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.

Regulatory History and the Administrative Genesis of the Reproposal

Understanding the modern mandate of Treas. Reg. § 1.1502-80(d) requires tracing its thirty-four-year administrative evolution across multiple regulatory actions:

Promulgation of Treas. Reg. § 1.1502-80(d) (T.D. 8402): Promulgated on March 18, 1992 (57 Fed. Reg. 9385), Treas. Reg. § 1.1502-80(d) established that I.R.C. § 357(c) does not apply to intragroup transactions governed by Treas. Reg. § 1.1502-13, effective for consolidated return years beginning on or after January 1, 1995.
The 2001 Proposed Regulations (REG-137519-01): Following T.D. 8402, tax professionals raised concerns that because I.R.C. § 357(c) was turned off, I.R.C. § 357(c)(3) liabilities could technically fail to qualify for the exception in I.R.C. § 358(d)(2). On November 14, 2001, Treasury published proposed regulations (66 Fed. Reg. 57021) clarifying that I.R.C. § 358(d)(2) excludes I.R.C. § 357(c)(3)(A) liabilities from money received under I.R.C. § 358(d)(1) in intragroup transfers.
The 2023 Clean-Up Project and Withdrawal (REG-134420-10): On August 7, 2023, Treasury published proposed regulations (88 Fed. Reg. 52057) designed to modernize consolidated return rules and remove outdated provisions. Believing that explicit rules in § 1.1502-80(d) were redundant because Treas. Reg. §§ 1.1502-32 and 1.1502-80(a)(2) already prohibit duplicative basis reductions, Treasury formally withdrew the 2001 proposed regulations.
Public Comments and Taxpayer Confusion: The 2023 withdrawal triggered immediate pushback from tax professionals. Commenters emphasized that withdrawing the 2001 proposed rules created profound ambiguity, leaving taxpayers uncertain whether Treasury intended to mandate a “front-end” stock basis reduction under I.R.C. § 358 or a “back-end” adjustment under Treas. Reg. § 1.1502-32(b).
The 2024 Reproproposal (REG-134420-10): On December 30, 2024, Treasury published proposed regulations (89 Fed. Reg. 106884) explicitly reproposing the 2001 approach in modified form to affirm that a “back-end adjustment” is the appropriate regime.
The 2026 Final Regulations (T.D. 10059): Finding no adverse public comments, Treasury finalized REG-134420-10 in T.D. 10059 (91 Fed. Reg. 21253, scheduled publication Oct. 16, 2026), with minor non-substantive adjustments.

Technical Analysis of the Double Reduction Trap and Practitioner Debate

The primary objective of REG-134420-10 is to eliminate a potential “double reduction trap” inherent in a literal, isolated reading of I.R.C. §§ 351, 357, and 358 in a consolidated group context.

Under general separate-return tax law, I.R.C. § 358(a)(1) provides that a transferor’s basis in stock received in an I.R.C. § 351 exchange equals the adjusted basis of property transferred, decreased by the amount of money received. Under I.R.C. § 358(d)(1), the assumption of a liability by the transferee is treated as money received. However, I.R.C. § 358(d)(2) provides an essential exception: liabilities excluded under I.R.C. § 357(c)(3) (such as accounts payable or contingent liabilities that give rise to a deduction when paid) are excluded from being treated as money received under I.R.C. § 358(d)(1).

When Treas. Reg. § 1.1502-80(d) turns off I.R.C. § 357(c) for intragroup transfers, an aggressive or literal interpretation suggested that because I.R.C. § 357(c) “does not apply,” I.R.C. § 357(c)(3) could not operate. Consequently, an assumed deductible liability would be treated as money received under I.R.C. § 358(d)(1), immediately reducing the transferor’s stock basis in the transferee at the time of the exchange.

As Treasury articulated in the preamble to REG-134420-10:

“because section 357(c) does not apply to certain intragroup section 351 exchanges... under § 1.1502-80(d), a concern arose that no liabilities can technically be excluded under section 357(c)(3). Therefore, in such an intragroup section 351 exchange, the transferor’s basis in the stock of the transferee received in the transfer first would be reduced by liabilities assumed by the transferee, including those liabilities described in section 357(c)(3) that would not have reduced basis had section 357(c) applied. The transferor’s basis in the stock of the transferee then would be reduced a second time under the principles of § 1.1502-32 at the time the liability does in fact give rise to a deduction on the part of the transferee and is taken into account on the consolidated return. This result ultimately could cause the transferor to recognize an amount of gain on the sale of the stock of the transferee that does not clearly reflect income.”

In responding to the 2023 regulatory withdrawal, public comments urged Treasury to codify the “back-end adjustment approach.” As Treasury noted in the preamble:

“A commenter stated that, in light of the withdrawal of the proposed consolidated section 357(c) regulations, it is unclear whether the transferor’s basis in the transferee stock should be reduced for an assumed section 357(c)(3)(A) liability: (i) at the time of the section 351 exchange under section 358 of the Code... (front-end adjustment); or (ii) at the time the deduction for the assumed section 357(c)(3)(A) liability is absorbed that reduces basis under § 1.1502-32(b)... (back-end adjustment). The commenter recommended the back-end adjustment approach for various reasons, including the additional compliance costs and complexity associated with tracking and monitoring the transferee’s § 1.1502-32(b) basis adjustments... under the front-end adjustment approach.”

Responding directly to these industry concerns, Treasury issued the 2024 Proposed Regulations, stating:

“The withdrawal of the proposed consolidated section 357(c) regulations was not intended to suggest that a front-end adjustment approach is required. To reflect the Treasury Department’s and the IRS’s view regarding the appropriate timing for the single basis reduction for an assumed section 357(c)(3)(A) liability, and to clarify that a back-end adjustment is appropriate, this document would repropose the proposed consolidated section 357(c) regulations in modified form.”

Treasury Analysis of the Law and Statutory Justification Under Section 1502

Treasury’s authority to modify Chapter 1 separate-return rules for consolidated groups is grounded in I.R.C. § 1502 and I.R.C. § 7805(a). As Treasury highlighted in the statutory authority section of the proposed regulations:

“Section 1502 authorizes the Secretary of the Treasury or her delegate (Secretary) to prescribe consolidated return regulations for an affiliated group of corporations that join in filing (or that are required to join in filing) a consolidated return (consolidated group) to clearly reflect the Federal income tax liability of the consolidated group and to prevent avoidance of such tax liability.”

Treasury further emphasized that to carry out these statutory mandates:

“section 1502 also permits the Secretary to prescribe rules that may be different from the provisions of chapter 1 of the Code (chapter 1) that would apply if the corporations composing the consolidated group filed separate returns.”

In analyzing the legal framework, Treasury harmonized three fundamental consolidated return principles:

Applicability of General Law: Under Treas. Reg. § 1.1502-80(a)(1), the Code and general tax law apply to consolidated groups except as explicitly excluded or modified by the consolidated return regulations.
Prohibition Against Duplicative Adjustments: Treas. Reg. § 1.1502-80(a)(2) sets forth an overarching principle that nothing in the consolidated return regulations shall be applied to require an adjustment that duplicates any other adjustment required under the Code. Requiring a front-end reduction under I.R.C. § 358 followed by a back-end reduction under Treas. Reg. § 1.1502-32(b) directly violates this rule.
Single-Entity Principles and Clear Reflection of Income: Under Treas. Reg. § 1.1502-80(a)(3), consolidated groups are treated as a single economic enterprise. Deferring the stock basis reduction until the underlying liability generates an absorbed deduction under Treas. Reg. § 1.1502-32(b) perfectly aligns the timing of stock basis adjustments with the group’s economic income and taxable income.

Revisions, Additions, and Deletions to Regulations in Section 1.1502-80(d)

The Proposed Regulations (REG-134420-10) and Final Regulations (T.D. 10059) enact several structural amendments to Treas. Reg. § 1.1502-80(d):

Revisions to Paragraph (d)(1)

Proposed Reg. § 1.1502-80(d)(1)(i) replaces the former paragraph (d)(1) text with explicit statutory cross-references coordinating I.R.C. § 358(d)(2) and I.R.C. § 357(c)(3)(A):

“Section 357(c) does not apply to any transaction to which § 1.1502-13 applies... Notwithstanding the foregoing, for purposes of determining the transferor’s basis in property under section 358(a) received in a transfer described in section 351, section 358(d)(2) operates to exclude liabilities described in section 357(c)(3)(A), other than those also described in section 357(c)(3)(B), from the computation of the amount of liabilities assumed that is treated as money received under section 358(d)(1).”

Structural Deconsolidating Anti-Abuse Exception

Proposed Reg. § 1.1502-80(d)(1)(ii) preserves and clarifies the essential anti-deconsolidation carve-out:

“This paragraph (d) does not apply to a transaction if the transferor or transferee becomes a nonmember as part of the same plan or arrangement. The transferor (or transferee) is treated as becoming a nonmember once it is no longer a member of a consolidated group that includes the transferee (or transferor).”

If either party leaves the group pursuant to the same plan, the non-applicability rule is disengaged, restoring standard separate-return rules under I.R.C. § 357(c) to prevent taxpayers from stripping assets or exporting artificial liabilities outside the group.

Structural Changes from Prior Regulations

Comparing prior Treas. Reg. § 1.1502-80(d) (as contained in 26 C.F.R. part 1, revised April 1, 2024) to the new regulation reveals three major changes:

Deletion of Ambiguous Language: Removed the former text that turned off I.R.C. § 357(c) without referencing I.R.C. § 358(d)(2).
Addition of Specific Statutory Mechanics: Explicitly incorporated I.R.C. § 358(d)(2) to carve out I.R.C. § 357(c)(3)(A) deductible liabilities from initial stock basis reductions.
Removal of Obsolete Examples: In T.D. 10059, Treasury removed an obsolete statutory example involving I.R.C. § 368(a)(1)(D) reorganizations that had become outdated following congressional amendments to I.R.C. § 357(c)(1)(B) under Section 898(b) of the American Jobs Creation Act of 2004 (P.L. 108-357).

Comprehensive Numerical Example: Asset Transfers, Liabilities, and Excess Loss Accounts

To illustrate the mechanics of Prop. Reg. § 1.1502-80(d)(1) and Final Reg. § 1.1502-80(d)(3), consider the detailed numerical scenario set forth in Example 2 of the regulation text:

Fact Pattern

Parent corporation P owns all stock of S1. S1 holds operating assets with an aggregate fair market value of $100 and an aggregate adjusted tax basis of $30. S1 has total liabilities of $40, consisting of:

$5 of deductible liabilities described in I.R.C. § 357(c)(3)(A) (e.g., accrued accounts payable or cash-basis expenses) that are not described in I.R.C. § 357(c)(3)(B); and
$35 of non-deductible liabilities (e.g., funded debt or capital obligation) not described in I.R.C. § 357(c)(3)(A).

In an intercompany exchange qualifying under I.R.C. § 351, S1 transfers all assets ($100 FMV, $30 basis) to newly formed subsidiary S2 in exchange for 100% of S2's stock and S2's assumption of all $40 of liabilities. P, S1, and S2 file a consolidated return.

Regulatory Analysis and Stock Basis Calculation

Under Prop. Reg. § 1.1502-80(d)(1) and Final Reg. § 1.1502-80(d)(3):

Non-Applicability of Gain: I.R.C. § 357(c) does not apply. S1 recognizes $0 gain on the transfer, even though total liabilities ($40) exceed total asset basis ($30).
Exclusion of Deductible Liabilities Under I.R.C. § 358(d)(2): For computing S1's initial tax basis in S2 stock under I.R.C. § 358(a), I.R.C. § 358(d)(2) operates to exclude the $5 of I.R.C. § 357(c)(3)(A) deductible liabilities from being treated as money received under I.R.C. § 358(d)(1).
Calculation of Money Received: Total liabilities assumed treated as money received equal $35 (the $40 total assumed liabilities less the $5 excluded deductible liabilities).
Resulting Stock Basis / Excess Loss Account (ELA):
1. S1's initial basis in S2 stock = Adjusted Basis of Transferred Assets ($30) minus Money Received ($35) = -$5 Excess Loss Account.
Subsequent Back-End Adjustment: When S2 subsequently pays or settles the $5 deductible liability and the deduction is absorbed on the consolidated return, S1's basis in S2 stock will be reduced by $5 under Treas. Reg. § 1.1502-32(b), adjusting the Excess Loss Account from -$5 to -$10.

This multi-step calculation ensures a single, accurate basis reduction while completely avoiding front-end double counting.

Effective Dates, Finalization, and Taxpayer Reliance Guidelines

Tax professionals evaluating pending or prior intragroup corporate restructuring transactions must note the specific applicability dates and reliance rules:

Proposed Applicability Date

Pursuant to I.R.C. § 1503(a), the proposed amendments in REG-134420-10 were slated to apply to consolidated return years for which the due date of the return (determined without regard to extensions) is after the date of publication of final regulations in the Federal Register.

Final Regulation Applicability Date (T.D. 10059)

Under Final Reg. § 1.1502-80(d)(4), the regulations apply to transactions occurring in consolidated return years for which the due date of the tax return (without regard to extensions) is after October 16, 2026. For earlier tax years, practitioners are directed to prior § 1.1502-80(d) as contained in 26 C.F.R. part 1, revised April 1, 2024 or April 1, 2026.

Taxpayer Reliance Pending Finalization and Retrospective Comfort

Because Treasury explicitly confirmed in the preamble to REG-134420-10 that the 2023 withdrawal “was not intended to suggest that a front-end adjustment approach is required” and that reproposing the regulations was intended “to clarify that a back-end adjustment is appropriate,” CPAs and EAs have clear administrative support for maintaining back-end adjustments for open tax years.

Taxpayers who consistently applied the back-end adjustment approach during the period between the 2023 withdrawal and the 2026 finalization are in full alignment with Treasury’s stated position and the overarching mandate of Treas. Reg. § 1.1502-80(a)(2).

Prepared with assistance from Gemini Notebook.