One Spouse in the US, One Still in Canada: Residency for Each, the Filing Status Each Country Allows, and the House Between You

Married couples usually move together, and when they don't, the tax systems keep treating them as a unit while the facts have divided them. The starting principle: residency is determined per individual — the spouse who moves to the US becomes a US tax resident (substantial presence, or a green card) and, if they have severed their own Canadian ties, a non-resident of Canada; the spouse who stays is a Canadian resident and, absent US presence, not a US person at all. But the moving spouse's Canadian residency is not decided by their own departure alone: a spouse and a dwelling remaining in Canada are the two strongest residential ties under the CRA's analysis, and a person who leaves for a US job while their spouse and home stay in Canada is at real risk of remaining a Canadian resident (factually resident) despite living in the US — taxable in Canada on worldwide income and in the US on worldwide income, with the treaty's tie-breaker then deciding which country is the residence for treaty purposes (permanent home available in both; center of vital interests — where the spouse and family are, which usually points to Canada; habitual abode; nationality). The moving spouse's first question, therefore, is not "which country" but "am I still a Canadian resident" — and the answer often is yes, for as long as the marriage and the home remain in Canada, unless the tie-breaker is run and documented in the US's favor (a permanent home in the US, the center of vital interests migrated — harder to show while the family stays). With residency established for each, the filing statuses. US side, the moving spouse: married filing separately is the default when the other spouse is a nonresident alien (the Canadian spouse) — the least favorable US status (narrow brackets, phase-outs at half the joint thresholds, the US$125,000 NIIT threshold); married filing jointly is available only by the section 6013(g) election, which treats the Canadian spouse as a US resident for the whole year and every year until revoked, bringing their worldwide income into the US return (the Canadian salary, taxed by Canada and credited on the joint return) and their accounts into the FBAR and Form 8938 — a trade the joint-election guide models, often favorable when the Canadian spouse's income is modest and the credits absorb it, unfavorable when it's large or when the Canadian spouse holds PFICs and a TFSA; head of household is available to a US-resident spouse with a qualifying dependent where the nonresident-alien spouse is not treated as a resident and the couple meets the living-apart tests — a status the split couple with children sometimes qualifies for and rarely knows about. Canadian side: there is no joint return; each spouse files their own T1 (the staying spouse as a resident; the moving spouse as a resident or non-resident depending on the analysis above); spousal amounts and credits are claimed per the rules for spouses living apart for reasons other than marriage breakdown (the spouses are still spouses for Canadian purposes — the spousal amount, pension splitting, and the attribution rules all continue to apply), and the staying spouse's benefits (the Canada child benefit, the GST credit) are computed on family net income including the moving spouse's worldwide income where they remain a resident, or on the staying spouse's income alone with the moving spouse's non-residency reported. The house: jointly owned, it is the staying spouse's principal residence and the moving spouse's Canadian dwelling (a residential tie) — for the moving spouse who becomes a non-resident, their half is not deemed disposed on departure (Canadian real property is exempt from the departure tax), the principal residence exemption continues for years the property is ordinarily inhabited by the spouse (the family-unit designation rules allow one property per family, and the spouse's occupancy qualifies), and the eventual sale runs section 116 for the non-resident's half and the ordinary exemption for the resident's; for US purposes, the moving spouse's half is a foreign residence whose eventual sale gain is measured in USD from original basis, with the section 121 exclusion available if the moving spouse meets its ownership and use tests (use by the spouse counts for certain purposes — the exclusion's married-couple rules are analyzed specifically). The divergence-year traps: the moving spouse's Canadian return is a full-year resident return if residency didn't sever, and a part-year return with the departure-date deemed disposition if it did — the wrong choice produces either an unfiled worldwide-income year or an unnecessary departure tax; the US dual-status return for the arrival year with the married-filing-separately default unless the joint election is made (which must be made on a timely return and applies to the whole year); the treaty tie-breaker position, if taken, disclosed on Form 8833 and consistent with the Canadian filing; the accounts — the moving spouse's Canadian accounts on their FBAR and 8938 from residency, the joint accounts at full value, the staying spouse's accounts only if the joint election pulls them in; and the RRSPs, TFSAs, and the rest running per the account guides for the moving spouse alone. The planning that helps: decide the moving spouse's residency deliberately — sever if the family will follow within a defined period and the tie-breaker can be documented, or accept dual filing with the treaty tie-breaker to Canada if the split is long-term and the family stays — and file consistently in both countries; model the joint election annually (it's revocable, and the answer changes as the staying spouse's income and accounts change); document the living-apart facts for head-of-household eligibility where children are involved; and set the sale-of-house plan (which spouse's exemption, which year, section 116 mechanics) before the listing.

Key takeaways

• Residency is per spouse — but the staying spouse is the moving spouse's strongest Canadian tie: a spouse and a home in Canada often keep the mover a Canadian resident despite a US job; the treaty tie-breaker (center of vital interests) then usually points to Canada.
• US filing status for the mover: married filing separately by default (the worst status); married filing jointly only through the 6013(g) election that pulls the Canadian spouse's worldwide income and accounts into the US return; head of household possible with a qualifying dependent and the living-apart tests.
• Canada has no joint return: each spouse files their own T1; spousal amounts, pension splitting, and attribution continue; the staying spouse's benefits are computed on family income including a still-resident mover's worldwide income.
• The house is exempt from departure tax and stays a principal residence through the staying spouse's occupancy; the eventual sale runs section 116 for a non-resident spouse's half and the section 121 analysis on the US side.
• The divergence-year traps: full-year versus part-year Canadian return for the mover, the US dual-status return with the joint election decision, the 8833 tie-breaker disclosure, and the accounts and RRSP/TFSA treatment for the mover alone.
• Decide residency deliberately, model the joint election annually, and plan the house sale before listing — the three decisions that turn a split household from a filing accident into a filing plan.

The split-couple annual review

Mover's Canadian residency: severed (documented tie-breaker to the US) or continuing (dual filing, tie-breaker to Canada, 8833)? Mover's US status: married filing separately, joint election (modeled on this year's numbers), or head of household (living-apart facts documented)? Staying spouse: T1 as a resident, benefits computed on the correct family income. Accounts: whose go where, joint accounts at full value on the mover's FBAR. The house: exemption years tracked for both, the sale plan current. Fifteen minutes each spring, and the couple whose tax lives diverged files as if someone planned it.

Worked example

A Burlington couple: he takes a two-year assignment in Houston; she stays with the two children and the jointly owned house, earning C$70,000. His residency: the CRA's analysis would keep him a Canadian resident (spouse and dwelling in Canada); the tie-breaker points to Canada (center of vital interests with the family) — he files a full-year Canadian resident return on worldwide income including the Houston salary (with a foreign tax credit for US tax), and a US resident return (substantial presence) with a Form 8833 treaty position claiming Canadian residence and filing as a nonresident on US-source income (the salary) only — consistent, dual, and designed. His US status: married filing separately as the default; the joint election is modeled and rejected (her income and TFSA would enter the US return for little benefit at his US tax level as a treaty nonresident). Her side: an ordinary T1, benefits computed on family income including his worldwide income (he remains a resident), the spousal amount unavailable given her income but pension splitting noted for later. The house: no departure tax (he never severed), the exemption running for both through her occupancy. Year three, the family decides she and the children will join him: the analysis flips — his ties sever on the family's move, the departure-date deemed disposition applies to his non-exempt property, the house is sold (both exemptions apply, section 116 unnecessary since both are resident on the sale date if the sale precedes the move), and the joint election is re-modeled for the first full US year, when her income is US-source and her TFSA has been closed. Same couple, two entirely different filing structures — the split years and the reunited year — each correct because someone decided which it was.

Official sources

The CRA lists the significant residential ties that determine residency status as "a home in Canada," "a spouse or common-law partner in Canada," and "dependants in Canada." — Canada Revenue Agency, Determining your residency status, https://www.canada.ca/en/revenue-agency/services/tax/international-non-residents/information-been-moved/determining-your-residency-status.html

"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-1980-1983-1984-1995-1997-2007.html

Practitioner note

The split-residency couple is the case where the tax systems keep the marriage together after the spouses have separated their addresses, and the mover's biggest surprise is that a spouse and a house in Canada usually keep them a Canadian resident. Our annual review decides the mover's residency deliberately, models the joint election on the year's actual numbers, checks head-of-household eligibility where children are involved, and keeps the house-sale plan current — because the divergence year is the one that produces either a missed worldwide-income return or an unnecessary departure tax.

See also: For the re-entry checklist for returning to Canada, see the re-entry checklist for returning to Canada; and browse every cross-border tax topic guide, organized by situation.

Next step

Fairlight prepares the split-household engagement — per-spouse residency determination with the treaty tie-breaker documented, US filing-status modeling including the joint election and head-of-household tests, the Canadian benefit and credit computations, and the family-home exemption and sale plan. See cross-border pricing or book a call.