2025—Subsec. (a). Pub. L. 119–21, § 70302(b)(1)(A)(i), substituted “a taxpayer’s foreign research or experimental expenditures” for “a taxpayer’s specified research or experimental expenditures” in introductory provisions.

Subsec. (a)(2)(B). Pub. L. 119–21, § 70302(b)(1)(A)(ii), substituted “over the 15-year period” for “over the 5-year period (15-year period in the case of any specified research or experimental expenditures which are attributable to foreign research (within the meaning of section 41(d)(4)(F)))”.

Subsec. (b). Pub. L. 119–21, § 70302(b)(1)(B), substituted “Foreign” for “Specified” in heading and “foreign research” for “specified research” in text and inserted before period at end “and which are attributable to foreign research (within the meaning of section 41(d)(4)(F))”.

Subsec. (d). Pub. L. 119–21, § 70302(b)(1)(C), substituted “foreign research or experimental expenditures” for “specified research or experimental expenditures” and inserted “or reduction to amount realized” after “no deduction”.

2017—Pub. L. 115–97 amended section generally. Prior to amendment, section consisted of subsecs. (a) to (f) relating to treatment of research and experimental expenditures as expenses, amortization of certain research and experimental expenditures, expenditure for the acquisition or improvement of land or property, ore and mineral deposit exploration expenditures, limitation to reasonable research expenditures eligible, and cross references, respectively.

2014—Subsec. (a)(2)(A). Pub. L. 113–295, § 221(a)(31), amended subpar. (A) generally. Prior to amendment, text read as follows: “A taxpayer may, without the consent of the Secretary, adopt the method provided in this subsection for his first taxable year—

“(i) which begins after December 31, 1953, and ends after August 16, 1954, and

“(ii) for which expenditures described in paragraph (1) are paid or incurred.”

Subsec. (b)(2). Pub. L. 113–295, § 221(a)(32), struck out “beginning after December 31, 1953” after “for any taxable year”.

1989—Subsecs. (e), (f). Pub. L. 101–239 added subsec. (e) and redesignated former subsec. (e) as (f).

1988—Subsec. (e)(2). Pub. L. 100–647 substituted “section 59(e)” for “section 59(d)”.

1986—Subsec. (e)(2). Pub. L. 99–514 substituted “section 59(d)” for “section 58(i)”.

1982—Subsec. (e). Pub. L. 97–248, § 201(d)(9)(B), substituted “Cross references” for “Cross reference” in heading, designated existing provisions as par. (1), and added par. (2).

1976—Subsec. (a)(2)(A). Pub. L. 94–455, § 1906(b)(13)(A), struck out “or his delegate” after “Secretary”.

Subsec. (a)(2)(A)(i). Pub. L. 94–455, § 1901(a)(30), substituted “August 16, 1954” for “the date on which this title is enacted” after “ends after”.

Subsecs. (a)(3), (b)(1), (2). Pub. L. 94–455, § 1906(b)(13)(A), struck out “or his delegate” after “Secretary”.

Amendment by Pub. L. 119–21 applicable to amounts paid or incurred in taxable years beginning after Dec. 31, 2024, except amendment by section 70302(b)(1)(C)(ii) of Pub. L. 119–21 shall apply to property disposed, retired, or abandoned after May 12, 2025, subject to election for retroactive application by certain small businesses and election to deduct certain unamortized amounts paid or incurred in taxable years beginning before Jan. 1, 2025, see section 70302(e), (f) of Pub. L. 119–21, set out as an Effective Date note under section 174A of this title.

Pub. L. 115–97, title I, § 13206(b), Dec. 22, 2017, 131 Stat. 2112, provided that: “The amendments made by subsection (a) [amending this section] shall be treated as a change in method of accounting for purposes of section 481 of the Internal Revenue Code of 1986 and—

Amendment by Pub. L. 115–97 applicable to amounts paid or incurred in taxable years beginning after Dec. 31, 2021, see section 13206(e) of Pub. L. 115–97, set out as a note under section 41 of this title.

Amendment by Pub. L. 113–295 effective Dec. 19, 2014, subject to a savings provision, see section 221(b) of Pub. L. 113–295, set out as a note under section 1 of this title.

Amendment by Pub. L. 101–239 applicable to taxable years beginning after Dec. 31, 1989, see section 7110(e) of Pub. L. 101–239, set out as a note under section 41 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 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. 97–248 applicable to taxable years beginning after Dec. 31, 1982, see section 201(e)(1) of Pub. L. 97–248, set out as a note under section 5 of this title.

For applicability of amendment by 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.

Pub. L. 97–34, title II, § 223(a), Aug. 13, 1981, 95 Stat. 249, as amended by Pub. L. 99–514, § 2, Oct. 22, 1986, 100 Stat. 2095, provided that: “In the case of the taxpayer’s first 2 taxable years beginning within 2 years after the date of the enactment of this Act [Aug. 13, 1981], all research and experimental expenditures (within the meaning of section 174 of the Internal Revenue Code of 1986 [formerly I.R.C. 1954]) which are paid or incurred in such year for research activities conducted in the United States shall be allocated or apportioned to sources within the United States.”