Remote Work Across the Canada-US Border: Tax Rules

Remote work does not change the fundamental tax rule for employment income: it is taxed where the services are performed, not where the employer is located or where the paycheck originates. A Canadian employee who works remotely from their home in Florida for a Toronto-based employer is performing services in the US. The US taxes that income. A US citizen who works remotely from Vancouver for a San Francisco company is performing services in Canada. Canada taxes that income. The employer’s location matters for payroll tax obligations and withholding, but the taxing jurisdiction follows the worker’s physical location. When the border sits between the worker and the employer, both countries get involved, and the treaty, the FTC, and the payroll rules all need to work together.

What happens when a Canadian works remotely from the US?

A Canadian resident who works from a US location (home, co-working space, a family member’s house) for a Canadian employer is performing services in the US. The tax consequences:

US tax obligation. The income attributable to days worked in the US is US-source employment income. If the Canadian is not a US citizen or green card holder, they are a non-resident alien for US tax purposes. Non-resident aliens are taxed on US-source income, including employment income from services performed in the US.

Short-stay exception. Article XV(2) of the Canada-US tax treaty provides an exception: employment income is taxable only in the country of residence (Canada) if all three conditions are met:

• Present in the US for no more than 183 days in any 12-month period
• Remuneration is paid by an employer who is not a US resident
• Remuneration is not borne by a permanent establishment the employer has in the US

If all three conditions are met, the income is not taxed in the US. The employee does not need to file a US return for that income. This exception is designed for short business trips and temporary assignments, not for permanent remote-work arrangements.

When the exception fails. If the Canadian works from the US for more than 183 days, or the Canadian employer has a PE in the US, the exception does not apply. The US taxes the income attributable to US days, and the employee needs a US tax identification number (ITIN or SSN) and must file Form 1040-NR.

Canadian tax. Canada continues to tax the employee’s worldwide income as a Canadian resident. The FTC under ITA 126(1) credits the US tax against the Canadian tax on the same income.

What happens when a US person works remotely from Canada?

A US citizen or green card holder who works from Canada for a US employer is performing services in Canada. The tax consequences depend on whether the person is a Canadian resident for tax purposes.

If the US person becomes a Canadian resident. Establishing sufficient residential ties to Canada (renting or buying a home, having a spouse in Canada, enrolling children in school) makes the person a Canadian resident under ITA 250. Canada taxes the worldwide income. The employment income from working in Canada is Canadian-source income. The US also taxes the worldwide income (because of citizenship). The FTC on Form 1116 credits the Canadian tax against the US tax.

If the US person does not become a Canadian resident. A US citizen who works from Canada temporarily (less than 183 days, no residential ties) may not be a Canadian resident. Canada can still tax the employment income attributable to services performed in Canada, but the short-stay exception in Article XV(2) may apply if the employer is not a Canadian resident and does not have a Canadian PE. If the exception applies, only the US taxes the income.

US employer obligations. A US employer with an employee working in Canada may need to register for Canadian payroll, withhold Canadian income tax, and remit CPP and EI contributions. The threshold is fact-dependent: if the employee works in Canada regularly and the employer has direction and control over the work, the CRA can deem the employer to be carrying on business in Canada, triggering payroll obligations.

What is the permanent establishment risk?

An employer’s biggest cross-border remote work risk is the permanent establishment. Under Article V of the Canada-US tax treaty, a PE is a fixed place of business through which the enterprise carries on its business. An employee’s home office can constitute a PE if the employee has the authority to conclude contracts on behalf of the employer, or if the home office is at the disposal of the employer.

When a home office becomes a PE:

• The employee regularly concludes contracts or takes orders that bind the employer
• The employer requires the employee to work from that location (not the employee’s personal choice)
• The office is the employer’s only presence in the country
• The work performed is core business activity, not preparatory or auxiliary

When it does not:

• The employee works from home by personal choice, and the employer has no requirement for a local presence
• The work is preparatory or auxiliary (administrative support, research, quality control)
• The employee does not have authority to bind the employer in contracts

If a PE is created, the employer must file a corporate tax return in the source country, report the profits attributable to the PE, and pay corporate income tax on those profits. This is a significant compliance burden and can be expensive.

How does payroll work across the border?

Payroll obligations follow the location where the work is performed, not where the employer is incorporated.

Canadian employer with a US-based remote worker:

• Must register for US federal payroll (EIN), withhold US federal income tax, Social Security, and Medicare
• Must register for state payroll tax in the employee’s state (withholding, unemployment insurance)
• The totalization agreement may exempt the employee from US Social Security/Medicare if the employee remains covered under the Canadian system (temporary assignment expected to last 5 years or less)
• Without a totalization certificate, the employee pays into both systems

US employer with a Canadian-based remote worker:

• Must register with the CRA for payroll (open a payroll account), withhold Canadian income tax, and remit CPP and EI contributions
• The totalization agreement may exempt the employee from CPP if the employee remains covered under the US system (temporary assignment)
• Without a totalization certificate, the employee pays into both systems

Many employers use employer-of-record (EOR) services to handle cross-border payroll without setting up their own entities in the other country. The EOR becomes the legal employer in the source country, handles withholding and remittances, and invoices the actual employer.

What about state and provincial taxes?

State and provincial taxes add a layer of complexity:

• US states. Most US states with an income tax require withholding on income earned in that state, regardless of where the employer is located. A Canadian employee working remotely from New York owes New York state income tax on the income earned there. Some states (Connecticut, New York, Pennsylvania, Nebraska, Delaware) have “convenience of the employer” rules that tax remote workers based on where the employer is located, not where the employee works, which can create double taxation with the employee’s home state.
• Canadian provinces. Provincial tax is based on the province of residence on December 31. A remote worker living in British Columbia pays BC provincial tax even if the employer is in Ontario. There is no province-to-province withholding issue because provincial tax is administered federally.

What are the practical compliance steps?

For an employee working remotely across the border:

1. Determine your tax residency. Are you a resident of Canada, the US, or both? This determines which country taxes your worldwide income and which gives the credit.
2. Count your days. Track the number of days you physically work in each country. The day count determines the income allocation and whether the short-stay exception applies.
3. Check the employer’s obligations. Does the employer need to register for payroll in the other country? Are they withholding correctly?
4. File in both countries. If you owe tax in both countries (or even if you don’t because the FTC eliminates the liability), you may need to file in both countries to claim the credit and demonstrate compliance.
5. Claim the FTC. The home country gives a credit for the tax paid to the source country. This eliminates double taxation but requires proper documentation of the foreign tax paid.

What should I do next?

Remote work across the border creates tax obligations that many employees and employers do not anticipate. The consequences range from individual tax filing in both countries to corporate PE risk for the employer. The earlier you address the structure, the fewer surprises at tax time.

• The US-Canada tax treaty explained, Article XV on employment income
• Substantial presence test, the US day-count test for tax residency
• Closer connection exception and Form 8840, how to avoid US residency on a day-count basis
• Self-employed cross-border, if you are a contractor rather than an employee
• Treaty tiebreaker rules, resolving dual residency
• Self-employment tax: CPP vs FICA, the payroll side if you are self-employed rather than employed
• Canadian commuter: Windsor-Detroit, a specific cross-border work corridor
• Digital nomad tax, the rules for freelancers and nomads who split time between countries
• Home office deduction cross-border, claiming the deduction when your office is in one country and your employer is in the other

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.