20 CFR 404.1070 : Employees' Benefits (§ 1.1 To Parts 1011-1099) — (Part 400 To Part 499) — Social Security Administration (Part 400 To Part 499) — Federal Old-Age, Survivors And Disability Insurance (1950- ) (§ 404.1 To § 404.2127) — Employment, Wages, Self-Employment, And Self-Employment Income (§ 404.1001 To § 404.1096) — Self-Employment (§ 404.1065 To § 404.1077) — Christian Science practitioners.

If you are a Christian Science practitioner, the services you perform in the exercise of your profession are a trade or business unless you were granted an exemption from coverage under section 1402(e) of the Code, and you did not revoke such exemption in accordance with section 1704(b) of the Tax Reform Act of 1986. An exemption cannot be granted if you filed a valid waiver certificate under the provisions that apply to taxable years ending before 1968.