Treasury Adopts Reproposed Section 357(c) Regulations: Resolving Intragroup Stock Basis Timing and Liability Mechanics Under Section 1.1502-80(d)
Treasury Decision, Non-Applicability of Section 357(c) to Consolidated Groups, T.D. 10059, RIN 1545-BJ87, 91 Fed. Reg. 21253 (Oct. 16, 2026); codified at 26 C.F.R. § 1.1502-80(d)
For corporate tax practitioners advising consolidated affiliated groups, intercompany transfers of operating assets accompanied by assumed liabilities represent a routine yet highly technical area of subchapter C and consolidated return tax practice. Under general separate-return principles governed by Internal Revenue Code (I.R.C.) § 351 and § 357(c)(1), if the sum of liabilities assumed by a transferee corporation exceeds the total adjusted tax basis of property transferred in an exchange, the transferor must recognize gain equal to such excess. However, Treasury Regulation § 1.1502-80(d) explicitly overrides this general statutory rule, providing that I.R.C. § 357(c) does not apply to intragroup transfers governed by the intercompany transaction rules of Treas. Reg. § 1.1502-13.
While the turning off of I.R.C. § 357(c) prevents immediate gain recognition within a consolidated group, it historically introduced a significant statutory coordination glitch regarding the timing and mechanics of stock basis adjustments under I.R.C. § 358. Specifically, practitioners faced ambiguity over whether deductible liabilities described in I.R.C. § 357(c)(3)(A)—which normally do not reduce stock basis under I.R.C. § 358(d)(2) in a separate-return exchange—should reduce stock basis upon the initial asset transfer (a “front-end adjustment”) or only when absorbed as a deduction under the investment adjustment provisions of Treas. Reg. § 1.1502-32 (a “back-end adjustment”).
To eliminate lingering uncertainty resulting from the regulatory withdrawal of earlier proposed rules, the Department of the Treasury and the Internal Revenue Service (IRS) issued Notice of Proposed Rulemaking REG-134420-10 (89 Fed. Reg. 106884, Dec. 30, 2024), reproposing consolidated § 357(c) regulations in modified form. Subsequently, Treasury promulgated Final Regulations under Treasury Decision (T.D.) 10059 (91 Fed. Reg. 21253, Oct. 16, 2026). This article provides a comprehensive technical analysis of the reasons for these regulations, the Treasury’s statutory rationale under I.R.C. § 1502, the specific structural revisions to Treas. Reg. § 1.1502-80(d), comprehensive numerical illustrations, and practitioner reliance guidelines.
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