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If you’re a US citizen living in Canada, you file in both countries. The IRS says US citizens abroad have worldwide income taxed by the US and follow the same filing rules as people living there. A US Canada tax accountant is one who can prepare both returns and match them up.
Why would you need a US Canada tax accountant?
Because the two returns feed each other, and a number that’s right on one can be wrong on the other if nobody compares them. Canada taxes residents on worldwide income. The US taxes its citizens and resident aliens on worldwide income too. To stop the same dollar being taxed twice, Canada offers a foreign tax credit on Form T2209, and the Canada and US tax treaty adds its own rules. Getting that credit right is most of the work.
You may also be here as a Canadian with a US job, a US rental, or a cross-border move. Then your question is different. Which country treats you as a resident? Residency comes first.
Everything else follows from it, including which country gets the first claim on each kind of income, which slips you need to gather, and how the treaty applies if both countries claim you as a resident.
What does a cross-border filer have to watch?
| Item | Rule confirmed |
|---|---|
| US filing from Canada | Same requirements as living in the US, worldwide income |
| US due date, calendar year | April 15, with an automatic extension to June 15 for those abroad |
| Interest on unpaid US tax | Runs from the regular due date, even with the extension |
| Canadian foreign property form T1135 | Needed when specified foreign property cost tops $100,000 |
| T1135 simplified reporting | Part A, under $250,000 throughout the year |
| T1135 detailed reporting | Part B, $250,000 or more at any time |
| Foreign tax credit on the Canadian return | Form T2209 |
The extension needs a statement attached to your US return saying why you qualify. And it delays the filing, not the interest. If you owe US tax, the clock runs from April 15.
On the Canadian side, the CRA’s T1135 page says the form applies when specified foreign property cost more than $100,000 at any time in the year, and that personal-use property such as a cottage you only use yourself isn’t counted. Cost, not market value, is what matters.
What does the Canadian side look like in numbers?
Take $85,000 of employment income in Ontario. The income tax calculator shows $10,226.60 of federal tax and $5,324.46 of Ontario tax, so $15,551.05 in all, plus $5,769.52 of CPP and EI. Income tax alone is 18.3% of income before any foreign credit.
If part of the income was taxed in the US, the foreign credit can reduce the Canadian amount. The calculator doesn’t model that credit, so it can’t run it for you. Ask your accountant to show the credit line by line, in both currencies.
Deductions change the picture as well. The tax credits calculator shows how an RRSP or other deduction cuts the bill on the Canadian side, though it uses federal credits only. Whether a Canadian deduction helps on the US return is a question for the accountant, and the answer for any specific plan wasn’t confirmed here.
Self-employed? Try the self-employed tax calculator for a Canadian view. It counts both halves of CPP but leaves out EI.
How do you pick someone without a directory?
A search for a firm near you will turn up plenty of names. None of them has been checked for this page, and it won’t point you to one. Here’s what to do instead.
Ask whether they prepare both the T1 and the US return themselves or hand one off, and who signs each. How do they handle foreign accounts and the T1135? You want the price and what’s extra in writing. And what happens if a return is questioned in either country?
Check any credential with the body that issues it.
Then ask for a first call about your case before you send documents. Someone good will ask about your citizenship, residency dates, accounts and income sources before quoting.
What if you’ve missed US returns in the past?
It happens more than people admit. Say Mark moved from Buffalo to Kitchener a few years ago and assumed that crossing the border ended his US filing. If you’re in that spot, don’t file anything in a panic. Gather what you have, then ask an accountant who does cross-border work what your options are and what the rule is for each. The IRS has its own procedures, and I haven’t verified them, so ask for the rule and its source in writing.
What goes wrong most often?
People miss the US return because they assume Canadian residence ends the duty. It doesn’t, for a citizen. Others forget the T1135 when the US brokerage account crosses $100,000 of cost. Some file two returns that show the same income in different ways.
Start gathering slips early. You need Canadian slips, US slips, dates of any move, and the exchange rates your accountant will use. Fees, IRS penalties and treaty positions for special cases like retirement plans weren’t confirmed for this page, so ask for the rule and its source.
Where do these figures come from?
Tax figures are from the Canada Revenue Agency and the 2026 Ontario and federal tables in our calculator. US filing rules and the extension come from the Internal Revenue Service page for citizens and resident aliens abroad. The T1135 limits and foreign tax credit form come from Canada.ca. This site isn’t affiliated with the CRA, the IRS or any government.
Frequently asked questions
Do US citizens in Canada file a US return?
Yes. The IRS says US citizens abroad are taxed on worldwide income and follow the same filing rules as people living in the US.
Is there an automatic extension for people abroad?
For a calendar year, the US due date is April 15 and the automatic extension runs to June 15. You attach a statement, and interest still runs on unpaid tax from April 15.
When do I file a T1135?
When the cost of your specified foreign property tops $100,000 at any time in the year. Under $250,000 you can use simplified reporting.
How does Canada avoid double tax on US income?
Through a foreign tax credit, claimed on Form T2209, and through the Canada and US tax treaty.
Can you recommend an accountant near me?
No. We haven't checked any firm, so we give questions to ask instead.