[Code of Federal Regulations] [Title 26, Volume 15] [Revised as of April 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 26CFR31.6109-1] [Page 367] TITLE 26--INTERNAL REVENUE CHAPTER I--INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY (CONTINUED) PART 31_EMPLOYMENT TAXES AND COLLECTION OF INCOME TAX AT SOURCE--Table of Contents Subpart G_Administrative Provisions of Special Application to Employment Taxes (Selected Provisions of Subtitle F, Internal Revenue Code of 1954) Sec. 31.6109-1 Supplying of identifying numbers. (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 Sec. 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 Sec. 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]