Cross-Border Complications

This is the article we wish more business owners would read before they start their estate freeze — not after. If you, your spouse, or any of your intended beneficiaries are U.S. citizens (including dual citizens), green card holders, or U.S. tax residents, a freeze that works perfectly under Canadian tax law can create unexpected and severe consequences under U.S. tax law.

The two systems don’t treat trusts, gifts, or estate transfers the same way — and the differences can be dramatic. A freeze that is routine in Canada can trigger gift tax, grantor trust classification, PFIC rules, estate tax, and extensive reporting obligations under the U.S. Internal Revenue Code. We’ve seen situations where the U.S. compliance costs alone exceeded $25,000 per year.

This article builds on the mechanics described in How an Estate Freeze Actually Works and the trust structures explored in The Role of the Family Trust in an Estate Freeze. It’s not a substitute for specialized cross-border tax advice — it’s a guide to the issues you and your advisors need to identify before implementing a freeze where any U.S. connection exists.

Who Is a “U.S. Person”?

The U.S. tax net is broader than most Canadians realize. You can be caught by these rules even if you’ve lived in Canada your entire adult life — and many people are.

Three categories of U.S. persons and their estate freeze implications

U.S. Citizens

This includes anyone born in the United States, born abroad to a U.S. parent who meets certain residency requirements, or naturalized as a U.S. citizen. And here’s the one that catches people: it includes dual citizens who may have lived in Canada their entire lives but hold U.S. citizenship through birth or parentage. Many of these individuals have no idea they have U.S. tax filing obligations.

Green Card Holders

Current and former holders of a U.S. permanent resident card are subject to U.S. tax on worldwide income. This obligation continues until the green card is formally surrendered through the proper legal process — and this is important — simply moving to Canada and letting the card expire is not sufficient. We’ve encountered clients who moved back to Canada decades ago and assumed the obligation was gone. It wasn’t.

U.S. Tax Residents

Even without citizenship or a green card, you can be treated as a U.S. resident for tax purposes under the substantial presence test. The test uses a weighted formula: days present in the current year, plus one-third of the days in the prior year, plus one-sixth of the days two years prior. If the total equals or exceeds 183, you may be a U.S. tax resident — though a treaty tie-breaker may apply. This is the one that catches snowbirds and frequent business travelers.

The Three Major Danger Zones

When a U.S. person is involved in an estate freeze, three separate areas of U.S. tax law come into play. Each one operates independently — and all three need to be addressed. Missing any one of them can be costly.

Overview of U.S. gift tax, grantor trust rules, and estate tax exposure in an estate freeze

Danger Zone 1: U.S. Gift Tax

Canada has no gift tax. You can give property to your children without triggering a separate gift tax — though Canadian tax rules may deem you to have disposed of the property at fair market value, triggering a capital gain. This is one of the reasons estate freezes work so well in Canada: the transfer of future growth to the next generation simply isn’t treated as a gift.

The United States does have a gift tax — and that changes everything. It applies to U.S. citizens and green card holders regardless of where they live. When a U.S. person implements an estate freeze and transfers growth potential to family members, the IRS may treat this as a taxable gift. The gift tax rate can reach 40%.

The good news is that U.S. persons have a lifetime gift and estate tax exemption of $15 million per person for 2026, made permanent under the One Big Beautiful Bill Act (signed July 2025). For married couples, the combined exemption is $30 million through portability. That’s a generous threshold. But even if the exemption covers the gift, the freeze still needs to be structured carefully to minimize the exposure, and a U.S. gift tax return (Form 709) must be filed for the year of the freeze regardless.

Danger Zone 2: U.S. Grantor Trust Rules

Under Canadian tax law, a family trust is a separate taxpayer. Income earned inside the trust can be allocated to beneficiaries, and the trust files its own T3 return. This separation is fundamental to how estate freezes work in Canada — it’s what makes income splitting and the 21-year deemed disposition rule possible.

Under U.S. tax law, the same trust may be classified as a “grantor trust” — and that’s where the trouble starts. A grantor trust means all of the trust’s income is taxable to the person deemed to be the grantor, regardless of whether the income is actually distributed. If the freezor is a U.S. person and is treated as the grantor, all trust income flows back to their personal U.S. return.

Think about what this means in practice: income may be allocated to Canadian beneficiaries for Canadian tax purposes, but taxed to the freezor personally for U.S. purposes. The same income, taxed twice, in two countries, to two different people. The relief available under the Canada-U.S. Tax Treaty for this specific mismatch is limited.

Danger Zone 3: U.S. Estate Tax

U.S. citizens and green card holders are subject to U.S. estate tax on their worldwide assets at death — and that includes shares of Canadian private corporations. The U.S. estate tax rate reaches 40% on amounts above the exemption. For business owners with significant value in a Canadian company, this is the danger zone that keeps cross-border advisors up at night.

Here’s the core problem: if you’re a U.S. person and you’ve implemented an estate freeze, the preferred shares you hold at death are included in both your Canadian estate (triggering a deemed disposition under subsection 70(5) of the Income Tax Act) and your U.S. estate (for estate tax purposes under the Internal Revenue Code). The same shares, taxed twice, under two different systems.

The Canada-U.S. Tax Treaty provides mechanisms to reduce this double taxation — foreign tax credits and the marital credit under Article XXIX B — but it doesn’t eliminate the issue entirely. Coordinating the two systems requires careful planning to ensure credits are properly claimed and the overall burden is minimized.

The PFIC Trap: A Fourth Danger Zone

Beyond the three headline dangers, there’s a fourth issue that catches many advisors off guard — and it’s a technical one: the Passive Foreign Investment Company (PFIC) rules under the Internal Revenue Code.

A PFIC is any non-U.S. corporation where either 75% or more of gross income is passive income, or 50% or more of its assets produce or are held to produce passive income. There’s no minimum ownership threshold — even a single share held by a U.S. person triggers the rules.

In a typical estate freeze, the Canadian corporation is an active operating business that wouldn’t meet the PFIC definition. But the analysis isn’t always as straightforward as it looks. If the corporation holds significant investment assets — cash reserves, marketable securities, rental properties, or intercompany loans — the asset test may be triggered. And if the freeze involves a holding company structure, the holdco itself may be classified as a PFIC even if the operating subsidiary is not. This is a common trap in multi-entity structures.

When PFIC classification applies, the tax consequences are punitive. Distributions to a U.S. shareholder are taxed at the highest ordinary income rate (not capital gains rates), plus an interest charge that compounds for each year the gain is deemed to have accrued. The U.S. person must also file Form 8621 annually for each PFIC they hold. A QEF (Qualified Electing Fund) election or mark-to-market election can mitigate these consequences, but both require careful planning and timely filing.

Decision tree showing the two PFIC tests and common triggers for Canadian corporations in an estate freeze

The Generation-Skipping Transfer Tax

There’s one more U.S. tax that can apply when your freeze involves multi-generational planning: the generation-skipping transfer tax, or GSTT. It’s a separate federal tax — at a flat rate of 40% — imposed on transfers that skip a generation, either directly to grandchildren or through a trust that benefits them.

In a typical Canadian estate freeze, the family trust includes grandchildren among the potential beneficiaries. Under Canadian law, this is routine and tax-efficient — it’s one of the reasons we use trusts in the first place. Under U.S. law, any distribution from the trust to a grandchild (a “skip person”) can trigger the GSTT in addition to any other gift or estate tax that applies. The tax is calculated on the full value of the distribution, not just the gain.

The GSTT has its own separate $15 million exemption for 2026, matching the federal estate and gift tax exemption. However, unlike the estate tax exemption, unused GSTT exemption does not port to a surviving spouse — it is lost at death. The exemption must be affirmatively allocated to specific transfers or trusts, typically on the gift tax return (Form 709). Failing to allocate the exemption properly can result in the full 40% GSTT applying to distributions that could have been sheltered.

The Canada-U.S. Tax Treaty: What It Does and Does Not Do

Article XXIX B of the Canada-U.S. Tax Treaty is the primary mechanism for reducing double taxation on estates. It helps — but it has significant limitations that business owners and their advisors need to understand before counting on it.

For U.S. citizens living in Canada: the full unified credit ($15 million exemption for 2026) is available against U.S. estate tax on worldwide assets. Canada provides a credit under paragraph 6 of Article XXIX B for U.S. estate or inheritance taxes paid on property situated in the United States. This credit reduces Canadian tax but applies only to the U.S.-situs portion of the estate.

For Canadian residents who are not U.S. citizens: the Treaty provides a pro rata share of the unified credit. The pro rata amount is based on the ratio of U.S.-situs assets to worldwide assets. If only 10% of the estate consists of U.S.-situs property, the available credit is 10% of the full unified credit. This can leave a significant estate tax exposure on non-U.S.-situs assets.

The Treaty also provides a marital credit under Article XXIX B that may allow additional relief when the surviving spouse is a Canadian resident. But this credit has its own conditions and limitations. The bottom line: the Treaty is a tool, not a complete solution. Relying on it without expert guidance is risky.

When One Spouse Is a U.S. Person

One of the most common cross-border scenarios we see is a married couple where one spouse is a U.S. person and the other is not. This single fact creates a layer of complexity that’s easy to overlook and difficult to unwind once the freeze is in place.

The U.S. unlimited marital deduction allows tax-free transfers of any amount between spouses — but only if the receiving spouse is a U.S. citizen. If the surviving spouse is a Canadian resident who is not a U.S. citizen, the unlimited marital deduction does not apply. Instead, transfers to the non-citizen spouse are limited to an annual exclusion of approximately $194,000 (2026, indexed). Any amount above this threshold is treated as a taxable gift.

For estate freeze purposes, this means that if the freezor is a U.S. citizen and their spouse is a Canadian resident (not a U.S. citizen), even routine transfers between spouses — such as transferring preferred shares to the spouse’s holding company or adding the spouse as a shareholder — can trigger gift tax consequences. The freeze must be structured to avoid inadvertent gifts that exceed the annual exclusion.

The Qualified Domestic Trust (QDOT). When a U.S. person dies and the surviving spouse is not a U.S. citizen, the estate tax marital deduction is only available if the assets pass to a Qualified Domestic Trust. A QDOT requires that at least one trustee be a U.S. citizen or U.S. domestic corporation, that the trust meets certain regulatory requirements, and that distributions of principal from the trust are subject to U.S. estate tax when made. Without a QDOT, the full value of assets passing to the non-citizen surviving spouse may be subject to immediate estate tax.

Seeing It in Practice: A Cross-Border Example

Let’s walk through a scenario to see how all of this comes together. A dual citizen — Canadian and American — owns a Canadian private corporation worth $5 million and implements a standard estate freeze.

Side-by-side comparison showing how Canada and the U.S. treat the same estate freeze transaction

At the Freeze

On the Canadian side, the section 85(1) rollover proceeds without triggering immediate tax. The freezor receives preferred shares, and the family trust subscribes for growth common shares at nominal value. No gift tax applies because Canada has no such concept. On the U.S. side, the IRS may treat the transfer of growth potential as a taxable gift. If that growth potential is valued at $5 million, the freezor consumes $5 million of their $15 million lifetime exemption. Form 709 must be filed. Same transaction, very different treatment.

Ongoing Operations

In Canada, the family trust is a separate taxpayer. Income can be allocated to beneficiaries, who report it on their own returns. In the U.S., the trust may be classified as a grantor trust, with all income taxed to the freezor personally — regardless of how income is allocated in Canada. If the corporation is classified as a PFIC, distributions to any U.S.-person beneficiary face punitive tax rates plus interest charges. And the U.S. side requires annual filing of Forms 3520, 3520-A, and potentially 8621. The compliance burden alone can run $15,000 to $25,000 per year.

At Death

When the freezor dies, Canada deems the preferred shares disposed of at fair market value under subsection 70(5). Assuming a nominal adjusted cost base (common for many private company owners), the capital gain is approximately $5 million. At the 50% inclusion rate and Ontario’s top combined rate of approximately 53.53%, the Canadian tax on the $2.5 million taxable capital gain is roughly $1.34 million. As discussed in Valuation — The Make-or-Break Step, the valuation at the date of death must be independent and defensible — both the CRA and the IRS will scrutinize it.

At the same time, the U.S. includes the same preferred shares in the freezor’s estate. In this $5 million scenario, the freezor used $5 million of their $15 million lifetime exemption at the time of the freeze, leaving $10 million. The remaining exemption covers the estate — no U.S. estate tax. But Form 706 must still be filed. And the Canada-U.S. Tax Treaty provides a credit mechanism under Article XXIX B to reduce double taxation on amounts that are taxable in both countries.

Practical Guidance

Four-step practical checklist for implementing an estate freeze with U.S. connections

Step 1: Identify All U.S. Connections Early

Before implementing any estate freeze, ask every person who will be involved — the freezor, their spouse, every beneficiary, every potential trustee — whether they have any U.S. tax obligations. Include dual citizens, former green card holders, and anyone who spends significant time in the United States. This needs to happen at the very beginning of the planning process, not halfway through. A single U.S. person anywhere in the chain can change the entire approach.

Step 2: Engage a Cross-Border Tax Specialist

Your regular Canadian tax advisor — even a very good one — may not be familiar with the U.S. rules that apply to estate freezes. You need someone who understands both the Canadian Income Tax Act and the U.S. Internal Revenue Code, and who can spot the interactions between the two systems. As we discuss in Building Your Advisory Team, each professional on the team has a distinct role — but cross-border work requires an additional specialist who is fluent in both regimes. The cost of that advice is a fraction of the cost of getting it wrong.

Step 3: Consider Alternative Structures

In some cases, the standard Canadian estate freeze structure — a section 85(1) rollover with a family trust subscribing for growth shares — may simply not be appropriate when U.S. persons are involved. You may need a U.S.-compliant trust structure, specific treaty provisions, a restructured ownership chain, or marital deduction planning under Article XXIX B of the Treaty. The right answer depends on who the U.S. persons are and where they sit in the freeze chain.

Step 4: Calendar All U.S. Reporting Obligations

U.S. persons involved in a foreign trust face extensive annual reporting obligations: Form 709 (gift tax return for the year of the freeze), Forms 3520 and 3520-A (foreign trust information returns), Form 8621 (PFIC annual information return), FBAR/FinCEN 114 (foreign bank account reporting), and Form 8938 under FATCA. Missing a single filing can trigger penalties that exceed the underlying tax. A compliance calendar needs to be set up at the outset — not as an afterthought.

Already Behind? The IRS Streamlined Filing Compliance Procedures

Many dual citizens living in Canada discover their U.S. filing obligations only when they begin planning an estate freeze. If you’ve never filed U.S. returns, the situation can feel overwhelming — but there is a structured path forward, and it’s more manageable than most people expect.

The IRS offers Streamlined Foreign Offshore Procedures specifically for non-willful non-resident taxpayers. To qualify, the taxpayer must have been a non-resident of the United States for at least one of the three most recent tax years, must not have had a U.S. abode during that period, and the failure to file must have been due to non-willful conduct — meaning negligence, inadvertence, or a good-faith misunderstanding of the law’s requirements.

U.S. Reporting Obligations at a Glance

The reporting burden for U.S. persons involved in a Canadian estate freeze is substantial — and it’s ongoing. The following reference chart summarizes the key forms, who must file them, and what happens if you don’t.

Reference chart showing six key IRS forms, filing requirements, and penalties for U.S. persons in a Canadian estate freeze

These forms are in addition to the standard U.S. individual income tax return (Form 1040). Many of these returns have different due dates and extension rules than the regular tax return. A cross-border specialist should prepare a compliance calendar at the outset of the freeze to ensure nothing is missed.

Timeline showing when each U.S. form is due during the lifecycle of an estate freeze

When a Beneficiary Moves to the United States

Here’s a scenario that comes up more often than you might think: the freeze is implemented with a Canadian family trust holding growth shares for the children, and then one of the children moves to the United States for work, marriage, or school — and stays. This single event can create cascading tax complications for the entire freeze structure.

Flowchart comparing outcomes when growth shares are held in trust versus held directly by an emigrating beneficiary

Canadian Departure Tax

When a Canadian resident ceases to be a resident of Canada, subsection 128.1(4) deems them to have disposed of most of their property at fair market value on the date of departure. If the beneficiary holds growth shares directly (not in a trust), the departure triggers an immediate capital gain on the unrealized appreciation — even though no actual sale occurred and no cash was received. The tax must be paid or secured before the individual leaves.

If the growth shares are held in the family trust (as is typical in most estate freezes), the departure of a beneficiary does not trigger the departure tax on the trust’s shares, because the trust — not the individual — owns the property. However, any future distributions from the trust to the now-U.S.-resident beneficiary will be subject to U.S. tax in the beneficiary’s hands, and the trust will face Canadian withholding tax obligations on distributions to a non-resident.

The PFIC Problem for U.S. Residents

Once the beneficiary becomes a U.S. tax resident, the Canadian corporation whose shares are held by the family trust may be classified as a Passive Foreign Investment Company (PFIC) from the beneficiary’s perspective. A PFIC is any non-U.S. corporation where 75% or more of gross income is passive or 50% or more of assets are passive. Operating companies usually avoid PFIC classification, but holding companies and investment companies almost always trigger it. PFIC classification subjects the U.S. resident to punitive tax rates and complex annual reporting requirements on Form 8621.

Trust Distributions to a U.S. Beneficiary

Canadian withholding tax. When the family trust distributes income to a non-resident beneficiary, the trust must withhold Canadian tax at the default Part XIII rate of 25% (reduced to 15% for most income types under the Canada-U.S. Tax Treaty). Capital gains allocated to a non-resident beneficiary may be exempt from Canadian withholding under the Treaty, but the rules are technical and the trust must file the appropriate NR4 and T3 returns.

U.S. foreign trust reporting. From the U.S. side, the beneficiary must report distributions from the Canadian family trust on Form 3520 annually. The trust itself must file Form 3520-A. If the trust is treated as a “foreign grantor trust” for U.S. purposes, the U.S. beneficiary may be taxed on the trust’s income as it is earned, not when distributed. The penalties for failure to file are severe — the greater of $10,000 or 5% of the gross value of trust assets per year.

What About Renouncing U.S. Citizenship?

Some business owners, upon learning the full scope of U.S. tax exposure, ask the natural question: can I just renounce my U.S. citizenship? It’s a legitimate option — but it comes with its own severe tax consequences that you need to understand before going down that road.

Under IRC §877A, a “covered expatriate” is subject to a mark-to-market exit tax on the day before expatriation. All worldwide assets are deemed sold at fair market value, and the resulting gain is subject to U.S. tax. For 2026, the first $910,000 of unrealized gain is exempt, but everything above that is taxable.

You are classified as a covered expatriate if any one of three tests is met: your net worth is $2 million or more on the date of expatriation (which covers virtually every business owner implementing an estate freeze), your average annual net income tax for the preceding five years exceeds approximately $211,000 (2026, indexed), or you fail to certify full tax compliance for the prior five years on Form 8854.

Insurance Implications When Crossing Borders

Corporate-owned life insurance adds yet another layer to cross-border estate freezes. If the freezor emigrates from Canada, the corporation typically remains a Canadian entity and the life insurance policy remains a Canadian policy. The CDA mechanism continues to function. But the tax treatment of the death benefit and the CDA election on the non-resident shareholder’s side requires careful coordination between both tax systems.

When a Canadian corporation pays a capital dividend to a non-resident shareholder (or a non-resident estate), the dividend is generally not subject to Canadian withholding tax because it is a return of tax-paid capital. However, the CRA may scrutinize whether the CDA balance is accurate and whether the capital dividend election was properly filed. From the U.S. side, the capital dividend may be treated as a distribution from a controlled foreign corporation, with its own reporting requirements.

The 21-Year Deemed Disposition: A Cross-Border Coordination Problem

Canadian family trusts are subject to a deemed disposition of their capital property every 21 years under subsection 104(4) of the Income Tax Act. As we covered in detail in the 21-year rule article, this triggers an immediate capital gain on the unrealized appreciation of the trust’s assets. For estate freezes, it’s a known planning event on the Canadian side.

The problem for cross-border planning is that the U.S. doesn’t recognize the 21-year deemed disposition at all. The IRS has no equivalent rule. From the U.S. perspective, no transaction has occurred — no sale, no distribution, no transfer. This creates a fundamental mismatch between the two systems that affects cost basis, foreign tax credits, and ongoing compliance.

The cost basis mismatch. After the 21-year deemed disposition, the trust’s adjusted cost base for Canadian purposes resets to fair market value. But for U.S. purposes, the original cost basis remains unchanged. If the trust later distributes property to a U.S.-person beneficiary or sells the shares, the Canadian gain will be calculated from the stepped-up 21-year basis, while the U.S. gain will be calculated from the original (much lower) cost basis. The U.S. gain will be substantially larger than the Canadian gain, and the foreign tax credit available to offset the double taxation may not fully cover the difference.

Foreign tax credit complications. When the 21-year deemed disposition triggers Canadian tax, the freezor or trust may pay significant Canadian capital gains tax. A U.S. person who is the grantor of the trust (for U.S. purposes) or a U.S.-person beneficiary may seek to claim a foreign tax credit for the Canadian tax paid. However, because no U.S. taxable event has occurred, there may be no U.S. tax liability against which to apply the credit in that year. The credit may be wasted or require complex carry-forward planning.

U.S. Estate Planning Alternatives: GRATs and IDGTs

In the United States, the estate freeze concept takes different forms than the Canadian share exchange. Two of the most common U.S. freeze-equivalent techniques are the Grantor Retained Annuity Trust (GRAT) and the Intentionally Defective Grantor Trust (IDGT). If your client has a U.S. advisor, these are the structures they’ll likely be discussing — so it’s worth understanding the basics and how they compare to what we do in Canada.

A GRAT is an irrevocable trust to which the grantor transfers assets while retaining the right to receive an annuity for a fixed period. At the end of the term, the remaining assets pass to the beneficiaries. If the assets appreciate faster than the IRS assumed rate (the Section 7520 rate), the excess growth transfers to the beneficiaries free of gift and estate tax. An IDGT is a trust that is treated as "defective" for income tax purposes (so the grantor pays income tax on trust income), but is treated as a completed gift for estate tax purposes (so the assets are excluded from the grantor's estate). The grantor's payment of the trust's income taxes effectively transfers additional wealth to the beneficiaries tax-free.

Section 2036: The Retained Control Risk

A critical difference between U.S. and Canadian planning is IRC Section 2036, which can pull transferred assets back into the transferor's U.S. estate if the transferor retained the right to use, possess, or enjoy the property, or retained the right to designate who may possess or enjoy the property. In the Canadian estate freeze context, this is relevant when a freezor who is also a U.S. person serves as trustee of the family trust. The trustee's discretion over distributions may constitute a "retained interest" under Section 2036, causing the trust assets to be included in the freezor's U.S. estate — negating the freeze entirely from a U.S. estate tax perspective.

Key Takeaways

How to Find a Qualified Cross-Border Specialist

The first question we ask when we’re referring a client to a U.S. tax specialist is simple: have you filed a treaty-based return in the last twelve months? If the answer is no, or if the advisor hesitates, that’s a signal to keep looking. Cross-border work is a specialty within a specialty, and general tax practitioners — even very good ones — can miss the issues that matter most.

Related Articles

How an Estate Freeze Actually Works — The standard Canadian freeze mechanics that create the cross-border complications

The Role of the Family Trust in an Estate Freeze — Why trust structures create unique U.S. reporting obligations

Building Your Advisory Team — Why cross-border work requires a specialist beyond the standard team

Provincial Nuances — Canadian provincial differences that compound cross-border complexity

Cross-border freezes are not a DIY exercise. The rules are too complex, the penalties too severe, and the interactions between the two tax systems too nuanced for anything less than a coordinated team that includes someone who lives and works in the cross-border space.

For definitions of the key terms used in this article — including PFIC, grantor trust, U.S. estate tax, Treaty Article XXIX B, expatriation, and cross-border freeze — see our Key Terms and Definitions reference guide.

Your tax advisor can help you evaluate how this applies to your specific circumstances — for your cross-border freeze — coordinating your Canadian and U.S. obligations from the beginning, before the structure is finalized.

This article is for informational purposes only and does not constitute legal, tax, or financial advice. Estate freezes are complex transactions that require the coordinated involvement of qualified tax, valuation, and legal professionals. Always consult your advisors before acting on any of the information discussed here.