Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the attached Report of John Hancock Income Securities
Trust (the "registrant") on Form N-CSR to be filed with the Securities and
Exchange Commission (the "Report"), each of the undersigned officers of the
registrant does hereby certify that, to the best of such officer's
knowledge:

1. The Report fully complies with the requirements of Section 13(a) or
15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material
respects, the financial condition and results of operations of the
registrant as of, and for, the periods presented in the Report.


/s/ Keith F. Hartstein
------------------------------
Keith F. Hartstein
President and Chief Executive Officer

Dated:  August 29, 2005


/s/ William H. King
------------------------------
William H. King
Vice President and Treasurer

Dated:  August 29, 2005


A signed original of this written statement, required by Section 906, has
been provided to the registrant and will be retained by the registrant and
furnished to the Securities and Exchange Commission or its staff upon
request.