Canadian Trust With U.S. Beneficiaries: Form 3520, the Throwback Tax, and the Distribution That Arrives as Accumulated Income

A Canadian trust with an American beneficiary is ordinary in Canada and a foreign trust in the United States, and the U.S. rules on foreign trusts were written to discourage exactly the accumulation that Canadian family trusts do routinely. The classification: a trust administered in Canada with Canadian trustees is a foreign trust for U.S. tax (the court test and the control test of section 7701(a)(30)(E) — a trust is domestic only if a U.S. court can exercise primary supervision over its administration and one or more U.S. persons control all of its substantial decisions); a U.S. person who receives a distribution from it — or is treated as its owner — has reporting and tax obligations. Grantor or non-grantor: a foreign trust is a grantor trust for U.S. purposes (its income taxed to the person who created and funded it) only in limited circumstances when the grantor is a foreign person — generally if the grantor can revoke the trust or the only distributees during the grantor's life are the grantor and the grantor's spouse (section 672(f)); so most Canadian family trusts (created by a Canadian parent for children, some of whom are in the United States) are foreign non-grantor trusts for U.S. purposes; a trust created by a person who later becomes a U.S. person — or created by a U.S. person — is a different case (a U.S. person who transfers property to a foreign trust with U.S. beneficiaries is treated as its owner — section 679), and a Canadian who becomes a U.S. resident within five years after funding a trust is treated as having transferred that property on the residency starting date, becoming its U.S. owner if it has a U.S. beneficiary (section 679(a)(4), the pre-immigration trust rule). Distributions of current income: a U.S. beneficiary receiving a distribution from a foreign non-grantor trust out of the trust's distributable net income for the year is taxed on it as income of the same character (interest, dividends, capital gains — a foreign trust's capital gains are included in its distributable net income under section 643(a)(6)), with a foreign tax credit for the Canadian tax (the Part XIII withholding on the trust's distribution to a non-resident — 25 percent, or 15 percent under the treaty for income items — the NR301 guide — and, where the trust earns Canadian "designated income" such as real property rents or gains on taxable Canadian property, Part XII.2 tax at 40 percent); the trust should provide a foreign non-grantor trust beneficiary statement (the Foreign Nongrantor Trust Beneficiary Statement described in the Form 3520 instructions — showing the distribution's components) so the beneficiary can report it correctly; without the statement, the beneficiary must use the default method (treating a portion as accumulation distribution — below). Accumulation distributions — the throwback: when a foreign non-grantor trust distributes more than its current year's distributable net income — distributing income it accumulated in earlier years — the excess is an accumulation distribution, taxed to the U.S. beneficiary under the throwback rules: the income is "thrown back" to the years it was earned and taxed by spreading it over those years and applying the beneficiary's own marginal rates from three of the five preceding years (section 667, computed on Form 4970 with Form 3520's Part III), all of it as ordinary income (capital gains lose their character), plus an interest charge on the tax deferred (at the federal underpayment rate, compounded daily, over the weighted-average period of accumulation — section 668 — and not deductible), with the total capped at the amount distributed; for a Canadian family trust that has accumulated capital gains on a business's shares for twenty years and then distributes them to a U.S. beneficiary, the throwback tax and interest can consume most of the distribution — the single most expensive cross-border trust mistake. The default method: a beneficiary who lacks the trust's records (the trust's accumulation history, which a Canadian trust's accountant never computed under U.S. principles) can use the default method — a portion of the distribution exceeding 125 percent of the average distributions of the prior three years is treated as an accumulation distribution (the rest is taxed as current ordinary income, and the interest charge runs over half the number of years the trust has existed) — rough but usable. Form 3520 — the reporting: a U.S. person who receives a distribution from a foreign trust reports it on Form 3520 (Part III) by the due date of their income tax return — April 15 for a calendar-year individual, extended when the return is extended, with penalties for failure — the greater of US$10,000 or 35 percent of the gross distribution (section 6677); the trust itself, if a U.S. person is treated as its owner, files Form 3520-A (the foreign trust's annual information return, due March 15 for a calendar-year trust; the penalty for failure is the greater of US$10,000 or 5 percent of the trust assets treated as owned by the U.S. person) — or the owner files a substitute 3520-A with their 3520 if the trust won't; the IRS's penalty enforcement on Form 3520 has been aggressive (penalties assessed automatically and abated only on reasonable-cause showings). The 21-year rule — the Canadian timing: Canadian trusts are deemed to dispose of their capital property at fair market value every 21 years (the 21-year rule), so Canadian family trusts often distribute their property to beneficiaries before the 21st anniversary — in kind, on a tax-deferred rollover to Canadian-resident beneficiaries (section 107(2)); but section 107(5) denies the rollover for distributions to non-resident beneficiaries (other than of Canadian real property, resource property and property of a business carried on in Canada — a distribution of other property, such as private company shares, to a non-resident beneficiary is a disposition at fair market value, taxed in the trust), so a U.S. beneficiary's share either triggers Canadian tax in the trust on distribution or is held in trust past the anniversary (with the deemed disposition); and the U.S. beneficiary receiving appreciated property generally takes the trust's U.S. basis (section 643(e)) — Canada's deemed disposition doesn't step it up for U.S. purposes — and the in-kind distribution still carries out the trust's income, so it can be an accumulation distribution subject to the throwback. Planning: a Canadian trust with U.S. beneficiaries distributes income currently each year (so U.S. beneficiaries receive current distributable net income, taxed simply, rather than accumulation), keeps U.S.-principle records of its distributable net income and accumulations, provides the beneficiary statements, and — where a family member will become a U.S. person — considers distributing before the move, restructuring the U.S. beneficiary's share (for example, a separate trust for the U.S. beneficiary designed around the U.S. rules), or dividing the trust; estate trusts (a testamentary trust from a Canadian parent's estate) face the same rules for a U.S. child beneficiary — the inheritance guide's U.S. heir section. The bookkeeping: the trust's classification; each U.S. beneficiary's status; the trust's distributable net income and accumulations computed under U.S. principles annually; beneficiary statements; Part XIII on distributions to non-residents; Form 3520 for each U.S. recipient; the 21-year date and the distribution plan. The errors: a U.S. beneficiary never filing Form 3520 (the 35 percent penalty); an accumulated-gains distribution taken without knowing the throwback (most of it lost to tax and interest); no beneficiary statement (forcing the default method); a distribution of property to the U.S. beneficiary at the 21-year date assumed to roll over (it doesn't for a non-resident); and a family member's move to the United States without reviewing the trust first.

Key takeaways

• A Canadian-administered trust is a foreign trust to the IRS — most Canadian family trusts are foreign non-grantor trusts for their U.S. beneficiaries.
• Current-year income distributions are taxed simply — character preserved, with a credit for the Canadian Part XIII withholding — if the trust provides a beneficiary statement.
• Distributions of income accumulated in earlier years trigger the throwback tax — all ordinary income, spread over the accumulation years and taxed at the beneficiary's recent marginal rates, plus a compounding interest charge — potentially most of the distribution.
• Form 3520 reports every distribution to a U.S. person — the penalty for missing it is the greater of US$10,000 or 35 percent of the distribution, assessed aggressively.
• Canada's 21-year rule rollover doesn't extend to non-resident beneficiaries — a distribution in kind to a U.S. beneficiary is taxed in the trust.
• Plan before a family member becomes a U.S. person: distribute currently, keep U.S.-principle records, and consider separating the U.S. beneficiary's share.

The Canadian trust's U.S. beneficiary file

Trust classification (foreign; grantor or non-grantor; pre-immigration rules). U.S. beneficiaries and their status. Distributable net income and accumulations under U.S. principles, each year. Beneficiary statements. Part XIII and NR4s on distributions to non-residents. Form 3520 for each U.S. recipient (and 3520-A if owned). The 21-year date; the non-resident distribution consequences. The accumulation history is the record that decides the throwback.

Worked example

A Montreal family trust created in 2008 holds the shares of the family's manufacturing company; its beneficiaries are the founder's three children, one of whom moved to Boston in 2019 and became a U.S. resident. The trust has paid dividends from the company each year and distributed them to the two Canadian children while accumulating the Boston child's share — eighteen years of accumulated income by 2026. Before the trust's 21st anniversary in 2029, the family's advisers model the Boston child's options: a distribution of her accumulated share (about C$900,000) would be an accumulation distribution — thrown back across the years it accumulated as ordinary income with a compounding interest charge, consuming most of it in U.S. tax — plus, for a distribution in kind, the trust's own Canadian tax on a deemed disposition at fair market value (income already taxed in a personal trust comes out as capital, without Part XIII withholding). The plan: going forward, her share of each year's dividends is distributed currently (taxed in the United States as current dividends — qualified, with a credit for the Canadian withholding — and reported on Form 3520 with the trust's beneficiary statement); her accumulated share is examined for a restructuring that the desks and the family's Quebec counsel model together under both countries' rules, rather than distributed in a single throwback year. Her brother, who had moved to Chicago in 2021 and received a C$200,000 distribution in 2023 without reporting it, received a Form 3520 penalty notice for US$52,000 — 35 percent of the distribution — which a reasonable-cause request partly abated.

Official sources

The IRS explains: “U.S. persons (and executors of estates of U.S. decedents) file Form 3520 to report: Certain transactions with foreign trusts. Ownership of foreign trusts under the rules of sections Internal Revenue Code 671 through 679. Receipt of certain large gifts or bequests from certain foreign persons.” — Internal Revenue Service, About Form 3520, Annual Return To Report Transactions With Foreign Trusts and Receipt of Certain Foreign Gifts, https://www.irs.gov/forms-pubs/about-form-3520

IRS Publication 597 explains: “This publication provides information on the income tax treaty between the United States and Canada. It discusses a number of treaty provisions that most often apply to U.S. citizens or residents who may be liable for Canadian tax.” — Internal Revenue Service, Publication 597 (10/2015), Information on the United States–Canada Income Tax Treaty, https://www.irs.gov/publications/p597

Practitioner note

A Canadian family trust with an American beneficiary is ordinary in Canada and a foreign trust in the United States, and the U.S. rules punish exactly what Canadian trusts routinely do: accumulate income for years and distribute it later, where the throwback tax and its compounding interest can take most of the distribution. Our desks compute the trust's accumulations under U.S. principles every year, distribute U.S. beneficiaries' shares currently with a beneficiary statement, file every Form 3520 before the 35 percent penalty can attach, and plan the 21-year date knowing the rollover doesn't reach a non-resident beneficiary.

See also: For related guidance, see the throwback tax and Form 3520 for a U.S. beneficiary of a Canadian trust and Form 3520-A and the substitute filing; and browse every cross-border tax topic guide, organized by situation.

Next step

Fairlight Accounting is a cross-border accounting and tax practice with a U.S. Tax Desk and a Canadian Tax Desk. Our U.S. Tax Desk and Canadian Tax Desk handle Canadian trusts with U.S. beneficiaries — foreign trust classification, grantor and pre-immigration trust analysis, U.S.-principle distributable net income and accumulation records, beneficiary statements, Form 3520 and 3520-A compliance with penalty relief, throwback tax planning, Part XIII on distributions, and 21-year rule planning for non-resident beneficiaries. See pricing or book a call.