Where Does K-1 Income Go on Form 1040?

K-1 income does not land on a single line of Form 1040. Each item on a Schedule K-1 travels through a supporting schedule or form first, and where it ends up on your 1040 depends on what kind of income, deduction, or credit the item represents and whether the K-1 came from a partnership (Form 1065), an S corporation (Form 1120-S), or an estate or trust (Form 1041). The box numbers differ across those three, but the destinations on your 1040 are consistent. Below is the routing, item by item.

Ordinary Business Income and Rental Income

The most common K-1 item is ordinary business income or loss, reported in Box 1 on both partnership and S corporation K-1s. It flows to Part II of Schedule E (Supplemental Income and Loss), where each K-1 you receive gets its own line entry.¹

Whether the amount goes in the passive or non-passive column depends on your involvement. If you materially participated, the income or loss is non-passive and fully deductible against other income. The most straightforward material-participation test is more than 500 hours of work in the activity during the year.² If you didn’t materially participate, the income is passive and any loss can only offset other passive income; unused passive losses are suspended and carried forward.

Net rental real estate income or loss also flows to Schedule E. Rental activity is passive by default regardless of hours.³ Two exceptions matter. If you actively participated in a rental real estate activity, you can deduct up to $25,000 of rental losses against non-passive income; that allowance phases out between $100,000 and $150,000 of modified AGI.² If you qualify as a real estate professional (more than half your working hours and at least 750 hours in real property businesses in which you materially participate), your rental activities lose the automatic passive label.

The final total from Schedule E line 41 goes to Schedule 1 (Form 1040), line 5,⁴ and Schedule 1 flows to Form 1040, line 8.⁵

Interest and Dividends

Interest income appears in Box 5 on a partnership K-1 and Box 4 on an S corporation K-1. Both go to Form 1040, line 2b.⁶⁷ Ordinary dividends are in Box 6a for partnerships and Box 5a for S corporations, and both flow to Form 1040, line 3b. Qualified dividends are reported separately and flow to Form 1040, line 3a.

If your total interest or ordinary dividends from all sources exceed $1,500 for the year, you must file Schedule B to list each payer.⁸ Below that threshold, the amounts go straight onto Form 1040.

Capital Gains, Section 1231, and Royalties

Short-term capital gains and losses are in Box 8 (partnership) or Box 7 (S corp). Long-term gains and losses are in Box 9a (partnership) or Box 8a (S corp). Both categories are reported on Schedule D.⁶⁷

Section 1231 gains and losses (sales of property used in a trade or business) appear in Box 10 (partnership) or Box 9 (S corp). These do not go directly to Schedule D. They first pass through Form 4797, Part I. If the result is a net gain and you have no unrecaptured Section 1231 losses from the prior five years, the gain then transfers to Schedule D as a long-term capital gain.⁹

The final Schedule D total flows to Form 1040, line 7. A net capital loss is deductible against other income up to $3,000 per year ($1,500 if married filing separately), with the remainder carried forward.¹⁰

Royalty income (Box 7 on a partnership K-1) routes by context. Royalties tied to the entity’s trade or business generally go on Schedule E; investment royalties follow the portfolio income path.

Self-Employment Income

Certain K-1 items trigger self-employment tax. This obligation applies to partners in a partnership but generally not to S corporation shareholders, whose Box 1 ordinary business income is not subject to SE tax (S corp shareholders who work in the business are paid W-2 wages instead).

Guaranteed payments for services (Box 4a on a partnership K-1) are compensation paid to a partner regardless of profit and are self-employment income. They also appear on Schedule E, Part II, in the non-passive column. Box 4b covers guaranteed payments for the use of capital.⁶

Net earnings from self-employment appear in Box 14, Code A on a partnership K-1 and represent the partner’s share of ordinary business income subject to SE tax. This amount goes to Schedule SE.

The combined SE tax rate is 15.3% (12.4% Social Security and 2.9% Medicare).¹¹ The Social Security portion applies only to earnings up to $184,500 in 2026.¹² Medicare has no cap, and an additional 0.9% Medicare tax applies above $200,000 for single filers ($250,000 for joint filers).

Schedule SE flows to Schedule 2, line 4, which flows to Form 1040, line 23.¹³ You can deduct half of your SE tax as an adjustment to income on Schedule 1.

QBI, Section 179, and Charitable Contributions

The qualified business income deduction lets eligible taxpayers deduct up to 20% of qualified business income from a pass-through. On a partnership K-1, the QBI information is in Box 20, Code Z; on an S corporation K-1, it’s Box 17, Code V. The calculation is done on Form 8995 (simplified) or Form 8995-A (detailed), depending on your taxable income.¹⁴¹⁵ The deduction lands on Form 1040, line 13. It reduces taxable income but not AGI.

Section 179 expense passes through in Box 12 (partnership) or Box 11 (S corp).⁶¹⁶ You combine it with any Section 179 from your own activities on Form 4562, subject to the taxpayer-level limit ($2,560,000 for 2026). The deductible amount ultimately flows to Schedule E.

Charitable contributions do not go on Schedule E. On a partnership K-1 they appear in Box 13, Codes A through G, each with a different AGI limitation depending on the type of contribution. On an S corporation K-1 they appear in Box 12. All of these amounts are reported on Schedule A as itemized deductions, so they only benefit you if you itemize.⁶

Foreign Tax and Other Credits

Foreign taxes paid by the entity appear in Box 16 (partnership) or Box 14 (S corp). To claim a credit, you generally file Form 1116.¹⁷ The credit is a dollar-for-dollar reduction of tax, subject to limits based on foreign-source income. It flows through Schedule 3, line 1, and then to Form 1040, line 20.¹⁸

Other credits, such as the low-income housing credit or general business credit, are in Box 15 (partnership) or Box 13 (S corp). Each credit type has its own IRS form for calculating the allowable amount. The final nonrefundable credit totals are aggregated on Schedule 3 and land on Form 1040, line 20.

If Your K-1 Came From an Estate or Trust

Form 1041 K-1s use different box numbers, but the 1040 destinations are the same. Interest is in Box 1, ordinary dividends in Box 2a, qualified dividends in Box 2b, short-term capital gains in Box 3, and long-term capital gains in Boxes 4a through 4c.¹⁹ Ordinary business income, rental real estate income, and other rental income are in Boxes 6 through 8.²⁰ Interest still goes to 1040 line 2b, dividends to line 3b, capital gains through Schedule D, and business and rental income through Schedule E.

Before a K-1 Loss Reduces Your Tax

A loss shown on your K-1 does not automatically reduce your tax bill. It has to clear three gates in order: basis, at-risk, and passive activity.

For partners, basis includes your capital contributions, your share of partnership profits, and your share of partnership liabilities, including debt you didn’t personally guarantee. For S corporation shareholders, stock basis includes only capital contributions and accumulated profits, plus loans you personally made directly to the corporation; corporate-level debt does not increase your basis. S corporation shareholders who need to claim a loss, received a non-dividend distribution, or disposed of stock must report their basis calculation on Form 7203.²¹

Losses that survive the basis limit then face the at-risk rules on Form 6198: you can only deduct up to the amount you personally stand to lose, and any excess carries forward.²² The final gate is passive activity. If you didn’t materially participate, remaining losses can only offset passive income; the excess is suspended on Form 8582 and carried forward until you produce passive income or dispose of the activity entirely.²³

Nothing Was Withheld: Estimated Payments

Pass-through entities do not withhold income tax for you. Partners are personally responsible for paying tax on K-1 income, including SE tax, and typically need to make quarterly estimated payments using Form 1040-ES.²⁴ The same applies to S corporation shareholders on their share of pass-through income beyond W-2 wages. If you owe $1,000 or more at filing and haven’t paid enough in, you’ll face an underpayment penalty. The safe harbors are paying at least 90% of the current year’s tax or 100% of the prior year’s tax (110% if your prior-year AGI exceeded $150,000).

Late, Missing, or Corrected K-1s

Partnerships and S corporations often don’t finalize their returns until near the March 15 deadline, so a K-1 can arrive only weeks before April 15. File Form 4868 by April 15 for an automatic six-month extension to October 15.²⁵ The extension gives you more time to file, not more time to pay; you still need to estimate and pay by April 15 to avoid interest.

If a corrected or amended K-1 arrives after you’ve filed, use Form 1040-X to amend. Include the corrected K-1 and redo any affected supporting schedules (Schedule E, D, SE). Adjustments to income can ripple into deductions and credits with AGI-based limits.²⁶

If you believe the entity reported an item incorrectly and won’t issue a correction, file Form 8082 to notify the IRS you’re treating the item differently than how it was reported. Form 8082 is also required if the entity hasn’t given you a K-1 by the time your return is due, including extensions, and you have items that need to be reported.²⁷

1
Internal Revenue Service. 2025 Instructions for Schedule E (Form 1040) – Supplemental Income and Loss
2
Internal Revenue Service. Publication 925 (2025), Passive Activity and At-Risk Rules
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Office of the Law Revision Counsel. 26 USC 469 – Passive Activity Losses and Credits Limited
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IRS. 2025 Schedule E (Form 1040) – Supplemental Income and Loss
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IRS. 2025 Schedule 1 (Form 1040)
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Internal Revenue Service. Partner’s Instructions for Schedule K-1 (Form 1065) (2025)
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Internal Revenue Service. Shareholder’s Instructions for Schedule K-1 (Form 1120-S) (2025)
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Internal Revenue Service. About Schedule B (Form 1040), Interest and Ordinary Dividends
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Internal Revenue Service. Instructions for Form 4797 (2025)
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IRS. 2025 Schedule D (Form 1040)
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Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
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Social Security Administration. Contribution and Benefit Base
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IRS. 2025 Schedule 2 (Form 1040)
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Internal Revenue Service. Instructions for Form 8995 (2025)
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Internal Revenue Service. Instructions for Form 8995-A (2025)
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Internal Revenue Service. 2025 Instructions for Form 1120-S
17
Internal Revenue Service. Instructions for Form 1116 (2025)
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IRS. 2025 Schedule 3 (Form 1040)
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IRS. 2025 Schedule K-1 (Form 1041)
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Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1 (2025)
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Internal Revenue Service. Instructions for Form 7203
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Internal Revenue Service. Instructions for Form 6198
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Internal Revenue Service. Instructions for Form 8582 (2025)
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Internal Revenue Service. Businesses 1 – Estimated Tax FAQ
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IRS. Application for Automatic Extension of Time To File U.S. Individual Income Tax Return
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Internal Revenue Service. Instructions for Form 1040-X
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IRS. Instructions for Form 8082