Report of Independent Registered Public
Accounting Firm

To the Board of Trustees of Thornburg Investment Trust
and Shareholders of the funds listed in
Appendix A

In planning and performing our audits of the financial
statements of the funds listed in Appendix A
(constituting Thornburg Investment Trust, hereafter
collectively referred to as the "Funds") as of and
for the year ended September 30, 2020, in accordance
with the standards of the Public Company
Accounting Oversight Board (United States) (PCAOB),
we considered the Funds' internal control
over financial reporting, including controls over
safeguarding securities, as a basis for designing our
auditing procedures for the purpose of expressing our
opinion on the financial statements and to
comply with the requirements of Form N-CEN, but not
for the purpose of expressing an opinion on
the effectiveness of the Funds' internal control over
financial reporting. Accordingly, we do not
express an opinion on the effectiveness of the Funds'
internal control over financial reporting.

The management of the Funds are responsible for
establishing and maintaining effective internal
control over financial reporting. In fulfilling this
responsibility, estimates and judgments by
management are required to assess the expected benefits
and related costs of controls. A company's
internal control over financial reporting is a process
designed to provide reasonable assurance
regarding the reliability of financial reporting and the
preparation of financial statements for
external purposes in accordance with generally accepted
accounting principles. A company's internal
control over financial reporting includes those policies
and procedures that (1) pertain to the
maintenance of records that, in reasonable detail,
accurately and fairly reflect the transactions and
dispositions of the assets of the company; (2) provide
reasonable assurance that transactions are
recorded as necessary to permit preparation of financial
statements in accordance with generally
accepted accounting principles, and that receipts and
expenditures of the company are being made
only in accordance with authorizations of management
and directors of the company; and (3)
provide reasonable assurance regarding prevention or
timely detection of unauthorized acquisition,
use or disposition of a company's assets that could have
a material effect on the financial statements.

Because of its inherent limitations, internal control over
financial reporting may not prevent or
detect misstatements. Also, projections of any evaluation
of effectiveness to future periods are
subject to the risk that controls may become inadequate
because of changes in conditions, or that the
degree of compliance with the policies or procedures
may deteriorate.

A deficiency in internal control over financial reporting
exists when the design or operation of a
control does not allow management or employees, in the
normal course of performing their assigned
functions, to prevent or detect misstatements on a timely
basis. A material weakness is a deficiency,
or a combination of deficiencies, in internal control over
financial reporting, such that there is a
reasonable possibility that a material misstatement of
the company's annual or interim financial
statements will not be prevented or detected on a timely
basis.

Our consideration of the Funds' internal control over
financial reporting was for the limited purpose
described in the first paragraph and would not
necessarily disclose all deficiencies in internal control
over financial reporting that might be material
weaknesses under standards established by the
PCAOB. However, we noted no deficiencies in the Funds'
internal control over financial reporting
and their operations, including controls over
safeguarding securities, that we consider to be material
weaknesses as defined above as of September 30, 2020.
This report is intended solely for the information and use
of the Board of Trustees of Thornburg
Investment Trust and the Securities and Exchange
Commission and is not intended to be and should
not be used by anyone other than these specified parties.

/s/ PriceWaterhouse Coopers LLP

New York, New York
November 19, 2020




Appendix A
Thornburg California Limited Term Municipal Fund
Thornburg Limited Term Municipal Fund
Thornburg Limited Term U.S. Government Fund
Thornburg New Mexico Intermediate Municipal Fund
Thornburg Intermediate Municipal Fund
Thornburg Limited Term Income Fund
Thornburg Value Fund
Thornburg New York Intermediate Municipal Fund
Thornburg International Value Fund
Thornburg Core Growth Fund
Thornburg Investment Income Builder Fund
Thornburg Global Opportunities Fund
Thornburg International Growth Fund
Thornburg Strategic Income Fund
Thornburg Strategic Municipal Income Fund
Thornburg Developing World Fund
Thornburg Ultra Short Income Fund (formerly known as
Thornburg Low Duration Income Fund)
Thornburg Short Duration Municipal Fund (formerly
known as Thornburg Low Duration Municipal
Fund)
Thornburg Capital Management Fund
Thornburg Better World International Fund
Thornburg Long/Short Equity Fund
Thornburg Summit Fund