For inflation adjustment of certain items in this section, see Internal Revenue Notices listed in a table under section 401 of this title.

The Alaska Native Claims Settlement Act, referred to in subsec. (c)(6), is Pub. L. 92–203, Dec. 18, 1971, 85 Stat. 688, which is classified generally to chapter 33 (§ 1601 et seq.) of Title 43, Public Lands. For complete classification of this Act to the Code, see Short Title note set out under section 1601 of Title 43 and Tables.

The date of the enactment of this paragraph, referred to in subsec. (e)(4), is the date of enactment of Pub. L. 103–66, which was approved Aug. 10, 1993.

2020—Subsec. (f). Pub. L. 116–260 substituted “December 31, 2021” for “December 31, 2020”.

2019—Subsec. (f). Pub. L. 116–94 substituted “December 31, 2020” for “December 31, 2017”.

2018—Subsec. (f). Pub. L. 115–123 substituted “December 31, 2017” for “December 31, 2016”.

2015—Subsec. (f). Pub. L. 114–113 substituted “December 31, 2016” for “December 31, 2014”.

2014—Subsec. (b)(1)(B). Pub. L. 113–295, § 216(a), inserted at end “If any portion of wages are taken into account under subsection (e)(1)(A) of section 51, the preceding sentence shall be applied by substituting ‘2-year period’ for ‘1-year period’.”

Subsec. (f). Pub. L. 113–295, § 114(a), substituted “December 31, 2014” for “December 31, 2013”.

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

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

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

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

2004—Subsec. (c)(3). Pub. L. 108–311, § 404(b)(1), inserted “, except that the base period taken into account for purposes of such adjustment shall be the calendar quarter beginning October 1, 1993” before period at end.

Subsec. (f). Pub. L. 108–311, § 315, substituted “December 31, 2005” for “December 31, 2004”.

2002—Subsec. (f). Pub. L. 107–147 substituted “December 31, 2004” for “December 31, 2003”.

1998—Subsec. (b)(1)(B). Pub. L. 105–206 substituted “work opportunity credit” for “targeted jobs credit” in heading.

1996—Subsec. (b)(1)(B). Pub. L. 104–188, which directed that subsec. (b)(1)(B) of this section be amended in the text by substituting “work opportunity credit” for “targeted jobs credit”, could not be executed because the words “targeted jobs credit” did not appear in the text.

Pub. L. 116–260, div. EE, title I, § 135(b), Dec. 27, 2020, 134 Stat. 3053, provided that: “The amendment made by this section [amending this section] shall apply to taxable years beginning after December 31, 2020.”

Pub. L. 116–94, div. Q, title I, § 111(b), Dec. 20, 2019, 133 Stat. 3228, provided that: “The amendment made by this section [amending this section] shall apply to taxable years beginning after December 31, 2017.”

Pub. L. 115–123, div. D, title I, § 40301(b), Feb. 9, 2018, 132 Stat. 145, provided that: “The amendment made by this section [amending this section] shall apply to taxable years beginning after December 31, 2016.”

Pub. L. 114–113, div. Q, title I, § 161(b), Dec. 18, 2015, 129 Stat. 3066, provided that: “The amendment made by this section [amending this section] shall apply to taxable years beginning after December 31, 2014.”

Pub. L. 113–295, div. A, title I, § 114(b), Dec. 19, 2014, 128 Stat. 4014, provided that: “The amendment made by this section [amending this section] shall apply to taxable years beginning after December 31, 2013.”

Pub. L. 113–295, div. A, title II, § 216(b), Dec. 19, 2014, 128 Stat. 4034, provided that: “The amendment made by this section [amending this section] shall take effect as if included in the provision of the Tax Relief and Health Care Act of 2006 [Pub. L. 109–432] to which it relates.”

Pub. L. 112–240, title III, § 304(b), Jan. 2, 2013, 126 Stat. 2329, provided that: “The amendment made by this section [amending this section] shall apply to taxable years beginning after December 31, 2011.”

Pub. L. 111–312, title VII, § 732(b), Dec. 17, 2010, 124 Stat. 3317, provided that: “The amendment made by this section [amending this section] shall apply to taxable years beginning after December 31, 2009.”

Pub. L. 110–343, div. C, title III, § 314(b), Oct. 3, 2008, 122 Stat. 3872, provided that: “The amendment made by this section [amending this section] shall apply to taxable years beginning after December 31, 2007.”

Pub. L. 109–432, div. A, title I, § 111(b), Dec. 20, 2006, 120 Stat. 2940, provided that: “The amendment made by this section [amending this section] shall apply to taxable years beginning after December 31, 2005.”

Pub. L. 108–311, title IV, § 404(f), Oct. 4, 2004, 118 Stat. 1188, provided that: “The amendments made by this section [amending this section and sections 403, 408, 415, 530, and 4972 of this title] shall take effect as if included in the provisions of the Economic Growth and Tax Relief Reconciliation Act of 2001 [Pub. L. 107–16] to which they relate.”

Amendment by Pub. L. 104–188 applicable to individuals who begin work for the employer after Sept. 30, 1996, see section 1201(g) of Pub. L. 104–188, set out as a note under section 38 of this title.

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