Applicability dates.

# (b)

Special rules—

(1)-(2) [Reserved]

(3) Relief for untimely filings. Paragraphs (b)(3)(i) through (iii) of this section set forth the effective dates for rules that provide relief for the failure to make timely filings of an election, agreement, statement, rebuttal, computation, closing agreement, or other information, pursuant to section 1503(d) and these regulations.

(i) General rule. Except as provided in paragraphs (b)(3)(ii) and (iii) of this section, the reasonable cause relief standard of § 1.1503(d)-1(d) applies for all untimely filings with respect to dual consolidated losses, including with respect to dual consolidated losses incurred in taxable years beginning before the application date.

(ii)-(iii) [Reserved]

(4) [Reserved]

(5) Basis adjustment rules. Taxpayers may apply the basis adjustment rules of § 1.1503(d)-5(g) for all open years in which such basis is relevant, even if the basis adjustment is attributable to a dual consolidated loss incurred (or recaptured) in a closed taxable year. Taxpayers applying the provisions of § 1.1503(d)-5(g), however, must do so consistently for all open years.

(6) Rules regarding domestic consenting corporations. Section 1.1503(d)-1(b)(2)(iii) and (c), as well § 1.1503(d)-3(e)(1) and (3), apply to determinations under §§ 1.1503(d)-1 through 1.1503(d)-7 relating to taxable years ending on or after December 20, 2018. For taxable years ending before December 20, 2018, see § 1.1503(d)-3(e)(1) as contained in 26 CFR part 1 revised as of April 1, 2018.

(7) Compulsory transfer triggering event exception. Section 1.1503(d)-6(f)(5)(i) through (iii) applies to transfers that occur on or after December 20, 2018. For transfers occurring before December 20, 2018, see § 1.1503(d)-6(f)(5)(i) through (iii) as contained in 26 CFR part 1 revised as of April 1, 2018. However, taxpayers may consistently apply § 1.1503(d)-6(f)(5)(i) through (iii) to transfers occurring before December 20, 2018.

(8) Rule providing that SRLY limitation applies without regard to § 1.1502-21(c)(1)(i)(E). Section 1.1503(d)-4(c)(3)(v) applies to any period to which § 1.1502-21(c)(1)(i)(E) applies.

(9)-(10) [Reserved]

(11) Disregarded payment loss rules. Section 1.1503(d)-1(d) applies to taxable years beginning on or after January 1, 2026. See also § 301.7701-2(e)(10) of this chapter (applicability dates for the entity classification provisions relevant to the disregarded payment loss rules).

(12)-(14) [Reserved]

(15) Anti-avoidance rule. Section 1.1503(d)-1(f) applies to dual consolidated losses incurred in taxable years ending on or after August 6, 2024, and to disregarded payment losses in taxable years beginning on or after January 1, 2026.

(16) [Reserved].

(17) Deemed ordering rule. Section 1.1503(d)-3(c)(3) applies to dual consolidated losses incurred in taxable years beginning on or after January 1, 2026, and to disregarded payment losses in taxable years beginning on or after January 1, 2026. For the application of the deemed ordering rule to dual consolidated losses incurred in taxable years beginning before January 1, 2026, but on or after April 18, 2007, see § 1.1503(d)-3(c)(3) as contained in 26 CFR part 1 revised as of April 1, 2024.

[T.D. 9315, 72 FR 12914, Mar. 19, 2007; 72 FR 20424, Apr. 25, 2007, as amended by T.D. 9896, 85 FR 19856, Apr. 8, 2020; T.D. 9927, 85 FR 67988, Oct. 27, 2020; T.D. 10018, 89 FR 106878, Dec. 30, 2024; T.D. 10026, 90 FR 3020, Jan. 14, 2025]