497

Federated Municipal Securities Fund, Inc. (“Fund”)

Class A Shares (“Classes”)

Class B Shares

Class C Shares

Class F Shares

This Rule 497(e) filing is submitted for the sole purpose of submitting the XBRL Interactive Data File exhibits for the revised Risk/Return Summary of the above-named Fund and Classes.  This Interactive Data File relates to, and incorporates by reference, the supplement to the Prospectus for the Fund and Classes filed pursuant to Rule 497(e) on April 10, 2017, Accession No. 0001623632-17-000768. The exhibits filed herewith do not constitute the complete publicly filed disclosure for the Fund and its Classes, and should be used in conjunction with the complete prospectus for the Fund and its Classes, as revised.

Exhibit List for Interactive Data File Submissions.

EX-101.INS	INSTANCE
EX-101.SCH	SCHEMA
EX-101.DEF	DEFINITION LINKBASE
EX-101.LAB	LABEL LINKBASE
EX-101.PRE	PRESENTATION LINKBASE

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	Other
Document Period End Date	dei_DocumentPeriodEndDate	Mar. 31, 2016
Registrant Name	dei_EntityRegistrantName	FEDERATED MUNICIPAL SECURITIES FUND INC
Central Index Key	dei_EntityCentralIndexKey	0000201801
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Apr. 10, 2017
Document Effective Date	dei_DocumentEffectiveDate	Apr. 10, 2017
Prospectus Date	rr_ProspectusDate	May 31, 2016

XML

May 31, 2016

IMPORTANT INFORMATION REGARDING THE FEDERATED FUNDS

SUPPLEMENT TO CURRENT PROSPECTUSES

1. Under the section entitled "Fund Summary Information," please add the following as the final sentence to the "Risk/Return Summary: Fees and Expenses" introductory paragraph:                                                 

"More information about these and other discounts is available from your financial professional, in the "What Do Shares Cost?" section of the Prospectus and in "Appendix B" to this Prospectus."

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	FEDERATED MUNICIPAL SECURITIES FUND INC
Prospectus Date	rr_ProspectusDate	May 31, 2016
Supplement [Text Block]	fmsfi_SupplementTextBlock	IMPORTANT INFORMATION REGARDING THE FEDERATED FUNDS SUPPLEMENT TO CURRENT PROSPECTUSES 1. Under the section entitled "Fund Summary Information," please add the following as the final sentence to the "Risk/Return Summary: Fees and Expenses" introductory paragraph:                                                  "More information about these and other discounts is available from your financial professional, in the "What Do Shares Cost?" section of the Prospectus and in "Appendix B" to this Prospectus."
FEDERATED MUNICIPAL SECURITIES FUND INC
Risk/Return:	rr_RiskReturnAbstract
Supplement [Text Block]	fmsfi_SupplementTextBlock	IMPORTANT INFORMATION REGARDING THE FEDERATED FUNDS SUPPLEMENT TO CURRENT PROSPECTUSES 1. Under the section entitled "Fund Summary Information," please add the following as the final sentence to the "Risk/Return Summary: Fees and Expenses" introductory paragraph:                                                  "More information about these and other discounts is available from your financial professional, in the "What Do Shares Cost?" section of the Prospectus and in "Appendix B" to this Prospectus."

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	FEDERATED MUNICIPAL SECURITIES FUND INC
Prospectus Date	rr_ProspectusDate	May 31, 2016
Document Creation Date	dei_DocumentCreationDate	Apr. 10, 2017