26 CFR §1.0-1

1. (a)Enactment of law. The Internal Revenue Code of 1954 which became law upon enactment of Public Law 591, 83d Congress, approved August 16, 1954, provides in part as follows:
2. (b)Scope of regulations. The regulations in this part deal with (1) the income taxes imposed under subtitle A of the Internal Revenue Code of 1954, and (2) certain administrative provisions contained in subtitle F of such Code relating to such taxes. In general, the applicability of such regulations is commensurate with the applicability of the respective provisions of the Internal Revenue Code of 1954 except that with respect to the provisions of the Internal Revenue Code of 1954 which are deemed to be included in the Internal Revenue Code of 1939, the regulations relating to such provisions are applicable to certain fiscal years and short taxable years which are subject to the Internal Revenue Code of 1939. Those provisions of the regulations which are applicable to taxable years subject to the Internal Revenue Code of 1939 and the specific taxable years to which such provisions are so applicable are identified in each instance. The regulations in 26 CFR (1939) part 39 (Regulations 118) are continued in effect until superseded by the regulations in this part. See Treasury Decision 6091, approved August 16, 1954 (19 FR 5167, C.B. 1954-2, 47).