Form 706-NA in Detail: When a Canadian Estate Owes the US a Return, What Counts as US-Situs, and How the Treaty Credit Works

Short version: U.S. Estate Tax for Canadians: U.S. Property at Death

Form 706-NA is the US estate tax return for a deceased nonresident who was not a US citizen, and the trigger is small: US-situated assets over $60,000 at death. That is not $60,000 of tax — it is $60,000 of gross US-situs value, a threshold one Florida condo or one respectable brokerage account clears easily. The statutory exemption for a nonresident is only the credit equivalent of that $60,000; without more, US estate tax at rates up to 40% would apply to the excess. The Canada-US treaty supplies the more: Article XXIX B gives a Canadian resident's estate a unified credit pro-rated by the share of the worldwide estate that is US-situs, plus a marital credit for property passing to the surviving spouse. For most Canadian estates the treaty credit eliminates the tax entirely — but the credit is claimed on the return, so the return must be filed, with a worldwide estate disclosure attached, and the estate's US assets are frozen behind a transfer certificate until the IRS is satisfied.

Key takeaways

• Who files: the executor of a deceased non-US-citizen nonresident whose US-situs assets exceeded $60,000 at death. Due nine months after death (six-month extension on Form 4768).
• US-situs includes: US real estate; tangible property located in the US; shares of US corporations wherever the certificates or the account sit — a US stock inside a Canadian brokerage account or an RRSP is US-situs. Excluded: US bank deposits not connected to a US business, portfolio debt obligations, life insurance proceeds on the nonresident's life, and, in practice for most Canadians, US mutual-fund-type regulated investment company holdings only per the specific rules — the classification is line by line.
• The treaty pro-ration: the estate claims a unified credit equal to the full US exemption's credit multiplied by US-situs assets over the worldwide gross estate. With the exemption at $15 million (2026), a Canadian estate under $15 million worldwide typically owes nothing — but only by filing and disclosing the worldwide numbers.
• The marital credit (Article XXIX B(3)) doubles the relief for property passing to a surviving spouse where the conditions are met — an alternative to a QDOT for the Canadian couple.
• Canada's side of the same death: the deemed disposition taxes the accrued gain on those same US assets; XXIX B allows the US estate tax, where any survives, to be credited against the Canadian tax arising from the US property — the two countries' taxes on one death are netted rather than stacked.
• Transfer certificates: US institutions generally will not release a nonresident decedent's assets without one; it is issued after the 706-NA (or a no-liability showing) is processed. Processing takes months — the estate timeline should assume it.

The situs analysis is the whole return

The return stands or falls on classification. The same $500,000 can be exempt (a US bank CD), US-situs (Apple shares), or arguable (certain funds and ETFs). Canadian holding structures matter: US stocks held through a Canadian mutual fund trust or a Canadian corporation are generally not US-situs to the individual — which is why Canadians with large US equity exposure and estates above the exemption often interpose Canadian funds or a holding company; and why the executor's first task is a statement-by-statement situs schedule at date-of-death values, in US dollars.

The disclosure trade

The pro-rated credit prices in disclosure: the estate reports the worldwide gross estate to the IRS to compute the ratio. Executors are sometimes reluctant. The alternative is worse — without the treaty election the estate gets the bare $60,000 equivalent and a real tax bill. For an estate whose worldwide value is a multiple of the US exemption, the pro-rated credit shrinks and actual US tax emerges even for Canadians; that is the population for whom lifetime restructuring of US-situs exposure is worth real money.

Worked example

A Burlington, Ontario widow dies holding a $700,000 Naples condo, $300,000 of US stocks in her Canadian brokerage account, and a worldwide estate of $5 million; everything passes to her two children. US-situs assets: $1 million — the 706-NA is required. Tentative US estate tax on $1 million is about $345,800 under the rate table. Pro-rated unified credit: the full credit (about $5.9 million against a $15 million exemption) times $1M/$5M = about $1.19 million of credit — far exceeding the tentative tax. US estate tax: zero. No marital credit is needed (no surviving spouse). The estate still: files the 706-NA with the worldwide disclosure nine months out, obtains transfer certificates before the brokerage releases the stocks, and reports the deemed-disposition gains on the condo and the stocks on her final T1 in Canada, where the actual tax on this death is paid. Skip the filing and the estate faces the statutory-only exemption, penalties on a late 706-NA, and a condo that cannot be retitled cleanly.

Official sources

The IRS states that an estate must file Form 706-NA "if the fair market value at death of the decedent's U.S.-situated assets exceeds $60,000," and describes which assets are treated as situated in the United States. — Internal Revenue Service, Some nonresidents with U.S. assets must file estate tax returns, https://www.irs.gov/individuals/international-taxpayers/some-nonresidents-with-us-assets-must-file-estate-tax-returns

Article XXIX B provides relief from double taxation at death, including a pro-rated unified credit for a Canadian-resident decedent — the credit "reduced by the proportion of the unified credit... as the value of property situated in the United States bears to the value of his worldwide estate" — an additional marital credit for property passing to a surviving spouse, and foreign tax credit coordination between the US estate tax and Canadian income tax arising on death. — Canada-United States Tax Convention, Article XXIX B, https://www.canada.ca/en/department-finance/programs/tax-policy/tax-treaties/country/united-states-america-convention-consolidated-1980-1983-1984-1995-1997.html

The IRS explains that a transfer certificate is issued for the estate of a nonresident decedent once the IRS is satisfied that the US estate tax has been paid or that the estate is not liable, and that institutions holding the decedent's US assets generally require the certificate before releasing them. — Internal Revenue Service, Transfer certificate filing requirements for the estates of nonresidents not citizens of the United States, https://www.irs.gov/businesses/small-businesses-self-employed/transfer-certificate-filing-requirements-for-the-estates-of-nonresidents-not-citizens-of-the-united-states

Practitioner note

Every Canadian snowbird estate we see hits the same surprise in the same order: the return is required at $60,000, the treaty makes the tax zero, and the transfer certificate makes the timeline long. The planning conversation is better held while the client is alive — the situs schedule that takes the executor three months to reconstruct takes the owner one afternoon.

See also: Browse every cross-border tax topic guide, organized by situation.

Next step

Fairlight prepares the 706-NA with the treaty credit computations, the situs schedule, and the transfer certificate applications, coordinated with the Canadian final return. See cross-border pricing or book a call.