Schedule K-1 (Form 1065): The Complete Resource Guide for Partners & Tax Professionals

Who Must File Form 1065 and Issue K-1s?

Any domestic partnership — including general partnerships, limited partnerships (LPs), limited liability partnerships (LLPs), and most multi-member LLCs taxed as partnerships — must file Form 1065 annually. As part of that filing, the partnership is required to prepare and distribute a Schedule K-1 to each partner, as well as submit copies to the IRS.

Entities that issue Schedule K-1 (Form 1065) include:

• General partnerships — Traditional business arrangements where all partners share management responsibilities and liability.
• Limited partnerships (LPs) — Structures with at least one general partner and one or more limited partners.
• Limited liability partnerships (LLPs) — Common among law firms, accounting firms, and medical practices.
• Multi-member LLCs (taxed as partnerships) — LLCs with two or more members that have not elected to be taxed as a corporation.

Single-member LLCs, S corporations, and trusts/estates use different K-1 variants — Schedule K-1 for Form 1120-S and Form 1041, respectively.

Why Schedule K-1 Matters for Partners

The K-1 is more than just an informational form — it directly affects each partner's personal tax return. Here's why it matters:

• Pass-through taxation: The partnership itself does not pay federal income tax. Instead, profits and losses "pass through" to partners, who report them on their individual returns (Form 1040), business returns, or corporate returns, depending on the partner's entity type.
• Self-employment tax: For general partners, guaranteed payments and certain ordinary income items from the K-1 may be subject to self-employment tax.
• Passive activity rules: Limited partners and certain LLC members must apply passive activity loss rules to income and losses reported on their K-1.

Key Sections of Schedule K-1 (Form 1065) Explained

Understanding each part of the K-1 helps partners accurately transfer the information to their personal or entity returns. You can download the official Schedule K-1 (Form 1065) PDF directly from the IRS website.

Part I — Information About the Partnership

This section identifies the partnership by its Employer Identification Number (EIN), name, address, and whether it is a publicly traded partnership (PTP). It also notes whether the partnership is subject to the centralized partnership audit regime under the Bipartisan Budget Act of 2015.

Part II — Information About the Partner

Part II identifies the partner receiving the K-1, including their taxpayer identification number (TIN), address, and entity type (individual, corporation, estate, trust, etc.). It also specifies whether the partner is a general or limited partner, the partner's profit/loss/capital sharing percentages at the beginning and end of the year, and the partner's capital account analysis.

The capital account analysis shows:

• Beginning capital account balance
• Capital contributed during the year
• Net income or loss allocated to the partner
• Distributions received
• Ending capital account balance

Partners should note whether the capital account is reported on a tax basis, GAAP basis, section 704(b) book basis, or another method, as this impacts how the information integrates with other tax calculations.

Part III — Partner's Share of Current Year Income, Deductions, Credits, and Other Items

This is the most detailed section of the K-1 and contains the information that flows directly onto the partner's tax return. The IRS provides comprehensive Instructions for Schedule K-1 (Form 1065) for a line-by-line reference.

Income and Loss (Lines 1–11):

• Line 1 — Ordinary business income (loss): The partner's share of the partnership's net income or loss from its primary trade or business activities. This flows to Schedule E of Form 1040 for most partners and may be subject to self-employment tax for general partners.
• Line 2 — Net rental real estate income (loss): Income or loss from rental real estate activities held by the partnership. Subject to passive activity rules.
• Line 3 — Other net rental income (loss): Rental income from property other than real estate (e.g., equipment).
• Line 4 — Guaranteed payments: Payments made to a partner for services or use of capital, regardless of whether the partnership had income. These are treated as ordinary income and are typically subject to self-employment tax.
• Line 5 — Interest income: The partner's allocable share of interest income earned by the partnership.
• Line 6a — Ordinary dividends / 6b — Qualified dividends:Dividend income passed through from partnership investments. Qualified dividends may be taxed at lower capital gains rates.
• Line 7 — Royalties
• Line 8 — Net short-term capital gain (loss)
• Line 9a — Net long-term capital gain (loss): Long-term gains taxed at preferential capital gains rates.
• Line 9b — Collectibles (28%) gain (loss)
• Line 9c — Unrecaptured section 1250 gain
• Line 10 — Net section 1231 gain (loss): Gain or loss from the sale of business property held more than one year.
• Line 11 — Other income (loss): A catchall for items like cancellation of debt income, section 1256 contract gains/losses, and other miscellaneous items.

Deductions (Lines 12–13):

• Line 12 — Section 179 deduction: The partner's share of the partnership's election to immediately expense qualifying business property. See Form 4562 for more details on depreciation and amortization deductions.
• Line 13 — Other deductions: Includes cash contributions, noncash contributions, portfolio deductions, and other itemized deductions the partner may be able to claim.
• Line 14 — Self-Employment Earnings (Loss):
  Reports the partner’s share of net earnings subject to self-employment tax. General partners typically include ordinary business income and guaranteed payments. This amount is used to calculate self-employment tax on Schedule SE.

Credits (Line 15):

Partners receive their share of various tax credits the partnership has generated, such as the low-income housing credit, rehabilitation credit, renewable energy credits, and work opportunity tax credit, among others.

Line 16 — Schedule K-3 Attachment:

Indicates whether Schedule K-3 is attached to provide detailed international tax information. If checked, partners must review Schedule K-3 for foreign income, foreign taxes, and other international reporting items

Alternative Minimum Tax (AMT) Items (Line 17):

AMT adjustments and preferences pass through to partners and must be included in their AMT calculations.

Tax-Exempt Income and Non-deductible Expenses (Lines 18):

• Tax-exempt income, such as tax-exempt interest from municipal bonds.
• Non-deductible expenses that reduce the partner's basis but cannot be deducted.

Distributions (Line 19):

Cash and property distributions made to the partner during the tax year. Distributions are generally not taxable to the extent of the partner's basis but can trigger gain if they exceed basis.

Other Information (Lines 20 and beyond):

Line 20 contains an extensive list of additional items using codes (A through Z and beyond), including qualified business income (QBI) information for the Section 199A deduction, Section 751 hot asset items, foreign tax information, and more.

Schedule K vs. Schedule K-1: What's the Difference?

Partners often confuse these two related schedules. Schedule K is the summary schedule attached to Form 1065 that reports the partnership's total share of income, deductions, and credits across all partners combined. Schedule K-1, on the other hand, is the individual statement that breaks out each specific partner's allocated portion. Think of Schedule K as the whole pie, and each K-1 as an individual slice — they must reconcile to the same totals.

The Section 199A Deduction and K-1s

One of the most impactful items on a modern K-1 is the Qualified Business Income (QBI) deduction under Section 199A, introduced by the Tax Cuts and Jobs Act of 2017. This deduction allows eligible taxpayers to deduct up to 20% of their qualified business income from pass-through entities, subject to limitations.

Partnership K-1s report QBI-related information in Box 20, Code Z. Partners need this information — including the amount of QBI, W-2 wages paid by the partnership, and unadjusted basis immediately after acquisition (UBIA) of qualified property — to calculate their allowable deduction on Form 8995 or Form 8995-A.

The deduction may be limited for partners in Specified Service Trades or Businesses (SSTBs) above certain income thresholds.

Partner's Basis: Why It's Critical

Your adjusted basis in a partnership interest is one of the most important numbers you'll track as a partner, and the Schedule K-1 provides the inputs you need to maintain it.

Basis starts with your initial contribution (cash or property) and is adjusted each year for:

Increases to basis:

• Your share of partnership income and gain
• Additional capital contributions
• Your share of partnership liabilities

Decreases to basis

• Your share of partnership losses and deductions
• Distributions you receive
• Your share of partnership liabilities that decreased

Basis can never go below zero. If your share of losses exceeds your basis, those excess losses are suspended and carried forward until you have sufficient basis to absorb them. Tracking basis carefully each year — using the K-1 as your primary source document — protects you from over-deducting losses and ensures you correctly calculate gain or loss when you eventually sell or liquidate your interest.

For detailed guidance on partnership basis rules, refer to IRS Publication 541 (Partnerships).

At-Risk Rules and Passive Activity Rules

Two additional limitations apply to partnership losses reported on a K-1 before they can be deducted on a partner's return:

At-Risk Rules (Section 465): Partners can only deduct losses to the extent they are "at risk" — meaning the amount they could actually lose. Amounts at risk generally include cash contributed, the adjusted basis of property contributed, and certain recourse debt. Nonrecourse debt (except qualified nonrecourse financing secured by real property) typically does not increase a partner's at-risk amount. Partners use Form 6198 to calculate and report at-risk limitations.

Passive Activity Loss Rules (Section 469): Losses from passive activities can only offset income from other passive activities. A partner is generally passive in a partnership if they do not materially participate in the partnership's activities. Limited partners are presumed passive. Excess passive losses are suspended and carried forward to future years when passive income is available or the activity is fully disposed of. These limitations are calculated using Form 8582.

These rules interact with each other and with basis limitations, meaning a loss reported on a K-1 may face multiple layers of limitation before it can actually reduce taxable income.

When to Expect Your Schedule K-1

Unlike W-2s and 1099s, which are due to recipients by January 31, Schedule K-1 forms for partnerships are tied to the partnership's tax filing deadline.

Partnerships filing on time must issue K-1s by March 15 (or the next business day if March 15 falls on a weekend or holiday — for the 2025 tax year, the deadline is March 16, 2026).

Partnerships that fail to file on time face a penalty of $255 per partner, per month (up to 12 months). A separate penalty of $330 per K-1 applies for failure to furnish Schedule K-1s to partners on time.

If the partnership files for an extension using Form 7004, the due date extends to September 15, which can significantly delay your ability to file your own personal return.

Because of this timing issue, many partners who are waiting on K-1s file for a personal tax extension using Form 4868 to extend their own filing deadline to October 15. This is a very common and completely acceptable practice.

What to do if your K-1 is late:

• Contact the partnership's managing partner or tax preparer directly.
• If you believe you should receive a K-1 and cannot obtain it, consult a tax professional about your options.
• Do not simply omit partnership income from your return — all pass-through income is reportable regardless of whether you received the K-1.

Form 1065 vs. Form 1120-S: Which One Applies to You?

If your business is an S corporation, you file Form 1120-S instead of Form 1065, and shareholders receive a K-1 from Form 1120-S rather than Form 1065. The two forms serve the same general pass-through purpose but apply to different entity types. For a detailed comparison, see our Form 1120-S vs. Form 1065 comparison guide.

Common Mistakes to Avoid with Schedule K-1

1. Ignoring the footnotes and supplemental schedules. Many K-1s come with attached statements that provide additional detail beyond what fits in the boxes. Missing this detail can lead to errors.
2. Failing to apply basis, at-risk, and passive activity limitations. Simply entering the loss from Box 1 without checking whether you have sufficient basis, are at-risk, or qualify as an active participant can result in an incorrect deduction that may trigger an IRS notice.
3. Not tracking basis from year to year. Basis tracking is the partner's responsibility, not the partnership's. Failing to maintain an accurate basis schedule makes it impossible to correctly determine the taxability of future distributions or the gain or loss on a future sale.
4. Missing state K-1 requirements. Many states require separate state K-1s or adjustments. If the partnership operates in multiple states, partners may need to file nonresident state returns in those states. Do not assume the federal K-1 covers your state tax obligations.
5. Confusing distributions with income. A distribution shown on the K-1 is not necessarily taxable income. Whether it's taxable depends on your basis. Conversely, allocated income is taxable even if you never actually received a cash distribution.
6. Not reconciling with the prior year K-1. Changes in profit/loss percentages, capital account balances, and liability allocations from year to year should be reviewed and understood before filing.

Schedule K-1 and Real Estate Partnerships

Partnerships that own real estate generate K-1s with some unique characteristics. Rental real estate income or loss is reported in Box 2 of the K-1, and any income or loss from the IRS Form 8825 (Rental Real Estate Income and Expenses of a Partnership) flows through to this line. Real estate partnerships may also generate significant depreciation deductions — including bonus depreciation and cost segregation results — that are allocated to partners via the K-1. The interplay between at-risk rules, passive activity rules, and real estate professional status makes real estate K-1s particularly complex and warrants careful review.

Publicly Traded Partnerships (PTPs) and K-1s

Partners in Publicly Traded Partnerships (PTPs) — also called master limited partnerships (MLPs) — receive Schedule K-1s just like investors in private partnerships. However, PTP K-1s come with unique complexities:

• Passive loss rules apply at the PTP level, meaning losses from one PTP cannot offset income from another PTP or other passive income — they can only offset income from that same PTP.
• Section 751 "hot asset" issues are common with PTP dispositions and can convert what appears to be a capital gain into ordinary income.
• State filing requirements can be extensive, as PTPs often operate in many states.
• K-1s from PTPs may arrive late and sometimes require amended K-1s.

Investors in PTPs through brokerage accounts should consult a tax advisor familiar with MLP taxation, as the complexity is significantly higher than with a standard partnership interest.

Frequently Asked Questions (FAQs)

1. Do I pay taxes on my K-1 income even if I didn't receive any cash distribution?

Yes. Partnership income is taxable in the year it is earned by the partnership, regardless of whether cash is actually distributed to you. This is a fundamental aspect of pass-through taxation.

2. Can a K-1 show a loss that I can deduct?

Potentially, but only after applying the basis limitation, at-risk rules, and passive activity rules. If you pass all three tests, the loss is deductible in the current year. If not, it carries forward.

3. What if I receive a K-1 after I've already filed my return?

You should file an amended return (Form 1040-X) to include the K-1 information. This is also why filing for a personal extension using Form 4868 when you're waiting on K-1s is often a wise move.

4. Is a K-1 the same as a 1099?

No. A 1099 reports payments made directly to you (interest, dividends, freelance income, etc.). A K-1 reports your share of a pass-through entity's income, deductions, and credits — items that were earned at the partnership level but are taxable to you as a partner.

5. Do I need to file in every state where the partnership operates?

Possibly. If a partnership earns income in multiple states, partners may have nonresident filing obligations in those states. The K-1 or supplemental schedules should include state-specific information, but consulting a tax professional with multi-state experience is advisable.

6. How do I find the cost basis of my partnership interest?

You must track your basis yourself using historical K-1s, your initial investment records, and records of any additional contributions or distributions. The capital account shown on the K-1 is not the same as tax basis, though it can be a useful starting point if reported on a tax basis.

7. What is the difference between Schedule K and Schedule K-1?

Schedule K summarizes the total income, deductions, and credits of the entire partnership. Schedule K-1 allocates each individual partner's specific share of those totals. each individual partner's specific share of those totals.

8. Can my partnership e-file Form 1065?

Yes — in fact, the IRS generally requires e-filing for partnerships that file 10 or more returns of any type during the year (including W-2s and 1099s). Partnerships with more than 100 partners are also required to file electronically. TaxZerone makes it easy to e-file Form 1065 online, including automatic generation of Schedule K-1s for all partners.

Key IRS Resources for Schedule K-1 (Form 1065)

The IRS publishes official guidance that every partner and tax professional should be familiar with:

TaxZerone Internal Resources for Partnerships

If you're navigating partnership tax compliance, the following TaxZerone resources provide additional guidance: