US Estate Tax Exposure for Ontario Residents Who Own US Property

A Florida condo. An Arizona winter home. A brokerage account holding US-listed stocks. Plenty of Ontario residents own property connected to the United States, and many are surprised to learn that this can expose their estate to US estate tax at death — a completely separate system from anything administered in Ontario or by the Canada Revenue Agency.

This is one of the more genuinely complex corners of estate planning, because it sits at the intersection of two countries' tax systems. This article explains the general shape of the issue in plain language. It is not a substitute for advice from a professional who works specifically in Canada–US cross-border estate tax — and given how much this area changes, that advice should come from someone current on today's rules, not last year's.

Why a Canadian Resident Can Owe US Estate Tax at All

The United States taxes estates based partly on where certain property is located — not only on the citizenship or residency of the person who died. Property considered to have a US "situs" (location) — which can include US real estate and, depending on the circumstances, certain US securities — can fall within the reach of the US estate tax system even when the owner was a Canadian resident and citizen who never lived in the US.

This is genuinely separate from Canada's approach. Canada doesn't have an estate tax in the way the US does; instead, Canada taxes a deceased person through a deemed disposition of their property for capital gains purposes. A Canadian resident who owns US property can, in principle, face exposure to both systems, applied on different logic, calculated differently, and potentially requiring separate filings.

What Kind of Property Can Trigger This

Property that can potentially be treated as US-situated for these purposes generally includes things like:

• US real estate (a vacation home, condo, or investment property)
• Tangible personal property physically located in the US
• Shares of US corporations, including many US-listed stocks, even when held in a Canadian brokerage account

Whether a specific asset is treated as US-situated, and how any resulting exposure is calculated or reduced, depends on detailed rules — including a Canada–US tax treaty that can provide relief in some circumstances. Getting this analysis right requires someone who actively practices in this specific cross-border area.

Why You Shouldn't Rely on a Number You Read Online

US estate tax exemption thresholds, rates, and the treaty relief mechanisms available to Canadian residents have changed over time and are the subject of periodic US legislative change. Any specific dollar figure or percentage you might see quoted elsewhere can be — and often is — out of date by the time you read it. This is exactly the kind of figure this article deliberately does not state: get the current numbers from a cross-border tax professional at the time you're actually planning, not from an article written at an earlier point.

What Ontario Residents With US Property Generally Need to Think About

1. Get a proper cross-border assessment. A cross-border tax professional (often an accountant or lawyer with specific US estate tax expertise) can assess whether your specific assets create exposure, and roughly how significant it might be.
2. Coordinate your Canadian and US planning. Your Ontario will, any US-specific estate documents, and your overall asset structure should work together, not be planned in isolation from each other.
3. Consider how you hold US property. The way title is held — individually, jointly, through a trust, or through a corporate structure — can materially change the analysis. This is a decision to make with proper advice, not a do-it-yourself structuring exercise.
4. Review your plan periodically. Because the rules in this area shift, a cross-border plan that made sense several years ago may need a fresh look, particularly around major US tax legislative changes.
5. Don't assume small holdings are automatically exempt. Exposure can depend on total US-situated assets and current thresholds — assumptions based on outdated figures, or on someone else's situation, aren't a safe basis for your own plan.

Where Treadstone Law Fits In

Treadstone Law is an Ontario law firm, and we handle the Canadian side of your estate plan — your Ontario will, powers of attorney, and overall estate structuring. For clients with US property or other cross-border exposure, we work alongside cross-border tax professionals to make sure your Ontario documents are coordinated with the US-side planning, rather than drafted in a vacuum.

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