CERTIFICATION UNDER SECTION 906 OF SARBANES-OXLEY ACT OF 2002 (18 U.S.C. 1350) In connection with the Semiannual Report of Great-West Variable Annuity Account A (the "Registrant") on Form N-CSR for the period ended June 30, 2003 (the "Report"), the undersigneds hereby certify, to the best of their knowledge, that: 1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; 2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant. Date: August 15, 2003 By: /s/ W.T. McCallum ------------------- W.T. McCallum Chairman of the Committee Date: August 15, 2003 By: /s/ G. McDonald ------------------- G. McDonald Treasurer