On January 16, 2026, the Fifth Circuit Court rendered its decision in Sirius Solutions, LLLP v. Commissioner, a case concerning Self-Employment Tax, with particular emphasis on the definition of a “limited partner” under section § 1402(a)(13). This case is one of three pending decisions regarding Self-Employment Taxation and the classification of a “limited partner,” alongside Denham Capital Management LP v. Commissioner (appealed to the First Circuit) and Soroban Capital Partners LP v. Commissioner (appealed to the Second Circuit).
The Central Dispute: State Law vs. Federal Interpretation
A central issue across these cases is whether the designation of “limited partner” should be determined by state law, regardless of involvement or activity level. The Internal Revenue Service (IRS) contends that federal law governs the interpretation of federal tax statutes, emphasizing economic substance over legal labels. The IRS further maintains that the limited partner exception should apply exclusively to passive investors, as historically supported by partnership law.
The Fifth Circuit’s Ruling
The Fifth Circuit, however, raised concerns with this position, noting inconsistency with guidance found elsewhere. Notably, after examining definitions from Webster’s Dictionary, form instructions, and the complex “Functional Analysis Test” articulated in Soroban 161 T.C. 319, the Fifth Circuit Court concluded that the defining characteristic of a “limited partner” is limited liability. Accordingly, within the meaning of § 1402(a)(13), a limited partner is recognized as one who holds limited liability under state-law limited partnerships.
Implications for Fund Managers
While this ruling provides potential clarity for taxpayers within the Fifth Circuit, it introduces additional complexity for both taxpayers and the IRS in other jurisdictions, given ongoing differences in the interpretation of “limited partner.” The IRS is expected to continue applying its original arguments, evaluating the facts and circumstances to determine partner activity levels under an activity-based test.
For updates on related cases and evolving tax guidance, please visit our Insights Page. For further information regarding the implications for your partnership, contact your Richey May tax professional or Steve Vlasak, Business Development Partner, Alternative Investments Practice.
