For nearly three decades, the IRS has told limited partners the same thing: your state-law liability shield doesn't matter if you're doing real work for the partnership. Show up to meetings, sign contracts, manage a team — and the agency would argue your "limited partner" status was a fiction for self-employment tax purposes, no matter what your partnership agreement said.
On January 16, 2026, the Fifth Circuit Court of Appeals told the IRS it had been reading the statute wrong the whole time.
The case is Sirius Solutions, L.L.L.P. v. Commissioner, and it just rewrote the rules for how owners of state-law limited partnerships calculate self-employment tax — while leaving a very important group of business owners (LLC members) explicitly out in the cold, at least for now.
Why self-employment tax on partnership income is such a fight
Self-employment tax (SECA) is the 15.3% combination of Social Security and Medicare tax that partners pay on their "net earnings from self-employment," on top of regular income tax. For a general partner actively running a business, that's uncontroversial — it's the partnership equivalent of payroll tax.
But Congress carved out an exception in 1977: under Internal Revenue Code Section 1402(a)(13), a limited partner's distributive share of partnership income is excluded from SECA, except for guaranteed payments for services actually rendered. The idea, at the time, was that limited partners were passive investors — closer to shareholders than to workers — so their share of profits shouldn't be treated like self-employment income.
The problem: the statute never defined "limited partner." For decades the IRS leaned on that gap to argue for a functional test — look past the state-law label and ask whether the partner was actually "limited" in the sense of being passive. If you were an active, revenue-generating professional (a consultant, a fund manager, a service-firm partner) who happened to hold a limited partner interest, the IRS's position was that you didn't get the exemption, full stop.
That functional test won repeatedly at the Tax Court, most visibly in the Soroban Capital Partners line of cases against hedge fund managers, where the Tax Court held that limited partners who were actively involved in managing the business couldn't claim the exemption regardless of their formal state-law status. Multiple funds and consulting firms — and their partners — paid seven- and eight-figure self-employment tax bills, or fought the IRS in court, on that theory.
What happened in Sirius Solutions
Sirius Solutions, LLLP is a business-consulting firm structured as a Texas limited liability limited partnership. For the 2014–2016 tax years, it excluded its limited partners' distributive shares of partnership income from net earnings from self-employment, relying on the Section 1402(a)(13) exception. The IRS disagreed, applying its usual functional/passive-investor analysis, and the Tax Court sided with the IRS.
Sirius appealed to the Fifth Circuit — and won, decisively. The panel rejected the IRS's functional test outright, holding that "limited partner" under Section 1402(a)(13) means exactly what it means under state partnership law: a partner in a limited partnership who holds limited liability. Not "passive." Not "non-managing." Just: does state law protect this partner from the entity's debts the way a limited partner is protected?
The court leaned on several converging signals — the plain dictionary meaning of "limited partner," the IRS's own Form 1065 instructions (which had defined limited partner by state-law status for over 40 years), and Social Security Administration regulations that used the same state-law framing. All of it pointed the same direction: limited liability under state law, not day-to-day involvement, is what triggers the exemption.
Guaranteed payments for services are still carved back out — a limited partner who's paid a salary-like guaranteed payment for work performed still owes SECA tax on that portion. The exemption only reaches the distributive share received in the partner's capacity as a limited partner.
The catch: this doesn't (yet) cover LLCs
Here's the part every LLC owner reading the headlines needs to catch: the Fifth Circuit's opinion is expressly limited to state-law limited partnerships. It says nothing about LLC members or LLP partners, and several of the professional alerts covering the case note the court reserved that question entirely. If your business is organized as an LLC — the most common structure for small businesses, freelancers, and solo consultants who read this blog — you cannot yet point to Sirius Solutions and assume the same exemption applies to your K-1 income. That extension, if it comes, will need its own litigation.
It's also a regional win for now. The ruling binds only the Fifth Circuit — Texas, Louisiana, and Mississippi. The Tax Court's pro-IRS functional-test cases are still working their way through appeals in the First and Second Circuits, and commentary on the case widely expects a circuit split, with the possibility of Supreme Court review down the line. The IRS could also seek rehearing en banc, or simply continue applying its functional test to taxpayers outside the Fifth Circuit through formal nonacquiescence.
What this means if you're a limited partner
If you hold a genuine limited partner interest in a state-law limited partnership (not an LLC or LLP interest, and not a general partnership interest), and you've been paying self-employment tax on your distributive share because you were "too active" under the IRS's old functional test:
- You may have a refund claim — but the clock is running. Refund claims generally must be filed within three years of the original return's filing date, so a 2014 return is likely already out of reach, while more recent years may still be open. This is exactly the kind of calculation where you want a tax professional running the actual dates on your filings, not a blog post.
- Jurisdiction matters. The strongest argument right now applies inside the Fifth Circuit. Outside it, the IRS is very likely to keep asserting its functional test, meaning a refund claim elsewhere may turn into a dispute rather than a straightforward check.
- Separate guaranteed payments from distributive share, cleanly. The exemption never covered guaranteed payments for services — only the passive-capacity distributive share. If your partnership's books blur the two, you'll struggle to substantiate any exemption claim, refund or otherwise.
That last point is where good bookkeeping stops being a compliance chore and starts being the difference between a clean refund claim and an IRS fight you can't win on the facts. If a partnership's general ledger doesn't cleanly distinguish "guaranteed payment for services rendered" from "distributive share of partnership income," reconstructing that split for a prior tax year — under audit, with the IRS on the other side of the table — is painful and often impossible to do convincingly after the fact.
Keep the paper trail clean from day one
This case is a good reminder of a broader truth in partnership and LLC accounting: the IRS's theories about how your income should be characterized can change, courts can reverse decades of precedent, and refund windows are short. The businesses best positioned to take advantage of a ruling like Sirius Solutions are the ones whose books already separated guaranteed payments from distributive shares, by partner, by year — not the ones scrambling to reconstruct it from bank statements after the fact.
Beancount.io gives partnerships and LLCs plain-text, version-controlled accounting where every guaranteed payment and every distributive allocation lives in its own auditable ledger entry — no black box, no vendor lock-in, and a complete history you can hand straight to your accountant when a court decision like this one changes what's worth claiming. Get started for free and keep your partnership's records ready for whatever the next circuit split brings.