A partner’s share in a partnership is not one number but three: your capital interest (your slice of the net assets if the business liquidated), your profit-and-loss interest (the percentage used to allocate taxable income and loss to your K-1), and your share of partnership liabilities (which feeds your tax basis and the losses you can deduct). All three are set primarily by the partnership agreement, all three can differ from each other, and each one drives a different tax result on your personal return.
The Three Interests Behind a Single “Share”
Most people think of a partnership interest as a single ownership percentage. The IRS tracks three.
- Your capital interest is your ownership stake in the partnership’s net assets. If the partnership liquidated tomorrow and sold everything at fair market value, your capital interest determines the slice you would receive after debts were paid.
- Your profit-and-loss interest is the percentage used to allocate the partnership’s taxable income or loss to you each year. This is what shows up on your Schedule K-1 and directly hits your personal tax return.
- Your liability interest is your share of the partnership’s debt. It factors into your tax basis and determines how much loss you can deduct.
The Schedule K-1 that every partner receives reports beginning and ending percentages for profit, loss, and capital separately.1Internal Revenue Service. Schedule K-1 (Form 1065) – Partners Share of Income, Deductions, Credits, etc. These interests are separate from any voting or management rights you hold. A partner with a 50% profit interest might have a 10% vote, or no vote at all if the agreement says so.
How the Partnership Agreement Sets Your Share
The partnership agreement (or the operating agreement for an LLC taxed as a partnership) is the document that determines almost everything about your share. It spells out how contributions are valued, how profits and losses are split, how distributions are made, and what happens when a partner leaves.
Under federal tax law, the partnership can allocate income and losses in almost any proportion the partners agree to, as long as those allocations have what the tax code calls “substantial economic effect.” If an allocation fails that standard, the IRS recharacterizes it based on the partner’s actual economic interest in the partnership, taking into account all facts and circumstances.2Office of the Law Revision Counsel. 26 USC 704 – Partners Distributive Share The rule prevents partners from shifting income or losses purely to reduce taxes without bearing real economic risk.
When the agreement says nothing about how to divide profits, most states follow the Uniform Partnership Act’s default: partners share equally, regardless of how much capital each one contributed. That surprises people who assume a bigger check automatically buys a bigger share. Get the agreement right before money moves.
How Partnership Debt Changes Your Share
Your share of partnership liabilities increases your tax basis, which in turn increases the losses you can deduct. The reverse also holds. When the partnership pays down debt or your share of it decreases, the tax code treats that reduction as if the partnership had distributed cash to you.3Office of the Law Revision Counsel. 26 US Code 752 – Treatment of Certain Liabilities
How debt gets divided depends on whether the loan is recourse or nonrecourse. Recourse debt is allocated to the partner (or partners) who would bear the economic loss if the partnership couldn’t pay. In practice, that usually means general partners. Nonrecourse debt, where no partner is personally on the hook, is allocated by each partner’s share of partnership profits.4Internal Revenue Service. Recourse vs Nonrecourse Liabilities The distinction matters most for limited partners and passive investors, whose ability to deduct losses often hinges on how much debt they can include in basis.
Not every obligation qualifies. An obligation counts as a partnership liability for basis purposes only if incurring it creates or increases the basis of an asset, gives rise to an immediate deduction, or produces an expense that is neither deductible nor chargeable to capital. For cash-basis partnerships, ordinary accounts payable do not qualify.4Internal Revenue Service. Recourse vs Nonrecourse Liabilities
Outside Basis: The Running Tally of Your Share
Your outside basis is a running scoreboard of your tax investment in the partnership. It starts with your initial contribution (cash, or the fair market value of property you put in), and adjusts each year based on what happens inside the business.5Internal Revenue Service. Partners Outside Basis
Basis goes up by your share of partnership income (both taxable and tax-exempt), additional contributions, and increases in your share of partnership liabilities. It goes down by your share of losses and deductions, distributions of cash or property to you, and decreases in your share of liabilities.
Tracking this number is not optional. Your outside basis determines the tax treatment of every distribution you receive and caps the losses you can deduct. Losing track almost always ends in overpaying taxes or claiming deductions you weren’t entitled to.
Allocations Versus Distributions
The gap between an allocation and a distribution is the gap between owing tax and receiving cash. An allocation is the share of the partnership’s income or loss assigned to you on your K-1. You owe tax on allocated income whether or not you received a dime. That is the “phantom income” problem, and it is one of the most common complaints partners raise.
A distribution is an actual withdrawal of cash or property. Distributions are generally tax-free up to your outside basis, because you have already been taxed on the income that built that basis up. You reduce your basis by the distribution amount. If a cash distribution exceeds your outside basis, the excess is taxed as a capital gain.6Internal Revenue Service. Liquidating Distributions of a Partners Interest in a Partnership
A quick example makes it concrete. You could be allocated $100,000 of partnership income, owe tax on all of it, and receive only $20,000 in cash. The $20,000 is tax-free (it reduces your basis), but you still owe income tax on the full $100,000. The next year, the partnership could distribute $80,000 to you with zero income allocation, and that distribution would also be tax-free as long as basis covers it.
Three Layers of Loss Limits on Your Share
When the partnership allocates you a loss, you cannot always deduct it. The tax code sets three separate hurdles, and you have to clear each one in order.
Basis Limitation
Your deductible share of partnership losses cannot exceed your outside basis at the end of the partnership’s tax year. Any excess is suspended and becomes deductible in a future year when basis is restored through additional contributions, income allocations, or an increased share of liabilities.2Office of the Law Revision Counsel. 26 USC 704 – Partners Distributive Share
At-Risk Limitation
Even with enough basis, you can only deduct losses to the extent you are personally at risk in the activity. You are at risk for cash and property you have contributed, plus borrowed amounts for which you are personally liable or have pledged non-activity property as security. You are not at risk for amounts protected by guarantees, stop-loss agreements, or nonrecourse financing, with a carve-out for qualified nonrecourse debt on real property. Blocked losses carry forward.7Office of the Law Revision Counsel. 26 US Code 465 – Deductions Limited to Amount at Risk
Passive Activity Limitation
The last hurdle applies if you do not materially participate in the business. Passive losses can only offset passive income, not your wages or investment income. This is where most limited partners and silent investors get tripped up. If you have no other passive income, your allocated losses are suspended until you either generate passive income or dispose of your entire interest.8Office of the Law Revision Counsel. 26 US Code 469 – Passive Activity Losses and Credits Limited
The tests apply in sequence. A loss that clears basis can still be blocked at at-risk, and a loss that clears both can still be suspended by the passive activity rules.
Self-Employment Tax on Your Share
If you are a general partner or an LLC member who actively participates in the business, your share of ordinary business income is subject to self-employment tax covering Social Security and Medicare. The combined rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.9Internal Revenue Service. Topic No 554, Self-Employment Tax Any guaranteed payments you receive for services are also subject to self-employment tax.10Internal Revenue Service. Self-Employment Tax and Partners
An additional 0.9% Medicare surtax kicks in once self-employment income exceeds $200,000 (single) or $250,000 (married filing jointly). Those thresholds are not indexed for inflation.11Internal Revenue Service. Questions and Answers for the Additional Medicare Tax
Limited partners get a meaningful break. Their share of ordinary business income is excluded from self-employment tax. They owe it only on guaranteed payments for services they actually performed.10Internal Revenue Service. Self-Employment Tax and Partners The line between “limited partner” and “active LLC member” for self-employment tax purposes remains one of the murkier corners of partnership tax law, and the IRS has been working toward clearer guidance for years without fully resolving it.
Qualified Business Income Deduction on Your Share
Partners who receive ordinary business income from the partnership may qualify for a deduction of up to 20% of that income under Section 199A. The One Big Beautiful Bill Act, signed into law in July 2025, made the deduction permanent starting with the 2026 tax year and adjusted the income thresholds.
For 2026, the deduction begins to phase out for single filers with taxable income around $200,000 and for married couples filing jointly around $400,000. The phase-out ranges are approximately $75,000 for single filers and $150,000 for joint filers. Above the range, the deduction is limited based on W-2 wages paid by the business and the value of its depreciable property. Partners in specified service businesses like law, accounting, and consulting lose the deduction entirely above the phase-out range.
A new feature for 2026: a $400 minimum deduction is available if your qualified business income exceeds $1,000 and you materially participate. The partnership income flows through on your K-1, and you claim the deduction on your personal return.
Transfer Restrictions on Your Interest
Partnership agreements commonly restrict your ability to sell or transfer your interest. Typical provisions include a right of first refusal, which lets the other partners or the partnership buy your interest before you sell to an outsider, and consent requirements that let the remaining partners block a transfer they consider harmful. Many agreements also include buy-sell provisions triggered by death, disability, or divorce, setting a predetermined method for valuing and purchasing a departing partner’s interest.
What Lands on Your K-1
Every year, the partnership files Form 1065 and issues each partner a Schedule K-1 reporting their share of the partnership’s tax items. The K-1 does not report a single income number. It separately states ordinary business income, guaranteed payments, interest, dividends, royalties, capital gains and losses, rental income, Section 179 deductions, self-employment earnings, credits, tax-exempt income, and distributions, among other items.1Internal Revenue Service. Schedule K-1 (Form 1065) – Partners Share of Income, Deductions, Credits, etc. Each item flows to a different place on your personal return and may face different rates or limitations.
The K-1 also reports your beginning and ending percentages for profit, loss, and capital, your share of liabilities (broken out by recourse, nonrecourse, and qualified nonrecourse), and your beginning and ending capital account balances. That information is what you need to compute your outside basis. The K-1 itself does not calculate basis for you. That job is yours.