Yes — partnerships do file tax returns. Every partnership must file an annual information return with the IRS on Form 1065, which reports the business’s income, deductions, gains, and losses for the year.1Office of the Law Revision Counsel. 26 U.S. Code 6031 – Return of Partnership Income The partnership itself does not pay income tax on that return. Instead, the numbers flow through to each partner, who reports their share on their own personal return and pays tax there.
Why Partnerships File but Don’t Pay
A partnership is a pass-through entity. Because each partner already reports their share of partnership income on their individual return, taxing the same income again at the entity level would be double taxation. Form 1065 exists so the IRS can see the full picture of what the business earned and how it was divided, then match those figures against what individual partners report.
The filing requirement applies whether the business made money, broke even, or lost money during the year.2eCFR. 26 CFR 1.6031(a)-1 A losing year does not excuse the return.
Which Businesses Have to File Form 1065
Form 1065 covers more entity types than the name suggests. General partnerships, limited partnerships, and limited liability partnerships all file it. So do multi-member LLCs that have not elected to be taxed as a corporation — the IRS treats them as partnerships by default.3Internal Revenue Service. About Form 1065, U.S. Return of Partnership Income A two-member LLC with no special election is a partnership for tax purposes, full stop.
A single-member LLC is the boundary case. It does not file Form 1065. The IRS treats it as a disregarded entity, and the owner reports the business’s activity on their own return, usually on Schedule C. Forming an LLC by itself does not determine which return you file; the number of owners and any tax elections do.
What the Return Reports
Form 1065 opens with the partnership’s Employer Identification Number, the date the business began operations, and the accounting method it uses.3Internal Revenue Service. About Form 1065, U.S. Return of Partnership Income From there it captures the year’s full financial picture: gross receipts, cost of goods sold, ordinary business expenses like rent and salaries, and capital gains or losses.
The return also lists everyone who held a partnership interest at any point during the year, with legal name, address, and Taxpayer Identification Number. That data feeds directly into each partner’s Schedule K-1, so errors here create mismatches with the IRS downstream.
Schedule K-1 for Each Partner
Once Form 1065 is complete, the partnership generates a Schedule K-1 for every partner. The K-1 breaks out that partner’s share of income, deductions, credits, and other tax items based on their ownership percentage.4Internal Revenue Service. 2025 Partner’s Instructions for Schedule K-1 (Form 1065) The totals across all K-1s must match the master Form 1065; any discrepancy is the sort of mismatch that draws IRS attention.
Partners use the K-1 to fill in the right lines on their own Form 1040. Ordinary business income, rental income, interest, dividends, capital gains, and separately stated deductions and credits all travel through the K-1. Partners generally do not file the K-1 itself with their personal return, but they need it to complete that return.
For calendar-year partnerships, each partner must receive their K-1 by March 15 — the same day the partnership return is due.5Internal Revenue Service. Publication 509 (2026), Tax Calendars Fiscal-year partnerships follow the same rule adjusted to their year-end: the 15th day of the third month after the tax year closes.
When Form 1065 Is Due
The partnership return is due on the 15th day of the third month after the close of the tax year. For calendar-year partnerships, that’s March 15.5Internal Revenue Service. Publication 509 (2026), Tax Calendars A partnership with a June 30 year-end would file by September 15, and so on.
If the partnership needs more time, it files Form 7004 for an automatic six-month extension.6Internal Revenue Service. About Form 7004, Application for Automatic Extension of Time to File Certain Business Income Tax, Information, and Other Returns No justification is required. For calendar-year partnerships, the extension pushes the deadline to September 15. Keep in mind that this is an extension to file the partnership return, not an extension for partners to pay their individual tax; partners still owe their estimated tax on schedule. An extension also delays K-1 delivery, which often forces partners to extend their own personal returns.
Partnerships filing 10 or more returns of any type during the year — income tax, information, employment tax, and excise tax returns combined — must file Form 1065 electronically.7Internal Revenue Service. Topic No. 801, Who Must File Information Returns Electronically Most partnerships with employees cross that threshold quickly once W-2s and other information returns are counted.
What Partners Themselves Owe
Filing Form 1065 is only half the picture. Because tax on partnership income is paid at the partner level, each partner has their own obligations to manage.
Self-Employment Tax
A general partner’s distributive share of partnership income is generally subject to self-employment tax, which covers Social Security and Medicare. This applies whether the partnership actually distributed cash or not; the SE tax follows the allocated share.4Internal Revenue Service. 2025 Partner’s Instructions for Schedule K-1 (Form 1065)
Limited partners get different treatment. Under Section 1402(a)(13), a limited partner’s share of partnership income is generally not subject to self-employment tax, except for guaranteed payments received for services. The line between general and limited partner status can be less clear for LLC members who don’t fit neatly into either category. If both spouses are partners, each files a separate Schedule SE for their own share of earnings.
Quarterly Estimated Tax
Partnerships do not withhold income tax from distributions the way an employer withholds from wages. So partners have to make their own estimated tax payments through the year. If you expect to owe $1,000 or more in tax after withholding and refundable credits, the IRS expects quarterly payments.8Internal Revenue Service. Form 1040-ES – Estimated Tax for Individuals
For 2026, the quarterly due dates are April 15, 2026; June 15, 2026; September 15, 2026; and January 15, 2027.
Missing or underpaying an installment triggers an underpayment penalty at a floating rate — 7% per year as of early 2026, compounded daily.9Internal Revenue Service. Interest Rates Remain the Same for the First Quarter of 2026 You can generally avoid the penalty if you pay at least 90% of your current year’s tax or 100% of last year’s through withholding and estimated payments combined. Partners with prior-year adjusted gross income above $150,000 need to cover 110% of the prior year’s tax for that safe harbor.10Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
What Late or Incomplete Filing Costs
Filing Form 1065 late — or filing one missing required information — costs $255 per partner for each month or partial month the failure continues, up to a 12-month maximum.11Internal Revenue Service. Failure to File Penalty The math adds up fast. A five-partner partnership four months late owes $5,100 in penalties even if the entity itself owes no tax.
The penalty applies for every partner who was a member at any point during the tax year, not just those active at year-end. The statutory base of $195 is adjusted annually for inflation, reaching $255 for returns due after December 31, 2025.12Office of the Law Revision Counsel. 26 U.S. Code 6698 – Failure to File Partnership Return
The IRS may abate the penalty if the partnership shows reasonable cause. If a penalty notice arrives, send a written explanation to the IRS; do not attach it to the return itself.13Internal Revenue Service. Instructions for Form 1065 (2025) – Section: Penalties A first-time abatement request is worth making if the partnership has an otherwise clean compliance record.
Fixing a Return After Filing
Mistakes get corrected on Form 1065-X, which functions as either an amended return or an Administrative Adjustment Request depending on the partnership’s situation.14Internal Revenue Service. About Form 1065-X, Amended Return or Administrative Adjustment Request (AAR) Most partnerships with taxable years beginning after 2017 fall under the Bipartisan Budget Act centralized audit rules and must file an AAR rather than a traditional amended return to correct partnership-related items.15Internal Revenue Service. File an Administrative Adjustment Request for a BBA Partnership
When filing an AAR, the partnership also issues corrected Schedule K-1 forms to affected partners. Fixing errors on your own timeline is far better than having the IRS surface them in an audit, where the partnership loses control over how adjustments are handled and can face additional penalties and interest.