26 C.F.R. § 1.1402(e)(6)-1
In any case in which an individual whose death has occurred after September 12, 1960, and before April 16, 1962, derived earnings from the performance of services as a duly ordained, commissioned, or licensed minister of a church in the exercise of his ministry, as a member of a religious order (other than a member of a religious order who has taken a vow of poverty as a member of such order) in the exercise of duties required by such order, or in the exercise of his profession as a Christian Science practitioner, a waiver certificate on Form 2031 may be filed after June 30, 1961 (the date of enactment of the Social Security Amendments of 1961), and on or before April 16, 1962, by a fiduciary acting for such individual's estate or by such individual's survivor within the meaning of section 205(c)(1)(C) of the Social Security Act. Such certificates shall be effective for the period prescribed in section 1402(e)(3)(A) (see § 1.1402(e)(3) -1(c)) as if filed by the individual on the date of his death.
26 C.F.R. §1.1402(e)(6)-1