20 CFR 404.1065 : 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) — Self-employment coverage.

For an individual to have self-employment coverage under social security, the individual must be engaged in a trade or business and have net earnings from self-employment that can be counted as self-employment income for social security purposes. The rules explaining whether you are engaged in a trade or business are in §§ 404.1066 through 404.1077. What are net earnings from self-employment is discussed in §§ 404.1080 through 404.1095. Section 404.1096 describes the net earnings from self-employment that are counted as self-employment income for social security purposes. See § 404.1913 for the effect of a totalization agreement on self-employment coverage. An agreement may exempt an activity from coverage as well as extend coverage to an activity.