REPORT OF INDEPENDENT REGISTERED PUBLIC
ACCOUNTING FIRM

        To the Board of Trustees and Shareholders of
Federated Municipal Securities Income Trust:

In planning and performing our audit of the financial
statements of Federated Municipal
Securities Income Trust (the "Trust") (comprised of the
following funds: Federated California
Municipal Income Fund, Federated Michigan Intermediate
Municipal Fund, Federated New York
Municipal Income Fund, Federated North Carolina Municipal
Income Fund, Federated Ohio
Municipal Income Fund, Federated Pennsylvania Municipal
Income Fund, and Federated
Vermont Municipal Income Fund) for the year ended August 31,
2004 (on which we have issued
our reports dated October 20, 2004), we considered its internal
control, including control
activities for safeguarding securities, in order to determine
our auditing procedures for the
purpose of expressing our opinion on the financial statements and
to comply with the
requirements of Form N-SAR, and not to provide assurance on the
Trust's internal control.

The management of the Trust is responsible for establishing
and maintaining internal control.  In
fulfilling this responsibility, estimates and judgments by
management are required to assess the
expected benefits and related costs of controls.  Generally,
controls that are relevant to an audit
pertain to the entity's objective of preparing financial statements
for external purposes that are
fairly presented in conformity with accounting principles generally
accepted in the United States
of America.  Those controls include the safeguarding of assets against
unauthorized acquisition,
use, or disposition.

Because of inherent limitations in any internal control, error or
fraud may occur and not be
detected.  Also, projections of any evaluation of internal
control
to future periods are subject to
the risk that the internal control may become inadequate
because of changes in conditions or that
the effectiveness of the design and operation may deteriorate.

Our consideration of the Trust's internal control would not
necessarily disclose all matters in
internal control that might be material weaknesses under
standards established by the Public
Company Accounting Oversight Board (United States).  A material
weakness is a condition in which the design or operation of one
or more of the internal control components does not reduce
to a relatively low level the risk that misstatements due to
error or fraud in amounts that would be
material in relation to the financial statements being
audited may occur and not be detected within
a timely period by employees in the normal course of performing
their assigned functions.
However, we noted no matters involving the Trust's internal
control and
its operation, including
controls for safeguarding securities, that we consider to be
material weaknesses as defined above
as of August 31, 2004.

This report is intended solely for the information and use of
management, the Board of Trustees
and Shareholders of Federated Municipal Securities Income 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.

DELOITTE & TOUCHE LLP

Boston, Massachusetts
        October 20, 2004