26 C.F.R. § 1.1402(d)-1 Employee and wages.
Title 26 - Internal Revenue
For the purpose of the tax on self-employment income, the term “employee” and the term “wages” shall have the same meaning as when used in the Federal Insurance Contributions Act. For an explanation of these terms, see Subpart B of Part 31 of this chapter (Employment Tax Regulations).
Title 26: Internal Revenue
PART 1—INCOME TAXES
TAX ON SELF-EMPLOYMENT INCOME
§ 1.1402(d)-1 Employee and wages.