2001—Subsec. (a). Pub. L. 107–16 struck out “the credit for State death taxes provided by section 2011 and” before “the unified credit”.

1981—Subsec. (b)(2). Pub. L. 97–34 substituted “the amount of such value, reduced as provided in paragraph (1)” for “an amount which bears the same ratio to such value (reduced as provided in paragraph (1) of this subsection) as the aggregate amount of the marital deductions allowed under section 2056(a) bears to the aggregate amount of such marital deductions computed without regard to subsection (c) thereof”.

1976—Subsec. (a). Pub. L. 94–455, § 2001(c)(1)(B), substituted “provided by section 2011 and the unified credit provided by section 2010” for “provided by section 2011”.

Subsec. (b). Pub. L. 94–455, § 1902(a)(1)(A), added heading and substituted a comma for a dash after “deduction)” in pars. (2) and (3).

Subsec. (c). Pub. L. 94–455, § 1902(a)(1)(B), added heading.

Subsec. (d). Pub. L. 94–455, § 1902(a)(1)(C), (D), added headings for subsec. (d) and for pars. (1) and (2).

Subsec. (e). Pub. L. 94–455, § 2001(a)(3), added subsec. (e).

1970—Subsec. (b)(1). Pub. L. 91–614, § 102(d)(2)(A), substituted “the calendar quarter (or calendar year if the gift was made before January 1, 1971)” for “the year”.

Subsec. (d). Pub. L. 91–614, § 102(d)(2)(B), substituted “such quarter or year” for “such year” in two places.

Subsec. (d)(1). Pub. L. 91–614, § 102(d)(2)(A), substituted “the calendar quarter (or calendar year if the gift was made before January 1, 1971)” for “the year”.

Pub. L. 107–16, title V, § 532(d), June 7, 2001, 115 Stat. 75, provided that: “The amendments made by this section [enacting section 2058 of this title and amending this section and sections 2011, 2013 to 2016, 2053, 2056A, 2102, 2106, 2107, 2201, 2604, 6511, and 6612 of this title] shall apply to estates of decedents dying, and generation-skipping transfers, after December 31, 2004.”

Amendment by Pub. L. 97–34 applicable to estates of decedents dying after Dec. 31, 1981, but inapplicable under certain conditions under will executed before date which is 30 days after Aug. 13, 1981, or under trust created by such date, see section 403(e) of Pub. L. 97–34, set out as a note under section 2056 of this title.

Pub. L. 94–455, title XIX, § 1902(c)(1), Oct. 4, 1976, 90 Stat. 1806, as amended by Pub. L. 95–600, title VII, § 703(j)(12), Nov. 6, 1978, 92 Stat. 2942, provided that: “The amendments made by paragraphs (1) through (8), and paragraphs (12)(A), (B), and (C), of subsection (a) and by subsection (b) [amending this section and sections 2011, 2013, 2016, 2038, 2053, 2055, 2056, 2106, 2107, 2108, 2201, 6167, and 6503 of this title, repealing section 2202 of this title, and enacting provisions set out as a note under section 2201 of this title] shall apply in the case of estates of decedents dying after the date of the enactment of this Act [Oct. 4, 1976], and the amendment made by paragraph (9) of subsection (a) [amending section 2204 of this title] shall apply in the case of estates of decedents dying after December 31, 1970.”

Amendment by section 2001(a)(3), (c)(1)(B) of Pub. L. 94–455 applicable to estates of decedents dying after Dec. 31, 1976, see section 2001(d)(1) of Pub. L. 94–455, set out as a note under section 2001 of this title.

Amendment by Pub. L. 91–614 applicable with respect to gifts made after Dec. 31, 1970, see section 102(e) of Pub. L. 91–614, set out as a note under section 2501 of this title.