A partnership that files Form 1065 after the deadline, or files it missing required partner information, is charged $255 per partner for each month the return is late, up to 12 months.1Internal Revenue Service. Failure to File Penalty The Form 1065 late filing penalty is assessed against the partnership itself under IRC Section 6698, not against individual partners, and it applies even though the partnership typically owes no federal income tax of its own. Because the charge multiplies across every partner and every month, a mid-sized partnership can rack up tens of thousands of dollars from one missed deadline.
When the Penalty Applies
Two situations trigger the charge. The first is simply failing to file Form 1065 by the due date, including any approved extension.2Office of the Law Revision Counsel. 26 USC 6698 – Failure to File Partnership Return The second is filing a return that leaves out information Section 6031 requires, including each partner’s name and address and the amount of their distributive share.3Office of the Law Revision Counsel. 26 U.S. Code 6031 – Return of Partnership Income A return missing any of those details is treated the same as no return at all.
Form 1065 is due on the 15th day of the third month after the partnership’s tax year ends.4Internal Revenue Service. Publication 509 (2026), Tax Calendars For a calendar-year partnership, that’s March 15. Filing Form 7004 before the original deadline buys an automatic six-month extension, pushing a calendar-year filer to September 15. No explanation or approval is required.
The extension only moves the filing date. Schedule K-1s are still due to partners by the original deadline. And if a partnership files Form 7004 on time but then misses the extended date, the penalty clock runs from the extended due date forward.
A boundary worth knowing: a multi-member LLC that hasn’t elected corporate tax treatment is treated as a partnership for federal tax purposes and files Form 1065. The same Section 6698 penalty applies. First-year LLCs are often caught off guard by this.
How the Penalty Is Calculated
The formula has two variables: the number of partners and the number of months late. For returns required to be filed in 2026, the rate is $255 per partner per month.5Internal Revenue Service. Revenue Procedure 2024-40 The penalty applies for each month or fraction of a month the failure continues, capped at 12 months.2Office of the Law Revision Counsel. 26 USC 6698 – Failure to File Partnership Return
That “fraction of a month” language is the sting. A return filed two months and one day late counts as three full months. Being one day past a monthly anniversary adds another full month.
A few quick examples:
- 5 partners, 3 months late: $255 × 5 × 3 = $3,825
- 5 partners, 12 or more months late: $255 × 5 × 12 = $15,300 (the cap holds no matter how long the return stays unfiled)
- 20 partners, 6 months late: $255 × 20 × 6 = $30,600
The partner count includes anyone who was a partner during any part of the tax year, not just those on the books at year-end. A partnership that started with 10 partners, bought out three mid-year, and ended with seven can still be penalized based on all 10.
The Small Partnership Exception
Revenue Procedure 84-35 gives certain small partnerships a reliable way out, but it isn’t an exemption from filing. It creates a presumption of reasonable cause for partnerships that meet five conditions, effectively shielding them from the penalty.6Internal Revenue Service. PMTA-2020-01
All five must be true:
- The partnership has 10 or fewer partners. A married couple filing jointly counts as one.
- Every partner is a natural person (other than a nonresident alien) or the estate of a deceased partner. A trust, S corporation, C corporation, or another partnership as a partner disqualifies the partnership.7Internal Revenue Service. Understanding Your CP162A Notice
- Each partner’s share of every item of income, deduction, and credit is allocated in the same proportion. Special allocations knock the partnership out.
- Each partner reported their full share of partnership income, deductions, and credits on a timely filed individual return.6Internal Revenue Service. PMTA-2020-01
- The partnership did not elect to be subject to the consolidated audit procedures in place when the revenue procedure was issued.
The logic: if every partner already reported everything correctly, the informational purpose of Form 1065 was served even without the form itself. Relief isn’t automatic. The partnership raises the exception as a defense after a penalty is proposed and must be ready to show it meets all five criteria.
One point of confusion is worth flagging. The exception does not treat C corporations as qualifying partners, even though an older TEFRA definition did.8Internal Revenue Service. Understanding Your CP162B Notice If any partner is an entity rather than an individual or estate, Revenue Procedure 84-35 is unavailable.
First Time Abate
Partnerships with a clean compliance record have a separate, often faster route: the First Time Abate administrative waiver. This is IRS policy, not a statutory right, and it waives the penalty for taxpayers who meet two conditions:9Internal Revenue Service. Administrative Penalty Relief
- The partnership filed all required returns for the three tax years before the penalty year, and either had no penalties during that period or had any prior penalties removed for a reason other than FTA.
- The partnership has filed all currently required returns or has a valid extension in place.
FTA is usually the fastest option because it doesn’t require proving anything about why the return was late. You can request it by calling the IRS or by including the request in a written response to the penalty notice. If FTA is denied, a reasonable cause request is still available, so there’s no reason not to try FTA first.
Reasonable Cause Abatement
A partnership that doesn’t qualify for the small partnership exception or FTA can still seek relief by showing reasonable cause. The standard is demanding: the partnership must demonstrate that it exercised ordinary business care and prudence and still could not file on time.2Office of the Law Revision Counsel. 26 USC 6698 – Failure to File Partnership Return
Circumstances the IRS has accepted include the death or serious illness of the managing partner or the partnership’s tax professional, destruction of records in a fire or natural disaster, and the inability to obtain records needed to file. What consistently fails: forgetting the deadline, lacking money to pay a preparer, or relying on someone who turned out to be unqualified.
The formal request goes on Form 843, Claim for Refund and Request for Abatement.10Internal Revenue Service. Instructions for Form 843 Attach documentation that tells the full story: medical records, death certificates, police or fire reports, or detailed partner statements describing what happened and what was done to comply as quickly as possible. Vague hardship assertions rarely succeed. Specificity does the work.