Fifth Circuit Overturns Prior Ruling on Limited Partner Self-Employment Tax Exception

On August 12, 2026, the U.S. Court of Appeals for the Fifth Circuit withdrew its January ruling in Sirius Solutions, L.L.L.P. v. Commissioner and issued a substitute opinion now titled K Alain L.L.L.P. v. Commissioner. The panel rejected the earlier view that a limited partner was defined solely by state-law status and limited liability, adopting instead a test that the partner must play no significant role in managing or running the partnership.

The decision also nullified the Tax Court’s earlier judgment and remanded the matter for the court to apply the new management-based standard. The court’s analysis drew on the original 1977 intent of section 1402(a)(13) and contemporary legal references, rejecting both the bright-line liability rule and the Tax Court’s passive-investor test. The ruling creates uncertainty for partners who hold dual interests, as the court did not clarify how the new test applies when a person is both a general and limited partner. The Fifth Circuit’s interpretation will bind federal courts in Louisiana, Mississippi and Texas, while other circuits continue to grapple with the issue, potentially setting the stage for a Supreme Court review.