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Tax-deferred annuity (TDA) plans, are a type of 403(b) plan to which employees can voluntarily elect to make pre-tax contributions. TDA plans are not subject to the minimum coverage and other nondiscrimination tests that apply to most retirement plans. If an employer makes a TDA plan available to some of its employees, however, the employer must generally make it available to all non-excludable employees. For this purpose, certain part-time, union, and student employees may be excluded. (See Keeping Your Plan In Shape, TIAA-CREF's nondiscrimination guide for more details on excludable/non-excludable rules that apply to various types of retirement plans.)

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