Written by Cam Pearce, Director of Tax Research & Education

A significant circuit court ruling has resolved a long-standing dispute over who qualifies as a "limited partner" for purposes of the self-employment tax exclusion under Sec. 1402(a)(13). Here's what you need to know. 

The Basics 

Under Sec. 1402(a)(13), a limited partner's distributive share of partnership income is generally excluded from net earnings from self-employment. The IRS and Tax Court had long interpreted "limited partner" to mean a passive investor — someone who doesn't actively participate in the business. Under that view, active limited partners could not claim the exclusion. 

The Fifth Circuit rejected that interpretation entirely. 

What the Court Decided 

In Sirius Solutions, L.L.L.P., the Fifth Circuit vacated the Tax Court's decision and held that a "limited partner" for purposes of Sec. 1402(a)(13) is simply a partner in a limited partnership who has limited liability — nothing more, nothing less. 

The court grounded its analysis in the plain meaning of the term at the time of the statute's enactment in 1977, consulting contemporaneous dictionaries and agency guidance. Every source pointed in the same direction: limited liability, not passive investor status, is the defining characteristic. The IRS's own Form 1065 instructions from 1978 onward defined limited partner based solely on limited liability, and the Social Security Administration adopted the same standard in a regulation that remains in effect today. 

Why the IRS's Position Failed 

The court identified three fatal flaws in the passive-investor interpretation. 

1. The statute itself contains a carve-out for guaranteed payments made to a partner for services rendered — language that would be entirely superfluous if limited partners were by definition passive and performed no services.  
2. Congress knew how to write "passive investor" into the tax code and chose not to.  
3. The passive-investor test required taxpayers to weigh an unwieldy number of factors, creating unnecessary complexity and inconsistency. 

What This Means in Practice 

The ruling creates a cleaner, more administrable rule: if a partner holds an interest in a limited partnership formed under state law and has limited liability under that state's statute, the exclusion applies to their distributive share — regardless of how actively they work in the business. Guaranteed payments for services, however, remain subject to self-employment tax. 

Planning Considerations 

This decision has meaningful implications for partnerships whose limited partners are active in operations. Structures that were previously exposed to self-employment tax under the passive-investor test may now qualify for the exclusion. Partners and their advisers should review existing arrangements in light of the ruling, particularly in professional services firms and consulting partnerships organized as limited liability limited partnerships. The IRS may seek further review or issue guidance in response, so monitoring developments remains important.