26 CFR 301.6241-4: -4 Payments nondeductible.

(a) Payments nondeductible. No deduction is allowed under subtitle A of the Internal Revenue Code (Code) for any payment required to be made by a partnership under subchapter C of chapter 63 of the Code (subchapter C of chapter 63). Payment by a partnership of any amount required to be paid under subchapter C of chapter 63, including any imputed underpayment (as defined in § 301.6241-1(a)(3)), or interest, penalties, additions to tax, or additional amounts with respect to an imputed underpayment, is treated as an expenditure described in section 705(a)(2)(B).

(b) Applicability date—(1) In general. Except as provided in paragraph (b)(2) of this section, this section applies to partnership taxable years beginning after December 31, 2017, and ending after August 12, 2018.

(2) Election under § 301.9100-22 in effect. This section applies to any partnership taxable year beginning after November 2, 2015, and before January 1, 2018, for which a valid election under § 301.9100-22 is in effect.