Spouse Still in Canada After You Move to the US: Taxes and Filing

Wife or husband in Canada, you working in the US: which returns do you file?

Most people in this position file in both countries for at least one year. Canada usually still treats you as a resident while your spouse and children live there, and the US treats you as a resident once you pass the green card test or, on a TN, H-1B, L-1 or other work visa, the substantial presence test (at least 31 days this year and 183 days of weighted presence over three years). When both countries claim you, the Canada–US treaty picks one.

The case stops being simple when both countries call you resident (the treaty decides, and the answer can bring departure tax), when you weigh the joint election (it carries into later years, and once it ends neither of you can make it again), and when children's credits depend on citizenship and where they sleep.

Gather: your US arrival date and a day count, your Canadian and US pay slips, your spouse's Canadian income and tax, the lease or deed for each home, the children's citizenship and school enrolment, your spouse's and children's SSN or ITIN, if any, and balances of every Canadian account in your name.

Does your family staying in Canada keep you a Canadian resident?

Usually, yes, until they leave. The CRA treats a spouse or common-law partner and dependants as significant residential ties, and says a spouse who stays in Canada "will usually be a significant residential tie" (Folio S5-F1-C1, ¶1.11 and ¶1.13).

The CRA's Leaving Canada page says you usually become a non-resident on the latest of the day you leave, the day your spouse and dependants leave, and the day you become resident in your new country. The flight date alone is the common trap. One exception: if you lived in another country before coming to Canada and are going back there, the CRA says you usually become a non-resident on the day you leave, even if your spouse stays behind for a short time to sell your home. A family that stays longer is still a tie the CRA can weigh. For the date rules in depth, see the date you become a non-resident and, for the Canadian side of staying resident, family stays in Canada while you work abroad.

If both countries call you resident, how does the treaty decide?

Article IV(2) of the Canada–US treaty asks, in order: where you have a permanent home available, then your centre of vital interests (closer personal and economic relations), then your habitual abode, then citizenship, then the two tax authorities by agreement. The first test that gives one answer ends the analysis.

How the usual facts tend to point, as conditions, not a verdict:

• A family home in Canada kept for you, and a lease in the US: a permanent home in both countries, so the test moves to vital interests. Spouse and children point to Canada; a permanent US job and a US-based life point to the US.
• The Canadian home rented to strangers or sold, and only a US home: a permanent home in the US only, which points to the US.

The result changes both returns:

State income tax may not follow the treaty: some states do not honor treaty provisions (IRS: tax treaties).

If you stay a Canadian resident, your US salary goes on your Canadian return too, and Canada generally gives a foreign tax credit for the US tax on it (Income Tax Act s. 126); see foreign tax credit review for the proof the CRA accepts.

The tie-breaker test and Form 8833 are covered in the treaty tie-breaker guide. TN workers should also read Canadians on a TN visa.

Married filing jointly with a spouse in Canada, or separately?

By default you file married filing separately. A married couple generally cannot file jointly if either spouse was a nonresident alien at any time in the year (Publication 501). Your standard deduction as married filing separately is the same as for a single filer, US$16,100.

You can instead choose to treat your spouse as a US resident and file jointly, if you are a US citizen or resident at the end of the year and your spouse is not (IRS: Nonresident spouse). What that choice brings in:

Two traps: filing jointly without counting the spouse's Canadian income, and making the choice while also relying on the treaty to be a Canadian resident. While the choice is in effect neither of you can claim to be a Canadian resident under the treaty, so it does not fit a year in which you file Form 1040-NR with Form 8833 as a Canadian resident.

Head of household rarely fits. You count as unmarried for that status when your spouse is a nonresident alien and you do not make the choice, but you still need a qualifying person who lived with you for more than half the year (Publication 501). Children who live in Canada with your spouse do not meet that test. The election, ITIN and head of household rules in general are in married to a nonresident.

Can you claim your kids in Canada on your US taxes?

Sometimes as dependants, rarely for the child tax credit. The IRS lets a dependant be a US citizen, resident alien or national, or a resident of Canada or Mexico (Publication 501). That only passes the citizenship or residence test; the child must also be your qualifying child or qualifying relative.

• Qualifying child: the child must live with you for more than half the year. A child living in Canada with your spouse usually fails this test, unless your time in the US is a temporary business absence and you are expected to return to that home.
• Qualifying relative: possible when the child is not anyone else's qualifying child, has gross income under US$5,300, and you provide more than half the child's support. Publication 501 says a child living in Canada with people who are not US citizens and have no US gross income is not another taxpayer's qualifying child.
• Parents living apart, married or not: if you and the other parent lived apart for the whole last six months of the year, Publication 501's rule for divorced or separated parents can let you claim the child with the other parent's signed release (Form 8332). The support and custody conditions are strict.

The credits have their own tests (IRS: Child tax credit):

A child who is a Canadian citizen only, living in Canada, may still be your dependant but generally brings neither credit. A child who is a US citizen can bring the credit for other dependents if the child is your dependant, but the child tax credit only if the child counts as your qualifying child (a temporary absence or the release rule above).

What changes on your spouse's Canadian return?

Your spouse, as a Canadian resident, can keep receiving the Canada child benefit, but may need to report your income to the CRA even though you file in the US. If your spouse receives the Canada child benefit and you were a non-resident for any part of the year, your spouse fills out Form CTB9, and the benefit uses your income from all sources, inside and outside Canada, for that part of the year (CTB9; T4114). Leaving your income out understates the family income the benefit is based on.

• Spouse amount: if you were a non-resident, your spouse enters your net world income in Canadian dollars (line 30300). A full US salary usually reduces the amount to nothing.
• Pension splitting: both of you must be Canadian residents on December 31 (CRA).
• If you are still a Canadian resident: you file your own Canadian return on world income, and your spouse enters your net income as usual.

The spouse fields and credits are in a non-resident spouse on a Canadian return.

Sending money home, joint accounts and the family home

Ordinary money sent home for the family is neither a deduction for you nor income on your US return. Three things still need attention:

• Gifts to a spouse who is not a US citizen: if you are a US citizen or domiciled in the US (gift tax uses domicile, not the days test), the annual exclusion for such a spouse is US$194,000 (Rev. Proc. 2025-32; Form 709 instructions); large transfers such as putting the home in your spouse's name can exceed it. See the gift tax return guide and, for support payments after a separation, spousal and child support across the border.
• Joint Canadian accounts: as a US resident you file an FBAR if all your foreign accounts together exceed US$10,000 at any time in the year (IRS: FBAR). For Form 8938, when the joint owner is a spouse who is not a "specified individual" (a nonresident alien spouse without the joint-return choice is not one), you count the entire value of the joint account, not half (Form 8938 instructions); the separate-filer thresholds for someone living in the US are more than US$50,000 at year end or US$75,000 at any time. If the treaty makes you a Canadian resident and you file Form 1040-NR with Form 8833, Form 8938 is not required for the part of the year that return covers; the FBAR is still required, because FinCEN defines a US resident by the section 7701(b) tests and the treaty position changes only how your income tax is computed (31 CFR 1010.350; 26 CFR 301.7701(b)-7). See which accounts count for the FBAR.
• The family home in Canada: Canadian real property is not part of the deemed sale when you become a non-resident (CRA: Dispositions of property). Whether it later qualifies for the principal residence exemption is in principal residence exemption.

What happens when your spouse joins you in the US?

Your spouse's move usually sets your own Canadian departure date too, since the CRA's latest-of rule waits for your spouse and dependants to leave. Your spouse then has a departure year in Canada and a first, usually dual-status, year in the US.

On the US side, three paths fit that year (Publication 501; IRS: Nonresident spouse):

• You already made the choice in an earlier year: it continues, and you report both incomes for the whole year.
• Both of you are US residents at year end and one was not at the start: you can choose to be treated as residents for the whole year and file jointly. This choice covers that one year only. Both of you then report world income for the whole year, including your spouse's Canadian income before the move.
• No choice: your spouse is a dual-status filer, and a dual-status filer cannot file jointly or take the standard deduction.

Your spouse's Canadian departure steps are in spouses leaving Canada on different dates. The first US return is in the dual-status return in the year you move to the US.

What records should each of you keep?

Both countries decide residence on facts, so keep proof of where each person lived and slept.

Example

All figures are illustrative. Canadian dollars are C$ and US dollars are US$.

Nurse in Boston, family in Halifax until June

A nurse starts work in Boston on a TN visa in January. Her husband and two children keep the Halifax home until school ends in June.

• Canada: with her family in Halifax, she likely stays resident until they leave in June.
• US: she passes the substantial presence test, so the US treats her as resident too.
• Treaty, home kept for the family: she has a permanent home in both countries, so the test moves to vital interests; spouse and children in Halifax point to Canada for those months.
• Treaty, home rented out in January: if her only permanent home is the Boston apartment, the first test points to the US, and Canada would deem her a non-resident from that point, with departure rules applying earlier.

Engineer in Seattle, wife in Calgary

He earns US$150,000 in Seattle. His wife earns C$70,000 in Calgary and pays Canadian tax on it.

• Canada first: with his wife in Calgary, Canada may still treat him as resident; if the US does too, the treaty decides which country taxes him as a resident before either US filing choice matters.
• Married filing separately: his return shows only his US$150,000, at separate-filer brackets.
• Joint return with the choice: the return shows his US$150,000 plus her C$70,000 converted to US dollars, at joint brackets, and her Canadian tax can support a foreign tax credit. The choice then carries into later years.

Which one costs less depends on both incomes and the credit; the comparison needs both returns worked out.

Father in Phoenix, two children in Toronto

His two children live all year with their mother in Toronto. Neither child is a US citizen, and their mother is not a US citizen and has no US income.

• Citizenship or residence test: passed, as residents of Canada.
• Qualifying child: fails on residence, because they do not live with him for more than half the year, unless their mother signs a release under Publication 501's rule for parents who lived apart for the whole last six months of the year.
• Qualifying relative: possible if each child's gross income is under the limit and he provides more than half of their support.
• Credits: the child tax credit and the credit for other dependents both need a US citizen, national or resident alien, so neither applies. Head of household also fails, since no qualifying person lives with him.

Different for you?

• Both countries call you resident, or you are unsure which home counts: work through the treaty tie-breaker and get cross-border tax help before either return is filed.
• You are deciding whether to make the joint election: compare both ways with married to a nonresident and cross-border tax help; the choice carries forward, and once it ends neither of you can make it again.
• Your children are US citizens, or you are separated from their other parent: the dependant and credit answer can change; get cross-border tax help.
• The treaty makes you a US resident and you own investments in Canada: see deferring departure tax when you move to the US.
• You are on a TN visa: see Canadians on a TN visa.
• You missed FBARs or Form 8938 in earlier years: see missed FBAR or TFSA forms after filing US returns.