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T-D-A stands for the Tax-Deferred Annuity Program, which includes a traditional TDA and a Roth account option. 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. Participants in the traditional TDA option make contributions on a pre-tax basis, while participants in the Roth option make after-tax contributions. Generally, earnings grow tax-free in the accounts. Traditional TDA funds are taxable when received as income, while Roth funds are tax-free when received as a qualified withdrawal.