Permanent Establishment: Doing Business Across the Border

A business does not have to incorporate, lease an office, or hire a single local employee to become taxable in another country. The trigger is a legal concept — the permanent establishment, or PE — and a Canadian company selling into the United States, or a U.S. company taking on Canadian projects, can cross that line without ever deciding to. When it does, the other country can tax the profits attributable to that presence, demand a corporate return, and assess withholding and penalties as well. The reason this matters so much is that the entire treaty framework for cross-border business income is built on a single question: is there a permanent establishment, or not?

This page explains how the permanent-establishment concept works under the Canada-U.S. tax treaty, how each country taxes a business that crosses the line, how the treaty allocates the profits, and the traps that create an inadvertent PE. It is general information, not legal advice.

Why the permanent-establishment question decides everything

Under Article VII (Business Profits) of the Canada-United States Income Tax Convention, the business profits of an enterprise of one country are taxable only in that country unless the enterprise carries on business in the other country through a permanent establishment situated there. If a PE exists, the other country may tax the profits — but only those profits that are attributable to the PE. So the threshold question is binary and high-stakes: no PE means a treaty exemption from the other country's income tax on the business profits; a PE means a filing obligation and tax on the income that the presence generated.

It is important to separate two different ideas that often get blurred. Carrying on business in the other country is what triggers a domestic filing obligation and brings the income within reach of the local tax system. The permanent-establishment test in the treaty is the higher threshold that determines whether that country is actually permitted to tax the profits. A Canadian company can be carrying on business in the U.S. — enough to owe a U.S. return — yet still claim a treaty exemption from U.S. federal income tax because it has no PE. The catch is that the exemption is not automatic; it has to be claimed correctly, and that is where many businesses come unstuck.

What creates a permanent establishment under Article V

Article V of the treaty defines a permanent establishment as a fixed place of business through which the business of an enterprise is wholly or partly carried on. The familiar examples are listed in the article itself: a place of management, a branch, an office, a factory, a workshop, and places of extraction of natural resources. The common thread is a fixed, identifiable location at the enterprise's disposal where its business is conducted with some degree of permanence. Beyond that core definition, several specific rules expand or limit when a PE arises.

Construction and installation projects. A building site or a construction or installation project is a permanent establishment, but only if it lasts more than twelve months. A project that wraps up in eleven months does not create a PE; one that drags past the twelve-month mark does, and the clock can be harder to manage than it looks once delays, change orders, and seasonal work are factored in.

Dependent agents. Even without any fixed place of business, an enterprise can have a PE through a person acting on its behalf. If a dependent agent has, and habitually exercises, the authority to conclude contracts in the name of the enterprise, the enterprise is deemed to have a PE in that country. By contrast, doing business through a genuinely independent agent — a broker or general commission agent acting in the ordinary course of its own business — does not, by itself, create a PE. The line between a dependent agent who binds the company and an independent intermediary is one of the most heavily litigated areas of treaty practice.

Preparatory and auxiliary activities. The treaty carves out activities that are merely preparatory or auxiliary — for example, using facilities solely to store, display, or deliver goods, or maintaining a fixed place of business solely to purchase goods or collect information. These exceptions are read narrowly, and an activity that is core to the business rather than genuinely ancillary will not qualify.

The services-PE rule: a trap that catches consultants and contractors

The most under-appreciated provision is the services permanent establishment rule in Article V(9), which can deem a PE to exist even where there is no fixed place of business at all. It applies in two situations. The first is where an individual is present in the other country for more than 183 days in any twelve-month period and, during that period, more than 50% of the gross active business revenues of the enterprise consist of income from services performed in that country by that individual. The second is where an enterprise provides services in the other country for an aggregate of 183 days or more in any twelve-month period with respect to the same or a connected project, for customers who are residents of that country or who maintain a PE there to which the services are provided.

This rule is what turns a long consulting engagement, a multi-phase installation, or a recurring on-site service contract into a permanent establishment even though the provider never rented an office or signed a lease. Day counting becomes critical, the definition of a "connected project" is broad, and businesses that staff a single client relationship over many months are exactly the ones that get caught. The exposure is not theoretical: once the threshold is met, the other country can tax the profits attributable to those services and the provider is into the full compliance regime.

How each country taxes a business once a PE exists

When a U.S. enterprise has a permanent establishment in Canada, it must file a Canadian corporate return (the T2) and pay Canadian tax on the business profits attributable to that PE. Even where the enterprise takes the position that the treaty exempts it because there is no PE, a non-resident corporation that carried on business in Canada is generally still expected to file a treaty-based T2 and attach Schedule 91 to disclose and support the exemption claim. Added to that is Regulation 105, which requires a 15% withholding on fees paid to a non-resident for services rendered in Canada; the Canada Revenue Agency can grant a treaty-based waiver in advance where the payee is not subject to Canadian tax, but absent a waiver the payer must withhold. Wages paid to non-resident employees who work in Canada raise a parallel Regulation 102 withholding issue.

On the U.S. side, a Canadian corporation that carries on a U.S. trade or business is taxed on its effectively connected income (ECI) and must file Form 1120-F. Where the corporation takes the position that the treaty modifies or eliminates U.S. tax — because it has no U.S. PE — it must disclose that treaty-based return position on Form 8833 under section 6114. Filing a so-called protective Form 1120-F matters even when the company believes it owes nothing: filing preserves the right to claim deductions and credits against ECI if the IRS later disagrees on the PE question, and failing to file Form 8833 to disclose a treaty position carries a separate penalty of US$10,000 per year, independent of any other consequence. For a deeper look at how the cross-border rules fit together, see our cross-border tax overview and our cross-border tax hub.

The U.S. branch profits tax and Article X

A Canadian corporation that operates in the United States through a branch rather than a subsidiary faces a second layer of U.S. tax. The branch profits tax under section 884 of the Internal Revenue Code imposes a 30% tax on the corporation's "dividend equivalent amount" — broadly, the effectively connected earnings and profits that are not reinvested in the U.S. branch — to approximate the second-level tax that would have applied if the business had been run through a U.S. subsidiary that paid dividends back to Canada. The treaty does not eliminate this tax, but it tames it: under the dividend article (Article X), the branch profits tax rate is capped at 5%, and the first C$500,000 of cumulative branch earnings is exempt. The practical lesson is that branch-versus-subsidiary is a structural decision with real tax consequences, and it should be made deliberately rather than backed into.

How the treaty allocates profits to a PE

Where a PE does exist, Article VII does not let the host country tax the enterprise's worldwide profits — only the profits attributable to the PE. The treaty directs that the PE be treated as if it were a distinct and separate enterprise dealing at arm's length with the rest of the company, so the profits assigned to it are those it would have earned as a stand-alone business performing the same functions. That principle pulls transfer-pricing analysis into the picture: the functions performed, assets used, and risks assumed by the PE drive how much profit it should report. Getting this allocation right protects against double taxation, because the home country gives relief by way of foreign tax credits only for tax properly imposed on PE profits under the treaty.

State and provincial tax: where the treaty stops

One of the costliest misunderstandings is assuming the federal treaty solves everything. It does not bind the U.S. states. A Canadian business can have no U.S. federal PE and still owe state income tax, franchise tax, or sales-tax collection obligations, because states set their own nexus rules and most do not consider themselves bound by the Canada-U.S. treaty. Federal protection under Public Law 86-272 — which shields a business whose only in-state activity is soliciting orders for tangible goods — is narrow, does not cover services or digital activity, and many states question whether it even applies to foreign sellers. Since the Supreme Court's 2018 decision in South Dakota v. Wayfair, states have aggressively asserted economic nexus, so the state map has to be analyzed separately from the treaty. The mirror image exists in Canada, where a PE can carry provincial tax consequences. State and provincial exposure is its own workstream, not a footnote.

Common traps that create an inadvertent PE

Several recurring patterns turn an unremarkable cross-border arrangement into a taxable presence. A sales employee or contractor who routinely negotiates and closes deals in the other country can become a dependent agent, even working from a home office or a car. A remote employee who relocates across the border and keeps working for the company can establish a fixed place of business at their residence. A construction or installation contract that slips past twelve months, often through delays no one planned, flips into a PE. A consulting or staffing relationship that runs a single client engagement past 183 days triggers the services-PE rule. Using a U.S. LLC or another hybrid entity can produce treaty and classification mismatches that compound the problem. And taking the comfortable view that "the treaty exempts us" without filing the protective return and treaty disclosure leaves the exemption unclaimed and the penalties live. These traps are avoidable, but usually only if the structure and the contracts are reviewed before the work starts.

How Barrett Tax Law approaches permanent-establishment questions

Cross-border business tax is about making two systems agree before a problem hardens into an assessment. We start by mapping the facts that drive the PE analysis — where people are, what they do, how long projects run, who has authority to bind the company, and how contracts are structured — and then test that against Article V of the treaty in both directions. From there we identify what each country can tax, where the treaty provides relief and where it stops (including the state and provincial layer), and what has to be filed to actually secure the exemption: the protective cross-border filings, treaty disclosures, and any withholding waivers. We coordinate with U.S. and Canadian accountants and the firm's own cross-border practice, led by Simone Barrett (admitted in Ontario and Florida), so the U.S. and Canadian positions line up rather than working against each other. Where a restructure makes sense — branch versus subsidiary, agency arrangements, or how an engagement is staffed — we plan it deliberately. If your business is selling, hiring, or operating across the border, you are welcome to book a free consultation through our cross-border tax page to talk through the PE risk before it crystallizes. Related reading includes our cross-border move tax checklist and a case study on cleaning up cross-border filings, and for representation if a tax authority is already asking questions, see U.S. IRS and Florida representation.

This page is general information, not legal advice. Cross-border tax outcomes depend on the specific facts and on the rules of both countries, and the figures, rates, and thresholds described here can change. Speak with a qualified advisor about your own circumstances before acting.