Form 1120-F, U.S. Income Tax Return of a Foreign Corporation
Form 1120-F is the U.S. income tax return for foreign corporations. It covers both income effectively connected with a U.S. trade or business and U.S.-source income taxed on a gross basis.
This is the genuine IRS PDF, unmodified. Source: IRS official page.
What is 1120-F?
A foreign corporation uses Form 1120-F to report its U.S. income, gains, losses, deductions, and credits and to figure its U.S. income tax liability. The return separates income into sections: Section I for U.S.-source income not connected with a U.S. business (typically taxed at a flat rate on the gross amount), and Section II for income effectively connected with a U.S. trade or business, which is taxed on a net basis like a domestic corporation’s income.
The form also handles the branch profits tax in Section III and carries supporting schedules for interest expense allocation, deductions tied to effectively connected income, and treaty-based positions. Corporations with $10 million or more in reportable assets complete Schedule M-3 to reconcile book and taxable income.
Who files 1120-F?
- Foreign corporations engaged in a trade or business in the United States, whether or not they had U.S. income
- Foreign corporations with U.S.-source income whose tax was not fully satisfied by withholding at source
- Foreign corporations filing to claim a refund, a treaty-based position, or deductions and credits
- Some filers claim exclusions such as section 883 for international shipping or aircraft income on this return
How to fill out 1120-F
- Complete the header with the corporation’s name, country of incorporation, U.S. EIN, and the questions about U.S. business activity.
- Report U.S.-source income not effectively connected with a U.S. business in Section I, along with the withholding already applied.
- Report effectively connected income and deductions in Section II to reach net taxable income.
- Work through Section III for the branch profits tax and tax on excess interest, if they apply.
- Download the completed PDF and file by the due date in the current instructions, which depends on whether the corporation has a U.S. office.
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Frequently asked questions
Does a foreign corporation with no U.S. income ever need to file?
Often yes. A foreign corporation engaged in a U.S. trade or business generally files Form 1120-F even if it had no effectively connected income, and filing protects the right to claim deductions and credits.
What is effectively connected income?
Income tied to the conduct of a trade or business in the United States. It is taxed on a net basis at regular corporate rates, unlike passive U.S.-source income, which is generally taxed at a flat rate on the gross amount, often collected through withholding.
Can a tax treaty change what goes on Form 1120-F?
Yes. Treaties can reduce rates or exempt business profits not attributable to a U.S. permanent establishment. Treaty-based return positions are typically disclosed on Form 8833 attached to the return.