Spousal trusts in Canada: cross-border planning for mixed-status couples

A Canadian spousal trust lets you transfer property to a trust for your spouse’s benefit without triggering an immediate tax bill. Canada treats the transfer as happening at the property’s adjusted cost base rather than fair market value, deferring capital gains tax until the surviving spouse dies or the trust disposes of the property. That’s powerful domestic planning. But when one spouse is Canadian and the other is a US person (citizen, green card holder, or US resident), the trust falls into a gap between two tax systems that weren’t designed to work together. The US doesn’t recognize the Canadian spousal trust as a distinct category. It classifies the trust under its own grantor/non-grantor framework, imposes reporting requirements (Form 3520, Form 3520-A), and may deny the marital deduction that US estate planning depends on. This article covers how the spousal trust works, where the cross-border complications arise, and what mixed-status couples need to think about before setting one up.

What qualifies as a spousal trust?

A spousal trust under the Income Tax Act must meet two conditions: the surviving spouse is entitled to receive all the income of the trust during the spouse’s lifetime, and no one else can receive or use any income or capital while the spouse is alive. These conditions appear in both ITA 70(6) (testamentary) and ITA 73(1) (inter vivos).

• The “all income” requirement is strict: if the trust instrument gives the trustee discretion to withhold income, the trust doesn’t qualify; the spouse must have an absolute and indefeasible right to all income
• The trustee can have discretion over capital distributions (since only the spouse can receive capital during the spouse’s lifetime), but income must flow as of right

The “no encroachment” requirement means no person other than the surviving spouse can receive or use the income or capital of the trust while the spouse is alive. A trust that allows the trustee to distribute capital to the couple’s children during the surviving spouse’s lifetime fails the test. The children can be contingent beneficiaries who receive the capital after the surviving spouse dies, but during the spouse’s lifetime, the spouse must be the exclusive beneficiary.

A common drafting mistake: giving the trustee power to distribute capital to the spouse “or the spouse’s children” kills the qualification, even if the trustee never actually distributes to the children. Trustee discretion over capital to the spouse alone is fine, because the spouse is the only possible recipient. But naming any other person as a potential capital recipient during the spouse’s lifetime disqualifies the trust.

The trust can be either a testamentary trust (created on death, typically through a will) or an inter vivos trust (created during the settlor’s lifetime). The rollover mechanism differs in each case, but the qualifying conditions are the same. A family trust with multiple beneficiaries won’t qualify as a spousal trust, because the “exclusive beneficiary” condition fails.

How does the inter vivos rollover work?

ITA 73(1) allows a Canadian resident to transfer capital property to a spousal trust during their lifetime at the property’s adjusted cost base rather than fair market value. The trust takes over the transferor’s cost base, and the unrealized gain rolls into the trust. The rollover is automatic and doesn’t need to be elected.

• The transferor can elect out under ITA 73(1)(a) to trigger the gain (for example, to use up capital losses or the lifetime capital gains exemption)
• Inter vivos spousal trusts are less common than testamentary ones because the deferral is the same either way, and the trust adds complexity (annual T3, potential attribution under ITA 74.1/74.2)

The inter vivos spousal trust is less common than the testamentary version because the tax deferral is the same either way, and creating a trust during your lifetime introduces complexity (annual T3 filing, a separate tax entity, potential attribution rules under ITA 74.1 and 74.2) without a clear advantage in most cases. Where it does make sense: creditor protection, managing assets for a spouse who needs structured support, or as part of a broader estate planning strategy that includes freezes or multi-generational planning.

How does the testamentary rollover work?

ITA 70(6) overrides the general deemed disposition at death rule in ITA 70(5) when property passes to a qualifying spousal trust through the deceased’s will. Instead of paying capital gains tax on unrealized gains at death, the property transfers at adjusted cost base. The gain is deferred until the surviving spouse dies or the trust disposes of the property.

• This is the more common scenario: the will creates the trust, the executor transfers property, and the surviving spouse receives all income while no one else can touch the capital
• On the spouse’s death, the trust distributes to remainder beneficiaries (typically children) or winds up

Since the 2016 changes, testamentary spousal trusts are taxed at the top marginal rate on retained income (only a Graduated Rate Estate or Qualified Disability Trust gets graduated rates). The income-distribution strategy is simple: distribute everything to the surviving spouse, who pays tax at their own marginal rate.

The executor must designate the qualifying spousal trust in the deceased’s terminal return. If the executor doesn’t make the designation, or if the trust terms don’t meet the ITA 70(6) conditions, the general deemed disposition under ITA 70(5) applies, and the estate pays tax on all unrealized gains at death.

What triggers tax when the spouse dies?

When the surviving spouse dies, ITA 104(4) triggers a deemed disposition of all the trust’s capital property at fair market value. The trust pays capital gains tax on the difference between FMV at that point and the original adjusted cost base that rolled into the trust. The bill can be substantial because gains accumulate from the original transfer.

• If the transferor’s ACB was $100,000 and the shares are worth $1,200,000 when the surviving spouse dies, the trust has a $1,100,000 capital gain
• The trust pays the tax (not the surviving spouse’s estate), reducing what’s available for remainder beneficiaries

The trust is responsible for paying the tax, not the surviving spouse’s estate. The trust’s assets fund the payment, reducing what’s available for the remainder beneficiaries (typically the children). This is the trade-off: you defer the tax, giving the surviving spouse full use of the assets during their lifetime, but the bill comes due on the second death. Unlike the US, where assets get a stepped-up basis at death, Canada’s deemed disposition creates a real tax liability on gains that may have been accruing for decades.

Does the 21-year rule apply?

Canadian trusts are generally subject to a deemed disposition every 21 years under ITA 104(4). Spousal trusts get a carve-out: under ITA 104(4)(a.4), the 21-year rule doesn’t apply while the beneficiary spouse is alive. The first deemed disposition is deferred until the spouse’s death.

• This is a main advantage over a regular family trust, which faces its 21-year deemed disposition at a fixed date (a 2005 family trust hits the wall in 2026)
• A spousal trust created in 2005 for a spouse who’s still alive in 2026 doesn’t face that problem; the clock starts only at the spouse’s death

Once the surviving spouse dies, the deemed disposition fires under ITA 104(4) and the trust pays capital gains tax at that point. If the trust continues after the spouse’s death (for example, to hold assets for minor children), the 21-year clock starts running from the spouse’s date of death.

What are joint partner and alter ego trusts?

Joint partner trusts (ITA 73(1.01)) and alter ego trusts (ITA 73(1.02)) serve similar purposes with different conditions. Both require the settlor to be 65 or older at creation and allow a tax-deferred rollover on transfer.

• An alter ego trust is for a single individual; the settlor receives all income and is the only possible capital recipient during their lifetime; on death the deemed disposition fires and assets pass to the named beneficiaries
• A joint partner trust extends this to couples; both the settlor and spouse must be entitled to all income and only they can receive capital; the deemed disposition is deferred until the last surviving partner’s death

A joint partner trust extends this to couples. Both the settlor and their spouse (or common-law partner) must be entitled to all the income, and only they can receive capital during both lifetimes. The deemed disposition is deferred until the death of the last surviving partner.

For cross-border purposes, the analysis in our estate freeze and alter ego guide covers the US treatment in detail. The short version: if the settlor or the spouse is a US person, these trusts are foreign trusts for US purposes. The US grantor trust rules apply, triggering annual reporting on Form 3520-A. The probate-avoidance benefit doesn’t produce US estate tax savings because the trust assets are included in the US gross estate under IRC 2036(a)(1) (retained life estate). Whether the trust is revocable or irrevocable under Canadian law, the US classification depends on the grantor trust rules, not the Canadian label.

What if the surviving spouse is a US person?

When the surviving spouse is a US citizen, green card holder, or US resident, the Canadian spousal trust becomes a foreign trust from the US perspective. The US has its own framework for taxing foreign trusts, and that framework doesn’t care whether Canada considers the trust a spousal trust or not.

The first question is classification under IRC 671-679: is the trust a grantor trust or a non-grantor trust? The answer depends on who created the trust:

• Inter vivos, US-person settlor. IRC 679 treats the US settlor as the trust’s owner. All income is reported on the settlor’s Form 1040. When the settlor dies, grantor trust status ends and the trust becomes a non-grantor foreign trust.
• Testamentary, deceased was a US person. No living grantor exists. The trust is a non-grantor foreign trust. The surviving spouse reports distributions as income, subject to the accumulation distribution rules if the trust has retained income from prior years.
• Testamentary, deceased was Canadian, surviving spouse is a US person. IRC 679 doesn’t apply (the transferor wasn’t a US person). Non-grantor foreign trust. The US-person spouse files Form 3520 annually.
• Inter vivos, Canadian settlor, US-person spouse. IRC 679 doesn’t apply directly. But IRC 672(f) can still classify the US-person spouse as an owner if the spouse has the power to vest the trust corpus in themselves. Fact-specific analysis.

The classification matters because it determines the reporting obligations and the tax treatment of distributions. For a Canadian trust with a US beneficiary, the accumulation distribution rules under IRC 665-668 can apply to distributions of retained income from a non-grantor foreign trust, creating throwback tax plus an interest charge.

What US forms does the trust trigger?

The US reporting obligations depend on the trust’s classification and the US person’s role (owner, transferor, or beneficiary). Penalties for late or missing filings are severe: often $10,000 per form per year, with additional percentage-based penalties.

• Form 3520-A: required when the trust is a grantor trust with a US owner; the US owner typically files it since the Canadian trustee may not know about the obligation; due March 15

Form 3520 (Annual Return to Report Transactions with Foreign Trusts). Required for US persons who transfer property to a foreign trust, are treated as owners of a foreign trust, or receive distributions from a foreign trust. For the US-person surviving spouse receiving income distributions from a Canadian spousal trust, Form 3520 is an annual obligation. Due with the personal return (April 15, or extended).

FBAR (FinCEN 114). If the trust holds financial accounts and the US beneficiary has a financial interest in or signature authority over those accounts, FBAR filing may be required. The threshold is $10,000 aggregate value. A US-person beneficiary of a Canadian trust who’s entitled to all the income likely has a “financial interest” in the trust’s bank and investment accounts.

Form 8938 (Statement of Specified Foreign Financial Assets). The US-person beneficiary may need to report their interest in the trust under FATCA, depending on value thresholds ($50,000 for US residents, $200,000 for those filing from abroad).

Does the QDOT question apply here?

It depends on who dies first and whether the deceased was a US person. A QDOT under IRC 2056A matters when a US person’s estate wants the marital deduction for property passing to a non-citizen surviving spouse. If the deceased was Canadian (not a US person), the QDOT question doesn’t arise because US estate tax doesn’t apply to their estate (except for US-situs assets).

• US citizen dies, Canadian spouse survives: the estate wants the unlimited marital deduction under IRC 2056, but without a QDOT it’s denied; a Canadian spousal trust almost certainly won’t meet the QDOT requirements (US trustee, withholding, US court jurisdiction)
• Canadian spouse dies first, US citizen survives: the Canadian side works as expected (ITA 70(6) rollover); no QDOT needed since the deceased wasn’t a US person; the US citizen has reporting obligations (Form 3520, possibly 3520-A) but no QDOT requirement
• Both are US persons: the unlimited marital deduction is available between US citizen spouses, so no QDOT; the Canadian spousal trust still needs to meet ITA 70(6), and the US classifies and taxes it under its own rules

Can you claim the US marital deduction?

The unlimited marital deduction under IRC 2056 lets a US person leave any amount to their US-citizen spouse free of estate tax, but it requires outright transfers or qualifying trusts (QTIP, general power of appointment, or QDOTs for non-citizen spouses). A Canadian spousal trust drafted for ITA 70(6) may or may not qualify as a US QTIP under IRC 2056(b)(7).

• A US QTIP requires the surviving spouse to receive all income at least annually, which matches the Canadian conditions, but it also requires a Form 706 election and a domestic trust (or QDOT)
• A Canadian trust is a foreign trust, so a QTIP election alone won’t work for a non-citizen surviving spouse; the trust must also meet QDOT requirements, or a separate QDOT must be created
• Advisors typically keep US and Canadian estate planning vehicles separate rather than forcing one trust to satisfy both sets of rules

How should mixed-status couples plan?

For a couple where one spouse is Canadian and the other is a US person, the planning has to work in both tax systems simultaneously. You can’t design for one country and bolt on the other’s rules afterward, because the fix for one side often breaks the other.

The practical planning takeaways for mixed-status couples:

Start with the order-of-death analysis. Each spouse dying first creates different problems. The plan has to work (or at least not create a disaster) regardless of who dies first.

Separate vehicles for separate purposes. A Canadian spousal trust serves the Canadian rollover. A QDOT (or QTIP trust) serves the US estate tax deferral. Trying to make one trust satisfy both sets of requirements is possible in theory but fragile in practice. Two trusts with coordinated terms is usually more robust.

Budget for annual compliance. A US-person beneficiary will file Form 3520 every year, possibly Form 3520-A, and may need FBAR and Form 8938. The compliance cost runs $2,000 to $5,000 per year on top of the trust’s Canadian T3 filing. This is a permanent cost for the life of the trust.

Coordinate the foreign tax credits. When the spousal trust pays Canadian tax, the US person can claim a foreign tax credit on their US return, but the credit is only useful if there’s US tax on the same income. Timing mismatches between the two countries’ rules are common and reduce the effective value of the credits.

Does the treaty help with double taxation?

The Canada-US tax treaty, particularly Article XXIX B, coordinates between the Canadian deemed disposition at death and the US estate tax. But the treaty was designed for direct ownership, not for the layered structures that spousal trust planning creates.

• Article XXIX B(3) provides a marital credit for estates of US citizens or residents leaving property to a non-citizen surviving spouse, partially replicating the marital deduction, but with limits the unlimited deduction doesn’t have
• Article XXIX B(6) provides that each country must allow a credit for taxes paid to the other on the same property at death, though credits don’t fully eliminate double taxation because the taxes are calculated differently (Canadian income tax on gains vs US estate tax on full value)

Article XXIX B(6) provides that each country must allow a credit for taxes paid to the other country on the same property at death. In practice, the credits don’t fully eliminate double taxation because the two taxes are calculated differently (Canadian income tax on gains vs US estate tax on full value), and the credit is limited to the tax attributable to the overlapping property.

For spousal trusts, the treaty interaction gets more involved because the Canadian and US tax events may occur at different times. A spousal trust that defers the Canadian tax until the second death can create a timing mismatch with US estate tax at the first death if the first to die is a US person. The treaty credits don’t always bridge that gap.

What should you do next?

If you’re a mixed-status couple with meaningful assets, get cross-border estate planning advice before either spouse creates a will or trust. Start with the basic questions: who’s a US person, what assets are in each country, and what happens if either spouse dies first. The inheritance tax rules in Canada and the US estate tax rules are different enough that planning for one without the other is a reliable way to overpay.

• QDOT planning for non-citizen spouses
• Canadian trust with a US beneficiary
• Estate freezes, alter-ego trusts, and bypass trusts
• Deemed disposition at death vs US stepped-up basis
• The Canada-US tax treaty explained
• US person as trustee of a Canadian trust, what changes when the trustee is a US citizen or green card holder
• Income splitting: Canada vs US, the broader income-splitting landscape for cross-border couples

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.