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Form 1120SK3: 1120-S (Schedule K-3)
IRS Form 1120-S (Schedule K-3) is used by S corporations to report shareholders' shares of international tax items, including foreign source income and foreign taxes, for computing the foreign tax credit on Form 1116 or Form 1118. It provides details on gross income by country, expenses, and apportionment factors. Shareholders need this information to avoid double taxation.
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IRS Form 1120SK3 - 1120-S (Schedule K-3)
IRS Form 1120-S (Schedule K-3) is used by S corporations to report shareholders' shares of international tax items, including foreign source income and foreign taxes, for computing the foreign tax credit on Form 1116 or Form 1118. It provides details on gross income by country, expenses, and apportionment factors. Shareholders need this information to avoid double taxation.
Risk Radar
Scan points- 1Claiming a deduction for amounts disallowed under section 267A reported on lines 41-43.
- 2Reporting gross income without the correct country code from IRS.gov/CountryCodes.
- 3Failing to attach the statement for box 6 if section 267A applies.
- 4Reporting creditable foreign taxes as deductible on line 45 instead of in Part III.
- 5Not allocating interest expense properly between U.S. and foreign source income.
Plain English
This schedule helps S corporation shareholders figure out how much foreign tax credit they can claim on their U.S. tax return. It breaks down the corporation's income from different countries and the foreign taxes paid. Shareholders use this information to avoid paying tax twice on the same income.
Submission Date
- Filing date: 2026-01-12 17:10:48
- Preparation window: collect IDs, supporting records, and signatures in advance.
- Final review: verify names, dates, and required fields before submission.
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What this form is for
- Use this form when you are a shareholder of an S corporation and need to report your share of foreign source income, deductions, credits, and other international tax items to compute the foreign tax credit.
- Do not use it when you are not a shareholder of an S corporation or when the S corporation has no foreign source income, deductions, or credits requiring detailed reporting.
- Check Form 1116 or Form 1118 instead when you need to compute and claim the foreign tax credit using the information from Schedule K-3.
Form selector
Use this form or another form?
Individual shareholder claiming foreign tax credit
Required to compute and claim the foreign tax credit on an individual income tax return
✓ Confirm you have Schedule K-3 Part III for creditable foreign taxes
Corporate shareholder claiming foreign tax credit
Corporations use Form 1118 instead of Form 1116 for the foreign tax credit
✓ Verify the shareholder is a corporation, not an individual
Shareholder making PFIC elections
Needed to report elections for PFIC, QEF, or MTM status
✓ Check Schedule K-3 Part VI for PFIC details and columns (k)-(n)
Shareholder deducting foreign taxes not creditable
Foreign taxes reported on line 45 are deductible but not creditable; claim on Schedule A if itemizing
✓ Ensure the taxes are not creditable per line 45 instructions
Deadline or filing window
Not stated in the official source
Checklist
What you need before filling it out
Part II, Section 2, lines 41-43
Section 267A disallowed deduction statement · Attached to Form 1120-S (box 6 checked)
Part III, Section 3 – Creditable foreign taxes
Foreign tax credit information (country, taxes paid) · Schedule K-3, Part III, Section 3
Part II, Column (a) – U.S. source income
Treaty election documentation · Schedule K-3, Part II
Part VI – PFIC information
PFIC annual information statement or QEF election details · Schedule K-3, Part VI
Line 45 – Foreign taxes deductible, not creditable
List of foreign taxes that are not creditable · Instructions for Form 1116
Part III, Section 1 – R&E expense apportionment factors
R&E expense allocation factors · Schedule K-3, Part III, Section 1
Part VI, Column (g) – PFIC acquisition dates
Dates of PFIC stock acquisition by S corporation · Schedule K-3, Part VI, Section 1
Before you submit
- 1Confirm that the S corporation provided Schedule K-3 for the correct tax year (2025).
- 2Verify that all foreign source income is reported by country in Part II, line 24 combined correctly.
- 3Check that Box 4 is checked if a foreign tax translation statement is attached; if so, obtain the statement.
- 4Ensure that R&E expense apportionment factors from Part III, Section 1 are included and added to your own R&E.
- 5Confirm that interest expense apportionment factors from Part III, Section 2 are included and used correctly.
- 6Review that foreign taxes reported on line 45 are not claimed as a credit but deducted if eligible.
- 7Verify that you have the shareholder's copy of Schedule K-3 and the accompanying instructions.
- 8Check that you have the instructions for Form 1116 or Form 1118 to compute the foreign tax credit limitation.
- 9If making a section 962 election, ensure Form 1118 is prepared and attached.
- 10If you are an accrual method taxpayer, confirm that foreign taxes claimed as credit have been paid (see section 905(c)(2)).
- 11Keep a copy of Schedule K-3 with your tax records for future reference.
- 12Review the 'Future Developments' page at IRS.gov/Form1120S for any updates after publication.
How to file this form
- 1Obtain Schedule K-3 from the S corporation for the tax year beginning in 2025.
- 2Review Part II to identify foreign source income by country and any U.S. source income subject to treaty election.
- 3Use Part III, Section 1 to allocate and apportion R&E expenses for foreign tax credit limitation.
- 4Use Part III, Section 2 to allocate and apportion interest expense for foreign tax credit limitation.
- 5Compute the foreign tax credit using Form 1116 (or Form 1118 if applicable) with the data from Schedule K-3.
- 6Attach any required statements, such as the foreign tax translation statement if box 4 was checked.
- 7File your individual or corporate tax return (e.g., Form 1040 or Form 1120) with the computed foreign tax credit.
- 8Retain a copy of Schedule K-3 and all supporting documents for your records.
Known limitations
- 1Schedule K-3 is not required if the S corporation has no foreign source income, deductions, or credits; the shareholder may only receive Schedule K-1.
- 2Exceptions apply for RICs and income subject to section 863(b) – gross income by country reporting may not be required.
- 3Shareholders may need additional gross income data not provided in Part III for allocating expenses other than those described in Regulations section 1.861-8(e)(9).
- 4Foreign taxes that are creditable are not reported as expenses in Part II; they are reported in Part III, Section 3.
- 5Accrual method taxpayers generally cannot claim a credit for additional foreign taxes reported on line 3 unless those taxes have been paid (section 905(c)(2)).
- 6The provisional foreign tax credit election requires filing Form 7204; Schedule K-3 alone does not cover this election.
Field map
Compact field-by-field guide
Entity Info
2 items
Full legal name of the corporation and its Employer Identification Number.
Current mailing address and date of incorporation.
Income
3 items
Total revenue from business operations before deducting costs.
Direct costs attributable to producing goods sold by the corporation.
Gross receipts minus cost of goods sold and returns/allowances.
Deductions
1 items
Sum of all business expenses including compensation, rent, interest, taxes, and depreciation.
Tax
2 items
Total income minus total deductions.
Tax calculated on taxable income using the applicable corporate tax rate, minus any credits.
Signatures
1 items
An authorized corporate officer must sign and date the return.
Almost done reviewing the fields?
Fillable formOpen in Editor->The current edition is for tax years beginning in 2025 (revision date 20/25). The instructions point to IRS.gov/Form1120S for the latest information on developments after publication. No specific changes are noted in the provided source.
What changed or needs a fresh check
- Edition date — confirm the revision date reads 20/25 (tax year beginning 2025).
- Fee — Not stated in the official source — verify on the agency site.
- Mailing address — Not stated in the official source — verify on the agency site.
- Signature — Not stated in the official source (the shareholder does not sign Schedule K-3; the S corporation signs Form 1120-S).
- Attachments — If the S corporation checked box 4, confirm a foreign tax translation statement is attached as described in Part III, Section 3 instructions.
- Foreign tax translation — If box 4 is checked, verify the statement is included with the S corporation's return.
Quick Facts
Downloads
After you file
- 1Retain a copy of Schedule K-3 and your filed tax return for at least three years.
- 2Keep records of foreign taxes paid or accrued, including supporting documents from the S corporation.
- 3If you filed Form 1116, retain the country-by-country breakdown and any treaty election statements.
- 4Monitor for IRS notices regarding the foreign tax credit; respond promptly if contacted.
- 5If you made a provisional foreign tax credit election, ensure Form 7204 was filed and keep a copy.
- 6Correct any errors by filing an amended return (e.g., Form 1040-X or Form 1120-X) as soon as possible.
- 7Check IRS.gov/Form1120S periodically for updates that may affect your filing.
Sources
- SRCInstructions p.1Form title and tax year beginning 2025.
- SRCInstructions p.1Future developments link to IRS.gov/Form1120S.
- SRCInstructions p.2Box 4 foreign tax translation statement requirement.
- SRCInstructions p.3Foreign tax credit limitation and use of Form 1116 or Form 1118.
- SRCInstructions p.5Exceptions for RICs and section 863(b) income from country-by-country reporting.
- SRCInstructions p.5Line 24 combines total income by country.
- SRCInstructions p.7Line 45 foreign taxes deductible but not creditable.
- SRCInstructions p.7R&E expense apportionment factors in Part III, Section 1.
- SRCInstructions p.8Form 7204 for provisional foreign tax credit election.
- SRCInstructions p.8Accrual method taxpayers and payment requirement for credit.
Common confusion points
Do I need Schedule K-3 if I have no foreign taxes?
Shareholders may think it's unnecessary, but they might need gross income for expense allocation
→ Check if the S corporation has foreign source gross income or R&E expenses; if so, you likely need the schedule
Can I report creditable foreign taxes on line 45 as a deduction?
Line 45 is for taxes that are not creditable, but creditable taxes belong in Part III
→ Verify the foreign taxes are creditable; if creditable, use Part III, not line 45
What if the S corporation checked box 6?
Box 6 indicates a section 267A disallowed deduction, which affects your deduction
→ Obtain the attached statement and disallow those amounts on your tax return
Do I need to enter U.S. source income from Part II on Form 1116?
Only if you elect to re-source under a treaty; otherwise, do not report it
→ Do not report U.S. source income on Form 1116 unless you make a valid treaty election
How do I handle PFIC information from Part VI?
Shareholders may not know when to use Form 8621
→ Review Part VI columns; if you intend to make an election (e.g., QEF, MTM), use Form 8621; otherwise you may ignore
What is the difference between columns (k)-(n) in Part VI?
These columns assist with PFIC elections but are only relevant for certain PFICs
→ Check the instructions: column (k) is for section 1291 funds; (l) for disposition dates; (m)-(o) for gain/loss
Do I need to report R&E expense apportionment factors?
Shareholders may not realize they must allocate R&E expenses for foreign tax credit limitation
→ Use Part III Section 1 to apportion R&E expenses correctly; failure may lead to incorrect limitation
Can I use the S corporation's holding period for PFIC stock?
The shareholder's holding period may differ from the S corporation's
→ Check column (g) for S corp acquisition date; your holding period starts when you acquired the S corp stock
Workflow map
Related forms and next steps
Before
Current
After
Often used with
⚠ If something goes wrong
- Form 1040-X – amended individual return to correct errors.
- Form 1120-X – amended corporate return.
Questions about IRS Form 1120SK3
What is IRS Form 1120SK3 used for?
This schedule helps S corporation shareholders figure out how much foreign tax credit they can claim on their U.S. tax return. It breaks down the corporation's income from different countries and the foreign taxes paid. Shareholders use this information to avoid paying tax twice on the same income.
Who must file IRS Form 1120SK3?
S corporations that have international tax items, foreign shareholders, or shareholders claiming a foreign tax credit must file Schedule K-3 with their Form 1120-S.
What information does IRS Form 1120SK3 require?
Schedule K-3 collects the shareholder's share of the S corporation's foreign source income, deductions, and foreign taxes, broken down by country and separate category. It includes Part I for general international items, Part II for foreign tax credit limitation details (lines 1-24 for gross income, lines 41-43 for interest expense, line 45 for deductible foreign taxes), and Part III for apportionment factors like R&E and interest expenses.
How do I complete IRS Form 1120SK3?
The S corporation must complete Part I to report any international tax items not reported elsewhere. Part II requires reporting gross income by source and separate category, using two-letter country codes from IRS.gov/CountryCodes. Part III includes apportionment factors for R&E and interest expenses. The form must be signed by the S corporation's officer.
What happens if IRS Form 1120SK3 is filed incorrectly?
Failure to follow the instructions, such as claiming a deduction for amounts disallowed under section 267A reported on lines 41-43, may result in the IRS disallowing the deduction and assessing additional tax.
Do I need Schedule K-3 if I have no foreign taxes?
Shareholders may think it's unnecessary, but they might need gross income for expense allocation Check if the S corporation has foreign source gross income or R&E expenses; if so, you likely need the schedule
Can I report creditable foreign taxes on line 45 as a deduction?
Line 45 is for taxes that are not creditable, but creditable taxes belong in Part III Verify the foreign taxes are creditable; if creditable, use Part III, not line 45
What if the S corporation checked box 6?
Box 6 indicates a section 267A disallowed deduction, which affects your deduction Obtain the attached statement and disallow those amounts on your tax return
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