(a) In general. Except as provided in paragraphs (b), (c), (d), and (e) of this section, the provisions of §§ 1.179-1 through 1.179-5 apply for property placed in service by the taxpayer in taxable years ending after January 25, 1993. However, a taxpayer may apply the provisions of §§ 1.179-1 through 1.179-5 to property placed in service by the taxpayer after December 31, 1986, in taxable years ending on or before January 25, 1993. Otherwise, for property placed in service by the taxpayer after December 31, 1986, in taxable years ending on or before January 25, 1993, the final regulations under section 179 as in effect for the year the property was placed in service apply, except to the extent modified by the changes made to section 179 by the Tax Reform Act of 1986 (100 Stat. 2085), the Technical and Miscellaneous Revenue Act of 1988 (102 Stat. 3342) and the Revenue Reconciliation Act of 1990 (104 Stat. 1388-400). For that property, a taxpayer may apply any reasonable method that clearly reflects income in applying the changes to section 179, provided the taxpayer consistently applies the method to the property.
(b) Section 179 property placed in service by the taxpayer in a taxable year beginning after 2002 and before 2008. The provisions of § 1.179-2(b)(1) and (b)(2)(ii), the second sentence of § 1.179-4(a), and the provisions of § 1.179-5(c), reflecting changes made to section 179 by the Jobs and Growth Tax Relief Reconciliation Act of 2003 (117 Stat. 752) and the American Jobs Creation Act of 2004 (118 Stat. 1418), apply for property placed in service in taxable years beginning after 2002 and before 2008.
(c) Application of § 1.179-5(d). Section 1.179-5(d) applies on or after July 12, 2005.
(d) Application of § 1.179-4(c)(1)(iv). The provisions of § 1.179-4(c)(1)(iv) relating to section 1022 are effective on and after January 19, 2017.
(e) Application of § 1.179-4(c)(2)-(1) In general. Except as provided in paragraphs (e)(2) and (3) of this section, the provisions of § 1.179-4(c)(2) relating to section 336(e) are applicable on or after September 24, 2019.
(2) Early application of § 1.179-4(c)(2). A taxpayer may choose to apply the provisions of § 1.179-4(c)(2) relating to section 336(e) for the taxpayer's taxable years ending on or after September 28, 2017.
(3) Early application of regulation project REG-104397-18. A taxpayer may rely on the provisions of § 1.179-4(c)(2) relating to section 336(e) in regulation project REG-104397-18 (2018-41 I.R.B. 558) (see § 601.601(d)(2)(ii)(b) of this chapter) for the taxpayer's taxable years ending on or after September 28, 2017, and ending before September 24, 2019.
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