26 C.F.R. § 1.801-2
Section 1.801-1 is applicable only to taxable years beginning after December 31, 1953, and before January 1, 1955, and all references to sections of part I, subchapter L, chapter 1 of the Code are to the Internal Revenue Code of 1954, before amendments. Sections 1.801-3 through 1.801-6 are applicable only to taxable years beginning after December 31, 1957, and all references to sections of part I, subchapter L, chapter 1 of the Code are to the Internal Revenue Code of 1954, as amended by the Life Insurance Company Income Tax Act of 1959 (73 Stat. 112). Section 1.801-8 is applicable only to taxable years beginning after December 31, 1961, and all references to sections of part I, subchapter L, chapter 1 of the Code are to the Internal Revenue Code of 1954, as amended by the Life Insurance Company Income Tax Act of 1959 (73 Stat. 112) and section 3 of the Act of October 23, 1962 (76 Stat. 1134).
26 C.F.R. §1.801-2