2022—Subsec. (a). Pub. L. 117–328, § 302(a), substituted “25 percent” for “50 percent”.

Subsec. (e). Pub. L. 117–328, § 302(b), added subsec. (e).

1986—Pub. L. 99–514, § 1121(a)(1), amended section generally, substituting provisions imposing an excise tax on certain accumulations in qualified retirement plans for provisions imposing an excise tax on certain accumulations in individual retirement accounts and annuities.

Subsec. (a). Pub. L. 99–514, § 1852(a)(7)(B), substituted “section 408(a)(6) or 408(b)(3)” for “section 408(a)(6) or (7), or 408(b)(3) or (4)”.

Subsec. (b). Pub. L. 99–514, § 1852(a)(7)(C), substituted “section 408(a)(6) or 408(b)(3)” for “section 408(a)(6) or (7) or 408(b)(3) or (4)”.

1978—Subsec. (c). Pub. L. 95–600 added subsec. (c).

1976—Subsec. (b). Pub. L. 94–455 struck out “or his delegate” after “Secretary”.

Pub. L. 117–328, div. T, title III, § 302(c), Dec. 29, 2022, 136 Stat. 5339, provided that: “The amendments made by this section [amending this section] shall apply to taxable years beginning after the date of the enactment of this Act [Dec. 29, 2022].”

Amendment by section 1121(a)(1) of Pub. L. 99–514 applicable to years beginning after Dec. 31, 1988, with special provisions for plans maintained pursuant to collective bargaining agreements ratified before Mar. 1, 1986, and transition rules, see section 1121(d) of Pub. L. 99–514, set out as a note under section 401 of this title.

Amendment by section 1852(a)(7)(B), (C) of Pub. L. 99–514 effective, except as otherwise provided, as if included in the provisions of the Tax Reform Act of 1984, Pub. L. 98–369, div. A, to which such amendment relates, see section 1881 of Pub. L. 99–514, set out as a note under section 48 of this title.

Pub. L. 95–600, title I, § 157(i)(2), Nov. 6, 1978, 92 Stat. 2809, provided that: “The amendment made by paragraph (1) [amending this section] shall apply to taxable years beginning after December 31, 1975.”

Section effective Jan. 1, 1975, see section 2002(i)(2) of Pub. L. 93–406, set out as an Effective Date note under section 4973 of this title.

For provisions directing that if any amendments made by subtitle A or subtitle C of title XI [§§ 1101–1147 and 1171–1177] or title XVIII [§§ 1800–1899A] of Pub. L. 99–514 require an amendment to any plan, such plan amendment shall not be required to be made before the first plan year beginning on or after Jan. 1, 1989, see section 1140 of Pub. L. 99–514, as amended, set out as a note under section 401 of this title.