Section 1301(a) of the Patient Protection and Affordable Care Act, referred to in subsec. (h), is classified to section 18021(a) of Title 42, The Public Health and Welfare.

Pub. L. 110–234 and Pub. L. 110–246 made identical amendments to this section. The amendments by Pub. L. 110–234 were repealed by section 4(a) of Pub. L. 110–246.

2010—Subsec. (g). Pub. L. 111–148, § 9023(c)(2), added subsec. (g) relating to qualifying therapeutic discovery project credit.

Pub. L. 111–148, § 1401(b), added subsec. (g) relating to credit for health insurance premiums.

Subsec. (h). Pub. L. 111–148, § 10105(e)(3), substituted “2010, 2011” for “2011”.

Pub. L. 111–148, § 1421(d)(1), added subsec. (h).

2008—Subsec. (a). Pub. L. 110–245 inserted “45P(a),” after “45A(a),”.

Subsec. (f). Pub. L. 110–246, § 15343(c), added subsec. (f).

2007—Subsec. (d). Pub. L. 110–172 amended heading and text generally. Prior to amendment, text read as follows: “No deduction shall be allowed for that portion of the expenses otherwise allowable as a deduction for the taxable year which is equal to the amount of the credit determined for the taxable year under section 45H(a).”

2006—Subsec. (e). Pub. L. 109–432 added subsec. (e).

2005—Subsec. (a). Pub. L. 109–135, § 201(b)(2), substituted “1400P(b), and 1400R” for “and 1400P(b)”.

Pub. L. 109–135, § 103(b)(2), substituted “1396(a), and 1400P(b)” for “and 1396(a)”.

2004—Subsec. (d). Pub. L. 108–357 added subsec. (d).

2000—Subsec. (c)(1). Pub. L. 106–554 struck out “or credit” after “deduction” in two places.

1999—Subsec. (c)(1). Pub. L. 106–170 inserted “or credit” after “deduction” in two places.

1996—Subsec. (b)(1). Pub. L. 104–188, § 1205(d)(7), substituted “section 45C(b)” for “section 28(b)”, “section 45C” for “section 28”, and “section 38(c)” for “subsection (d)(2) thereof”.

Subsec. (b)(2)(A). Pub. L. 104–188, § 1205(d)(7)(B), (C), substituted “section 45C” for “section 28” and “section 38(c)” for “subsection (d)(2) thereof”.

1993—Subsec. (a). Pub. L. 103–66, § 13322(c)(1), substituted “45A(a), 51(a), and” for “51(a)”.

Pub. L. 103–66, § 13302(b)(1), substituted “Rule for employment credits” for “Rule for targeted jobs credit” in heading and “the sum of the credits determined for the taxable year under sections 51(a) and 1396(a)” for “the amount of the credit determined for the taxable year under section 51(a)” in text.

1989—Subsec. (c)(1), (2)(A). Pub. L. 101–239, § 7110(c)(1), struck out “50 percent of” before “the amount of the credit”.

Subsec. (c)(3). Pub. L. 101–239, § 7814(e)(2)(A), added par. (3). Former par. (3) redesignated (4).

Subsec. (c)(3)(B)(ii)(I). Pub. L. 101–239, § 7110(c)(1), struck out “50 percent of” before “the amount described”.

Subsec. (c)(4). Pub. L. 101–239, § 7814(e)(2)(A), redesignated par. (3) as (4).

1988—Subsec. (c). Pub. L. 100–647 added subsec. (c).

1986—Subsec. (b)(1), (2)(A). Pub. L. 99–514, § 1847(b)(8), substituted “section 28(b)” for “section 29(b)” in par. (1) and “section 28” for “section 29” in pars. (1) and (2)(A).

Subsec. (b)(3). Pub. L. 99–514, § 231(d)(3)(E), substituted “section 41(f)(5)”, “section 41(f)(1)(B)”, and “section 41(f)(1)” for “section 30(f)(5)”, “section 30(f)(1)(B)”, and “section 30(f)(1)”, respectively.

1984—Subsec. (a). Pub. L. 98–369, § 474(r)(10)(A), (B), redesignated subsec. (b) as (a), in heading substituted “targeted jobs credit” for “section 44B credit”, and in text substituted “No deduction shall be allowed for that portion of the wages or salaries paid or incurred for the taxable year which is equal to the amount of the credit determined for the taxable year under section 51(a)” for “No deduction shall be allowed for that portion of the wage or salaries paid or incurred for the taxable year which is equal to the amount of the credit allowable for the taxable year under section 44B (relating to credit for employment of certain new employees) determined without regard to the provisions of section 53 (relating to limitation based on amount of tax)”. Former subsec. (a), which had provided that no deduction would be allowed for that portion of the work incentive program expenses paid or incurred for the taxable year which was equal to the amount of the credit allowable for the taxable year under section 40 (relating to credit for expenses of work incentive programs) determined without regard to the provisions of section 50A(a)(2) (relating to limitation based on amount of tax), and that in the case of a corporation which was a member of a controlled group of corporations (within the meaning of section 50B(g)(1) or a trade or business which was treated as being under common control with other trades or businesses within the meaning of section 50B(g)(2), this subsection would be applied under rules prescribed by the Secretary similar to the rules applicable under paragraphs (1) and (2) of section 50B(g), was struck out.

Subsec. (b). Pub. L. 98–369, § 474(r)(10)(A), redesignated subsec. (c) as (b). Former subsec. (b) redesignated (a).

Subsec. (b)(1), (2)(A). Pub. L. 98–369, § 474(r)(10)(C), substituted “29” for “44H”.

Subsec. (b)(3). Pub. L. 98–369, § 474(r)(10)(D), substituted “section 30(f)(5)” for “section 44F(f)(5)”, “section 30(f)(1)(B)” for “section 44F(f)(1)(B)”, and “section 30(f)(1)” for “section 44F(f)(1)”.

Subsec. (c). Pub. L. 98–369, § 474(r)(10)(A), redesignated subsec. (c) as (b).

1983—Pub. L. 97–414, § 4(b)(2)(A), substituted “Certain expenses for which credits are allowable” for “Portion of wages for which credit is claimed under section 40 or 44B” in section catchline.

Subsec. (c). Pub. L. 97–414, § 4(b)(1), added subsec. (c).

1978—Pub. L. 95–600, as amended by Pub. L. 96–178 and Pub. L. 96–222, substituted “section 40 or 44B” for “section 44B” in section catchline, and in text designated existing provisions as subsec. (b) and added subsec. (a).

Amendment by section 1401(b) of Pub. L. 111–148 applicable to taxable years ending after Dec. 31, 2013, see section 1401(e) of Pub. L. 111–148, set out as a note under section 36B of this title.

Amendment by section 1421(d)(1) of Pub. L. 111–148 applicable to amounts paid or incurred in taxable years beginning after Dec. 31, 2009, see section 1421(f)(1) of Pub. L. 111–148, set out as a note under section 38 of this title.

Amendment by section 9023(c)(2) of Pub. L. 111–148 applicable to amounts paid or incurred after Dec. 31, 2008, in taxable years beginning after such date, see section 9023(f) of Pub. L. 111–148, set out as a note under section 46 of this title.

Amendment by section 10105(e)(3) of Pub. L. 111–148 effective as if included in the enactment of section 1421 of Pub. L. 111–148, see section 10105(e)(5) of Pub. L. 111–148, set out as a note under section 45R of this title.

Amendment of this section and repeal of Pub. L. 110–234 by Pub. L. 110–246 effective May 22, 2008, the date of enactment of Pub. L. 110–234, except as otherwise provided, see section 4 of Pub. L. 110–246, set out as an Effective Date note under section 8701 of Title 7, Agriculture.

Amendment by section 15343(c) of Pub. L. 110–246 applicable to amounts paid or incurred after June 18, 2008, see section 15343(e) of Pub. L. 110–246, set out as a note under section 38 of this title.

Amendment by Pub. L. 110–245 applicable to amounts paid after June 17, 2008, see section 111(e) of Pub. L. 110–245, set out as a note under section 38 of this title.

Amendment by Pub. L. 110–172 effective as if included in the provision of the American Jobs Creation Act of 2004, Pub. L. 108–357, to which such amendment relates, see section 7(e) of Pub. L. 110–172, set out as a note under section 1092 of this title.

Amendment by Pub. L. 109–432 applicable to taxable years beginning after Dec. 31, 2005, see section 405(e) of Pub. L. 109–432, set out as a note under section 38 of this title.

Amendment by Pub. L. 108–357 applicable to expenses paid or incurred after Dec. 31, 2002, in taxable years ending after such date, see section 339(f) of Pub. L. 108–357, set out as a note under section 38 of this title.

Amendment by Pub. L. 106–554 effective as if included in the provisions of the Ticket to Work and Work Incentives Improvement Act of 1999, Pub. L. 106–170, to which such amendment relates, see section 1(a)(7) [title III, § 311(d)] of Pub. L. 106–554, set out as a note under section 30A of this title.

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

Amendment by 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.

Amendment by section 13322(c)(1) of Pub. L. 103–66 applicable to wages paid or incurred after Dec. 31, 1993, see section 13322(f) of Pub. L. 103–66, set out as a note under section 38 of this title.

Amendment by section 7110(c)(1) of 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 section 7814(e)(2)(A) of Pub. L. 101–239 effective, except as otherwise provided, as if included in the provision of the Technical and Miscellaneous Revenue Act of 1988, Pub. L. 100–647, to which such amendment relates, see section 7817 of Pub. L. 101–239, set out as a note under section 1 of this title.

Amendment by 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)(E) 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 1847(b)(8) of Pub. L. 99–514 effective, except as otherwise provided, as if included in the provisions of the Tax Reform Act of 1984, Pub. L. 98–369, div. A, to which such amendment relates, see section 1881 of Pub. L. 99–514, set out as a note under section 48 of this title.

Amendment by 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 Pub. L. 97–414 applicable to amounts paid or incurred after December 31, 1982, in taxable years ending after such date, see section 4(d) of Pub. L. 97–414, set out as an Effective Date note under section 28 of this title.

Pub. L. 95–600, title III, § 322(e), Nov. 6, 1978, 92 Stat. 2839, as amended by Pub. L. 96–178, § 6(a), (b), Jan. 2, 1980, 93 Stat. 1297; Pub. L. 96–222, title I, § 103(a)(7)(A), (B), Apr. 1, 1980, 94 Stat. 211; Pub. L. 99–514, § 2, Oct. 22, 1986, 100 Stat. 2095, provided that: “(1) In general.—Except as otherwise provided in this subsection, the amendments made by this section [amending this section and sections 50A and 50B of this title] shall apply to work incentive program expenses paid or incurred after December 31, 1978, in taxable years ending after such date; except that so much of the amendment made by subsection (a) as affects section 50A(a)(2) of the Internal Revenue Code of 1986 [formerly I.R.C. 1954] shall apply to taxable years beginning after December 31, 1978. For purposes of applying section 50A(a)(2) of the Internal Revenue Code of 1986 with respect to a taxable year beginning before January 1, 1979, the rules of sections 50A(a)(4), 50A(a)(5), and 50B(e)(3) of such Code (as in effect on the day before the date of the enactment of this Act [Nov. 6, 1978] shall apply. “(2) Special rules for certain eligible employees.—“(A) Eligible employees hired before september 27, 1978.—In the case of any eligible employee (as defined in section 50B(h)) hired before September 27, 1978, no credit shall be allowed under section 40 with respect to second-year work incentive program expenses (as defined in section 50B(a)) attributable to service performed by such employee. “(B) Eligible employees hired after september 26, 1978.—In the case of any eligible employee (as defined in section 50B(h)) hired after September 26, 1978, for purposes of applying the amendments made by this section, such individual shall be treated for purposes of the credit allowed by section 40 as having first begun work for the taxpayer not earlier than January 1, 1979, and any wages paid or incurred after December 31, 1978, with respect to such individual shall be considered to be attributable to services rendered after that date.”

[Pub. L. 96–178, § 6(d), Jan. 2, 1980, 93 Stat. 1298, provided that: “Any amendment made by this section to the Revenue Act of 1978 [amending section 322(e)(1) and (2) of Pub. L. 95–600, set out above] shall take effect as if it had been included in the provision of the Revenue Act of 1978 [Pub. L. 95–600] to which such amendment relates.” ]

Section applicable to taxable years beginning after Dec. 31, 1976, and to credit carrybacks from such years, see section 202(e) of Pub. L. 95–30, set out as a note under section 51 of this title.

Pub. L. 101–239, title VII, § 7814(e)(2)(B), Dec. 19, 1989, 103 Stat. 2413, provided that: “In the case of a taxable year for which the last date for making the election under section 280C(c)(3) of the Internal Revenue Code of 1986 (as added by subparagraph (A)) is on or before the date which is 75 days after the date of the enactment of this Act [Dec. 19, 1989], such an election for such year may be made— “(i) at any time before the date which is 75 days after such date of enactment, and “(ii) in such form and manner as the Secretary of the Treasury or his delegate may prescribe.”

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.