<SEC-DOCUMENT>0000940400-17-000265-index.html : 20170426
<SEC-HEADER>0000940400-17-000265.hdr.sgml : 20170426
<ACCEPTANCE-DATETIME>20170426150028
ACCESSION NUMBER:		0000940400-17-000265
CONFORMED SUBMISSION TYPE:	NSAR-A
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20170228
FILED AS OF DATE:		20170426
DATE AS OF CHANGE:		20170426
EFFECTIVENESS DATE:		20170426

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FEDERATED MUNICIPAL SECURITIES INCOME TRUST
		CENTRAL INDEX KEY:			0000866700
		IRS NUMBER:				251695291
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			0831

	FILING VALUES:
		FORM TYPE:		NSAR-A
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-06165
		FILM NUMBER:		17783846

	BUSINESS ADDRESS:	
		STREET 1:		4000 ERICSSON DRIVE
		CITY:			WARRENDALE
		STATE:			PA
		ZIP:			15086-7561
		BUSINESS PHONE:		8003417400

	MAIL ADDRESS:	
		STREET 1:		4000 ERICSSON DRIVE
		CITY:			WARRENDALE
		STATE:			PA
		ZIP:			15086-7561

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MUNICIPAL SECURITIES INCOME TRUST
		DATE OF NAME CHANGE:	19921023

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FEDERATED MUNICIPAL INCOME TRUST
		DATE OF NAME CHANGE:	19920703
<SERIES-AND-CLASSES-CONTRACTS-DATA>
<EXISTING-SERIES-AND-CLASSES-CONTRACTS>
<SERIES>
<OWNER-CIK>0000866700
<SERIES-ID>S000009090
<SERIES-NAME>Federated Michigan Intermediate Municipal Trust
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024699
<CLASS-CONTRACT-NAME>Class A Shares
<CLASS-CONTRACT-TICKER-SYMBOL>MMIFX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000866700
<SERIES-ID>S000009091
<SERIES-NAME>Federated New York Municipal Income Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024700
<CLASS-CONTRACT-NAME>Class A Shares
<CLASS-CONTRACT-TICKER-SYMBOL>NYIFX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024701
<CLASS-CONTRACT-NAME>Class B Shares
<CLASS-CONTRACT-TICKER-SYMBOL>NYIBX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000866700
<SERIES-ID>S000009093
<SERIES-NAME>Federated Ohio Municipal Income Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024703
<CLASS-CONTRACT-NAME>Class F Shares
<CLASS-CONTRACT-TICKER-SYMBOL>OMIFX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000070760
<CLASS-CONTRACT-NAME>Class A Shares
<CLASS-CONTRACT-TICKER-SYMBOL>OMIAX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000866700
<SERIES-ID>S000009094
<SERIES-NAME>Federated Pennsylvania Municipal Income Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024704
<CLASS-CONTRACT-NAME>Class A Shares
<CLASS-CONTRACT-TICKER-SYMBOL>PAMFX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024705
<CLASS-CONTRACT-NAME>Class B Shares
<CLASS-CONTRACT-TICKER-SYMBOL>FPABX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000188345
<CLASS-CONTRACT-NAME>Class T Shares
<CLASS-CONTRACT-TICKER-SYMBOL>FPATX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000866700
<SERIES-ID>S000012747
<SERIES-NAME>Federated Municipal High Yield Advantage Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000034361
<CLASS-CONTRACT-NAME>Class A Shares
<CLASS-CONTRACT-TICKER-SYMBOL>FMOAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000034362
<CLASS-CONTRACT-NAME>Class B Shares
<CLASS-CONTRACT-TICKER-SYMBOL>FMOBX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000034363
<CLASS-CONTRACT-NAME>Class C Shares
<CLASS-CONTRACT-TICKER-SYMBOL>FMNCX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000034364
<CLASS-CONTRACT-NAME>Class F Shares
<CLASS-CONTRACT-TICKER-SYMBOL>FHTFX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000130166
<CLASS-CONTRACT-NAME>Institutional Shares
<CLASS-CONTRACT-TICKER-SYMBOL>FMYIX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000188346
<CLASS-CONTRACT-NAME>Class T Shares
<CLASS-CONTRACT-TICKER-SYMBOL>FMYTX
</CLASS-CONTRACT>
</SERIES>
</EXISTING-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>NSAR-A
<SEQUENCE>1
<FILENAME>fmsit.fil
<TEXT>
Document 1 - file: fmsit.fil

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.77Q1 OTHR EXHB
<SEQUENCE>2
<FILENAME>fmsit77q1.txt
<TEXT>
Document 2 - file: fmsit77q1.txt

</DOCUMENT>
</SEC-DOCUMENT>