CANADIAN SNOWBIRD TAX SERIES
This article is general educational information about the US estate tax return for nonresidents. It is not tax, legal, or investment advice. The deadlines described below run from the date of death and are unforgiving, and the practical consequence of missing them usually falls on a bereaved family rather than on the person who owned the asset. Confirm your situation with a cross-border advisor and estate counsel qualified in both countries.
By Lucas Wennersten, CFP® (US & Canada), CFA · 11-minute read
The tax is usually zero. The delay is not.
Most Canadian families who end up filing a US estate tax return owe nothing at the end of it. Treaty relief handles the tax. That is the good news, and it is genuinely good.
What surprises them is that the return still has to be filed, and that until the IRS has processed it and issued a clearance document, the US asset is effectively frozen. The condo cannot be sold. The brokerage account will not transfer. The estate cannot be wound up.
That is the real cost of IRS Form 706-NA — not the tax, which is often nil, but the time. And the clock starts on the date of death, which means it has usually been running for weeks before anyone realises the obligation exists.
This post covers who must file, the deadline and the extension, what gets reported, the transfer certificate that actually unlocks the asset, and the sequence an executor should follow. For how the treaty reduces the tax itself, see Article XXIX-B Estate Tax Relief. For the wider picture, start with The Canadian Snowbird Tax Guide.
Who has to file
Form 706-NA is the US estate tax return for the estate of someone who was neither a US citizen nor a US domiciliary at death. For most Canadian snowbirds, that is exactly the description.
The filing obligation is triggered when the value of the deceased’s US-situs assets exceeds US$60,000 at death.
Three things about that threshold matter more than they appear to.
It is measured gross, before any treaty relief. An estate whose treaty-relieved tax will be zero still crosses the filing threshold if the underlying US assets exceed US$60,000. Owing nothing and filing nothing are different things, and this is where the confusion concentrates.
It counts more than real estate. Shares of US corporations are US-situs regardless of where the brokerage account sits — a US stock in a Canadian account still counts. So do tangible items physically in the US. US bank deposits not connected with a US trade or business generally do not.
It is a low bar. US$60,000 has not been adjusted in decades. A modest condo clears it many times over, and so does a moderately sized US equity position that the family thought of as simply “the investments.”
The deadline, and the extension that does not do what people think
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Form 706-NA is generally due nine months after the date of death.
An extension of up to six months is available, requested on IRS Form 4768. Two things about it are widely misunderstood.
It extends the time to file, not the time to pay. Where tax is genuinely owed, interest runs from the original date regardless of the extension.
And it has to be requested before the original deadline passes. An extension is not a remedy discovered afterwards; it is a decision made inside the first nine months, by someone who knew the return existed.
Nine months sounds generous. In practice it is not. A Canadian estate typically spends the first weeks on the funeral, the will, and the provincial process. Then probate. Then the discovery — often from a bank or a realtor rather than an advisor — that the US asset has its own separate requirements. By the time cross-border counsel is engaged, a substantial share of the nine months is gone, and the valuation work has not started.
What actually gets reported
The return has two layers, and the second one is the one families object to.
The US-situs assets, in detail. Each item, described and valued at fair market value as at the date of death. Real property generally needs a formal appraisal — an estimate or a tax assessment will not carry the weight. Securities are valued by a prescribed method rather than by whatever the statement happened to show.
The worldwide gross estate, if treaty relief is being claimed. Article XXIX-B of the Canada-United States Tax Convention pro-rates the credit by the ratio of US-situs assets to worldwide estate, so the denominator has to be established and reported. That means telling the IRS the value of the Ontario house, the RRIFs, the cottage, the private company shares — none of which the United States has any right to tax.
Families consistently find this second layer harder than the first. It is worth naming plainly: the disclosure is the price of the relief. Declining it does not avoid the filing, it just forfeits the credit and leaves you with the US$60,000.
There is also an alternate valuation date election available, allowing assets to be valued six months after death rather than at the date of death. It is not automatic, it applies to the whole estate rather than to selected assets, and it is only advantageous in specific circumstances. It is a decision for the preparer, not a default.
The transfer certificate: the part nobody warns families about
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Here is the mechanism that turns a paperwork obligation into a practical crisis.
US financial institutions and title companies can face liability if they transfer a deceased nonresident’s US-situs assets without confirmation that the estate’s US tax obligations are settled. That confirmation is an IRS transfer certificate.
The certificate is issued after the IRS has processed the estate’s return. Which means the sequence runs: file the 706-NA, wait for processing, receive the certificate, and only then can the custodian release the securities or the title company close the sale.
IRS processing of these returns is measured in many months. Families routinely discover this when they try to sell the condo, or when a brokerage refuses to move an account, and are told the estate needs a document they have never heard of, which depends on a return they have not filed, for a tax they do not owe.
This is the single strongest argument for filing early rather than at the deadline. The nine months is when the return is due. The certificate arrives when the IRS is finished, and every week of delay in filing is a week added to the far end.
It is also the argument for telling your executor in advance. The cost of that conversation is nothing. The cost of skipping it is an estate that cannot be closed while a family waits.
Practical obstacles that add weeks
Several requirements catch Canadian estates that have never dealt with the US system.
- Taxpayer identification numbers. The deceased, and sometimes the executor, may need a US identification number to file. If none exists, one must be applied for — typically on IRS Form W-7 — and that application takes its own time. Discovering this at month eight is a problem.
- Formal appraisals. A date-of-death appraisal of US real property has to be commissioned, and appraisers are not always quick.
- Currency conversion. Canadian assets reported in the worldwide estate must be converted, using a defensible rate and method, and documented.
- Cross-border preparer capacity. The population of preparers who handle 706-NA competently is small. In the months around a filing season they are not immediately available.
- Coordination with the Canadian final return. The Canada Revenue Agency deemed disposition on the Canadian side and the US estate tax interact, and the order in which they are handled affects the credits available.
None of these is difficult on its own. Together they explain why nine months is tighter than it sounds.
What happens if it is not filed
Two distinct consequences, and they compound.
The treaty relief is at risk. Article XXIX-B relief is claimed on the return, with a treaty-based position disclosure on Form 8833. Relief claimed on a late return is at the discretion of the IRS. Relief never claimed does not exist, and the estate falls back to the US$60,000.
The asset stays locked. No return means no processing, no transfer certificate, and no release. The property cannot be sold and the account cannot be moved. Penalties and interest are real, but for most families it is the freeze that does the damage — an estate that cannot be distributed, sometimes for years.
The asymmetry is worth stating plainly. Filing costs a preparer’s fee and a disclosure the family dislikes. Not filing costs the relief, the timeline, and the family’s ability to close the estate at all.
A worked example: nine months is not nine months
A Canadian widow dies in March owning a US$700,000 condo in Scottsdale and a US equity position in her Canadian brokerage account. Her worldwide estate is roughly CA$3 million. Her son in Ottawa is executor.
March to May. Funeral, the will, initial provincial steps. Nobody mentions the United States.
June. The son contacts a realtor about listing the condo and is told the sale cannot close without an IRS transfer certificate. This is the first he has heard of any of it.
July. A cross-border preparer is engaged. They explain the return is due in December, that a date-of-death appraisal is required, that the US equities count as US-situs even in a Canadian account, and that claiming treaty relief means reporting the entire Canadian estate.
August to October. Appraisal, valuations, currency conversion, identification numbers. The family debates the worldwide disclosure and eventually accepts it.
November. The return is filed, comfortably inside the deadline. The treaty pro-ration reduces the tax to nil.
The following year. The transfer certificate arrives. The condo can finally be listed.
Nothing went wrong. No deadline was missed and no tax was owed. The estate still took well over a year to unlock, because the clock that mattered was not the filing deadline — it was the processing queue that starts only once you file.
Had the son known in March, the whole sequence would have moved several months earlier.
A sequencing checklist for the executor
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- Identify US-situs assets immediately. Real property, US-incorporated shares wherever held, tangible property in the US. If the total looks like it exceeds US$60,000, assume a filing obligation.
- Note the date of death and count nine months forward. Write that date down. Everything else works backwards from it.
- Engage a cross-border preparer early. Capacity is limited and the work is sequential.
- Commission the date-of-death appraisal for any US real property. This has the longest lead time.
- Confirm identification numbers for the deceased and the executor. Apply immediately if missing.
- Decide on treaty relief and the worldwide disclosure it requires. Deciding late compresses everything after it.
- Coordinate with the Canadian final return and the deemed disposition.
- File as early as the work allows, not at the deadline. The transfer certificate queue begins at filing.
Steps 1 and 8 are the ones that change the timeline. Step 4 is the one that most often blocks it.
Five mistakes we see most
- Assuming no tax means no return. The filing trigger is US$60,000 in US-situs assets, measured gross and before treaty relief.
- Not knowing about the transfer certificate. The asset stays locked until the IRS processes the return, however small the tax.
- Treating nine months as ample. Appraisals, identification numbers, valuations and preparer capacity consume it quickly, and the clock starts at death.
- Requesting the extension too late, or expecting it to extend payment. It must be filed before the original deadline, and it extends filing only.
- Forgetting US shares held in Canadian accounts. Situs follows where the issuer is incorporated, not where the account is.
Frequently asked questions
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Who has to file Form 706-NA?
The executor of the estate of someone who was neither a US citizen nor a US domiciliary at death, where the deceased’s US-situs assets exceeded US$60,000. For most Canadian snowbirds who owned US property, that describes their estate.
Do I have to file if the treaty reduces the tax to zero?
Generally yes. The filing threshold is measured on gross US-situs assets before treaty relief, not on the tax remaining after it. The relief itself is only available on a filed return, so filing is what produces the zero rather than a reason to skip it.
When is Form 706-NA due?
Generally nine months after the date of death. An extension of up to six months can be requested on Form 4768, but it must be requested before the original deadline and it extends the time to file rather than the time to pay.
What is a transfer certificate and why does it matter?
It is an IRS document confirming the estate’s US tax obligations are settled. US custodians and title companies generally require it before releasing or transferring a deceased nonresident’s US-situs assets. It is issued only after the IRS processes the return, which is why filing early matters more than filing on time.
How long does it take to get the transfer certificate?
Processing is measured in many months, and the queue only begins when the return is filed. Practically, this means the US asset is not available to the estate for a considerable period after death even where everything is done correctly and no tax is owed.
Do US shares in a Canadian brokerage account count?
Generally yes. For US estate tax purposes, situs follows where the issuing corporation is incorporated, not where the account or custodian is located. A US stock in a Canadian account is US-situs. A US bank deposit not connected with a US trade or business generally is not.
Does claiming treaty relief require reporting my Canadian assets?
Yes. The Article XXIX-B credit is pro-rated by the ratio of US-situs assets to the worldwide gross estate, so the worldwide figure must be established and reported. Those Canadian assets are disclosed to compute a ratio, not because the US can tax them.
What is the alternate valuation date?
An election to value the estate six months after death rather than at the date of death. It is not automatic, applies to the estate as a whole rather than selected assets, and is only advantageous in particular circumstances. Treat it as a preparer decision.
What identification numbers are needed?
A US taxpayer identification number may be required for the deceased and sometimes the executor. Where none exists, an application must be made and it takes its own time — which is why this should be checked at the start rather than discovered near the deadline.
What happens if the return is filed late?
Treaty relief on a late return is at the discretion of the IRS, so the estate risks falling back to the US$60,000 exemption. Penalties and interest may apply where tax is owed. And because the transfer certificate depends on processing, a late filing pushes the release of the asset further out.
Can the estate sell the US property before filing?
In practice, usually not. Title companies generally require the transfer certificate before closing on a deceased nonresident’s US real property. This catches families who assumed they could sell the condo to fund the estate’s obligations.
More from the Canadian Snowbird Tax Series
- The Canadian Snowbird Tax Guide — the pillar: residency, estate exposure, reporting, healthcare
- Form 8840 & the Closer Connection Exception — staying a nonresident while wintering south
- Article XXIX-B Estate Tax Relief — how the treaty reduces the bill
- Holding U.S. Property Through a Holdco — structures, and what they cost you
- Snowbird Healthcare Coverage — the provincial clock, province by province
- Canada-to-Arizona Relocation — when the winter stay becomes a move
For the high-net-worth framing of the underlying exposure, see what the current US estate tax law means for high-net-worth Canadians. Every form named here is in our cross-border tax forms hub. The Canadian side of the same death — the deemed disposition — is covered in Canadian deemed disposition vs. U.S. estate and gift tax.
Almost every difficulty in this post is a timing problem rather than a tax problem, and almost all of it is solved by one conversation held while everyone is still alive. Our cross-border estate planning work starts by making sure your executor knows what they will be holding.
If you own US property, the single most useful thing you can do is write down what your executor will need to know — and check that they know it exists. Book a complimentary consultation and we will map your US-situs assets, model the filing, and put the sequence in writing before anyone needs it.
