Business Entities · Partnerships

Filing requirements, due dates, penalties, and audit notice requirements

Partnership compliance has two features that make it unlike anything else a preparer handles. The late-filing penalty is not measured by tax — a partnership owing nothing can accrue a five-figure penalty — and since the audit regime changed, the partners have no statutory right to be told that their own tax position is being examined. Both are consequences of the same design choice: the partnership is treated as the unit for procedural purposes even though it is not the taxpayer.

The rule

The return. every partnership must make a return for each taxable year stating its items of gross income and allowable deductions, with the names and addresses of those entitled to share in the taxable income if distributed (IRC § 6031(a))^TY2026

Statements to the partners. a partnership required to file must, on or before the day its return is due, furnish each person who was a partner or held an interest as a nominee at any time during the year with a copy of the information required to be shown on the return. That information may not be amended after the due date except where the partnership elected out under IRC § 6221(b), under the IRC § 6225(c) modification procedures, in connection with IRC § 6226 statements, or as regulations otherwise permit (IRC § 6031(b))^TY2026

When it is due. the 15th day of March following the close of a calendar year, or the 15th day of the third month following the close of a fiscal year (IRC § 6072(b))^TY2026

When the penalty applies. the penalty applies where a partnership required to file under IRC § 6031, or to file a partnership adjustment tracking report under IRC § 6226(b)(4)(A), fails to file at the time prescribed determined with regard to any extension, or files without the required information — for each month or fraction of a month the failure continues, up to 12 months, unless due to reasonable cause. It is in addition to the IRC § 7203 penalty for wilful failure to file (IRC § 6698(a))^TY2026

How it is computed. the monthly amount is the statutory figure multiplied by the number of persons who were partners in the partnership during any part of the taxable year — so the count is of everyone who was a partner at any point, not of those who were partners at the year end (IRC § 6698(b))^TY2026

And at what rate. $260 per partner per month for each month or fraction of one during which the failure continues, capped at 12 months, unless the failure is due to reasonable cause — the statute prints $195 and IRC § 6698(e) indexes it, rounding down to a multiple of $5 (IRC § 6698; Rev. Proc. 2025-32 § 3.55, for returns required to be filed in 2027)^TY2026

Consistency. a partner must treat any partnership-related item on their own return consistently with its treatment on the partnership return, and an underpayment resulting from a failure to do so is assessed and collected as if it were a mathematical or clerical error — with the IRC § 6213(b)(2) right to request abatement of such an assessment expressly disapplied (IRC § 6222(a), (b))^TY2026

Who speaks for the partnership. each partnership must designate a partner or other person with a substantial presence in the United States as the partnership representative, who has sole authority to act on behalf of the partnership; where no designation is in effect the Secretary may select any person. The partnership and all its partners are bound by the actions taken and by any final decision in a proceeding (IRC § 6223(a), (b))^TY2026

And what the partners lost. the prior IRC §§ 6223 and 6224 — which gave partners a right to notice of the beginning and completion of a partnership proceeding and rights to participate in it — were repealed by Pub. L. 114-74 § 1101 for returns filed for partnership taxable years beginning after 31 December 2017. Under the current regime the partnership representative acts alone and the partners have no statutory notice right^TY2026

Electronic filing. no person is required to file information returns electronically for a calendar year unless required to file at least 10 returns during that year, counted in aggregate across return types; a partnership with more than 100 partners must file electronically regardless (Reg. § 301.6011-2(c))^TY2026

Current figures

How it works in practice

The penalty is the item that produces the most client damage relative to how little it is thought about. It is charged for each month or fraction of a month the failure continues, multiplied by the number of persons who were partners during any part of the taxable year. Three features compound: a fraction of a month counts as a whole month, the partner count includes people who left mid-year, and the amount has nothing to do with the tax at stake. A twelve-partner partnership that files four months late accrues forty-eight partner-months of penalty on a return that may show a loss.

Two details decide most computations. The lateness runs from the due date determined with regard to any extension (IRC § 6698(a)(1)), so a partnership that extended is late only from the extended date. And the cap is twelve months, so a return years late is not penalised beyond a year — though the reasonable cause defence, not the cap, is where the real relief lies.

The rate is indexed and the statute does not print the current figure. IRC § 6698(b) gives a base amount that IRC § 6698(e) then adjusts, rounded down to a multiple of five dollars. Reading the section alone gives a number that has not been correct for many years, which is why the operative figure has to come from the annual revenue procedure.

The obligation to furnish partner statements sits alongside the return and carries its own timing: Schedules K-1 must reach the partners on or before the day the return is due. Note the restriction that follows in IRC § 6031(b) — the information furnished may not be amended after the due date except in four listed situations, all of which belong to the centralised audit regime. A partnership that discovers an error in a Schedule K-1 after the due date cannot simply reissue it.

IRC § 6222 is the provision that binds the partner to the partnership’s treatment, and its enforcement mechanism is unusually sharp. An underpayment resulting from inconsistent treatment is assessed as though it were a mathematical or clerical error — meaning no notice of deficiency, no Tax Court petition before assessment — and IRC § 6213(b)(2), which would ordinarily let a taxpayer request abatement of a math error assessment and force the Service to proceed by deficiency, is expressly disapplied. A partner who takes a different view from the partnership and does not notify the Service of the inconsistency has almost no procedural protection.

The audit regime is where the largest change sits. Under the current rules the partnership designates a partnership representative — a partner or other person with a substantial presence in the United States — who has sole authority to act for the partnership, and the partnership and all its partners are bound by what that person does and by any final decision in the proceeding. If no designation is in effect, the Service may select the representative.

What that replaced is the point worth knowing. The prior regime gave partners a statutory right to notice that a proceeding had begun and that it had concluded, and rights to participate in it. Those provisions were repealed for returns filed for partnership taxable years beginning after 2017. A partner in a partnership under examination today has no statutory entitlement to be told, and is nonetheless bound by the outcome. Whatever notice a partner receives comes from the partnership agreement, not from the Code — which makes a notice-and-consultation clause a substantive protection rather than boilerplate.

Scenarios

How this has changed

The centralised audit regime replaced its predecessor for returns filed for partnership taxable years beginning after 31 December 2017, and the change to partner rights is more radical than the change to mechanics.

Under the prior regime, partnerships above a size threshold were subject to unified proceedings in which each partner had a statutory right to notice that a proceeding had begun and that it had concluded, and a right to participate in it. A tax matters partner represented the partnership but did not displace those rights. Pub. L. 114-74 § 1101 repealed the notice and participation provisions and replaced the tax matters partner with a partnership representative who has sole authority. The representative need not even be a partner, and if the partnership fails to designate one the Service may choose.

The practical consequence is that a protection which used to come from the Code must now come from the partnership agreement. Any agreement drafted before 2016 that relies on the statutory notice rights is relying on provisions that no longer exist, and a limited partner who wants to know about an examination of their own tax position needs a contractual right to be told.

The IRC § 6698 penalty has not changed in structure. Its amount is indexed, which is a slower kind of change but one that makes any figure quoted from memory wrong within a few years — and the statute’s own printed number was last correct decades ago.

Exam focus

The penalty computation is the reliable question, and it has four inputs: the number of months, counting any fraction as a whole month; the number of persons who were partners at any time in the year; the rate for the year the return was required to be filed; and whether an extension moved the starting point. Distractors usually change one of these — most often substituting the year-end partner count or ignoring the extension.

Expect the due date to be tested alongside the S corporation date, since they are the same. Both are the fifteenth day of the third month, not the fourth.

For the audit material, the answer to “must the partners be notified” is no under the current regime, and the answer to “who may bind the partnership” is the partnership representative alone. A question set in a year before 2018 takes the opposite answers, so read the year.

Check yourself

1. A calendar-year partnership with seven partners files its Form 1065 for 2026 on 2 April 2027, having obtained no extension. For how many partner-months is the penalty charged?

Answer: seven. The return was due 15 March 2027, and 16 March to 2 April is a fraction of a month, which IRC § 6698(a) counts as a whole month. One month multiplied by seven partners gives seven partner-months. Whether the partnership had income or tax is irrelevant.

2. A partnership had eleven partners at 1 January, admitted two in June, and had one retire in August. How many partners are counted for the IRC § 6698 penalty?

Answer: thirteen. IRC § 6698(b)(2) counts the number of persons who were partners in the partnership during any part of the taxable year. The eleven at the start plus the two admitted in June are all partners during part of the year, and the one who retired in August is counted too — the count is cumulative, not a snapshot.

3. A partner disagrees with the partnership’s treatment of an item, reports it differently, and does not notify the Service. The Service assesses the resulting underpayment. What procedural rights does the partner have?

Answer: very few. IRC § 6222(b) provides that the underpayment is assessed and collected as if it were a mathematical or clerical error, so there is no notice of deficiency and no pre-assessment Tax Court petition — and it expressly disapplies IRC § 6213(b)(2), which would otherwise allow the partner to request abatement and force the Service to proceed by deficiency.

4. A partnership is under examination. Must the Service notify each partner that a proceeding has begun?

Answer: no, for partnership taxable years beginning after 2017. IRC § 6223(a) gives the partnership representative sole authority to act, and IRC § 6223(b) binds the partnership and all its partners. The former IRC §§ 6223 and 6224, which gave partners notice and participation rights, were repealed by Pub. L. 114-74 § 1101. Any notice right must come from the partnership agreement.

5. A partnership discovers in June, three months after its return was filed on the 15 March due date, that a Schedule K-1 overstated a partner’s share of income. May it furnish an amended statement?

Answer: not simply by reissuing it. IRC § 6031(b) prohibits amending the information furnished after the due date of the return except in four cases: where the partnership elected out under IRC § 6221(b), under the IRC § 6225(c) modification procedures, in connection with IRC § 6226 statements, or as regulations otherwise permit. The correction has to be made through one of those routes.