1993—Subsec. (b)(1). Pub. L. 103–66 substituted “subsection (b)(5) or (c)(3)” for “subsection (b)(5)”.

1988—Subsec. (b)(1). Pub. L. 100–647 substituted “subsection (b)(5)” for “subsection (b)(5) or (d)(4)”.

1986—Subsec. (b). Pub. L. 99–514 struck out former pars. (1) and (3) which related to elections under sections 57(c) and 163(d), respectively, and redesignated former pars. (2), (4), and (5), as pars. (1), (2), and (3), respectively.

1980—Subsec. (b). Pub. L. 96–589 inserted reference to section 108(b)(5) and (d)(4).

1977—Subsec. (a)(2). Pub. L. 95–30 struck out subpar. (A) which made reference to the standard deduction provided in section 141, and redesignated subpars. (B) to (G) as (A) to (F), respectively.

1976—Subsec. (a)(2)(G). Pub. L. 94–455, § 2115(c)(2), substituted “wells” for “production subject to the provisions of section 613A(c)”.

Subsec. (b). Pub. L. 94–455, § 1901(b)(21)(F), struck out “under section 615 (relating to pre-1970 exploration expenditures),” after “of the United States, and any election”.

1975—Subsec. (a)(2)(G). Pub. L. 94–12 added subpar. (G).

1971—Subsec. (b). Pub. L. 92–178 substituted “,” for “or” after “(relating to pre-1970 exploration expenditures)” and inserted “under section 57(c) (relating to definition of net lease), or under section 163(d) (relating to limitation on interest on investment indebtedness)” after “(relating to deduction and recapture of certain mining exploration expenditures)”.

1969—Subsec. (b). Pub. L. 91–172 substituted “(relating to pre-1970 exploration expenditures) or under section 617 (relating to deduction and recapture of certain mining exploration expenditures)” for “(relating to exploration expenditures) or under section 617 (relating to additional exploration expenditures in the case of domestic mining)”.

1966—Subsec. (b). Pub. L. 89–570 provided for election under section 615 (relating to exploration expenditures) or under section 617 (relating to additional exploration expenditures in the case of domestic mining).

Amendment by Pub. L. 103–66 applicable to discharges after Dec. 31, 1992, in taxable years ending after such date, see section 13150(d) of Pub. L. 103–66, set out as a note under section 108 of this title.

Amendment by Pub. L. 100–647 effective, except as otherwise provided, as if included in the provision of the Tax Reform Act of 1986, Pub. L. 99–514, to which such amendment relates, see section 1019(a) of Pub. L. 100–647, set out as a note under section 1 of this title.

Amendment by section 511(d)(2)(B) of Pub. L. 99–514 applicable to taxable years beginning after Dec. 31, 1986, see section 511(e) of Pub. L. 99–514, set out as a note under section 163 of this title.

Amendment by section 701(e)(4)(E) of Pub. L. 99–514 applicable to taxable years beginning after Dec. 31, 1986, with certain exceptions and qualifications, see section 701(f) of Pub. L. 99–514, set out as an Effective Date note under section 55 of this title.

Amendment by Pub. L. 96–589 applicable to transactions which occur after Dec. 31, 1980, other than transactions which occur in a proceeding in a bankruptcy case or similar judicial proceeding or in a proceeding under Title 11 commencing on or after Dec. 31, 1980, with an exception permitting the debtor to make the amendment applicable to transactions occurring after Sept. 30, 1979; in a specified manner, see section 7(a)(1), (f) of Pub. L. 96–589, set out as a note under section 108 of this title.

Amendment by Pub. L. 95–30 applicable to taxable years beginning after Dec. 31, 1976, see section 106(a) of Pub. L. 95–30, set out as a note under section 1 of this title.

Amendment by section 1901(b)(21)(F) of Pub. L. 94–455 effective for taxable years beginning after Dec. 31, 1976, see section 1901(d) of Pub. L. 94–455, set out as a note under section 2 of this title.

Amendment by section 2115(c)(2) of Pub. L. 94–455 effective on Jan. 1, 1975 and applicable to taxable years ending after Dec. 31, 1974, see section 2115(f) of Pub. L. 94–455, set out as a note under section 613A of this title.

Amendment by Pub. L. 94–12 effective Jan. 1, 1975, to apply to taxable years ending after Dec. 31, 1974, see section 501(c) of Pub. L. 94–12, set out as an Effective Date note under section 613A of this title.

Amendment by Pub. L. 91–172 applicable with respect to exploration expenditures paid or incurred after Dec. 31, 1969, see section 504(d)(1) of Pub. L. 91–172, set out as an Effective Date note under section 243 of this title.

Amendment by Pub. L. 89–570 applicable to taxable years ending after Sept. 12, 1966, but only in respect of expenditures paid or incurred after such date, see section 3 of Pub. L. 89–570, set out as an Effective Date note under section 617 of this title.

For applicability of amendment by section 701(e)(4)(E) of Pub. L. 99–514 notwithstanding any treaty obligation of the United States in effect on Oct. 22, 1986, with provision that for such purposes any amendment by title I of Pub. L. 100–647 be treated as if it had been included in the provision of Pub. L. 99–514 to which such amendment relates, see section 1012(aa)(2), (4) of Pub. L. 100–647, set out as a note under section 861 of this title.