Fifth Circuit Ruling Shields Limited Partners From Self-Employment Tax, Rejecting IRS Test

NEW ORLEANS — A federal appeals court on January 16, 2026, delivered a significant victory to partners in limited partnerships, ruling that their state-law legal status, not their active involvement in the business, determines whether they are exempt from self-employment taxes on their share of partnership income. The decision by the U.S. Court of Appeals for the Fifth Circuit in Sirius Solutions, L.L.L.P. v. Commissioner vacated a U.S. Tax Court opinion and rejected the Internal Revenue Service’s long-standing “functional analysis” test for defining a limited partner.

This ruling creates a significant, but geographically limited, planning opportunity. For years, the IRS has aggressively pursued active partners in various limited partnership structures. While this decision provides a clear, bright-line test in the Fifth Circuit, it simultaneously deepens the divide for businesses operating elsewhere.

The case centered on Sirius Solutions, a consulting firm structured as a Delaware limited liability limited partnership (LLLP). The firm excluded the distributive income shares of its individual limited partners from net earnings for self-employment tax purposes. The IRS challenged this position, arguing the partners were actively involved in the business and therefore did not qualify for the limited partner exception under Internal Revenue Code Section 1402(a)(13). The agency issued Notices of Final Partnership Administrative Adjustment, seeking to increase Sirius’s net earnings from self-employment by over $5.9 million for 2014 and over $7.3 million for 2015.

At the heart of the dispute is the definition of “limited partner.” The term is not explicitly defined in the tax code, which was written decades before the rise of modern business structures like LLCs and LLLPs. The IRS and the Tax Court have historically argued for a functional test, examining the roles and management participation of the partners to determine if they are truly passive investors deserving of the tax exemption. Following its own 2023 precedent in Soroban Capital Partners v. Commissioner, the Tax Court sided with the IRS, concluding the Sirius partners were not “limited partners, as such” because of their active roles.

However, the Fifth Circuit panel found no textual basis in the statute for such a fact-intensive inquiry. The court’s majority opinion stated that the plain meaning of the term, supported by legal dictionaries and even the IRS’s own Form 1065 instructions, points to an individual’s legal status and liability under state law. The court reasoned that if a partner is designated as a limited partner in a state-law limited partnership and has limited liability, they qualify for the exception. The ruling effectively creates a bright-line test based on legal structure rather than day-to-day activities.

The ambiguity around the “limited partner” exception has been a major headache for service partnerships and investment funds. The IRS's functional test forced a costly analysis of every partner's activities. The Fifth Circuit's focus on state-law liability simplifies matters for those under its jurisdiction, but it also underscores the critical importance of proper entity selection. This is precisely the type of complex scenario where our tax preparation and compliance services are essential. Proactive structuring can prevent these costly disputes before an audit begins. For guidance on these evolving rules, business owners can contact C&S Finance Group LLC at csfinancegroup.com.

The immediate impact of the decision is a substantial tax benefit for qualifying partnerships within the Fifth Circuit’s jurisdiction, which covers Texas, Louisiana, and Mississippi. For partners in these states, the ruling could shield their distributive income from the 15.3% self-employment tax, which covers Social Security and Medicare contributions. This is particularly relevant for service partnerships, such as consulting, law, and accounting firms, where partners are often both owners and active participants.

For businesses outside the Fifth Circuit, the ruling introduces more uncertainty. The IRS is likely to continue applying its functional test in other jurisdictions, creating a split among the federal circuit courts. Legal experts suggest the agency will likely seek out a favorable ruling in another circuit to tee up the issue for an ultimate decision by the U.S. Supreme Court. Until then, partnerships in the rest of the country remain subject to the IRS’s more stringent interpretation and the risk of audits and litigation over the issue.

We caution clients outside of Texas, Louisiana, and Mississippi against restructuring based solely on this news. The IRS will likely challenge this interpretation in other circuits, meaning this is the beginning, not the end, of this tax battle.

The Fifth Circuit has now vacated the Tax Court's decision and remanded the case for further proceedings consistent with its new interpretation. The focus now shifts to the IRS and its response. The agency could petition for a rehearing by the full Fifth Circuit or may choose to litigate the issue in a different appellate court, hoping to create a circuit split that would attract Supreme Court review for a final, nationwide resolution.