Editorial Standards
How we research, review, and update this guide
Every Accountably guide is researched against primary IRS sources, reviewed by a U.S. CPA, and refreshed as guidance evolves. Read our Editorial Guidelines to see how we source, fact-check, and update our content.
An S corporation pays one foreign vendor, assumes that is too small to count as international activity, and files Form 1120-S without Schedule K-2. Then a shareholder asks for Schedule K-3 in late March to finish a Form 1116, the one-month date has already passed, and the team is rebuilding foreign source income and tax detail under deadline pressure. That sequence is where most K-2 trouble starts.
Schedule K-2 attaches to the 1120-S and feeds each shareholder's K-3, and a single shareholder request can knock out the domestic filing exception you were counting on. For a calendar-year 2025 return the deadline is March 16, 2026, with an extension to September 15, 2026, and the latest one-month date for an extended filer is August 15, 2026. The hard part is not the math; it is having the data ready before someone asks.
Key Takeaways
- Schedule K‑2 extends Form 1120‑S to capture international items so your shareholders can finish their own filings with Schedule K‑3 and forms like Form 1116 and Form 8992. You attach K‑2 to the 1120‑S and furnish K‑3 to each shareholder on the same timetable as Schedule K‑1.
- The domestic filing exception for tax year 2025 can spare you from filing K‑2 and furnishing K‑3 if you meet all criteria, including limited foreign activity, timely shareholder notification, and no requests by the one‑month date.
- For a calendar‑year S corp on extension, the latest one‑month date is August 15, 2026. A request received by that date removes the exception for the requester. Requests after that date require furnishing K‑3 only to the requester, and may trigger K‑2/K‑3 filing for the next year if that person remains a shareholder.
- Penalties mirror Form 1120‑S and K‑1 rules. Failure to furnish a correct and timely K‑1 or K‑3 can draw a per‑statement penalty, and late or incomplete 1120‑S filings can trigger a per‑shareholder, per‑month penalty.
What Schedule K‑2 and K‑3 actually do
Think of Schedule K‑2 as the S corporation’s international appendix to Schedule K. It standardizes how you report foreign‑related information, such as foreign‑source income, foreign taxes paid or accrued, expense allocation, PTEP, Subpart F and GILTI items, and PFIC data. Schedule K‑3 passes a shareholder’s exact share of those items to them, so they can complete returns like Form 1116, Form 8992, or Form 8621. Attach K‑2 to Form 1120‑S by the return due date, and furnish K‑3 on the same timeline as K‑1.
For 2025 instructions, the IRS also flagged updates, including Box 13 notes for certain other international items. If you have unusual cross‑border facts, check the “What’s New” section before you finalize e‑file.
Who must file, with quick scenarios
If your S corp has any item that affects a shareholder’s U.S. tax or reporting under the international provisions, complete the relevant parts of K‑2 and furnish K‑3. If there are no foreign items, you might still need to furnish K‑3 when a shareholder requests it by the one‑month date.
Common situations
| Situation | Must file K‑2 and furnish K‑3? | What to watch |
| You have foreign‑source income | Yes | Categorize by separate basket in Part II |
| You paid or accrued foreign taxes | Yes | Report in Part III, align with Form 1116 data |
| You own a CFC or receive data from a foreign affiliate | Yes | Parts IV, V, and VII may apply |
| No foreign items on your books | Maybe | If a shareholder requests K‑3 by the one‑month date, provide what is relevant for that shareholder |
| You think you qualify for the domestic filing exception | Maybe not | You must meet all criteria, including timely notice and no requests by the one‑month date |
In short, when in doubt, check the exception rules and your shareholder communications. The timing of a request, not just your fact pattern, can change your filing outcome.
The one‑month date, explained in plain English
The one‑month date is exactly one month before the date you file Form 1120‑S. If you extend a calendar‑year 2025 return and file on or after September 15, 2026, your latest one‑month date is August 15, 2026. Any request received on or before that date requires you to complete and file the relevant parts of K‑2 with the IRS and furnish K‑3 to the requester at the same time you file the return.
If a request arrives after the one‑month date, the exception can still apply for others. You furnish K‑3 only to the late requester by the later of your 1120‑S filing date or one month from the request date. If that requester is still a shareholder next year, you must complete the relevant K‑2/K‑3 for that shareholder in that next year.
Domestic filing exception for tax year 2025
The domestic filing exception can save you time when your international footprint is tiny, but it is all or nothing. You must meet all three criteria to skip filing K‑2 and furnishing K‑3 for tax year 2025.
The three criteria you must meet
- No or limited foreign activity Your only foreign activity is passive‑category foreign income with no more than $300 of creditable foreign income taxes treated as paid or accrued, and those amounts appear on a payee statement you received, such as a 1099 from a mutual fund.
- Shareholder notification by the K‑1 furnishing date You must tell shareholders, at or before the time you furnish Schedule K‑1, that they will not receive a Schedule K‑3 unless they request it. You can include the notice with the K‑1. Maintain proof of the notice.
- No Schedule K‑3 requests by the one‑month date If any shareholder requests K‑3 on or before the one‑month date, you must complete and file the relevant K‑2 parts with the IRS and furnish K‑3 to that shareholder. If no one requests by that date, you can rely on the exception for the year, subject to the late‑request rule below.
Heads up: For calendar‑year 2025 S corps on extension, the latest one‑month date is August 15, 2026. Put it on your calendar now.
Early requests, late requests, and next‑year consequences
- Request on or before the one‑month date File only the parts of K‑2 relevant to the requester and furnish that shareholder’s K‑3 when you file the 1120‑S. You do not need to furnish K‑3 to other shareholders if they did not request it.
- Request after the one‑month date You keep the exception for others. You must still furnish K‑3 to the late requester by the later of your filing date or one month after the request. If that shareholder still owns stock next year, you must file the relevant K‑2/K‑3 for that shareholder in that next year.
- Annual request reminder Beginning with 2024, the IRS clarified that partners and shareholders should request K‑3 annually, or opt in to ongoing delivery. Build an annual reminder into your organizer.
Filing, furnishing, and recordkeeping checklist
Your practical timeline
- Decide on extension and log the one‑month date the same day.
- Send the K‑3 notice with each shareholder’s K‑1, keep proof of delivery.
- Track requests, noting the date received and who requested.
- If a timely request arrives, prepare only the relevant parts for that shareholder, attach K‑2 to the 1120‑S, and furnish K‑3 on the filing date.
- If a late request arrives, calendar the furnish‑by deadline, then set a next‑year K‑2/K‑3 task for that shareholder.
Attach K‑2 to Form 1120‑S and file by the due date, including extensions. Furnish K‑3 on the same timetable as K‑1. Keep workpapers that show sourcing, allocations, translations, and any payee statements that support the exception.
What‑How‑Wow framework applied
- What K‑2 and K‑3 move international data from the entity to each shareholder in a standard format.
- How Use a one‑page SOP that covers notice language, request intake, part selection, and final review. Your SOP should specify where to store 1099s that show foreign taxes, how to map separate baskets in Part II, and how to tie foreign taxes in Part III to Form 1116 instructions.
- Wow Run a five‑minute pre‑file audit. Confirm the one‑month date logic, verify that Part II categories match Part III taxes, and spot‑check that any PFIC or CFC items in Parts VI and V line up with shareholder‑level forms. This reduces rework and those dreaded “can you resend K‑3 with corrections” emails.
A quick word on operations
If you ever felt that K‑2/K‑3 work drags partners into late‑night review loops, you are not alone. The fix is structure. Clear SOPs, standardized workpapers, and a simple escalation path keep reviews short and clean. If you use offshore capacity, treat it like operations, not resume farming. That means layered reviews, file naming standards, deadline accountability, and continuity plans. This is exactly how Accountably supports firms that need predictable K‑2/K‑3 delivery without losing control of quality or workflow. Mentioned here once because it matters, not as a pitch.
Inside the form, Parts I through VII
Use this section as your quick tour. You do not always complete every part. Only fill the parts that match your facts.
| Part | What it covers | Typical shareholder forms |
| I | International items not reported elsewhere, plus certain statements | Varies by fact pattern |
| II | Source and separate category of income | Form 1116 for individual shareholders (Form 1118 is the corporate-level FTC form and does not apply to typical S corp shareholders, who are individuals or fiduciaries) |
| III | Expense allocation and apportionment for foreign tax credit, foreign taxes paid or accrued | Form 1116 |
| IV | PTEP and section 986(c) currency gain or loss, distributions from foreign corporations | Shareholder records for PTEP tracking |
| V | Subpart F and GILTI information | Form 8992 and Form 1040 reporting of inclusions |
| VI | PFIC information | Form 8621 |
| VII | Foreign corporation net income by group for deemed‑paid FTC | Form 1116 for individual or fiduciary S corp shareholders (Form 1118 is corporate-level FTC and does not apply to typical S corp shareholders) |
These descriptions track the IRS instructions for S corporations. If your software masks the section names, re‑label tabs so your preparers see the same language as your reviewers.
Part II and Part III, the pairing that drives most of the work
- Part II, sourcing Categorize by basket, then by source. This forms the base for the foreign tax credit limitation.
- Part III, allocation and taxes Allocate R&E and interest, then report foreign taxes paid or accrued. If you have only de minimis mutual fund foreign tax, Part III is still where the numbers sit if you are filing.
Parts IV, V, VI, and VII, when complexity shows up
- Part IV, PTEP and 986(c) Use when you have foreign corporation distributions that can be dividends or returns of PTEP.
- Part V, Subpart F and GILTI Feed your shareholders the inputs they need for Form 8992 and any 951 inclusions.
- Part VI, PFIC If shareholders have PFIC exposure, they will look for this section to complete Form 8621.
- Part VII, deemed‑paid taxes context This supports deemed‑paid foreign tax credit computations tied to Part V inclusions.
Penalties and how to avoid them
Two buckets matter here.
- Failure to furnish correct and timely K‑1 or K‑3 to a shareholder There is a per‑statement information‑return penalty if you miss the deadline or include incorrect information, and the amount is indexed for inflation each year, so confirm the current figure in the year’s instructions. Delays or errors can add up quickly in multi‑owner entities. Document reasonable cause if you run into unavoidable issues.
- Failure to file a complete and timely Form 1120‑S Late or incomplete returns can trigger a per‑shareholder, per‑month penalty for up to 12 months. For 2025 tax year returns (required to be filed in 2026), the base monthly amount is $255 per shareholder under IRC §6699, per Rev. Proc. 2024‑40. Calendar the extension, final due date, and one‑month date on day one.
Practical guardrails: keep a copy of your shareholder notification, store payee statements that support the exception, and log every K‑3 request with a timestamp. This is your penalty defense file.
People, process, and tools that cut review time
- People Assign a single reviewer for Parts II and III because those sections connect. Make Part V a specialist review when CFCs or GILTI are in play.
- Process Use a two‑page SOP, a standardized file naming system, and a one‑click index of attachments. Require a pre‑review checklist that confirms source baskets, expense allocations, and that shareholder identifiers on K‑3 match K‑1.
- Tools Map your tax software’s K‑2 screens to the IRS parts. If your stack includes QuickBooks, Xero, UltraTax, CCH Axcess, Lacerte, ProConnect, Drake, Karbon, Canopy, Suralink, or JetPack, keep screenshots of where foreign tax and sourcing entries live so new staff do not hunt. A five‑minute screencast often saves an hour in review.
Final checklist you can copy
- Confirm your return type, year, and extension status, then write down the one‑month date.
- Send K‑3 notices with K‑1s and save proof.
- Collect payee statements that show any foreign taxes, such as 1099s from funds.
- Track requests and decide which parts apply for each requester.
- Tie Part II baskets to Part III taxes, then spot‑check Parts IV through VII where relevant.
- Attach K‑2 to 1120‑S, furnish K‑3 on the K‑1 timetable, and archive your penalty defense file.
Compliance note, updated May 29, 2026: This guide summarizes IRS instructions for tax year 2025. Always confirm the latest instructions and notices on the IRS site before filing. This content is for general information, not tax advice for your specific situation.
When structure matters, not headcount
If you need extra hands to prepare or review K‑2/K‑3, add structure before you add hours. Standardized workpapers, named reviewers, and a clear escalation path eliminate back‑and‑forth. When firms ask Accountably for help, we integrate trained offshore teams into your workflow with layered reviews and file standards so partners are not stuck in review loops. Use us where it makes sense, skip us where it does not. The goal is simple, deliver accurate K‑2/K‑3 on time without chaos.
Editorial transparency: This article was drafted with the help of writing tools and was fact‑checked against current IRS instructions by our tax editors before publishing. Primary sources are cited above.
Resources
- IRS S corporation instructions for Schedules K‑2 and K‑3, including what’s new, who must file, timing, and parts overview.
- IRS summary page on 1120‑S K‑2 and K‑3 filing requirements, including annual request expectations.
- Penalty references for failure to furnish K‑1 and K‑3, and for late or incomplete Form 1120‑S filings.
Ready to stop the August scramble? Keep the one‑month date front and center, use the checklist above, and your next K‑2/K‑3 season will feel a lot lighter.
Common Mistakes We See Every Season
The pattern across S corporations preparing Schedule K-2 is rarely a single bad call – it is small documentation gaps that compound across Parts I through VII and surface only when a shareholder needs the K-3 to finish their personal return. Here are the recurring ones we see every season.
Reusable Checklists
These checklists are copy-paste ready for a firm SOP or workpaper template. Each one targets a discrete decision point on Schedule K-2 where small process gaps create rework downstream.
Domestic filing exception scan
- Confirm no foreign activity in the tax year (no foreign branches, foreign source income, foreign taxes paid or accrued, or foreign assets).
- Verify all direct shareholders are eligible U.S. persons under the K-2 instructions.
- Send written shareholder notice by the K-3 notification date stating Schedule K-3 will not be issued unless requested.
- Track shareholder responses against the one-month date before filing Form 1120-S.
- If any shareholder requests K-3, prepare full Schedule K-2 and furnish K-3 to that shareholder by the Form 1120-S filing date.
- Document the exception evaluation and shareholder notices in the engagement file.
Parts I-VII applicability sweep
- Mark Yes or No on box A for each of the seven Parts before any preparer signs off.
- For each Part marked Yes, confirm the Part is complete, attached, and tied to supporting workpapers.
- Cross-check Part I numbered boxes against the required attached statements (especially box 13 'Other international items', which needs both a description and a statement).
- Confirm reserved-for-future-use lines (Part II Section 1 lines 5, 9, 22, 23; Part II Section 2 lines 51-53; Part I box 12; Part III Section 2 line 2; Part III Section 3 lines 4-6) are left blank.
- If filing a corrected K-2 after the original submission, check box B 'Amended K-2' on the top of the schedule.
Schedule K-3 shareholder handoff
- Identify each shareholder with an item of international relevance (foreign source income, foreign taxes, CFC or PFIC ownership, GILTI inclusion).
- Prepare Schedule K-3 for each affected shareholder with the relevant Parts populated from K-2.
- Translate Part IV distributions at the spot rate on the date of distribution, not an annual average.
- Keep Part VII columns (ii) and (iii) in the foreign corporation's functional currency; report only column (iv) (foreign taxes for which credit allowed) in U.S. dollars.
- Furnish K-3 to each shareholder by the Form 1120-S filing date, including the extended September 15, 2026 date if Form 7004 was filed.
- Provide a brief preparer note on the K-2 to K-3 to Form 1116 flow so the shareholder's preparer can pick up cleanly.
Keep Schedule K-2 (Form 1120-S) Season From Stalling
Schedule K-2 has a peculiar pressure profile: the work concentrates in March for calendar-year S corporations, the data spans seven Parts and pulls from CFC ledgers, foreign tax detail, PFIC distribution history, and currency translation logs. A single late or incorrect K-3 to a shareholder stalls that shareholder's personal Form 1040 and Form 1116. The per-shareholder, per-month penalty under IRC §6699 reached $255 for returns required to be filed in 2026 per Rev. Proc. 2024-40, and the electronic-filing threshold that took effect January 1, 2024 requires corporations filing 10 or more returns in a calendar year to file Form 1120-S (with K-2 attached) electronically, per the Instructions for Form 1120-S.
The fix is upstream discipline. K-2 review time collapses when foreign source data, spot rates, CFC tags, and PFIC lookback windows are captured during the year rather than reconstructed at filing.
- Tag each general ledger account with a foreign tax credit category (U.S. source, foreign branch, passive, general, other) during the year so Part II Section 1 lines 1-23 and Section 2 lines 25-53 reconcile in one pass.
- Maintain a CFC and PFIC inventory with EIN or reference ID, ownership percentage under IRC §957, and the §1297(a) PFIC test result so Part V rows A-K and Part VI rows A-L populate from a single source.
- Log every foreign distribution on the date received with the spot rate and functional currency, ready for Part IV columns (e), (g), and (h).
- Track foreign taxes paid versus accrued by jurisdiction so the Part III Section 3 line 1 election is documented and the year-binding paid-or-accrued choice does not become a surprise at review.
- Build a shareholder communication log capturing the K-3 notification date letter, any K-3 requests received, and the one-month date status so the domestic filing exception decision is auditable.
This is the operating discipline behind our U.S. tax outsourcing services: structured workpapers, multi-layer review, and documented turnaround SLAs so K-2 and K-3 packages clear review without consuming senior reviewer time.
FAQs
What is Schedule K‑2 for an S corporation?
It is the extension of Schedule K that reports international tax items at the entity level so each shareholder can finish their own reporting with Schedule K‑3 and related forms. You attach K‑2 to Form 1120‑S and furnish K‑3 to shareholders on the K‑1 timetable.
Do S corps always file K‑2 and furnish K‑3?
You must complete the parts that match your facts when you have international items, such as foreign‑source income, foreign taxes, CFC or PFIC information. The domestic filing exception lets you skip K‑2/K‑3 for tax year 2025 if you meet all criteria and no shareholder requests K‑3 by the one‑month date.
What is the one‑month date in practice?
It is one month before the date you file the 1120‑S. For a calendar‑year 2025 S corp on extension, the latest one‑month date is August 15, 2026. A request received on or before that date requires you to file the relevant parts and furnish K‑3 to the requester with your 1120‑S.
What if a shareholder asks for K‑3 after the one‑month date?
You can still use the exception for others. You must furnish K‑3 only to the late requester by the later of the filing date or one month after the request, and you may need to include K‑2/K‑3 for that shareholder next year if they remain a shareholder.
Are there any recent instruction changes I should know?
Yes. The 2025 S corporation instructions confirm the domestic filing exception framework and include updates such as Box 13 notes in Part I. Always check the IRS instructions page before you e‑file, then update your workpapers.