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A U.S. branch is the foreign corporation operating in the United States without forming a separate U.S. entity; a U.S. subsidiary is a separate domestic corporation. The branch generally follows the foreign-corporation filing rules, while the subsidiary files as a U.S. corporation. Each can also face a different potential tax when earnings are treated as leaving the U.S. business. Neither structure is universally more tax-efficient: the result depends on the company’s activities, financing, distributions, treaty eligibility, and state footprint.
How the two structures differ
| Issue | U.S. branch | U.S. subsidiary |
|---|---|---|
| Legal identity | The foreign corporation conducts business in the United States without creating a new legal entity. | A domestic corporation formed under U.S. law is separate from its foreign shareholder. |
| Main federal income tax return | Form 1120-F when a filing condition applies; it reports the foreign corporation’s U.S. income under foreign-corporation rules. | Form 1120 for the domestic corporation. |
| Potential tax on earnings leaving the U.S. business | Branch profits tax may apply to a statutory dividend-equivalent amount. | U.S.-source dividends paid to a foreign beneficial owner generally face withholding. |
| Foreign-owner reporting | Form 1120-F and applicable schedules; requirements depend on the facts. | Form 5472 may be required if the foreign-ownership and related-party transaction conditions are met. |
| State obligations | Depend on where and how the company operates. | Also depend on where and how it operates; forming in one state does not settle obligations elsewhere. |
How a branch is taxed and when Form 1120-F applies
U.S. trade or business and effectively connected income
A foreign corporation operating through a U.S. branch is considered to be engaged in a U.S. trade or business (USTB), according to the IRS. More generally, the IRS describes a USTB as involving considerable, continuous, and regular profit-seeking activities in the United States; the determination is fact-specific, and U.S.-based employees acting for the foreign corporation can create a USTB.
Income effectively connected with that business (ECI) is reported under the foreign-corporation rules. The IRS Instructions for Form 1120-F (2025) state that ECI is taxed at the 21% corporate rate after allowable deductions. That is not a 21% tax on gross U.S. receipts: sourcing, whether income is effectively connected, and the deductions the corporation may claim affect the taxable base.
Filing, including a protective return
When a filing condition applies, Form 1120-F reports the foreign corporation’s income, gains, losses, deductions, and credits and computes its U.S. income tax. Filing requirements depend on the corporation’s activities and income, so a U.S. contact alone does not establish that every foreign company has the same filing obligation.
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The 2025 instructions also describe a protective-return route for certain limited U.S. activities when a foreign corporation concludes it has no ECI. Filing protectively can preserve access to deductions and credits if the IRS later determines that the income was ECI. Whether that route is appropriate depends on the facts and current filing rules.
What the branch profits tax actually applies to
The IRS Instructions for Form 1120-F (2025) state that the statutory branch profits tax rate is 30%. Its base is not simply every payment or cash transfer to the foreign parent. The tax generally applies to after-tax earnings and profits of the foreign corporation’s U.S. trade or business that are not reinvested in that business by year-end, or that are disinvested in a later year. The statutory calculation uses a dividend-equivalent amount and U.S. net equity mechanics.
An applicable income tax treaty may reduce the rate if the corporation satisfies the treaty’s conditions. The same instructions identify a tax on excess interest in some circumstances; that is a specialized issue to examine for relevant financing arrangements, not a universal charge on every branch.
How a subsidiary is taxed and what Form 5472 covers
Corporate return and distributions
A domestic subsidiary files Form 1120 to report its corporate income and tax. If it pays U.S.-source dividends to a foreign beneficial owner, the general U.S. withholding rate is 30%. A treaty may provide a lower rate or an exemption, but the applicable treaty, eligibility requirements, and documentation must be checked before applying relief.
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Related-party reporting
Form 5472 is not automatically required for every foreign-owned U.S. corporation. Under the IRS instructions, a corporation that is at least 25% foreign-owned generally must file the form if it has a reportable transaction with a related party during the tax year. The transaction condition matters. Definitions, exceptions, recordkeeping, due dates, and penalties depend on the circumstances and current Form 5472 instructions.
How treaties affect the comparison
There is no single treaty result for all foreign parents. The relevant provisions depend on the parent’s country and treaty residence, the type of income, beneficial ownership, and limitation-on-benefits requirements. For a branch, examine the treaty’s business-profits and branch-profits provisions; for a subsidiary, examine the dividend article and required documentation. The IRS’s treaty guidance and the current treaty text should be checked for the particular case. Treaty relief is conditional, not an automatic consequence of having a foreign parent.
State and local compliance is a separate decision
The federal comparison does not resolve state or local obligations. Depending on the jurisdictions and operating facts, either structure may need foreign qualification, tax registration, payroll or sales-tax compliance, annual reports, or other filings. Incorporating in one state does not by itself settle obligations in states where the company operates. A state-by-state review requires identifying the states, activities, employees, property, and sales involved.
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A useful comparison needs more than the headline federal rates. Map the company’s expected U.S. income and deductible costs, where employees and assets will be located, how the U.S. operation will be financed, whether earnings will remain in or leave the U.S. business, and which treaty may apply. Then evaluate the related filing and state obligations for each structure. Because USTB, ECI, treaty entitlement, and the branch profits tax are fact-sensitive, a qualified U.S. international-tax adviser can model the alternatives against the parent’s actual facts.
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