A permanent establishment is the level of business presence a foreign company must have in another country before that country can tax its local profits. The concept sits at the heart of nearly every bilateral tax treaty and follows standardized language from the OECD and United Nations model conventions. Cross the threshold, and the host country can tax the profits attributable to that presence. Stay below it, and the host country generally cannot impose corporate income tax on the company’s earnings, even where remote sales are being made into that market.
The threshold can be crossed in several ways: through a physical location, a long-running construction project, an employee’s activities on the ground, or an agent acting on the company’s behalf. Each has its own test, and the tests apply independently.
Fixed Place of Business
The most common trigger is a fixed place of business. Under the OECD Model Tax Convention, a permanent establishment exists where an enterprise maintains a specific physical location and carries out its business through it. Offices, branches, factories, and workshops are the classic examples, but any space that serves as a regular base of operations can qualify.
Three elements have to line up. There must be an actual place with an identifiable geographic location. The place must be “fixed,” meaning it has some degree of permanence rather than being temporary or mobile; most treaty interpretations look for something lasting more than several months, though no single bright-line rule applies across all treaties. And the business must actually carry out its activities through that location, not merely own the space.
The company does not need to hold title or a lease. What matters is whether the space is “at the disposal” of the enterprise, meaning the company has enough control to use it as a working base. A consultant occupying a dedicated desk at a client’s site for an extended engagement can create a permanent establishment for the consulting firm, even without any formal rental agreement. The test looks at reality over paperwork. If employees regularly show up to a specific location and do their core work there, the disposal requirement is likely met.
Some locations are treated as fixed places of business by default because of their inherent geographic connection: mines, oil wells, quarries, and similar extraction sites.
Construction and Installation Projects
Building sites and installation projects get their own rule because they are temporary by nature but can represent substantial economic activity. Under the OECD Model, a construction or installation project becomes a permanent establishment only if it lasts more than twelve months. The UN Model sets a shorter threshold of six months, reflecting the interest of developing countries in taxing foreign contractors working on their soil.1United Nations. UN Model Double Taxation Convention Between Developed and Developing Countries
The clock starts when the contractor begins work, including preparatory activities at the site, and runs continuously through temporary interruptions like bad weather or labor disputes. Once the project crosses the threshold, the entire duration becomes taxable from day one. A company cannot reset the clock by pausing briefly or shuffling subcontractors. Where closely related companies split a single project into shorter contracts to stay under the threshold, tax authorities can aggregate the time periods and treat them as one continuous project.
Remote Employees and Home Offices
Cross-border remote work has created real uncertainty about whether an employee’s home can count as a permanent establishment for their employer. The OECD addressed this in its 2025 update to the Model Tax Convention, adding guidance on when a home office crosses the line.
The starting point is the same “at the disposal of the enterprise” test that applies to any fixed place. An employee who works from home in another country less than 50% of their total working time over a twelve-month period generally does not create a permanent establishment. Exceeding that 50% mark does not automatically create one either. The critical question is whether there are genuine commercial reasons for the employee to be in that country.
Commercial reasons include meeting local customers, building a new client base, managing supplier relationships, or providing real-time services across time zones. If the company simply allows remote work for the employee’s personal convenience or to reduce office costs, the home is not “at the company’s disposal.” An employee who works from a beach house because they prefer the climate is different from an employee stationed in a country to serve that market.
Agents Acting on the Company’s Behalf
A company can trigger a taxable presence even without any office if someone is acting on its behalf in the host country. Under the OECD Model, when a person habitually concludes contracts that bind a foreign enterprise, or plays the principal role in negotiating contracts that the foreign company routinely signs without meaningful changes, that activity creates a permanent establishment.
The key distinction is between dependent and independent agents. A dependent agent works under the direction and control of the foreign company and does not bear their own business risk. An independent agent, such as a general broker who serves multiple clients and runs their own operation, typically does not create a permanent establishment. But independence gets questioned fast when an agent works almost exclusively for one foreign company. If someone walks, talks, and sells like an employee, the “independent contractor” label on the agreement will not save the arrangement.
This area saw significant changes under the OECD’s Base Erosion and Profit Shifting (BEPS) project. Before BEPS Action 7, some companies used “commissionnaire” arrangements where a local agent would negotiate every element of a deal but stop short of signing the contract, with the foreign parent rubber-stamping it from abroad. The updated rules look at who plays the principal role in bringing the contract into existence, not just who puts pen to paper.2OECD. Preventing the Artificial Avoidance of Permanent Establishment Status – Action 7 Final Report If the agent’s activities lead directly to the conclusion of contracts by the foreign enterprise, a permanent establishment exists regardless of the formal signing mechanics.
Services Provided On the Ground
The OECD Model does not include a standalone service permanent establishment rule, but the UN Model does. Under the UN Model, a permanent establishment arises when a foreign enterprise furnishes services, including consulting, through employees or other personnel present in a country for more than 183 days within any twelve-month period.1United Nations. UN Model Double Taxation Convention Between Developed and Developing Countries This rule appears in many treaties involving developing nations and targets situations where high-value professional services are delivered on the ground without any fixed office.
The 183-day count is cumulative. If a company sends different employees into the country on rotating assignments, every day any of them spends there counts toward the total. Engineering firms, management consultancies, and IT services companies are particularly exposed to this rule when they embed staff at client sites for long-term projects. The nature of the work matters as well: the services must go beyond preparatory or support functions.
Companies sending employees across borders need to track travel records and project timelines carefully. Exceeding the 183-day threshold triggers corporate tax registration and filing obligations in the host country, and may also trigger withholding tax on local income. Discovering it after the fact is where things get expensive, because retroactive compliance means back taxes, interest, and potential penalties.
Activities That Do Not Cross the Line
Not every business activity in a foreign country rises to the level of a permanent establishment. The OECD Model explicitly excludes activities that are “preparatory or auxiliary” in nature. Support functions that do not directly generate profits should not trigger local taxation.
Common examples include maintaining a warehouse solely for storing or delivering the company’s goods, keeping inventory on hand for processing by another business, and operating an office that does nothing but collect market information or run advertising campaigns.
The catch is that “preparatory or auxiliary” is measured against the company’s actual business model, not some abstract standard. If a company’s primary business is logistics, a local warehouse is not a support function. It is the core operation.
BEPS Action 7 also added anti-fragmentation provisions to close a well-known loophole. Companies used to split their local operations among several related entities, each performing a slice of the business small enough to qualify as preparatory or auxiliary on its own. A parent might set up one subsidiary for warehousing, another for customer service, and a third for order processing, with no single entity crossing the threshold.2OECD. Preventing the Artificial Avoidance of Permanent Establishment Status – Action 7 Final Report Under the updated rules, where related entities carry out activities in the same country that form a cohesive business operation, tax authorities can treat the combined activities as a single permanent establishment.
How Profits Are Taxed Once a PE Exists
Establishing that a permanent establishment exists is only half the equation. The next question is how much profit the host country can actually tax. Under Article 7 of the OECD Model, the host country may tax only profits attributable to the permanent establishment, not the company’s entire worldwide income. The permanent establishment is treated as if it were a separate, independent enterprise conducting arm’s-length transactions with the rest of the company.
In practice, the company must allocate revenue and expenses between the permanent establishment and its head office using transfer pricing principles. If a U.S. software company has a permanent establishment in Germany because of a sales office there, Germany can tax the profits generated through that office, but not the profits from the company’s U.S. operations or its sales into other countries. Getting the allocation wrong in either direction creates problems: overallocating profits means overpaying in the host country, while underallocating invites audits and adjustments.
When two countries disagree about how much profit belongs to a permanent establishment, most tax treaties include a mutual agreement procedure that lets the competent authorities negotiate. If they cannot reach agreement, relief from double taxation is not guaranteed, and the company may end up paying tax on the same income in both places.
U.S. Filing Obligations for Foreign Corporations
For foreign corporations doing business in the United States, the domestic rules run in parallel with treaty rules. Under federal law, a foreign corporation engaged in a trade or business within the United States is taxed on income “effectively connected” with that activity.3Office of the Law Revision Counsel. 26 USC 882 – Tax on Income of Foreign Corporations Connected With United States Business Where a treaty applies, the company can argue that its effectively connected income is not attributable to a U.S. permanent establishment and therefore not taxable. Making that argument comes with disclosure requirements.
Form 1120-F
A foreign corporation with U.S. income or a U.S. permanent establishment files Form 1120-F, the U.S. income tax return for foreign corporations. Even where the company believes it owes no U.S. tax because a treaty shields the income, it should file a “protective” return to preserve its right to claim deductions and credits. A foreign corporation that skips this filing can lose the right to deduct expenses against effectively connected income entirely.4IRS. 2025 Instructions for Form 1120-F The protective return must be filed no later than 18 months after the original due date to be considered timely for that purpose.
Form 8833
When a foreign corporation takes the position that a U.S. tax treaty overrides the Internal Revenue Code, it must disclose that position on Form 8833.5Office of the Law Revision Counsel. 26 USC 6114 – Treaty-Based Return Positions This includes claiming that effectively connected income is not attributable to a U.S. permanent establishment, or that a treaty modifies the amount of business profits allocated to one.6IRS. Form 8833 – Treaty-Based Return Position Disclosure Under Section 6114 or 7701(b) Where the corporation would not otherwise need to file a return, it must still file one solely to make this disclosure.
What Missing These Filings Costs
The consequences of failing to recognize or properly report a permanent establishment go well beyond back taxes. A C corporation that fails to disclose a treaty-based return position on Form 8833 faces a penalty of $10,000 for each failure. For taxpayers other than C corporations, the penalty is $1,000 per failure.7Office of the Law Revision Counsel. 26 USC 6712 – Failure to Disclose Treaty-Based Return Positions A foreign corporation that does not file Form 1120-F by the due date, including extensions, faces a penalty of 5% of unpaid tax for each month or partial month the return is late, up to 25% of the unpaid tax. For returns required to be filed in 2026 that are more than 60 days late, the minimum penalty is the lesser of the tax due or $525.4IRS. 2025 Instructions for Form 1120-F
The most painful consequence is usually the loss of deductions and credits. A foreign corporation that does not file a timely and accurate Form 1120-F forfeits its right to claim any deductions or credits against effectively connected income, meaning it could be taxed on gross revenue rather than net profit.3Office of the Law Revision Counsel. 26 USC 882 – Tax on Income of Foreign Corporations Connected With United States Business Filing a protective return, even when confident no permanent establishment exists, is cheap insurance against that outcome. Companies that fail to coordinate filings between the home and host country also risk being taxed on the same income by both jurisdictions, and mutual agreement procedures are slow with no guaranteed resolution.
Where employees work in the United States and create or support a permanent establishment, the employer also takes on U.S. payroll tax obligations, including federal income tax withholding on wages paid to nonresident alien employees and standard social security and Medicare taxes.8IRS. Publication 15 (2026), Employer’s Tax Guide Some treaties exempt certain workers from social security obligations in the host country, but eligibility must be confirmed and the proper documentation secured.
What Permanent Establishment Still Does Not Cover
The permanent establishment concept was designed for a world of factories, offices, and traveling salespeople. Digital business models that generate billions in revenue from a country without any local employees or physical assets have exposed the limits of that framework. A social media platform or streaming service can dominate a market without triggering a permanent establishment under current treaty rules.
The OECD’s Pillar One initiative (Amount A) was designed to close that gap by reallocating a portion of taxable profits to countries where large multinationals make sales to end consumers, regardless of physical presence. The rules would initially apply to companies with global revenues above roughly EUR 20 billion and profit margins above 10%. As of 2026, the multilateral treaty implementing Amount A has not been finalized, in large part because U.S. ratification remains uncertain and the treaty cannot take effect without it. In the meantime, a growing number of countries have imposed or proposed their own digital services taxes as a stopgap.
For now, the traditional permanent establishment rules remain the primary framework, and companies operating across borders should treat the existing tests as the ones they will actually be held to.