Section 906 Certifications

I, Jonathan S. Horwitz, the Principal Executive Officer of the Funds listed on Attachment A, certify that, to my knowledge:

1. The form N-CSR of the Funds listed on Attachment A for the period ended July 31, 2015 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 Form N-CSR of the Funds listed on Attachment A for the period ended July 31, 2015 fairly presents, in all material respects, the financial condition and results of operations of the Funds listed on Attachment A.

Date: September 25, 2015

/s/ Jonathan S. Horwitz

______________________

Jonathan S. Horwitz

Principal Executive Officer

Section 906 Certifications

I, Steven D. Krichmar, the Principal Financial Officer of the Funds listed on Attachment A, certify that, to my knowledge:

1. The form N-CSR of the Funds listed on Attachment A for the period ended July 31, 2015 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 Form N-CSR of the Funds listed on Attachment A for the period ended July 31, 2015 fairly presents, in all material respects, the financial condition and results of operations of the Funds listed on Attachment A.

Date: September 25, 2015

/s/ Steven D. Krichmar

______________________

Steven D. Krichmar

Principal Financial Officer

Attachment A

N-CSR

Period (s) ended July 31, 2015

               Putnam Premier Income Trust

               Putnam Research Fund

               Putnam Investors Fund

               Putnam Voyager Fund

               Putnam Tax Free High Yield Fund

               Putnam AMT-Free Insured Municipal Fund

               Putnam Growth Opportunities Fund

               George Putnam Balanced Fund

               Putnam Short Duration Income Fund

               Putnam Short Term Investment Fund

               Putnam Strategic Volatility Equity Fund

               Putnam Low Volatility Equity Fund

               Putnam RetirementReady – Funds:

               Putnam RetirementReady – 2055

               Putnam RetirementReady – 2050

               Putnam RetirementReady – 2045

               Putnam RetirementReady – 2040

               Putnam RetirementReady – 2035

               Putnam RetirementReady – 2030

               Putnam RetirementReady – 2025

               Putnam RetirementReady – 2020

               Putnam RetirementReady – 2015

               Putnam Retirement Income Fund Lifestyle 1