The IRS and the CRA are the federal tax authorities of the United States and Canada, and the core difference between them is who they claim: the IRS taxes US citizens and Green Card holders on worldwide income no matter where they live, while the Canada Revenue Agency taxes people based on their residential ties to Canada. If your life crosses the border in any meaningful way, that distinction is where your filing obligations begin, because you can easily owe returns to both agencies for the same year under two different sets of rules.
The CRA administers federal tax law and, for every province except Quebec, collects provincial income tax on the same return. The individual return is the T1 Income Tax and Benefit Return. Quebec runs its own provincial system and requires a separate provincial filing.1Canada Revenue Agency. Provincial and Territorial Tax and Credits for Individuals The IRS, by contrast, handles only federal tax; state income taxes are collected separately by each state.
Who Each Agency Claims as a Taxpayer
The two countries use fundamentally different tests to decide whether you owe them a return, and the overlap between the tests is where cross-border filing gets complicated.
The IRS: Citizenship and Substantial Presence
The United States taxes based on citizenship. Every US citizen and Green Card holder must file a federal return reporting worldwide income, regardless of where they live.2Internal Revenue Service. U.S. Citizens and Resident Aliens Abroad A US citizen living full-time in Toronto still owes the IRS a return every year.
For non-citizens without a Green Card, the IRS uses the Substantial Presence Test. You meet it if you were physically in the US for at least 31 days in the current year and a weighted total of at least 183 days over three years, counting all days in the current year, one-third of the prior year’s days, and one-sixth of the days from two years back.3Internal Revenue Service. Substantial Presence Test Passing that test makes you a US resident alien, taxable on worldwide income.
The CRA: Factual and Deemed Residency
Canada looks at your real-world connections rather than your citizenship. Significant residential ties include a home available to you in Canada, a spouse or common-law partner in Canada, or dependents living there. Secondary ties (Canadian bank accounts, a driver’s license, a provincial health card) reinforce the determination. Factual residents owe Canadian tax on worldwide income.
Even without those ties, you can be a “deemed resident” if you spend 183 days or more in Canada during the calendar year and are not considered a resident of another country under a tax treaty.4Canada Revenue Agency. Deemed Residents of Canada Deemed residents face the same worldwide reporting obligation as factual residents.
When Both Countries Claim You
It is easy to qualify under both sets of rules at once, and when that happens the US-Canada tax treaty resolves the conflict through a sequential test. First: where do you have a permanent home available? If both, where is your center of vital interests (personal and economic relationships)? If that is inconclusive, where is your habitual abode? If both or neither, citizenship decides. If you hold both citizenships or neither, the two governments settle it by mutual agreement.5Internal Revenue Service. Treasury Department Technical Explanation of the Convention
One trap: some US states do not honor federal treaty provisions. State-sourced income can still be taxed by the state regardless of what the treaty says about your country of residence.6Internal Revenue Service. United States Income Tax Treaties – A to Z
Filing Deadlines for 2026
The two agencies do not line up on dates. For the 2025 tax year, the CRA deadline for most individuals is April 30, 2026. Self-employed filers and their spouses or common-law partners have until June 15, 2026 to file, but any balance owing is still due April 30.7Canada Revenue Agency. What You Need to Know for the 2026 Tax-Filing Season
The IRS deadline for the 2025 tax year is April 15, 2026. US citizens and resident aliens living abroad whose main place of business is outside the US on that date receive an automatic two-month extension to June 15, 2026, provided they attach a statement to the return explaining they qualified. Interest still accrues on any unpaid balance from April 15.8Internal Revenue Service. Automatic 2-Month Extension of Time to File A further extension to October 15 is available by filing Form 4868, but it extends filing only, not payment.
For a US citizen living in Canada, the practical schedule looks like this: pay the IRS by April 15, file and pay the CRA by April 30, file the US return by June 15. Getting payment timing wrong is one of the most common mistakes in cross-border filing.
How the Treaty Prevents Double Taxation
The Convention Between the United States of America and Canada with Respect to Taxes on Income and on Capital exists so you are not fully taxed twice on the same income. Its primary tool is the foreign tax credit. Tax paid to the CRA can be credited against US liability on Form 1116, dollar-for-dollar up to the amount of US tax attributable to the foreign-sourced income.9Internal Revenue Service. Foreign Tax Credit Canada offers a mirror credit for taxes paid to the IRS on US-sourced income. Because Canadian rates are generally higher than US rates, US citizens in Canada often find the foreign tax credit eliminates most or all of their US federal liability, though this depends on income type and amount.
The treaty also caps cross-border withholding on dividends. Portfolio dividends are capped at 15% of the gross amount. Where the beneficial owner is a company holding at least 10% of the voting stock of the payer, the cap drops to 5%.10Government of Canada. Convention Between Canada and the United States of America
Retirement Accounts and Social Security
RRSPs and RRIFs
Canadian Registered Retirement Savings Plans and Registered Retirement Income Funds can be tax-deferred for US purposes, but only if you elect (or are deemed to have elected) deferral under the treaty. Without the election, the IRS would tax income accruing inside the account annually, even before any withdrawal. Under Revenue Procedure 2014-55, eligible individuals are automatically treated as having made the election, and the formerly required Form 8891 is now obsolete.11Internal Revenue Service. Publication 597 – Information on the United States-Canada Income Tax Treaty If you previously reported RRSP or RRIF income annually on your US return, you are not automatically eligible and need IRS approval to switch to deferral.
Social Security
Under the 1997 Protocol, social security benefits are generally taxable only in the country where the recipient lives. US Social Security paid to a Canadian resident is taxed by Canada as if it were a Canada Pension Plan benefit, with 15% of the amount exempt from Canadian tax.11Internal Revenue Service. Publication 597 – Information on the United States-Canada Income Tax Treaty Canadian social security paid to a US resident is taxed by the US as if it were a Social Security Act benefit.12Internal Revenue Service. United States – Canada Income Tax Convention
A separate US-Canada Totalization Agreement prevents workers from paying social security contributions to both countries at once. Employees sent temporarily to work in the other country generally keep paying into their home system. Self-employed workers pay into the system of the country where they reside. You need a certificate of coverage to prove the exemption; US employers keep it on file for audits, and self-employed workers attach a copy to the US return each year.13Social Security Administration. Totalization Agreement with Canada
The TFSA Trap for US Persons
The Tax-Free Savings Account is a strong savings vehicle for Canadians without US status, but for US citizens or Green Card holders living in Canada it is a problem. The treaty does not extend special treatment to TFSAs the way it does for RRSPs and RRIFs. The IRS has not issued formal guidance, but practitioners widely treat TFSAs as foreign grantor trusts, which means income earned inside the account is taxable on your US return each year even though it grows tax-free in Canada.
Reporting compounds the problem. If the TFSA qualifies as a foreign trust, you may need to file Forms 3520 and 3520-A annually with the IRS, in addition to reporting the account on your FBAR and potentially Form 8938. The penalties for missing these filings are steep, and many cross-border tax professionals advise US persons in Canada to avoid contributing at all because the US tax cost and compliance burden outweigh the Canadian tax benefit.
Reporting Foreign Assets to Both Countries
Both agencies require detailed reporting of foreign financial assets on top of any income tax you owe. You can owe zero additional tax and still face large penalties for missing these forms.
FBAR (FinCEN Form 114)
Any US person with a financial interest in or signature authority over foreign financial accounts must file an FBAR if the combined maximum value exceeded $10,000 at any point during the year. It is filed electronically with the Treasury Department, not the IRS, and is due April 15 with an automatic extension to October 15.14Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR)
Penalties are severe. For non-willful violations, the maximum civil penalty is $16,536 per form. For willful violations, it rises to the greater of $165,353 or 50% of the highest account balance per violation per year.15eCFR. 31 CFR 1010.821 – Penalty Adjustment and Table Willful penalties can stack across multiple years.
Form 8938
Form 8938 is filed with your US tax return and covers a broader range of assets than the FBAR, including interests in foreign entities and certain financial instruments beyond bank accounts. Thresholds depend on where you live and your filing status:
- Living in the US, single: total value of specified foreign assets exceeds $50,000 on the last day of the tax year or $75,000 at any point during the year.
- Living abroad, single: total value exceeds $200,000 on the last day of the year or $300,000 at any point during the year.
Married couples filing jointly have higher thresholds in both categories.16Internal Revenue Service. Do I Need to File Form 8938, Statement of Specified Foreign Financial Assets
The penalty for failing to file starts at $10,000. If you still have not filed 90 days after the IRS mails you a notice, an additional $10,000 penalty applies for each 30-day period of continued non-compliance, up to a maximum additional penalty of $50,000.17Office of the Law Revision Counsel. 26 USC 6038D – Information With Respect to Foreign Financial Assets Form 8938 and the FBAR overlap but are not interchangeable; filing one does not satisfy the other, and they go to different agencies.
Canada’s Form T1135
Canadian residents who own specified foreign property with a total cost exceeding $100,000 CAD at any time during the year must file Form T1135 with the CRA. Specified foreign property includes funds held outside Canada, shares of non-resident corporations, and real property situated outside Canada. The threshold is based on original cost, not current market value.18Canada Revenue Agency. Foreign Income Verification Statement If your foreign property cost $250,000 CAD or more at any point, you must complete the more detailed Part B rather than the simplified Part A.
The penalty for failing to file T1135 is $25 per day, minimum $100 and maximum $2,500. Gross negligence raises the penalty to $500 per month up to $12,000. After 24 months of continued non-compliance, the CRA can impose an additional penalty equal to 5% of the cost of the foreign property itself.19Canada Revenue Agency. Penalties
Leaving Canada Triggers a Departure Tax
One asymmetry catches people off guard when they move from Canada to the US. When you cease to be a Canadian resident, the CRA treats you as having sold most of your property at fair market value on the date you leave, even though you still own it. This “deemed disposition” can create an immediate capital gains tax bill on unrealized gains in stocks, jewelry, art, and similar assets.20Canada Revenue Agency. Leaving Canada (Emigrants) If your total property had a fair market value above $25,000 when you left, you must also file Form T1161 listing those properties. The IRS imposes no equivalent exit tax on ordinary emigrants leaving the US, though a separate expatriation tax applies to citizens who renounce and certain long-term Green Card holders who abandon status.