T-D-A stands for the Tax-Deferred Annuity Program. This defined-contribution program, established under Section 403(b) of the Internal Revenue Code, provides TRS members with the opportunity to save additional funds for retirement on a tax-deferred basis. Contributions and the investment return they earn can grow quickly because taxes are deferred until the member receives the funds. For more information, you may refer to TRS'
Your Tax-Deferred Annuity Program booklet.