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IRSCorporate Tax (1120 Series)

Official form guide

Form 1120FM3: 1120-F (Schedule M-3)

Form 1120-F Schedule M-3 is a supplemental reconciliation of financial statement income to taxable income for foreign corporations filing Form 1120-F. It is required when the corporation’s total assets exceed $10 million or it files a 1120-F with a Schedule M-3 attachment.

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Form Overview

IRS Form 1120FM3 - 1120-F (Schedule M-3)

Form 1120-F Schedule M-3 is a supplemental reconciliation of financial statement income to taxable income for foreign corporations filing Form 1120-F. It is required when the corporation’s total assets exceed $10 million or it files a 1120-F with a Schedule M-3 attachment.

It captures adjustments between book income and taxable income, detailed asset and liability categories, and reconciliation of depreciation, amortization, and other expense items.

Risk Radar

Scan points
  • 1A single arithmetic error can cause the entire return to be rejected.
  • 2Mismatched totals between Schedule M‑3 and Form 1120‑F
  • 3Omitting required asset or liability categories
  • 4Incorrect depreciation or amortization adjustments
  • 5Using the wrong edition of the schedule (e.g., prior year version)

Plain English

If a foreign company does a U.S. corporate tax return and has a big balance sheet, the IRS wants to see a line‑by‑line match between its book profit and the profit it reports for tax. Schedule M‑3 shows that match. It’s a detailed worksheet, not a simple summary.

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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Glossary Terms

liabilityfinancialforeignexceedincome

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What this form is for

  • Use when filing Form 1120‑F and assets exceed $10 million.
  • Do not use if the corporation’s assets are $10 million or less and no other M‑3 requirement applies.
  • Check Form 1120‑F instructions for any alternative reconciliation (e.g., Schedule M‑1) before proceeding.

Form selector

Use this form or another form?

Assets ≤ $10 million

Simpler reconciliation, fewer line items

✓ Verify asset threshold first

Form 1120‑F Schedule M‑1

Corporation elects to file as a partnership

Different filing entity

✓ Confirm entity classification

Form 1065 Schedule K‑1

Field map

Compact field-by-field guide

9 fields

Entity Info

2 items

Corporation Name and EIN

Full legal name of the corporation and its Employer Identification Number.

Requiredtext
Address and Date Incorporated

Current mailing address and date of incorporation.

Requiredtext

Income

3 items

Gross Receipts or Sales

Total revenue from business operations before deducting costs.

Requiredamount
Cost of Goods Sold

Direct costs attributable to producing goods sold by the corporation.

amount
Total Income

Gross receipts minus cost of goods sold and returns/allowances.

Requiredamount

Deductions

1 items

Total Deductions

Sum of all business expenses including compensation, rent, interest, taxes, and depreciation.

Requiredamount

Tax

2 items

Taxable Income

Total income minus total deductions.

Requiredamount
Total Tax

Tax calculated on taxable income using the applicable corporate tax rate, minus any credits.

Requiredamount

Signatures

1 items

Officer Signature

An authorized corporate officer must sign and date the return.

Requiredsignature
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Current form status
IRS

The 2024 edition of Schedule M‑3 is active. Verify the edition date on the form header before use. No filing fee is associated with the schedule itself; fees apply to the underlying 1120‑F if any.

What changed or needs a fresh check

  • Edition date – confirm the form shows 2024
  • Fee – none for Schedule M‑3 itself
  • Mailing address – use the address in{Form 1120‑F instructions for the filing year }
  • Electronic filing – ensure software supports Schedule M‑3 for the tax year
  • Signature line – authorized officer must sign
  • Paper size – US Letter, portrait orientation
  • PDF version – if e‑filing, use the IRS‑approved PDF format
  • Form number – verify it reads “1120‑F Schedule M‑3”

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Quick Facts

Foreign corporations filing Form 1120-F with assets over $10 million, or those otherwise required by the instructions, must file Schedule M‑3.
It captures adjustments between book income and taxable income, detailed asset and liability categories, and reconciliation of depreciation, amortization, and other expense items.
Schedule M‑3 is filed together with the 1120‑F return, generally by the 15th day of the fourth month after the corporation’s tax year ends (e.g., April 15 for calendar‑year filers).
Submit the completed Schedule M‑3 as part of the 1120‑F packet to the IRS address listed in the 1120‑F instructions, or e‑file using approved tax‑software that supports Schedule M‑3.
Errors in the reconciliation can trigger IRS penalties, delay processing, or lead to an audit of the foreign corporation’s U.S. tax position.
1. Gather the corporation’s financial statements and the 1120‑F draft. 2. Identify each line‑item adjustment between book and tax bases. 3. Complete Part I (reconciliation of income) and Part II (reconciliation of assets, liabilities, and equity). 4. Review totals for consistency with the 1120‑F. 5. Sign and attach to the 1120‑F before filing.

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Copyright & Licensing - US Government Forms

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Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
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