For US tax purposes, most Canadians are classified as 'nonresident aliens' (NRA) — a legal term that determines which US tax rules apply to you. Understanding your NRA status is essential for knowing what US tax forms to file, what withholding rates apply, and how the Canada-US Tax Treaty works in your favor.
What Is a Nonresident Alien?
A 'nonresident alien' (NRA) is a non-US person who does not meet either of the two IRS tests for resident alien status:
- Green card test: You are not a lawful permanent resident of the US
- Substantial presence test: You have not been present in the US for 183 days or more in the current year (with a lookback formula)
Most Canadians who live and work in Canada are NRAs. Cross-border workers who regularly commute to the US may be resident aliens under the substantial presence test — consult a US CPA if this applies to you.
NRA Tax Treatment: What Applies to Canadians
As an NRA, you pay US tax only on US-source income, in two categories:
- Fixed, determinable, annual, or periodic (FDAP) income: Dividends, royalties, interest — subject to withholding at source
- Effectively connected income (ECI): Income connected to a US business — taxed at regular US rates on net income
Most passive income (dividends, royalties from platforms) is FDAP. Rental income can be elected as ECI. The Canada-US Treaty modifies these rules significantly for Canadians.
Filing Obligations as a Canadian NRA
Not all Canadian NRAs must file US tax returns. Filing is required if:
- You have ECI (e.g., US rental income, US business operations)
- You have FDAP income not fully covered by withholding
- The Canada-US Treaty requires a return for a treaty claim (some treaty positions require a return)
An ITIN is the Tax ID on any required Form 1040-NR filing.
Substantial Presence Test: The Cross-Border Warning
Canadians who work in the US (not just visit) need to monitor their US days carefully. The substantial presence test counts US days in the current and prior two years. Exceeding the threshold makes you a US resident alien — with worldwide US tax obligations. If you are a Canadian cross-border worker, consult a US immigration attorney and CPA annually.
Frequently Asked Questions
Are Canadians considered nonresident aliens for US tax?
Most Canadians who live and work in Canada are nonresident aliens (NRAs) for US tax purposes. Cross-border workers may become resident aliens if they meet the substantial presence test (183+ days in the US).
What US tax forms do Canadian NRAs file?
Form 1040-NR (US Nonresident Alien Income Tax Return) is the primary return for NRAs with US income. W-8BEN certifies NRA status to US payers. Both require your ITIN.
Do Canadian NRAs pay US tax on Canadian income?
No. NRAs pay US tax only on US-source income. Canadian-earned income (from Canadian clients, Canadian real estate, Canadian dividends) is not subject to US tax for Canadian NRAs.
How long does it take to get an ITIN?
8–14 weeks from the IRS submission date. Apply through ITIN Plus for $99.
What is the substantial presence test?
A formula that counts US presence over 3 years: (Days in current year × 1) + (Days in year 1 ago × 1/3) + (Days in year 2 ago × 1/6). If the result is 183+, you are a US resident alien for tax. Canadians who regularly work in the US should monitor this carefully.