26 CFR 1.468A-9: A-9 Applicability dates.

(a) In general. Except as provided in paragraph (b) of this section, §§ 1.468A-1 through 1.468A-8 are effective on December 23, 2010, and apply with respect to taxable years ending after such date.

(b) Special rules—(1) Taxable years ending before December 23, 2010. Special rules that are provided for taxable years ending on or before December 23, 2010, such as the special rule for certain special transfers contained in § 1.468A-8(a)(4)(ii), apply with respect to such taxable years. In addition, except as provided in paragraph (2) of this section, a taxpayer may apply the provisions of §§ 1.468A-1 through 1.468A-8 with respect to a taxable year ending on or before December 23, 2010, if all such provisions are consistently applied.

(2) Applicability of § 1.468A-1(b)(6) and § 1.468A-5(b)(2)(i), (b)(2)(v), and (d)(3)(i). The rules in §§ 1.468A-1(b)(6) and 1.468A-5(b)(2)(i), (b)(2)(v), and (d)(3)(i) apply to taxable years ending on or after September 4, 2020. Taxpayers may also choose to apply the rules in § 1.468A-1(b)(6) and § 1.468A-5(b)(2)(i), (b)(2)(v), and (d)(3)(i) to prior taxable years for which a taxpayer's deemed payment deadline (as defined in § 1.468A-2(c)(1)) has not passed prior to September 4, 2020.