A taxpayer win withdrawn: the 5th Circuit's new limited-partner self-employment test

The substituted opinion is narrower than the one it replaced, and that is the part worth pricing. In January the 5th Circuit's answer was structural: for a state-law limited partnership, limited liability was the characteristic that earned the exclusion in Section 1402(a)(13), and the panel vacated the Tax Court's decision and sent the case back ^[2]. That is a test a partnership can satisfy with its formation documents. The August 12 replacement, according to CPA Practice Advisor, asks whether the partner played a significant role in managing or running the business ^[3]. Facts-and-circumstances questions are resolved in examination, not at formation.

Which puts the new standard uncomfortably close to what the Tax Court was already doing. Its functional analysis looks past a partner's state-law title to what the partner actually did, on the reasoning that Congress wrote the exclusion for passive investors ^[10], and in Soroban in 2023 the Tax Court held that formal limited-partner status alone did not settle the question ^[11]. A fund principal who loses under that analysis has no obvious reason to expect a different result under a test keyed to running the business. The partners who gain are the ones who were closest to winning anyway.

The money still justifies the file review. Distributive shares from a partnership's trade or business default into net earnings from self-employment ^[17], taxed at 15.3% ^[1], and the publisher puts potential savings for affected clients in the tens or hundreds of thousands of dollars ^[6]. Run that backwards: $200,000 of self-employment tax at 15.3% implies roughly $1.3 million of distributive share ^[15]. This is a question for partnerships with large per-partner allocations, not a general planning item.

The timing is the operational problem. The controlling standard changed 34 days before the September 15 partnership deadline and 64 days before the October 15 individual deadline ^[13], after the taxpayer-friendly version had stood for about seven months ^[16] and, presumably, after a good many K-1s had been drafted against it. Prior years and the current year are different decisions with different risk profiles. An amended prior-year return is a refund claim the government can contest while the clock on the refund statute runs down ^[7]. A current-year exclusion is a position that sits on a filed return through an examination cycle in which the governing test has already moved twice.

Geography narrows it further. The opinion binds Texas, Louisiana and Mississippi ^[4], with separate cases carrying implications for seven other states and Puerto Rico ^[12], so ten states plus Puerto Rico have live exposure and only three have an answer ^[14]. And one small hazard for anyone searching: the case is now K Alain LLLP v. Commissioner, because the partnership renamed itself this year ^[8]. Workpapers and research trails that point at Sirius Solutions will not find it.

One caution on the source. This account comes from a single trade publication, and the statutory text it rests on says only that the exclusion covers "a limited partner, as such," other than guaranteed payments for services, without defining the term ^[9]. The precise wording of the substituted standard matters more than the summary of it, and anyone taking a position should be reading the opinion rather than the coverage.