US person as trustee of a Canadian trust: the tax complications

Canadian estate planning lawyers set up family trusts, spousal trusts, and alter ego trusts regularly. The trustee is usually a family member or close advisor. Nobody asks about the trustee’s citizenship or immigration status, because under Canadian tax law it mostly doesn’t matter. Under US tax law, it matters enormously.

If the trustee of a Canadian trust is a US citizen, green card holder, or any other “US person” for tax purposes, the trust’s entire classification can shift. A trust that was foreign can become domestic. Reporting obligations multiply. The trustee personally owes filings to the IRS and FinCEN. In the worst case, the trust’s income becomes taxable in the US even though none of the trust’s assets or beneficiaries have any US connection beyond that one trustee appointment.

What makes a trust domestic or foreign?

The US classifies every trust as either domestic or foreign under IRC 7701(a)(30)(E). A trust is domestic only if it passes both prongs of a two-part test. If it fails either prong, it’s foreign. Most Canadian trusts fail both prongs and sit firmly on the foreign side, which is usually the intended result.

The two prongs are:

1. Court test: a US court can exercise primary supervision over the trust’s administration
2. Control test: one or more US persons control all substantial decisions of the trust

Both must be satisfied for domestic classification. The court test usually isn’t met for a Canadian trust governed by provincial law with Canadian-resident trustees and Canadian-situs assets. The control test is where things go sideways when someone appoints a US-person trustee.

IRC 7701(a)(31) defines a foreign trust simply as any trust that isn’t domestic. There’s no middle ground. The classification drives everything: income taxation, reporting obligations, penalty exposure, and the treatment of distributions to beneficiaries under the accumulation distribution rules.

How does the substantial decisions test work?

Treasury Regulation 301.7701-7(d) defines “substantial decisions” broadly. They include decisions about distributions, investment of trust assets, appointment and removal of trustees, and any other decisions that aren’t purely ministerial.

The word “all” is doing heavy lifting in this test. It’s not a majority-control test. If a US person controls nine out of ten substantial decisions but a non-US person controls one, the trust fails the control prong and stays foreign. That’s the structural feature that makes co-trustee arrangements effective (more on that below).

The regulations also clarify that the determination is based on who actually controls the decisions, not just who holds the title. A nominal trustee who rubber-stamps decisions made by someone else doesn’t control anything. The IRS looks at the substance: who picks the investments, who decides when and how much to distribute, who can change the trust’s terms, and who can appoint successor trustees.

The regulations draw a line between substantial decisions and ministerial acts like bookkeeping or collecting rents. A Canadian accountant handling the trust’s books doesn’t hold a substantial decision. A US-person trustee who picks the portfolio allocation does.

What happens when a US person becomes trustee?

When a US citizen or green card holder takes over as sole trustee of a Canadian trust, the control test is almost certainly met. The sole trustee controls all substantial decisions by definition. Whether the trust actually flips to domestic depends on the court test.

For a Canadian trust governed by Ontario, BC, Alberta, or Quebec law, with assets held in Canadian accounts and beneficiaries living in Canada, the court test usually isn’t met. No US court has primary supervisory jurisdiction over the trust. So the trust stays foreign even with a US-person sole trustee.

But that doesn’t mean there are no consequences. A US-person trustee of a foreign trust triggers its own layer of obligations. The trustee must report the trust to the IRS. If the trust has US beneficiaries, the interaction with the grantor trust rules can change who pays tax on the trust’s income. And the trustee personally owes FBAR reporting on every financial account the trust holds outside the US.

The risk escalates if the trust holds US-situs assets (a US brokerage account, US real estate). A US court might claim supervisory jurisdiction over those assets, and you’ve met both prongs without intending to.

Does a US trustee trigger grantor trust rules?

This is where it gets layered. The grantor trust rules under IRC 671-679 determine whether the trust is treated as a separate taxpayer or whether its income is attributed to someone else (the “grantor” or “owner”).

IRC 679 is the provision that catches most Canadian trusts with US connections. It says: if a US person transfers property (directly or indirectly) to a foreign trust that has, or may have in the future, a US beneficiary, the trust is treated as a grantor trust owned by the US transferor. The transferor then pays US tax on the trust’s worldwide income annually, regardless of whether any distributions are made.

A US-person trustee doesn’t automatically become the “owner” under IRC 679 just by serving as trustee. The grantor trust rules look at who transferred property to the trust, not who administers it. But there are edge cases. If the US-person trustee also contributed assets to the trust (even indirectly, through services or loans at below-market rates), IRC 679 can apply.

The more common problem is IRC 672(f), which limits the grantor trust rules when the grantor is not a US person. Under IRC 672(f)(1), a foreign person is generally not treated as the owner of a trust, even if they would be under the regular grantor trust rules. There are exceptions in IRC 672(f)(2) for trusts where the grantor can revoke the trust and get the assets back, or where distributions can only go to the grantor or the grantor’s spouse during the grantor’s lifetime.

For a Canadian alter ego trust or spousal trust, the 672(f)(2) exception often applies. These trusts are designed so that only the settlor (or the settlor’s spouse) can benefit during the settlor’s lifetime. If the Canadian settlor is alive and the trust qualifies under 672(f)(2), the trust may be treated as a grantor trust owned by the Canadian settlor. That’s actually a decent outcome for US purposes, because it means the trust’s income isn’t taxed to anyone in the US (the “owner” is a non-resident alien).

The trouble starts when the Canadian settlor dies. The 672(f)(2) exception disappears, and the trust is no longer a grantor trust. If the trust has US beneficiaries at that point, the accumulation distribution rules kick in. If the trust also has a US-person trustee, you’ve now got a trust that might be domestic (if both prongs are met), with accumulated income, US beneficiaries, and a trustee who owes a stack of US filings.

What forms does the US-person trustee file?

A US person who serves as trustee of a foreign trust has personal filing obligations separate from anything the trust itself owes. The IRS doesn’t care that the trust is Canadian, that the trustee lives in Vancouver, or that no trust income has any US source.

Form 3520 (Annual Return to Report Transactions with Foreign Trusts): the US-person trustee files this to report the trust’s existence and any reportable events (contributions, distributions, changes in trustees). The penalty for not filing is the greater of $10,000 or 35% of the gross reportable amount. The penalty is automatic, and the IRS assesses it without having to show that the failure was willful. Relief is available (and recent policy changes have made it somewhat easier to get), but you’d rather not need it.

Form 3520-A (Annual Information Return of a Foreign Trust with a US Owner): this is required if the trust is treated as a grantor trust with a US owner. The trust (through its trustee) files Form 3520-A by March 15, reporting the trust’s income, expenses, and the US owner’s share. The penalty for failing to file is $10,000 per year, and the statute of limitations on the US owner’s tax return doesn’t start running until the form is filed.

Form 8938 (FATCA reporting): the trustee’s interest in the foreign trust is a specified foreign financial asset. If the value exceeds the filing threshold ($50,000 at year-end for US residents, higher for those living abroad), Form 8938 is required.

Form 8865 or 5471: not typically relevant for trusts, but if the Canadian trust owns interests in foreign partnerships or corporations, additional information returns may apply.

Does the trustee owe FBAR on trust accounts?

Yes. If the US-person trustee has signature authority or other authority over the trust’s financial accounts outside the US, the trustee must file an FBAR (FinCEN Form 114) if the aggregate value of those accounts exceeds $10,000 at any point during the year.

A Canadian family trust typically holds a brokerage account, a bank account, and sometimes real estate with an associated mortgage account. The trustee has signature authority over all of them. That’s FBAR territory, and it doesn’t matter that the trustee holds the accounts in a fiduciary capacity rather than personally.

The FBAR is filed separately from the income tax return (electronically, through FinCEN’s BSA E-Filing system) by April 15, with an automatic extension to October 15. Willful penalties can reach 50% of the account balance. Non-willful penalties are capped at $10,000 per report (not per account) following the Supreme Court’s decision in Bittner v. United States (2023).

What about Canadian withholding on the trust?

On the Canadian side, the trustee’s residency matters for Part XIII withholding under the Income Tax Act. If the trust makes payments to a non-resident trustee (or to non-resident beneficiaries), certain types of income can attract Part XIII withholding at 25%, reduced to 15% under Article XVIII of the Canada-US tax treaty for most pension and trust distributions.

There’s also ITA 94, which can deem a non-resident trust to be resident in Canada if it has a “resident contributor” or “resident beneficiary.” For a Canadian family trust with a US-person trustee, ITA 94 usually isn’t the issue (the trust already has Canadian-resident contributors and is filing Canadian returns). But if the trust was structured to be non-resident for Canadian purposes, the interaction between ITA 94 and the US classification rules can create dual-taxation exposure with limited treaty relief.

The practical risk: if the trust’s Canadian tax advisor isn’t aware of the trustee’s US status, they won’t flag the Part XIII withholding obligation. The trust might fail to withhold on distributions to non-resident beneficiaries, creating a Canadian tax debt that the trustee is personally liable for.

Can a Canadian co-trustee fix the problem?

Appointing a Canadian-resident co-trustee is the most common structural fix, and it works if it’s done right. The “all substantial decisions” test requires that US persons control every one of those decisions. If even one substantial decision is reserved to a non-US person, the trust fails the control prong and stays foreign.

The co-trustee needs real authority, though. Appointing a co-trustee in name only, while the US-person trustee makes every actual decision, won’t hold up. The IRS can look through the arrangement to the substance. The trust deed should explicitly reserve at least one category of substantial decision (typically distribution decisions or investment authority) to the Canadian co-trustee, and the trust’s administration should reflect that division.

A common structure:

• US-person trustee: handles day-to-day administration, communicates with beneficiaries, manages tax compliance
• Canadian co-trustee: holds sole authority over distribution decisions, or holds veto authority over distributions and investment policy

This gives the family continuity while preserving the trust’s foreign classification. The division of authority has to be documented in the trust deed (or an amending instrument) and followed in practice.

What if the successor trustee is a US person?

This is the most common mistake in cross-border estate planning that involves trusts. A Canadian parent creates a family trust, appoints a Canadian trustee, and names their US-citizen child as successor trustee. Everyone focuses on the trust’s current operation. Nobody reads the succession clause through a US tax lens.

The reclassification analysis doesn’t apply until the US person actually takes over as trustee. While the Canadian trustee is serving, the trust is foreign and the US-person successor has no filing obligations (unless they’re also a beneficiary). But when the Canadian trustee dies, retires, or resigns, the succession clause activates, and everything described in this article applies immediately.

The fix: review the trust deed’s succession provisions and make sure that if a US person ends up as trustee, there’s a structural safeguard (co-trustee or protector) already built into the deed. Don’t wait until the succession actually happens. Amending a trust deed proactively costs a fraction of the compliance burden that follows an unplanned reclassification.

For families with children in both countries, this review matters for every trust in the family’s structure, including testamentary trusts created by a will, inter vivos family trusts, and any trust that might pass through an estate.

How do alter ego and spousal trusts fit in?

Alter ego trusts and spousal trusts have unique features under Canadian law that create additional complications when a US person serves as trustee.

An alter ego trust (available to Canadians aged 65 or older under ITA 73(1.01)) is a probate-avoidance tool. The settlor transfers assets to the trust at cost (no capital gains tax on the transfer), and the trust’s income is taxed to the settlor under ITA 104(13.4) or attributed back under ITA 75(2). Only the settlor can benefit during the settlor’s lifetime. Whether the trust is revocable or irrevocable under Canadian law matters for the Canadian analysis but plays a different role on the US side.

For US purposes, an alter ego trust usually qualifies under the IRC 672(f)(2) exception: the settlor can revoke the trust and recover the property, or distributions during the settlor’s lifetime go only to the settlor. The trust is a grantor trust “owned” by the Canadian settlor. If the settlor isn’t a US person, there’s no US tax on the trust’s income during the settlor’s lifetime, even if the trustee is a US person.

The complication comes at the settlor’s death. The deemed disposition under ITA 104(4) triggers Canadian capital gains tax. On the US side, the 672(f)(2) exception ends because the settlor is gone. If the trust continues (for the benefit of the settlor’s spouse or children), and the trustee is a US person, you’re now looking at potential domestic classification, grantor trust issues under IRC 679 (if the trust has US beneficiaries), and all the reporting obligations described above.

The same analysis applies to spousal trusts under ITA 70(6). During the surviving spouse’s lifetime, the trust may qualify under 672(f)(2) because only the surviving spouse can receive income or capital. After the surviving spouse dies, the trust’s US classification and tax treatment need to be re-evaluated from scratch.

Can a protector mechanism prevent reclassification?

A trust protector is a person (or entity) given specific powers over the trust, separate from the trustee’s powers. Common protector powers include the ability to remove and appoint trustees, veto distributions, change the trust’s governing law, or add or exclude beneficiaries.

For the substantial decisions test, the protector’s powers count. If the protector is a non-US person and holds at least one power that qualifies as a “substantial decision” under Treas. Reg. 301.7701-7(d), the trust can’t satisfy the “all” requirement. That keeps the trust foreign even if the trustee is a US person.

This is a useful backstop, especially for trusts where the family wants a US-person trustee but doesn’t want a co-trustee arrangement. The protector doesn’t have to be involved in day-to-day administration. They just need to hold a real power that constitutes a substantial decision.

The protector’s power needs to be meaningful enough to constitute a “substantial decision” but not so broad that it makes the trustee’s role ceremonial. A protector with the power to remove and appoint trustees is a strong choice (that’s explicitly listed in the regulations). A protector who can only change administrative details might not meet the bar.

Many Canadian trust deeds already include protector provisions for Canadian-law reasons (flexibility, family governance), but those provisions may or may not satisfy the US test. The deed should be drafted or amended with the US classification test explicitly in mind.

What happens if the trust migrates to the US?

If a Canadian trust accidentally satisfies both prongs of the domestic trust test (US-person trustee controls all substantial decisions, and a US court can exercise primary supervision), the trust is reclassified as domestic. That has real consequences.

A domestic trust is taxed on its worldwide income under the regular US trust tax rates, which are compressed: in 2026, the trust hits the top 37% bracket at roughly $15,200 of taxable income. Every dollar of the trust’s Canadian-source income (interest, dividends, capital gains, rental income) becomes taxable in the US. The trust files Form 1041 (US Income Tax Return for Estates and Trusts) and pays US tax.

The trust can claim a foreign tax credit for Canadian taxes paid on the same income, but timing differences and category limitations often leave gaps. Canadian capital gains are taxed at a 50% inclusion rate; US capital gains are included in full. Canadian trust tax rates and brackets don’t match the US. The FTC smooths out some of the double taxation, but it doesn’t eliminate it.

There’s also a transition issue. If the trust was previously foreign with accumulated income, that income doesn’t disappear when the trust becomes domestic. The treatment depends on whether the trust had US beneficiaries, whether it was a grantor trust, and the trust deed’s specific terms. Getting this wrong locks in a result that’s very expensive to unwind.

The treaty provides some relief, but it wasn’t designed for this scenario. Don’t assume it’ll solve a classification problem that was avoidable with better structuring.

What should families check before naming a trustee?

Before appointing anyone as trustee of a Canadian trust (on the initial deed or as a successor), the following questions need answers. Getting them wrong isn’t a theoretical risk; it’s a specific, expensive set of filing obligations and potential penalties that follow the appointment immediately.

Is the proposed trustee a US person? Under IRC 7701(a)(30), a “US person” includes US citizens (wherever they live), lawful permanent residents (green card holders), and anyone who meets the substantial presence test. A Canadian resident who was born in the US and never renounced citizenship is a US person. A Canadian who holds a green card from years ago but now lives in Canada is still a US person until they formally abandon the card.

Is the proposed successor trustee a US person? The same question applies to everyone named in the succession chain. A trust deed that names three successor trustees should analyze all three.

Does the trust hold any US-situs assets? If the trust owns US real estate, a US brokerage account, or interests in US entities, the court test might be met even though the trust is governed by Canadian law.

Is there a co-trustee or protector? If a US person is going to serve as trustee, a structural safeguard is needed. Either a Canadian co-trustee with real authority over at least one substantial decision, or a non-US protector with a meaningful power.

Has anyone filed the required US forms? If a US-person trustee has been serving without filing Form 3520, Form 3520-A, or FBAR, there’s a delinquent filing problem. The streamlined procedures or the delinquent information return procedures may apply, but the fix gets more complicated (and more expensive) the longer it goes unaddressed.

This isn’t a one-time checklist. Trust circumstances change. A trustee might later get a green card. A beneficiary might move to the US. A successor trustee might acquire US citizenship by descent without anyone realizing it. Review the trust deed periodically with both countries’ rules in mind.

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