Answer: A Schedule K-1 reports your share of a partnership's, S corporation's, or trust's income, deductions, and credits for the year. Read it in two passes. First, Parts I and II: who issued it, which year it covers, and who it's made out to. Then Part III, where each numbered box holds one kind of income or deduction that goes to a specific place on your return. Ordinary business income (box 1 on a partnership or S corporation K-1) usually goes to Schedule E, interest and dividends go on Form 1040, and capital gains go to Schedule D. On partnership and S corporation K-1s, the cash you actually received is reported in its own box, and it isn't the same as your taxable income.
Context: This guide covers the three K-1s a household is likely to hold: from a partnership or LLC (Form 1065), an S corporation (Form 1120-S), and a trust or estate (Form 1041). It's written for the person who collects the K-1s and hands them to the CPA, not for the person preparing the return.
Updated for the 2026 tax year (filed in 2027). Last reviewed: September 30, 2026.
- You can owe tax on K-1 income you never received in cash. The IRS partner instructions say you may be liable for tax on your share "whether or not distributed."
- Distributions (box 19 on a partnership K-1) aren't income. They generally reduce your basis, and cash beyond your basis can create a gain.
- Check the name, taxpayer ID, tax year, and the Final K-1 and Amended K-1 boxes before reading any numbers. Plenty of K-1 problems start there.
- A lot of the information lives in codes and attached statements, not in the boxes themselves.
- Box 21 (foreign taxes paid) isn't enough for a foreign tax credit. The IRS points partners to Schedule K-3 instead.
| Partnership or LLC | S corporation | Trust or estate |
|---|
| Form it comes with | Form 1065 | Form 1120-S | Form 1041 |
| You're called | Partner | Shareholder | Beneficiary |
| Boxes in Part III | 1 to 23 | 1 to 19 | 1 to 14 |
| Business and rental income usually goes to | Schedule E, Part II | Schedule E, Part II | Schedule E, Part III |
| Cash you received | Box 19 | Box 16, code D | Not a separate box |
The three forms use different box numbers for the same kind of item. Interest income is box 5 on a partnership K-1, box 4 on an S corporation K-1, and box 1 on a trust K-1. When someone says "box 1," confirm which form they mean.
Parts I and II are the least interesting pages of the K-1 and the ones that cause the most trouble. On a partnership K-1:
- Tax year, at the top. Make sure it's 2026. A fiscal-year fund will show its own beginning and ending dates.
- Final K-1 and Amended K-1 checkboxes. Final means the interest ended, often because you sold it or the fund wound down. Amended means it replaces a K-1 you already received, so the older one should come out of the pile. (S corporations and partnerships that elected out of the centralized audit regime issue amended K-1s; other partnerships generally correct through an administrative adjustment request and Form 8986.)
- Item A, the partnership's EIN, and item B, its name. Compare them with last year's K-1. A sponsor may run several funds with similar names.
- Item D, publicly traded partnership. PTP income follows its own rules on your return.
- Items E and F, the partner's name and taxpayer ID. This tells you who the partner is. It may be you, your spouse, your revocable trust, an irrevocable trust, or an LLC taxed as a partnership or corporation. The IRS allows the K-1 to show only the last four digits of the ID, though the partnership reported the full number to the IRS.
- Item H2, disregarded entity. If a single-member LLC that's disregarded for tax holds the interest, H2 names the LLC and items E and F show its owner.
- Item G, general or limited partner. This affects self-employment tax and how the passive activity rules apply.
- Item J, your share of profit, loss, and capital, at the beginning and end of the year. A change usually means you bought in, sold down, or the fund admitted or redeemed other partners.
- Item K1, your share of liabilities. This is part of your basis even though it isn't cash you contributed.
- Item L, your capital account, reported on the tax basis method. The IRS partner instructions point out it often won't equal your basis, mainly because basis includes your share of partnership liabilities and the capital account doesn't.
An S corporation K-1 is simpler here. It shows your allocation percentage (item G), your shares at the beginning and end of the year (item H), and any loans you've made to the corporation (item I). A trust K-1 shows the trust's EIN, the fiduciary, and whether it's the trust's final return.
If the name or taxpayer ID is wrong, the partner instructions are clear: ask the issuer for a corrected K-1, and don't change the numbers on your copy.
Usually a handful of boxes carry the numbers. This table lines up the partnership and S corporation versions and shows where each amount usually goes for an individual filing Form 1040.
| What it is | Partnership box | S corp box | Where it usually goes |
|---|
| Ordinary business income or loss | 1 | 1 | Schedule E, line 28 (passive or nonpassive column) |
| Net rental real estate income or loss | 2 | 2 | Schedule E, line 28; losses run through Form 8582 |
| Guaranteed payments | 4a to 4c | none | Schedule E, line 28, nonpassive |
| Interest | 5 | 4 | Form 1040, line 2b |
| Ordinary dividends | 6a | 5a | Form 1040, line 3b |
| Qualified dividends | 6b | 5b | Form 1040, line 3a |
| Royalties | 7 | 6 | Schedule E, line 4 |
| Net short-term capital gain | 8 | 7 | Schedule D, line 5 |
| Net long-term capital gain | 9a | 8a | Schedule D, line 12 |
| Net section 1231 gain | 10 | 9 | Form 4797 |
| Section 179 deduction | 12 | 11 | Form 4562 |
| Self-employment earnings | 14 | none | Schedule SE |
| Schedule K-3 is attached | 16 | 14 | Checkbox; see below |
| AMT items | 17 | 15 | Form 6251 |
| Distributions | 19 | 16, code D | Generally not income; reduces basis; any excess over basis can be gain |
| Section 199A (QBI) information | 20, code Z | 17, code V | Form 8995 or 8995-A |
| Foreign taxes paid or accrued | 21 | 16, code F | Use Schedule K-3 for Form 1116 |
A trust K-1 is shorter: interest in box 1, dividends in boxes 2a and 2b, capital gains in boxes 3 and 4a, and business and rental income in boxes 6 to 8, which go to Schedule E, Part III. Box 11 shows deductions passed out in a trust's final year.
A few boxes need more than a glance:
- Box 1 depends on you, not the partnership. Whether it's passive depends on whether you materially participated in the business. The K-1 can't know that. Your CPA asks.
- Box 13 (other deductions) and box 20 (other information) are code lists. The letter matters as much as the number. Charitable contributions, investment interest, and the 199A figures for the qualified business income deduction all arrive this way.
- "See attached statement." Many K-1s put the real detail in pages behind the form, including state information and the activity-by-activity breakdown boxes 22 and 23 refer to. Keep every page together.
This is the part that surprises people. A K-1 reports your share of what the entity earned, whether or not it paid anything out. A real estate fund can show income on box 2 in a year it distributed nothing. A startup LLC can distribute cash in a year it reported a loss.
Distributions show up separately: box 19 on a partnership K-1, box 16 code D on an S corporation K-1. They aren't taxed as income when you receive them; they generally reduce your basis. When cash distributed exceeds your basis in a partnership, the excess is treated as gain, which the IRS instructions describe under box 19.
For S corporations, tracking basis is the shareholder's job. The IRS says to generally use Form 7203, and Schedule E requires the basis computation when you report a loss, receive a distribution, sell stock, or get a loan repaid by the corporation. If nobody has kept that basis history, expect your CPA to ask for the records to rebuild it.
The form tells you your share of one entity. It doesn't tell you whether you have all of them, or which return each belongs on.
- Owner first. A K-1 made out to a non-grantor trust is reported on the trust's return, which may issue its own K-1 to you later in the season. Some irrevocable trusts are grantor trusts, whose items are reported by the grantor. Your CPA determines which applies. A K-1 to a disregarded LLC lands on the owner's return. Sort by owner before you sort by issuer.
- Compare with last year. Item J's percentages, item L's ending capital, and the set of boxes that are filled in should look like last year's unless something changed. A new box or a big swing is worth a note to your CPA.
- Watch for the ones that didn't come. Last year's Schedule E, Part II lists every partnership and S corporation on your return. Anything on that list without a 2026 K-1 is late, final, sold, or sent under another owner's name.
Bring these to your CPA rather than guessing:
- Any K-1 with the Amended box checked, or a second K-1 from the same issuer.
- A Final K-1, or a K-1 showing a sale of your interest.
- A loss in box 1 or box 2, which brings in basis, at-risk, and passive loss limits.
- Distributions larger than you expected, or larger than your contributions over the years.
- Anything in box 21, or a K-3 attached, if you claim a foreign tax credit.
- A K-1 made out to a trust or entity when you expected it to be made out to you, or the reverse.
- Items you're treating differently from how the K-1 reports them. The IRS requires Form 8082 to disclose that.
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What is a Schedule K-1?
A Schedule K-1 reports your share of the income, deductions, and credits of a partnership, S corporation, trust, or estate. The entity files a copy with the IRS and sends one to you. You use it to prepare your own return; you generally don't attach it.
Which box on a K-1 is taxable income?
Several boxes can be taxable. Box 1 (ordinary business income), box 2 (rental real estate), interest, dividends, and capital gains are the most common. Distributions are reported separately and generally aren't income unless they exceed your basis.
Why do I owe tax on K-1 income I didn't receive?
Partnerships and S corporations generally don't pay income tax themselves, so their income passes through to the owners. You may be liable for tax on your share whether or not the entity distributed any cash.
Where does K-1 income go on Form 1040?
It depends on the box. Ordinary business and rental income from partnerships and S corporations usually go on Schedule E, Part II. Interest and dividends go on Form 1040, lines 2b and 3b. Capital gains go on Schedule D. Trust and estate business and rental income goes on Schedule E, Part III.
Is the capital account on my K-1 the same as my basis?
Often not. The IRS partner instructions explain that your adjusted basis includes your share of partnership liabilities, while the tax basis capital account in item L doesn't.
What should I do if my K-1 has an error?
Ask the issuer for a corrected K-1. The IRS partner instructions say not to change the items on your copy.
- IRS: Schedule K-1 (Form 1065) (2025) and draft 2026
- IRS: Partner's Instructions for Schedule K-1 (Form 1065) (2025), purpose, Errors, Inconsistent Treatment of Items, items J, K, and L, and boxes 1 to 21
- IRS: Schedule K-1 (Form 1120-S) (2025) and draft 2026
- IRS: Shareholder's Instructions for Schedule K-1 (Form 1120-S) (2025), stock basis, Form 7203, box 16 code D, box 17 code V
- IRS: Schedule K-1 (Form 1041) (2025), including its page 2 reporting guide, and draft 2026
- IRS: Instructions for Form 1041 (2025), grantor type trusts
- IRS: Schedule E (Form 1040) (2025), Part II columns and the S corporation basis computation note
X1 Wealth provides planning and coordination tools. It does not prepare or file tax returns. This content is for informational purposes only and does not constitute legal, tax, or investment advice. Consult a qualified professional for advice specific to your situation.
