If you need to correct a Form 1065 you already filed, the method depends on whether your partnership is subject to the centralized partnership audit regime created by the Bipartisan Budget Act of 2015. Non-BBA partnerships file an amended Form 1065 (electronically, with the Amended Return box checked) or a paper Form 1065-X. BBA partnerships cannot file a traditional amended return at all and must instead file an Administrative Adjustment Request (AAR). Picking the wrong path gets the filing rejected and can expose every partner to penalties.
Figure Out Whether Your Partnership Is BBA or Non-BBA
The BBA regime applies to every partnership for tax years beginning after December 31, 2017, unless the partnership affirmatively elected out on a timely filed return for the year in question.1Internal Revenue Service. Centralized Partnership Audit Regime (BBA) A partnership can elect out only if it meets both of these conditions:2Internal Revenue Service. Elect Out of the Centralized Partnership Audit Regime
- It has 100 or fewer partners, counting every Schedule K-1 the partnership must issue. If any partner is an S corporation, the S corporation’s shareholders count toward the total.
- Every partner is an eligible type: individuals, C corporations, S corporations, foreign entities that would be treated as C corporations if domestic, and estates of deceased partners. A partnership with any partner that is itself a partnership, a trust, a disregarded entity, or a nominee cannot elect out.
If the partnership made that election for the year you’re correcting, use the amended return process. If it did not, you must use the AAR process, even if the correction seems small.
Can You Supersede Instead of Amend?
If you catch the error before the original filing deadline (including any extension), file a superseding return rather than an amended one. A superseding return replaces the original entirely and is treated as if the original was never filed.3Taxpayer Advocate Service. What to Know About Superseding Tax Returns and How It Could Benefit You You can file more than one as long as each lands before the deadline expires.
This matters because a superseding return sidesteps the AAR machinery and avoids forcing partners to amend their own returns if they haven’t filed yet. Partnerships that extended their return keep that window open longer, which helps when late K-1s from underlying investments drive the correction. Once the deadline (including extensions) passes, superseding is off the table.
How Non-BBA Partnerships File a 1065 Amended Return
Non-BBA partnerships use different forms depending on how they file.
Electronic Filing
For e-filing, prepare a complete, corrected Form 1065 with all schedules, and check the Amended Return box.4Internal Revenue Service. Guidance for Amended Partnership Returns Attach a statement titled “Amended Return Statement” that identifies every changed line item, shows the corrected amount, and explains why each change was made. Include every form and schedule that changed or supports a change. If you forget to check the Amended Return box, the IRS will reject the submission as a duplicate.
Partnerships with more than 100 partners are generally required to file electronically, and the mandate covers amended returns. A partnership that cannot meet the e-file requirement can request a waiver from the IRS.4Internal Revenue Service. Guidance for Amended Partnership Returns
Paper Filing
Non-BBA partnerships filing on paper use Form 1065-X instead of refiling Form 1065.5Internal Revenue Service. Instructions for Form 1065-X The form has three columns: (a) amounts originally reported, (b) net increase or decrease, and (c) corrected amount. Part V requires a detailed explanation of the reasons for each change. Attach any supporting schedules or forms, and mark any previously filed forms being resubmitted with “Copy Only — Do Not Process” at the top. Mail the package to the IRS address for the partnership’s principal place of business, listed by state in the Form 1065 instructions.
How BBA Partnerships File an Administrative Adjustment Request
BBA partnerships cannot file an amended 1065. They file an AAR, and the AAR carries its own forms and consequences.6Internal Revenue Service. File an Administrative Adjustment Request for a BBA Partnership
The Filing Itself
An electronically filed AAR requires Form 8082 (Notice of Inconsistent Treatment or Administrative Adjustment Request) together with a Form 1065 that has the Amended Return box checked for transmission.6Internal Revenue Service. File an Administrative Adjustment Request for a BBA Partnership A paper AAR uses Form 1065-X instead.5Internal Revenue Service. Instructions for Form 1065-X Only the partnership representative has authority to file an AAR; the partnership and all partners are bound by that representative’s actions and elections.7Internal Revenue Service. 8Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 The calculation ignores individual partner circumstances. A partner in a lower bracket, or a tax-exempt partner, still gets effectively taxed at 37% when the partnership pays.
The Push-Out Election
Because the partnership-level rate is punishing, most partnerships elect to push the adjustments out to the partners who were partners during the reviewed year. The partnership makes the push-out election on the AAR and must include Form 8985 (the transmittal) and a Form 8986 for each partner’s share of the adjustments.6Internal Revenue Service. File an Administrative Adjustment Request for a BBA Partnership
Partners who receive a Form 8986 do not amend their prior-year return. They report the adjustments on the return for the year they receive the statement, using Form 8978 to calculate the tax effect. If a reviewed-year partner is itself a pass-through entity, that entity can either push the adjustments further to its own partners or compute and pay its own imputed underpayment.
When the AAR produces adjustments that do not result in an imputed underpayment (for example, the corrections reduce reported income), the push-out election is mandatory. The partnership-level payment option is not available in that situation.9Office of the Law Revision Counsel. 26 U.S. Code 6227 – Administrative Adjustment Request by Partnership
Corrected Schedules K-1
Any change to the Form 1065 flows through to the partners, so you have to issue corrected Schedules K-1 for every affected partner. Mark each corrected K-1 “Amended” and include it with the amended return or AAR filing.4Internal Revenue Service. Guidance for Amended Partnership Returns Notify partners promptly and explain how the revisions affect them.
Partners who have already filed face follow-up work. Individuals file Form 1040-X to correct their returns.10Internal Revenue Service. About Form 1040-X, Amended U.S. Individual Income Tax Return Corporate partners use Form 1120-X.11Internal Revenue Service. About Form 1120-X, Amended U.S. Corporation Income Tax Return The one exception: partners of BBA partnerships who receive push-out statements on Form 8986 use Form 8978 on their current-year return rather than amending the prior year.
Deadlines
The window to correct a partnership return isn’t open indefinitely.
For BBA partnerships, an AAR must be filed within three years after the later of the date the partnership return was filed or the last day for filing the return, determined without extensions.9Office of the Law Revision Counsel. 26 U.S. Code 6227 – Administrative Adjustment Request by Partnership Once the IRS mails a notice of administrative proceeding for that tax year, the AAR window closes.
For non-BBA partnerships and for individual partners seeking refunds, the general rule allows a claim within three years from the date the return was filed or two years from the date the tax was paid, whichever is later.12Internal Revenue Service. Time You Can Claim a Credit or Refund Form 1065 is informational and the partnership itself pays no income tax, so the three-years-from-filing measure is what matters at the partnership level. A return filed before the due date is treated as filed on the due date for this calculation.
If the amendment produces additional tax owed by a partner, that partner should pay promptly. Interest on underpayments runs from the original due date of the return, no matter when the amendment is filed.
Penalties and Interest
Correcting errors voluntarily beats waiting for the IRS to find them, because partnership penalties scale by partner.
A partnership that filed its original return late faces a penalty of $245 per partner, per month or partial month the return is late, capped at 12 months.13Internal Revenue Service. Information About Your Notice, Penalty and Interest For a 10-partner partnership, that hits $29,400 at the cap. The penalty attaches to the original return rather than the amendment, but partnerships that discover they never filed at all need to understand the exposure.
When an amendment surfaces an underpayment attributable to negligence or a substantial understatement of income, the IRS can impose a 20% accuracy-related penalty on the underpaid amount.14Internal Revenue Service. Accuracy-Related Penalty For individual partners, a substantial understatement exists when the understatement exceeds the greater of 10% of the tax that should have been shown on the return or $5,000. For C corporation partners, the threshold is the lesser of 10% of the correct tax (or $10,000 if greater) and $10 million. Voluntarily correcting errors before the IRS contacts you generally strengthens a reasonable-cause defense, though it doesn’t guarantee one.
Interest on underpayments runs from the original due date until payment. Penalties can sometimes be abated for reasonable cause; interest is set by statute, and the IRS has no authority to waive it.