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Form 1120FM3: 1120-F (Schedule M-3)
IRS Form 1120-F Schedule M-3 is a reconciliation schedule required for foreign corporations filing Form 1120-F with total assets of $10 million or more at year-end. It replaces Schedule M-1 and must be attached to the corporation’s income tax return.
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IRS Form 1120FM3 - 1120-F (Schedule M-3)
IRS Form 1120-F Schedule M-3 is a reconciliation schedule required for foreign corporations filing Form 1120-F with total assets of $10 million or more at year-end. It replaces Schedule M-1 and must be attached to the corporation’s income tax return.
Risk Radar
Scan points- 1Failing to check the box on Form 1120-F page 1 indicating Schedule M-3 is attached.
- 2Not checking the box on Form 1120-F page 1 indicating Schedule M-3 is attached.
- 3Omitting detailed descriptions for adjustments reported in columns (b), (c), and (d).
- 4Reporting cost of goods sold items on line 2 that belong on Part II, line 12.
- 5Failing to attach a supporting statement for each item included on line 2 of Part III.
Plain English
This schedule is used by large foreign corporations to explain the difference between the income they report on their financial books and the income they report on their tax return. It helps the IRS check that the numbers match up correctly. You attach it to your main tax form (Form 1120-F).
Submission Date
- Filing date: 2026-01-08 09:10:38
- 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 a foreign corporation is required to file Form 1120-F and reports total assets of $10 million or more on Schedule L, line 17, column (d) at the end of the tax year; it replaces Schedule M-1.
- Do not use it when the foreign corporation’s total assets are less than $10 million and it does not voluntarily choose to file Schedule M-3.
- Check Schedule M-1 (Form 1120-F) instead when assets are under $10 million and you are not voluntarily filing Schedule M-3.
Form selector
Use this form or another form?
Filer has assets under $10 million and does not voluntarily file M-3
Required for reconciliation of book income to tax return income
✓ Confirm asset threshold on Schedule L line 17 col (d)
Filer needs to report retained earnings
Must be completed even if M-3 is filed; analyzes unappropriated retained earnings
✓ Attach M-2 to Form 1120-F
Filer is a bank allocating interest expense
Special rules for interest expense allocation on M-3 Part III line 26
✓ Review instructions for line 26 and bank-specific rules
Filer uses a treaty provision to attribute business profits to a U.S. permanent establishment
Affects answer to Part I question A and subsequent reporting
✓ Check treaty article and instructions for question A
Deadline or filing window
Schedule M-3 must be attached to the foreign corporation's Form 1120-F income tax return. The due date of Form 1120-F is not stated in the provided source. Extensions are not mentioned.
Checklist
What you need before filling it out
Part I, line 11
Adjusted financial net income (loss) of non-consolidated foreign corporation · Part II, line 28 col (a) or Schedule M-1, line 1
Part I, question B
Non-consolidated, worldwide, certified audited income statement · Instructions for definition of certified audited
Part III, lines 26d, 26e, 27
Substitute interest payments, interest equivalents, substitute dividend payments · Financial records of amounts paid
Part II, line 2 (Cost of Goods Sold)
Amounts treated as cost of goods sold, including inventory adjustments · Inventory records, section 263A calculations
Part I, line 8 (Adjustments to intercompany transactions)
Statement detailing intercompany adjustments · Intercompany transaction records
Part I, line 9 (Adjustments to reconcile income statement period to tax year)
Statement explaining period adjustments · Income statements and tax year records
Before you submit
- 1Check the box at the top of Form 1120-F, page 1, indicating Schedule M-3 is attached
- 2Verify total assets on Schedule L, line 17, column (d) equal or exceed $10 million
- 3Complete Part I questions A, B, and C accurately
- 4Ensure Part I, line 11 equals Part II, line 28, column (a) or Schedule M-1, line 1
- 5Attach statements for adjustments on lines 8, 9, and 10 if applicable
- 6Complete Schedule M-2 and attach it to the return
- 7Sign and date Form 1120-F (the return, not the schedule)
- 8Keep a copy of the entire return including all schedules
- 9Review instructions for any special rules applicable to banks or non-banks
- 10Confirm the form revision date is 2025 (created 7/23/25)
How to file this form
- 1Determine if the foreign corporation meets the $10 million asset threshold on Schedule L line 17 col (d)
- 2Prepare non-consolidated financial statements (worldwide if available) for the period
- 3Complete Part I of Schedule M-3, including questions A, B, C and lines 4 through 11
- 4Complete Part II and Part III as required, attaching statements for adjustments
- 5Attach Schedule M-3 to Form 1120-F and check the box on page 1 of Form 1120-F
- 6Attach Schedule M-2 if required
- 7File the complete return with the IRS by the due date (including extensions)
- 8Retain a copy of the filed return and all supporting schedules for your records
Known limitations
- 1Only foreign corporations filing Form 1120-F with total assets of $10 million or more must file; those with less may file voluntarily
- 2Non-consolidated financial statements are required; consolidated statements are not accepted for Part I
- 3Corporations other than banks do not report allocation of expenses under Reg. 1.861-8 from Schedule H line 20 on Part III line 31
- 4Special rules apply to foreign banks for interest expense reporting on Part III lines 26d, 26e, and 27
- 5Schedule M-3 does not replace Schedule M-2; M-2 must still be completed
- 6The schedule is not used by domestic corporations or by foreign corporations not required to file Form 1120-F
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 2025 (created July 23, 2025). The instructions direct filers to IRS.gov/Form1120F for the latest information, including any legislative changes after publication. No specific changes from prior editions are noted in the source.
What changed or needs a fresh check
- Edition date — confirm the form revision is 2025 (created 7/23/25) and instructions are for 2025
- Fee — no separate fee; Schedule M-3 is attached to Form 1120-F (filing fee applies to the return)
- Mailing address — not stated in the official source; use the address for Form 1120-F from its instructions
- Signature — not required on Schedule M-3 itself; sign and date Form 1120-F
- Box at top of Form 1120-F — check the box indicating Schedule M-3 is attached
- Schedule M-2 — confirm it is also completed and attached
Quick Facts
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After you file
- 1Retain a copy of the filed Form 1120-F and all schedules (including M-3) for at least 3 years from the filing date
- 2Monitor IRS correspondence for any notices or requests for additional information
- 3If an error is discovered after filing, file an amended return using the appropriate form (e.g., Form 1120-X) — not stated in source; verify on agency site
- 4Check IRS.gov/Form1120F periodically for updates or changes to the form or instructions
- 5Keep records of the financial statements and adjustments used to prepare Schedule M-3
- 6If the IRS contacts you, provide the requested documentation promptly
Sources
- SRCInstructions p.1 — Who Must File: foreign corporation with total assets $10 million or more on Schedule L line 17 col (d) must file M-3 in lieu of M-1
- SRCInstructions p.1 — Purpose: determines adjusted financial net income of non-consolidated foreign corporation
- SRCInstructions p.1 — Schedule M-3 replaces Schedule M-1; M-2 still required
- SRCInstructions p.7 — Example with foreign disregarded entities and reporting of net income
- SRCInstructions p.8 — Special instructions for interest expense on line 26; non-banks do not report Schedule H line 20 on Part III line 31
- SRCInstructions p.12 — Cost of goods sold line 2 reporting; do not include amounts reportable on Part II line 12
- SRCForm p.1 — Questions A, B, C and line 11 must equal Part II line 28 col (a) or M-1 line 1
- SRCForm p.1 — Revision date 2025, created 7/23/25
- SRCNot stated in the official source — mailing address for Schedule M-3; use Form 1120-F address
- SRCNot stated in the official source — specific penalty for failure to file M-3; refer to Form 1120-F instructions
Common confusion points
What is the asset threshold for filing M-3?
The source states $10 million on Schedule L line 17 col (d)
→ Check Schedule L line 17 col (d) of Form 1120-F for total assets at year-end
Do I need a certified audited income statement?
Part I question B asks if the corporation prepared a certified audited statement
→ Review instructions for definition of 'certified audited' and answer accordingly
What is a non-consolidated financial statement?
The instructions define it as the financial statement of the foreign corporation without consolidation
→ Refer to instructions page 1 for the definition
How do I report interest expense for a bank?
Special instructions for line 26 apply to banks
→ See instructions page 8 for details on lines 26d, 26e, 27
Can I file M-3 voluntarily if my assets are under $10 million?
Yes, the instructions allow voluntary filing
→ Check the box on Form 1120-F indicating M-3 is attached
What is the difference between M-3 and M-1?
M-3 is more detailed and requires reconciliation of financial net income; M-1 is simpler
→ Use M-3 if assets are $10M+; otherwise use M-1 unless voluntarily filing M-3
What if my assets are exactly $10 million?
The threshold is 'equal or exceed' $10 million
→ Confirm the amount on Schedule L line 17 col (d) is at least $10,000,000
Do I still need Schedule M-2 if I file M-3?
Yes, the instructions state M-2 is still required
→ Attach completed Schedule M-2 to the return
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Questions about IRS Form 1120FM3
What is IRS Form 1120FM3 used for?
This schedule is used by large foreign corporations to explain the difference between the income they report on their financial books and the income they report on their tax return. It helps the IRS check that the numbers match up correctly. You attach it to your main tax form (Form 1120-F).
Who must file IRS Form 1120FM3?
Any foreign corporation required to file Form 1120-F that reports total assets of $10 million or more at the end of the tax year on Schedule L, line 17, column (d) must file Schedule M-3. Foreign corporations not required may voluntarily file.
What information does IRS Form 1120FM3 require?
The form collects financial information and reconciles net income per books with income per return. Part I reports financial data and net income reconciliation; Parts II and III list adjustments with detailed descriptions for each amount.
When is IRS Form 1120FM3 due?
Schedule M-3 must be attached to the foreign corporation’s Form 1120-F income tax return. The due date of Form 1120-F is not stated in the provided source.
Where do I file IRS Form 1120FM3?
Attach Schedule M-3 to the foreign corporation’s Form 1120-F income tax return. The source does not specify a separate mailing address; it is filed with the return.
How do I complete IRS Form 1120FM3?
Complete Part I for any tax year for which Schedule M-3 is filed. Then complete Parts II and III for adjustments, ensuring each amount has a detailed description. Attach the schedule to Form 1120-F and check the box on page 1 indicating Schedule M-3 is attached. Sign and date the return.
What is the asset threshold for filing M-3?
The source states $10 million on Schedule L line 17 col (d) Check Schedule L line 17 col (d) of Form 1120-F for total assets at year-end
Do I need a certified audited income statement?
Part I question B asks if the corporation prepared a certified audited statement Review instructions for definition of 'certified audited' and answer accordingly
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