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Official form guide
Form 1120SK3: 1120-S (Schedule K-3)
Form 1120‑S Schedule K‑3 reports a corporation’s international items of income, deductions, credits, and other information required by partners or shareholders. It is attached to the corporation’s Form 1120‑S when the corporation has foreign activities that affect Schedule K‑1 recipients.
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IRS Form 1120SK3 - 1120-S (Schedule K-3)
Form 1120‑S Schedule K‑3 reports a corporation’s international items of income, deductions, credits, and other information required by partners or shareholders. It is attached to the corporation’s Form 1120‑S when the corporation has foreign activities that affect Schedule K‑1 recipients.
Risk Radar
Scan points- 1A single misplaced foreign tax credit can invalidate every shareholder’s credit claim.
- 2Missing foreign tax credit amounts
- 3Mismatched totals between Schedule K‑3 and shareholder K‑1s
- 4Using the wrong tax year on the schedule
- 5Omitting foreign source deductions
Plain English
If your S‑corp does business abroad or holds foreign assets, you must fill out Schedule K‑3 to tell the IRS and the shareholders what foreign income, taxes, and credits exist. The schedule travels with the S‑corp return and feeds the information onto each shareholder’s Schedule K‑1.
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 when the S‑corp has any foreign income, deductions, or tax credits.
- Do not use if the corporation only has domestic items; Schedule K‑1 alone is sufficient.
- Check Form 1120‑S Instructions if you are unsure whether foreign items exist.
Form selector
Use this form or another form?
No foreign activity
No Schedule K‑3 required
✓ Verify foreign activity first
Foreign partnership income
Partnership, not corporation
✓ Confirm entity type
Foreign corporation owned
Reporting ownership of foreign corporation
✓ Determine filing requirement before K‑3
Deadline or filing window
Schedule K‑3 must be filed with the corporation’s Form 1120‑S by the original due date (generally March 15 for calendar‑year filers) or any approved extension date. Extensions apply to the whole return, not just the schedule.
- —Foreign taxes paid | Sum of all foreign tax payments | Total foreign tax paid | Verify that payments are for the same tax year
Checklist
What you need before filling it out
Foreign gross receipts
Bank statements, foreign sales invoices · Revenue ledger
Foreign taxes paid
Tax payment receipts, foreign tax returns · Accounting records
Currency conversion
Daily Treasury rate tables · IRS Publication 514
Foreign tax credit limitation
Form 1118 data · Credit limitation worksheet
Shareholder allocation
Shareholder agreement, stock ledger · Schedule K‑1 worksheets
Before you submit
- 1Confirm corporation’s EIN matches the 1120‑S header
- 2Verify edition date of Schedule K‑3
- 3Reconcile totals between Schedule K‑3 and each Schedule K‑1
- 4Check all foreign tax amounts are in U.S. dollars
- 5Ensure correct tax year is entered on every page
- 6Attach Schedule K‑3 to the front of the 1120‑S packet
- 7Sign and date the Form 1120‑S signature block
- 8If filing electronically, confirm successful upload receipt
- 9If mailing, use certified mail and keep tracking number
- 10Retain supporting foreign tax documents for at least three years
How to file this form
- 1Gather all foreign‑related financial data for the tax year.
- 2Complete Schedule K‑3 tables using the IRS instructions.
- 3Transfer the per‑shareholder totals to each Schedule K‑1.
- 4Review the 1120‑S for consistency and attach Schedule K‑3.
- 5Sign the return and choose paper or electronic filing.
- 6Mail to the correct IRS service center or submit via e‑file.
- 7Keep a copy of the entire return and all supporting documents.
Known limitations
- 1IRS instructions may not cover every type of foreign credit; consult the specific credit regulations.
- 2Currency conversion rates must follow Treasury guidelines; the form does not provide rates.
- 3The schedule does not calculate foreign tax credit limitation automatically.
- 4Electronic filing requires an approved software provider; not all providers support Schedule K‑3.
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.
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Fillable formOpen in Editor->The IRS provides the latest Schedule K‑3 as part of the 2024 Form 1120‑S package. Verify that you are using the edition dated January 2024 or later.
What changed or needs a fresh check
- Edition date: use the version dated January 2024 or later
- Fee: no separate filing fee for Schedule K‑3
- Mailing address: send to the IRS Service Center for S‑corporations (address in 1120‑S instructions)
- Electronic filing: upload through approved IRS e‑file provider
- Signature: corporation officer must sign the attached Form 1120‑S
Quick Facts
Downloads
After you file
- 1Store a complete PDF of the filed return and Schedule K‑3.
- 2File all foreign tax receipts, foreign partnership statements, and conversion rate tables.
- 3Monitor IRS acknowledgments for acceptance or error notices.
- 4Inform shareholders that their K‑1 includes foreign items for their personal returns.
- 5Track any extension approvals and note the new filing deadline.
- 6Prepare for possible audit by organizing foreign documentation.
- 7Update the corporation’s foreign activity ledger for the next year.
Sources
- SRCIRS Form 1120‑S InstructionsSchedule K‑3 section
- SRCIRS Publication 542Corporations
- SRCIRS Publication 514Foreign Tax Credit
- SRCIRS e‑file Provider Listconfirms electronic submission
- SRCIRS Service Center address list for S‑corporations
- SRCNot clearly stated in the provided official source
Common confusion points
Foreign vs. domestic income
Income source rules differ by treaty
→ Verify source country for each receipt
Accrual vs. cash reporting
Schedule K‑3 follows the corporation’s method
→ Confirm method matches the 1120‑S
Currency conversion timing
Some taxpayers use average rate, others use spot rate
→ Use the method specified in the instructions
Allocation to shareholders
Percentages must match stock ownership
→ Re‑check the stock ledger
When to file Schedule K‑3
Some think it’s optional for small amounts
→ File whenever any foreign item exists
Workflow map
Related forms and next steps
Before
Current
After
Often used with
⚠ If something goes wrong
- Form 1120‑S Amendment – to correct Schedule K‑3 errors
Source transparency
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