What the treaty does
The Convention Between Canada and the United States of America with Respect to Taxes on Income and on Capital — the "tax treaty" — does three big things:
- Prevents double taxation by assigning each type of income a primary taxing country and requiring the other to give a credit.
- Caps cross-border withholding taxes — for example, U.S. dividend withholding drops from 30% to 15%, and most interest is 0%.
- Breaks residency ties when both countries would otherwise call you a resident.
The residency tie-breaker (Article IV)
If Canada and the U.S. both consider you a resident, the treaty decides in this order:
- Where you have a permanent home available to you;
- Your centre of vital interests (personal and economic ties);
- Where you have a habitual abode;
- Your citizenship; and failing all else, the two tax authorities decide by agreement.
You claim a treaty residency position with the IRS on Form 8833. (Snowbirds who meet the U.S. day-count test but stay closer to Canada often use the simpler Form 8840 Closer Connection Exception instead — see our Substantial Presence Test guide.)
Common cross-border traps the treaty doesn't fully solve
- PFICs. Canadian mutual funds and ETFs held by a U.S. person are "passive foreign investment companies" — punitive U.S. tax and reporting. The treaty doesn't fix this.
- TFSA & FHSA. Not recognized by the IRS, so a U.S. person can owe U.S. tax and face extra reporting on them.
- RRSP election. The treaty lets a U.S. person defer U.S. tax on RRSP growth — but it must be reported correctly.
- Reporting is separate from the treaty. FBAR, IRS Form 8938, and CRA Form T1135 can still apply even when no tax is owed.
Put the treaty to work for you
Claiming treaty benefits correctly is where cross-border families save — or lose — real money. A complimentary call with a dual-licensed advisor (CFP® in Canada & the U.S.) will map your situation.
Book a complimentary call →Frequently asked questions
What does the Canada–U.S. tax treaty do?
It stops the same income being taxed twice, caps cross-border withholding (e.g., 15% on dividends, 0% on most interest), and provides a residency tie-breaker.
What's the withholding rate on U.S. dividends?
15% for a Canadian resident (down from 30%), or 5% for a ≥10% corporate holding. U.S. dividends inside an RRSP are generally exempt from U.S. withholding.
How are RRSP/RRIF withdrawals taxed?
Periodic RRIF payments to a U.S. resident get a reduced 15% Canadian withholding; lump-sum RRSP withdrawals face 25% with no treaty reduction.
How is Social Security / CPP / OAS taxed?
Taxable only in the country where you live (Article XVIII). U.S. Social Security to a Canadian resident is taxed only in Canada, with 15% exempt; CPP/OAS to a U.S. resident is taxed only in the U.S.
What is the residency tie-breaker?
Article IV: permanent home → centre of vital interests → habitual abode → citizenship. Claimed on Form 8833.
Educational information only — not tax or legal advice. Treaty outcomes depend on your specific facts, elections, and correct filings; rates and rules can change. Confirm with the CRA/IRS or a qualified cross-border professional before acting.