A K-1 form reports your share of income or loss from a partnership, S corporation, or trust

A K-1 form (officially Schedule K-1) is a document that tells you how much profit or loss you owe taxes on from a business you don't fully own. Instead of the business paying taxes as a single unit, the owners each report their own slice of the income on their personal tax return. The K-1 breaks down exactly what that slice is.

You receive a K-1 when you own part of a partnership, an S corporation, an LLC taxed as a partnership, or a trust that distributes income to you. The business itself doesn't pay federal income tax—you do, based on the K-1 numbers. This is different from a regular corporation (C corporation), where the company pays tax first and then you pay tax again on dividends you receive.

The K-1 arrives by January 31 each year and covers the previous calendar year. You use it to fill out your own tax return, typically Schedule E (for partnerships and S corporations) or Schedule 1 (for trust income), depending on the type of entity.

Key Takeaways

  • A K-1 shows your personal share of business income, loss, deductions, and credits from a partnership, S corporation, or trust.
  • You must report K-1 income on your tax return even if you didn't receive cash—the business may have retained earnings that are still taxable to you.
  • The K-1 arrives by January 31, and you need it to complete your federal tax return accurately.
  • If you receive a K-1 from multiple sources, you report each one separately on your return.
  • Mismatches between what the business reports to the IRS and what you report can trigger an audit, so verify the numbers match.

What information appears on a K-1

The K-1 has two pages. The top section identifies the business (name, address, EIN), your name and Social Security number, and your ownership percentage. It also shows what type of entity it is—partnership, S corporation, or trust.

The main body lists your share of income and deductions in separate boxes. Box 1a shows ordinary business income (or loss). Other boxes break out capital gains, dividends, interest, rental real estate income, and various deductions like depreciation and charitable contributions. Some boxes are marked "not separately stated," meaning they're already rolled into the ordinary income figure.

The K-1 also reports any distributions you received during the year (cash or property the business paid out to you) and your basis in the business (roughly, how much you've invested minus what you've taken out). Your basis matters because it limits how much loss you can deduct in any single year.

Why you pay tax on K-1 income even if you didn't receive cash

This surprises many people: you owe taxes on K-1 income whether or not the business actually paid you money. If the partnership or S corporation earned $50,000 and your share is $10,000, you report that $10,000 as taxable income—even if the business kept all the money and paid you nothing.

The logic is that the business's profit belongs to you as an owner, whether it stays in the business or comes to you as a check. The business is not a separate taxpayer; it's a pass-through entity. The income "passes through" to you for tax purposes. If you want cash, you ask for a distribution. If you don't ask, the profit stays in the business, but you still owe tax on your share.

This is why partnerships and S corporations sometimes distribute cash specifically to cover the owners' tax bills. Without that distribution, an owner could owe thousands in taxes on income they never received.

How to report K-1 income on your tax return

For a partnership or S corporation K-1, you report the income on Schedule E (Supplemental Income and Loss). You enter your share of income, loss, and deductions in the appropriate lines. If you own multiple partnerships or S corporations, you file a separate Schedule E for each one, then combine the totals on your main return (Form 1040).

For trust K-1 income, you report it on Schedule 1 (Additional Income) if you're the beneficiary, or you may file a separate return if the trust itself is the taxpayer. The instructions on the K-1 itself will tell you which schedule to use.

The K-1 also provides a reference number (usually in the upper right) that matches the business's own tax return. The IRS cross-checks these numbers, so if your K-1 doesn't match what the business reported, the IRS will notice and may contact you.

What to do if you don't receive a K-1 by February

If the business is late sending K-1s, you have a few options. First, contact the business directly and ask for the form. Many delays are straightforward oversights, and a phone call often speeds things up.

If the business won't provide the K-1, you can file your return using the best information you have and attach a statement explaining that you're waiting for the form. The IRS calls this a "protective claim." You can then file an amended return once the K-1 arrives.

If you believe the business is deliberately withholding the K-1 or providing false information, you can report it to the IRS using Form 8275 (Disclosure Statement) or by contacting the IRS directly. However, this is rare and usually a last resort.

K-1 losses and how they limit your deductions

If the business had a loss, your K-1 will show a negative number. You can deduct that loss on your return, but only up to your basis in the business. Basis is roughly the amount of money and property you've put in, minus distributions you've taken out.

If your loss exceeds your basis, you can't deduct the excess in that year. Instead, you carry it forward to future years when your basis increases (usually through additional contributions or retained earnings). This rule prevents you from deducting more than you've actually invested.

There's also a separate rule called the passive activity loss limitation. If you don't materially participate in running the business, your losses may be limited to passive income you earned that year. Material participation generally means you were involved in the business's operations for more than 500 hours per year or in a similar substantial way.

Reconciling your K-1 with the business's tax return

Before you file, compare your K-1 to the business's own tax return if you can access it. The business files either a Form 1065 (partnership), Form 1120-S (S corporation), or Form 1041 (trust). Your K-1 should be consistent with the totals on that return.

If you spot a discrepancy—for example, the K-1 shows $5,000 in income but the business's return shows $3,000—contact the business and ask for a corrected K-1. The IRS will catch mismatches during processing, and you don't want to file a return that conflicts with what the business reported.

If the business issues a corrected K-1, it will be marked "Amended" at the top. Use the corrected version, not the original. If you've already filed your return, you'll need to file an amended return (Form 1040-X) once you receive the corrected K-1.

Frequently Asked Questions

Do I have to report K-1 income if I didn't receive any money from the business?

Yes. K-1 income is taxable whether or not you received a distribution. The business's profit belongs to you as an owner for tax purposes, even if it stayed in the business. You report your share on your return and owe tax on it.

What happens if the K-1 I received doesn't match what the business reported to the IRS?

The IRS will likely notice the mismatch and may contact you to explain the difference. If the error is the business's fault, ask for a corrected K-1 and file an amended return. If you filed based on incorrect information the business provided, you may be able to claim relief from penalties, but it's better to catch and fix it before the IRS does.

Can I deduct a K-1 loss if it's larger than my investment in the business?

No. You can only deduct losses up to your basis (your investment minus distributions). Excess losses carry forward to future years. If the business is a passive activity and you don't materially participate in running it, additional limits may explore to how much loss you can deduct each year.

What if I lose my K-1 or the business won't send me one?

Contact the business first and request a duplicate. If they won't provide it, you can file your return with the information you have and attach a statement explaining the delay. Once you receive the K-1, file an amended return. If the business is uncooperative, you can report it to the IRS.

Do I need a K-1 if I own an LLC?

Only if your LLC is taxed as a partnership or S corporation. Many single-member LLCs are taxed as sole proprietorships and don't issue K-1s. Multi-member LLCs are usually taxed as partnerships and do issue K-1s. Check with your business's tax preparer to confirm how your LLC is classified.