Picture it: you’re on a video call from a Waterloo basement, your manager is logging in from Austin, and your pay comes out of a payroll office in New York. Across Toronto, Ottawa and Waterloo, lots of people work exactly like this. Day to day it feels like a local job. But the money crosses a border on its way to you. Good news if you work remotely for a US company from Canada: the taxes are rarely as bad as people fear. Get a handful of details right early on and most of the risk goes away.
This piece walks through who gets to tax your pay, the classic withholding mix-up, CPP and benefits, and the twists that come with business travel or contractor status.
The Basic Rule: Where You Work Matters
Live in Canada and you’re taxed in Canada on everything you earn, worldwide. Employment income is generally treated as coming from wherever you physically do the work. Your desk is in Ontario, you live in Ontario: that makes the income Canadian-source, and Canada has the right to tax it.
And the IRS? It generally leaves alone the wages of a non-resident alien for work performed outside the country. In plain terms, a Canadian resident who has neither U.S. citizenship nor a green card, and who never works from U.S. soil, usually pays no U.S. income tax on that salary. The employer being American doesn’t change that.
U.S. citizens are different. Moving north didn’t end their U.S. filing duty. In practice, though, Canadian tax paid generates foreign tax credits big enough that the U.S. bill usually ends up at zero.
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What Often Goes Wrong: U.S. Withholding
Out of the box, an American payroll system takes off U.S. federal income tax, Social Security and Medicare. Nobody tells it you’re in Canada? Then you can have tax you never owed deducted from every single pay. To get it back you file a U.S. return and wait for a refund, and in the meantime Canada still expects its tax.
Head this off on day one. Send payroll an email on your first day explaining you’re a non-resident working from Canada, and hand over whatever documentation they ask for. Already had U.S. tax taken off by mistake? Keep every pay record and talk to someone about getting it back.
Canadian Tax When Your Employer Doesn’t Run Canadian Payroll
Some U.S. employers register with the CRA and run Canadian payroll, taking off Canadian income tax, CPP and EI just like a Canadian employer would. Others go through an employer-of-record service that handles it. And some just pay you in U.S. dollars with nothing deducted at all.
If you’re in that third group:
- No income tax is withheld, which means a big balance is likely when you file. Once net tax owing goes over $3,000, the CRA will want quarterly instalments in later years.
- CPP may not be deducted. Depending on your situation, you may be able to elect to pay CPP on that employment income using Form CPT20. That keeps your future pension on track.
- EI coverage may not apply, and that matters if you’re laid off down the road or go on parental leave.
So ask early how they plan to pay you. The answer affects your cash flow, your benefits and how much you should be putting aside.
Business Trips to the U.S.
Days you actually work in the U.S. are a different matter. Pay for work done on U.S. soil is U.S.-source. The Canada–U.S. tax treaty exempts it from U.S. tax only in limited cases, for instance when your U.S. employment income for the year is US$10,000 or less. And because your employer is a U.S. resident, the treaty’s separate 183-day exemption generally won’t help.
A couple of short trips may stay under the limit. Regular quarterly visits, or a month at head office, could mean a U.S. filing requirement. If you do pay U.S. tax, you claim a foreign tax credit in Canada so the same income isn’t taxed twice. A simple log of U.S. workdays makes all of this much easier to sort out.
Employee or Contractor?
Some U.S. companies would rather take on Canadians as independent contractors than set up Canadian payroll. If that’s how you’re paid, Canada sees you as self-employed:
- Business income goes on Form T2125.
- You pay both halves of CPP, the employee share and the employer share.
- Reasonable business expenses are deductible, a portion of home office costs for example.
- Cross $30,000 in revenue and GST/HST registration is on the table. Yes, services to non-resident businesses are often zero-rated. You still need to sort out the registration question.
Calling yourself a contractor in the agreement doesn’t settle anything. What the CRA cares about is how things actually work day to day. Who’s directing the work? Whose equipment is it? Who stands to lose money? Set hours, a manager telling you what to do, a company laptop? You may be an employee in substance.
Stock Options and RSUs
Work for a U.S. tech company and there’s a good chance part of your pay arrives as equity. This is the fiddly bit. RSUs and options are generally employment income in Canada at vesting or exercise, and the CRA uses its own rules to decide that, regardless of how the U.S. plan documents describe things. Worked some of the vesting period in the U.S.? Then some of the benefit could count as U.S.-source too. Write down dates, values and exchange rates as each grant vests.
Currency and Record-Keeping
Everything goes on the return in Canadian dollars. Use the Bank of Canada rate for each pay date, or an annual average where the CRA permits it. Hang on to pay stubs and any U.S. tax forms that show up, and keep a count of days worked in each country. With good records, what could be a messy return becomes a routine one.
Contractor status, equity compensation, regular trips south: if any of those apply, it’s worth having a cross border tax accountant in Toronto or your local area look over the setup before your first tax season, not after it.
Conclusion
Bottom line for most Ontarians working from home for an American employer: Canada taxes the income, the U.S. doesn’t. What trips people up is mechanical. U.S. tax deducted when it shouldn’t be. Nothing deducted for Canada. CPP forgotten. A few too many days in the U.S. and suddenly there’s a filing requirement. One conversation with your employer, a decision on instalments and a travel log will take care of most of it.
Frequently Asked Questions
Do I pay U.S. tax if I work for a U.S. company from Canada?
Usually not. If you aren’t a U.S. citizen or green card holder and every bit of the work happens in Canada, the U.S. generally doesn’t tax it. Canada taxes that income.
My U.S. employer withheld U.S. tax. What should I do?
Two steps. File a U.S. return to claw back the tax you didn’t owe, and get the employer to correct payroll going forward.
Do I need to pay CPP if my employer doesn’t deduct it?
Sometimes you can elect to contribute to CPP on that employment income. It’s worth thinking about, since CPP contributions build your future pension.
What if I travel to the U.S. for work?
Whatever you earn for days spent working in the U.S. is U.S.-source income, and depending on the amount, the U.S. may tax it. A foreign tax credit in Canada stops it being taxed twice.
Am I an employee or a contractor?
The label on the contract matters less than how you actually work. Control, tools, risk and how integrated you are into the business all count.
