The Treaty Tie-Breaker, Test by Test: Permanent Home, Centre of Vital Interests, Habitual Abode, Citizenship, and What the CRA and IRS Look For

Article IV(2) of the treaty is four tests and a fallback, applied in order, to a person both countries consider resident. The tests are short and the disputes are long, because each test turns on facts that the CRA and IRS weigh differently, and because the taxpayer's own paperwork (leases, licences, memberships, returns) is the evidence. This article takes each test in turn: what it means, what the agencies look for, and which way common cross-border fact patterns fall.

Key takeaways

• Test 1, permanent home: a dwelling available for continuous use, owned or rented, arranged for permanence rather than a short stay. A person with a permanent home in only one country is a resident of that country; the analysis stops.
• Test 2, centre of vital interests: applied when the person has a permanent home in both countries or neither. The country with which personal and economic relations are closer: family, social relations, occupation, political and cultural activities, place of business, place from which property is administered.
• Test 3, habitual abode: applied when vital interests are indeterminate. The country where the person more regularly and normally lives, measured over a meaningful period; a day count is evidence but not the test.
• Test 4, citizenship: applied when habitual abode is in both or neither. A citizen of only one country is assigned to it.
• Fallback, competent authority: dual citizens (or citizens of neither) go to the mutual agreement procedure.
• Consequence: assignment to the US makes a Canadian a deemed non-resident under section 250(5) with departure tax; assignment to Canada makes a US-law resident a non-resident for US income tax, filing a 1040-NR with Form 8833 (with expatriation risk for long-term green card holders).

Test 1: permanent home

The OECD commentary, which both agencies follow, describes a permanent home as any form of dwelling (house, apartment, rented room) that the person has arranged and retained for permanent use, as opposed to a stay of short duration. Ownership is not required; a lease is enough. Availability is the point: a home the person can use at any time is a permanent home even if they rarely do. A home rented to a third party on an arm's-length lease is not available and is not a permanent home. A hotel, a friend's spare room, or a short-term rental for a specific trip is not permanent.

What the agencies look for: deeds and leases; whether a Canadian home was sold, rented out, or left available; whether the US dwelling is a lease of a year or more or a month-to-month or corporate apartment; utility accounts; where belongings are kept.

Fact patterns. A Canadian who sells the Toronto house and buys in Florida: permanent home in the US only; assigned to the US. A Canadian who keeps the Toronto house available and rents a Florida apartment for the winter: permanent home in both; proceed to test 2. A Canadian executive who moves to New York, leases an apartment, and leaves the family in the Toronto house: permanent home in both; proceed.

Test 2: centre of vital interests

The country with which the person's personal and economic relations are closer, considered as a whole. Personal relations: where the spouse and children live, where the person's social life, clubs, religious community, and cultural activities are, where they vote, where they hold a driver's licence and health coverage. Economic relations: where they work, where their business is, where their investments and bank accounts are, where their property is managed from. The test weighs the whole picture; the agencies give substantial weight to the family's location and to the employment.

What the agencies look for: the family's location (school enrolment, spouse's employment); employment contracts; business registrations; bank and brokerage statements; club and professional memberships; driver's licences; health cards; voter registration; the address used on tax returns, insurance, and correspondence; frequency and pattern of travel.

Fact patterns. Family in Canada, job in the US: usually Canada (personal relations weigh heavily). Family moved to the US, job in the US, Canadian home rented out, Canadian accounts retained: the US. Retired couple with homes in both, most assets in Canada, children in Canada, but wintering six months in Florida: usually Canada. A single professional with an apartment in each city, work in the US, social life split: indeterminate; proceed to test 3.

Test 3: habitual abode

Where the person habitually lives, meaning the country where they are more regularly present, considered over a period long enough to establish a pattern. The commentary cautions against a mechanical day count, but the agencies do count days as the primary evidence. The test asks where the person's ordinary life is, not where they happened to be during a particular year.

What the agencies look for: travel records (passport stamps, CBP and CBSA entry records, credit card and phone location data); calendars; where medical appointments and routine activities occur.

Fact patterns. A person with 200 days a year in the US and 165 in Canada over several years: habitual abode in the US. A person with a 50/50 split: habitual abode in both; proceed to test 4.

Test 4: citizenship

A person who is a citizen of only one of the two countries is a resident of that country. A dual citizen, or a citizen of neither, proceeds to the fallback.

The fallback: competent authority

The competent authorities of the two countries (the CRA's and the IRS's designated offices) settle the question by mutual agreement under Article XXVI. The taxpayer requests it; the process takes years; the outcome is a negotiated assignment. Rare.

The consequences

Assigned to Canada. Canadian resident; taxed on worldwide income in Canada. For US purposes, a non-resident alien for the period, filing a 1040-NR reporting US-source income with Form 8833 disclosing the treaty position. A green card holder in this position risks the card and, if a long-term resident, triggers the expatriation rules.

Assigned to the US. US resident; taxed on worldwide income in the US. For Canadian purposes, section 250(5) deems the person a non-resident from the date of assignment; the departure tax applies; Canadian-source income is thereafter taxed by withholding; a final T1 is filed for the departure year.

Arranging the facts

The tests are applied to facts, and the facts can be arranged in advance. A person who wants to be assigned to the US sells or leases out the Canadian home (removing the Canadian permanent home), moves the family, closes or reduces Canadian ties, and documents it. A person who wants to remain Canadian while working in the US keeps the Canadian home available, keeps the family in Canada, keeps the Canadian licences and health coverage, and limits US ties to the job. A person who does neither is assigned by the agencies on whatever facts exist, often in an audit years later, with the departure tax and the non-resident consequences applied retroactively.

Worked example

A Montreal architect takes a two-year contract in Boston, leases a Boston apartment, keeps the Montreal condo (not rented; she returns one weekend a month), keeps her Quebec licence and RAMQ (with an approved absence), and her partner stays in Montreal.

• Test 1. Permanent home in both (Montreal condo available; Boston lease).
• Test 2. Personal relations: partner, social life, licence, health coverage in Quebec. Economic relations: employment in Boston; investments in Canada. Weighed together: Canada. Assigned to Canada.
• Result. Canadian and Quebec resident; worldwide income on the T1 and TP-1 with a foreign tax credit for US and Massachusetts tax on the Boston wages; 1040-NR with Form 8833 reporting the wages as a treaty non-resident (Article XV does not exempt them: the employer is US-resident); Massachusetts non-resident return.

Change one fact: the partner moves to Boston and the condo is rented out. Test 1: permanent home in the US only. Assigned to the US from that date; departure tax; final T1 and TP-1.

Official sources

"Where by reason of the provisions of paragraph 1 an individual is a resident of both Contracting States, then his status shall be determined as follows: (a) he shall be deemed to be a resident of the Contracting State in which he has a permanent home available to him; if he has a permanent home available to him in both States or in neither State, he shall be deemed to be a resident of the Contracting State with which his personal and economic relations are closer (centre of vital interests); (b) if the Contracting State in which he has his centre of vital interests cannot be determined, he shall be deemed to be a resident of the Contracting State in which he has an habitual abode; (c) if he has an habitual abode in both States or in neither State, he shall be deemed to be a resident of the Contracting State of which he is a citizen; and (d) if he is a citizen of both States or of neither of them, the competent authorities of the Contracting States shall settle the question by mutual agreement." — Canada-United States Tax Convention, Article IV(2), https://www.canada.ca/en/department-finance/programs/tax-policy/tax-treaties/country/united-states-america-convention-consolidated-1980-1983-1984-1995-1997.html

"Taxpayers use this form to make the treaty-based return position disclosure required by Internal Revenue Code section 6114. Dual-resident taxpayers use this form to make the treaty-based return position disclosure required by Regulations section 301.7701(b)-7." — Internal Revenue Service, About Form 8833, https://www.irs.gov/forms-pubs/about-form-8833

Practitioner note

The tie-breaker is decided on documents the client already has, and the CRA and IRS read them the same way we do: the lease, the school enrolment, the licence, the health card, the pattern of travel. We ask the client which country they want to be resident in, tell them which facts produce that answer, and check that the paperwork says the same thing before either agency asks.

See also: For the situations that create dual residency and what follows the assignment, read resident of both countries: how the treaty tie-breaker decides. Planning a move? Start with the Canada-to-US tax checklist and browse every corridor by city, province, and state.

Next step

Fairlight prepares the test-by-test residency analysis under Article IV, the documentation supporting the position, and the returns in both countries that follow from the assignment. See cross-border pricing or book a call.