1990—Subsecs. (i), (j). Pub. L. 101–508 redesignated subsec. (j) as (i) and struck out former subsec. (i) which related to deduction of certain pre-1970 exploration expenditures.
1988—Subsec. (j). Pub. L. 100–647 substituted “section 59(e)” for “section 58(i)”.
1986—Subsec. (d)(5). Pub. L. 99–514, § 413(b), added par. (5).
Subsec. (h). Pub. L. 99–514, § 411(b)(2)(B), amended subsec. (h) generally, substituting provisions relating to special rules for foreign exploration for provisions relating to limitations.
1982—Subsec. (h)(3)(B). Pub. L. 97–248, § 224(c)(8), inserted “338,” after “334(b),”.
Subsec. (j). Pub. L. 97–248, § 201(d)(9)(D), formerly § 201(c)(9)(D), added subsec. (j).
1976—Subsec. (a)(2)(A). Pub. L. 94–455, § 1906(b)(13)(A), struck out “or his delegate” after “Secretary”.
Subsec. (a)(2)(B). Pub. L. 94–455, §§ 1901(a)(89), 1906(b)(13)(A), substituted “may not be revoked unless” for “may not be revoked after the last day of the third month following the month in which the final regulations issued under the authority of this subsection are published in the Federal Register, unless”, and struck out “or his delegate” after “Secretary”.
Subsec. (b)(2)(A). Pub. L. 94–455, § 1906(b)(13)(A), struck out “or his delegate” after “Secretary”.
Subsec. (d)(1). Pub. L. 94–455, § 1901(b)(3)(K), substituted “ordinary income” for “gain from the sale or exchange of property which is neither a capital asset nor property described in section 1231”.
Subsecs. (d)(2), (e)(2), (g)(2). Pub. L. 94–455, § 1906(b)(13)(A), struck out “or his delegate” after “Secretary”.
Subsec. (h)(1). Pub. L. 94–455, § 1901(b)(21)(C), substituted “and subsection (a) of section 615 (as in effect before the enactment of the Tax Reform Act of 1976)” for “and section 615(a) and the amounts which are or have been treated as deferred expenses under section 615(b)”.
Subsec. (h)(3). Pub. L. 94–455, § 1901(b)(21)(D), struck out “and all amounts treated as deferred expenses which were paid or incurred” after “amounts deducted” in introductory provisions, redesignated subpar. (C) as (B), and in subpar. (B) as so redesignated, substituted “374(b)(1)” for “373(b)(1)”. Former subpar. (B), which related to the application of par. (2)(B) where the taxpayer would be entitled under section 381(c)(10) to deduct expenses deferred under section 615(b) had the distributor or transferor corporation elected to defer such expenses, was struck out.
Subsec. (i). Pub. L. 94–455, § 1901(b)(21)(E), added subsec. (i).
1969—Pub. L. 91–172, § 504(b)(1), substituted “Deduction and recapture of certain mining exploration expenditures” for “Additional exploration expenditures in the case of domestic mining” in heading.
Subsec. (a)(1). Pub. L. 91–172, § 504(b)(2), struck out reference to United States, the Outer Continental Shelf and the Outer Continental Shelf Lands Act from general rule dealing with allowance of deductions for expenditures in ascertaining the existence, location, extent, or quality of any deposit of ore or other mineral.
Subsec. (h). Pub. L. 91–172, § 504(b)(3), substituted provisions imposing limitations on the operation of this section for provision making cross reference to subsecs. (f) and (g) of section 615.
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 411(b)(2)(B) of Pub. L. 99–514 applicable to costs paid or incurred after
Amendment by section 413(b) of Pub. L. 99–514 applicable to any disposition of property placed in service by taxpayer after
Amendment by section 201(d)(9)(D) of Pub. L. 97–248 applicable to taxable years beginning after
Amendment by section 224(c)(8) of Pub. L. 97–248 applicable to any target corporation with respect to which the acquisition date occurs after
Amendment by section 1901(a)(89), (b)(3)(K), (21)(C)–(E) of Pub. L. 94–455 effective for taxable years beginning after
Amendment by Pub. L. 91–172 applicable with respect to exploration expenditures paid or incurred after
Pub. L. 89–570, § 3,
For provisions that nothing in amendment by Pub. L. 101–508 be construed to affect treatment of certain transactions occurring, property acquired, or items of income, loss, deduction, or credit taken into account prior to