A U.S. branch is the foreign corporation operating here without creating a separate U.S. entity; a U.S. subsidiary is a domestic corporation with its own federal return. The choice changes how U.S. business income is reported and how profits paid or attributed to the foreign parent may be taxed. Neither structure is automatically cheaper: the result depends on the company’s activities, deductions, financing, distributions, state footprint and any applicable tax treaty.
This comparison covers U.S. federal income tax and federal reporting, based on IRS guidance and the 2025 tax-year Form 1120-F instructions available as of October 4, 2026. It is not a state-by-state analysis.
At a glance: what changes between a branch and a subsidiary?
| Question | U.S. branch | U.S. subsidiary |
|---|---|---|
| What is operating in the United States? | The foreign corporation itself, without a new U.S. legal entity. | A domestic corporation separate from its foreign shareholder. |
| Primary federal income tax return | Form 1120-F when a filing condition applies. | Form 1120 for the domestic corporation. |
| Potential tax when profits benefit the foreign owner | Branch profits tax may apply to a statutory dividend-equivalent amount. | U.S. withholding may apply to dividends paid to a foreign beneficial owner. |
| Foreign-owner reporting to check | Form 1120-F and applicable schedules. | Form 5472 if the ownership and reportable-transaction conditions are met. |
How a U.S. branch is taxed and reported
U.S. trade or business and Form 1120-F
The IRS treats a foreign corporation operating through a U.S. branch as engaged in a U.S. trade or business (USTB). More generally, whether activities amount to a USTB depends on the facts; the IRS describes the general test in terms of considerable, continuous and regular profit-seeking activity in the United States. U.S.-based employees acting for the foreign corporation can also create a USTB. The determination is not automatic for every U.S. contact or transaction.
When filing is required, the foreign corporation generally uses Form 1120-F to report income, gains, losses, deductions and credits and calculate U.S. income tax. The return reports effectively connected income (ECI)—income connected with the U.S. trade or business under the applicable rules. Under the IRS’s 2025 Form 1120-F instructions, ECI is taxed at the 21% corporate rate applicable to domestic corporations, after allowable deductions. That is not a 21% tax on gross U.S. receipts: the taxable base depends on which income is ECI and which deductions can be claimed and allocated.
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The 2025 instructions also describe a protective Form 1120-F filing for certain foreign corporations that conclude they have no ECI from limited U.S. activities. A protective return may preserve access to deductions and credits if the IRS later determines that the corporation did have ECI. Whether a return is required, and which filing position is appropriate, turns on the company’s activities and income.
Branch profits tax: the calculation is not simply a remittance tax
Under section 884(a), the IRS’s 2025 Form 1120-F instructions state a 30% statutory branch profits tax on the relevant after-tax earnings and profits of a foreign corporation’s U.S. trade or business that are not reinvested in that business by year-end, or are disinvested later. The calculation uses a dividend-equivalent amount and U.S. net equity mechanics. It should not be treated as a tax on every cash transfer to the parent merely because money crossed the border.
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An applicable income tax treaty may reduce the branch profits tax rate, but treaty relief is conditional. The relevant treaty, residence, and any limitation-on-benefits requirements need to be checked for the particular company. The IRS instructions also describe a tax on excess interest in some circumstances; that specialized issue is relevant to certain financing arrangements, not a universal additional tax on every branch.
How a U.S. subsidiary is taxed and reported
Corporate return and dividends to the foreign owner
A U.S. subsidiary is a domestic corporation and generally 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 lower treaty rate or exemption may be available when the applicable treaty requirements are satisfied and the necessary documentation is in place. The subsidiary’s corporate return and tax are distinct from withholding on a dividend paid to its foreign shareholder.
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When Form 5472 may apply
A corporation that is at least 25% foreign-owned generally must file Form 5472 when it has a reportable transaction with a related party during the tax year. Foreign ownership by itself does not make Form 5472 automatic under this general rule: the reportable-transaction condition matters. The form instructions determine which transactions, exceptions, records and deadlines apply to a particular case, so check the current instructions rather than assuming that every payment to or from a parent is treated the same way.
How treaties affect either structure
There is no single treaty outcome for all foreign-owned U.S. operations. The result depends on the parent’s country, the treaty currently in force, the company’s residence and (where relevant) beneficial ownership, the type of income, and applicable limitation-on-benefits provisions. For a branch, examine the treaty’s business-profits and branch-profits provisions; for a subsidiary, examine its dividend article and the requirements for claiming reduced withholding. The IRS advises checking the actual treaty provisions and conditions rather than assuming a reduced rate applies.
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State and local compliance is a separate analysis
Federal forms do not settle whether a company must register, file returns or meet other obligations in a particular state or locality. The answer depends on where and how it operates. Depending on the facts and jurisdiction, a company may need to assess foreign qualification, state income or franchise taxes, payroll, sales tax, annual reports and other requirements. Forming a subsidiary in one state does not, by itself, determine its obligations in other states where it does business. The same state-by-state review is needed for a branch.
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The federal tax differences alone are not enough to establish which structure costs less overall. Build the comparison around the company’s actual operating and cash-flow plan, including:
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- Where the company will have employees, property, customers and business activity, and whether those facts create a USTB or ECI.
- Expected U.S. income and allowable deductions, including how expenses will be allocated to U.S. activity.
- Whether earnings will remain invested in the U.S. business, be distributed as subsidiary dividends, or be moved through another arrangement.
- Parent-company country, treaty eligibility and the documentation needed to claim treaty benefits.
- Related-party transactions, ownership percentage and any Form 5472 reporting obligation.
- States and localities where the company expects to operate, hire or make sales.
Because these facts can change both the filing position and the tax calculation, a qualified U.S. international-tax adviser can model the two paths against the company’s specific structure and plans.
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