A US permanent establishment is the treaty threshold that decides whether a foreign company’s business profits can be taxed by the United States. If a treaty-country enterprise operates through a fixed place of business in the US, or through a dependent agent who habitually concludes contracts on its behalf, it has a permanent establishment and its US-attributable profits become taxable on a net basis at the 21% corporate rate, plus a branch profits tax on earnings deemed repatriated. Without a permanent establishment, the same company generally owes US tax only on passive income like dividends and interest, subject to a flat 30% withholding on gross amounts.
The stakes on this determination run in both directions. A foreign company that assumes it has no PE and later finds out otherwise can lose every deduction against its US income. A company that assumes it has one when it doesn’t may overpay for years.
The Fixed Place of Business Test
The core PE test asks whether the foreign enterprise has a “fixed place of business” through which it carries on business in the US. The US Model Income Tax Convention lists offices, branches, factories, workshops, places of management, mines, oil or gas wells, and quarries as examples.1Department of the Treasury. United States Model Income Tax Convention 2016
Two elements separate a permanent establishment from a business trip. The location has to be geographically fixed, tied to an identifiable spot rather than moving around. And the presence has to last long enough to be more than temporary. IRS guidance treats presence under six months as generally not a PE and presence over six months as generally a PE.2Internal Revenue Service. Creation of a Permanent Establishment Through the Activities of a Person Other Than an Agent of Independent Status A seasonal shutdown or similar temporary interruption doesn’t reset the clock.
Ownership doesn’t matter. Using another company’s space, including a related company’s, can create a PE if the use is regular and sustained. Sporadic or infrequent use of the same space generally does not.2Internal Revenue Service. Creation of a Permanent Establishment Through the Activities of a Person Other Than an Agent of Independent Status
Each US treaty has its own PE article, and definitions vary. The US Model is the template, not the actual rule for any given country. Check the treaty between the US and the enterprise’s country of residence before drawing conclusions.
Construction and Installation Projects
Building sites and construction or installation projects have their own threshold because they are inherently temporary. Under the US Model, a construction project creates a permanent establishment only if it lasts more than twelve months.1Department of the Treasury. United States Model Income Tax Convention 2016 Most US treaties use twelve months; a few use a different period.
An anti-abuse rule prevents companies from cycling related entities through the same site. If a foreign enterprise works at a site for less than twelve months, and a related enterprise works there for separate periods each exceeding thirty days, the periods get added together for the twelve-month test.
Once the threshold is crossed, the PE is treated as having existed from day one. Profits from the entire project become taxable retroactively, not just profits earned after month twelve. A contractor that underestimates a project timeline can face a US tax bill covering work already done before anyone thought a PE was in play.
When an Agent Creates a Permanent Establishment
A foreign enterprise can have a US permanent establishment without any office, warehouse, or job site of its own. The right kind of agent, acting in the US, can create one.
Dependent Agents
A dependent agent creates a PE when the agent acts on behalf of the enterprise and habitually exercises authority to conclude contracts that bind it. The contracts have to relate to the enterprise’s core business, not peripheral matters.3Internal Revenue Service. Dependent Agent Permanent Establishment “Habitually” is doing real work in that sentence. A single contract usually doesn’t create a PE. A pattern does.
This is where foreign companies most often trip. A US-based sales representative who regularly signs customer contracts on behalf of the foreign parent, or who negotiates all material terms so the parent’s sign-off is a formality, can create a PE even with no US office. Exclusivity heightens the risk: an agent working only, or almost only, for one foreign enterprise looks dependent regardless of the label on the contract between them.
Independent Agents
Brokers, commission agents, and other independent agents acting in the ordinary course of their own business do not create a PE, provided they have genuine economic independence. The markers are working for multiple principals, bearing their own business risk, and exercising discretion over how they work. When an agent’s business essentially depends on a single foreign enterprise, that independence collapses and the treaty treats the agent as dependent no matter what the paperwork says.
Activities That Don’t Create a Permanent Establishment
Some activities are considered too far removed from generating profits to justify US taxation. Under the US Model Treaty, these “preparatory or auxiliary” activities are carved out of the PE definition:1Department of the Treasury. United States Model Income Tax Convention 2016
- Using a US facility solely to store, display, or deliver the enterprise’s own goods
- Keeping US inventory solely for storage, display, or delivery
- Keeping a stock of goods solely for another enterprise to process
- Maintaining a fixed location solely to buy goods or collect information
- Any fixed place of business used solely for activities that support rather than generate the core revenue
The word “solely” is where these exceptions get lost. A warehouse that stores goods and also takes customer orders or handles returns is no longer used solely for storage. Once the activity crosses from support into revenue generation, the carve-out disappears.4Internal Revenue Service. Preparatory and Auxiliary Treaty Exception to Permanent Establishment Status
The US Model also has a combination rule: several qualifying activities at one location still qualify only if, taken together, they remain preparatory or auxiliary in character. Stacking support functions until they collectively amount to core operations forfeits the exception.
Separately, the OECD’s BEPS Action 7 introduced a broader anti-fragmentation rule aimed at companies splitting a single business operation across multiple locations so each one alone looks preparatory.5Organisation for Economic Co-operation and Development. Preventing the Artificial Avoidance of Permanent Establishment Status – Action 7 Final Report The US Model doesn’t adopt the full BEPS language, but some newer US bilateral treaties include versions of it. Check the applicable treaty.
What Changes When a PE Exists
A permanent establishment shifts the foreign corporation from gross withholding on passive US income to net-basis income taxation on the profits its US operations produce. The rate can be lower after deductions. The compliance load is considerably heavier.
Only PE-Attributable Profits Are Taxed
The US taxes only profits attributable to the permanent establishment, not the enterprise’s worldwide income. Article 7 of the US Model Treaty treats the PE as a separate entity dealing at arm’s length with the foreign head office.1Department of the Treasury. United States Model Income Tax Convention 2016 That means transfer pricing documentation, allocating income and expenses between the PE and the rest of the enterprise as if they were unrelated parties.
Under domestic law, this is called effectively connected income, or ECI. It includes income from assets used in the US business and income from activities conducted through the US presence.6Office of the Law Revision Counsel. 26 U.S. Code 864 – Definitions and Special Rules ECI is taxed at the 21% corporate rate on a net basis, so allocable expenses are deductible.7Office of the Law Revision Counsel. 26 USC 882 – Tax on Income of Foreign Corporations Connected With United States Business Passive US-source income (dividends, interest, rents) that isn’t tied to the US business stays outside ECI and remains subject to the 30% gross withholding.8Internal Revenue Service. Gross Effectively Connected Income of a Foreign Corporation – Non-Treaty
The Branch Profits Tax
A foreign corporation operating through a US permanent establishment faces a second layer of tax. The branch profits tax applies a 30% rate to the PE’s after-tax earnings treated as sent back to the foreign head office, an amount called the “dividend equivalent amount.”9eCFR. 26 CFR 1.884-1 – Branch Profits Tax
The purpose is parity. If the foreign company operated through a US subsidiary instead of a branch, dividends from that subsidiary to the foreign parent would be subject to withholding. The branch profits tax closes that gap for enterprises operating through a PE, which is a branch, not a separate entity. The statutory 30% rate is reduced or eliminated by most US income tax treaties.10Internal Revenue Service. Branch Profits Tax Concepts
Form 1120-F and the Deadline That Costs You Deductions
A foreign corporation with effectively connected income files Form 1120-F, the US income tax return for foreign corporations.11Internal Revenue Service. About Form 1120-F, U.S. Income Tax Return of a Foreign Corporation Filing is mandatory even when a treaty provision eliminates the actual tax owed. Skipping it is the most consequential mistake in this area.
Here’s why. A foreign corporation that fails to file a timely return loses the right to claim deductions and credits against its ECI. The IRS then taxes the company on gross US income, with no offset for the costs of earning it.12eCFR. 26 CFR 1.882-4 – Allowance of Deductions and Credits to Foreign Corporations For a company with thin margins and heavy US expenses, the difference between gross and net is enormous.
The return generally must be filed within 18 months of the original due date to preserve deductions. If no return was filed for the preceding year, the deadline becomes the earlier of 18 months after the due date or the date the IRS sends a notice that the return is missing.12eCFR. 26 CFR 1.882-4 – Allowance of Deductions and Credits to Foreign Corporations After that window closes, only a showing of reasonable cause and good faith may save the deductions, and the IRS grants that waiver sparingly.
Protective Returns
Foreign companies in ambiguous situations should file a protective return. It’s the right move when the company believes it has no ECI or no PE under a treaty, but wants to preserve deductions in case the IRS later disagrees. A protective return means checking the “Protective return” box on Form 1120-F and completing limited sections. If a treaty exemption is being claimed, Form 8833 (Treaty-Based Return Position Disclosure) must be attached.13Internal Revenue Service. 2025 Instructions for Form 1120-F The cost is minimal if the company’s position is correct. The value, if the IRS challenges the PE analysis years later, can be everything the company would have deducted.
Late-Filing Penalties
Beyond the loss of deductions, standard IRS penalties apply. Failure-to-file runs 5% of unpaid tax per month, capped at 25%. Failure-to-pay runs 0.5% per month, also capped at 25%. A fraudulent failure to file raises the filing penalty to 15% per month with a 75% cap.14Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax For returns due after December 31, 2025 and filed more than 60 days late, the minimum penalty is the lesser of $525 or the full tax owed.15Internal Revenue Service. Failure to File Penalty Usually, though, the penalty is not the real cost. The lost deductions are.
State Taxes Follow Their Own Rules
One boundary worth knowing: federal PE analysis does not control state taxation. Most US states have their own corporate income taxes, and many now use economic nexus tests that reach further than the federal permanent establishment threshold. A foreign company can have no federal PE and still owe state income tax based on sales volume or transaction counts within a state.
After the Supreme Court’s 2018 decision in South Dakota v. Wayfair, states moved away from requiring physical presence as the sole basis for tax jurisdiction. Many use bright-line dollar or transaction thresholds; others apply broader substantial-economic-activity standards. Foreign corporations often need to register as a foreign entity in each state where they have nexus, pay annual reporting fees, and file separate state returns. State rules differ from federal PE standards and from each other, so state exposure needs its own analysis.