/14 (FGIC)                            1,027
                    1,000  Detroit Downtown Development
                              Auth. Tax Increment Rev.,
                              Series 1998 A, (Development
                              Area No. 1), 5.25%, 7/1/12
                              (MBIA)                                   1,016
                    1,500  Detroit Water Supply System Rev.,
                              Series 1995 A, 5.30%, 7/1/09
                              (MBIA)                                   1,583
                                                                   ----------
                                                                       3,626
                                                                   ----------
MISSISSIPPI--2.4%
                    1,000  Harrison County GO, 5.00%,
                              7/1/12 (MBIA)                            1,017
                    2,500  Mississippi Development Special
                              Obligation Rev., (Natural Gas),
                              4.125%, 1/1/06 (MBIA)                    2,456
                                                                   ----------
                                                                       3,473
                                                                   ----------
MISSOURI--0.7%
                    1,000  Missouri Board of Public Buildings
                              State Office Buildings Special
                              Obligation Rev., 6.30%, 12/1/05          1,056
                                                                   ----------


Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------
NEVADA--0.7%
                   $1,000  Clark County Airport Rev., Series
                              1998 A, 5.50%, 7/1/07 (MBIA)          $  1,070
                                                                   ----------
NEW JERSEY--3.7%
                    1,030  Atlantic City Board of Education
                              GO, 6.00%, 12/1/02,
                              Prerefunded at 102% of Par
                              (AMBAC)(1)                               1,121
                    1,410  New Jersey Educational Facility
                              Auth. Rev., Series 1994 A, (New
                              Jersey Institute of Technology),
                              5.90%, 7/1/08 (MBIA)                     1,540
                    1,000  New Jersey Health Care Facilities
                              Financing Auth. Rev., (Atlantic
                              City Medical Center), 6.15%,
                              7/1/99                                   1,003
                    1,800  New Jersey Health Care Facilities
                              Financing Auth. Rev., (Rahway
                              Hospital Obligation Group),
                              5.00%, 7/1/05 (ACA)                      1,839
                                                                   ----------
                                                                       5,503
                                                                   ----------
NEW YORK--13.1%
                    1,950  City University of New York COP,
                              (John Jay College), 5.00%,
                              8/15/09 (AMBAC)                          2,007
                    2,500  Nassau County GO, Series
                              1996 T, 5.20%, 9/1/05 (FGIC)             2,634
                    1,500  New York State Dormitory Auth.
                              Rev., Series 1995 A, (State
                              University Educational Facilities),
                              6.50%, 5/15/04                           1,646
                    1,000  New York State Dormitory Auth.
                              Rev., Series 1995 A, (State
                              University Educational Facilities),
                              6.50%, 5/15/06                           1,117
                    1,000  New York State Dormitory Auth.
                              Rev., Series 1996 E, (Mental
                              Health Service Facility), 6.00%,
                              8/15/04 (AMBAC)                          1,085
                      635  New York State Dormitory Auth.
                              Rev., Series 1998 I, (New York
                              Downtown Hospital), 4.80%,
                              2/15/06                                    643
                    1,175  New York State GO, Series
                              1997 D, 5.25%, 8/1/03                    1,225
                    1,000  New York State GO, Series
                              1997 D, 5.25%, 8/1/06 (FGIC)             1,053
                    1,500  New York State Local Government
                              Assistance Corp. Rev., Series
                              1997 B, 5.25%, 4/1/04 (MBIA)             1,576
                      850  New York State Medical Care
                              Facilities Finance Agency Rev.,
                              (Hospital and Nursing Home),
                              5.95%, 8/15/09 (FHA)                       892
                    1,000  New York State Thruway Auth.
                              Service Contract Rev., 5.30%,
                              4/1/04                                   1,043

                                              See Notes to Financial Statements


16      1-800-345-2021


Intermediate-Term Tax-Free--Sch. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------

                   $1,000  New York State Thruway Auth.
                              Service Contract Rev., 5.50%,
                              4/1/04                                $  1,051
                    1,160  New York State Thruway Auth.
                              Service Contract Rev., 5.50%,
                              4/1/06                                   1,224
                    1,000  New York State Urban
                              Development Corp. Rev., Series
                              1996 A, 6.25%, 4/1/05 (MBIA)             1,102
                    1,000  Niagara Falls Bridge Commission
                              Toll Rev., Series
                              1993 B, 5.25%, 10/1/15 (FGIC)            1,040
                                                                   ----------
                                                                      19,338
                                                                   ----------
NORTH CAROLINA--1.5%
                    2,000  North Carolina Eastern Municipal
                              Power Agency System Rev.,
                              Series 1993 B, 6.00%, 1/1/06
                              (FSA)                                    2,181
                                                                   ----------
OHIO--4.1%
                    1,200  Ohio Higher Educational Facility
                              Commission Rev., (University of
                              Dayton), 5.55%, 12/1/07
                              (FGIC)                                   1,284
                    3,320  Ohio Water Development Auth.
                              Pollution Control Facilities Rev.,
                              6.00%, 12/1/05 (MBIA)                    3,656
                    1,000  Ohio Water Development Auth.
                              Pollution Control Facilities Rev.,
                              5.625%, 12/1/06 (MBIA)                   1,076
                                                                   ----------
                                                                       6,016
                                                                   ----------
OKLAHOMA--1.9%
                    2,500  Oklahoma Industrial Auth. Health
                              System Rev., Series 1995 C,
                              7.00%, 8/15/04 (AMBAC)                   2,810
                                                                   ----------
OREGON--1.4%
                    1,805  Lane County School District
                              No. 19 GO, (Springfield),
                              6.375%, 10/15/04,
                              Prerefunded at 101% of Par
                              (MBIA)(1)                                2,020
                                                                   ----------
PENNSYLVANIA--5.6%
                    1,500  Pennsylvania Turnpike Commission
                              Rev., Series 1991 L, 6.25%,
                              6/1/01 (AMBAC)                           1,572
                    2,000  Philadelphia Gas Works Rev.,
                              14th Series, 5.70%, 7/1/00
                              (FSA)                                    2,049
                    1,000  Philadelphia Parking Auth. Rev.,
                              5.50%, 9/1/04 (AMBAC)                    1,060
                    1,500  Philadelphia School District GO,
                              Series 1998 A, 5.25%, 4/1/14
                              (MBIA)                                   1,522

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------

                   $2,000  Philadelphia Water and Wastewater
                              Rev., 5.15%, 6/15/04 (FGIC)           $  2,095
                                                                   ----------
                                                                       8,298
                                                                   ----------
TEXAS--13.1%
                    1,000  Austin Rev., (Sub-Lien), 5.25%,
                              5/15/12 (MBIA)                           1,042
                    1,000  Austin Utility System Rev., 5.125%,
                              11/15/16 (FSA)                             993
                    1,875  Brownsville Utility System Rev.,
                              6.00%, 9/1/08 (AMBAC)                    2,075
                    1,000  Dallas-Fort Worth Regional Airport
                              Rev., Series 1994 A, 5.90%,
                              11/1/08 (MBIA)                           1,077
                    1,000  Denison Hospital Auth. Rev.,
                              (Texoma Medical Center),
                              5.90%, 8/15/07 (ACA)                     1,066
                    1,740  Harris County Health Facilities
                              Development Corp. Rev., Series
                              1999 A, (Baylor College
                              Medical), 5.375%, 11/15/15
                              (AMBAC)                                  1,771
                    1,000  North East Independent School
                              District Texas GO, 4.50%,
                              2/1/16 (Guaranteed:
                              Permanent School Fund)                     928
                      500  North Texas Higher Education
                              Student Loan Rev., 6.875%,
                              4/1/02 (AMBAC)                             520
                    1,345  San Antonio GO, Series 1998 A,
                              5.125%, 2/1/14                           1,356
                    1,325  Spring Independent School District
                              GO, Series 1998 A, 4.60%,
                              8/15/13 (Guaranteed:
                              Permanent School Fund)                   1,292
                    1,000  Tarrant County Health Facility
                              Development Corporation
                              Health System Rev., (Harris
                              Methodist Health System),
                              5.00%, 9/1/07 (AMBAC)(1)                 1,040
                    2,000  Texas Municipal Power Agency
                              Rev., 5.75%, 9/1/02 (MBIA)               2,113
                    1,000  Texas Municipal Power Agency
                              Rev., 5.25%, 9/1/09 (MBIA)               1,053
                    1,500  Texas Public Finance Auth.
                              Building Rev., (Technical
                              College), 6.25%, 8/1/09 (MBIA)           1,686
                    1,240  Upper Trinity Regional Water
                              District Rev., (Treated Water
                              Supply System), 5.25%, 8/1/12
                              (MBIA)                                   1,263
                                                                   ----------
                                                                      19,275
                                                                   ----------
UTAH--2.8%
                    1,000  Intermountain Power Agency
                              Power Supply Rev., Series
                              1993 A, 5.40%, 7/1/08 (MBIA)             1,047

See Notes to Financial Statements


                                                 www.americancentury.com      17


Intermediate-Term Tax-Free--Sch. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------

                   $1,000  Salt Lake County Municipal
                              Building Auth. Lease Rev.,
                              Series 1994 A, 6.00%,
                              10/1/07 (MBIA)                        $  1,086
                      860  Utah Housing Finance Agency
                              Single Family Mortgage Rev.,
                              5.65%, 7/1/06                              903
                    1,000  Utah Municipal Finance Co-op
                              Local Government Rev.,
                              (University of Utah/University
                              Hospital), 6.60%, 5/15/00(1)             1,031
                                                                   ----------
                                                                       4,067
                                                                   ----------
WASHINGTON--11.9%
                    1,005  King County Library System
                              Facilities Foundation Lease Rev.,
                              (Library System Service Center),
                              4.45%, 12/1/08 (AMBAC)                     998
                    1,000  Pierce County School District
                              No. 320 GO, 5.75%, 12/1/02               1,055
                    1,000  Port Seattle Passenger Facility
                              Charge Rev., Series 1998 B,
                              5.00%, 12/1/05 (AMBAC)                   1,034
                    1,000  Port Seattle Rev., Series 1997 B,
                              5.10%, 10/1/03 (FGIC)                    1,037
                    1,385  Port Tacoma Rev., 4.70%,
                              12/1/04 (AMBAC)                          1,414
                    2,000  Snohomish County Public Utility
                              District Rev., 5.625%, 1/1/05
                              (FGIC)                                   2,123
                    1,000  Snohomish County School District
                              No. 15 GO, 6.125%, 12/1/03               1,053
                    1,000  Spokane County School District
                              No. 356 GO, 6.00%, 12/1/06
                              (FGIC)                                   1,104
                    1,730  Tacoma Electric System Rev.,
                              6.00%, 1/1/07 (AMBAC)                    1,900
                    1,000  Tacoma Electric System Rev.,
                              6.10%, 1/1/07 (FGIC)                     1,091
                    1,000  Washington Health Care Facilities
                              Auth. Rev., (Harrison Memorial
                              Hospital), 5.25%, 8/15/14
                              (AMBAC)                                  1,012
                    1,000  Washington Public Power Supply
                              System Rev., Series 1990 B,
                              (Nuclear Project No. 1), 7.10%,
                              7/1/01 (FGIC)                            1,054

Principal Amount           ($ in Thousands)                          Value
- --------------------------------------------------------------------------------

                   $1,000  Washington Public Power Supply
                              System Rev., Series 1990 C,
                              (Nuclear Project No. 2), 7.30%,
                              7/1/00                                $  1,040
                      500  Washington Public Power Supply
                              System Rev., Series 1990 C,
                              (Nuclear Project No. 2), 7.00%,
                              7/1/01 (FGIC)                              531
                    1,000  Washington Public Power Supply
                              System Rev., Series 1993 A,
                              (Nuclear Project No. 1), 5.50%,
                              7/1/04                                   1,056
                                                                   ----------
                                                                      17,502
                                                                   ----------
WEST VIRGINIA--0.8%
                    1,090  West Virginia GO, Series 1996 D,
                              5.00%, 11/1/10 (FGIC)                    1,113
                                                                   ----------
WISCONSIN--2.7%
                    2,590  Wisconsin Health and Educational
                              Facility Rev., (Aurora Medical
                              Group), 6.00%, 11/15/10 (FSA)            2,894
                    1,060  Wisconsin Health and Educational
                              Facility Rev., Series 1991 B,
                              (Wausau Hospital), 6.30%,
                              8/15/00 (AMBAC)                          1,095
                                                                   ----------
                                                                       3,989
                                                                   ----------
TOTAL MUNICIPAL SECURITIES                                           146,869
                                                                   ----------
   (Cost $142,864)

TEMPORARY CASH INVESTMENTS--0.2%
                      233  Units of Participation in Chase
                              Vista Tax-Free Money Market
                              Fund (Institutional Shares)                233
                                                                   ----------
   (Cost $233)

TOTAL INVESTMENT SECURITIES--100.0%                                 $147,102
                                                                   ==========
   (Cost $143,097)

                                              See Notes to Financial Statements


18      1-800-345-2021


Intermediate-Term Tax-Free--Sch. of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

NOTES TO SCHEDULE OF INVESTMENTS

ACA = American Capital Access

AMBAC = AMBAC Assurance Corporation

COP = Certificates of Participation

FGIC = Financial Guaranty Insurance Co.

FHA = Federal Housing Authority

FHLMC = Federal Home Loan Mortgage Corporation

FNMA = Federal National Mortgage Association

FSA = Financial Security Assurance Inc.

GNMA = Government National Mortgage Association

GO = General Obligation

MBIA = MBIA Insurance Corp.

(1)  Escrowed to maturity in U.S. government securities or state and local
     government securities.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* principal amount of each investment

* the market value of each investment

* the percentage of investments in each state

* the percent and dollar breakdown of each investment category

See Notes to Financial Statements


                                                 www.americancentury.com      19


Long-Term Tax-Free --Performance
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
TOTAL RETURNS AS OF MAY 31, 1999

                      LONG-TERM     LEHMAN LONG-TERM     GENERAL MUNICIPAL DEBT FUNDS(2)
                       TAX-FREE   MUNICIPAL BOND INDEX   AVERAGE RETURN   FUND'S RANKING
======================================================================================
<S>                   <C>             <C>              <C>                 <C>
6 MONTHS(1)            -0.61%            0.24%               0.10%              --
1 YEAR                  3.44%            4.35%               3.26%        122 OUT OF 260
======================================================================================
AVERAGE ANNUAL RETURNS
3 YEARS                 7.15%            8.63%               6.68%         50 OUT OF 202
5 YEARS                 6.79%            8.25%               6.42%         49 OUT OF 153
10 YEARS                7.14%            8.49%               7.17%         39 OUT OF 76
</TABLE>

The fund's inception date was 3/2/87.

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

(2) According to Lipper Inc., an independent mutual fund ranking service.

See pages 45-46 for more information about returns,  the comparative  index, and
Lipper fund rankings.

[mountain graph - data below]

GROWTH OF $10,000 OVER 10 YEARS
Value on 5/31/99
Long-Term Tax-Free    $19,927
Lehman Long-Term
   Muni Bond Index    $22,597

                    Long-Term          Lehman Long-Term
                     Tax-Free           Muni Bond Index
DATE                   VALUE                 VALUE
5/31/89               $10,000               $10,000
5/31/90               $10,505               $10,714
5/31/91               $11,504               $11,861
5/31/92               $12,685               $13,171
5/31/93               $14,030               $15,066
5/31/94               $14,350               $15,200
5/31/95               $15,561               $16,883
5/31/96               $16,199               $17,628
5/31/97               $17,583               $19,392
5/31/98               $19,267               $21,655
5/31/99               $19,927               $22,597

$10,000 investment made 5/31/89

The graph at left shows the growth of a $10,000  investment over 10 years, while
the graph below shows the fund's year-by-year performance.  The Lehman Long-Term
Municipal  Bond  Index is  provided  for  comparison  in each  graph.  Long-Term
Tax-Free's total returns include  operating  expenses (such as transaction costs
and management  fees) that reduce returns,  while the total returns of the index
do not. 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.

{bar graph - data below]

ONE-YEAR RETURNS OVER 10 YEARS (PERIODS ENDING MAY 31)

                   Long-Term         Lehman Long-Term
                    Tax-Free          Muni Bond Index
DATE                 RETURN               RETURN
5/31/90               5.05%                7.14%
5/31/91               9.51%               10.71%
5/31/92              10.27%               11.04%
5/31/93              10.60%               14.39%
5/31/94               2.28%                0.89%
5/31/95               8.44%               11.07%
5/31/96               4.10%                4.41%
5/31/97               8.54%               10.01%
5/31/98               9.58%               11.67%
5/31/99               3.44%                4.35%


20      1-800-345-2021


Long-Term Tax-Free--Q&A
- --------------------------------------------------------------------------------
/photo of Dave MacEwen/

     An  interview  with Dave  MacEwen,  a  portfolio  manager on the  Long-Term
Tax-Free fund investment team.

HOW DID THE FUND PERFORM DURING ITS FISCAL YEAR ENDED MAY 31, 1999?

     Long-Term Tax-Free posted a total return of 3.44%, which outpaced the 3.26%
average total return of the 260 "General Municipal Debt Funds" tracked by Lipper
Inc.

     The fund also  produced  more income than its peers.  The fund's 30-day SEC
yield as of May 31 was  4.37%,  compared  with the  3.97%  yield of the  average
municipal  bond fund,  according  to Lipper.  That 4.37% yield  translates  to a
tax-equivalent yield of approximately 7.24% for investors in the highest (39.6%)
federal tax bracket.

WHAT WAS YOUR INVESTMENT APPROACH?

     From June 1998 through March 1999, we kept Long-Term Tax-Free's duration --
a measure of its interest rate  sensitivity  -- at about 9.3 years, a bit longer
than the average general municipal debt fund. (The longer a fund's duration, the
more its share price will rise or fall in response  to interest  rate  changes.)
That  positioning  was based on our view that  interest  rates would  decline in
response to global economic weakness.  A neutral position for us would have been
about 8.2 years.

     The fund's long  duration  was a direct  result of our emphasis on discount
bonds.  These bonds trade below face value (par) -- at a  "discount"  -- because
their interest coupons are lower than prevailing market interest rates. Discount
bonds are attractive in falling interest rate environments  because they provide
good protection against inopportune refinancings or "calls."

     Like  homeowners,  municipal  bond issuers often "call" bonds when they can
refinance  at  lower  interest  rates.  In  the  same  way  that  home  mortgage
refinancing shortens the life of a mortgage, a call feature effectively shortens
a municipal  bond's  duration.  But because  discount  bonds have interest rates
below prevailing  rates,  there is less incentive for issuers to refinance them,
so they have some call protection.  Since they are less likely to be called, the
durations of discount bonds remain long.

HOW DID ITS LONG DURATION AFFECT THE FUND'S PERFORMANCE?

     The  increased  interest  rate  sensitivity  was  a  plus  for  the  fund's
performance  during periods when rates declined,  as they did last autumn and in
January of this year. On the other hand, the fund's long duration detracted from
performance when rates were on the upswing,  as they were from about February of
this year through the end of May.

DID YOU ALTER YOUR APPROACH IN RESPONSE TO STRONGER-THAN-EXPECTED ECONOMIC
GROWTH?

     Yes, we reduced our stake in discount  bonds. By doing so, we shortened the
fund's  duration  to 8.6  years  by the  end of  May.  Although  we  make  small
adjustments to duration based on our interest rate expectations, we generally

[right margin]

YIELDS AS OF MAY 31, 1999
   30-DAY SEC YIELD                 4.37%
   30-DAY TAX-EQUIVALENT YIELDS
      28.0% TAX BRACKET             6.07%
      31.0% TAX BRACKET             6.33%
      36.0% TAX BRACKET             6.83%
      39.6% TAX BRACKET             7.24%

PORTFOLIO AT A GLANCE
                             5/31/99            5/31/98
NUMBER OF SECURITIES           76                71
WEIGHTED AVERAGE
MATURITY                    17.7 YRS          18.2 YRS
AVERAGE DURATION             8.6 YRS           9.0 YRS
EXPENSE RATIO                 0.51%            0.51%*

* Annualized.

PORTFOLIO COMPOSITION BY
CREDIT RATING
                % OF FUND INVESTMENTS
               AS OF             AS OF
              5/31/99          11/30/98
AAA             69%               64%
AA              23%               28%
A                7%                7%
BBB              1%                1%

Ratings provided by Standard & Poor's.  See Credit Rating  Definitions on page 5
for more information.

Investment terms are defined in the Glossary on pages 46-47.


                                                 www.americancentury.com      21


Long-Term Tax-Free--Q&A
- --------------------------------------------------------------------------------
                                                                  (Continued)

keep the fund's duration  within a year of the duration of Long-Term  Tax-Free's
benchmark.

WHY DID YOU INCREASE THE FUND'S HOLDINGS OF AAA BONDS?

     For  the  most  part,   lower-quality  bonds  didn't  really  offer  enough
additional  yield over AAA  securities to compensate for their added credit risk
(the  risk  that an  issuer  will fail to make  timely  interest  and  principal
payments).

WHAT'S YOUR OUTLOOK FOR INTEREST RATES?

     We believe that  interest  rates may be close to topping  out.  Bond yields
during the second quarter of 1999 reflected fears that the Federal Reserve would
raise interest rates two, perhaps three times over the next nine months or so.
We think those fears are overstated.

     While it's true that first quarter economic growth was a surprising 4.3% on
an annualized basis, a lot of the credit goes to robust consumer spending, which
accounts for roughly  two-thirds of the nation's  economic growth.  The spending
surge was spurred by a number of  factors,  including  federal tax refunds  that
were up 24% over 1998. In addition,  extra money from home loan refinancings and
the wealth created by stock market gains put consumers in a spending mood.

     In our view,  however,  a lot of the momentum behind consumer spending will
prove to be  short-lived.  Most of the tax refunds  have  already  been spent or
saved and higher interest rates will likely curtail home loan refinancings. From
here on out, we believe that  spending and economic  trends will look more tepid
relative to the first quarter of 1999.  Lacking  robust  consumer  spending,  we
think the economy will slow a bit and take the edge off any brewing inflationary
pressures and higher interest rates.

WHAT DOES THAT OUTLOOK MEAN FOR THE MUNICIPAL MARKET?

     Continued low inflation and declining  interest rates would  certainly help
boost the  municipal  market.  But  supply and demand  will also  influence  the
performance of municipal bonds. Municipals  underperformed Treasurys during much
of 1998,  mainly  because of the surge in demand for  Treasuries  from  overseas
investors.  Municipals,  meanwhile,  languished from too much supply.  So far in
1999,  however,  the supply of municipals has tapered off and demand has firmed,
which we believe could set the stage for lower municipal yields.

WITH THIS OUTLOOK IN MIND, WHAT ARE YOUR PLANS FOR LONG-TERM TAX-FREE?

     We will  probably  keep the  portfolio's  duration  a bit  longer  than the
average  municipal  fund as long as we  believe  long-term  interest  rates will
remain  stable or move  lower.  That  should be  positive  for fund  returns  if
municipal bond yields decline, as we expect they will.

[left margin]

"THE SUPPLY OF MUNICIPALS HAS TAPERED OFF AND DEMAND HAS FIRMED, WHICH WE
BELIEVE COULD SET THE STAGE FOR LOWER MUNICIPAL YIELDS."

TOP FIVE STATES (AS OF 5/31/99)
                   % OF FUND INVESTMENTS
TEXAS                     16.4%
NEW YORK                  13.9%
MASSACHUSETTS             11.7%
ILLINOIS                  10.3%
FLORIDA                    7.8%

TOP FIVE STATES (AS OF 11/30/98)
                   % OF FUND INVESTMENTS
TEXAS                     14.5%
WASHINGTON                 9.7%
ILLINOIS                   9.4%
FLORIDA                    8.1%
NEW YORK                   8.1%


22      1-800-345-2021


Long-Term Tax-Free--Schedule of Investments
- --------------------------------------------------------------------------------

MAY 31, 1999

Principal Amount           ($ in Thousands)                            Value
- --------------------------------------------------------------------------------
MUNICIPAL SECURITIES--100.0%
CALIFORNIA--6.4%
                   $1,000  California Public Works Lease Rev.,
                              Series 1994 A, (University
                              Project), 6.20%, 10/1/08              $  1,098
                    1,500  Los Angeles Community
                              Redevelopment Agency Tax
                              Allocation, Series 1993 H,
                              (Bunker Hill), 6.50%, 12/1/14
                              (FSA)                                    1,671
                    1,500  Metropolitan Water District of
                              Southern California Waterworks
                              Rev., Series 1993 A, 5.75%,
                              7/1/21                                   1,631
                    1,850  Northern California Power Agency
                              Rev., Series 1992 A,
                              (Hydroelectric Project #1),
                              6.25%, 7/1/12 (MBIA)                     2,003
                    1,000  San Jose Redevelopment Agency
                              Tax Allocation, Series 1993 D,
                              (Merged Area Redevelopment),
                              5.75%, 8/1/24                            1,044
                                                                   ----------
                                                                       7,447
                                                                   ----------
CONNECTICUT--2.7%
                    1,880  Connecticut Development Auth.
                              Rev., Series 1994 A, 6.375%,
                              10/15/24                                 2,072
                    1,000  Connecticut GO, Series 1993 E,
                              6.00%, 3/15/12                           1,119
                                                                   ----------
                                                                       3,191
                                                                   ----------
DISTRICT OF COLUMBIA--3.6%
                    1,000  District of Columbia Metropolitan
                              Area Transportation Auth. Rev.,
                              6.00%, 7/1/10 (FGIC)                     1,112
                    3,000  District of Columbia Water and
                              Sewer Auth. Public Utility Rev.,
                              5.50%, 10/1/23 (FSA)                     3,121
                                                                   ----------
                                                                       4,233
                                                                   ----------
FLORIDA--7.8%
                      780  Broward County Resource
                              Recovery Facility Rev., (South),
                              7.95%, 12/1/08                             818
                    1,000  Florida State Board of Education
                              Capital Outlay GO, Series
                              1998 D, 4.50%, 6/1/24                      889
                    2,585  Florida State Board Regent
                              University System Improvement
                              Rev., 4.50%, 7/1/23 (AMBAC)              2,313
                    1,270  Miami-Dade County Public Service
                              Tax Rev., 5.25%, 10/1/17 (FSA)           1,284
                    1,000  Orlando Utility Commission
                              Water and Electric
                              Rev., Series 1989 D, 6.75%, 10/1/17      1,196

Principal Amount           ($ in Thousands)                            Value
- --------------------------------------------------------------------------------

                   $1,000  St. Petersburg Health Auth. Rev.,
                              (Allegany Health), 7.00%,
                              12/1/01, Prerefunded at 102%
                              of Par (MBIA)(1)                      $  1,094
                    1,350  Tampa Sports Auth. Sales Tax Rev.,
                              (Tampa Bay Arena), 5.75%,
                              10/1/25 (MBIA)                           1,469
                                                                   ----------
                                                                       9,063
                                                                   ----------
GEORGIA--1.0%
                      745  Georgia Municipal Electric Power
                              Auth. Rev., Series 1991 V,
                              6.50%, 1/1/12 (MBIA)                       860
                      255  Georgia Municipal Electric Power
                              Auth. Rev., Series 1991 V,
                              6.50%, 1/1/12 (MBIA)(1)                    297
                                                                   ----------
                                                                       1,157
                                                                   ----------
ILLINOIS--10.3%
                    1,000  Chicago Gas Supply Rev., Series
                              1985 B, (Peoples Gas), 7.50%,
                              3/1/15                                   1,045
                    1,000  Cook County GO, 7.00%,
                              11/1/00, Prerefunded at 102%
                              of Par (MBIA)(1)                         1,069
                    2,000  Illinois Dedicated Tax Rev., (Civic
                              Center), 6.25%, 12/15/20
                              (AMBAC)                                  2,269
                    1,500  Illinois Development Finance Auth.
                              Pollution Control Rev., Series
                              1990 A, (Central Illinois Public
                              Service), 7.60%, 3/1/14                  1,565
                    1,000  Illinois Development Finance Auth.
                              Waste Disposal Rev., (Armstrong
                              World Industries), 5.95%,
                              12/1/24                                  1,078
                    1,500  Illinois GO, 6.25%, 10/1/06                 1,625
                    1,140  Illinois Health Facilities Auth. Rev.,
                              Series 1992 C, (Evangelical
                              Hospital), 6.75%, 4/15/12(1)             1,323
                      700  Illinois Health Facilities Auth. Rev.,
                              Series 1992 C, (Evangelical
                              Hospital), 6.75%, 4/15/02,
                              Prerefunded at 102% of Par(1)              766
                    1,000  Illinois Regional Transportation
                              Auth. Rev., Series 1990 A,
                              7.20%, 11/1/20 (AMBAC)                   1,256
                                                                   ----------
                                                                      11,996
                                                                   ----------
INDIANA--1.9%
                    1,000  Indiana Municipal Power Agency
                              Rev.,  Series 1990
                              A, 7.10%, 1/1/00, Prerefunded at 102%
                              of Par (AMBAC)(1)                        1,042
                    1,000  Indiana Transportation Financing
                              Auth. Highway Rev., Series
                              1990 A, 7.25%, 6/1/15                    1,233
                                                                   ----------
                                                                       2,275
                                                                   ----------

See Notes to Financial Statements


                                                 www.americancentury.com      23


Long-Term Tax-Free--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

Principal Amount           ($ in Thousands)                            Value
- --------------------------------------------------------------------------------
KANSAS--1.0%
                  $   325  Kansas City Utility System Rev.,
                              6.375%, 9/1/04, Prerefunded
                              at 102% of Par (FGIC)(1)              $    365
                      675  Kansas City Utility System Rev.,
                              6.375%, 9/1/23 (FGIC)                      746
                                                                   ----------
                                                                       1,111
                                                                   ----------
KENTUCKY--1.0%
                    1,000  Carroll County Pollution Control
                              Rev., Series 1992 A, (Kentucky
                              Utilities Company), 7.45%,
                              9/15/16                                  1,112
                                                                   ----------
MASSACHUSETTS--11.7%
                    1,000  Massachusetts Health and
                              Education Auth. Rev., Series
                              1992 F, 6.25%, 7/1/12
                              (AMBAC)                                  1,142
                    1,690  Massachusetts Housing Finance
                              Agency Rev., Series 1993 H,
                              6.75%, 11/15/12 (FNMA)                   1,811
                    2,000  Massachusetts Water Pollution
                              Abatement Rev., Series 1998 A,
                              (New Bedford), 4.75%, 2/1/26
                              (FGIC)                                   1,837
                    2,800  Massachusetts Water Resource
                              Auth. Rev., Series 1993 C,
                              4.75%, 12/1/23 (MBIA)                    2,579
                    7,000  Massachusetts Water Resource
                              Auth. Rev., Series 1998 B,
                              4.50%, 8/1/22 (FSA)                      6,227
                                                                   ----------
                                                                      13,596
                                                                   ----------
MICHIGAN--2.6%
                    2,000  Detroit City School District GO,
                              Series 1998 C, 5.25%, 5/1/25
                              (FGIC)                                   2,021
                    1,020  Paw Paw Public School District
                              GO, 5.00%, 5/1/25 (FGIC)                   993
                                                                   ----------
                                                                       3,014
                                                                   ----------
NEW JERSEY--0.8%
                    1,000  South Jersey Transportation
                              System Auth. Rev., 5.00%,
                              11/1/29 (AMBAC)                            975
                                                                   ----------
NEW YORK--13.9%
                    2,000  Long Island Power Auth. Electric
                              System Rev., Series 1998 A,
                              5.125%, 12/1/22 (FSA)                    1,962
                    2,000  Long Island Power Auth. Electric
                              System Rev., Series 1998 A,
                              5.75%, 12/1/24                           2,079
                    2,000  New York City Transitional Finance
                              Auth. Rev., Series 1998 B,
                              4.50%, 11/15/27                          1,762
                    3,000 New York GO, Series 1998 F,
                              5.375%, 8/1/19 (MBIA)                    3,041

Principal Amount           ($ in Thousands)                            Value
- --------------------------------------------------------------------------------

                   $3,000  New York State Dormitory Auth.
                              Rev., (City University System),
                              5.50%, 7/1/16 (AMBAC)                 $  3,101
                    1,000  New York State Environmental
                              Facilities Corp. Pollution Control
                              Rev., Series 1991 E, 6.30%,
                              6/15/01, Prerefunded at 102%
                              of Par(1)                                1,070
                    1,000  New York State Local Government
                              Assistance Corp. Rev., Series
                              1991 D, 6.75%, 4/1/02,
                              Prerefunded at 102% of Par(1)            1,097
                    2,000  St. Lawrence County Industrial
                              Development Civic Facility Rev.,
                              Series 1998 A, (St. Lawrence
                              University), 5.375%, 7/1/18
                              (MBIA)                                   2,027
                                                                   ----------
                                                                      16,139
                                                                   ----------
NORTH CAROLINA--0.9%
                    1,000  North Carolina Municipal Power
                              Agency #1 Rev., (Catawba
                              Electric), 6.00%, 1/1/10 (MBIA)          1,105
                                                                   ----------
OHIO--0.8%
                      750  Ohio Higher Educational Facility
                              Rev., Series 1990 B, (Case
                              Western Reserve University),
                              6.50%, 10/1/20                             881
                                                                   ----------
PUERTO RICO--2.1%
                    2,050  Puerto Rico Commonwealth GO,
                              4.50%, 7/1/23                            1,830
                      500  Puerto Rico Commonwealth GO,
                              6.45%, 7/1/04, Prerefunded at
                              101.5% of Par(1)                           562
                                                                   ----------
                                                                       2,392
                                                                   ----------
RHODE ISLAND--4.3%
                    1,100  Rhode Island Clean Water Safe
                              Drinking Rev., 6.70%, 1/1/15
                              (AMBAC)                                  1,236
                    2,000  Rhode Island Depositors
                              Economic Protection Corp.
                              Special Obligation Rev., Series
                              1993 A, 6.25%, 8/1/16
                              (MBIA)(1)                                2,282
                    1,300  Rhode Island Depositors
                              Economic Protection Corp.
                              Special Obligation Rev., Series
                              1993 B, 6.00%, 8/1/17
                              (MBIA)(1)                                1,427
                                                                   ----------
                                                                       4,945
                                                                   ----------
SOUTH CAROLINA--2.5%
                      860  Piedmont Municipal Power Agency
                              Electric Rev., Series 1991 A,
                              6.50%, 1/1/16 (FGIC)                     1,002

                                              See Notes to Financial Statements


24      1-800-345-2021


Long-Term Tax-Free--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

Principal Amount           ($ in Thousands)                            Value
- --------------------------------------------------------------------------------

                  $   140  Piedmont Municipal Power
                              Agency Electric Rev., Series
                              1991 A, 6.50%, 1/1/16
                              (FGIC)(1)                             $    164
                    1,500  Piedmont Municipal Power
                              Agency Electric Rev., 6.75%,
                              1/1/19 (FGIC)                            1,793
                                                                   ----------
                                                                       2,959
                                                                   ----------
TEXAS--16.4%
                    1,000  Alliance Airport Auth. Special
                              Facilities Rev., (American
                              Airlines), 7.00%, 12/1/11
                              (GTEED)                                  1,168
                    1,000  Denton Utility System Rev., Series
                              1996 A, 5.95%, 12/1/14
                              (MBIA)                                   1,084
                    1,000  Frisco Independent School District
                              GO, Series 1998 A, 4.50%,
                              8/15/29 (Guaranteed:
                              Permanent School Fund)                     881
                    5,000  Houston Independent School
                              District GO, 5.375%, 8/15/17
                              (Guaranteed: Permanent School
                              Fund)                                    5,072
                    1,400  Lubbock Health Facilities
                              Development Corp. Rev., (St.
                              Joseph Health System), 5.25%,
                              7/1/13                                   1,415
                    2,000  San Antonio Electric and Gas
                              System Rev., 7.10%, 2/1/09
                              (FGIC)(2)                                1,265
                    1,000  Tarrant County Health Facility Rev.,
                              6.00%, 5/15/11 (MBIA)                    1,101
                    2,500  Texas Municipal Power Agency
                              Rev., Series 1991 A, 6.75%,
                              9/1/12 (AMBAC)                           2,694
                    2,000  Texas Southern University Rev.,
                              Series 1998 B, 4.50%,
                              11/1/23 (AMBAC)                          1,776
                    1,765  Travis County GO, 4.50%, 3/1/19             1,604
                    1,000  Weatherford Utility System Rev.,
                              5.25%, 9/1/14 (FSA)                      1,009
                                                                   ----------
                                                                      19,069
                                                                   ----------

Principal Amount           ($ in Thousands)                            Value
- --------------------------------------------------------------------------------

UTAH--1.1%
                   $1,000  Salt Lake City Hospital Rev.,
                              Series 1988 A, (Intermountain
                              Health Corporation), 8.125%,
                              5/15/15(1)                            $  1,276
                                                                   ----------
VIRGINIA--0.9%
                    1,000  Hampton Industrial Development
                              Auth. Rev., Series 1994 A,
                              (Sentara General Hospital),
                              6.50%, 11/1/12                           1,104
                                                                   ----------
WASHINGTON--3.2%
                    1,405  Port of Seattle Rev., 7.50%,
                              12/1/00, Prerefunded at 102%
                              of Par (AMBAC)(1)                        1,514
                    1,000  Washington GO, Series 1990 A,
                              6.75%, 2/1/15                            1,196
                    1,000  Washington Public Power Supply
                              Rev., Series 1996 A, (Nuclear
                              Project #1), 5.75%, 7/1/12
                              (MBIA)                                   1,063
                                                                   ----------
                                                                       3,773
                                                                   ----------
WISCONSIN--3.1%
                    1,180  Winneconne Community School
                              District GO, 6.75%, 4/1/06,
                              Prerefunded at 100% of Par
                              (FGIC)(1)                                1,351
                    1,900  Wisconsin Clean Water Rev.,
                              6.875%, 6/1/11                           2,260
                                                                   ----------
                                                                       3,611
                                                                   ----------
TOTAL INVESTMENT SECURITIES--100.0%                                 $116,424
                                                                   ==========
   (Cost $111,022)

See Notes to Financial Statements


                                                 www.americancentury.com      25


Long-Term Tax-Free--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

NOTES TO SCHEDULE OF INVESTMENTS

AMBAC = AMBAC Assurance Corporation

FGIC = Financial Guaranty Insurance Co.

FNMA = Federal National Mortgage Association

FSA = Financial Security Assurance Inc.

GO = General Obligation

GTEED = CG Life Guaranty Agreement

MBIA = MBIA Insurance Corp.

(1)  Escrowed to maturity in U.S. government securities or state and local
     government securities.

(2)  Security is a zero-coupon municipal bond. The yield to maturity at purchase
     is  indicated.  Zero-coupon  securities  are  purchased  at  a  substantial
     discount from their value at maturity.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* principal amount of each investment

* the market value of each investment

* the percentage of investments in each state

* the percent and dollar breakdown of each investment category

                                              See Notes to Financial Statements


26      1-800-345-2021


High-Yield Municipal--Performance
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
TOTAL RETURNS AS OF MAY 31, 1999

                HIGH-YIELD     LEHMAN LONG-TERM    HIGH CURRENT YIELD MUNICIPAL FUNDS(3)
                MUNICIPAL    MUNICIPAL BOND INDEX     AVERAGE RETURN   FUND'S RANKING
======================================================================================
<S>             <C>           <C>                <C>                  <C>
6 MONTHS(1)(2)    1.90%              0.24%                0.98%             --
1 YEAR(2)         6.18%              4.35%                3.57%         1 OUT OF 53
======================================================================================
AVERAGE ANNUAL
RETURNS
LIFE OF FUND(2)   6.90%              4.97%                4.63%         1 OUT OF 53
</TABLE>

The fund's inception date was 3/31/98.

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

(2) Management fees were waived through  4/30/99.  Returns would have been lower
    if fees had not been waived.

(3) According to Lipper Inc., an independent mutual fund ranking service.

See pages 45-46 for more information about returns,  the comparative  index, and
Lipper fund rankings.

{mountain graph - data below]

GROWTH OF $10,000 OVER LIFE OF FUND
Value on 5/31/99
High-Yield Municipal   $10,809
Lehman Long-Term
   Muni Bond Index     $10,583

                    High-Yield          Lehman Long-Term
                     Municipal          Muni Bond Index
DATE                   VALUE                 VALUE
3/31/98               $10,000               $10,000
4/30/98                $9,994                $9,946
5/31/98               $10,181               $10,141
6/30/98               $10,276               $10,187
7/31/98               $10,300               $10,210
8/31/98               $10,469               $10,393
9/30/98               $10,607               $10,537
10/31/98              $10,563               $10,504
11/30/98              $10,608               $10,557
12/31/98              $10,660               $10,568
1/31/99               $10,760               $10,671
2/28/99               $10,741               $10,626
3/31/99               $10,757               $10,657
4/30/99               $10,826               $10,667
5/31/99               $10,809               $10,583

$10,000 investment made 3/31/98

The graph at left shows the growth of a $10,000  investment over the life of the
fund.  The Lehman  Long-Term  Municipal  Bond Index is provided for  comparison.
High-Yield  Municipal's  total  returns  include  operating  expenses  (such  as
transaction  costs and  management  fees) that reduce  returns,  while the total
returns of the index do not. 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.

PORTFOLIO AT A GLANCE
                             5/31/99           5/31/98
NUMBER OF SECURITIES           39                35
WEIGHTED AVERAGE
   MATURITY                 15.9 YRS          19.4 YRS
AVERAGE DURATION             6.3 YRS           7.3 YRS
EXPENSE RATIO                0.01%*            0.00%*

* Fund expenses of approximately  0.64% were waived from the fund's inception on
  3/31/98 through 4/30/99.

YIELDS AS OF MAY 31, 1999
  30-DAY SEC YIELD                  5.31%
  30-DAY TAX-EQUIVALENT YIELDS
      28.0% TAX BRACKET             7.38%
      31.0% TAX BRACKET             7.70%
      36.0% TAX BRACKET             8.30%
      39.6% TAX BRACKET             8.79%


                                                 www.americancentury.com      27


High-Yield Municipal--Q&A
- --------------------------------------------------------------------------------
/photo of Steven Permut/

     An interview  with Steven  Permut,  a portfolio  manager on the  High-Yield
Municipal fund investment team.

HOW DID HIGH-YIELD MUNICIPAL PERFORM DURING THE 12 MONTHS ENDED MAY 31, 1999?

     The  fund  significantly  outpaced  its  peers.  For the  12-month  period,
High-Yield  Municipal  returned  6.18%,  while  the  average  return  of  the 53
"High-Yield  Municipal  Funds" tracked by Lipper Inc. was 3.57%.  Based on those
returns, High-Yield Municipal ranked number one of the 53 funds for the one-year
period.  (See the  Total  Returns  table  on the  previous  page for  additional
performance comparisons.)

HOW DOES THE PORTFOLIO'S YIELD COMPARE WITH THE PEER GROUP?

     High-Yield  Municipal also produced more federal  tax-free  income than the
peer group average. As of May 31, the portfolio had a 30-day SEC yield of 5.31%.
By comparison, the average municipal high-yield fund yielded 4.69%, according to
Lipper.  The  fund's  5.31%  yield  translates  to  a  tax-equivalent  yield  of
approximately 8.8% for investors in the highest (39.6%) federal tax bracket.

     A fee waiver that expired on April 30 helped  boost the fund's  returns and
yield.  The waiver  provided a way to  maintain  competitive  yields and returns
early in the fund's existence.  Older funds in High-Yield Municipal's peer group
held bonds  issued and  purchased in higher  interest  rate  environments.  As a
result,  their  yields  were likely to be higher than the yields on the bonds we
purchased in 1998,  the year of the fund's  inception.  But over time, the yield
advantage of older funds should disappear as higher-yielding bonds mature or are
redeemed.

     Even  without  the fee  waiver,  High-Yield  Municipal's  expense  ratio of
approximately  0.64% is well below the average for high-yield  municipal  funds,
which was 1.23% as of May 31, according to Lipper.

WHAT INVESTMENT STRATEGIES HELPED HIGH-YIELD MUNICIPAL OVER THE PAST YEAR?

     Timely adjustments to duration -- a measure of a bond fund's sensitivity to
interest  rate  changes  -- helped  performance.  During  the first  half of the
period,  we generally kept duration  somewhat long at about 8 years.  That meant
High-Yield Municipal's share price was more sensitive to changing interest rates
than many of its peers.

     When interest rates declined through early October,  the fund's sensitivity
to interest  rate  changes  worked in its favor.  By  mid-October,  however,  we
reversed course by shortening duration to about 7.5 years because we feared that
interest rates and bond yields were headed higher. When rates and yields climbed
from November through May, having a shorter duration helped relative returns. We
further shortened duration to 6.3 years by the end of the period.

[left margin]

"HIGH-YIELD MUNICIPAL RANKED NUMBER ONE OF THE 53 FUNDS FOR THE ONE-YEAR
PERIOD."

PORTFOLIO COMPOSITION BY
CREDIT RATING
                  % OF FUND INVESTMENTS
                  AS OF            AS OF
                 5/31/99          11/30/98
AAA               19%               19%
AA                 --                3%
A                  1%                4%
BBB               24%               22%
BB                 1%                6%
UNRATED           55%               46%

Ratings provided by Standard & Poor's.  See Credit Rating  Definitions on page 5
for more information.

Investment terms are defined in the Glossary on pages 46-47.


28      1-800-345-2021


High-Yield Municipal--Q&A
- --------------------------------------------------------------------------------
                                                                    (Continued)

WAS THE FUND EXPOSED TO ANY TROUBLED HEALTH CARE ISSUERS?

     Last year's  bankruptcy of a large  hospital  system in  Pennsylvania,  the
recent  reduction  in  Medicare  and  Medicaid  reimbursements,  and  one  large
municipal bond insurer's refusal to continue insuring  lower-quality health care
bonds cast a pall over the entire health care sector.

     Fortunately,  the fund had no exposure to the worst performing  health care
bonds and had a smaller overall weighting in the sector relative to its peers. A
lot of the credit goes to our municipal analysts, who do extensive financial and
demographic   analyses  and  frequently  conduct  site  visits  to  determine  a
security's  value.  We're also  fortunate  to have a municipal  analyst  who's a
health care industry specialist.

GIVEN THE LONG LIST OF  CHALLENGES  THEY FACE,  HOW DO YOU  IDENTIFY  ATTRACTIVE
HEALTH CARE ENTITIES AND BONDS?

     We're very,  very  selective-- we turn away five potential  investments for
every one we buy. First of all, we're looking for bonds that offer an attractive
amount of yield as compensation for the issuing entity's credit risk.

     We also generally  emphasize  hospitals  that are sole  providers  within a
given  geographic area. A good example is St. John's Hospital and Living Center,
located in Jackson  Hole,  Wyoming,  whose  closest  competitor is more than 100
miles  away.  Other  factors  we look for  include a history  of good  financial
performance and a strong management team.

     Despite  their  recent  disappointing  performance,  we  plan  to  maintain
investments  in  health  care  bonds.   Not  only  are  they  important  from  a
diversification  standpoint, but they also offer attractive yields compared with
most other sectors of the high-yield municipal market.

HOW ARE HIGH-YIELD MUNICIPAL'S INVESTMENTS DIVIDED AMONG VARIOUS STATES?

     The fund has a relatively  large  weighting in Florida,  which continues to
benefit  from low  unemployment  and  strong  tourism  activity.  We also  favor
Arizona, Nevada, and Colorado, where economic trends are favorable.

     On the flip side,  the only states we're  avoiding right now are Alaska and
Hawaii. Alaska is still feeling the lingering effects of low oil prices in 1998,
while Hawaii's credit quality recently declined due to a decrease in spending by
Asian tourists.

WHAT'S YOUR OUTLOOK FOR THE HIGH-YIELD MUNICIPAL MARKET FOR THE NEXT SIX MONTHS

     The direction of interest rates, of course, will be the main determinant of
municipal bond performance. In our view, interest rates may move higher over the
next six months. Wage pressures -- a main component of inflation -- appear to be
building. In response,  the Federal Reserve has raised short-term interest rates
once, and could do it again to thwart inflationary pressures.

     From a credit quality standpoint, we think the national economy will remain
strong. As a result, our outlook calls for high-yield municipals to perform well
relative to the rest of the municipal market.

WITH THAT OUTLOOK IN MIND, WHAT ARE YOUR PLANS FOR HIGH-YIELD MUNICIPAL OVER THE
NEXT SIX MONTHS?

     We'll likely keep High-Yield  Municipal's  duration somewhat short. We also
plan to continue to do what has led to the fund's  strong  performance  over the
past  year  --  use  thorough   bond-by-bond  analysis  to  identify  attractive
opportunities and avoid problem areas.

[right margin]

"THE FUND HAS A RELATIVELY LARGE WEIGHTING IN FLORIDA, WHICH CONTINUES TO
BENEFIT FROM LOW UNEMPLOYMENT AND STRONG TOURISM ACTIVITY."

TOP FIVE STATES (AS OF 5/31/99)
                  % OF FUND INVESTMENTS
FLORIDA                  15.2%
PENNSYLVANIA             14.7%
CALIFORNIA                9.5%
ARIZONA                   7.4%
NEW YORK                  6.0%

TOP FIVE STATES (AS OF 11/30/98)
                 % OF FUND INVESTMENTS
CALIFORNIA              21.6%
FLORIDA                  9.1%
PENNSYLVANIA             8.6%
ALASKA                   6.0%
OREGON                   5.8%


                                                 www.americancentury.com      29


High-Yield Municipal--Schedule of Investments
- --------------------------------------------------------------------------------

MAY 31, 1999

Principal Amount           ($ in Thousands)                           Value
- --------------------------------------------------------------------------------
MUNICIPAL SECURITIES--98.0%
ALASKA--1.5%
                   $  660  Alaska Industrial Development &
                              Export Auth. Power Rev., (Upper
                              Lynn Canal Regional Power),
                              5.80%, 1/1/18                         $   647
                                                                   ---------
ARIZONA--7.4%
                    2,245  Gilbert Industrial Development
                              Nonprofit Auth. Rev., Series
                              1999 A, (Southwest Student
                              Services), 5.25%, 2/1/10                2,194
                    1,000  Phoenix Industrial Development
                              Auth. Single Family
                              Mortgage Rev., Series 1998 A,
                              6.60%, 12/1/29
                              (GNMA/FNMA/FHLMC)                       1,088
                                                                   ---------
                                                                      3,282
                                                                   ---------
CALIFORNIA--9.5%
                    2,230  Sacramento County Improvement
                              Bond Act 1915 Special
                              Assessment, (Sunrise/Cordova
                              Reassessment), 5.20%,
                              9/2/08(1)                               2,251
                    1,000  Stockton Community Facilities
                              District Special Tax Rev., Series
                              1998 A, (Mello Roos-Weston
                              Ranch), 5.80%, 9/1/14                   1,016
                    1,000  Student Education Loan Marketing
                              Corp. Rev., Series 1998 IV-D-1,
                              5.875%, 1/1/18 (Guaranteed:
                              Student Loans)                            953
                                                                   ---------
                                                                      4,220
                                                                   ---------
COLORADO--4.0%
                    1,280  Colorado Health Facilities Auth.
                              Rev., Series 1998 A,
                              (Volunteers), 5.00%, 7/1/03             1,266
                      500  Denver Health & Hospital Rev.,
                              Series 1998 A, 4.75%,
                              12/1/01                                   507
                                                                   ---------
                                                                      1,773
                                                                   ---------
FLORIDA --15.2%
                      865  Arbor Greene Community
                              Development District Special
                              Assessment Rev., 5.75%,
                              5/1/06                                    865
                    1,500  Florida Housing Finance Corp.
                              Rev., Series 1999-2,
                              (Homeowner Mortgage), 4.60%,
                              1/1/21 (FSA)                            1,501
                    1,500  Heritage Isles Community
                              Development District Special
                              Assessment Rev., Series 1998 A,
                              5.75%, 5/1/05(1)                        1,503

Principal Amount           ($ in Thousands)                           Value
- --------------------------------------------------------------------------------

                   $1,000  Heritage Isles Community
                              Development District Special
                              Assessment Rev., Series 1998 B,
                              6.00%, 5/1/20                         $   983
                    1,685  Herons Glen Recreational District
                              Special Assessment Tax
                              Allocation, 5.50%, 5/1/05(2)            1,678
                      210  Manatee County Housing Finance
                              Auth. Mortgage Rev., (Single
                              Family), 7.20%, 5/1/28
                              (GNMA/FNMA/FHLMC)                         237
                                                                   ---------
                                                                      6,767
                                                                   ---------
IDAHO--1.2%
                      495  Idaho Housing Agency Rev.,
                              Series 1995 C-2, (Single Family
                              Mortgage), 6.35%, 7/1/15                  526
                                                                   ---------
ILLINOIS--3.4%
                    1,500  Illinois Health Facilities Auth. Rev.,
                              (Alexian Brothers Health
                              System), 5.25%, 1/1/14 (FSA)            1,506
                                                                   ---------
INDIANA--4.1%
                      750  Indiana Health Facilities Financing
                              Hospital Auth. Rev., (Riverview
                              Hospital), 5.25%, 8/1/14                  732
                    1,020  Indianapolis Airport Auth. Rev.,
                              Series 1995 A, (United Airlines),
                              6.50%, 11/15/31                         1,101
                                                                   ---------
                                                                      1,833
                                                                   ---------
KENTUCKY--0.3%
                      135  Kentucky Housing Corp. Rev.,
                              Series 1988 C, 7.90%, 1/1/21
                              (FHA/VA Mortgages)                        140
                                                                   ---------
MASSACHUSETTS--2.3%
                    1,000  Massachusetts Health &
                              Educational Facilities Auth. Rev.,
                              Series 1999 A, 5.25%, 7/1/07            1,003
                                                                   ---------
MISSISSIPPI--3.2%
                    1,500  Mississippi Business Finance Corp.
                              Health Facilities Rev., (Medical
                              Foundation Inc.), 5.375%,
                              7/1/15                                  1,436
                                                                   ---------
MISSOURI--1.1%
                      465  Hannibal Industrial Development
                              Auth. Educational Facilities Rev.,
                              (Hannibal-Lagrange College),
                              5.90%, 10/1/18                            467
                                                                   ---------
NEW JERSEY--4.6%
                    2,000  New Jersey Economic
                              Development Auth. Rev., Series
                              1998 A, (Kapkowski Road
                              Landfill), 6.375%, 4/1/31               2,058
                                                                   ---------

                                              See Notes to Financial Statements


30      1-800-345-2021


High-Yield Municipal--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

Principal Amount           ($ in Thousands)                           Value
- --------------------------------------------------------------------------------
NEW MEXICO--4.0%
                   $  750  Rio Rancho Water & Wastewater
                              System Rev., 5.25%, 5/15/17
                              (AMBAC)                               $   755
                    1,000  Santa Fe Educational Facilities
                              Rev., (College of Santa Fe),
                              5.875%, 10/1/21                         1,018
                                                                   ---------
                                                                      1,773
                                                                   ---------
NEW YORK--4.0%
                    1,755  New York State Dormitory Auth.
                              Rev., Series 1999 B,
                              (Community Enhancement),
                              4.00%, 4/1/00                           1,765
                                                                   ---------
NORTH CAROLINA--2.2%
                    1,050  North Carolina Medical Care
                              Community Hospital Rev.,
                              (Halifax Regional Medical
                              Center), 5.00%, 8/15/24                   982
                                                                   ---------
OREGON--5.3%
                    1,415  Oregon Health Housing
                              Educational & Cultural Facilities
                              Auth. Rev., 4.50%, 10/1/06              1,387
                    1,000  Oregon Health Housing
                              Educational & Cultural Facilities
                              Auth. Rev., 5.25%, 10/1/16                961
                                                                   ---------
                                                                      2,348
                                                                   ---------
PENNSYLVANIA--14.7%
                    2,500  Dauphin County General Auth.
                              Rev., (Hyatt Regency Hotel &
                              Conference Center), 6.20%,
                              1/1/29                                  2,518
                    1,360  New Morgan Municipal Auth.
                              Office Rev., Series 1999 A,
                              (Commonwealth Office),
                              5.375%, 6/1/08(2)                       1,337
                    1,000  Philadelphia School District GO,
                              Series 1998 A, 5.25%, 4/1/14
                              (MBIA)                                  1,015

Principal Amount           ($ in Thousands)                           Value
- --------------------------------------------------------------------------------

                   $1,695  Susquehanna Area Regional
                              Airport Auth. Rev., (Aero
                              Harrisburg LLC), 5.25%,
                              1/1/09                                $ 1,669
                                                                   ---------
                                                                      6,539
                                                                   ---------
TENNESSEE--0.6%
                      230  Tennessee Housing Development
                              Agency Mortgage Finance Rev.,
                              Series 1995 C, 6.45%, 7/1/21              245
                                                                   ---------
UTAH--4.7%
                    2,105  Bountiful Hospital Rev., (South
                              Davis Community Hospital),
                              5.125%, 12/15/05                        2,107
                                                                   ---------
WASHINGTON--1.1%
                      500  Port Anacortes Rev., Series
                              1998 A, 5.625%, 9/1/16                    499
                                                                   ---------
WYOMING--3.6%
                    1,500  Teton County Hospital District
                              Rev., 5.80%, 12/1/17                    1,496
                       95  Wyoming Community
                              Development Auth. Rev., Series
                              1990 B, (Single Family
                              Mortgage), 8.125%, 6/1/21
                              (FHA)                                      98
                                                                   ---------
                                                                      1,594
                                                                   ---------
TOTAL MUNICIPAL SECURITIES                                           43,510
                                                                   ---------
   (Cost $43,431)

SHORT-TERM MUNICIPAL SECURITIES--2.0%
NEW YORK
                      900  New York GO, Series 1992 B,
                              VRDN, 3.30%, 6/1/99 (FGIC)
                              (SBBPA: General Electric
                              Capital Corp.)                            900
                                                                   ---------
   (Cost $900)

TOTAL INVESTMENT SECURITIES--100.0%                                 $44,410
                                                                   =========
   (Cost $44,331)

See Notes to Financial Statements


                                                 www.americancentury.com      31


High-Yield Municipal--Schedule of Investments
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

NOTES TO SCHEDULE OF INVESTMENTS

AMBAC = AMBAC Assurance Corporation

FGIC = Financial Guaranty Insurance Co.

FHA = Federal Housing Authority

FHLMC = Federal Home Loan Mortgage Corporation

FNMA = Federal National Mortgage Association

FSA = Financial Security Assurance Inc.

GNMA = Government National Mortgage Corporation

GO = General Obligation

MBIA = MBIA Insurance Corp.

SBBPA = Standby Bond Purchase Agreement

VA = Veteran's Administration

VRDN = Variable Rate Demand Note.  Interest  reset date is indicated and used in
calculating the weighted average portfolio maturity. Rate shown is effective May
31, 1999.

(1) Security,  or a portion  thereof,  has been segregated at the custodian bank
    for when-issued securities.

(2) When-issued security.

- --------------------------------------------------------------------------------
UNDERSTANDING  THE  SCHEDULE  OF  INVESTMENTS--This  schedule  tells  you  which
investments your fund owned on the last day of the reporting period.

The schedule includes:

* a list of each investment

* principal amount of each investment

* the market value of each investment

* the percentage of investments in each state

* the percent and dollar breakdown of each investment category

                                              See Notes to Financial Statements


32      1-800-345-2021


<TABLE>
<CAPTION>
Statements of Assets and Liabilities
- --------------------------------------------------------------------------------
                                 LIMITED-TERM INTERMEDIATE-TERM  LONG-TERM   HIGH-YIELD
MAY 31, 1999                       TAX-FREE       TAX-FREE       TAX-FREE     MUNICIPAL

ASSETS                                     (In Thousands Except Per-Share Amounts)
<S>                                 <C>          <C>          <C>            <C>
Investment securities, at value
(identified cost of $41,928,
$143,097, $111,022 and
$44,331, respectively)
(Note 3) .........................  $ 42,448     $147,102     $ 116,424      $44,410
Cash .............................      --            223          --           --
Investment in affiliated money
market fund (Note 2) .............      --              2             6         --
Receivable for investments sold ..      --           --           6,012          483
Interest receivable ..............       641        2,475         2,191          659
                                    --------     --------     ---------      -------
                                      43,089      149,802       124,633       45,552
                                    --------     --------     ---------      -------

LIABILITIES
Disbursements in excess
of demand deposit cash ...........       909         --             819          441
Payable for investments
purchased ........................     1,023         --           6,123        3,019
Dividends payable ................        22           59            56           20
Accrued management
fees (Note 2) ....................        18           64            51            4
Payable for trustees'
fees and expenses ................      --              1          --           --
                                    --------     --------     ---------      -------
                                       1,972          124         7,049        3,484
                                    --------     --------     ---------      -------
Net Assets .......................  $ 41,117     $149,678     $ 117,584      $42,068
                                    ========     ========     =========      =======

CAPITAL SHARES
Outstanding (unlimited
number of shares
authorized) ......................     4,056       14,406        11,222        4,158
                                    ========     ========     =========      =======
Net Asset Value Per Share ........  $  10.14     $  10.39     $   10.48      $ 10.12
                                    ========     ========     =========      =======

NET ASSETS CONSIST OF:
Capital paid-in ..................  $ 40,495     $145,314     $ 112,460      $41,973
Undistributed net investment
income ...........................        18         --            --           --
Accumulated undistributed
(distributions in excess of)
net realized gain on
investment transactions ..........        84          359          (278)          16
Net unrealized appreciation
on investments (Note 3) ..........       520        4,005         5,402           79
                                    --------     --------     ---------      -------

                                    $ 41,117     $149,678     $ 117,584      $42,068
                                    ========     ========     =========      =======
</TABLE>

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF ASSETS AND  LIABILITIES--This  statement details
what the fund owns (assets),  what it owes (liabilities),  and its net assets as
of the last day of the period.  If you subtract  what the fund owes from what it
owns, you get the fund's net assets.  The net assets divided by the total number
of shares  outstanding  gives you the price of an individual  share,  or the net
asset value per share.

NET ASSETS are also broken down by capital (money invested by shareholders); net
investment income not yet paid to shareholders or net investment losses, if any;
net gains earned on investments  but not yet paid to  shareholders or net losses
on investments (known as realized gains or losses); and finally, gains or losses
on  securities  still owned by the fund  (known as  unrealized  appreciation  or
depreciation).  This  breakdown  tells  you the  value  of net  assets  that are
performance-related,  such as investment  gains or losses,  and the value of net
assets that are not related to performance,  such as shareholder investments and
redemptions.

See Notes to Financial Statements


                                                 www.americancentury.com      33


<TABLE>
<CAPTION>
Statements of Operations
- --------------------------------------------------------------------------------

                                        LIMITED-TERM   INTERMEDIATE-TERM      LONG-TERM       HIGH-YIELD
YEAR ENDED MAY 31, 1999                   TAX-FREE         TAX-FREE           TAX-FREE        MUNICIPAL

INVESTMENT INCOME                                                 (In Thousands)
Income:
<S>                                       <C>               <C>               <C>               <C>
Interest ............................     $ 1,791           $ 7,317           $ 6,419           $ 1,959
                                          -------           -------           -------           -------

Expenses (Note 2):
Management fees .....................         204               734               604               235
Trustees' fees and expenses .........           3                 8                 7                 2
                                          -------           -------           -------           -------
Total expenses ......................         207               742               611               237
Amount waived .......................        --                --                --                (233)
                                          -------           -------           -------           -------
Net expenses ........................         207               742               611                 4
                                          -------           -------           -------           -------
Net investment income ...............       1,584             6,575             5,808             1,955
                                          -------           -------           -------           -------

REALIZED AND UNREALIZED
GAIN (LOSS) ON INVESTMENTS
(NOTE 3)
Net realized gain on investments ....         188               765               411               169
Change in net unrealized
appreciation on investments .........        (139)           (1,787)           (2,257)              (83)
                                          -------           -------           -------           -------
Net realized and unrealized
gain (loss) on investments ..........          49            (1,022)           (1,846)               86
                                          -------           -------           -------           -------
Net Increase in Net Assets
Resulting from Operations ...........     $ 1,633           $ 5,553           $ 3,962           $ 2,041
                                          =======           =======           =======           =======
</TABLE>

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF OPERATIONS--This  statement breaks down how each
fund's  net  assets  changed  during  the  period  as a  result  of  the  fund's
operations.  It tells you how much money the fund made or lost after taking into
account income,  fees and expenses,  and investment gains or losses. It does not
include shareholder transactions and distributions.

Fund OPERATIONS include:

* interest income earned from investments

* management fees and other expenses

* gains or losses from selling investments (known as realized gains or losses)

* gains or losses on current fund holdings (known as unrealized appreciation or
  depreciation)

                                              See Notes to Financial Statements


34      1-800-345-2021


<TABLE>
<CAPTION>
Statements of Changes in Net Assets
- --------------------------------------------------------------------------------

YEAR ENDED MAY 31, 1999, PERIOD ENDED MAY 31, 1998(1)
AND YEAR ENDED OCTOBER 31, 1997

                                        LIMITED-TERM TAX-FREE            INTERMEDIATE-TERM TAX-FREE
                                  MAY 31,    MAY 31,    OCT. 31,      MAY 31,      MAY 31,     OCT. 31,
Increase (Decrease) in Net Assets   1999       1998        1997         1999         1998         1997
OPERATIONS                                                 (In Thousands)
<S>                             <C>         <C>         <C>         <C>          <C>          <C>
Net investment income ..........$  1,584    $    878    $  1,796    $   6,575    $   3,630    $   3,978
Net realized gain (loss)
on investments .................     188          34         283          765          652          758
Change in net unrealized
appreciation
on investments .................    (139)        102         164       (1,787)         400        1,119
                                --------    --------    --------    ---------    ---------    ---------
Net increase in net assets
resulting from operations ......   1,633       1,014       2,243        5,553        4,682        5,855
                                --------    --------    --------    ---------    ---------    ---------

DISTRIBUTIONS TO SHAREHOLDERS
From net investment income .....  (1,584)       (878)     (1,796)      (6,575)      (3,630)      (3,978)
From net realized gains
on investment transactions .....    (138)       --          (281)      (1,057)        (257)        (686)
                                --------    --------    --------    ---------    ---------    ---------
Decrease in net assets
from distributions .............  (1,722)       (878)     (2,077)      (7,632)      (3,887)      (4,664)
                                --------    --------    --------    ---------    ---------    ---------

CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold ......  20,609      12,276      25,373       50,409       22,424       24,839
Proceeds from shares issued
in connection with
acquisition (Note 5) ...........    --          --          --           --           --         60,519
Proceeds from reinvestment
of distributions ...............   1,504         780       1,901        6,300        3,161        3,963
Payments for shares redeemed ... (19,317)    (11,219)    (40,869)     (42,859)     (20,889)     (38,664)
                                --------    --------    --------    ---------    ---------    ---------
Net increase (decrease) in
net assets from capital
share transactions .............   2,796       1,837     (13,595)      13,850        4,696       50,657
                                --------    --------    --------    ---------    ---------    ---------
Net increase (decrease)
in net assets ..................   2,707       1,973     (13,429)      11,771        5,491       51,848

NET ASSETS
Beginning of period ............  38,410      36,437      49,866      137,907      132,416       80,568
                                --------    --------    --------    ---------    ---------    ---------
End of period ..................$ 41,117    $ 38,410    $ 36,437    $ 149,678    $ 137,907    $ 132,416
                                ========    ========    ========    =========    =========    =========
Undistributed net
investment income ..............$     18        --          --           --           --           --
                                ========    ========    ========    =========    =========    =========

TRANSACTIONS IN
SHARES OF THE FUNDS
Sold ...........................   2,019       1,208       2,515        4,768        2,127        2,387
Shares issued in connection
with acquisition (Note 5) ......    --          --          --           --           --          5,830
Issued in reinvestment of
distributions ..................     147          77         189          595          301          381
Redeemed .......................  (1,892)     (1,106)     (4,050)      (4,060)      (1,986)      (3,725)
                                --------    --------    --------    ---------    ---------    ---------
Net increase (decrease) ........     274         179      (1,346)       1,303          442        4,873
                                ========    ========    ========    =========    =========    =========
</TABLE>

(1)  The fiscal year end was changed from October 31 to May 31 for  Limited-Term
     Tax-Free  and  Intermediate-Term  Tax-Free,  resulting  in  a  seven  month
     reporting period.

See Notes to Financial Statements


                                                 www.americancentury.com      35


<TABLE>
<CAPTION>
Statements of Changes in Net Assets
- --------------------------------------------------------------------------------
                                                                    (Continued)

YEAR ENDED MAY 31, 1999, PERIOD ENDED MAY 31, 1998(1)
AND YEAR ENDED OCTOBER 31,1997

                                               LONG-TERM TAX-FREE             HIGH-YIELD MUNICIPAL
                                        MAY 31,      MAY 31,     OCT. 31,      MAY 31,     MAY 31,
Increase (Decrease) in Net Assets        1999         1998         1997         1999        1998
OPERATIONS                                       (In Thousands)
<S>                                     <C>          <C>          <C>          <C>          <C>
Net investment income ................  $5,808       $3,216       $3,377       $1,955       $106
Net realized gain (loss) on
  investments ........................   411         1,317        1,546         169         (17)
Change in net unrealized
  appreciation on investments ........  (2,257)        93          853          (83)         162
                                      ----------   ----------   ----------   ----------   ---------
Net increase in net assets
  resulting from operations ..........  3,962        4,626        5,776        2,041         251
                                      ----------   ----------   ----------   ----------   ---------

DISTRIBUTIONS TO SHAREHOLDERS
From net investment income ...........  (5,832)      (3,216)      (3,377)      (1,955)      (106)
From net realized gains on
  investment transactions ............  (1,702)       (725)        (823)        (136)        --
In excess of net realized gains
  on investment transactions .........   (278)         --           --           --          --
                                      ----------   ----------   ----------   ----------   ---------
Decrease in net assets
  from distributions .................  (7,812)      (3,941)      (4,200)      (2,091)      (106)
                                      ----------   ----------   ----------   ----------   ---------

CAPITAL SHARE TRANSACTIONS
Proceeds from shares sold ............  75,568       36,917       29,116       42,114      19,646
Proceeds from shares issued in
  connection with acquisition
  (Note 5) ...........................    --           --         52,028         --          --
Proceeds from reinvestment
  of distributions ...................  6,209        3,148        3,588        1,678         90
Payments for shares redeemed ......... (76,958)     (33,003)     (38,212)     (20,462)     (1,093)
                                      ----------   ----------   ----------   ----------   ---------
Net increase (decrease) in
  net assets from capital share
  transactions .......................  4,819        7,062        46,520       23,330      18,643
                                      ----------   ----------   ----------   ----------   ---------
Net increase (decrease) in
  net assets .........................   969         7,747        48,096       23,280      18,788

NET ASSETS
Beginning of period .................. 116,615      108,868       60,772       18,788        --
                                      ----------   ----------   ----------   ----------   ---------
End of period ........................ $117,584     $116,615     $108,868     $42,068      $18,788
                                      ==========   ==========   ==========   ==========   =========

TRANSACTIONS IN
SHARES OF THE FUNDS
Sold .................................  6,983        3,424        2,730        4,137        1,964
Shares issued in connection
  with acquisition (Note 5) ..........    --           --         4,905          --          --
Issued in reinvestment
  of distributions ...................    574          292          337          164           9
Redeemed .............................  (7,119)      (3,057)      (3,591)      (2,007)      (109)
                                      ----------   ----------   ----------   ----------   ---------
Net increase (decrease) ..............   438          659         4,381        2,294        1,864
                                      ==========   ==========   ==========   ==========   =========
</TABLE>

(1)  The fiscal year end was  changed  from  October 31 to May 31 for  Long-Term
     Tax-Free,  resulting  in a seven month  reporting  period.  For  High-Yield
     Municipal,  the period shown is March 31, 1998 (inception)  through May 31,
     1998.

- --------------------------------------------------------------------------------
UNDERSTANDING THE STATEMENTS OF CHANGES IN NET ASSETS--These statements show how
each fund's net assets changed over the past three reporting periods. It details
how much a fund grew or shrank as a result of:

* operations--a summary of the Statement of Operations for the most recent
  period

* distributions--income and gains distributed to shareholders

* capital share transactions--shareholders' purchases, reinvestments, and
  redemptions

Net  assets  at the  beginning  of  the  period  plus  the  sum  of  operations,
distributions and capital share transactions  result in net assets at the end of
the period.

                                              See Notes to Financial Statements


36      1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------

MAY 31, 1999

1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    ORGANIZATION -- American Century  Municipal Trust (the trust), is registered
under the Investment  Company Act of 1940 as an open-end  management  investment
company.  Limited-Term Tax-Free Fund (Limited-Term),  Intermediate-Term Tax-Free
Fund  (Intermediate-Term),  Long-Term  Tax-Free Fund  (Long-Term) and High-Yield
Municipal Fund  (High-Yield  Municipal)  (the funds) are four of the eight funds
issued by the trust. The funds,  except  High-Yield  Municipal,  are diversified
under  the 1940  Act.  The  objective  of  Limited-Term,  Intermediate-Term  and
Long-Term  is to seek as high a level of  current  income  exempt  from  federal
income  taxes  as  is  consistent   with  prudent   investment   management  and
conservation of shareholders'  capital.  High-Yield  Municipal's objective is to
seek as high a level of current  income  exempt from federal  income taxes as is
consistent with its investment policies,  which permit investment in lower-rated
and unrated  securities.  High-Yield  Municipal invests primarily in lower-rated
debt securities, which are subject to greater credit risk and consequently offer
higher  yields.  Securities  of this  type  are  subject  to  substantial  risks
including  price  volatility,  liquidity risk and default risk. The funds invest
primarily  in  municipal  obligations  with  maturities  based  on  each  fund's
investment  objective.  The funds may concentrate  their  investments in certain
states and  therefore  may have more  exposure to credit  risk  related to those
states than funds that have broader geographical diversification.  The following
significant  accounting  policies  are in  accordance  with  generally  accepted
accounting principles; these principles may require the use of estimates by fund
management.

    SECURITY  VALUATIONS -- Portfolio  securities  are valued at current  market
value as provided  by 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 Trustees.

    SECURITY  TRANSACTIONS -- Security  transactions are accounted for as of the
trade date. 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.

    INCOME  TAX  STATUS  -- It is  the  funds'  policy  to  distribute  all  net
investment  income  and net  realized  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.  For the year ended May 31,  1999,  100%
(unaudited) of the funds'  distributions  from net  investment  income have been
designated as exempt from federal income tax.

    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  realized  gains  and  losses  for  financial
statement  and tax purposes  and may result in  reclassification  among  certain
capital accounts.

    For the seven months ended May 31, 1999,  Long-Term and High-Yield Municipal
incurred net capital losses of $278,533 and $2,075, respectively. The funds have
elected to treat such losses as having been  incurred  in the  following  fiscal
year.

    FUTURES  CONTRACTS  -- The  funds  may buy and sell  interest  rate  futures
contracts  relating to debt  securities  and write and buy put and call  options
relating  to  interest  rate  futures  contracts.  The funds may use futures and
options  transactions  to maintain cash reserves while remaining fully invested,
to  facilitate  trading,  to  reduce  transaction  costs,  or to  pursue  higher
investment returns when a futures contracts is priced more attractively than its
underlying  security  or  index.  One of the  risks  of  entering  into  futures
contracts may include the possibility that the changes in value of the contracts
may not correlate with the changes in value of the underlying  securities.  Upon
entering into a futures contract, the fund is required to deposit either cash or
securities  in an amount equal to a certain  percentage  of the  contract  value
(initial margin).  Subsequent  payments  (variation margin) are made or received
daily,  in cash, by the fund. The variation  margin is equal to the daily change
in the contract  value and is recorded as an unrealized  gain or loss.  The fund
recognizes a realized gain or loss when the contract is closed or expires. There
were no open futures contracts at May 31, 1999.

    ADDITIONAL  INFORMATION  -- Funds  Distributor,  Inc.  (FDI) is the  trust's
distributor. Certain officers of FDI are also officers of the trust.

- --------------------------------------------------------------------------------
2. TRANSACTIONS WITH RELATED PARTIES

    The trust has entered  into a Management  Agreement  with  American  Century
Investment  Management,  Inc.  (ACIM) that  provides  each fund with  investment
advisory and management  services in exchange for a single,  unified  management
fee.  The  Agreement  provides  that  all  expenses  of the  funds,  except  for
brokerage,  taxes,  portfolio  insurance,  interest,  fees and expenses of those
Trustees  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 calculated daily and paid monthly.  It
consists of an  Investment  Category  Fee based on the average net assets of the
funds in a specific  fund's  investment  category and a Complex Fee based on the
average  net  assets  of all the  funds  managed  by  ACIM.  The  rates  for the
Investment  Category  Fee  range  from  0.1625%  to  0.2800%  for  Limited-Term,
Intermediate-Term,  and Long-Term and the rates for High-Yield  Municipal  range
from 0.2925% to 0.4100%. Rates for the Complex Fee range from 0.2900% to


                                                 www.americancentury.com      37


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)
MAY 31, 1999

0.3100%.  For the year ended May 31, 1999, the effective  annual  management fee
was 0.51% for  Limited-Term,  Intermediate-Term  and Long-Term.  ACIM waived all
expenses for High-Yield  Municipal from March 31, 1998 (inception) through April
30, 1999. As a result,  the effective  annual  management fee for the year ended
May 31, 1999 was 0.01%.  The  effective  annual  management  fee would have been
0.64% without the waiver.

    Certain  officers  and  trustees  of the  trust  are  also  officers  and/or
directors,  and,  as a  group,  controlling  stockholders  of  American  Century
Companies,  Inc., the parent of the trust's  investment  manager,  ACIM, and the
trust's transfer agent, American Century Services, Inc.

    As of May 31, 1999, Intermediate-Term had invested $1,830, and Long-Term had
invested  $5,862 in shares of  Tax-Free  Money  Market  Fund.  The terms of such
transactions  were identical to those with non-related  entities except that, to
avoid duplicate  management  fees,  Intermediate-Term  and Long-Term did not pay
ACIM management fees with respect to assets invested in Tax-Free Money Market.

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

  Investment transactions, excluding short-term investments, were as follows:

                                  INTERMEDIATE-
                   LIMITED-TERM       TERM         LONG-TERM      HIGH-YIELD
                     TAX-FREE       TAX-FREE        TAX-FREE       MUNICIPAL
PURCHASES                        (In Thousands)
Municipal Debt
  Obligations ...... $19,293        $58,016         $99,652         $59,076

PROCEEDS FROM SALES              (In Thousands)
Municipal Debt
  Obligations ...... $16,586        $46,115         $95,892         $31,745

    On May 31, 1999, the composition of unrealized appreciation and depreciation
of investment  securities based on the aggregate cost of investments for federal
income tax purposes was as follows:

                                   INTERMEDIATE-
                    LIMITED-TERM       TERM         LONG-TERM      HIGH-YIELD
                      TAX-FREE       TAX-FREE        TAX-FREE       MUNICIPAL
                                  (In Thousands)
Appreciation .......   $582           $4,647         $6,184           $ 308
Depreciation .......   (62)            (642)          (782)           (229)
                    ------------   ------------   -------------   -------------
Net ................   $520           $4,005         $5,402            $79
                    ============   ============   =============   =============

    The aggregate  cost of  investments  for federal income tax purposes was the
same as the cost for financial reporting purposes for the funds.

- --------------------------------------------------------------------------------
4. BANK LOANS

    Effective  December 18,  1998,  the funds,  along with  certain  other funds
managed by ACIM,  entered  into an  unsecured  $570,000,000  bank line of credit
agreement  with  Chase  Manhattan  Bank.  Borrowings  under the  agreement  bear
interest at the Federal  Funds rate plus 0.40%.  The funds may borrow  money for
temporary or emergency purposes to fund shareholder  redemptions.  The funds did
not borrow from the line  during the period  December  18, 1998  through May 31,
1999.


38      1-800-345-2021


Notes to Financial Statements
- --------------------------------------------------------------------------------
                                                                    (Continued)

MAY 31, 1999

- --------------------------------------------------------------------------------
5. REORGANIZATION PLAN

    On August 29, 1997, Limited-Term,  Intermediate-Term, and Long-Term acquired
all of the net assets of the American Century - Benham  Limited-Term  Tax-Exempt
Fund  (Limited-Term  Tax-Exempt),  American  Century - Benham  Intermediate-Term
Tax-Exempt Fund  (Intermediate-Term  Tax-Exempt),  and American Century - Benham
Long-Term Tax-Exempt Fund (Long-Term  Tax-Exempt),  respectively,  pursuant to a
plan of reorganization  approved by the acquired funds' shareholders on July 30,
1997.  The  surviving  funds  for the  purposes  of  maintaining  the  financial
statements and performance history in the  post-reorganization  are Limited-Term
Tax-Exempt,  Intermediate-Term Tax-Exempt, and Long-Term Tax-Exempt. These funds
were also reorganized as funds issued by American Century Municipal Trust.

    The  acquisition  was  accomplished  by a  tax-free  exchange  of  shares of
Limited-Term,  Intermediate-Term,  and  Long-Term of 3,729,594,  5,588,194,  and
4,402,660,  respectively,  for  3,729,594,  5,830,457,  and 4,904,754  shares of
Limited-Term Tax-Exempt, Intermediate-Term Tax-Exempt, and Long-Term Tax-Exempt,
respectively,   outstanding   on   August   29,   1997.   The  net   assets   of
Intermediate-Term   and  Long-Term  immediately  before  the  acquisitions  were
$60,519,330 and $52,028,294,  respectively.  Since  Limited-Term was not a legal
entity prior to the merger,  there were no assets  prior to the  reorganization.
Unrealized  appreciation of $2,290,179 and $3,743,216 for  Intermediate-Term and
Long-Term,  respectively, was combined with that of Intermediate-Term Tax-Exempt
and Long-Term  Tax-Exempt.  Immediately after the acquisition,  the combined net
assets of  Limited-Term,  Intermediate-Term,  and  Long-Term  were  $37,556,857,
$133,562,791, and $106,095,509, respectively.

- --------------------------------------------------------------------------------
6. FUND EVENTS

  The following name changes became effective March 1, 1999:

           =====================================================================
           NEW NAME                      FORMER NAME
           =====================================================================

  FUND:    Limited-Term Tax-Free Fund    American Century - Benham Limited-Term
                                         Tax-Free Fund

  FUND:    Intermediate-Term             American Century - Benham
           Tax-Free Fund                 Intermediate-Term Tax-Free Fund

  FUND:    Long-Term Tax-Free Fund       American Century - Benham Long-Term
                                         Tax-Free Fund

  FUND:    High-Yield Municipal Fund     American Century - Benham High-Yield
                                         Municipal Fund


                                                 www.americancentury.com      39


<TABLE>
<CAPTION>
Limited-Term Tax-Free--Financial Highlights
- --------------------------------------------------------------------------------

FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED MAY 31 (EXCEPT AS NOTED)

                                       1999      1998(1)    1997(1)    1996(1)    1995(1)    1994(1)
PER-SHARE DATA
Net Asset Value,
<S>                                   <C>        <C>        <C>        <C>         <C>       <C>
  Beginning of Period ............... $10.16     $10.11     $10.08     $10.09      $9.95     $10.04
                                     --------   --------   --------   --------   --------   --------
Income From Investment Operations
  Net Investment Income .............  0.40       0.24       0.41       0.43       0.44       0.36
  Net Realized and Unrealized
  Gain (Loss) on Investment
  Transactions ......................  0.01       0.05       0.10      (0.01)      0.14      (0.09)
                                     --------   --------   --------   --------   --------   --------
  Total From Investment Operations ..  0.41       0.29       0.51       0.42       0.58       0.27
                                     --------   --------   --------   --------   --------   --------

Distributions
  From Net Investment Income ........ (0.40)     (0.24)     (0.41)     (0.43)     (0.44)     (0.36)
  From Net Realized Gains on
  Investment Transactions ........... (0.03)       --       (0.07)       --         --         --
                                     --------   --------   --------   --------   --------   --------
  Total Distributions ............... (0.43)     (0.24)     (0.48)     (0.43)     (0.44)     (0.36)
                                     --------   --------   --------   --------   --------   --------
Net Asset Value, End of Period ...... $10.14     $10.16     $10.11     $10.08     $10.09      $9.95
                                     ========   ========   ========   ========   ========   ========
  Total Return(2) ...................  4.15%      2.87%      5.22%      4.26%      5.95%      2.75%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ...............  0.51%    0.52%(3)     0.59%    0.38%(4)    --(4)       --(4)
Ratio of Net Investment Income
to Average Net Assets ...............  3.93%    4.04%(3)     4.05%      4.28%      4.38%      3.62%
Portfolio Turnover Rate .............   41%        28%        74%        68%        78%        42%
Net Assets, End of Period
(in thousands) ......................$41,117    $38,410     $36,437   $49,866    $58,837     $60,857
</TABLE>

(1) The period ended May 31, 1998 represents a seven month reporting period. The
    fund's  fiscal  year end was  changed  from  October 31 to May 31 during the
    period. Periods prior to 1998 are based on a fiscal year ended October 31.

(2) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(3) Annualized.

(4) ACIM had voluntarily waived its management fee through February 29, 1996. In
    absence of the waiver, the ratio of operating expenses to average net assets
    would have been 0.60%.

- --------------------------------------------------------------------------------
UNDERSTANDING THE FINANCIAL HIGHLIGHTS--These  statements itemize current period
activity and  statistics  and provide  comparison  data for the last five fiscal
years.

On a per-share basis, it includes:

* share price at the beginning of the period

* investment income and capital gains or losses

* income and capital gains distributions paid to shareholders

* share price at the end of the period

It also includes some key statistics for the period:

* total return--the overall percentage return of the fund, assuming reinvestment
  of all distributions

* expense ratio--operating expenses as a percentage of average net assets

* net income ratio--net investment income as a percentage of average net assets

* portfolio turnover--the percentage of the portfolio that was replaced during
  the period

                                              See Notes to Financial Statements


40      1-800-345-2021


<TABLE>
<CAPTION>
Intermediate-Term Tax-Free--Financial Highlights
- --------------------------------------------------------------------------------

FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED MAY 31 (EXCEPT AS NOTED)

                                       1999      1998(1)    1997(1)    1996(1)    1995(1)    1994(1)
PER-SHARE DATA
Net Asset Value,
<S>                                   <C>        <C>        <C>        <C>        <C>        <C>
  Beginning of Period ............... $10.52     $10.46     $10.35     $10.45     $10.01     $10.75
                                     --------   --------   --------   --------   --------   --------
Income From Investment Operations
  Net Investment Income .............  0.48       0.28       0.49       0.48       0.49       0.48
  Net Realized and Unrealized
  Gain (Loss) on Investment
  Transactions ...................... (0.05)      0.08       0.21      (0.03)      0.52      (0.61)
                                     --------   --------   --------   --------   --------   --------
  Total From Investment Operations ..  0.43       0.36       0.70       0.45       1.01      (0.13)
                                     --------   --------   --------   --------   --------   --------
Distributions
  From Net Investment Income ........ (0.48)     (0.28)     (0.49)     (0.48)     (0.49)     (0.48)
  From Net Realized Gains on
  Investment Transactions ........... (0.08)     (0.02)     (0.10)     (0.07)     (0.08)     (0.13)
                                     --------   --------   --------   --------   --------   --------
  Total Distributions ............... (0.56)     (0.30)     (0.59)     (0.55)     (0.57)     (0.61)
                                     --------   --------   --------   --------   --------   --------
Net Asset Value, End of Period ...... $10.39     $10.52     $10.46     $10.35     $10.45     $10.01
                                     ========   ========   ========   ========   ========   ========
  Total Return(2) ...................  4.07%      3.50%      6.88%      4.47%     10.41%     (1.25)%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ...............  0.51%    0.51%(3)     0.58%      0.60%      0.60%      0.60%
Ratio of Net Investment Income
to Average Net Assets ...............  4.52%    4.62%(3)     4.71%      4.66%      4.77%      4.59%
Portfolio Turnover Rate .............   32%        17%      35%(4)       39%        32%        74%
Net Assets, End of Period
(in thousands) ......................$149,678   $137,907   $132,416   $80,568    $80,248     $81,400
</TABLE>

(1) The period ended May 31, 1998 represents a seven month reporting period. The
    fund's  fiscal  year end was  changed  from  October 31 to May 31 during the
    period. Periods prior to 1998 are based on a fiscal year ended October 31.

(2) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(3) Annualized.

(4) Purchases,  sales,  and market  value  amounts for Benham  Intermediate-Term
    Tax-Free Fund prior to the merger were excluded from the portfolio  turnover
    calculation.

See Notes to Financial Statements


                                                 www.americancentury.com      41


<TABLE>
<CAPTION>
Long-Term Tax-Free--Financial Highlights
- --------------------------------------------------------------------------------

FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED MAY 31 (EXCEPT AS NOTED)

                                       1999      1998(1)    1997(1)    1996(1)    1995(1)    1994(1)
PER-SHARE DATA
Net Asset Value,
<S>                                   <C>        <C>        <C>        <C>        <C>        <C>
  Beginning of Period ............... $10.81     $10.75     $10.58     $10.54     $9.75      $11.10
                                     --------   --------   --------   --------   --------   --------
Income From Investment Operations
  Net Investment Income .............  0.52       0.31       0.55       0.53       0.53       0.52
  Net Realized and Unrealized
  Gain (Loss) on Investment
  Transactions ...................... (0.15)      0.13       0.33       0.04       0.83      (1.01)
                                     --------   --------   --------   --------   --------   --------
  Total From Investment Operations ..  0.37       0.44       0.88       0.57       1.36      (0.49)
                                     --------   --------   --------   --------   --------   --------
Distributions
  From Net Investment Income ........ (0.52)     (0.31)     (0.55)     (0.53)     (0.53)     (0.52)
  From Net Realized Gains
  on Investment Transactions ........ (0.16)     (0.07)     (0.16)       --       (0.04)     (0.34)
  In Excess of Net Realized Gains
  on Investment Transactions ........ (0.02)       --         --         --         --         --
                                     --------   --------   --------   --------   --------   --------
  Total Distributions ............... (0.70)     (0.38)     (0.71)     (0.53)     (0.57)     (0.86)
                                     --------   --------   --------   --------   --------   --------
Net Asset Value, End of Period ...... $10.48     $10.81     $10.75     $10.58     $10.54     $9.75
                                     ========   ========   ========   ========   ========   ========
  Total Return(2) ...................  3.44%      4.18%      8.59%      5.60%     14.45%     (4.70)%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets ...............  0.51%    0.51%(3)     0.58%      0.59%      0.59%      0.60%
Ratio of Net Investment Income
to Average Net Assets ...............  4.86%    4.96%(3)     5.16%      5.06%      5.24%      5.00%
Portfolio Turnover Rate .............   80%        47%      65%(4)       60%        61%        66%
Net Assets, End of Period
(in thousands) ......................$117,584   $116,615   $108,868    $60,772    $57,997    $50,964
</TABLE>

(1) The period ended May 31, 1998 represents a seven month reporting period. The
    fund's  fiscal  year end was  changed  from  October 31 to May 31 during the
    period. Periods prior to 1998 are based on a fiscal year ended October 31.

(2) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(3) Annualized.

(4) Purchases,  sales,  and market value amounts for Benham  Long-Term  Tax-Free
    Fund  prior  to  the  merger  were  excluded  from  the  portfolio  turnover
    calculation.

                                              See Notes to Financial Statements


42      1-800-345-2021


High-Yield Municipal--Financial Highlights
- --------------------------------------------------------------------------------

FOR A SHARE OUTSTANDING THROUGHOUT THE YEARS ENDED MAY 31 (EXCEPT AS NOTED)

                                                 1999               1998(1)
PER-SHARE DATA
Net Asset Value, Beginning of Period ....     $    10.08         $     9.99
                                              ----------         ----------
Income From Investment Operations
Net Investment Income ...................           0.54               0.09
Net Realized and Unrealized Gain
on Investment Transactions ..............           0.07               0.09
                                              ----------         ----------
Total From Investment Operations ........           0.61               0.18
                                              ----------         ----------
Distributions
From Net Investment Income ..............          (0.54)             (0.09)
From Net Realized Gains on
Investment Transactions .................          (0.03)              --
                                              ----------         ----------
Total Distributions .....................          (0.57)             (0.09)
                                              ----------         ----------
Net Asset Value, End of Period ..........     $    10.12         $    10.08
                                              ==========         ==========
Total Return(2) .........................           6.18%              1.81%

RATIOS/SUPPLEMENTAL DATA
Ratio of Operating Expenses
to Average Net Assets(3) ................           0.01%              --
Ratio of Net Investment Income
to Average Net Assets(3) ................           5.28%              5.38%(4)
Portfolio Turnover Rate .................             92%                44%
Net Assets, End of Period
(in thousands) ..........................     $   42,068         $   18,788

(1) March 31, 1998 (inception) through May 31, 1998.

(2) Total  return   assumes   reinvestment   of  dividends   and  capital  gains
    distributions,  if any. Total returns for periods less than one year are not
    annualized.

(3) ACIM voluntarily  agreed to pay all expenses of the fund from March 31, 1998
    (inception)  through April 30, 1999. In absence of the waiver,  the ratio of
    operating  expenses  to average  net  assets  would have been 0.64% for both
    periods  (annualized for the period in 1998) and the ratio of net investment
    income to average net assets  would have been 4.66% and 4.74%  (annualized),
    for the year ended May 31, 1999 and the period  March 31,  1998  through May
    31, 1998, respectively.

(4) Annualized.

See Notes to Financial Statements


                                                 www.americancentury.com      43


Report of Independent Accountants
- --------------------------------------------------------------------------------

To the Trustees of the American Century Municipal Trust and Shareholders of the
Limited-Term Tax-Free Fund, Intermediate-Term Tax-Free Fund, Long-Term Tax-Free
Fund and High Yield Municipal Fund:

In our opinion, the accompanying statements of assets and liabilities, including
the schedules of  investments,  and the related  statements of operations and of
changes  in net assets  and the  financial  highlights  present  fairly,  in all
material respects, the financial position of the Limited-Term Tax-Free Fund, the
Intermediate-Term  Tax-Free Fund, the Long-Term Tax-Free Fund and the High Yield
Municipal Fund ( formerly the American  Century - Benham  Limited-Term  Tax-Free
Fund,  the  American  Century  - Benham  Intermediate-Term  Tax-Free  Fund,  the
American  Century  -Benham  Long-Term  Tax-Free Fund and the American  Century -
Benham  High  Yield  Municipal  Fund,   respectively  )  (  four  of  the  funds
constituting the American Century Municipal Trust,  hereafter referred to as the
"Funds") at May 31, 1999, and the results of their  operations for the year then
ended, the changes in their net assets and the financial highlights for the year
ended May 31,  1999,  the period  November 1, 1997  through May 31, 1998 and the
year   ended   October   31,   1997   for  the   Limited-Term   Tax-Free   Fund,
Intermediate-Term Tax-Free Fund and Long-Term Tax-Free Fund and the period March
31, 1998 through May 31, 1998 for the High Yield  Municipal  Fund, in conformity
with generally accepted accounting  principles.  These financial  statements and
financial highlights  (hereafter referred to as "financial  statements") are the
responsibility  of the Funds'  management;  our  responsibility is to express an
opinion  on these  financial  statements  based  on our  audits.  The  financial
highlights  for each of the three years in the period  ended  October 31,  1996,
were audited by other auditors, whose report, dated November 20, 1996, expressed
an  unqualified  opinion on those  statements.  We conducted our audits of these
financial  statements in accordance with generally accepted auditing  standards,
which require that we plan and perform the audit to obtain reasonable  assurance
about whether the financial  statements  are free of material  misstatement.  An
audit includes examining,  on a test basis,  evidence supporting the amounts and
disclosures in the financial  statements,  assessing the  accounting  principles
used and  significant  estimates made by management,  and evaluating the overall
financial  statement  presentation.  We believe that our audits,  which included
confirmation of securities at May 31, 1999 by correspondence  with the custodian
and brokers, provide a reasonable basis for the opinion expressed above.


                                                      PricewaterhouseCoopers LLP


Kansas City, Missouri
July 12, 1999


44      1-800-345-2021


Background Information
- --------------------------------------------------------------------------------

INVESTMENT PHILOSOPHY AND POLICIES

     American  Century offers 38 fixed-income  funds,  ranging from money market
portfolios  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:

     LIMITED-TERM  TAX-FREE  seeks  interest  income exempt from federal  income
taxes by  investing  in  municipal  securities.  The fund  maintains  a weighted
average maturity of five years or less.

     INTERMEDIATE-TERM TAX-FREE seeks interest income exempt from federal income
taxes by  investing  in  municipal  securities.  The fund  maintains  a weighted
average maturity of 5-10 years.

     LONG-TERM  TAX-FREE seeks interest  income exempt from federal income taxes
by investing  in municipal  securities.  The fund  maintains a weighted  average
maturity of 10 or more years.

     HIGH-YIELD  MUNICIPAL  seeks to  provide a high  level of  interest  income
exempt  from  federal  income  taxes by  investing  in  high-yielding  municipal
securities.  As a secondary objective, the fund seeks capital appreciation.  The
fund invests  primarily in lower-rated  or unrated  municipal  bonds,  which are
subject to greater credit and liquidity  risk. The fund has no average  maturity
restrictions but is expected to maintain a weighted average maturity of 10 years
or more.

     Investment income may be subject to state and local taxes and, depending on
your tax status,  the federal  alternative  minimum tax.  Capital  gains are not
exempt from federal income taxes.

COMPARATIVE INDICES

     The  following  indices  are  used  in  the  report  for  fund  performance
comparisons. They are not investment products available for purchase.

     The MERRILL LYNCH 0- TO 3-YEAR  MUNICIPAL INDEX has an average  maturity of
approximately two years. The bonds in the index have an average rating of AA1.

     The LEHMAN BROTHERS  FIVE-YEAR  MUNICIPAL  GENERAL  OBLIGATION INDEX has an
average  maturity of five years. The bonds are rated BBB or higher by Standard &
Poor's, with an average rating of AA.

     The  LEHMAN  BROTHERS  LONG-TERM   MUNICIPAL  BOND  INDEX  is  composed  of
investment-grade municipal bonds with maturities greater than 22 years.

LIPPER RANKINGS

     LIPPER 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 funds are:

     SHORT/INTERMEDIATE  MUNICIPAL DEBT FUNDS  (Limited-Term  Tax-Free) -- funds
that invest in municipal debt issues with dollar-weighted  average maturities of
1-5 years.

     INTERMEDIATE  MUNICIPAL  DEBT FUNDS  (Intermediate-Term  Tax-Free) -- funds
that invest in municipal debt issues with dollar-weighted  average maturities of
5-10 years.

     GENERAL  MUNICIPAL DEBT FUNDS (Long-Term  Tax-Free) -- funds that invest at
least  65% of their  assets in  municipal  debt  issues  in the top four  credit
ratings (AAA, AA, A, and BBB).

     HIGH-YIELD  MUNICIPAL DEBT FUNDS --funds that invest at least 50% of assets
in lower-rated municipal debt issues.

[right margin]

INVESTMENT TEAM LEADERS
   PORTFOLIO MANAGERS
     BRYAN KARCHER
     DAVE MACEWEN
     STEVEN PERMUT
     KEN SALINGER

MUNICIPAL CREDIT
RESEARCH TEAM
   MANAGER
     STEVEN PERMUT
   MUNICIPAL CREDIT ANALYSTS
     DAVID MOORE
     ROBERT MILLER
     BILL MCCLINTOCK
     TIM BENHAM
     BRAD BODE


                                                 www.americancentury.com      45


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 40-43.

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 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.

*  TAX-EQUIVALENT  YIELDS show the taxable  yields that  investors  in a federal
income tax bracket would have to earn before taxes to equal the fund's  tax-free
yield.

INVESTMENT TERMS

* BASIS POINT -- a basis point equals one  one-hundredth  of a percentage  point
(or 0.01%). Therefore, 100 basis points equals one percentage point (or 1%).

* YIELD CURVE -- a graphic  representation of the relationship  between maturity
and yield for  fixed-income  securities.  Yield curve  graphs  plot  lengthening
maturities along the horizontal axis and rising yields along the vertical axis.

PORTFOLIO STATISTICS

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

* WEIGHTED  AVERAGE  MATURITY  (WAM) -- a measurement  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.

* 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.

* 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 MUNICIPAL SECURITIES

* AMT PAPER --  instruments  with  income  subject  to the  federal  alternative
minimum tax.

* COPS/LEASES -- securities issued to finance public property improvements (such
as city halls and police stations) and equipment purchases.


46      1-800-345-2021


Glossary
- --------------------------------------------------------------------------------
                                                                    (Continued)

* GO BONDS -- general  obligation  securities  backed by the taxing power of the
issuer.

* LAND-SECURED  BONDS -- securities such as Mello-Roos  bonds and 1915-Act bonds
that are issued to finance real estate development projects.

* PREREFUNDED BONDS/ETM BONDS --securities refinanced or escrowed to maturity by
the issuer because of their premium coupons (higher-than-market interest rates).
These  bonds  tend to have  higher  credit  ratings  because  they are backed by
Treasury securities.

* REVENUE  BONDS --  securities  backed by  revenues  from sales taxes or from a
specific project, system, or facility (such as a hospital,  electric utility, or
water system).

FUND CLASSIFICATIONS

INVESTMENT OBJECTIVE

     The investment  objective may be based on the fund's objective as stated in
its  prospectus or fund profile,  or the fund's  categorization  by  independent
rating organizations based on its management style.

* CAPITAL  PRESERVATION  -- offers  taxable and tax-free  money market funds for
relative stability of principal and liquidity.

* INCOME -- offers funds that can provide current income and competitive yields,
as well as a strong and stable  foundation and generally lower volatility levels
than stock funds.

* GROWTH & INCOME --  offers  funds  that  emphasize  both  growth  and  income,
provided  by either  dividend-paying  equities  or a  combination  of equity and
fixed-income securities.

* GROWTH -- offers  funds with a focus on  capital  appreciation  and  long-term
growth,  generally providing high return potential with corresponding high price
fluctuation risk.

RISK

     The  classification  of funds  by risk  category  is based on  quantitative
historical  measures  as well as  qualitative  prospective  measures.  It is not
intended to be a precise  indicator of future risk or return levels.  The degree
of risk within each category can vary significantly,  and some fund returns have
historically  been  higher  than  more  aggressive  funds  or  lower  than  more
conservative  funds.  Please be aware that the fund's  category  may change over
time.  Therefore,  it is  important  that you read a fund's  prospectus  or fund
profile carefully before investing to ensure its objectives,  policies, and risk
potential are consistent with your needs.

*  CONSERVATIVE  -- these funds  generally  provide lower return  potential with
either low or minimal price fluctuation risk.

* MODERATE -- these funds  generally  provide  moderate  return  potential  with
moderate price fluctuation risk.

*  AGGRESSIVE  -- these  funds  generally  provide  high return  potential  with
corresponding high price fluctuation risk.


                                                 www.americancentury.com      47


Notes
- --------------------------------------------------------------------------------


48      1-800-345-2021


[inside back cover]

===============================================================================
INVESTMENT OBJECTIVE - CAPITAL PRESERVATION
===============================================================================

                  RISK LEVEL - CONSERVATIVE

TAXABLE MONEY MARKETS           TAX-FREE MONEY MARKETS

Premium  Capital Reserve        FL Municipal Money Market
Prime Money Market              CA Municipal Money Market
Premium Government Reserve      CA Tax-Free Money Market
Government Agency               Tax-Free Money Market
   Money Market
Capital Preservation

===============================================================================
INVESTMENT OBJECTIVE - INCOME
===============================================================================

                   RISK LEVEL - AGGRESSIVE

TAXABLE BONDS                   TAX-FREE BONDS

Target 2025*                    CA High-Yield Municipal
Target 2020*                    High-Yield Municipal
Target 2015*
Target 2010*
High-Yield
International Bond

                    RISK LEVEL - MODERATE

TAXABLE BONDS                   TAX-FREE BONDS

Long-Term Treasury              CA Long-Term Tax-Free
Target 2005*                    Long-Term Tax-Free
Bond                            CA Insured Tax-Free
Premium Bond

                   RISK LEVEL - CONSERVATIVE

TAXABLE BONDS                   TAX-FREE BONDS

Intermediate-Term Bond          CA Intermediate-Term Tax-Free
Intermediate-Term Treasury      AZ Intermediate-Term Municipal
GNMA                            FL Intermediate-Term Municipal
Inflation-Adjusted Treasury     Intermediate-Term  Tax-Free
Limited-Term Bond               CA Limited-Term  Tax-Free
Target 2000*                    Limited-Term Tax-Free
Short-Term Government
Short-Term Treasury

===============================================================================
INVESTMENT OBJECTIVE - GROWTH AND INCOME
===============================================================================

                     RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY

Small Cap Quantitative
Small Cap Value

                      RISK LEVEL - MODERATE

ASSET ALLOCATION/BALANCED       DOMESTIC EQUITY        SPECIALTY

Strategic Allocation --         Equity Growth          Utilities
   Aggressive                   Equity Index           Real Estate
Balanced                        Tax-Managed Value
Strategic Allocation --         Income & Growth
   Moderate                     Value
Strategic Allocation --         Equity Income
   Conservative

===============================================================================
INVESTMENT OBJECTIVE - GROWTH
===============================================================================

                      RISK LEVEL - AGGRESSIVE

DOMESTIC EQUITY                 SPECIALTY              INTERNATIONAL

New Opportunities               Global Gold            Emerging Markets
Giftrust(reg.tm)                                       International Discovery
Vista                                                  International Growth
Heritage                                               Global Growth
Growth
Ultra(reg.tm)
Select

                       RISK LEVEL - MODERATE

SPECIALTY

Global Natural Resources


The investment  objective may be based on the fund's  objective as stated in its
prospectus or fund profile,  or the fund's  categorization by independent rating
organizations based on its management style.

The classification of funds by risk category is based on quantitative historical
measures as well as qualitative prospective measures. It is not intended to be a
precise  indicator  of future risk or return  levels.  The degree of risk within
each category can vary  significantly,  and some fund returns have  historically
been higher than more aggressive  funds or lower than more  conservative  funds.
Please be aware that a fund's  category may change over time.  Therefore,  it is
important  that you read a fund's  prospectus or fund profile  carefully  before
investing to ensure its  objectives,  policies and risk potential are consistent
with your needs.

For a definition of fund categories, see the Glossary.

*  While listed within the Income investment objective,  the Target funds do not
   pay current dividend income.  Income dividends are distributed once a year in
   December. The Target funds are listed in all three risk categories due to the
   dramatic  price  volatility  investors may  experience  during certain market
   conditions.  If held  to  their  target  dates,  however,  they  can  offer a
   conservative, dependable way to invest for a specific time horizon.

Please call  1-800-345-2021  for a prospectus or profile on any American Century
fund.  These  documents  contain  important  information  including  charges and
expenses, and you should read them carefully before you invest or send money.


[back cover]

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

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

WWW.AMERICANCENTURY.COM

INVESTOR RELATIONS
1-800-345-2021 OR 816-531-5575

AUTOMATED INFORMATION LINE
1-800-345-8765

FAX: 816-340-7962

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

BUSINESS, NOT-FOR-PROFIT, EMPLOYER-SPONSORED RETIREMENT PLANS
1-800-345-3533

AMERICAN CENTURY MUNICIPAL TRUST

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.

- --------------------------------------------------------------------------------
American Century Investments                                      BULK RATE
P.O. Box 419200                                               U.S. POSTAGE PAID
Kansas City, MO 64141-6200                                    AMERICAN CENTURY
www.americancentury.com                                           COMPANIES

9907                                                    Funds Distributor, Inc.
SH-ANN-17028                      (c)1999 American Century Services Corporation


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