Spousal Trusts for Mixed-Status Couples: Canada's Rollover Vehicle Meets the US Foreign Trust Rules

The spousal trust is Canadian estate planning's workhorse for second marriages, blended families, and control from the grave: leave property not to the spouse but to a trust in which the spouse has a life interest — all income to the spouse for life, no one else able to touch capital while the spouse lives — and the Income Tax Act treats it like a spousal transfer, rolling the property in at cost and deferring the deemed disposition until the surviving spouse dies. The design conditions are strict and the reward is large. Now make the surviving spouse a US citizen, or make a child-beneficiary of the remainder a US person, and a second rulebook opens: the trust is Canadian-resident, therefore a foreign trust to the US, and a US-person life tenant receiving all its income annually is a US beneficiary of a foreign non-grantor trust — Form 3520 every year, the trust's cooperation needed for beneficiary statements, throwback exposure if income is ever accumulated, and PFIC problems if the trust holds Canadian funds. None of this makes the structure wrong; it makes it a structure that has to be administered for two audiences.

Key takeaways

• Canadian qualification: the spouse must be entitled to all income for life and no other person may receive or use capital during the spouse's life. Meet the tests and property rolls in at cost; fail them (a trustee power to sprinkle to children, for instance) and the rollover is lost and the deemed disposition hits the final return.
• The second deemed disposition: the trust itself has a deemed disposition of its property when the life-tenant spouse dies — the deferral ends inside the trust, at the trust's (top) rates unless planning distributes or steps around it.
• US characterization: Canadian-resident trust = foreign trust. A US-person spouse-beneficiary files Form 3520 for each year with distributions; because a qualifying spousal trust must distribute all income currently, the annual Form 3520 is a permanent feature, and the trust should issue foreign non-grantor trust beneficiary statements so distributions are taxed as current income rather than under the default (throwback-flavored) method.
• Income mismatches: trust income taxed to the spouse in Canada (as trust income payable) and in the US (as trust distribution) mostly lines up person-to-person — the good case — but PFIC holdings, capital gains retained in the trust, and currency create the usual cross-border noise.
• US estate tax at the first death: if the first-to-die spouse is the US person, property passing to a non-citizen surviving spouse's trust raises the marital deduction question — a Canadian spousal trust is not a QDOT, and the treaty's marital credit is the usual relief path for estates near the exemption.
• Trustee and investment design: Canadian-resident trustees keep the trust Canadian (and keep US court/control tests unmet); investments should avoid PFICs where a US person is a beneficiary; and the trust deed should authorize the US filings and information sharing the US spouse will need.

Why families still choose it

The alternatives are worse for the facts that call for a spousal trust. Outright to the spouse loses control of the remainder — the second spouse can redirect everything away from the first family. No rollover means immediate tax at death on everything. The spousal trust holds both: deferral and destination. The US overlay costs an annual filing and disciplined administration, which is a fair price where the remainder is meant for children of a first marriage and the assets carry large accrued gains.

Worked example

A Montreal businessman, Canadian only, dies leaving $4 million of appreciated investments to a spousal trust for his second wife — a US citizen living with him in Westmount — remainder to his two Canadian daughters. Canada: full rollover into the trust; no tax at his death; the trust pays the wife all income annually; the deferred gain is taxed inside the trust at her death. US: the wife reports the trust's distributions on her 1040 with a Form 3520 each year; the trustees (her brother-in-law and a Montreal trust company — deliberately no US trustee) issue beneficiary statements annually; the portfolio was scrubbed of Canadian mutual funds in favor of direct holdings and US-listed ETFs before funding, so no Form 8621s. Her own estate has no interest in the remainder — the life interest dies with her, keeping the trust out of her US gross estate under the design. The daughters, both Canadian, take the remainder with no US strings. Total US cost of the structure: one annual form and an investment policy — against a deferral worth several hundred thousand dollars of Canadian tax for two decades.

Official sources

The CRA explains that when a person dies, they are considered to have disposed of their capital property immediately before death at fair market value, with the resulting gains reported on the final return, and that property that passes to a surviving spouse or a qualifying spousal trust can instead transfer at cost. — Canada Revenue Agency, Doing taxes for someone who died, https://www.canada.ca/en/revenue-agency/services/tax/individuals/life-events/doing-taxes-someone-died.html

The IRS explains that Form 706-QDT is used to report the estate tax due on distributions from a qualified domestic trust — the trust required for property passing to a surviving spouse who is not a US citizen to qualify for the estate tax marital deduction — and on the property remaining in the trust when it terminates or the spouse dies. — Internal Revenue Service, About Form 706-QDT, https://www.irs.gov/forms-pubs/about-form-706-qdt

U.S. persons file Form 3520 to report certain transactions with foreign trusts, ownership of foreign trusts under the grantor trust rules, and receipt of certain large gifts or bequests from certain foreign persons. — Internal Revenue Service, About Form 3520, https://www.irs.gov/forms-pubs/about-form-3520

Practitioner note

Spousal trusts are where we spend the most drafting time on mixed-status couples, because the Canadian conditions are rigid and the US filings are forever — the deed has to make the trustees able and obliged to feed the US spouse's return every year. Designed once, properly, the structure runs quietly; designed by a domestic-only precedent, it produces a decade of missed 3520s and a very expensive cleanup.

See also: Browse every cross-border tax topic guide, organized by situation.

Next step

Fairlight prepares the spousal trust design and review for mixed-status couples — qualification, trustee residence, investment policy, and the annual filing calendar on both sides. See cross-border pricing or book a call.