Cross-Border Remote Work US Canada: Tax, Payroll and Treaty Rules

Cross-border remote work US Canada arrangements look simple from a laptop but are not simple on paper. Where you live decides which country taxes you as a resident, where your body sits when you work decides which country has a claim on the wages, and your employer's location decides who has to withhold and register. This guide covers the four common set-ups: a Canadian resident working from home for a U.S. employer, a U.S. resident working for a Canadian employer, short work trips across the border, and cross-border contractors. It is written for employees in places like Toronto, Naperville, Calgary and Aurora, and for the employers who pay them.

Cross-border remote work US Canada: who taxes the paycheque?

Use three questions in order. First, where does the employee live? That fixes residency for each country under its own law and, if needed, the treaty tie-breaker (see the US Canada tax treaty guide). Second, where is the work physically done on each day? Third, who is the employer, and does it have a presence (an office, a payroll account, or a permanent establishment) in the work country?

What does the treaty say about working across the border?

The 2007 protocol rewrote Article XV. A resident of one country who works in the other can be taxed there, unless (a) the remuneration for work done in that country in the calendar year does not exceed $10,000 in that country's currency, or (b) the person is present no more than 183 days in any 12-month period beginning or ending in the year, the pay is not paid by or on behalf of a resident of the work country, and it is not borne by a permanent establishment there. Test (b) fails automatically when a U.S.-resident employer pays a Canadian resident for days in the United States, which is why the $10,000 test often carries the day. The rewrite also removed the old article on independent services; self-employed people now fall under the business profits article, with a services permanent establishment test at 183 days.

What does the Canadian employer side look like?

The CRA says employers must deduct income tax from non-resident employees in regular and continuous employment in Canada whether or not the employer is Canadian, and a treaty may reduce what is withheld. A non-resident employee can request a waiver, and a certified non-resident employer can skip withholding for qualifying employees: those resident in a treaty country, treaty-exempt, and working in Canada fewer than 45 days or present fewer than 90 days in any 12-month period. The employer applies on Form RC473 at least 30 days before the employee starts, for up to two calendar years. For an employee of an employer with no Canadian establishment, the CRA says payroll uses federal rules, since the work is in Canada but beyond any province.

CPP is different. The CRA says an employer outside Canada without a Canadian place of business may extend CPP coverage to employees in Canada by filing Form CPT13, and the agreement with the United States can override domestic rules. Canadian payroll advice is a job for your Canadian CPA or payroll provider. The hiring foreign workers guide covers it in more depth.

What does the U.S. employer side look like?

A U.S. company with an employee working from Canada pays no U.S. social security tax on that work when the agreement assigns coverage to Canada. A Canadian company with an employee in Illinois generally needs to register for payroll and unemployment insurance there; see Illinois payroll withholding and the employer compliance checklist. An employee working in a second state has its own rules, covered in multistate residency and nexus.

How to set up a cross-border remote work arrangement step by step

1. Write down the facts: residence, work location by day, who pays, and the length of the arrangement.
2. Determine tax residency in both countries and apply the tie-breaker if needed.
3. Apply Article XV to any days worked in the other country.
4. Fix payroll: register or confirm the registrations, tax tables and forms in the country of work.
5. Settle social security with the right certificate of coverage if the worker is posted rather than hired locally; see totalization.
6. Check employer-level risks: permanent establishment, corporate filings, and sales tax or GST/HST on the business.
7. Document and review each year, because a promotion or a move changes the answer.

Documents to keep

• A day log with the country of work for each day
• Employment contract and any remote-work agreement
• Pay records showing pay by period
• Residence documents (lease, deed, provincial health card, driver's licence)
• Certificate of coverage, Form RC473 approval, or waiver letters

Deadlines and penalties

Ask for a certificate of coverage before the work starts. Apply for Form RC473 at least 30 days before a qualifying employee begins work in Canada. Annual filings follow the usual calendar: the Canadian T1 was due April 30, 2026 for 2025 and the U.S. Form 1040 April 15, 2026, with an automatic two-month extension for people living abroad. The CRA warns that if a certified employee stops qualifying, or certification is revoked, the employer may owe the withholdings, interest and penalties for the whole period.

Worked example

Priya lives in Mississauga and works full time from home for a Naperville software company with no Canadian entity. Her salary is $110,000. Because she performs the work in Canada, Canada taxes her as a resident, and the CRA expects the employer to withhold and remit Canadian payroll deductions unless a waiver applies. She also travels to Aurora for 20 working days of meetings. On a 260-day work year, those days equal about $8,462 of pay, below the $10,000 limit, so Article XV leaves the pay taxable only in Canada. If she spent 30 days in Illinois, the pay for them would be about $12,692, above the limit, and because the employer is a U.S. resident the 183-day test does not rescue her; that pay is taxable in the United States and Canada gives a credit. These figures are hypothetical.

Mistakes to avoid

• Assuming a foreign employer has no Canadian withholding duty because it has no office.
• Counting only calendar-year days for the 183-day test, or ignoring the $10,000 test.
• Assuming a tax answer settles whether you are allowed to work while visiting; that is an immigration question.
• Forgetting state or provincial income tax and payroll registration.
• Letting a short arrangement turn into a permanent establishment for the employer.

How we can help

We are a U.S. CPA firm in the Aurora, Illinois area. We advise on the U.S. side of remote and hybrid arrangements: treaty positions, U.S. payroll for foreign employers, employee returns, and foreign tax credits, and we coordinate with your Canadian CPA or payroll adviser on Canadian withholding and CPP. See payroll and employer compliance and cross-border tax services. Back to the cross-border hub.

Frequently asked questions

General information only. It is not tax, legal, accounting or immigration advice for your situation, and rules change; confirm the current rules with the official source or a licensed professional in the relevant country.