What Is a Schedule K-1? The Small Business Owner's Guide

A Schedule K-1 is the tax form that tells you your share of a business's income, deductions, and credits when the business itself does not pay income tax. Partnerships, S corporations, and trusts pass their results through to the people behind them. The entity files its own return, then hands each owner or beneficiary a K-1 reporting their slice, and that slice goes on their personal Form 1040. If you own part of a multi-member LLC, hold shares in an S corporation, or received money from a trust or estate, a K-1 is how the numbers reach your return.

The IRS puts it plainly for partnerships: a partnership "files an information return to report their income, gains, losses, deductions, credits, etc.," and the partnership itself does not pay the tax, because profits and losses pass through to the partners who report them on their own returns (IRS, About Form 1065). The K-1 is the document that carries each person's share out of the business and onto their 1040.

What Is a Schedule K-1?

A Schedule K-1 reports one owner's share of a pass-through entity's tax items for the year. "Pass-through" means the business is not taxed on its profit. Instead the profit flows to the owners in proportion to what they own, and each owner pays tax on their share whether or not any cash was distributed. That last point surprises people. You can owe tax on K-1 income the business kept and reinvested, because the tax follows the profit, not the payout.

The entity prepares one K-1 per owner. It files a copy with the IRS attached to its own return and gives a copy to the owner. For an S corporation, the shareholder's K-1 reports "your share of the corporation's income, deductions, credits, etc.," and you generally keep it for your records rather than attaching it to your personal return (IRS, Shareholder's Instructions for Schedule K-1 (Form 1120-S)). The one common exception is backup withholding, which does get attached.

A K-1 is not a 1099. A 1099-NEC reports what a client paid you as an independent contractor. A K-1 reports your ownership stake in a business's whole year of results, income and deductions and credits, not a single payment. If you are a sole proprietor with no partners, you do not get a K-1 at all. Your business income goes straight on a Schedule C instead.

The Three Types of Schedule K-1

There is no single K-1. Three different forms share the name, one for each kind of pass-through entity, and the one you get depends on how the business is structured.

The partnership version covers general partnerships, limited partnerships, and the multi-member LLCs that most small partnerships are. The S corporation version goes to shareholders of a corporation or LLC that elected S status. The estate and trust version is the one you receive after inheriting, when a trust or estate distributes taxable income; the IRS describes it as the form used "to report a beneficiary's share of the estate's or trust's income, credits, deductions, etc." (IRS, About Form 1041). Partnership and S corporation income is the kind a working business owner deals with year after year, so the rest of this guide focuses there.

How to Read the Boxes That Matter

A Schedule K-1 (Form 1065) is split into three parts. Part I names the partnership. Part II describes you: Item G marks whether you are a "general partner or LLC member-manager" or a "limited partner or other LLC member," and Item J shows your percentage share of profit, loss, and capital. Part III is the money, and most of it is blank for a typical small business. A handful of boxes carry the weight.

Box 1 is where you look first. Picture a two-person LLC taxed as a partnership, owned 50/50. It takes in $300,000 and deducts $180,000 of business expenses, leaving $120,000 of ordinary business income. Each partner's K-1 shows $60,000 in Box 1, half of the total. Every dollar of deductible expense the business recorded during the year lowered that $120,000, which is why the records behind Box 1 matter as much as the box itself.

The Section 199A information in Box 20 is worth finding. It carries the numbers you need for the qualified business income (QBI) deduction, which can shave up to 20% off your pass-through income. On a $60,000 share, that is up to a $12,000 deduction, figured on Form 8995 if your 2025 taxable income before the deduction is at or below $197,300 ($394,600 if married filing jointly). The partnership reports the figure with code Z and an attached statement; it does not take the deduction itself. You do, on your own return.

How K-1 Income Lands on Your 1040

Your K-1 income does not go on a line of its own. It flows through Schedule E, the form the IRS uses to report "income or loss from rental real estate, royalties, partnerships, S corporations" and similar sources (IRS, About Schedule E). Box 1 ordinary business income lands in Part II of Schedule E, and the total carries to your Form 1040.

Self-employment tax is where partnerships and S corporations part ways. A general partner's share of ordinary business income is self-employment earnings, shown in Box 14, and it flows to Schedule SE where you pay the 15.3% self-employment tax on it. A limited partner's share is generally not, under section 1402(a)(13). S corporation income works differently again: "Unlike most partnership income, S corporation income isn't self-employment income and isn't subject to self-employment tax" (IRS, Shareholder's Instructions for Schedule K-1 (Form 1120-S)). S corporation owners pay themselves a reasonable salary through payroll instead, and only that salary carries employment tax. The entity you pick changes the tax on the same profit, which is one reason the sole proprietor, LLC, and S corp choice is worth thinking through.

Because no one withholds tax on K-1 income, you usually cover it yourself through quarterly estimated taxes. A profitable first year as a partner can leave you with a tax bill in April and an underpayment penalty on top, because nothing was taken out along the way.

When Your K-1 Is Due

A calendar-year partnership or S corporation must file its return, Form 1065 or Form 1120-S, by the 15th day of the third month after the tax year ends, which is March 15, and it must furnish each K-1 to owners by that same date. When the 15th falls on a weekend, the deadline shifts to the next business day; the 2025 returns were due March 16, 2026, because March 15 landed on a Sunday (IRS, Publication 509). The business can file Form 7004 for a six-month extension to September 15, which pushes your K-1 later too.

That timing is why K-1s arrive late in the filing season. Your K-1 waits on the business closing its own books first, so your personal return waits on a document you do not control. Current bookkeeping through the year is what moves the K-1 up.

Common Misconceptions About Schedule K-1

"I only pay tax on what the business paid me." You pay tax on your share of the profit, distributed or not. A partnership can reinvest every dollar and still hand you a K-1 showing taxable income. The tax follows the profit on Box 1, not the cash that reached your account.

"A K-1 and a 1099 are the same thing." They report different things. A 1099 reports a payment made to you. A K-1 reports your ownership share of an entity's full-year results, which is why it includes deductions and credits, not just an income figure.

"The K-1 is the business's problem, not mine." The deductions the business tracks are what shrink the income on your K-1. Miss expenses during the year and your Box 1 is overstated, so you pay tax on profit that was not really there. The records are yours to care about even when someone else prepares it.

Frequently Asked Questions

Is a Schedule K-1 the same as a 1099? No. A 1099 reports a payment, such as what a client paid an independent contractor. A K-1 reports your share of a partnership, S corporation, or trust's income, deductions, and credits for the whole year. You might receive both in one year: a K-1 as an owner, a 1099 as a contractor.

Do I attach my K-1 to my tax return? Generally no. The entity files a copy with the IRS; you keep yours and report the amounts on your 1040. The main exception for S corporation shareholders is backup withholding, which does get attached (IRS, Shareholder's Instructions).

What if I got no cash but my K-1 shows income? That is normal for a pass-through. You owe tax on your share of the profit whether or not the business distributed it. This is why partners and shareholders watch for distributions large enough to cover the tax on the income they are reporting.

Does K-1 income get hit with self-employment tax? A general partner's ordinary business income does, through Schedule SE. A limited partner's share generally does not, and S corporation income is not self-employment income at all. The S corporation owner pays employment tax on their salary instead.

When should my K-1 arrive? By March 15 for a calendar-year partnership or S corporation, or by the extended September 15 deadline if the business filed Form 7004. Weekend dates shift to the next business day.

Key Takeaways

• A Schedule K-1 reports your share of a pass-through entity's income, deductions, and credits so it can be taxed on your personal return instead of the entity's.
• Three forms share the name: K-1 (Form 1065) for partnerships, K-1 (Form 1120-S) for S corporations, and K-1 (Form 1041) for estates and trusts.
• Box 1 carries ordinary business income, and every deductible expense the business recorded during the year lowers it.
• Partnership income can trigger self-employment tax through Box 14; S corporation income does not, which is a core reason the entity choice matters.
• No one withholds on K-1 income, so plan for quarterly estimated taxes and watch Box 20 for the QBI deduction.

Whatever entity issues your K-1, the income on it starts as the business's receipts minus its expenses, so clean records are what keep Box 1 honest. Capture and categorize every business expense as it happens with a business expense tracker, track what comes in with an income tracker, and the numbers behind the K-1 are ready at filing time instead of reconstructed in March. Get Started with SparkReceipt to keep the records behind your K-1 in one place.