What Is Tax Nexus in Canada for Businesses?

Tax nexus in Canada for US businesses runs on three separate tracks, and a US company can trip one without triggering the others. Federal and provincial income tax attach when you have a permanent establishment in Canada. Branch profits tax and withholding tax on cross-border payments can apply on top of that, or on their own. GST/HST and provincial sales tax follow a different logic entirely and can hit you with no physical presence at all, once your Canadian sales cross C$30,000. Each track has its own trigger, its own registration, and its own filing calendar.

What Creates Canadian Income Tax Nexus

A US corporation owes Canadian federal income tax when it has a permanent establishment (PE) in Canada. The Income Tax Regulations define a PE as a fixed place of business, which covers offices, branches, factories, warehouses, mines, and similar locations.¹ A corporation that uses substantial machinery or equipment at a particular location is also deemed to have a PE there.

People trigger PE status too. If your company operates through an employee or agent in Canada who has authority to sign contracts on your behalf, or who regularly fills orders from a stock of your goods, that person’s activities create a PE.¹ An independent contractor acting in the ordinary course of their own business generally does not.

Once a PE exists, the corporation’s Canadian-source business income faces federal tax at a net rate of 15% after the federal tax abatement and general tax reduction.² Provincial tax stacks on top of that federal layer.

How the Canada-US Tax Treaty Narrows the PE Rules

The Canada-US Tax Treaty overrides the domestic PE definition in ways that generally benefit US corporations, and activities that would create a PE under domestic law often will not for a US-resident company.

The most important carve-out is for preparatory and auxiliary activities. A fixed place used solely for storing, displaying, or delivering your goods does not create a PE. The same applies to maintaining inventory for processing by another person, purchasing goods, collecting information, and advertising or research that is preparatory or auxiliary.³ A US company that keeps a Canadian warehouse purely for logistics generally should not have income tax nexus from that warehouse alone.

Construction has a specific timing rule: a building site or installation project constitutes a PE only if it lasts more than 12 months.³ Short-term contracts stay outside the PE net. Drilling rigs and exploration equipment face a shorter three-month threshold within any twelve-month period.

Having a Canadian subsidiary does not by itself make the US parent a PE, and using an independent broker or commission agent in the ordinary course of their own business does not either.³

The Provincial Layer

Provincial income tax stacks on top of the federal rate. Combined rates for a US corporation with a Canadian PE range from roughly 23% in Alberta to 31% in provinces like Prince Edward Island, depending on the province and the type of income.² Where your PE sits has real financial weight.

When a corporation has PEs in more than one province, taxable income is split using a two-factor formula. Each province’s share is the average of two proportions: gross revenue reasonably attributable to that province, and salaries and wages paid to employees at the PE there.⁴ If gross revenue is zero, the allocation defaults to the salary-and-wages factor alone, and vice versa. Revenue is generally attributed to the province where goods are delivered or services performed; salaries to the province where the employee primarily reports for work.

Most provinces have the CRA administer their corporate income tax, so one T2 return handles both. Quebec and Alberta run their own corporate tax systems, so a PE in either means a separate return with Revenu Québec or Alberta Tax and Revenue Administration on top of the federal T2.⁵

Branch Profits Tax on Top

Canada imposes a branch profits tax under Part XIV of the Income Tax Act, designed to approximate the withholding that would apply if the Canadian operation were a subsidiary paying dividends to its US parent. The statutory rate is 25% of after-tax Canadian earnings, after subtracting federal and provincial income taxes already paid and certain allowable reinvestments in Canadian assets.⁶

The treaty cuts this substantially. The branch profits tax rate for US corporations tracks the rate on direct investment dividends, reduced to 5%.³ The treaty also provides a cumulative exemption for the first C$500,000 of undistributed branch profits, which can eliminate the tax entirely for smaller operations. Non-resident corporations calculate it on Schedule 20, filed with the T2.⁷

Withholding Tax Without a PE

Even with no PE, a US corporation can face Canadian tax through Part XIII withholding. When a Canadian payer sends certain amounts to a non-resident — dividends, interest, royalties, management fees, or rent — it must withhold 25% and remit to the CRA.⁸ That is the default. The treaty lowers it for US recipients:

Dividends: 5% when the US corporate shareholder owns at least 10% of the voting stock of the Canadian payer; 15% for portfolio dividends below that ownership threshold.
Interest: generally 10%, though arm’s-length interest and government-backed interest are often fully exempt.
Royalties: most royalties, including software royalties, are exempt from withholding entirely. Other categories face a maximum 10% rate.

To claim the treaty rate, the Canadian payer needs a completed NR301 form (or equivalent) from the US recipient certifying treaty eligibility. Without that certification, the payer withholds the full 25%.⁸

GST/HST Nexus Runs on Sales, Not Presence

Sales tax nexus works on a different axis. It looks at where you supply goods or services, not whether you have a fixed place of business. The federal Goods and Services Tax (GST) is 5%. Several provinces combine it with their provincial portion into a single Harmonized Sales Tax (HST); Ontario’s rate, for example, is 13%.⁹

A US corporation must register for GST/HST once it exceeds C$30,000 in taxable supplies in Canada over four consecutive calendar quarters, or in a single quarter. Physical presence is not required. Crossing the revenue threshold is what triggers the obligation.¹⁰

Digital Products Have Their Own Regime

Since July 2021, non-resident vendors selling digital products, streaming services, or software to Canadian consumers register under a dedicated framework. If your revenue from these digital supplies to Canadian consumers exceeds C$30,000 over any 12-month period, you register under the Simplified GST/HST regime, regardless of any physical presence.¹¹

Simplified registration means lighter reporting and no fiscal representative requirement, but vendors registered this way cannot claim input tax credits for GST/HST paid on their own Canadian expenses.¹² If your Canadian input costs are meaningful, standard GST/HST registration may be worth the extra compliance because it lets you recover that tax.

Provincial Sales Tax Is Separate Again

British Columbia, Saskatchewan, and Manitoba each levy their own Provincial Sales Tax (PST) alongside GST, at 7%, 6%, and 7% respectively. Quebec administers its own Quebec Sales Tax (QST) through Revenu Québec. PST nexus is triggered by province-specific activities. In British Columbia, soliciting sales, delivering goods, or storing inventory in the province all require PST registration. Saskatchewan and Manitoba have similar rules tied to accepting orders from customers there or maintaining any presence for sales purposes.

A US company shipping physical goods directly to a customer in Vancouver has to register for and collect BC PST, even with no office or employees in the province. Each province has its own registration process, forms, and filing deadlines. There is no single national registration that covers PST obligations.

Related-Party Transactions and Transfer Pricing

Any US corporation transacting with a related Canadian entity, whether selling goods, licensing intellectual property, or charging management fees, must price those transactions as if the parties were dealing at arm’s length. Section 247 of the Income Tax Act gives the CRA authority to adjust amounts reported on a return if the terms of a related-party transaction differ from what unrelated parties would have agreed to.¹³

The CRA can also recharacterize a transaction entirely if unrelated parties would not have entered into it and it lacks a genuine business purpose beyond obtaining a tax benefit. A 10% penalty applies when the net transfer pricing adjustment exceeds C$5 million or a specified percentage threshold. Contemporaneous transfer pricing documentation is the primary defense.

What Compliance Looks Like Once Nexus Exists

The first administrative step is obtaining a Business Number (BN) from the CRA. This nine-digit identifier is required for all federal and provincial tax program interactions, including income tax and GST/HST accounts.¹⁴ Registering for specific programs like GST/HST or payroll appends a program identifier and reference number to the existing BN.¹⁵

Non-resident corporations with a PE file a T2 Corporation Income Tax Return within six months of the end of each tax year.¹⁶ Non-resident corporations are currently exempt from mandatory electronic filing of the T2, though paper filing still has to hit the deadline.¹⁷ Missing that deadline triggers a 5% penalty on unpaid tax plus 1% per complete month late, up to 12 months.¹⁸

Corporations generally make monthly installment payments toward their income tax liability during the year rather than paying everything at filing time.¹⁹ Interest accrues on missed or underpaid installments. GST/HST returns are filed quarterly or annually depending on sales volume, and QST and PST returns go to the respective provincial authorities on their own schedules.

Supporting documentation for Canadian transactions — invoices, contracts, payroll records, allocation calculations — must be kept at a place of business or residence in Canada unless the CRA grants written permission to store them elsewhere. The retention period is generally six years from the end of the last tax year the records relate to.²⁰ This catches US companies used to centralizing records at their US headquarters.

What Nexus Triggers Back on the US Side

Establishing Canadian nexus creates work on the American side too. Canadian income taxes, branch taxes, and withholding taxes paid can generally be credited against US federal income tax on the same income through the foreign tax credit. US corporations claim it on Form 1118, which requires separating foreign-source income into categories and computing limitation fractions for each.²¹

If your corporation maintains Canadian bank accounts for payroll, receiving customer payments, or any other purpose, and the aggregate balance across all foreign financial accounts exceeds US$10,000 at any point during the calendar year, you must file a Report of Foreign Bank and Financial Accounts (FBAR) with FinCEN.²² The FBAR is due April 15 following the calendar year, with an automatic extension to October 15 that requires no request.²³ Willful non-filing penalties are severe, and the FBAR gets overlooked because the threshold is low and the form sits outside the regular tax return.

1
Canada Revenue Agency. Permanent Establishment
2
Canada Revenue Agency. Corporation Tax Rates
3
Government of Canada. Convention Between Canada and the United States of America
4
Justice Laws Website. Income Tax Regulations CRC c 945 – Section 402
5
Canada Revenue Agency. Provincial and Territorial Corporation Tax
6
Justice Laws Website. Income Tax Act RSC 1985 c 1 5th Supp – Section 219
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Canada Revenue Agency. Income Tax Information for Non-Resident Corporations
8
Canada Revenue Agency. Applicable Rate of Part XIII Tax on Amounts Paid or Credited to Persons in Countries Which Canada Has a Tax Convention
9
Canada Revenue Agency. Charge and Collect the GST/HST
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Canada Revenue Agency. When to Register for and Start Charging the GST/HST
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Canada Revenue Agency. Cross-Border Digital Products and Services Threshold Amounts
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Canada Revenue Agency. GST/HST for Digital-Economy Businesses: Overview
13
Justice Laws Website. Income Tax Act RSC 1985 c 1 5th Supp – Section 247
14
Canada Revenue Agency. Business Number and CRA Program Accounts
15
Canada Revenue Agency. When You Need a Business Number
16
Canada Revenue Agency. When to File Your Corporation Income Tax Return
17
Canada Revenue Agency. Completing Your Corporation Income Tax T2 Return
18
Canada Revenue Agency. Avoiding Penalties
19
Canada Revenue Agency. Corporation Instalment Guide 2025
20
Canada Revenue Agency. Where to Keep Your Records, for How Long and How to Request the Permission to Destroy Them Early
21
Internal Revenue Service. About Form 1118, Foreign Tax Credit – Corporations
22
FinCEN.gov. Report Foreign Bank and Financial Accounts
23
Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR)