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: decisions about distributions, investment of trust assets, appointment and removal of trustees, and anything that isn’t purely ministerial.

The word “all” is doing heavy lifting. 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 what makes co-trustee arrangements effective.

The IRS looks at substance, not titles:

• A nominal trustee who rubber-stamps someone else’s decisions doesn’t control anything
• The key questions: who picks investments, who decides distributions, who can change the trust’s terms, who appoints successors
• Ministerial acts (bookkeeping, collecting rents) don’t count as substantial decisions

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 in Canadian accounts and beneficiaries in Canada, the court test usually isn’t met. No US court has primary supervisory jurisdiction. The trust stays foreign even with a US-person sole trustee.

That doesn’t mean there are no consequences:

• The trustee must report the trust to the IRS and personally owes FBAR on every financial account the trust holds outside the US
• If the trust has US beneficiaries, the grantor trust rules can change who pays tax on the trust’s income
• If the trust holds US-situs assets (a US brokerage account, US real estate), a US court might claim supervisory jurisdiction, meeting both prongs without anyone intending it

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 a separate taxpayer or whether its income is attributed to the “grantor” or “owner.”

IRC 679 catches most Canadian trusts with US connections: if a US person transfers property to a foreign trust that has (or may later have) a US beneficiary, the trust is a grantor trust owned by the transferor. A trustee doesn’t become the “owner” just by serving, but edge cases apply if the trustee also contributed assets (even indirectly).

The key rules and interactions:

• IRC 672(f) limits the grantor trust rules when the grantor is not a US person. Exceptions in 672(f)(2) cover trusts where the grantor can revoke or where only the grantor/spouse benefits during the grantor’s lifetime.
• For Canadian alter ego trusts or spousal trusts, 672(f)(2) often applies while the settlor is alive. The trust is treated as owned by the Canadian settlor, so no US tax on trust income.
• The trouble starts at the settlor’s death: 672(f)(2) disappears, accumulation distribution rules kick in for US beneficiaries, and a US-person trustee now faces potential domestic classification plus 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.

The main forms:

• Form 3520: reports the trust’s existence and reportable events (contributions, distributions, trustee changes). Penalty for not filing: the greater of $10,000 or 35% of the gross reportable amount. Recent policy changes have made relief somewhat easier to get.
• Form 3520-A: required if the trust is a grantor trust with a US owner. Filed by March 15. Penalty: $10,000 per year, and the statute of limitations on the US owner’s return doesn’t start until the form is filed.
• Form 8938 (FATCA): required if the trustee’s interest in the foreign trust exceeds the filing threshold ($50,000 at year-end for US residents, higher for those abroad).
• Form 8865 or 5471: not typically relevant for trusts, but required if the trust owns interests in foreign partnerships or corporations.

Does the trustee owe FBAR on trust accounts?

Yes. If the US-person trustee has signature authority over the trust’s financial accounts outside the US, they must file an FBAR (FinCEN Form 114) when the aggregate value exceeds $10,000 at any point during the year. It doesn’t matter that the trustee holds the accounts in a fiduciary capacity rather than personally.

A Canadian family trust typically holds a brokerage account, a bank account, and sometimes a mortgage account. The trustee has signature authority over all of them. Key details:

• Filed electronically through FinCEN’s BSA E-Filing system by April 15 (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. Payments to a non-resident trustee or non-resident beneficiaries can attract 25% withholding, reduced to 15% under the Canada-US tax treaty for most trust distributions.

ITA 94 can also deem a non-resident trust to be Canadian-resident if it has a “resident contributor” or “resident beneficiary.” For most Canadian family trusts this isn’t the issue, but if the trust was structured as non-resident, the interaction with US classification rules creates dual-taxation exposure.

The practical risks:

• If the trust’s Canadian 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 tax debt 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. The “all substantial decisions” test requires that US persons control every one of those decisions. If even one is reserved to a non-US person, the trust fails the control prong and stays foreign.

The co-trustee needs real authority. A nominal appointment won’t hold up. The IRS can look through to the substance. Key requirements:

• The trust deed must explicitly reserve at least one category of substantial decision (typically distributions or investment authority) to the Canadian co-trustee
• The trust’s administration must reflect that division in practice

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. A Canadian parent creates a family trust, appoints a Canadian trustee, and names their US-citizen child as successor. Nobody reads the succession clause through a US tax lens.

The reclassification analysis doesn’t apply until the US person takes over. While the Canadian trustee is serving, the trust is foreign and the successor has no filing obligations (unless they’re also a beneficiary). Once the Canadian trustee dies, retires, or resigns, everything above applies immediately.

Key safeguards:

• Review the trust deed’s succession provisions proactively
• Build in a structural safeguard (co-trustee or protector) before the succession triggers
• For families with children in both countries, review every trust, including testamentary trusts and inter vivos trusts

Amending a trust deed proactively costs a fraction of the compliance burden that follows an unplanned reclassification.

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+ under ITA 73(1.01)) is a probate-avoidance tool where only the settlor benefits during their lifetime. Key features:

• The settlor transfers assets at cost (no capital gains on transfer), and income is taxed to the settlor under ITA 104(13.4) or attributed back under ITA 75(2)
• Whether the trust is revocable or irrevocable matters for 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. For the substantial decisions test, the protector’s powers count. If a non-US protector holds at least one power qualifying as a “substantial decision” under Treas. Reg. 301.7701-7(d), the trust can’t satisfy the “all” requirement, keeping it foreign even with a US-person trustee.

This is a useful backstop when the family wants a US-person trustee but not a co-trustee arrangement. Considerations:

• The protector doesn’t need day-to-day involvement, just a real power constituting a substantial decision
• The power to remove and appoint trustees is a strong choice (explicitly listed in the regulations); purely administrative powers may not meet the bar
• Many Canadian trust deeds already include protector provisions, but they may not satisfy the US test without amendment

What happens if the trust migrates to the US?

If a Canadian trust accidentally satisfies both prongs of the domestic trust test, it’s reclassified as domestic. A domestic trust is taxed on worldwide income under compressed US trust rates: in 2026, the top 37% bracket hits at roughly $15,200 of taxable income. Every dollar of Canadian-source income becomes taxable in the US, reported on Form 1041.

Practical consequences:

• The trust can claim foreign tax credits for Canadian taxes paid, but timing differences and category limitations often leave gaps
• Canadian capital gains (50% inclusion) and US capital gains (full inclusion) don’t align, so the FTC doesn’t eliminate all double tax

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 creates a specific, expensive set of filing obligations and penalties that follow the appointment immediately.

The checklist:

• Is the proposed trustee a US person? Under IRC 7701(a)(30), that includes US citizens (wherever they live), green card holders, and anyone meeting the substantial presence test. A Canadian born in the US who never renounced citizenship is a US person. A former green card holder still qualifies until formal abandonment.

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.