Exhibit 23.3

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the use in this Registration Statement on Form S-1of our report dated February 29, 2016, relating to the consolidated financial statements and financial statement schedule of Great-West Life & Annuity Insurance Company and subsidiaries (the “Company”), appearing in the Annual Report on Form 10-K of the Company for the year ended December 31, 2015, and to the reference to us under the heading “Experts” in the Prospectus, which is part of this Registration Statement.

/s/ DELOITTE & TOUCHE LLP

Denver, Colorado

February 29, 2016