Except as otherwise provided in any section of this title—

Effective with respect to taxable years ending after March 31, 1954, and subject to tax under chapter 1 of the Internal Revenue Code of 1939—

(A) Chapters 1, 2, and 6 of this title shall apply only with respect to taxable years beginning after December 31, 1953, and ending after the date of enactment of this title, and with respect to such taxable years, chapters 1 (except sections 143 and 144) and 2, and section 3801, of the Internal Revenue Code of 1939 are hereby repealed.

(B) Chapter 3 of this title shall apply with respect to payments and transfers occurring after December 31, 1954, and as to such payments and transfers sections 143 and 144 and chapter 7 of the Internal Revenue Code of 1939 are hereby repealed.

(C) Any provision of subtitle A of this title the applicability of which is stated in terms of a specific date (occurring after December 31, 1953), or in terms of taxable years ending after a specific date (occurring after December 31, 1953), shall apply to taxable years ending after such specific date. Each such provision shall, in the case of a taxable year subject to the Internal Revenue Code of 1939, be deemed to be included in the Internal Revenue Code of 1939, but shall be applicable only to taxable years ending after such specific date. The provisions of the Internal Revenue Code of 1939 superseded by provisions of subtitle A of this title the applicability of which is stated in terms of a specific date (occurring after December 31, 1953) shall be deemed to be included in subtitle A of this title, but shall be applicable only to the period prior to the taking effect of the corresponding provision of subtitle A.

(D) Effective with respect to taxable years ending after March 31, 1954, and subject to tax under chapter 1 of the Internal Revenue Code of 1939— (i) Sections 13(b)(3), 26(b)(2)(C), 26(h) (1)(C) (including the comma and the word “and” immediately preceding such section), 26(i)(3), 108(k), 207(a)(1)(C), 207(a)(3)(C), and the last sentence of section 362(b)(3) of such Code are hereby repealed; and (ii) Sections 13(b)(2), 26(b)(2)(B), 26(h) (1)(B), 26(i)(2), 207(a)(1)(B), 207(a)(3)(B), 421(a)(1)(B), and the second sentence of section 362(b)(3) of such Code are hereby amended by striking out “and before April 1, 1954” (and any accompanying punctuation) wherever appearing therein.

Chapter 11 of this title shall apply with respect to estates of decedents dying after the date of enactment of this title, and with respect to such estates chapter 3 of the Internal Revenue Code of 1939 is hereby repealed.

(A) Chapter 11 of this title shall apply with respect to estates of decedents dying after the date of enactment of this title, and with respect to such estates chapter 3 of the Internal Revenue Code of 1939 is hereby repealed.

(B) Chapter 12 of this title shall apply with respect to the calendar year 1955 and all calendar years thereafter, and with respect to such years chapter 4 of the Internal Revenue Code of 1939 is hereby repealed.

(3) Subtitle C Subtitle C of this title shall apply only with respect to remuneration paid after December 31, 1954, except that chapter 22 of such subtitle shall apply only with respect to remuneration paid after December 31, 1954, which is for services performed after such date. Chapter 9 of the Internal Revenue Code of 1939 is hereby repealed with respect to remuneration paid after December 31, 1954, except that subchapter B of such chapter (and subchapter E of such chapter to the extent it relates to subchapter B) shall remain in force and effect with respect to remuneration paid after December 31, 1954, for services performed on or before such date.

(4) Subtitle D Subtitle D of this title shall take effect on January 1, 1955. Subtitles B and C of the Internal Revenue Code of 1939 (except chapters 7, 9, 15, 26, and 28, subchapter B of chapter 25, and parts VII and VIII of subchapter A of chapter 27 of such code) are hereby repealed effective January 1, 1955. Provisions having the same effect as section 6416(b)(2)(H),[1] and so much of section 4082(c)  as refers to special motor fuels, shall be considered to be included in the Internal Revenue Code of 1939 effective as of May 1, 1954. Section 2450(a) of the Internal Revenue Code of 1939 (as amended by the Excise Tax Reduction Act of 1954) applies to the period beginning on April 1, 1954, and ending on December 31, 1954.

(5) Subtitle E Subtitle E shall take effect on January 1, 1955, except that the provisions in section 5411 permitting the use of a brewery under regulations prescribed by the Secretary for the purpose of producing and bottling soft drinks, section 5554, and chapter 53 shall take effect on the day after the date of enactment of this title. Subchapter B of chapter 25, and part VIII of subchapter A of chapter 27, of the Internal Revenue Code of 1939 are hereby repealed effective on the day after the date of enactment of this title. Chapters 15 and 26, and part VII of subchapter A of chapter 27, of the Internal Revenue Code of 1939 are hereby repealed effective January 1, 1955.

After the date of enactment of this title, the following provisions of subtitle F shall apply to the taxes imposed by the Internal Revenue Code of 1939, notwithstanding any contrary provisions of such code:

(A) General rule The provisions of subtitle F shall take effect on the day after the date of enactment of this title and shall be applicable with respect to any tax imposed by this title. The provisions of subtitle F shall apply with respect to any tax imposed by the Internal Revenue Code of 1939 only to the extent provided in subparagraphs (B) and (C) of this paragraph.

(B) Assessment, collection, and refunds Notwithstanding the provisions of subparagraph (A), and notwithstanding any contrary provision of subchapter A of chapter 63 (relating to assessment), chapter 64 (relating to collection), or chapter 65 (relating to abatements, credits, and refunds) of this title, the provisions of part II of subchapter A of chapter 28 and chapters 35, 36, and 37 (except section 3777) of subtitle D of the Internal Revenue Code of 1939 shall remain in effect until January 1, 1955, and shall also be applicable to the taxes imposed by this title. On and after January 1, 1955, the provisions of subchapter A of chapter 63, chapter 64, and chapter 65 (except section 6405) of this title shall be applicable to all internal revenue taxes (whether imposed by this title or by the Internal Revenue Code of 1939), notwithstanding any contrary provision of part II of subchapter A of chapter 28, or of chapter 35, 36, or 37, of the Internal Revenue Code of 1939. The provisions of section 6405 (relating to reports of refunds and credits) shall be applicable with respect to refunds or credits allowed after the date of enactment of this title, and section 3777 of the Internal Revenue Code of 1939 is hereby repealed with respect to such refunds and credits.

(C) Taxes imposed under the 1939 CodeAfter the date of enactment of this title, the following provisions of subtitle F shall apply to the taxes imposed by the Internal Revenue Code of 1939, notwithstanding any contrary provisions of such code: (i) Chapter 73, relating to bonds. (ii) Chapter 74, relating to closing agreements and compromises. (iii) Chapter 75, relating to crimes and other offenses, but only insofar as it relates to offenses committed after the date of enactment of this title, and in the case of such offenses, section 6531, relating to periods of limitation on criminal prosecution, shall be applicable. The penalties (other than penalties which may be assessed) provided by the Internal Revenue Code of 1939 shall not apply to offenses, committed after the date of enactment of this title, to which chapter 75 of this title is applicable. (iv) Chapter 76, relating to judicial proceedings. (v) Chapter 77, relating to miscellaneous provisions, except that section 7502 shall apply only if the mailing occurs after the date of enactment of this title, and section 7503 shall apply only if the last date referred to therein occurs after the date of enactment of this title. (vi) Chapter 78, relating to discovery of liability and enforcement of title. (vii) Chapter 79, relating to definitions. (viii) Chapter 80, relating to application of internal revenue laws, effective date, and related provisions.

(D) Chapter 28 and subtitle D of 1939 Code Except as otherwise provided in subparagraphs (B) and (C), the provisions of chapter 28 and of subtitle D of the Internal Revenue Code of 1939 shall remain in effect with respect to taxes imposed by the Internal Revenue Code of 1939.

(7) Other provisions If the effective date of any provision of the Internal Revenue Code of 1986 is not otherwise provided in this section or in any other section of this title, such provision shall take effect on the day after the date of enactment of this title. If the repeal of any provision of the Internal Revenue Code of 1939 is not otherwise provided by this section or by any other section of this title, such provision is hereby repealed effective on the day after the date of enactment of this title.

The repeal of any provision of the Internal Revenue Code of 1939 shall not abolish, terminate, or otherwise change—

(1) Existing rights and liabilities The repeal of any provision of the Internal Revenue Code of 1939 shall not affect any act done or any right accruing or accrued, or any suit or proceeding had or commenced in any civil cause, before such repeal; but all rights and liabilities under such code shall continue, and may be enforced in the same manner, as if such repeal had not been made.

The repeal of any provision of the Internal Revenue Code of 1939 shall not abolish, terminate, or otherwise change—

(A) any internal revenue district,

(B) any office, position, board, or committee, or

(C) the appointment or employment of any officer or employee,

(3) Existing delegations of authority Any delegation of authority made pursuant to the provisions of Reorganization Plan Numbered 26 of 1950 or Reorganization Plan Numbered 1 of 1952, including any redelegation of authority made pursuant to any such delegation of authority, and in effect under the Internal Revenue Code of 1939 immediately preceding the enactment of this title shall, notwithstanding the repeal of such code, remain in effect for purposes of this title, unless distinctly inconsistent or manifestly incompatible with the provisions of this title. The preceding sentence shall not be construed as limiting in any manner the power to amend, modify, or revoke any such delegation or redelegation of authority.

All offenses committed, and all penalties or forfeitures incurred, under any provision of law hereby repealed, may be prosecuted and punished in the same manner and with the same effect as if this title had not been enacted.

All periods of limitation, whether applicable to civil causes and proceedings, or to the prosecution of offenses, or for the recovery of penalties or forfeitures, hereby repealed shall not be affected thereby, but all suits, proceedings, or prosecutions, whether civil or criminal, for causes arising, or acts done or committed, prior to said repeal, may be commenced and prosecuted within the same time as if this title had not been enacted.

For the purpose of applying the Internal Revenue Code of 1939 or the Internal Revenue Code of 1986 to any period, any reference in either such code to another provision of the Internal Revenue Code of 1939 or the Internal Revenue Code of 1986 which is not then applicable to such period shall be deemed a reference to the corresponding provision of the other code which is then applicable to such period.

(Aug. 16, 1954, ch. 736, 68A Stat. 919; Pub. L. 94–455, title XIX, § 1906(b)(13)(A), Oct. 4, 1976, 90 Stat. 1834; Pub. L. 99–514, § 2, Oct. 22, 1986, 100 Stat. 2095; Pub. L. 115–141, div. U, title IV, § 401(a)(335), (336), Mar. 23, 2018, 132 Stat. 1200.)