The partner type on a K-1 is set in Part II, Item E of Schedule K-1 (Form 1065), where the partnership checks one of three boxes: General Partner or LLC Member-Manager, Limited Partner or Other LLC Member, or LLC Member.1Internal Revenue Service. Schedule K-1 (Form 1065) – Partner’s Share of Income, Deductions, Credits, etc. That single checkbox drives two of the biggest tax questions you’ll face as a partner: whether you owe self-employment tax on your share of business income, and whether your losses are passive or nonpassive.
Where to Look on the K-1
Open your K-1 and go to Part II. Item E identifies you as the partner and shows the classification the partnership assigned.2Internal Revenue Service. Instructions for Form 1065 The check reflects both the legal form of the entity and the role you play inside it. If the box looks wrong given what you actually do in the business, that’s worth raising with the partnership before you file, because the downstream tax consequences follow the check.
What Each Partner Type Means
Three boxes, three different tax profiles.
General partner. You’re in a General Partnership, or you’re the general partner of a Limited Partnership. You bear personal liability for the entity’s debts and typically manage the business.
Limited partner. You’re in a Limited Partnership, and your liability is capped at what you invested. You’re a passive investor rather than someone running day-to-day operations.
LLC member. The entity is a Limited Liability Company taxed as a partnership (by election or default). Your treatment for tax purposes depends on whether you actively manage the LLC or hold your interest as a passive investor.
The LLC member box causes the most confusion. State law doesn’t split LLC owners into “general” and “limited” partners, but the IRS still needs to decide which of the two profiles fits you. Manage the LLC or work in the business, and you’re generally treated like a general partner. Sit back as a hands-off investor, and you look more like a limited partner. The partnership should check the sub-box that matches, though getting it right sometimes takes a real look at what you do all day.
Self-Employment Tax Follows the Classification
This is where the box matters most in dollars. Self-employment tax runs 15.3% (12.4% Social Security up to the annual wage base, plus 2.9% Medicare on all earnings with no cap).3Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) On a large distributive share, that’s a serious bill, and whether you owe it turns directly on which box is checked.
General Partners and Active LLC Members
If your K-1 shows you as a general partner or as an active LLC member-manager, your ordinary business income in Box 1 is subject to SE tax. The IRS treats that income as compensation for your active involvement, similar to wages, even though it arrives on a K-1 rather than a W-2.4Internal Revenue Service. Self-Employment Tax and Partners Any guaranteed payments for services in Box 4a are also SE-taxable on top of your distributive share.
Limited Partners
Limited partners get a statutory break. Section 1402(a)(13) excludes a limited partner’s distributive share of partnership income from self-employment tax.5Office of the Law Revision Counsel. 26 U.S. Code 1402 – Definitions The logic: a limited partner puts up capital rather than labor, so the return looks more like investment income than wages. Guaranteed payments for services (Box 4a) are still SE-taxable, however, because those payments compensate specific work no matter how the partner is classified.4Internal Revenue Service. Self-Employment Tax and Partners
The Additional Medicare Tax
Partners whose SE income clears certain thresholds also owe the 0.9% Additional Medicare Tax. Thresholds are $200,000 for single filers and $250,000 for married joint filers. It stacks on top of the regular 2.9% Medicare portion, bringing the effective Medicare rate to 3.8% on income above the threshold.6Internal Revenue Service. Questions and Answers for the Additional Medicare Tax W-2 wages count toward the threshold first, which can pull K-1 income into the additional tax zone sooner than expected.
When the Limited Partner Label Doesn’t Hold Up
The SE tax break for limited partners has become increasingly contested. The IRS and the Tax Court don’t take a state-law label at face value. In Soroban Capital Partners LP (T.C. Memo. 2025-52), the Tax Court applied a functional test, examining whether limited partners actually behaved like passive investors or were limited partners in name only. The court looked at their roles in generating income, the time they devoted to the business, and whether their distributive shares really represented returns on invested capital or compensation for skill and judgment.
The court found that Soroban’s limited partners actively managed the business, their time and expertise were essential to operations, and their capital contributions were insignificant relative to their income allocations. The full distributive share was subject to SE tax despite the “limited partner” box on the K-1s.
The practical takeaway. If your K-1 classifies you as a limited partner but you spend meaningful time working in the business, making management decisions, or generating revenue through personal effort, Section 1402(a)(13) may not protect you. LLC members face the same scrutiny. Checking the “LLC Member” box doesn’t shield you from SE tax if you’re functionally running the business.
Passive or Nonpassive: The Other Consequence of the Box
Your classification also decides whether the income and losses on your K-1 are passive or nonpassive. That matters most when you have losses. Under Section 469, passive losses can only offset passive income, not wages or active business profits.
Limited partners face a near-automatic presumption of passivity. The statute provides that no interest in a limited partnership held as a limited partner is treated as an interest in which the taxpayer materially participates.7Office of the Law Revision Counsel. 26 U.S. Code 469 – Passive Activity Losses and Credits Limited A limited partner can overcome the presumption only by meeting one of three narrow material participation tests: participating more than 500 hours, constituting substantially all participation, or having participated materially in five of the last ten years.8Internal Revenue Service. Instructions for Form 8582, Passive Activity Loss Limitations
General partners have an easier path. Their losses are nonpassive if they materially participate, and material participation can be established through any of the seven standard tests, most commonly 500+ hours during the year. Nonpassive losses can offset wages, interest, and other active income.
When a loss is passive and you don’t have enough passive income elsewhere to absorb it, the loss is suspended. Suspended passive losses carry forward indefinitely and become fully deductible when you dispose of your entire interest in the partnership in a taxable transaction. Until then, those losses sit unused. That’s why the passive/nonpassive result of your Item E box has real money on the line.
Three Filters Every Partnership Loss Has to Clear
If your K-1 shows a loss in Box 1, don’t assume you can deduct the full number. Partnership losses run through three filters, in this order, before they reduce taxable income.
Basis limitation. You can’t deduct losses beyond your adjusted basis in the partnership. Basis starts with your capital contribution and increases with income allocations and additional contributions. It decreases with losses, distributions, and nondeductible expenses. Zero basis means the loss is suspended until you have basis again from new contributions or income.
At-risk limitation. Even with enough basis, your deductible loss is capped at the amount you have at risk in the activity. You’re at risk for cash and property you contributed plus amounts you personally borrowed for the activity. Nonrecourse debt (loans where the lender can’t come after you personally) generally doesn’t count, unless it’s qualified nonrecourse financing secured by real property. Losses blocked here go on Form 6198 and carry forward.9Internal Revenue Service. Instructions for Form 6198, At-Risk Limitations
Passive activity limitation. Losses that survive the first two filters still have to pass the passive activity rules driven by your partner type. Passive losses can only offset passive income; excess passive losses are suspended and reported on Form 8582.10Internal Revenue Service. About Form 8582, Passive Activity Loss Limitations
The order matters. A loss blocked at basis never reaches at-risk, and a loss blocked at at-risk never reaches the passive rules. Each filter has its own carryforward, so tracking where a suspended loss sits will matter in later years when you may have basis, at-risk amounts, or passive income to absorb it.
How the Classification Shows Up on Your Return
The partner type box determines which lines and schedules your K-1 numbers land on.
Box 1: Ordinary Business Income or Loss
Box 1 is the operating result allocated to you, and it goes on Schedule E, Part II. If the income is nonpassive (general partner materially participating), it flows to the income column directly. If it’s passive, or if a loss is subject to the passive activity rules, you run it through Form 8582 first and report only the allowable amount on Schedule E.11Internal Revenue Service. 2025 Partner’s Instructions for Schedule K-1 (Form 1065) For general partners and active LLC members, Box 1 also gets picked up on Schedule SE for the SE tax calculation.
Box 4a: Guaranteed Payments for Services
Guaranteed payments compensate a partner for services or capital regardless of partnership profitability. Payments for services are SE-taxable for every partner type, including limited partners.4Internal Revenue Service. Self-Employment Tax and Partners They go on Schedule SE alongside any other SE-taxable amounts.
Box 19: Distributions
Distributions themselves aren’t reported as separate income. A cash distribution is not taxable unless it exceeds your adjusted basis in the partnership interest.12Office of the Law Revision Counsel. 26 U.S. Code 731 – Extent of Recognition of Gain or Loss on Distribution Excess is taxable as capital gain. The partnership doesn’t track your outside basis for you, so a running basis schedule of your own is what keeps that gain from showing up as an unwelcome surprise.