Fifth Circuit Shifts Standard for Limited Partner Self-Employment Tax Exception

In a surprising development for tax professionals, the Fifth Circuit has withdrawn its January ruling in a high-profile partnership tax case. The court has issued a substitute opinion that significantly alters the interpretation of who qualifies as a “limited partner” for the self-employment tax exception.

Background and Procedural History

In its January decision for Sirius Solutions, L.L.L.P. v. Commissioner, the U.S. Court of Appeals for the Fifth Circuit held that the term “limited partner” under section 1402(a)(13) of the tax code referred to a state-law limited partner with limited liability. Under that standard, a partner’s actual business activities were irrelevant to the exception—a departure from the IRS’s long-standing position.

On August 12, 2026, the court vacated that opinion and issued a substitute decision in the case, now captioned K Alain L.L.L.P. v. Commissioner. The court now holds that a limited partner under section 1402(a)(13) is defined as a partner who plays “no significant role in managing or running a business.”

This procedural maneuver is uncommon. Following the January ruling, the government requested an en banc rehearing to reconsider the decision. While the Fifth Circuit denied the en banc petition, the original three-judge panel treated the request as a petition for a panel rehearing. Upon reconsidering the matter, the panel withdrew its original opinion and replaced it with the new standard. Consequently, the court vacated the Tax Court’s previous decision and remanded the case for the Tax Court to evaluate the partners against this new criteria.

Tax Implications

The implications of this shift are substantial. Generally, a partner’s share of partnership income is included in net earnings from self-employment and is subject to self-employment tax. However, section 1402(a)(13) provides an exception for the distributive share of income or loss for a “limited partner, as such,” excluding certain guaranteed payments for services under section 707(c).

Taxpayers and the IRS have historically clashed over the definition of a “limited partner.” The IRS has generally contended that the exception should not protect income derived from a partner’s active services. In Soroban Capital Partners LP v. Commissioner, 161 T.C. 310 (2023), the Tax Court suggested that determining “limited partner, as such” status requires a functional analysis to see if the partner acts as a passive investor, rather than relying solely on state-law status.

The Fifth Circuit’s original January ruling had sided with the state-law status approach, suggesting that limited liability alone was sufficient. The substitute opinion abandons that bright-line rule.

The New Standard

The court’s new opinion defines a limited partner as one who “plays no significant role in managing or running a business.” Notably, the court did not define exactly what constitutes a “significant” role, leaving the Tax Court to apply this test during remand.

The court continues to reject the Tax Court’s “passive investor” functional analysis used in Soroban, but it has also moved away from the simple limited-liability rule from January. By reviewing the historical context of section 1402(a)(13) at the time of its 1977 enactment—including contemporary legal dictionaries and treatises—the court determined that the term historically described a partner who did not play a significant role in management.

The result is a shift from a bright-line rule to a facts-and-circumstances inquiry. While active participation is no longer the sole disqualifier, and limited liability is no longer a guarantee of the exception, the court has rejected the idea that status is determined purely by passivity or by legal structure alone.

Challenges for Dual-Capacity Partners

The new standard introduces uncertainty for partners who hold multiple roles, such as acting as both a general partner and a limited partner. It remains unclear how the “significant management” test applies to individuals who participate in management through one interest while receiving distributive shares through another. Whether the “as such” phrasing requires these interests to be evaluated independently remains an open question.

Outlook

The Fifth Circuit’s decision is binding in Louisiana, Mississippi, and Texas. However, the broader legal dispute remains unresolved in other circuits. In the First Circuit, Denham Capital Management LP v. Commissioner is still pending, and the Second Circuit is dealing with the Soroban case. If different circuits adopt conflicting standards, a Supreme Court review becomes increasingly likely.

For taxpayers, the takeaway is clear: limited liability is no longer a sufficient defense for self-employment tax, but active participation does not automatically disqualify a partner. The determining factor is now whether the partner’s role in managing the business is “significant.”

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