Tax Planning & Concepts
What Is K-1 Income and How Is It Taxed?
K-1 income is your share of a pass-through entity’s income, gains, losses, deductions, and credits, reported to you on Schedule K-1 by a partnership, S corporation, estate, or trust. It is taxed on your personal return, whether or not the entity paid you any cash. The character of each item (ordinary, passive, or portfolio) controls your rate, whether self-employment tax applies, and whether the income qualifies for the Section 199A QBI deduction.
The form itself is the reporting document. What matters for your tax bill is the mechanism behind it: the entity computes income once, then allocates it to owners who report it and pay the tax. For a line-by-line walkthrough of the boxes, see Schedule K-1 explained. This guide covers the taxation.
How Pass-Through Taxation Works
A pass-through entity pays no federal income tax at the entity level. Instead, it reports total income on an information return (Form 1065 for partnerships, Form 1120-S for S corporations) and passes each owner’s allocated share to them on a Schedule K-1. Owners report those amounts on their own returns and pay the tax at their individual rates.
The result is a single layer of tax, unlike a C corporation, where profit is taxed at the corporate level and again when distributed as dividends. Partnerships and S corporations are the two most common pass-throughs that issue K-1s. Trusts and estates issue Schedule K-1 (Form 1041) to beneficiaries.
Allocation follows the partnership agreement or the S corporation’s per-share, per-day rule, not the cash you actually took out. This distinction drives most of the surprises taxpayers hit with K-1 income. For the entity-level return, see Form 1065 explained.
Ordinary vs Passive vs Portfolio Income
K-1 income is not one thing. Each box carries a character that determines your tax rate and which rules apply. The three broad categories are ordinary business income, passive income, and portfolio income, and a single K-1 often reports all three across different boxes.
The character is set at the entity level and preserved as the item passes through to you. That is why a K-1 breaks a lump sum into many lines: a $9,000 gain taxed at long-term capital gains rates is treated very differently from $9,000 of ordinary business income.
| Income type | Typical K-1 box (1065) | How it is taxed | Notes |
|---|---|---|---|
| Ordinary business income | Box 1 | Ordinary rates; may be subject to self-employment tax | The entity’s operating profit |
| Net rental real estate | Box 2 | Ordinary rates, generally passive | Passive loss rules can limit deductions |
| Interest income | Box 5 | Ordinary rates (portfolio) | Not subject to SE tax |
| Ordinary and qualified dividends | Boxes 6a, 6b | Ordinary or preferential rates | Qualified dividends taxed like LTCG |
| Net long-term capital gain | Box 9a | Long-term capital gains rates | Preferential rates apply |
| Section 179 deduction | Box 12 | Reduces ordinary income | Limited at the owner level |
Passive income and losses follow the passive activity rules: losses from a passive activity generally offset only passive income, with the excess suspended until you have passive income or dispose of the activity. See passive activity loss rules for how those limits work. Most partnership income flows to Schedule E on your Form 1040; see Schedule E explained.
Self-Employment Tax on Partnership K-1s
Whether K-1 income triggers self-employment tax depends on the entity and your role. A general partner’s distributive share of ordinary business income (Box 1), plus guaranteed payments for services (Box 4), is generally subject to self-employment tax. A limited partner’s share is generally not, except for guaranteed payments.
Self-employment tax is 15.3%: 12.4% for Social Security on net earnings up to the wage base ($184,500 in 2026) and 2.9% for Medicare on all net earnings, with no cap. An additional 0.9% Medicare tax applies above $200,000 (single) or $250,000 (married filing jointly). The K-1 reports the amount subject to SE tax in Box 14, code A, which flows to Schedule SE.
S corporation shareholders are treated differently. A shareholder’s Box 1 ordinary income on a Form 1120-S K-1 is not subject to self-employment tax. Instead, the IRS requires shareholder-employees to take reasonable compensation as W-2 wages, which carry FICA tax. This split is why S corporations can reduce payroll taxes, and why the IRS scrutinizes low reasonable-comp figures. For the mechanics of the SE calculation, see self-employment tax explained.
QBI Deduction Eligibility
Most K-1 ordinary business income qualifies for the Section 199A qualified business income (QBI) deduction, which can deduct up to 20% of qualified business income. The Qualified Business Income Deduction Act made the deduction permanent under the OBBBA, and the entity reports the QBI details you need in Box 20 (partnerships) or Box 17 (S corporations), code Z.
Qualifying items generally include ordinary business income and net rental income treated as a trade or business. Items excluded from QBI include capital gains, dividends, and interest income not allocable to the business. Guaranteed payments to partners are also excluded from QBI, even though they are otherwise ordinary income.
Above the taxable income thresholds (approximately $201,775 for single filers and $403,550 for married filing jointly in 2026, indexed annually), two limits phase in: a wage and property (UBIA) limit, and a full phase-out for specified service trades or businesses such as law, accounting, health, and consulting. Below the thresholds, the full 20% is generally available. For how to claim it, see Form 8995 and the QBI deduction.
Phantom Income: Tax Owed With No Cash
You can owe tax on K-1 income even if the entity distributed no cash to you. Tax follows allocation, not distribution. If a partnership earns $100,000 and allocates $50,000 to each of two partners but reinvests the cash, each partner reports $50,000 and owes tax on it. This mismatch is called phantom income.
Phantom income is common in growth-stage partnerships, private equity and real estate funds, and any entity that retains earnings to fund operations or debt paydown. The partner faces a real tax bill with no cash from the entity to pay it.
Distributions themselves are generally not a second taxable event, because you were already taxed on the allocated income. A cash distribution is usually a tax-free return of basis, and it reduces your outside basis in the entity. A distribution that exceeds your basis is taxed as capital gain. Because basis governs whether losses are deductible and whether distributions are taxable, tracking it is essential. For S corporation owners, see Form 7203 and S corp shareholder basis.
Many partnership agreements address this risk with tax distributions, a required payout sized to cover the estimated tax on each partner’s allocated share. If yours does not, plan for estimated payments out of other funds.
Frequently Asked Questions
Is K-1 income taxable if I did not receive any money?
Yes. K-1 income is taxed on allocation, not distribution. If the entity allocates income to you, you report it and owe tax even if it kept the cash. This is called phantom income and is common in funds and growth-stage partnerships that reinvest earnings. Some partnership agreements require tax distributions to cover the resulting bill.
Is K-1 income subject to self-employment tax?
It depends. A general partner’s Box 1 ordinary income and guaranteed payments are generally subject to the 15.3% self-employment tax. A limited partner’s distributive share generally is not, apart from guaranteed payments. S corporation K-1 income is not subject to SE tax, but shareholder-employees must take reasonable W-2 compensation that carries FICA tax instead.
Does K-1 income qualify for the QBI deduction?
Often, yes. Ordinary business income and qualifying rental income reported on a K-1 generally count as qualified business income eligible for the Section 199A deduction of up to 20%. Capital gains, dividends, interest, and guaranteed payments are excluded. Above the 2026 income thresholds, wage, property, and specified-service limits may reduce or eliminate the deduction.
Where do I report K-1 income on my tax return?
Most partnership and S corporation K-1 income flows to Schedule E, Part II, of Form 1040, then to your total income. Capital gains go to Schedule D, and self-employment amounts go to Schedule SE. Each K-1 box maps to a specific line, so the character of the income (ordinary, passive, or portfolio) determines where it lands and how it is taxed.
What is the difference between K-1 income and a distribution?
K-1 income is your allocated share of the entity’s taxable results, taxed whether or not you receive cash. A distribution is the cash or property actually paid to you. Distributions are generally not taxed again, because the underlying income was already taxed; instead they reduce your basis. A distribution above your basis is taxed as capital gain.
When will I receive my Schedule K-1?
Partnerships and S corporations must furnish K-1s by the entity return deadline, generally March 15 for calendar-year filers, or September 15 if the entity filed a six-month extension. Late K-1s are common, which is why many K-1 recipients file their own extensions. You still owe any estimated tax by the April deadline regardless of when the K-1 arrives.
Reviewed by The Ledgerism Editorial Team. Last reviewed: July 2026.