THORNBURG INVESTMENT TRUST
N-30D, 1998-11-30
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Thornburg New Mexico Intermediate Municipal Fund
Fund facts. . . as of 9/30/98

                                  Thornburg
                             New Mexico Intermediate
                               Municipal Fund
                                 A Shares
SEC Yield                          3.66%
Taxable Equiv. Yields              6.62%
NAV                               $13.45
Max. Offering Price               $13.94

Total returns. . . as of 9/30/98 
(Annual Average - After Subtracting Maximum  Sales Charge)

One Year                           2.38%
Five Year                          4.24%
Since Inception                    6.19%  
Inception Date    (6/18/91)

The taxable  equivalent  yield assumes a 39.6% marginal  federal tax rate and an
8.50% marginal New Mexico rate.
The  investment  return and  principal  value of an  investment in the fund will
fluctuate so that, when redeemed, an investor's shares may be worth more or less
than their original  cost.  Maximum sales charge of the Fund's Class A Shares is
3.50%. The Fund's Class C Shares were converted to Class A Shares on January 31,
1996. The data quoted  represent past  performance and may not be construed as a
guarantee of future results.

Letter to shareholders
November 6, 1998


Dear Shareholder,
We are  pleased to present  the Annual  Report for the New Mexico  Portfolio  of
Thornburg  Intermediate  Municipal Fund for the fiscal year ending September 30,
1998.  The net asset  value  increased  17 cents per share to $13.45  during the
year. If you were with us for the entire period,  you received dividends of 61.9
cents per share. If you reinvested  your dividends,  you received 63.3 cents per
share. Your Thornburg New Mexico Intermediate Municipal Fund portfolio currently
holds  over 160  municipal  obligations  from  around  New  Mexico and from U.S.
Territories  which can issue "double exempt"* bonds here.  Approximately  90% of
the bonds are rated A or  better  by one of the major  rating  agencies.  As you
know,  we "ladder" the  maturities  of the bonds in your  portfolio so that some
bonds are  scheduled  to mature at par during each of the coming  years.  Today,
your fund's weighted average maturity is approximately  6.8 years, and we always
keep it below 10 years.  Percentages  of the  portfolio  maturing  in the coming
years are summarized below:


                 % of portfolio               Cumulative %
                 maturing within          maturing by end of

                  2 years =11%              year 2 = 11%  
            2 to 4 years = 21%              year 4 = 32%
            4 to 6 years = 15%              year 6 = 47%  
            6 to 8 years = 19%              year 8 = 66%
           8 to 10 years = 14%             year 10 = 80%  
           10 to 12 years = 5%             year 12 = 85%
           12 to 14 years = 5%             year 14 = 90%  
           14 to 16 years = 6%             year 16 = 96%
           16 to 18 years = 3%             year 18 = 99%
            Over 18 years = 1%

Over the last year your average portfolio maturity has increased  slightly.  The
passage of time  shortened the maturities of the bonds we owned at the beginning
of the year.  Until  mid-summer,  we directed  portfolio cash flow and new money
into the longer half of your bond  ladder,  taking  advantage  of the  plentiful
supply and good  selection  of new  municipal  bonds coming to market this year.
Today, we are managing the portfolio to keep the average maturity  approximately
where it is. We will stick with this approach if interest rates remain stable or
decrease. If bond yields increase, we will slightly extend the average portfolio
maturity.  This would permit us to increase our dividend yields if higher yields
are available. For the past 4 years Americans have been net sellers of municipal
and government bonds. Investment dollars have flowed instead to equities,  money
market investments,  and (until recently) overseas opportunities.  A combination
of sharp volatility in equity markets  worldwide and deflationary  winds blowing
from Asia may be rekindling the appetite of U.S.  investors for bond  investing,
although the money flows to the U.S.  bond market are not yet  significant  from
domestic investors.  If the Federal Reserve cuts short term interest rates again
in the coming months, some of the money now flowing into money market funds* may
begin to move to intermediate  and longer maturity bonds.  Assets of these money
market funds* now total over $1.3  trillion!  As the  accompanying  graph shows,
long term interest rates dropped  considerably  in the last year in anticipation
of an economic slowdown and an expected drop in short term interest rates. Since
September 30, short maturity interest rates have fallen further, while very long
maturity rates have increased slightly.  Muni yields in New Mexico were slightly
lower than those shown above for the U.S.  municipal bond market as a whole. Any
observer must be impressed by the fundamental strength of the broad U.S. economy
and of New Mexico's.  More people than ever before are working.  Wages are firm.
But tax  receipts  are  beginning  to slow  down,  and  government  spending  is
accelerating. Taken as a whole, U.S. cities continue to increase their financial
reserves for the fifth  consecutive  year. Most states report similar  favorable
news, but there is one possible  cloud:  if the U.S.  economy slows as state and
local  government  spending  accelerates,  some  entities  will not  manage  the
transition  smoothly.  If the current strength of the U.S. economy persists,  we
expect long maturity  interest  rates to increase in 1999. If our economy slows,
short maturity bond rates and money market  interest rates will quickly drop. We
believe the U.S.  economy will not go down without a fight.  Over the years, our
practice of laddering a diversified portfolio of short and intermediate maturity
bonds has allowed your fund to  consistently  perform  well in varying  interest
rate  environments.  Your fund has earned  Morningstar's 4 star overall rating**
for risk  adjusted  performance.  We would  like to  attribute  this to  capable
execution of a sensible  investment  strategy over time. Thank you for investing
in Thornburg New Mexico Intermediate Municipal Fund. Sincerely,

Brian J. McMahon  George T. Strickland
Portfolio Manager Portfolio Manager

*A portion of the income may be subject to the federal alternative minimum tax.
*Money market funds strive to keep a stable net asset value. The net asset value
of the fund can and does fluctuate.  **Morningstar  proprietary  rating reflects
historical  risk  adjusted  performances  as of 9/30/98.  Ratings are subject to
change every month.  Funds with at least three years of performance  history are
assigned  ratings from one star  (lowest) to five stars  (highest).  Morningstar
overall  ratings are  calculated  from the funds'  three-,  five-,  and ten year
average annual returns and a risk factor that reflects fund performance relative
to three month Treasury bill returns. 10% of the funds in an investment category
receive five stars and 22.5% receive four stars. THNMX is ranked 4 stars for the
3 year period and  4-stars  for the 5 year period . At 9/30/98,  there were 1581
bond funds with  3-year  ratings and 943 with  5-year  ratings in  Morningstar's
Single State  Intermediate  category.  Past performance  cannot guarantee future
results.

Statement of assets and liabilities
Thornburg New Mexico Intermediate Municipal Fund
September 30, 1998

ASSETS

Investments at value (cost $144,227,271)                        $ 152,869,343
Cash                                                                  110,874
Receivable for fund shares sold                                        73,691
Receivable for investments sold                                       210,968
Interest receivable                                                 2,417,186
Prepaid expenses and other assets                                       3,353
Total Assets                                                      155,685,415

LIABILITIES

Payable for investments purchased                                   2,086,140
Payable for fund shares redeemed                                       29,220
Accounts payable and accrued expenses                                 145,954
Payable to investment advisor                                          75,570
Dividends payable                                                     230,374
Total Liabilities                                                   2,567,258

NET ASSETS                                                      $ 153,118,157

NET ASSET VALUE:

Class A Shares:
Net asset value and redemption price per share ($153,118,157
applicable to 11,385,588 shares of beneficial interest
outstanding - Note 4)                                           $       13.45

Maximum sales charge, 3.50 % of offering
price (3.63% of net asset value per share)                               0.49

Maximum Offering Price Per Share                                $       13.94

See notes to financial statements.

Statement of operations
Thornburg New Mexico Intermediate Municipal Fund
Year Ended September 30, 1998

INVESTMENT INCOME:
Interest income (net of premium amortized of $395,808)    $ 8,487,273

EXPENSES:
Investment advisory fees (Note 3)                             752,824
Administration fees (Note 3)                                  188,206
Service fees (Note 3)                                         360,716
Transfer agent fees                                            78,740
Custodian fees                                                 97,495
Registration and filing fees                                    3,485
Professional fees                                              22,300
Accounting fees                                                16,282
Trustee fees                                                    2,875
Other expenses                                                 16,010

Total Expenses                                              1,538,933

Less:
Expenses reimbursed by investment advisor (Note 3)            (40,082)

Net Expenses                                                1,498,851

Net Investment Income                                       6,988,422

REALIZED AND UNREALIZED GAIN
(LOSS) ON INVESTMENTS (NOTE 5)
Net realized gain (loss) on investments sold                  (39,034)
Increase in unrealized appreciation of investments          1,951,956

Net Realized And Unrealized
Gain On Investments                                         1,912,922

Net Increase In Net Assets Resulting
From Operations                                           $ 8,901,344

See notes to financial statements.

Statement of changes in net assets
Thornburg New Mexico Intermediate Municipal Fund
         Year Ended        Year Ended
         September 30, 1998         September 30, 1997

INCREASE (DECREASE) IN NET ASSETS FROM:


OPERATIONS:
Net investment income                         $       6,988,422    $ 6,519,944
Net realized gain (loss) on investments sold            (39,034)        47,136
Increase in unrealized appreciation of investment     1,951,956      1,882,098

Net Increase In Net Assets Resulting From Operati     8,901,344      8,449,178

DIVIDENDS TO SHAREHOLDERS:
From net investment income
Class A Shares                                       (6,988,422)    (6,519,944)


FUND SHARE TRANSACTIONS - (Note 4):
Class A Shares                                        5,355,054     12,614,019

Net Increase in Net Assets                            7,267,976     14,543,253


NET ASSETS:

Beginning of year                                   145,850,181    131,306,928

End of year                                $        153,118,157 $  145,850,181

See notes to financial statements.


Notes to financial statements
September 30, 1998

Note 1 - Organization
Thornburg New Mexico  Intermediate  Municipal Fund (the "Fund"),  is a series of
Thornburg  Investment  Trust  (the  "Trust").   The  Trust  is  organized  as  a
Massachusetts business trust under a Declaration of Trust dated June 3, 1987 and
is registered as a diversified, open-end management investment company under the
Investment Company Act of 1940, as amended. The Trust is currently issuing seven
classes  of shares of  beneficial  interest  in  addition  to those of the Fund:
Thornburg Florida  Intermediate  Municipal Fund, Thornburg New York Intermediate
Municipal Fund,  Thornburg  Intermediate  Municipal Fund, Thornburg Limited Term
U.S. Government Fund,  Thornburg Limited Term Income Fund,  Thornburg Value Fund
and  Thornburg  Global Value Fund.  Each series is  considered  to be a separate
entity for financial reporting and tax purposes. The Fund's investment objective
is to obtain as high a level of current income exempt from Federal income tax as
is consistent with the  preservation of capital.  The Fund currently  offers one
class of shares of beneficial interest, Class A shares. On January 31, 1996, all
existing  Class  C  shares  were  converted  at net  asset  value,  without  the
imposition  of a deferred  sales  charge,  into Class A shares of an  equivalent
value. The Fund no longer offers Class B or Class C shares.

Note 2 - Significant  Accounting Policies Significant accounting policies of the
Fund are as follows:
Valuation of Investments:  In determining net asset value,  the Fund utilizes an
independent pricing service approved by the Trustees. Debt investment securities
have a primary market over the counter and are valued on the basis of valuations
furnished  by  the  pricing  service.   The  pricing  service  values  portfolio
securities at quoted bid prices or the yield equivalents when quotations are not
readily available. Securities for which quotations are not readily available are
valued at fair value as  determined  by the pricing  service using methods which
include consideration of yields or prices of municipal obligations of comparable
quality, type of issue, coupon,  maturity,  and rating;  indications as to value
from dealers and general market conditions. The valuation procedures used by the
pricing service and the portfolio  valuations  received by the Fund are reviewed
by the  officers  of the Trust under the general  supervision  of the  Trustees.
Short-term obligations having remaining maturities of 60 days or less are valued
at amortized cost, which approximates market value.  Federal Income Taxes: It is
the policy of the Fund to comply with the  provisions  of the  Internal  Revenue
Code applicable to "regulated investment companies" and to distribute all of its
taxable  (if  any) and tax  exempt  income  to its  shareholders.  Therefore  no
provision for Federal income tax is required. Dividends paid by the Fund for the
year ended  September 30, 1998 represent  exempt  interest  dividends  which are
excludable by  shareholders  from gross income for Federal  income tax purposes.
When-Issued  and  Delayed  Delivery   Transactions:   The  Fund  may  engage  in
when-issued or delayed delivery transactions.  To the extent the Fund engages in
such  transactions,  it  will  do so for  the  purpose  of  acquiring  portfolio
securities  consistent with its investment objectives and not for the purpose of
investment  leverage or to speculate on interest rate  changes.  At the time the
Fund makes a commitment to purchase a security on a when-issued  basis,  it will
record the transaction and reflect the value in determining the Fund's net asset
value.  When  effecting  such  transactions,  assets  of the  Fund of an  amount
sufficient to make payment for the portfolio  securities to be purchased will be
segregated on the Fund's  records on the trade date.  Securities  purchased on a
when-issued or delayed  delivery basis do not earn interest until the settlement
date.  Dividends:  Net  investment  income  of the Fund is  declared  daily as a
dividend on shares for which the Fund has received  payment.  Dividends are paid
monthly and are  reinvested in additional  shares of the Fund at net asset value
per share at the close of  business  on the  dividend  payment  date,  or at the
shareholder's  option, paid in cash. Net capital gains, to the extent available,
will be distributed annually. General: Securities transactions are accounted for
on a trade date  basis.  Interest  income is accrued  as  earned.  Premiums  and
original issue discounts on securities  purchased are amortized over the life of
the respective securities. Realized gains and losses from the sale of securities
are recorded on an identified cost basis.  Use of Estimates:  The preparation of
financial   statements,   in  conformity  with  generally  accepted   accounting
principles,  requires  management to make estimates and assumptions  that affect
the reported  amounts of assets and liabilities and the disclosure of contingent
assets and liabilities at the date of the financial  statements and the reported
amounts of  increases  and  decreases in net assets from  operations  during the
reporting period. Actual results could differ from those estimates.

Note 3 - Investment Advisory Fee and Other Transactions With Affiliates
Pursuant to an investment advisory agreement, Thornburg Management Company, Inc.
(the "Adviser") serves as the investment adviser and performs services for which
the fees are payable at the end of each month.  For the year ended September 30,
1998, these fees were payable at annual rates ranging from 1/2 of 1% to 11/40 of
1% of the average  daily net assets of the Fund,  depending  on the Fund's asset
size. The Fund also has an Administrative  Services  Agreement with the Adviser,
whereby  the  Adviser  will  perform  certain  administrative  services  for the
shareholders  of each  class of the  Fund's  shares,  and for which fees will be
payable  at an annual  rate of up to 1/8 of 1% of the  average  daily net assets
attributable to each class of shares. For the year ended September 30, 1998, the
Adviser voluntarily  reimbursed certain operating expenses amounting to $40,082.
The Fund has an  underwriting  agreement with Thornburg  Securities  Corporation
(the "Distributor"),  which acts as the Distributor of Fund shares. For the year
ended September 30, 1998, the Distributor earned commissions aggregating $43,019
from the sale of Class A shares. Pursuant to a Service Plan, under Rule 12b-1 of
the  Investment  Company Act of 1940,  the Fund may  reimburse to the Adviser an
amount not to exceed .25 of 1% per annum of the average net assets  attributable
to each  class of  shares  of the  Fund  for  payments  made by the  Adviser  to
securities   dealers  and  other   financial   institutions  to  obtain  various
shareholder  related  services.  The  Adviser  may  pay  out  of its  own  funds
additional expenses for distribution of the Fund's shares.  Certain officers and
trustees  of the Trust are also  officers  and/or  directors  of the Adviser and
Distributor. The compensation of unaffiliated trustees is borne by the Trust.

Note  4 - Shares of Beneficial Interest
At  September  30, 1998 there were an unlimited  number of shares of  beneficial
interest authorized,  and capital paid-in aggregated $145,225,495.  Transactions
in shares of beneficial interest were as follows:

                            Yr Ended Sept 30, 1998       Yr Ended Sept 30, 1997
Class A Shares                Shares       Amount       Shares      Amount
Shares sold                  2,157,467 $ 28,797,690    2,547,704 $ 33,589,237
Shares issued to shareholders in
reinvestment of distributi     316,508    4,224,103      311,386    4,074,878
Shares repurchased          (2,073,534) (27,666,739)  (1,904,494) (25,050,096)

Net Increase                   400,441 $  5,355,054      954,596   12,614,019

Note 5 - Securities Transactions
For the  year  ended  September  30,  1998,  the  Fund  had  purchase  and  sale
transactions  (excluding  short-term  securities) of $32,923,693 and $20,336,760
respectively.  The cost of  investments  for  Federal  Income  tax  purposes  is
$144,254,832.  At September 30, 1998, net unrealized appreciation of investments
was $8,614,511  resulting from  $8,635,313  gross  unrealized  appreciation  and
$20,802 gross  unrealized  depreciation.  Accumulated  net realized  losses from
securities  transactions included in net assets at September 30, 1998 aggregated
$749,410.  For Federal income tax purposes,  the Fund has realized  capital loss
carryforwards  of $688,815  from prior fiscal years  available to offset  future
realized  capital  gains.  To the extent that such  carryforwards  are used,  no
capital gains  distributions will be made. The carryforwards  expire as follows:
September 30, 2003 - $126,738,  September 30, 2004 - $554,899, and September 30,
2006 - $7,178.

<TABLE>
<CAPTION>
Financial highlights
Thornburg New Mexico Intermediate Municipal Fund
Per share operating  performance (for a share  outstanding  throughout the year)
                                                 Year Ended September 30,
<S>                                      <C>       <C>       <C>       <C>     <C> 
                                         1998      1997      1996      1995    1994

Class A Shares:
Net asset value, beginning of year $   13.28 $   13.09 $   13.12 $   12.72 $   13.36

Income from investment operations:
Net investment income                   0.62      0.64      0.63      0.60      0.60
Net realized and unrealized
gain (loss) on investments              0.17      0.19     (0.03)     0.40     (0.63)

Total from investment operations        0.79      0.83      0.60      1.00     (0.03)
Less dividends from:
Net investment income                  (0.62)    (0.64)    (0.63)    (0.60)    (0.60)
Realized capital gains                  0.00      0.00      0.00      0.00     (0.01)

Change in net asset value               0.17      0.19     (0.03)     0.40     (0.64)

Net asset value, end of year       $   13.45 $   13.28 $   13.09 $   13.12  $  12.72

Total return (a)                        6.08%     6.51%     4.68%     8.10%    (0.26)%

Ratios/Supplemental Data Ratios to average net asset:
Net investment income                   4.64%     4.88%     4.81%     4.71%     4.58%
Expenses, after expense reductions      1.00%     1.00%     1.00%     1.00%     0.90%
Expenses, before expense reductions     1.02%     1.05%     1.07%     1.06%     1.04%

Portfolio turnover rate                13.74%    10.06%    10.88%    17.06%     6.87%

Net assets at end of year (000)    $ 153,118   $ 145,850 $ 131,307  $136,742  $ 143,910

<FN>
(a) Sales loads are not reflected in computing total return.
</FN>
</TABLE>
<TABLE>
<CAPTION>

Schedule of Investments
Thornburg New Mexico Intermediate Municipal Fund
September 30, 1998    CUSIPS: Class A - 885-215-301; NASDAQ Symbol: Class A - THNMX

<C>           <C>                                                     <C>             <C>       
3,000,000     Alamogordo Hospital Revenue, 5.30% due 1/1/13 (Gerald    NR/A-           $3,100,800
              Champion Memorial Hospital Project)
896,000       Albuquerque Collateralized Mortgage, Municipal Class     Aaa/AAA         389,760
              B-2, 0% due 5/15/11
1,280,000     Albuquerque Gross Receipt and Lodgers Tax, 0% due        Aaa/AAA         1,110,963
              7/1/02 (Insured: FSA)
1,520,000     Albuquerque Gross Receipt and Lodgers Tax, 0% due        Aaa/AAA         1,264,488
              7/1/03 (Insured: FSA)
2,035,000     Albuquerque Gross Receipt and Lodgers Tax, 0% due        Aaa/AAA         1,556,429
              7/1/05 (Insured: FSA)
2,000,000     Albuquerque Gross Receipt and Lodgers Tax, 0% due        Aaa/AAA         1,060,000
              7/1/12 (Insured: FSA)
1,000,000     Albuquerque Gross Receipt Tax Revenue, 5.375% due        NR/AA           1,010,480
              7/1/01 (Bluewater Apartment Project)
50,000        Albuquerque Gross Receipt Tax Revenue, 6.20% due 7/1/05  A1/AA           54,729
2,000,000     Albuquerque Hospital Revenue Series A, 5.60% due         Aaa/AAA         2,035,640
              8/1/99 (Insured: MBIA)
335,000       Albuquerque Hospital Revenue Series A, 5.80% due         Aaa/AAA         347,164
              8/1/00 (Presbyterian Healthcare Project; Insured: MBIA)
2,500,000     Albuquerque Hospital Revenue Series A, 6.10% due         Aaa/AAA         2,694,975
              8/1/02 (Insured: MBIA)
1,000,000     Albuquerque Hospital Revenue Series A, 6.375% due        Aaa/AAA         1,085,760
              5/15/04 pre-refunded 5/15/01 @ 102 (St. Joseph
              Healthcare Systems Project)
300,000       Albuquerque Hospital Revenue Series A, 6.625% due        Aaa/AAA         327,588
              5/15/10 pre-refunded 5/15/01 @ 102 (St. Joseph
              Healthcare Systems Project)
1,040,000     Albuquerque Hospital Revenue Series B, 6.20% due         Aaa/AAA         1,058,096
              8/1/02 (Insured: MBIA)
1,775,000     Albuquerque Hospital Revenue Series B, 6.60% due         Aaa/AAA         1,810,713
              8/1/07 (Insured: MBIA)
2,235,000     Albuquerque Industrial Development Revenue, 5.80% due    A1/NR           2,378,152
              6/1/07 (Universal Printing & Publishing Project; LOC:
              First Security Bank)
1,195,000     Albuquerque MFHR Series 1991, 8.50% due 7/1/21 put       NR/NR           1,228,759
              7/1/01, (Beach Apartment Project)
2,915,000     Albuquerque MFHR Series 1994, 6.75% due 1/1/24 put       NR/NR           2,945,607
              1/1/04, (Dorado Village Project)
290,000       Albuquerque Revenue Refunding Bonds Series 1993, 5.00%   Aaa/AAA         299,486
              due 6/1/01 (Evangelical Lutheran Good Samaritan
              Society Project; Insured: FSA)
305,000       Albuquerque Revenue Refunding Bonds Series 1993, 5.10%   Aaa/AAA         318,551
              due 6/1/02 (Evangelical Lutheran Good Samaritan
              Society Project; Insured: FSA)
170,000       Albuquerque Revenue Refunding Bonds Series 1993, 5.20%   Aaa/AAA         179,789
              due 6/1/03 (Evangelical Lutheran Good Samaritan
              Society Project; Insured: FSA)
50,000        Albuquerque Special Assessment District 219 Series B,    NR/A-           50,069
              5.65% due 7/1/01 (Water and Sewer Improvement Project;
              LOC: Sumitomo Bank)
405,000       Albuquerque Special Assessment District 219 Series B,    NR/A-           405,644
              5.75% due 7/1/02 (Water and Sewer Improvement Project;
              LOC: Sumitomo Bank)
780,000       Albuquerque Special Assessment District Series A,        NR/A-           784,001
              6.45% due 1/1/15 (Cottonwood Mall Project; LOC:
              Sumitomo Bank)
1,500,000     Albuquerque Water & Sewer Revenue, 7.00% due 7/1/03      Aa3/AA          1,608,885
600,000       Albuquerque Water & Sewer Revenue, 6.25% due 7/1/08      Aa3/AA          656,688
1,750,000     Albuquerque Water & Sewer Revenue Series 1990-C, 7.00%   Aa3/AA          1,880,130
              due 7/1/05 partially pre-refunded 7/1/00 @ 102
1,000,000     Albuquerque Water & Sewer System Revenue Refunding       Aa3/AA          1,071,750
              Series B, 6.95% due 7/1/02
585,000       Belen New Mexico Gasoline Tax Revenue Refunding &        NR/NR           598,122
              Improvement, 5.40% due 1/1/11
4,500,000     Bernalillo County Multi Family Housing Revenue Series    NR/AA-          4,794,120
              1994-A, 6.50% due 10/1/19 put 10/1/05, (Village
              Apartments Project; Insured: AXA Reinsurance Co.)
2,300,000     Bernalillo Multi Family Housing Revenue Series 1988,     NR/AA-          2,438,069
              5.80% due 11/1/25 put 11/1/06, (Sunchase Apartments
              Project; Insured: AXA Reinsurance Co.)
500,000       Bloomfield Gross Reciepts Tax Revenue Series 1992-B,     Baa/NR          517,795
              6.50% due 8/1/07
415,000       Cibola County Gross Receipts Tax Revenue, 5.70% due      Aaa/AAA         465,265
              11/1/07 (Insured: AMBAC)
495,000       Cibola County Gross Receipts Tax Revenue, 5.875% due     Aaa/AAA         559,968
              11/1/08 (Insured: AMBAC)
555,000       Cibola County Gross Receipts Tax Revenue, 6.00% due      Aaa/AAA         639,782
              11/1/10 (Insured: AMBAC)
1,000,000     Dona Ana County Gross Receipts Tax, 6.00% due 6/1/14     NR/AA           1,108,220
              (Insured: Asset Guaranty)
1,500,000     Dona Ana County Gross Receipts Tax Refunding and         NR/AA           1,654,380
              Improvement Series 1993, 5.875% due 6/1/09 (Insured:
              Asset Guaranty)
330,000       Dona Ana County Subordinated Gross Receipts Tax          NR/NR           338,408
              Revenue, 6.125% due 6/1/03
260,000       Dona Ana County Subordinated Gross Receipts Tax          NR/NR           266,885
              Revenue, 6.25% due 6/1/04
600,000       Farmington Pollution Control Revenue, 4.05% due 9/1/24   P1/A1+          600,000
              put 10/01/98 (daily demand note) (LOC: Barclays Bank)
750,000       Farmington Utility Systems Refunding Revenue, 5.20%      Aaa/AAA         768,150
              due 5/15/00 (Insured: FGIC)
800,000       Gallup New Mexico Pollution Control Revenue Refunding,   Aaa/AAA         823,840
              6.65% due 8/15/17 (Plains Electric Generation Project:
              Insured MBIA)
775,000       Gallup Pollution Control Revenue Refunding, 6.20% due    Aaa/AAA         798,064
              8/15/03 (Plains Electric Generation Project; Insured:
              MBIA)
1,500,000     Gallup Pollution Control Revenue Refunding Series        Aaa/AAA         1,544,670
              1992, 6.45% due 8/15/06 (Insured: MBIA)
500,000       Gallup Sales Tax Revenue Sinking Fund Bonds Series       Aaa/AAA         517,955
              1992-A, 6.75% due 6/1/06 (Insured: MBIA)
1,000,000     Guam Limited Obligation Highway Series 1992-A, 5.50%     Aaa/AAA         1,012,870
              due 5/1/99 (Insured: FSA)
280,000       Hidalgo County Municipal School District of Lordsburg,   NR/NR           292,698
              6.875% due 7/1/00
300,000       Hidalgo County Municipal School District of Lordsburg,   NR/NR           320,550
              6.875% due 7/1/01
315,000       Hidalgo County Municipal School District of Lordsburg,   NR/NR           342,922
              6.875% due 7/1/02
380,000       Las Cruces Gross Receipt Tax Revenue Series 1995,        A/NR            400,220
              6.00% due 6/1/01 (South Central Solid Waste Authority
              Project)
1,175,000     Las Cruces Gross Receipts Refunding Revenue, 5.45% due   A/A             1,201,414
              12/1/99
625,000       Las Cruces Gross Receipts Refunding Revenue, 5.85% due   A/A             662,687
              12/1/01
1,500,000     Las Cruces Gross Receipts Refunding Revenue Series       A/A             1,630,920
              1992, 6.25% due 12/1/05
420,000       Las Cruces Joint Utility Refunding and Improvement       A1/NR           483,748
              Revenue, 6.50% due 7/1/07
780,000       Las Cruces Joint Utility Refunding and Improvement       A1/NR           867,079
              Revenue, 6.50% due 7/1/07
1,160,000     Las Cruces Municipal Sales Tax Revenue Series 1991,      A/NR            1,229,333
              6.50% due 12/1/06
230,000       Lordsburg Gross Receipts and Lodgers Tax Revenue,        NR/NR           233,901
              8.625% due 12/1/02
1,150,000     Lordsburg Pollution Control Revenue, 6.50% due 4/1/13    A2/A            1,271,060
              (Phelps Dodge Project)
350,000       Los Alamos County Incorporated Utility Series A, 5.80%   Aaa/AAA         388,213
              due 7/1/06 (Insured: FSA)
3,445,000     Los Alamos County Utility System Revenue                 Aaa/AAA         3,803,659
              RefundingSeries A, 6.00% due 7/1/08 (Insured: FSA)
210,000       Los Lunas Industrial Development Revenue Refunding       NR/AA-          212,146
              Series A, 7.50% due 5/1/09 (Mondel Plaza Project;
              Insured: Continental Casualty)
350,000       Milan General Obligation Sanitary Sewer Series 1994,     NR/NR           390,012
              7.00% due 9/1/13
430,000       New Mexico Educational Assistance Foundation Revenue,    Aaa/NR          448,916
              6.05% due 12/1/00
140,000       New Mexico Educational Assistance Foundation Revenue,    Aaa/NR          144,736
              5.20% due 12/1/01
1,000,000     New Mexico Educational Assistance Foundation Revenue,    Aaa/NR          1,063,340
              6.20% due 12/1/01
750,000       New Mexico Educational Assistance Foundation Revenue,    A/NR            792,450
              5.50% due 11/1/03
655,000       New Mexico Educational Assistance Foundation Revenue,    Aaa/NR          713,564
              6.45% due 12/1/04
840,000       New Mexico Educational Assistance Foundation Revenue,    A/NR            888,451
              6.85% due 12/1/05
2,210,000     New Mexico Educational Assistance Foundation Revenue,    Aaa/NR          2,375,728
              6.65% due 3/1/07
25,000        New Mexico Educational Assistance Foundation Student     Aa/NR           26,194
              Loan Revenue, 5.40% due 8/1/04
2,870,000     New Mexico Educational Assistance Student Loan, 6.70%    Aaa/AAA         3,091,765
              due 4/1/02 (Insured: AMBAC)
2,605,000     New Mexico Educational Assistance Student Loan, 5.00%    Aaa/NR          2,673,772
              due 12/1/02
1,800,000     New Mexico Educational Assistance Student Loan, 6.50%    Aaa/NR          1,926,702
              due 3/1/04
140,000       New Mexico Educational Assistance Student Loan           Aaa/AAA         145,272
              Foundation Revenue Series A, 6.55% due 4/1/00
              (Insured: AMBAC)
690,000       New Mexico Educational Assistance Student Loan Series    A/NR            711,935
              2-B, 5.75% due 12/1/08
1,195,000     New Mexico Equipment Loan Council Hospital Revenue,      A3/NR           1,329,700
              7.50% due 6/1/02 (San Juan Regional Medical Center
              Inc. Project)
1,490,000     New Mexico Equipment Loan Council Hospital Revenue,      A3/NR           1,669,202
              7.80% due 6/1/05 pre-refunded 6/1/01, (San Juan
              Regional Medical Center Inc. Project)
575,000       New Mexico Equipment Loan Council Hospital Revenue,      A3/NR           644,155
              7.80% due 6/1/06 pre-refunded 6/1/01, (San Juan
              Regional Medical Center Inc. Project)
2,030,000     New Mexico Equipment Loan Council Hospital Revenue,      A3/A-           2,307,948
              6.40% due 6/1/09 (Memorial Med Center Project)
225,000       New Mexico Equipment Loan Council Hospital Revenue,      A3/NR           252,628
              7.90% due 6/1/11 pre-refunded 6/1/01, (San Juan
              Regional Medical Center Inc. Project)
700,000       New Mexico Finance Authority Revenue, 4.85% due 6/1/04   Aaa/AAA         734,951
835,000       New Mexico Finance Authority Series A, 5.90% due         Aaa/AAA         919,602
              6/1/04 (Unrefunded Balance Public Project)
780,000       New Mexico Hospital Equipment Loan, 5.60% due 6/1/02     A3/A-           823,516
              (Memorial Medical Center Project)
575,000       New Mexico Hospital Equipment Loan, 5.70% due 6/1/03     A3/A-           615,469
              (Memorial Medical Center Project)
235,000       New Mexico Hospital Equipment Loan, 5.00% due 12/1/08    Aa2/AA          248,224
              (Catholic Health Initiatives Project)
1,140,000     New Mexico Hospital Equipment Loan, 5.20% due 12/1/10    Aa2/AA          1,205,333
              (Catholic Health Initiatives Project)
955,000       New Mexico MFA MFMR Series 1991-C, 6.75% due 7/1/11      NR/AAA          957,216
              (Collateralized: FNMA)
1,375,000     New Mexico MFA MFMR Series 1991-C, 6.75% due 7/1/11      NR/AAA          1,378,080
              (Collateralized: FNMA)
1,000,000     New Mexico MFA SFMR, 5.40% due 7/1/18                    NR/AAA          1,022,780
435,000       New Mexico MFA SFMR Series 1992 A-1, 6.30% due 1/1/02    Aa1/AA          455,889
975,000       New Mexico MFA SFMR Series 1992 A-1, 6.90% due 7/1/08    NR/AAA          1,040,744
3,395,000     New Mexico MFA SFMR Series 1992-1, 6.85% due 7/1/10      Aa1/AA          3,562,645
90,000        New Mexico MFA SFMR Series A, 7.00% due 7/1/14           A1/AA           63,360
1,021,763     New Mexico MFA SFMR Series A, 0% due 7/1/15              Aa/AA           186,349
420,000       New Mexico MFA SFMR Series A-1, 6.05% due 1/1/00         Aa1/AA          428,446
415,000       New Mexico MFA SFMR Series A-1, 6.05% due 7/1/00         Aa1/AA          426,566
220,000       New Mexico MFA SFMR Series A-2, 6.20% due 1/1/01         Aa1/AA          226,787
1,000,000     New Mexico MFA SFMR Series A-3, 5.25% due 7/1/17         NR/AAA          1,023,830
125,000       New Mexico MFA SFMR Series B-2, 5.80% due 1/1/09         NR/AAA          130,891
70,000        New Mexico MFA SFMR Series C, 7.80% due 7/1/99           Aaa/AAA         71,041
              (Insured: FGIC)
360,000       New Mexico MFA SFMR Series F-2, 5.60% due 7/1/17         NR/AAA          374,123
              (Collateralized: FNMA)
130,000       New Mexico MFA SFMR Series G-2, 4.85% due 1/1/07         NR/AAA          131,756
210,000       New Mexico MFA SFMR Series G-2, 4.875% due 7/1/08        NR/AAA          213,409
170,000       New Mexico MFA SFMR Series H, 5.45% due 1/1/06           NR/AAA          178,686
              (Collateralized: FNMA/GNMA)
175,000       New Mexico MFA SFMR Series H, 5.45% due 7/1/06           NR/AAA          184,455
              (Collateralized: FNMA/GNMA)
100,000       New Mexico MFA SFMR Series PG-B-2, 5.80% due 7/1/09      NR/AAA          106,070
390,000       New Mexico State University Revenues, 5.85% due 4/1/99   A1/AA           394,859
380,000       New Mexico State University Revenues, 5.85% due 4/1/00   A1/AA           391,837
335,000       New Mexico State University Revenues, 5.85% due 4/1/01   A1/AA           351,412
300,000       New Mexico State University Revenues, 5.40% due 4/1/11   A1/AA           308,874
75,000        New Mexico Student Loan Revenue, 5.55% due 12/1/01       A/NR            77,790
2,000,000     Puerto Rico Building Authority Revenue, 6.10% due        Baa1/A          2,081,300
              7/1/00
2,000,000     Puerto Rico Electric Power Authority Power Refunding     Aaa/AAA         2,143,240
              Series F, 5.25% due 7/1/10  (when issued)
1,500,000     Puerto Rico Electric Power Revenue Refunding Series      Baa1/BBB+       1,550,880
              1992-Q, 5.70% due 7/1/00
750,000       Puerto Rico Public Improvement General Obligation,       NR/AAA          837,548
              6.60% due 7/1/04 pre-refunded 7/1/02 @ 101.5
100,000       Questa Independent School District 9 General             NR/NR           100,014
              Obligation School Bldg., 8.50% due 10/1/00
150,000       Rio Grande Natural Gas Association Natural Gas System    Baa1/BBB+       152,939
              Revenue, 5.00% due 7/1/00
375,000       Rio Rancho Gross Receipts Tax Revenue Series 1995-A,     Aaa/AAA         388,864
              5.50% due 12/1/00 (Insured: FSA)
440,000       Rio Rancho Gross Receipts Tax Revenue Series 1995-A,     Aaa/AAA         472,648
              5.50% due 12/1/03 (Insured: FSA)
500,000       Rio Rancho Water and Wastewater System, 8.00% due        Aaa/AAA         568,820
              5/15/02 (Insured: FSA)
1,000,000     Rio Rancho Water and Wastewater System, 6.50% due        Aaa/AAA         1,160,710
              5/15/06 (Insured: FSA)
1,000,000     San Juan County Central Consolidated School District     Aaa/AAA         1,067,360
              22, 5.625% due 8/15/02 (Insured: FSA)
1,000,000     San Juan Gross Receipts Gas Tax Refunding Revenue        A/NR            1,173,070
              Series B, 7.00% due 9/15/09  pre-refunded 9/15/04 @ 101
115,000       Sandoval County Gross Receipts Tax Refunding Revenue     Baa1/NR         126,807
              Series 1992, 7.00% due 11/1/07
125,000       Sandoval County Gross Receipts Tax Refunding Revenue     Baa1/NR         137,834
              Series 1992, 7.00% due 11/1/08
135,000       Sandoval County Gross Receipts Tax Refunding Revenue     Baa1/NR         148,754
              Series 1992, 7.00% due 11/1/09
145,000       Sandoval County Gross Receipts Tax Refunding Revenue     Baa1/NR         159,716
              Series 1992, 7.00% due 11/1/10
400,000       Sandoval County Landfill Revenue, 5.70% due 7/15/13      NR/NR           408,612
340,000       Santa Fe County Office and Training Facilities Project   Aaa/NR          387,005
              Revenue Series 1990, 9.00% due 7/1/01 (ETM)
356,000       Santa Fe County Office and Training Facilities Project   Aaa/NR          412,579
              Revenue Series 1990, 9.00% due 1/1/02 (ETM)
372,000       Santa Fe County Office and Training Facilities Project   Aaa/NR          439,596
              Revenue Series 1990, 9.00% due 7/1/02 (ETM)
406,000       Santa Fe County Office and Training Facilities Project   Aaa/NR          496,181
              Revenue Series 1990, 9.00% due 7/1/03 (ETM)
443,000       Santa Fe County Office and Training Facilities Project   Aaa/NR          558,636
              Revenue Series 1990, 9.00% due 7/1/04 (ETM)
626,000       Santa Fe County Office and Training Facilities Project   Aaa/NR          858,403
              Revenue Series 1990, 9.00% due 1/1/08 (ETM)
1,000,000     Santa Fe County Project Revenue Series A, 5.50% due      NR/NR           1,005,910
              5/15/15 (El Castillo Retirement Project)
170,000       Santa Fe Educational Facilities Revenue, 4.75% due       NR/BBB-         172,426
              3/1/04 (St. Johns College Project)
100,000       Santa Fe Educational Facilities Revenue, 4.85% due       NR/BBB-         101,706
              3/1/05 (St. Johns College Project)
190,000       Santa Fe Educational Facilities Revenue, 5.00% due       NR/BBB-         194,604
              3/1/06 (St. Johns College Project)
200,000       Santa Fe Educational Facilities Revenue, 5.00% due       NR/BBB-         204,544
              3/1/07 (St. Johns College Project)
210,000       Santa Fe Educational Facilities Revenue, 5.10% due       NR/BBB-         215,361
              3/1/08 (St. Johns College Project)
1,215,000     Santa Fe Educational Facilities Revenue, 5.40% due       NR/BBB-         1,234,671
              3/1/17
2,105,000     Santa Fe Gross Receipts Tax Refunding & Improvement      Aaa/AAA         2,328,909
              Series A, 6.00% due 6/1/04 (Insured: AMBAC)
1,150,000     Santa Fe Gross Receipts Tax Refunding & Improvement      Aaa/AAA         1,262,895
              Series A, 5.50% due 6/1/06 (Insured: AMBAC)
240,000       Santa Fe Housing Development Corporation Multi Family    A/NR            250,447
              Revenue Refunding Series 1993-A, 5.50% due 2/1/04
              (Villa Camino Consuelo Project)
1,900,000     Santa Fe Improvement Revenue Series 1992-A, 0% due       Aaa/AAA         1,649,086
              7/1/02 (Insured: FGIC)
1,945,000     Santa Fe Improvement Revenue Series 1992-A, 0% due       Aaa/AAA         1,606,920
              7/1/03 (Insured: FGIC)
1,945,000     Santa Fe Improvement Revenue Series 1992-A, 0% due       Aaa/AAA         1,498,039
              7/1/04 (Insured: FGIC)
1,895,000     Santa Fe Improvement Revenue Series 1992-A, 0% due       Aaa/AAA         1,358,658
              7/1/05 (Insured: FGIC)
500,000       Santa Fe Improvement Revenue Series 1992-A, 0% due       Aaa/AAA         333,590
              7/1/06 (Insured: FGIC)
1,945,000     Santa Fe Improvement Revenue Series 1992-A, 0% due       Aaa/AAA         895,303
              7/1/11 (Insured: FGIC)
1,000,000     Santa Fe Industrial Revenue Housing Refunding, 7.25%     NR/NR           1,065,860
              due 12/1/05 (Ponce de Leon Project; Guaranteed: Health
              Care REIT)
370,000       Santa Fe Refuse Disposal Systems Improvement Net         A3/NR           395,752
              Revenue Series 1996-B, 5.50% due 6/1/04
325,000       Santa Fe Refuse Disposal Systems Revenue, 5.50% due      A3/NR           344,705
              6/1/03
780,000       Santa Fe SFMR, 5.25% due 11/1/05 (Collateralized:        Aaa/NR          801,785
              FNMA/GNMA)
420,000       Santa Fe SFMR, 6.00% due 11/1/10 (Collateralized:        Aaa/NR          442,474
              FNMA/GNMA)
350,000       Santa Fe SFMR, 6.10% due 11/1/11                         Aaa/NR          375,708
675,000       Santa Fe SFMR, 6.20% due 11/1/16 (Collateralized:        Aaa/NR          724,680
              FNMA/GNMA)
442,545       Santa Fe SFMR Series 1991, 8.45% due 12/1/11 (Insured:   Aaa/NR          475,081
              FGIC)
250,000       Santa Fe Solid Waste Management Agency Facility          NR/NR           274,025
              Revenue, 5.90% due 6/1/05
875,000       Santa Fe Solid Waste Management Facilities Revenue,      NR/NR           983,876
              6.10% due 6/1/07
195,000       Santa Rosa  Consolidated  School  District 8  Guadalupe  & Baa3/NR       204,777
              San Miguel Counties GO Series 1991, 7.00% due 8/1/03
210,000       Santa Rosa  Consolidated  School  District 8  Guadalupe  & Baa3/NR       220,530 
              San Miguel Counties GO Series 1991, 7.00% due 8/1/04
285,000       Socorro Health Facility Refunding Revenue, 6.00% due     Aaa/AAA         316,626
              5/1/08 (Evangelical Lutheran Good Samaritan Project;
              Insured: AMBAC)
1,325,000     Taos County Local Hospital Gross Receipts Tax Revenue    NR/AA           1,367,546
              Series 1992, 6.125% due 12/1/01 (Insured: Asset
              Guaranty)
245,000       Torrance County Environmental Revenue Series 1992,       NR/NR           251,813
              6.875% due 6/1/03
500,000       U.S. Virgin Islands Public Finance Authority, 7.70%      NR/AAA          530,870
              due 10/1/04 pre-refunded 10/01/99 @ 102
1,000,000     U.S. Virgin Islands Public Finance Authority Revenue     NR/NR           1,092,060
              Refunding Series A, 6.90% due 10/1/01 (ETM)
330,000       U.S. Virgin Islands Public Finance Authority Series      NR/NR           369,844
              1992-A, 7.00% due 10/1/02 (ETM)
1,075,000     U.S. Virgin Islands Special Tax General Obligation       NR/NR           1,181,833
              Series 1991, 7.75% due 10/1/06 pre-refunded 10/01/01 @
              102(Hugo Insurance Claims Fund Project)
2,760,000     U.S. Virgin Islands Water & Power Authority Series A,    NR/NR           3,036,193
              7.40% due 7/1/11
100,000       University of New Mexico Higher Educational Revenue,     Aaa/AA          104,703
              7.50% due 6/1/00
1,105,000     Villa Hermosa Multi Family Housing Revenue, 5.85% due    NR/AAA          1,174,151
              11/20/16 (Collateralized: GNMA)
1,385,000     Western New Mexico University System Revenue Series      Baa2/NR         1,656,197
              1995, 7.75% due 6/15/19 pre-refunded 6/15/04

              TOTAL INVESTMENTS (Cost $144,227,271)                                $ 152,869,343

<FN>
See notes to financial statements.
</FN>
</TABLE>


Independent auditor's report


To the Board of Trustees and Shareholders
Thornburg New Mexico Intermediate Municipal Fund
Santa Fe, New Mexico

We have audited the accompanying statement of assets and liabilities,  including
the schedule of  investments,  of Thornburg  New Mexico  Intermediate  Municipal
Fund, series of Thornburg Investment Trust as of September 30, 1998, the related
statement  of  operations,  the  statement  of  changes in net  assets,  and the
financial  highlights for the periods indicated.  These financial statements and
financial  highlights  are the  responsibility  of the  Fund's  management.  Our
responsibility  is to  express  an opinion  on these  financial  statements  and
financial  highlights based on our audits. We conducted our audits in accordance
with generally accepted auditing standards. Those standards require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statements and financial highlights are free of material misstatement.  An audit
includes  examining,  on a test  basis,  evidence  supporting  the  amounts  and
disclosures in the financial statements. Our procedures included confirmation of
securities owned as of September 30, 1998, by correspondence  with the custodian
and brokers. An audit also includes assessing the accounting principles used and
significant  estimates  made by  management,  as well as evaluating  the overall
financial  statement  presentation.   We  believe  that  our  audits  provide  a
reasonable basis for our opinion. In our opinion,  the financial  statements and
financial highlights referred to above present fairly, in all material respects,
the financial position of Thornburg New Mexico Intermediate Municipal Fund as of
September 30, 1998, the results of its operations, the changes in its net assets
and the financial  highlights  for the periods  indicated,  in  conformity  with
generally accepted accounting principles.

New York, New York
October 23, 1998

Investment Manager
Thornburg Management Company, Inc.
119 East Marcy Street
Santa Fe, New Mexico  87501
(800) 847-0200

Principal Underwriter
Thornburg Securities Corporation
119 East Marcy Street
Santa Fe, New Mexico  87501
(800) 847-0200

www.thornburg.com

This report is submitted for the general  information of the shareholders of the
Fund. It is not authorized for distribution to prospective investors in the Fund
unless  preceded or  accompanied  by an  effective  prospectus,  which  includes
information  regarding the Fund's  objectives  and  policies,  experience of its
management,  marketability of shares,  and other  information.  Performance data
quoted represent past performance and do not guarantee future results.

Annual Report  September 30, 1998

Thornburg New Mexico
Intermediate Municipal Fund





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