CLWR Clearwire Corp. - Class A (MM)

FEDERATED INCOME SECURITIES TRUST

Federated Investors Funds

4000 Ericsson Drive
Warrendale, Pennsylvania 15086-7561

June 27, 2013

EDGAR Operations Branch

U.S. Securities and Exchange Commission

Division of Investment Management

100 F Street, N.E.

Washington, DC 20549

RE: FEDERATED INCOME SECURITIES TRUST (the “Trust”)

Federated Capital Income Fund

Class R Shares

1933 Act File No. 33-3164

1940 Act File No. 811-4577  

Dear Sir or Madam:

Pursuant to Rule 497(j) of the Securities Act of 1933, the above-referenced Trust hereby certifies that the definitive form of Prospectus and Statement of Additional Information dated June 24, 2013 that would have been filed under Rule 497(c), does not differ from the form of Prospectus and Statement of Additional Information contained in the most recent Registration Statement for the Trust. This Registration Statement was electronically filed under Rule 485(b) as Post-Effective amendment No. 126 on June 25, 2013.

If you have any questions regarding this certification, please contact me at (412) 288-2614.

Very truly yours,

/s/ Andrew P. Cross

Andrew P. Cross

Assistant Secretary

Clearwire Corp. - Class A (MM) (NASDAQ:CLWR)
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