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 of Thornburg Investment Trust,
hereafter collectively referred to as the "Funds") as
of and for the period ended September 30, 2019, 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, 2019.

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/PricewaterhouseCoopers LLP
New York, New York
November 22, 2019








































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 Low Duration Income Fund
Thornburg Low Duration Municipal Fund
Thornburg Capital Management Fund
Thornburg Better World International Fund
Thornburg Long/Short Equity Fund
Thornburg Summit Fund