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Form 1120-FSC: U.S. Income Tax Return of a Foreign Sales Corporation
IRS Form 1120-FSC is used to report income, gains, losses, deductions, and credits, determining the income tax liability for a Foreign Sales Corporation (FSC). Failure to file may result in a penalty of 5% of unpaid tax for each month or part of a month the return is late.
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IRS Form 1120-FSC - U.S. Income Tax Return of a Foreign Sales Corporation
IRS Form 1120-FSC is used to report income, gains, losses, deductions, and credits, determining the income tax liability for a Foreign Sales Corporation (FSC). Failure to file may result in a penalty of 5% of unpaid tax for each month or part of a month the return is late.
Risk Radar
Scan points- 1Ensure that any required payment for Form 1120-FSC is made electronically no later than the due date (excluding extensions).
- 2Using a revision of Form 1120-FSC or Schedule P that is not the current edition (Dec 2025/Sept 2017).
- 3Paying tax late, even if an automatic extension for filing was granted.
- 4Omitting to enter the total NOL generated in prior years on Line 7 of Form 1120-FSC.
- 5Failing to make any payment electronically as required by the IRS.
Plain English
This form helps a Foreign Sales Corporation calculate its annual U.S. federal income taxes. It requires reporting all business activity, including profits and losses generated overseas that affect U.S. tax liability. The filing process ensures the corporation pays any required taxes to the IRS by the deadline.
Submission Date
- Filing date: 2026-02-12 08:10:39
- 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 reporting income, gains, losses, deductions, and credits, and determining the income tax liability for a Foreign Sales Corporation (FSC).
- Do not use it when filing an extension; file Form 7004, Application for Automatic Extension of Time To File Certain Business Income Tax, Information, and Other Returns.
- Check Form 8822-B instead when notifying the IRS of a change of address or responsible party after the return has been filed.
Form selector
Use this form or another form?
Need to request an extension for filing
Use this form by the original due date to ask for extra time to file the tax return
✓ Check instructions for Form 7004.
Overpaid estimated tax and need a refund
File this form if you believe you overpaid estimated tax, allowing you to apply for a quick refund
✓ Verify eligibility on IRS.gov.
Changing address or responsible party after filing
Use this specific form only when notifying the IRS of changes that happen after the return has been submitted
✓ Check instructions for Form 8822-B.
Deadline or filing window
The FSC must pay any tax due in full no later than the due date for filing Form 1120-FSC, which excludes extensions. To request an extension of time to file, the FSC must submit Form 7004 by the original return due date.
Checklist
What you need before filling it out
Principal shareholder information
The individual, corporation, partnership, trust, or estate that was the principal shareholder at the beginning of the FSC's tax year · Lines 1a through 1h
Address change notification
Check the box labeled “Address change” · Instructions p.9
Estimated tax penalty calculation
Form 2220, Underpayment of Estimated Tax by Corporations · Page 1, line 3
Foreign address format
City or town, state or province, country, and foreign postal code · Instructions p.9
Payment for US-based FSCs
Electronic funds transfer via EFTPS · Instructions p.7
Before you submit
- 1Complete lines 1a through 1h with the principal shareholder's details.
- 2Determine if an address change occurred since the last filing and check the appropriate box.
- 3Use Form 2220, Underpayment of Estimated Tax by Corporations, to calculate any estimated tax penalty amount.
- 4Enter the calculated estimate tax penalty on Form 1120-FSC, page 1, line 3.
- 5If paying by check or money order, ensure it is payable to “United States Treasury” and includes the FSC's EIN, “Form 1120-FSC,” and the tax period.
- 6Sign and date the return.
- 7Enclose the payment when filing Form 1120-FSC.
How to file this form
- 1Determine if an extension is needed; if so, file Form 7004 by the original due date specified earlier.
- 2Calculate the estimated tax penalty using Form 2220 and enter that amount on Form 1120-FSC, page 1, line 3.
- 3Complete all required sections, including principal shareholder information and checking any applicable address or amended return boxes.
- 4Submit the completed Form 1120-FSC and payment to the Internal Revenue Service Center P.O. Box 4091, Ogden, UT 84409, and keep a copy of the submission.
Known limitations
- 1A FSC that elects to be treated as a domestic corporation under section 943(e)(1) files Form 1120 instead of Form 1120-FSC.
- 2Small business taxpayers, for tax years beginning in 2025, qualify if they have average annual gross receipts of $31 million or less for the 3 prior tax years and are not a tax shelter as defined in section 448(d)(3).
- 3For subsequent tax years, small business taxpayer status uses the section 448(c) gross receipts test amount found at IRS.gov/ InflationAdjustment.
- 4A corporation engaged in farming must use an accrual method for sales and purchases of inventory items.
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 of Form 1120-FSC is dated December 2025. For the latest information, users should check IRS.gov/Form1120FSC. The instructions note that for tax returns required in 2026, the minimum penalty for failure to file a return more than 60 days late has increased to the smaller of the tax due or $525.
What changed or needs a fresh check
- Edition date — confirm the revision date reads December 2025.
- Filing location — use Internal Revenue Service Center P.O. Box 4091, Ogden, UT 84409 for mailing the Form 1120-FSC.
- Signature — the return must be signed and dated by the filer.
- Payment method details — payment checks or money orders must be payable to “United States Treasury.”
Quick Facts
Downloads
After you file
- 1If the FSC is filing an amended return for a loss year without having made the election, the election can be made within 6 months of the due date of the loss year return (excluding extensions). The filer must attach the election and write "Filed pursuant to section 301.9100-2" on the election statement.
- 2If a penalty notice is received after filing Form 1120-FSC, the FSC must send an explanation to the IRS at that time for determination of whether reasonable cause criteria are met.
- 3The payment of any tax due must be made in full no later than the due date for filing Form 1120-FSC (not including extensions).
- 4For FSCs without an office or place of business in the United States, tax can be paid using the Electronic Federal Tax Payment System (EFTPS) if a U.S. bank account is available; otherwise, payment must be arranged through a financial institution or qualified intermediary.
Sources
- SRCInstructions p.1 — For future developments related to Form 1120-FSC, go to IRS.gov/Form1120FSC.
- SRCInstructions p.1 — The purpose of Form 1120-FSC is to report income, gains, losses, deductions, and credits, determining the income tax liability for a FSC.
- SRCInstructions p.4 — A FSC must file Form 1120-FSC if it elected to be treated as a FSC or small FSC, and the election is still in effect.
- SRCInstructions p.5 — To request an extension of time to file, a FSC must file Form 7004 by the return due date specified earlier.
- SRCInstructions p.6 — Unless it is a small business taxpayer, a FSC must use an accrual method for sales and purchases of inventory items.
- SRCInstructions p.6 — For tax years beginning in 2025, an FSC qualifies as a small business taxpayer if (a) it has average annual gross receipts of $31 million or less for the 3 prior tax years, and (b) it is not a tax shelter as defined in section 448(d)(3).
Common confusion points
Does an FSC always file Form 1120-FSC?
The source notes that an FSC electing to be treated as a domestic corporation under section 943(e)(1) does not file Form 1120-FSC.
→ Verify if the FSC elected to be treated as a domestic corporation; if so, it files Form 1120.
Are all foreign receipts counted as 'Foreign Trading Gross Receipts'?
The source defines specific types of income and property that are excluded from this calculation.
→ Confirm that the receipts do not include investment income, carrying charges, or certain excluded receipts defined in section 924(f).
How is the Net Operating Loss (NOL) carryover amount entered?
The instructions specify how to calculate the total NOLs and what amounts must be specifically excluded from the calculation.
→ Enter the total of all NOLs generated in prior years, even if some loss was used on this return; do not reduce the amount by any NOL deduction reported on line 19a, Part II, of Schedule B.
What is the minimum penalty for filing a tax return late?
The source provides a specific calculation based on time elapsed and tax due.
→ For returns required in 2026 that are more than 60 days late, the minimum penalty is the smaller of the tax due or $525.
Where must backup withholding amounts be reported?
The instructions differentiate between which lines require backup withholding information versus general withholdings.
→ Include the amount withheld from any payments received due to backup withholding in the total for line 2h, but do not include it on line 2g; only Chapter 3 or 4 of the Code withholdings go on line 2g.
How must an FSC pay its tax if it has no physical presence in the U.S.?
The source details multiple alternative payment methods for non-U.S. based FSCs.
→ If lacking a U.S. office, the FSC can use EFTPS with a U.S. bank account, or arrange for a financial institution to initiate a same-day payment or deposit via a qualified intermediary.
Workflow map
Related forms and next steps
Before
Current
After
Often used with
⚠ If something goes wrong
- Form 3115 — This form is used to make elections regarding changes in accounting methods, including automatic consent to change certain methods of accounting.
Questions about IRS Form 1120-FSC
What is IRS Form 1120-FSC used for?
This form helps a Foreign Sales Corporation calculate its annual U.S. federal income taxes. It requires reporting all business activity, including profits and losses generated overseas that affect U.S. tax liability. The filing process ensures the corporation pays any required taxes to the IRS by the deadline.
Who must file IRS Form 1120-FSC?
The FSC must file Form 1120-FSC and sign/date the return.
What information does IRS Form 1120-FSC require?
The form collects details regarding income, gains, losses, deductions, and credits. Specific sections include Line 7 for entering Net operating loss (NOL) carryover from prior years, and Lines 6a or 6b detailing any overpayment or refund amount.
When is IRS Form 1120-FSC due?
Tax payments must be made no later than the due date for filing Form 1120-FSC; this payment deadline does not include extensions. To request an extension of time to file, an FSC must file Form 7004 by the return due date specified earlier.
Where do I file IRS Form 1120-FSC?
The form is filed with the Internal Revenue Service Center P.O. Box 40910 | Ogden, UT 84409.
How do I complete IRS Form 1120-FSC?
The FSC must pay any tax due in full no later than the due date for filing Form 1120-FSC. Payment of the tax due must be made electronically, using methods detailed by IRS.gov/Payments. If an overpayment exists, the amount wanted refunded is entered on Line 6b; alternatively, all or part of the overpayment can be credited to next year’s estimated tax by completing line 6a.
What happens if IRS Form 1120-FSC is filed incorrectly?
Failure to file its tax return by the due date, including extensions, may incur a penalty of 5% of the unpaid tax for each month or part of a month that the return is late, up to a maximum of 25% of the unpaid tax. Interest is also charged on taxes paid late.
Does an FSC always file Form 1120-FSC?
The source notes that an FSC electing to be treated as a domestic corporation under section 943(e)(1) does not file Form 1120-FSC. Verify if the FSC elected to be treated as a domestic corporation; if so, it files Form 1120.
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