The IRS and the CRA are the federal tax authorities of two different countries: the Internal Revenue Service collects federal tax in the United States, and the Canada Revenue Agency does the same job in Canada. They operate under separate laws, separate deadlines, and separate reporting rules. If your income, residency, or citizenship touches both countries, you may owe filings to both agencies in the same year, and the main thing standing between you and double taxation is the US-Canada tax treaty.
What Each Agency Does
The CRA administers Canadian federal tax law and, for every province and territory except Quebec, also collects provincial and territorial income tax on the same return.1Canada Revenue Agency. Provincial and Territorial Tax and Credits for Individuals Most Canadians file a single return, the T1 Income Tax and Benefit Return. Quebec residents file a separate provincial return as well. The CRA also collects the GST and HST, consumption taxes with no direct federal equivalent in the US.
Canadian income tax is layered. The federal government sets its rates and brackets, and each province or territory sets its own on top. Provincial rates and credits vary enough that two people with identical income can face noticeably different total bills depending on where they live.2Canada Revenue Agency. Tax Rates and Income Brackets for Individuals
The IRS is structurally similar as a collector but reaches further in one critical way: it taxes based on citizenship, not just residence. That single difference drives almost every cross-border complication that follows.
Who Has to File With Which Agency
The IRS Follows US Citizens Everywhere
Every US citizen and Green Card holder must file a US federal return and report worldwide income every year, no matter where they live.3Internal Revenue Service. U.S. Citizens and Resident Aliens Abroad A US citizen who has lived in Vancouver for twenty years and earns nothing in the US still owes the IRS a return.
For non-citizens without a Green Card, the IRS uses the Substantial Presence Test. You meet it if you were in the US at least 31 days in the current year and a weighted total of at least 183 days over three years: all the days in the current year, one-third of the prior year’s days, and one-sixth of the days from two years back.4Internal Revenue Service. Substantial Presence Test Meeting the test makes you a US resident alien, taxable on worldwide income.
The CRA Follows Residents, Not Citizens
Canada looks at your real-world ties. The CRA treats you as a factual resident if you have significant residential ties such as a home available to you, a spouse or common-law partner in Canada, or dependents living there. Secondary ties like a Canadian driver’s license, bank accounts, or a provincial health card can reinforce the finding. Factual residents owe Canadian tax on worldwide income.
Even if you have severed those ties, you can be a “deemed resident” if you spend 183 days or more in Canada in a calendar year and are not considered a resident of another country under a tax treaty.5Canada Revenue Agency. Deemed Residents of Canada Deemed residents report worldwide income the same as factual residents.
Moving Between the Two Countries
If you move mid-year, Canada treats you as a part-year resident: worldwide income for the portion of the year you were resident, and only Canadian-source income for the rest.
Leaving Canada triggers an often-unexpected departure tax. When you cease to be a resident, the CRA treats you as having sold most of your property at fair market value on your departure date. This deemed disposition can create an immediate capital gains bill on unrealized gains in stocks, art, jewelry, and similar assets.6Canada 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.
Filing Deadlines That Do Not Line Up
The two agencies’ calendars are close enough to feel the same and different enough to cost you money.
For the 2025 tax year, the CRA deadline for most individuals is April 30, 2026. Self-employed people 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 get an automatic two-month filing extension to June 15, 2026, provided they attach a qualifying statement to their return. 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 on Form 4868, but it extends only the filing deadline, not the payment deadline.
So for a US citizen living in Canada: your CRA return and payment are due April 30, your US payment is due April 15, and your US return is due June 15 under the automatic extension. Confusing the payment dates with the filing dates is one of the most common and most avoidable cross-border mistakes.
How the Tax Treaty Keeps You From Paying Twice
The Convention Between the United States of America and Canada with Respect to Taxes on Income and on Capital exists so the same dollar is not fully taxed by both countries. It works through two main mechanisms: tie-breaker rules for people both countries claim as residents, and foreign tax credits for everyone else.
Tie-Breaker Rules for Dual Residents
When both the IRS and the CRA treat you as a resident, the treaty applies a sequence of tests. It starts with where you have a permanent home available. If both, it looks at your “center of vital interests,” meaning where your personal and economic ties are closer. If that is inconclusive, it looks at your habitual abode. If still unresolved, it defaults to citizenship. If you are a citizen of both or neither, the two governments must settle the question by mutual agreement.9Internal Revenue Service. Treasury Department Technical Explanation of the Convention
One trap: some US states do not honor federal tax treaty provisions. Income sourced in those states may be taxed by the state regardless of what the treaty says about your country of residence.10Internal Revenue Service. United States Income Tax Treaties – A to Z Check with the state’s own tax authority before assuming the treaty covers you fully.
The Foreign Tax Credit
The treaty’s main anti-double-tax tool is the foreign tax credit. Pay income tax to the CRA and you can claim a credit against your US liability on Form 1116, reducing US tax dollar-for-dollar up to the amount of US tax attributable to that foreign-sourced income.11Internal Revenue Service. Foreign Tax Credit Canada offers a mirror credit for US tax paid on US-source income. Because Canadian rates are generally higher than US rates, US citizens in Canada often find the foreign tax credit wipes out most or all of their US federal liability, though the result depends on income type and amount.
Retirement Accounts and Social Security Across the Border
RRSPs and RRIFs
Canadian RRSPs and RRIFs can be tax-deferred for US purposes, but only through a treaty election. Without it, the IRS would tax the income accruing inside the account each year, even on money you have not withdrawn. Under Revenue Procedure 2014-55, eligible individuals are automatically treated as having made the election, and the formerly required Form 8891 is now obsolete.12Internal 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
The treaty’s social security rule is often misread. Under the 1997 Protocol, social security benefits are generally taxable only in the country where the recipient lives, not the country that pays them. US Social Security paid to a resident of Canada is taxed by Canada as if it were a Canada Pension Plan benefit, with 15% of the amount exempt from Canadian tax.12Internal 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.13Internal Revenue Service. United States – Canada Income Tax Convention
Separate from the tax treaty, a US-Canada Social Security Totalization Agreement keeps workers from paying into both systems at the same time. If an employer sends you to work temporarily in the other country, you generally keep paying into your home country’s system. Self-employed workers pay into the system of the country where they reside. A certificate of coverage proves the exemption; US employers keep it on file for IRS audits, and self-employed workers attach a copy to the US return each year.14Social Security Administration. Totalization Agreement with Canada
A Warning on TFSAs
The Tax-Free Savings Account is a strong Canadian savings vehicle, but the treaty does not extend any special treatment to it the way it does for RRSPs and RRIFs. The IRS has not issued formal guidance, and practitioners widely treat TFSAs as foreign grantor trusts, meaning all income inside the account is taxable on your US return each year even though it grows tax-free in Canada. The reporting burden can include annual Forms 3520 and 3520-A on top of FBAR and Form 8938, with steep penalties for missed filings. Many cross-border advisors tell US persons in Canada to skip the TFSA entirely because the US cost outweighs the Canadian benefit.
Reporting Foreign Assets to Both Agencies
Both countries require detailed reporting of foreign financial assets, and these obligations are separate from any tax owed. You can owe nothing extra and still be hit with large penalties for missing the 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 of those accounts exceeded $10,000 at any point in the year. It goes to the Treasury Department electronically, not to the IRS, and is due April 15 with an automatic extension to October 15.15Internal 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 is the greater of $165,353 or 50% of the highest account balance per violation per year.16eCFR. 31 CFR 1010.821 – Penalty Adjustment and Table Willful penalties can stack across years, which is how FBAR cases sometimes produce penalties exceeding the total account value.
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: more than $50,000 on the last day of the year or $75,000 at any point during the year.
- Living abroad, single: more than $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.17Internal 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 sends a notice, another $10,000 applies for each 30-day period of continued non-compliance, up to an additional $50,000.18Office 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, go to different agencies, and often both apply.
Canada’s Form T1135
Canadian residents who own specified foreign property with a total cost exceeding $100,000 CAD at any point in the year must file Form T1135. 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.19Canada Revenue Agency. Foreign Income Verification Statement If the cost reached $250,000 CAD or more at any point, you must complete the more detailed Part B of the form instead of the simplified Part A.
The baseline penalty for missing T1135 is $25 per day, with a minimum of $100 and a maximum of $2,500. If the failure is due to gross negligence, the penalty rises to $500 per month up to $12,000. After 24 months of continued non-compliance, the CRA can add a penalty equal to 5% of the cost of the foreign property itself.20Canada Revenue Agency. Penalties
Between FBAR, Form 8938, and T1135, the same account can show up on three different filings in two different countries. That is the reality of living with both the IRS and the CRA in your life: separate agencies, separate forms, separate penalties, and a treaty that solves the tax arithmetic but not the paperwork.