Section 403(b) and §§ 1.403(b)-2 through 1.403(b)-10 provide rules for the Federal income tax treatment of an annuity purchased for an employee by an employer that is either a tax-exempt entity under section 501(c)(3) (relating to certain religious, charitable, scientific, or other types of organizations) or a public school, or for a minister described in section 414(e)(5)(A). See section 403(a) (relating to qualified annuities) for rules regarding the taxation of an annuity purchased under a qualified annuity plan that meets the requirements of section 404(a)(2), and see section 403(c) (relating to nonqualified annuities) for rules regarding the taxation of other types of annuities.
26 C.F.R. §1.403(b)-1