26 C.F.R. § 31.6109-1 Supplying of identifying numbers.
Title 26 - Internal Revenue
(a) In general. The returns, statements, and other documents required to be filed under this subchapter shall reflect such identifying numbers as are required by each return, statement, or document and its related instructions. See §301.6109–1 of this chapter (Regulations on Procedure and Administration). (b) Effective date. The provisions of this section are effective for information which must be furnished after April 15, 1974. See 26 CFR §31.6109–1 (revised as of April 1, 1973) for provisions with respect to information which must be furnished before April 16, 1974. [39 FR 9946, Mar. 15, 1974]
Title 26: Internal Revenue
PART 31—EMPLOYMENT TAXES AND COLLECTION OF INCOME TAX AT SOURCE
Subpart G—Administrative Provisions of Special Application to Employment Taxes (Selected Provisions of Subtitle F, Internal Revenue Code of 1954)
§ 31.6109-1 Supplying of identifying numbers.
