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Form 1065 & K-1 Filing

Partnership Tax Returns

Partnerships don’t pay federal income tax themselves. Instead, the partnership files Form 1065 as an information return, and each partner receives a Schedule K-1 showing their share of income, deductions, and credits. The partners then report those amounts on their own individual returns. That pass-through structure sounds simple enough, but the filing mechanics — and the penalties for getting them wrong — trip up a lot of business owners every year.

When Is the Partnership Tax Return Due Date?

The partnership tax return due date is March 15 for calendar-year partnerships. If your partnership uses a fiscal year, the return is due on the 15th day of the third month after the fiscal year ends.

March 15 catches people off guard because it falls a full month before individual returns are due on April 15. The IRS set it up that way on purpose — partners need their K-1s in hand before they can file their own 1040s.

You can request a six-month extension using Form 7004, which pushes the partnership tax return due date to September 15 for calendar-year filers. But here’s the part that matters: even with an extension, the K-1s still need to go out to partners. An extension gives the partnership more time to file with the IRS, but it doesn’t give your partners more time to file their personal returns unless they also file extensions.

If the partnership tax return due date falls on a weekend or federal holiday, the deadline moves to the next business day. Always check the calendar — in some years March 15 lands on a Saturday, which pushes the actual due date to Monday the 17th.

What Is Form 1065 and How Does It Work?

Form 1065 is the U.S. Return of Partnership Income. Every domestic partnership — and most LLCs taxed as partnerships — has to file one annually, regardless of whether the business made money or lost money that year.

The form itself reports the partnership’s total income, deductions, gains, losses, and credits. But those numbers don’t generate a tax bill for the partnership. They flow through to the individual partners via Schedule K-1 (Form 1065), which breaks out each partner’s allocable share.

What Goes on Form 1065

Gross receipts and cost of goods sold — total revenue minus direct costs of whatever the partnership sells or delivers
Ordinary business deductions — salaries, rent, utilities, insurance, depreciation, and other expenses that reduce ordinary income
Separately stated items — capital gains, Section 1231 gains, charitable contributions, interest income, and rental activity. These get reported separately because they’re taxed differently on each partner’s personal return
Partner capital accounts — Schedule K-1 shows each partner’s beginning and ending capital, plus contributions and distributions during the year. The IRS now requires tax-basis capital account reporting

One thing worth knowing: a two-member LLC that doesn’t elect corporate treatment is classified as a partnership for tax purposes. It files Form 1065 the same way a general or limited partnership does.

Schedule K-1: What Partners Actually Receive

Each partner gets a Schedule K-1 showing their share of the partnership’s income, deductions, and credits for the year. The allocation follows whatever percentages are laid out in the partnership agreement — which isn’t always a straight split.

K-1s can be straightforward or maddeningly complex depending on the partnership’s activities. A two-person consulting firm might have a one-page K-1 with ordinary business income and a few deductions. A real estate partnership with depreciation, Section 754 adjustments, and debt allocations might produce a K-1 that runs several pages with footnotes.

Items That Show Up on Schedule K-1

Box 1: Ordinary business income or loss — the partner’s share of net profit from regular operations
Box 2-3: Rental income and other net rental income — reported separately because passive activity rules apply
Boxes 5-7: Interest, dividends, and royalties — investment-type income passed through to partners
Box 8-9a: Net capital gains — short-term and long-term, reported on the partner’s Schedule D
Box 13: Deductions — charitable contributions and other items that flow to the partner’s itemized deductions
Box 14: Self-employment earnings — general partners owe self-employment tax on this amount; limited partners typically don’t
Box 19-20: Distributions and capital account — cash and property the partner received, plus the year-end capital balance

Late Filing Penalties for Partnerships

The penalty for filing Form 1065 late is $235 per partner per month (for tax year 2024 returns). That number gets adjusted for inflation periodically. The penalty caps at 12 months, so the maximum is $2,820 per partner.

For a four-partner firm that files three months late, that’s $235 × 4 partners × 3 months = $2,820. It adds up fast, and the IRS doesn’t waive it easily.

The penalty applies even if the partnership owes no tax — because partnerships don’t pay tax. The penalty is for failing to file the information return on time, not for failing to pay. A lot of first-time partnership filers learn this the hard way.

If you have reasonable cause for filing late (not just forgetting), you can request penalty abatement by attaching a statement to the return or writing to the IRS. First-time penalty abatement is available if the partnership has a clean compliance history for the prior three years.

Common Mistakes on Partnership Tax Returns

After preparing partnership returns for years, certain mistakes keep showing up. Most of them are avoidable with a little planning before the partnership tax return due date arrives.

Inconsistent Partnership Agreements

The IRS expects the allocations on the K-1s to match the partnership agreement. If the agreement says 50/50 but the return allocates 60/40, that creates a problem. Worse, if there’s no written agreement at all, the IRS defaults to equal sharing — which might not reflect the actual economic arrangement.

Missing the Basis Limitation

Partners can only deduct losses up to their adjusted basis in the partnership. If a partner’s basis is zero, losses carry forward — they don’t disappear, but they can’t be used yet. Tracking basis is the partner’s responsibility (not the partnership’s), and it’s one of the most commonly overlooked requirements.

Forgetting State Filing Requirements

Partnerships that operate in multiple states often need to file returns in each state where they do business. New York, California, and several other states also impose entity-level taxes or fees on partnerships, separate from the individual partner’s state return obligations.

Not Electing Section 754 When It Matters

When a partner buys into an existing partnership or a partner dies, a Section 754 election adjusts the inside basis of partnership assets to reflect the purchase price. Without this election, the new partner could end up paying tax on gains that were already baked into the price they paid. It’s one of the most valuable (and most overlooked) elections in partnership tax.

Partnership vs. S Corporation: Which Files What

Partnerships file Form 1065. S corporations file Form 1120-S. Both are pass-through entities, and both issue K-1s to their owners. The differences are in how self-employment tax works and how owners pay themselves.

General partners owe self-employment tax (15.3% on the first $168,600 of earnings in 2024, then 2.9% above that) on their share of partnership income. S corporation shareholders who work in the business pay themselves a salary (subject to payroll tax) and take the remaining profit as distributions (not subject to self-employment tax).

That’s the main reason a lot of profitable partnerships end up converting to S corps — the self-employment tax savings can be significant once earnings are high enough. But it’s not always the right move. Partnerships offer more flexibility in how income gets allocated among owners, and they don’t have the same restrictions on ownership structure that S corps do.

We walk through the entity comparison in more detail on our business entity selection guide.

How We Handle Partnership Returns at The Reed Corporation

We prepare partnership returns for firms ranging from two-person consulting LLCs to multi-member real estate partnerships with complex waterfall allocations. The scope of work depends on the partnership’s structure and activities, but the process generally covers:

Reviewing the partnership agreement to confirm allocation percentages and special provisions
Preparing Form 1065 with all required schedules (Schedules K, L, M-1 or M-3, and capital account reconciliation)
Issuing Schedule K-1s to each partner in time for individual return preparation
Filing in all required states — we handle multi-state partnerships regularly
Tracking partner basis and coordinating Section 754 elections when applicable

If you’re not sure whether your LLC should be filing as a partnership or whether a different entity structure would save you money, that’s exactly the kind of conversation we have with clients before the partnership tax return due date. The answer depends on how much the business earns, how many owners are involved, and what the exit plan looks like.

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Frequently Asked Questions

What is the partnership tax return due date for 2025?

For calendar-year partnerships, the partnership tax return due date is March 15, 2025. If that date falls on a weekend or federal holiday, the deadline shifts to the next business day. You file Form 1065 with the IRS, and each partner receives a Schedule K-1 showing their share of income, deductions, and credits. If you need more time, file Form 7004 by the original partnership tax return due date to request a six-month extension, which pushes the deadline to September 15, 2025. Keep in mind that the extension only gives you more time to file the return — it doesn’t extend the time your partners have to file their own individual returns unless they separately request extensions on their 1040s. Fiscal-year partnerships follow a different schedule: their return is due on the 15th day of the third month after the fiscal year closes. So a partnership with a June 30 fiscal year end would have a partnership tax return due date of September 15. Regardless of the filing method, the late filing penalty of $235 per partner per month applies immediately when the return is overdue, and it stacks up quickly for partnerships with several members.

Does a partnership pay income tax or is it just the partners?

A partnership does not pay federal income tax. It’s what the IRS calls a pass-through entity, which means the partnership files Form 1065 as an information return — it reports how much the business earned and how those earnings get divided — but the actual tax liability falls on the individual partners. Each partner receives a Schedule K-1 after the partnership tax return due date passes, and that K-1 shows their allocable share of income, deductions, gains, losses, and credits. The partner then reports those amounts on their personal Form 1040. General partners typically owe self-employment tax (currently 15.3% up to the Social Security wage base) on their share of ordinary business income, which is one of the main reasons profitable partnerships sometimes convert to S corporation status. Limited partners generally don’t owe self-employment tax on their distributive share, though this gets complicated when a limited partner also provides services to the partnership. Some states — New York and California among them — impose separate entity-level taxes or fees on partnerships regardless of the federal pass-through treatment, so the “partnerships don’t pay tax” rule has notable exceptions at the state level.

What happens if I file my partnership tax return late?

Filing after the partnership tax return due date triggers an automatic penalty of $235 per partner per month (or fraction of a month) that the return is late, up to a maximum of 12 months. That penalty applies per partner, not per partnership, which is the part that surprises people. A five-partner firm that’s two months late owes $235 × 5 × 2 = $2,350 in penalties — even if the partnership had zero income for the year. The IRS assesses this penalty because Form 1065 is an information return, not an income tax return. The penalty exists to ensure the government receives the information it needs to verify each partner’s individual filing. If you have a clean compliance history for the prior three tax years, you can request first-time penalty abatement, which the IRS grants fairly readily. Beyond that, you’d need to demonstrate reasonable cause — a genuine hardship or circumstance outside your control, not just forgetting the partnership tax return due date or assuming your accountant handled it. Filing Form 7004 before the deadline avoids the penalty entirely by extending the due date six months, and there’s no cost or approval process for the extension. It’s one of the easiest protective steps a partnership can take.

What is the difference between Form 1065 and Schedule K-1?

Form 1065 is the partnership’s tax return — the document filed with the IRS that reports the total income, deductions, and other tax items for the business as a whole. Schedule K-1 is the individual statement given to each partner showing their specific share of those amounts. Think of Form 1065 as the full picture and Schedule K-1 as each partner’s slice. The partnership prepares one Form 1065 and generates a separate Schedule K-1 for every partner. The K-1 breaks out items that receive different tax treatment on the partner’s personal return: ordinary income in Box 1, rental income in Boxes 2-3, interest and dividends in Boxes 5-6, capital gains in Boxes 8-9a, and self-employment earnings in Box 14. Partners don’t file the K-1 by the partnership tax return due date — they attach it to their own Form 1040 when they file their individual return in April. The reason the partnership tax return due date is set at March 15 rather than April 15 is specifically so that K-1s reach partners in time for individual filing season. When a partnership requests an extension, it delays the Form 1065 filing but can create problems for partners who need their K-1 information to complete their own returns on time.

Can a two-member LLC file as a partnership?

Yes — in fact, a two-member LLC is automatically classified as a partnership for federal tax purposes unless the members elect otherwise. There’s no special application required. By default, the IRS treats any unincorporated business with two or more members as a partnership, which means the LLC files Form 1065 and issues Schedule K-1s to each member. The partnership tax return due date of March 15 applies the same way it would for a traditional general or limited partnership. The LLC can elect to be taxed as a corporation by filing Form 8832 (Entity Classification Election) or as an S corporation by filing Form 2553, but most two-member LLCs stick with partnership classification because it offers the most flexibility in allocating income among members. Partnership tax treatment lets members split profits and losses in proportions that differ from their ownership percentages, as long as the allocations have substantial economic effect under Section 704(b). That kind of flexibility doesn’t exist with S corporation taxation, where distributions must follow ownership percentages. The tradeoff is self-employment tax: general partners owe it on their share of business income, while S corporation shareholders can manage it through salary payments. We cover that comparison in detail on our business entity selection guide.