The date of the enactment of the Revenue Reconciliation Act of 1990, referred to in subsec. (d), is the date of enactment of Pub. L. 101–508, which was approved Nov. 5, 1990.

A prior section 50, Pub. L. 92–178, title I, § 101(a), Dec. 10, 1971, 85 Stat. 498, related to restoration of credit for investment in certain depreciable property, prior to repeal by Pub. L. 95–600, title III, § 312(c)(1), Nov. 6, 1978, 92 Stat. 2826, applicable to taxable years ending after Dec. 31, 1978.

2005—Subsec. (a)(2)(E). Pub. L. 109–135 substituted “section 48 (b)” for “section 48 (a)(5)”.

2004—Subsec. (c)(3). Pub. L. 108–357 struck out “or reforestation credit” after “energy credit” in introductory provisions.

1998—Subsec. (a)(5)(C). Pub. L. 105–206 substituted “this chapter” for “subpart A, B, D, or G”.

1996—Subsec. (a)(2)(C). Pub. L. 104–188, § 1704(t)(29), substituted “subsection (d)(5)” for “subsection (c)(4)”.

Subsec. (a)(2)(E). Pub. L. 104–188, § 1702(h)(11), substituted “48(a)(5)” for “48(a)(5)(A)”.

Subsec. (d). Pub. L. 104–188, § 1616(b)(1), inserted closing provisions.

Amendment by Pub. L. 108–357 applicable with respect to expenditures paid or incurred after Oct. 22, 2004, see section 322(e) of Pub. L. 108–357, set out as a note under section 46 of this title.

Amendment by Pub. L. 105–206 effective, except as otherwise provided, as if included in the provisions of the Taxpayer Relief Act of 1997, Pub. L. 105–34, to which such amendment relates, see section 6024 of Pub. L. 105–206, set out as a note under section 1 of this title.

Amendment by section 1616(b)(1) of Pub. L. 104–188 applicable to taxable years beginning after Dec. 31, 1995, see section 1616(c) of Pub. L. 104–188, set out as a note under section 593 of this title.

Amendment by section 1702(h)(11) of Pub. L. 104–188 effective, except as otherwise expressly provided, as if included in the provision of the Revenue Reconciliation Act of 1990, Pub. L. 101–508, title XI, to which such amendment relates, see section 1702(i) of Pub. L. 104–188, set out as a note under section 38 of this title.

Section applicable to property placed in service after Dec. 31, 1990, but not applicable to any transition property (as defined in section 49 (e) of this title), any property with respect to which qualified progress expenditures were previously taken into account under section 46 (d) of this title, and any property described in section 46 (b)(2)(C) of this title, as such sections were in effect on Nov. 4, 1990, see section 11813(c) of Pub. L. 101–508, set out as an Effective Date of 1990 Amendment note under section 45K of this title.

For provisions that nothing in this section be construed to affect treatment of certain transactions occurring, property acquired, or items of income, loss, deduction, or credit taken into account prior to Nov. 5, 1990, for purposes of determining liability for tax for periods ending after Nov. 5, 1990, see section 11821(b) of Pub. L. 101–508, set out as a note under section 45K of this title.