Exhibit 28 (a) (13) under Form N-1A

Exhibit 3(i) under Item 601/Reg. S-K

AMENDMENT #21

TO THE RESTATED AND AMENDED

DECLARATION OF TRUST

FEDERATED INCOME SECURITIES TRUST

Dated May 19, 2000

This Declaration of Trust is amended as follows:

Strike the first paragraph of Section 5 – Establishment and Designation of Series or Class of Article III – BENEFICIAL INTEREST from the Declaration of Trust and substitute in its place the following:

"Section 5.  Establishment and Designation of Series or Class.  Without limiting the authority of the Trustees set forth in Article XII, Section 8, inter alia, to establish and designate any additional Series or Class or to modify the rights and preferences of any existing Series or Class, the Series and Classes of the Trust are established and designated as:

Federated Capital Income Fund

Class A Shares

Class B Shares

Class C Shares

Class F Shares

Federated Floating Rate Strategic Income Fund

Class A Shares

Class C Shares

Institutional Shares

Federated Fund for U. S. Government Securities

Class A Shares

Class B Shares

Class C Shares

Federated Unconstrained Bond Fund

Class A Shares

Class C Shares

Institutional Shares

Federated Intermediate Corporate Bond Fund

Institutional Service Shares

Institutional Shares

Federated Muni and Stock Advantage Fund

Class A Shares

Class B Shares

Class C Shares

Class F Shares

Federated Prudent DollarBear Fund

Class A Shares

Class C Shares

Institutional Shares

Federated Real Return Bond Fund

Class A Shares

Class C Shares

Institutional Shares

Federated Short-Term Income Fund

Class A Shares

Class Y Shares

Institutional Service Shares

Institutional Shares

The undersigned hereby certify that the above stated Amendment is a true and correct Amendment to the Declaration of Trust, as adopted by the Board of Trustees by Unanimous Consent as of the 1st day of December, 2010.

WITNESS the due execution as of the 1st day of December, 2010.

/s/ John F. Donahue	/s/ Peter E. Madden
John F. Donahue	Peter E. Madden
/s/ John T. Conroy, Jr.	/s/ Charles F. Mansfield, Jr.
John T. Conroy, Jr.	Charles F. Mansfield, Jr.
/s/ Nicholas P. Constantakis	/s/ R. James Nicholson
Nicholas P. Constantakis	R. James Nicholson
/s/ John F. Cunningham	/s/ Thomas M. O’Neill
John F. Cunningham	Thomas M. O’Neill
/s/ J. Christopher Donahue	/s/ John S. Walsh
J. Christopher Donahue	John S. Walsh
/s/ Maureen Lally-Green	/s/ James F. Will
Maureen Lally-Green	James F. Will

AMENDMENT #22

TO THE RESTATED AND AMENDED

DECLARATION OF TRUST

FEDERATED INCOME SECURITIES TRUST

Dated May 19, 2000

This Declaration of Trust is amended as follows:

Strike the first paragraph of Section 5 – Establishment and Designation of Series or Class of Article III – BENEFICIAL INTEREST from the Declaration of Trust and substitute in its place the following:

"Section 5.  Establishment and Designation of Series or Class.  Without limiting the authority of the Trustees set forth in Article XII, Section 8, inter alia, to establish and designate any additional Series or Class or to modify the rights and preferences of any existing Series or Class, the Series and Classes of the Trust are established and designated as:

Federated Capital Income Fund

Class A Shares

Class B Shares

Class C Shares

Class F Shares

Federated Floating Rate Strategic Income Fund

Class A Shares

Class C Shares

Institutional Shares

Federated Fund for U. S. Government Securities

Class A Shares

Class B Shares

Class C Shares

Federated Unconstrained Bond Fund

Class A Shares

Class C Shares

Institutional Shares

Federated Intermediate Corporate Bond Fund

Institutional Service Shares

Institutional Shares

Federated Muni and Stock Advantage Fund

Class A Shares

Class B Shares

Class C Shares

Class F Shares

Institutional Shares

Federated Prudent DollarBear Fund

Class A Shares

Class C Shares

Federated Real Return Bond Fund

Class A Shares

Class C Shares

Institutional Shares

Federated Short-Term Income Fund

Class A Shares

Class Y Shares

Institutional Service Shares

Institutional Shares

The undersigned hereby certify that the above stated Amendment is a true and correct Amendment to the Declaration of Trust, as adopted by the Board of Trustees at a meeting on the 9th day of November, 2010, to become effective on the 29th day of December, 2010.

WITNESS the due execution hereof this 9th day of November, 2010.

/s/ John F. Donahue	/s/ Peter E. Madden
John F. Donahue	Peter E. Madden
/s/ John T. Conroy, Jr.	/s/ Charles F. Mansfield, Jr.
John T. Conroy, Jr.	Charles F. Mansfield, Jr.
/s/ Nicholas P. Constantakis	/s/ R. James Nicholson
Nicholas P. Constantakis	R. James Nicholson
/s/ John F. Cunningham	/s/ Thomas M. O’Neill
John F. Cunningham	Thomas M. O’Neill
/s/ J. Christopher Donahue	/s/ John S. Walsh
J. Christopher Donahue	John S. Walsh
/s/ Maureen Lally-Green	/s/ James F. Will
Maureen Lally-Green	James F. Will

/s/ John F. Donahue	/s/ Peter E. Madden
John F. Donahue	Peter E. Madden
/s/ John T. Conroy, Jr.	/s/ Charles F. Mansfield, Jr.
John T. Conroy, Jr.	Charles F. Mansfield, Jr.
/s/ Nicholas P. Constantakis	/s/ R. James Nicholson
Nicholas P. Constantakis	R. James Nicholson
/s/ John F. Cunningham	/s/ Thomas M. O’Neill
John F. Cunningham	Thomas M. O’Neill
/s/ J. Christopher Donahue	/s/ John S. Walsh
J. Christopher Donahue	John S. Walsh
/s/ Maureen Lally-Green	/s/ James F. Will
Maureen Lally-Green	James F. Will