Form K-3: Filing Requirements, Domestic Exception, and Penalties

Schedule K-3 is the international-tax companion to Schedule K-1. Partnerships filing Form 1065 and S corporations filing Form 1120-S use it to report each owner’s share of foreign income, foreign taxes, and other cross-border items, so that partner or shareholder can complete the international portions of their own return. If the entity has any items of international tax relevance, and no exception applies, it must prepare Schedules K-2 and K-3 and furnish a K-3 to every owner.

Why Schedule K-3 Exists

Schedule K-1 reports each owner’s share of the entity’s domestic income, deductions, and credits. It was never built to carry the detail that international tax rules demand. Schedule K-3 fills that gap by breaking out the foreign income, foreign taxes, and other cross-border items owners need to report correctly on their own returns.¹

The entity-level counterpart, Schedule K-2, reports the same international data in aggregate to the IRS. K-2 goes to the IRS with the entity return; K-3 goes to the IRS and to each owner.

Who Has to File

Any domestic partnership filing Form 1065 or S corporation filing Form 1120-S with items of international tax relevance must prepare Schedules K-2 and K-3.²

That phrase covers a lot of ground: earning foreign-source income, paying or accruing foreign taxes, owning interests in foreign corporations or partnerships, operating foreign branches, or having foreign partners or shareholders. A small amount of foreign dividend income on a brokerage statement can be enough to trigger the requirement.

The Domestic Filing Exception

The IRS provides a Domestic Filing Exception (DFE) that lets qualifying partnerships skip Schedules K-2 and K-3 entirely. All four criteria must be met.³

No or limited foreign activity. The partnership has no foreign activity, or its only foreign activity is passive-category income on which no more than $300 of creditable foreign taxes were paid or accrued, and those amounts appear on a payee statement furnished to the partnership. Foreign activity includes foreign-source income, foreign taxes, and any ownership interest in a foreign entity.
All-domestic ownership. Every direct partner must be a U.S. citizen, resident alien, domestic estate with only U.S. beneficiaries, domestic grantor or non-grantor trust with only U.S. grantors and beneficiaries, S corporation, qualifying single-member LLC, or another domestic partnership whose own partners all meet these same requirements.⁴
Timely partner notification. The partnership must tell every partner that they will not receive a K-3 unless they request one, no later than when it furnishes the K-1.
No K-3 requests received by the one-month date. No partner may have requested a K-3 on or before the date one month before the partnership files its Form 1065. For calendar-year partnerships filing on extension, the latest one-month date for tax year 2025 is August 15, 2026.

The exception is all or nothing. If any partner requests a K-3 by the one-month deadline, the partnership must prepare and file K-2 and K-3 for every partner, not just the one who asked. The IRS also keeps the right to request the K-2 and K-3 at any time, so an entity relying on the DFE should keep records that prove it met all four conditions.

What the Form Reports

Schedule K-3 for Form 1065 runs to twelve parts, each covering a different area of international tax. Most filers only complete the parts that apply to them.⁵ The 1120-S version follows the same logic with fewer parts; GILTI and Subpart F information appears in Part V rather than Part VI.¹

Foreign Tax Credit Data (Parts II and III)

Part II is the heart of the form for most recipients. It breaks the partnership’s foreign income and the partner’s share of it down by source and by separate category, or “basket”: passive, general, foreign branch, and Section 951A (GILTI). The split matters because the foreign tax credit limitation applies to each basket on its own; excess credits in one category cannot offset taxes in another.

Part III supplies the allocation and apportionment factors that feed the credit limitation calculation, including research and experimental expense factors, interest expense factors, and the partner’s share of creditable foreign taxes paid or accrued. Together, Parts II and III give a partner what they need to complete Form 1116 (for individuals) or Form 1118 (for corporations).⁶

GILTI and Subpart F Inclusions (Part VI)

Part VI reports the partner’s share of income inclusions from controlled foreign corporations, including GILTI under Section 951A and Subpart F income under Section 951(a)(1). Each U.S. shareholder partner uses this data to complete Form 8992.⁷ Part VI also reports the partner’s share of qualified business asset investment (QBAI) and tested interest expense, which feed the GILTI calculation and any Section 250 deduction.

The Other Parts

The remaining parts handle more specialized situations. Part IV covers the Section 250 deduction for Foreign-Derived Intangible Income, used with Form 8993. Part V covers distributions from foreign corporations attributable to previously taxed earnings and profits. Part VII covers passive foreign investment company (PFIC) shares held through the partnership, used with Form 8621. Part VIII reports deemed-paid foreign taxes on CFC inclusions. Part IX addresses the Base Erosion and Anti-Abuse Tax for corporate partners that meet the BEAT gross receipts threshold, generally $500 million averaged over three years, and feeds Form 8991.⁸ Part X supplies foreign partners with information for income effectively connected with a U.S. trade or business. Parts XI and XII deal with Section 871(m) transactions and qualified derivatives dealer partnerships.

How Owners Use K-3 Data on Their Own Returns

The most common use is the foreign tax credit. A partner takes Part II and Part III data from the K-3 and feeds it into Form 1116, which calculates the maximum credit allowed in each basket. Without the country-by-country, basket-by-basket detail on the K-3, a partner cannot compute the credit correctly.⁶

For GILTI, the treatment splits by owner type. Corporate partners report their GILTI inclusion on Form 8992 and claim the Section 250 deduction directly. Individual partners face a higher effective rate on GILTI unless they make a Section 962 election, which lets them be taxed on CFC inclusions at corporate rates. That election opens the door to the Section 250 deduction and an indirect foreign tax credit, and it also requires additional reporting, including Form 8992 and potentially Form 8993.⁷ Without a 962 election, an individual’s GILTI inclusion flows to Schedule 1 of Form 1040 and is taxed at ordinary rates.

Any mismatch between the K-3 and the partner’s own return will show up in the IRS matching systems, so the numbers you report should tie back to the K-3 you received.

Deadlines and Electronic Filing

The K-3 furnishing deadline matches the K-1 deadline. For both partnerships and S corporations, that is generally March 15 following the close of the tax year, or September 15 on extension. An extension of time to file the entity return does not automatically extend the deadline for furnishing K-1s and K-3s to owners; a separate extension is needed if the entity needs more time to provide those statements.

The completed K-2 and K-3 are attached to the entity’s main return when filed. If the entity is required to e-file its Form 1065 or Form 1120-S, Schedules K-2 and K-3 must also be e-filed; paper filing requires an approved IRS waiver. For 2025 returns filed in 2026, partnerships filing 10 or more returns of any type during the calendar year are generally required to e-file.

Penalties for Late or Incorrect K-3s

The IRS treats Schedules K-2 and K-3 as information returns and treats the K-3 furnished to each owner as a payee statement. That means one missed or incorrect K-3 can trigger two penalties: one for the information return and one for the payee statement.⁹

For returns due in 2026 (tax year 2025), the per-return amounts depend on how quickly the entity fixes the failure:¹⁰

Corrected within 30 days of the due date: $60 per return or statement.
Corrected after 30 days but before August 1: $130 per return or statement.
Filed after August 1 or not filed at all: $340 per return or statement.
Intentional disregard: at least $680 per return or statement, with no maximum cap.

Because the two penalties apply separately, a single K-3 that is never filed or furnished can cost $680 ($340 for each failure). The same amounts apply to K-3s filed on time but containing incorrect or incomplete information, and they scale with the number of partners.

Reasonable-Cause Relief

An entity that fails to file correct or timely K-3s can request penalty abatement by showing reasonable cause. Under Section 6724, the IRS will waive the penalty if the failure was not due to willful neglect.¹¹

To qualify, the entity generally has to show two things. First, that it acted responsibly before and after the failure by requesting extensions when possible, taking steps to prevent the failure, and fixing the problem as quickly as it could. Second, that significant mitigating factors were present, such as being a first-time filer, having a strong compliance history, or facing circumstances beyond its control.¹²

Relief can be requested by phone using the number on the penalty notice, or in writing using Form 843. The IRS has historically shown some flexibility with first-time K-3 filers who made good-faith efforts to comply, but that leniency is not guaranteed as the form matures.

1
Internal Revenue Service. 2025 Shareholder’s Instructions for Schedule K-3 (Form 1120-S)
2
Internal Revenue Service. IRS Form 1065, Schedules K-2 and K-3 Filing Requirements
3
Internal Revenue Service. Partnership Instructions for Schedules K-2 and K-3 (Form 1065) – Section: Domestic Filing Exception
4
Internal Revenue Service. IRS Form 1065, Schedules K-2 and K-3 Filing Requirements – Section: U.S. Citizen/Resident Alien Partners
5
Internal Revenue Service. Partner’s Instructions for Schedule K-3 (Form 1065)
6
Internal Revenue Service. Instructions for Form 1116 – Section: Explanation of Certain Line Items on Schedule K-3
7
Internal Revenue Service. Instructions for Form 8992
8
Internal Revenue Service. Form 8991 – Tax on Base Erosion Payments of Taxpayers With Substantial Gross Receipts
9
Internal Revenue Service. Information Return Penalties
10
Internal Revenue Service. General Instructions for Certain Information Returns (2025) – Section: Penalty Amounts
11
Office of the Law Revision Counsel. 26 USC 6724 – Waiver; Definitions and Special Rules
12
Internal Revenue Service. Penalty Relief for Reasonable Cause