Sections 505(b), (i) and 526 of the Federal Food, Drug, and Cosmetic Act, referred to in subsecs. (b)(2)(A) and (d)(1), (2)(B), are classified to sections 355(b), (i) and 360bb, respectively, of Title 21, Food and Drugs.

Section 351 of the Public Health Service Act, referred to in subsec. (b)(2)(A)(ii)(II), is classified to section 262 of Title 42, The Public Health and Welfare.

2018—Subsec. (b)(2)(A)(ii)(II). Pub. L. 115–141, § 401(a)(17), substituted “, and” for “; and”.

Subsec. (d)(2). Pub. L. 115–141, § 401(d)(1)(D)(iii), struck out subpar. (A) designation and heading, redesignated cls. (i) and (ii) of former subpar. (A) as subpars. (A) and (B), respectively, realigned margins, and struck out former subpar. (B) which related to special limitation for corporations to which former section 936 applied.

2017—Subsec. (a). Pub. L. 115–97 substituted “25 percent” for “50 percent”.

2015—Subsec. (b)(1)(D). Pub. L. 114–113 struck out subpar. (D). Text read as follows: “If section 41 is not in effect for any period, such section shall be deemed to remain in effect for such period for purposes of this paragraph.”

2014—Subsec. (b)(1)(D). Pub. L. 113–295 amended subpar. (D) generally. Prior to amendment, text read as follows: “For purposes of this paragraph, section 41 shall be deemed to remain in effect for periods after June 30, 1995, and before July 1, 1996, and periods after December 31, 2013.”

2013—Subsec. (b)(1)(D). Pub. L. 112–240 substituted “December 31, 2013” for “December 31, 2011”.

2010—Subsec. (b)(1)(D). Pub. L. 111–312 substituted “December 31, 2011” for “December 31, 2009”.

2008—Subsec. (b)(1)(D). Pub. L. 110–343 substituted “December 31, 2009” for “December 31, 2007”.

2006—Subsec. (b)(1)(D). Pub. L. 109–432 substituted “2007” for “2005”.

2004—Subsec. (b)(1)(D). Pub. L. 108–311 substituted “December 31, 2005” for “June 30, 2004”.

1999—Subsec. (b)(1)(D). Pub. L. 106–170 substituted “June 30, 2004” for “June 30, 1999”.

1998—Subsec. (b)(1)(D). Pub. L. 105–277 substituted “June 30, 1999” for “June 30, 1998”.

1997—Subsec. (b)(1)(D). Pub. L. 105–34, § 601(b)(2), substituted “June 30, 1998” for “May 31, 1997”.

Subsec. (b)(2)(A)(ii)(II). Pub. L. 105–115 struck out “or 507” after “505(b)”.

Subsec. (e). Pub. L. 105–34, § 604(a), struck out subsec. (e) which read as follows:

“(e) Termination.—This section shall not apply to any amount paid or incurred—

“(1) after December 31, 1994, and before July 1, 1996, or

“(2) after May 31, 1997.”

1996—Pub. L. 104–188, § 1205(a)(1), renumbered section 28 of this title as this section.

Subsec. (a). Pub. L. 104–188, § 1205(d)(1), substituted “For purposes of section 38, the credit determined under this section for the taxable year is” for “There shall be allowed as a credit against the tax imposed by this chapter for the taxable year”.

Subsec. (b)(1)(D). Pub. L. 104–188, § 1204(e), inserted “, and before July 1, 1996, and periods after May 31, 1997” after “June 30, 1995”.

Subsec. (d)(2) to (5). Pub. L. 104–188, § 1205(d)(2), redesignated pars. (3) to (5) as (2) to (4), respectively, and struck out former par. (2) which read as follows: “Limitation based on amount of tax.—The credit allowed by this section for any taxable year shall not exceed the excess (if any) of—

“(A) the regular tax (reduced by the sum of the credits allowable under subpart A and section 27), over

“(B) the tentative minimum tax for the taxable year.”

Subsec. (e). Pub. L. 104–188, § 1205(b), amended subsec. (e) generally. Prior to amendment, subsec. (e) read as follows: “Termination.—This section shall not apply to any amount paid or incurred after December 31, 1994.”

1993—Subsec. (b)(1)(D). Pub. L. 103–66, § 13111(a)(2), substituted “June 30, 1995” for “June 30, 1992”.

Subsec. (e). Pub. L. 103–66, § 13111(b), substituted “December 31, 1994” for “June 30, 1992”.

1991—Subsec. (b)(1)(D). Pub. L. 102–227, § 102(b), substituted “June 30, 1992” for “December 31, 1991”.

Subsec. (e). Pub. L. 102–227, § 111(a), substituted “June 30, 1992” for “December 31, 1991”.

1990—Subsec. (b)(1)(D). Pub. L. 101–508, § 11402(b)(2), substituted “December 31, 1991” for “December 31, 1990”.

Subsec. (e). Pub. L. 101–508, § 11411, substituted “December 31, 1991” for “December 31, 1990”.

1989—Subsec. (b)(1)(D). Pub. L. 101–239 substituted “1990” for “1989”.

1988—Subsec. (b)(1)(D). Pub. L. 100–647, § 4008(c)(1), substituted “1989” for “1988”.

Subsec. (b)(2)(A)(ii)(II). Pub. L. 100–647, § 1018(q)(1), amended subcl. (II) generally. Prior to amendment, subcl. (II) read as follows: “before the date on which an application with respect to such drug is approved under section 505(b) of such Act or, if the drug is a biological product, before the date on which a license for such drug is issued under section 351 of the Public Health Services Act, and”.

1986—Subsec. (b)(1). Pub. L. 99–514, § 231(d)(3)(A)(i), (iv), substituted “41” for “30” in subpars. (A), (B), and (D), and substituted “1988” for “1985” in subpar. (D).

Subsec. (b)(2)(A)(ii)(I). Pub. L. 99–514, § 1879(b)(1)(A), substituted “the date such drug” for “the date of such drug”.

Subsec. (b)(2)(A)(ii)(II). Pub. L. 99–514, § 1879(b)(1)(B), inserted “or, if the drug is a biological product, before the date on which a license for such drug is issued under section 351 of the Public Health Services Act”.

Subsec. (c). Pub. L. 99–514, § 231(d)(3)(A)(i), (ii), substituted “41” for “30” in pars. (1) and (2) and “41(b)” for “30(b)” in par. (2).

Subsec. (d)(1). Pub. L. 99–514, § 1879(b)(2), amended par. (1) generally. Prior to amendment, par. (1) read as follows: “For purposes of this section, the term ‘rare disease or condition’ means any disease or condition which occurs so infrequently in the United States that there is no reasonable expectation that the cost of developing and making available in the United States a drug for such disease or condition will be recovered from sales in the United States of such drug. Determinations under the preceding sentence with respect to any drug shall be made on the basis of the facts and circumstances as of the date such drug is designated under section 526 of the Federal Food, Drug, and Cosmetic Act.”

Subsec. (d)(2). Pub. L. 99–514, § 701(c)(2), amended par. (2) generally. Prior to amendment, par. (2) read as follows: “The credit allowed by this section for any taxable year shall not exceed the taxpayer’s tax liability for the taxable year (as defined in section 26(b)), reduced by the sum of the credits allowable under subpart A and section 27.”

Subsec. (d)(3)(B). Pub. L. 99–514, § 1275(c)(4), struck out “934(b) or” before “936” in heading and amended text generally. Prior to amendment, text read as follows: “No credit shall be allowed under this section with respect to any clinical testing conducted by a corporation to which section 934(b) applies or to which an election under section 936 applies.”

Subsec. (d)(4). Pub. L. 99–514, § 231(d)(3)(A)(iii), substituted “section 41(f)” for “section 30(f)”.

Subsec. (e). Pub. L. 99–514, § 232, substituted “1990” for “1987”.

1984—Pub. L. 98–369, § 471(c), renumbered section 44H of this title as this section.

Subsec. (b)(1)(A), (B), (D). Pub. L. 98–369, § 474(g)(1)(A), substituted “section 30” for “section 44F”.

Subsec. (c)(1). Pub. L. 98–369, § 474(g)(1)(A), substituted “section 30” for “section 44F”.

Subsec. (c)(2). Pub. L. 98–369, § 474(g)(1)(A), (B), substituted “section 30” for “section 44F” and “section 30(b)” for “section 44F(b)”.

Subsec. (d)(2). Pub. L. 98–369, § 612(e)(1), substituted “section 26(b)” for “section 25(b)”.

Pub. L. 98–369, § 474(g)(2), amended par. (2) generally, substituting “shall not exceed the taxpayer’s tax liability for the taxable year (as defined in section 25(b), reduced by the sum of the credits allowable under subpart A and section 27” for “shall not exceed the amount of the tax imposed by this chapter for the taxable year reduced by the sum of the credits allowable under a section of this subpart having a lower number or letter designation than this section, other than the credits allowable by sections 31, 39, and 43. For purposes of the preceding sentence, the term ‘tax imposed by this chapter’ shall not include any tax treated as not imposed by this chapter under the last sentence of section 53(a)”.

Subsec. (d)(4). Pub. L. 98–369, § 474(g)(1)(C), substituted “section 30(f)” for “section 44F(f)”.

Pub. L. 115–97, title I, § 13401(c), Dec. 22, 2017, 131 Stat. 2134, provided that: “The amendments made by this section [amending this section and section 280C of this title] shall apply to taxable years beginning after December 31, 2017.”

Amendment by Pub. L. 114–113 applicable to amounts paid or incurred after Dec. 31, 2014, see section 121(d)(1) of Pub. L. 114–113, set out as a note under section 38 of this title.

Amendment by Pub. L. 113–295 applicable to amounts paid or incurred after Dec. 31, 2013, see section 111(c) of Pub. L. 113–295, set out as a note under section 41 of this title.

Amendment by Pub. L. 112–240 applicable to amounts paid or incurred after Dec. 31, 2011, see section 301(d)(1) of Pub. L. 112–240, set out as a note under section 41 of this title.

Amendment by Pub. L. 111–312 applicable to amounts paid or incurred after Dec. 31, 2009, see section 731(c) of Pub. L. 111–312, set out as a note under section 41 of this title.

Amendment by Pub. L. 110–343 applicable to amounts paid or incurred after Dec. 31, 2007, see section 301(e)(2) of Pub. L. 110–343, set out as a note under section 41 of this title.

Amendment by Pub. L. 109–432 applicable to amounts paid or incurred after Dec. 31, 2005, see section 104(a)(3) of Pub. L. 109–432, set out as a note under section 41 of this title.

Amendment by Pub. L. 108–311 applicable to amounts paid or incurred after June 30, 2004, see section 301(b) of Pub. L. 108–311, set out as a note under section 41 of this title.

Amendment by Pub. L. 106–170 applicable to amounts paid or incurred after June 30, 1999, see section 502(a)(3) of Pub. L. 106–170, set out as a note under section 41 of this title.

Amendment by Pub. L. 105–277 applicable to amounts paid or incurred after June 30, 1998, see section 1001(c) of Pub. L. 105–277, set out as a note under section 41 of this title.

Amendment by section 601(b)(2) of Pub. L. 105–34 applicable to amounts paid or incurred after May 31, 1997, see section 601(c) of Pub. L. 105–34, set out as a note under section 41 of this title.

Pub. L. 105–34, title VI, § 604(b), Aug. 5, 1997, 111 Stat. 863, provided that: “The amendment made by subsection (a) [amending this section] shall apply to amounts paid or incurred after May 31, 1997.”

Amendment by section 1204(e) of Pub. L. 104–188 applicable to taxable years ending after June 30, 1996, and not to be taken into account under section 6654 or 6655 of this title in determining amount of any installment required to be paid for a taxable year beginning in 1997, see section 1204(f) of Pub. L. 104–188, set out as a note under section 41 of this title.

Amendment by section 1205(a)(1), (b), (d)(1), (2) of Pub. L. 104–188 applicable to amounts paid or incurred in taxable years ending after June 30, 1996, see section 1205(e) of Pub. L. 104–188, set out as a note under section 45K of this title.

Pub. L. 103–66, title XIII, § 13111(c), Aug. 10, 1993, 107 Stat. 421, provided that: “The amendments made by this section [amending this section and section 41 of this title] shall apply to taxable years ending after June 30, 1992.”

Pub. L. 102–227, title I, § 102(c), Dec. 11, 1991, 105 Stat. 1686, provided that: “The amendments made by this section [amending this section and section 41 of this title] shall apply to taxable years ending after December 31, 1991.”

Pub. L. 102–227, title I, § 111(b), Dec. 11, 1991, 105 Stat. 1689, provided that: “The amendment made by this section [amending this section] shall apply to taxable years ending after December 31, 1991.”

Pub. L. 101–508, title XI, § 11402(c), Nov. 5, 1990, 104 Stat. 1388–473, provided that: “The amendments made by this section [amending this section and section 41 of this title and repealing provisions set out as a note under section 41 of this title] shall apply to taxable years beginning after December 31, 1989.”

Amendment by section 1018(q)(1) of 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 4008(c)(1) of Pub. L. 100–647 applicable to taxable years beginning after Dec. 31, 1988, see section 4008(d) of Pub. L. 100–647, set out as a note under section 41 of this title.

Amendment by section 231(d)(3)(A) of Pub. L. 99–514 applicable to taxable years beginning after Dec. 31, 1985, see section 231(g) of Pub. L. 99–514, set out as a note under section 41 of this title.

Amendment by section 701(c)(2) 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 section 1275(c)(4) of Pub. L. 99–514 applicable to taxable years beginning after Dec. 31, 1986, with certain exceptions and qualifications, see section 1277 of Pub. L. 99–514, set out as a note under section 931 of this title.

Pub. L. 99–514, title XVIII, § 1879(b)(3), Oct. 22, 1986, 100 Stat. 2906, provided that: “The amendments made by this subsection [amending this section] shall apply to amounts paid or incurred after December 31, 1982, in taxable years ending after such date.”

Amendment by section 474(g) of Pub. L. 98–369 applicable to taxable years beginning after Dec. 31, 1983, and to carrybacks from such years, see section 475(a) of Pub. L. 98–369, set out as a note under section 21 of this title.

Amendment by section 612(e)(1) of Pub. L. 98–369, applicable to interest paid or accrued after December 31, 1984, on indebtedness incurred after December 31, 1984, see section 612(g) of Pub. L. 98–369, set out as an Effective Date note under section 25 of this title.

Pub. L. 97–414, § 4(d), Jan. 4, 1983, 96 Stat. 2056, provided that: “The amendments made by this section [enacting this section and amending sections 280C and 6096 of this title] shall apply to amounts paid or incurred after December 31, 1982, in taxable years ending after such date.”

For provisions that nothing in amendment by section 401(d)(1)(D)(iii) of Pub. L. 115–141 be construed to affect treatment of certain transactions occurring, property acquired, or items of income, loss, deduction, or credit taken into account prior to Mar. 23, 2018, for purposes of determining liability for tax for periods ending after Mar. 23, 2018, see section 401(e) of Pub. L. 115–141, set out as a note under section 23 of this title.

For applicability of amendment by section 701(c)(2) 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.

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.