Tax

K-1 Income: What It Is and How to File It

If you're a partner, S-corp shareholder, or LLC member, you'll get a K-1. Here's how to read it and where each number lands on your 1040.

By Aparna Devalla, CPA3 min · 5 slidesUpdated July 26, 2026

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What a K-1 Actually Is

A Schedule K-1 reports your share of income, deductions, credits, and other items from a passthrough entity.
Three flavors: 1065 K-1 (partnerships and multi-member LLCs), 1120-S K-1 (S-corps), and 1041 K-1 (estates and trusts).
Passthrough means: the entity doesn't pay federal income tax, it allocates the income to you, and you report it on your personal return.
You owe tax on the K-1 income whether or not the entity actually distributed cash to you. This is the #1 surprise for new partners.

Reading the K-1 (Form 1065: Partnership)

Box 1: Ordinary business income/loss → Schedule E, Part II (subject to self-employment tax for general partners).
Box 2: Net rental real estate income → also Schedule E (passive unless you materially participate).
Boxes 5–7: Interest, dividends, and royalties → Schedule B / Schedule E.
Boxes 8–11: Capital gains and other portfolio income → Schedule D.
Box 13: Section 179, charitable contributions, and various deductions → Schedule A or as an adjustment.
Box 14: Self-employment earnings → Schedule SE for SE tax (15.3% on first $184,500 in 2026).
Box 20: Other information including QBI deduction (Code Z) and foreign tax credits.

S-corp K-1 (Form 1120-S): Key Differences

S-corp K-1 income in Box 1 is NOT subject to self-employment tax; that's the entire point of the S-corp election.
But your salary as an S-corp owner-employee IS on a W-2 (with payroll tax) and is separate from K-1 income.
Box 16 codes report distributions, which generally don't trigger additional tax if you have basis (but exceeding basis = capital gain).
Track your basis carefully: distributions in excess of basis are taxable, and losses you can deduct are limited to basis.

Cash vs. Tax: The Phantom Income Problem

You can owe tax on $200K of allocated K-1 income while the entity distributed only $50K to you. This is 'phantom income.'
Mitigation: ensure the partnership/operating agreement requires tax distributions sufficient to cover the highest-bracket partner's tax on allocated income.
If the entity makes guaranteed payments to you, those are reported on Box 4, taxable to you AND deductible to the entity.
Always set aside cash for the K-1 tax liability before spending the distributions.

Filing Tips and Common Pitfalls

K-1s often arrive AFTER the April deadline. Most partnerships file Form 7004 for an automatic 6-month extension. Plan to extend your personal return.
Multi-state K-1s require nonresident state returns in every state where the entity does business; a Bay Area LLC operating in five states means five state returns.
Don't ignore the K-1 footnotes; they often contain the QBI calculation, foreign source income, and other audit-flagging items.
Need help? Rubric Financial handles K-1-heavy personal returns including multi-state and basis tracking.

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Educational content, not tax, legal, or accounting advice. Confirm with a CPA before acting.

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