Functional Reality vs. Form Under SECA: The Second Circuit’s Affirmance in Soroban Capital Partners and the Evolving Circuit Landscape
Soroban Capital Partners LP v. Commissioner of Internal Revenue, Nos. 25-2079 (L), 25-2250 (CON) (2d Cir. Sept. 17, 2026), aff’g 161 T.C. 310 (2023), and T.C.M. (RIA) 2025-52.
K Alain, L.L.L.P. v. Commissioner of Internal Revenue, No. 24-60240, 184 F.4th 766 (5th Cir. Aug. 12, 2026), granting reh’g, withdrawing and substituting 165 F.4th 374 (5th Cir. 2026), vacating and remanding Nos. 11587-20, 30118-21 (U.S. Tax Court Feb. 20, 2024)
The tax world has reached a defining moment regarding the application of the federal Self-Employment Contributions Act (SECA) tax to partnership distributive shares. For over a decade, asset managers, private equity sponsors, hedge fund operators, and pass-through entities have relied heavily on state-law limited partnership structures to insulate active partner distributive shares from the 15.3% SECA tax imposed under Internal Revenue Code (I.R.C.) § 1401(a)–(b). That reliance has encountered a formidable wall of judicial precedent.
On September 17, 2026, the United States Court of Appeals for the Second Circuit issued its highly anticipated decision in Soroban Capital Partners LP v. Commissioner of Internal Revenue, Nos. 25-2079 (L), 25-2250 (CON) (2d Cir. Sept. 17, 2026), affirming the United States Tax Court’s rulings in Soroban Capital Partners LP v. Commissioner (“Soroban I”), 161 T.C. 310 (2023), and Soroban Capital Partners LP v. Commissioner (“Soroban II”), T.C.M. (RIA) 2025-52, 2025 WL 1517432 (May 28, 2025). The Second Circuit held unequivocally that the statutory exemption under I.R.C. § 1402(a)(13) for a “limited partner, as such” does not protect partners who exert operational or managerial control over a partnership’s business, regardless of their formal designation under state partnership law.
This significant ruling comes shortly after the United States Court of Appeals for the Fifth Circuit granted rehearing, withdrew its initial opinion in Sirius Solutions, L.L.L.P. v. Commissioner, 165 F.4th 374 (5th Cir. 2026), and issued a revised opinion under the taxpayer’s renamed entity, K Alain, L.L.L.P. v. Commissioner, No. 24-60240, 184 F.4th 766 (5th Cir. Aug. 12, 2026).
For CPAs, Enrolled Agents, and tax attorneys advising pass-through entities, understanding the precise statutory mechanics, procedural jurisdictional hurdles, and substantive functional standards established by these decisions is critical. This article provides a comprehensive technical analysis of the facts in Soroban, the taxpayers’ request for relief, the Second Circuit’s statutory analysis, the application of law to facts, and a rigorous comparison with the Fifth Circuit’s revised decision in K Alain to evaluate whether a true circuit split exists.
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