US taxes after moving to Canada: what Americans still owe the IRS (2026 guide)

You’ve left the US for Canada? Congratulations — but there’s one reality to grasp early: the United States is one of the very few countries that taxes by citizenship, not residence. As long as you hold US citizenship (or a green card), you must file with the IRS every year, wherever in the world you live. This guide walks through both systems and the mistakes that cost real money.

Rule #1: two tax returns a year, not one

• In Canada: you generally become a tax resident of the Canada Revenue Agency (CRA) on the date you effectively settle (home, family, ties). From that date, Canada taxes your worldwide income. Read the official newcomers page (sources below) and pin down your exact tax-residency start date — everything flows from it.
• In the US: you keep filing Form 1040 every year as long as you’re a citizen, even if you end up owing nothing.

The good news: between the Canada–US tax treaty and credit mechanisms, actual double taxation is rare — but the paperwork is heavy, and the penalties for not filing are harsh even when you owe zero tax.

How to avoid paying twice

Two main mechanisms on the US side:

1. The Foreign Tax Credit (Form 1116): you credit Canadian taxes paid against your US liability. Since Canadian rates are generally higher than US rates, most Americans in Canada end up owing zero US tax on employment income — this is the better choice for the majority.
2. The Foreign Earned Income Exclusion (FEIE — Form 2555): excludes earned income up to roughly US$130,000 (indexed every year — check irs.gov). It does not cover passive income (interest, dividends, rent).

Picking the wrong mechanism can cost thousands — use a cross-border accountant at least for your first year.

FBAR: the filing everyone forgets

If the combined total of your non-US financial accounts exceeds US$10,000 at any point in the year — Canadian bank accounts, RRSP, TFSA and RESP all added together — you must e-file the FBAR (FinCEN Form 114) every year. A separate filing (FATCA — Form 8938) kicks in above higher thresholds. Penalties for missing these run into the thousands of dollars, even with no tax owed.

The big trap: the TFSA (and Canadian funds)

The Tax-Free Savings Account (TFSA) is great for Canadians — and a trap for US citizens:

• The Canadian tax exemption is not recognized by the IRS: TFSA gains are taxable in the US every year, and since you paid no Canadian tax on them, there is no foreign tax credit to offset it.
• The account may be treated as a “foreign trust” requiring complex filings (Forms 3520/3520-A), with heavy penalties for omissions.
• Canadian mutual funds and ETFs held outside registered accounts often fall under the US PFIC rules (Form 8621) — more tax, more paperwork.

By contrast, the RRSP is recognized under the tax treaty: tax deferral works in both countries. It’s generally the safest vehicle for an American in Canada.

Social security and retirement

The US–Canada totalization agreement prevents double contributions (CPP in Canada vs. US Social Security) and lets you combine contribution years from both countries for eligibility. Your American years aren’t lost.

A practical first-year checklist

1. Establish your Canadian tax-residency start date and keep the proof (lease, entry date…).
2. Don’t open a TFSA before talking to a cross-border accountant — the RRSP is far less problematic.
3. Inventory all your financial accounts ahead of the FBAR.
4. Keep your last three US tax returns — you’ll need them (also when preparing the move itself).
5. Years behind on filing? The IRS Streamlined compliance procedures exist — use them before the IRS comes to you.

Still at the planning stage? Start with our complete guide to immigrating from the United States and the Canadian healthcare guide for Americans.

This article is general information, not legal or tax advice. Rules and thresholds change every year: always verify on canada.ca and irs.gov, and work with a specialized accountant for your situation.