Deemed disposition on death in Canada vs US stepped-up basis

When a Canadian resident dies, Canada taxes every dollar of unrealized capital gain as if the person sold everything the day before death. When a US person inherits those same assets, the US hands them a fresh cost basis at fair market value, wiping out the gain for American tax purposes. Canada collects tax on the gain, the US pretends the gain never existed, and no mechanism cleanly credits one country’s tax against the other’s. This is one of the most expensive mismatches in cross-border tax, and it catches families off guard because both rules, taken individually, make perfect sense. Together, they create a gap that the treaty only partially fills.

What happens to capital gains at death in Canada?

Canada doesn’t have an inheritance tax or a federal estate tax. What it has instead is a deemed disposition at death. Under ITA 70(5), a deceased taxpayer is treated as having sold all capital property at fair market value immediately before death. Any accrued gain goes on the terminal return, and the estate pays the tax.

Here’s how the mechanics work with an example. Say someone bought shares for $200,000 and they’re worth $800,000 at death. ITA 70(5) creates a deemed disposition at $800,000, producing a $600,000 capital gain. Under ITA 38, only 50% of a capital gain is included in income (the “taxable capital gain”), so $300,000 hits the terminal return. At a combined federal-provincial marginal rate around 50%, that’s roughly $150,000 in tax the estate owes.

This applies to everything the deceased owned: publicly traded shares, rental properties, private company shares, artwork worth more than $1,000, and any other capital property. The principal residence exemption eliminates the gain on the deceased’s home, which is usually the biggest single asset. But everything else gets caught.

The deemed disposition doesn’t care whether the estate actually sells the assets. The tax fires regardless. The estate might distribute the shares in-kind to the heirs, and Canada still collects on the accrued gain as of the date of death. For a deeper look at how Canada’s system works on death, see the inheritance tax guide.

How does the US stepped-up basis work?

The US takes the opposite approach. Under IRC 1014(a), heirs receive inherited property with a cost basis equal to its fair market value at the date of death. The gain that accrued during the deceased’s lifetime vanishes for US income tax purposes entirely.

Using the same example: shares bought for $200,000, worth $800,000 at death. A US heir inherits those shares with a basis of $800,000. If they sell immediately, the US gain is zero. If they hold and the shares rise to $900,000 before selling, the US gain is only $100,000 (the post-death appreciation). The $600,000 of pre-death gain is gone, permanently.

This isn’t a deferral; it’s an elimination. The gain that accrued during the deceased’s lifetime will never be taxed by the US. Congress designed this as a complement to the US estate tax system: the estate potentially pays estate tax on the full value at death, and in exchange, the heir gets a clean basis. Whether you agree with the policy or not, the mechanics are clear, and they’re the exact opposite of what Canada does.

The stepped-up basis applies to all property acquired from a decedent, with a few narrow exceptions (income in respect of a decedent items like IRAs and deferred compensation don’t get the step-up). It applies regardless of whether the estate actually owes US estate tax, regardless of whether the deceased was a US citizen, resident, or nonresident, and regardless of the heir’s citizenship. That universality is what makes the cross-border mismatch so persistent.

Why does this create a double-tax problem?

When a Canadian resident dies and a US person inherits the assets, both rules fire on the same property at the same time. Canada taxes the unrealized gain on the terminal return. The US gives the heir a basis equal to FMV, meaning the heir’s eventual sale won’t reflect the gain Canada already taxed. The Canadian tax becomes a permanent, uncredited cost.

Here’s why it’s permanent. For the US heir to use a foreign tax credit to offset the Canadian tax, they’d need US tax liability on the same income. But they don’t have any. The stepped-up basis means the US sees no gain. No gain, no tax, no liability to credit against. The Canadian tax the estate paid just sits there as a cost the family absorbs with no relief from either country.

The problem also runs the other direction, though less commonly. If a US citizen dies while living in Canada, the US estate might owe estate tax (if above the exemption), and Canada will tax the deemed disposition. The US estate tax guide for Canadians covers that side. But the basis mismatch is the more common trap because it affects every cross-border estate with appreciated assets, not just those above the US estate tax threshold.

What’s the spousal rollover under ITA 70(6)?

The spousal rollover is Canada’s main deferral tool on death. Under ITA 70(6), when capital property passes to a surviving spouse or common-law partner (or to a qualifying spousal trust), the deemed disposition doesn’t fire. The property transfers at the deceased’s adjusted cost base, and no gain is triggered until the surviving spouse sells or dies.

This is automatic. The executor doesn’t need to elect into it; rather, the executor can elect out of it (to trigger the gain early if, for example, the deceased has losses or credits that would offset the gain). In most cases, the rollover is the right default because it preserves liquidity for the surviving spouse and keeps the estate’s cash intact.

For cross-border families, the rollover buys time but doesn’t fix the structural problem. If the surviving Canadian spouse eventually dies and the assets pass to US beneficiaries, the same deemed disposition fires at the second death, and the same stepped-up basis applies on the US side. The deferral gives the family a planning window, though. During that window, the surviving spouse can use strategies like estate freezes or alter ego trusts to manage the eventual tax hit, restructure holdings to take advantage of the LCGE on qualifying shares, or put life insurance in place to cover the bill when it comes due.

Can foreign tax credits fix the mismatch?

In theory, foreign tax credits exist to prevent double taxation. Canada allows a credit under ITA 126 for foreign taxes paid on foreign-source income, and the US allows credits under IRC 901. In practice, the deemed disposition mismatch makes these credits difficult to use because the two systems don’t line up.

The core problem is timing and character. Canada’s deemed disposition is an income tax event that occurs on the terminal return for the year of death. The US stepped-up basis means there’s no corresponding US income tax event at that time. For a foreign tax credit to work, you need tax in one country that corresponds to income in the other country, in the same year, of the same character. When the US sees no income, there’s nothing to credit against.

There’s also a character mismatch. Canada treats the deemed disposition as a capital gain (income tax). If the US imposes estate tax on the same assets, that’s a transfer tax, a different category. The foreign tax credit rules in both countries limit credits to the same category. IRC 904 limits the US foreign tax credit to the US tax attributable to foreign-source income in the same basket, and the basket for capital gains doesn’t contain income that was eliminated by the stepped-up basis.

In some limited cases, a partial credit is available. If the deceased was a US citizen living in Canada, the estate might claim the Canadian tax on the deemed disposition as a credit against US estate tax liability (under treaty provisions). But this requires the estate to actually owe US estate tax, and the credit is capped by the IRC 904 limitation, which prevents it from exceeding the US tax on that income. The guide on penalty coordination when you owe both countries covers some of the practical mechanics when both CRA and IRS are collecting simultaneously.

Does the treaty solve the double taxation?

The US-Canada tax treaty (Article XXIX-B) provides relief for cross-border estates, but it doesn’t directly fix the basis mismatch. The treaty’s main tool is a pro-rata unified credit that reduces or eliminates US estate tax for Canadian residents with US-situs assets. It doesn’t address the income tax mismatch on deemed dispositions.

Here’s what Article XXIX-B actually does. A Canadian resident who isn’t a US citizen gets access to the same unified credit a US citizen would receive, but only in proportion to their US-situs assets relative to their worldwide estate. If a Canadian’s worldwide estate is $5 million and $1 million consists of US stocks, the Canadian estate gets 20% of the full US unified credit. For most Canadian estates below the US exemption threshold, this eliminates US estate tax entirely. That’s a real benefit, but it solves a different problem than the one this article is about.

The treaty also contains a provision (Article XXIX-B, paragraph 6) that allows a credit for certain taxes imposed by one country against the tax of the other on the same property. In practice, this credit is limited and formulaic. It doesn’t convert a Canadian income tax into something the US heir can use as a foreign tax credit against US income tax. The structural gap between income tax (Canada) and transfer tax or no tax at all (US, because of the stepped-up basis) can’t be closed by a treaty provision designed for overlapping taxes.

For the full picture of how the treaty works across all its provisions, see the US-Canada tax treaty guide.

What about the capital gains reserve?

ITA 72(2) allows the legal representative to claim a capital gains reserve on the terminal return when the full proceeds from the deemed disposition aren’t receivable in the year of death. This can spread the gain over multiple years, softening the tax hit on the estate.

Normally, ITA 72(1) says no reserves can be claimed in the year of death. Section 72(2) creates an exception: if the property passes to beneficiaries who will include the deferred gain on their own returns in subsequent years, the estate can claim the reserve that would otherwise have been available under ITA 40(1)(a)(iii). The beneficiary picks up the deferred portion over subsequent tax years, maintaining the capital gain character.

This doesn’t solve the cross-border mismatch, but it eases the cash flow problem. If the estate doesn’t have liquid assets to pay the full deemed disposition tax in the year of death, spreading the gain over several years keeps the estate from having to sell assets at a loss or borrow at high rates to cover the CRA bill. For estates with large illiquid holdings (private company shares, real estate), the reserve can be the difference between an orderly distribution and a fire sale.

How does the LCGE apply at death?

The lifetime capital gains exemption under ITA 110.6 can shelter a substantial amount of capital gains on qualifying property. For 2026, the exemption covers up to $1,250,000 in capital gains on qualifying small business corporation (QSBC) shares and qualifying farm or fishing property.

If the deceased held QSBC shares at death, the deemed disposition gain can be offset (fully or partially) by the LCGE, claimed on the terminal return. To qualify, the shares must meet the QSBC test at the time of death: a Canadian-controlled private corporation with at least 90% of assets used in active business in Canada at the time of disposition, and the shares must have been held for at least 24 months with more than 50% of assets used in active business throughout that period.

For cross-border families, the LCGE is especially valuable because it directly reduces the Canadian tax that would otherwise become an uncredited cost. If David in the earlier example had held QSBC shares instead of publicly traded stocks, and his $600,000 capital gain fell within the LCGE limit, the exemption could shelter the entire gain, reducing the Canadian tax to zero. No Canadian tax means no mismatch, no dead cost to the estate. The post-mortem pipeline guide covers related strategies for private company shares on death, including the ITA 164(6) election that can eliminate double taxation between the corporation and the estate when the LCGE isn’t available or isn’t enough.

Can life insurance fund the Canadian tax bill?

Life insurance is one of the most practical tools for covering the deemed disposition tax at death. The death benefit is received tax-free in Canada, and if a named beneficiary (rather than the estate) is designated, the payout also bypasses probate. The proceeds give the family cash to pay CRA without forcing a sale of the deceased’s investments or real estate at a bad time.

The math is usually compelling. If the projected deemed disposition tax is $150,000, a term or permanent policy with a $150,000 (or larger) death benefit covers the bill outright. The premiums during the insured’s lifetime are typically a fraction of the eventual tax. For older taxpayers or those with health issues, insurance costs go up, but even an expensive policy can be cheaper than the alternative: selling illiquid assets under time pressure, or the family absorbing the tax as a permanent loss with no credit on the US side.

For cross-border families, structuring the policy correctly matters. The life insurance cross-border guide covers the specific tax treatment on both sides. In the US, life insurance death benefits are generally excluded from the beneficiary’s gross income under IRC 101(a), though the policy’s cash value may be included in the deceased’s US gross estate for estate tax purposes if the deceased held incidents of ownership. The ownership structure (personal, corporate, or trust-held) affects both the Canadian and US tax treatment, so this isn’t a buy-and-forget decision.

What does the executor file in Canada?

The executor (CRA calls this the “legal representative”) files a terminal T1 return for the year of death, reporting all income from January 1 through the date of death. That includes the deemed capital gains under ITA 70(5), any RRSP/RRIF income inclusions, employment income, and all other sources. The filing deadline is the later of six months after death or the normal April 30 deadline.

The terminal return is also where the executor claims any available offsets: the LCGE on qualifying shares, charitable donation credits (no 75%-of-income cap in the year of death and the preceding year), unused capital losses from prior years, and the capital gains reserve under ITA 72(2) if applicable. The executor can also file up to three optional returns (rights or things, partner/proprietor income, and income from a testamentary trust) to split income and access the graduated rate brackets more than once.

Beyond the terminal return, the executor should request a clearance certificate (CRA Form TX19) before distributing the estate’s assets. Without the clearance certificate, the executor is personally liable for any tax the estate owes. If the deceased held US assets or had US-connected beneficiaries, the executor needs to coordinate with RRSP/RRIF beneficiary designation rules and joint tenancy provisions that affect what shows up on the terminal return versus what passes outside the estate. The guide on what the estate actually owes covers the executor’s obligations when CRA or IRS debt exists.

What does the executor file in the US?

If the deceased was a US citizen or green card holder, the executor files a final Form 1040 for the year of death, reporting income up to the date of death. If the estate’s gross value exceeds the filing threshold ($15 million for 2026, after the One Big Beautiful Bill Act made the higher exemption permanent), the executor also files Form 706, the US estate tax return.

For a Canadian resident who was not a US citizen or green card holder, the US filing obligations depend on whether the deceased held US-situs assets (US real estate, US stocks, tangible personal property in the US). If those assets exceed $60,000, the executor must file Form 706-NA, the nonresident estate tax return. The treaty’s pro-rata unified credit may eliminate the actual tax owed, but the filing obligation remains. A treaty-based return position (claiming the pro-rata credit, for example) typically requires a Form 8833 disclosure.

Form 706 and Form 706-NA are due nine months after death, with a six-month extension available by filing Form 4768. Failing to file when required triggers penalties and keeps the statute of limitations open indefinitely. If the deceased held Canadian registered accounts, the RRSP/RRIF cross-border guide covers the US treatment.

What planning actually reduces the double tax?

There’s no single move that eliminates the basis mismatch entirely, but a combination of strategies can reduce its cost substantially. The right approach depends on which country the deceased lived in, where the heirs live, the types of assets involved, and whether the family has time to plan before death.

Use the spousal rollover deliberately. If the surviving spouse is Canadian and the ultimate beneficiaries are in the US, the rollover under ITA 70(6) defers the deemed disposition and creates a planning window. During that window, the surviving spouse can implement an estate freeze, crystallize the LCGE on qualifying shares, or restructure holdings to reduce the eventual tax hit.

Claim the LCGE at death. If the deceased held QSBC shares, the executor should claim the LCGE on the terminal return. This directly reduces the Canadian tax, and because there’s less Canadian tax paid, it reduces the uncredited mismatch. The LCGE is use-it-or-lose-it at death: if it’s not claimed on the terminal return, the opportunity is gone for those shares.

Consider the departure tax angle. If someone is planning to leave Canada for the US during their lifetime, the departure tax and treaty basis step-up election can address part of the problem in advance. The departure tax triggers a deemed disposition at emigration, and a treaty election under Article XIII(7) can step up the US cost basis at that point. This aligns the two countries’ bases going forward, so the mismatch doesn’t pile up until death.

Fund the Canadian tax with life insurance. A policy sized to cover the projected deemed disposition tax means the estate doesn’t have to choose between paying CRA and preserving assets for the heirs. This is especially useful for illiquid holdings like private company shares or real estate, where selling to cover the tax bill would destroy value.

Coordinate the executor’s filings carefully. The executor needs to file in both countries and claim every available credit and deduction. On the Canadian terminal return, claim the foreign tax credit under ITA 126 for any US tax actually paid. On the US estate tax return, claim the treaty-based unified credit under Article XXIX-B. The credits won’t fully solve the basis mismatch, but failing to claim them makes the problem worse, sometimes by hundreds of thousands of dollars.

Don’t ignore the RRSP/RRIF layer. Registered accounts add a separate dimension. On death, the full RRSP/RRIF value is included in the deceased’s income in Canada (unless a spousal rollover applies), and the US has its own rules for the inherited account. Mishandling the designation or failing to coordinate the cross-border treatment can trigger unnecessary tax on top of the deemed disposition. The RRSP/RRIF cross-border death guide covers the coordination mechanics.

File early in both countries. The executor who files promptly, claims all available credits, and coordinates payment timing avoids compounding penalties and interest. For estates where both CRA and IRS debt exists, the executor obligations guide walks through the priority and payment sequence.

• Inheritance tax in Canada: what heirs actually pay, the full explanation of how Canada taxes estates through the deemed disposition
• Cross-border estate planning: freezes, alter ego, and bypass, advanced trust and freeze strategies for cross-border families
• US estate tax for Canadians and the $60,000 exemption, the treaty relief mechanism for Canadians with US-situs assets
• The US-Canada tax treaty explained, a full walk-through of the treaty’s provisions across income types
• Post-mortem pipeline and the 164(6) election, how to eliminate double taxation on CCPC shares at death
• What the estate owes: CRA and IRS debts after death, executor obligations when tax debt exists in either or both countries
• RRSP and RRIF on death with a cross-border connection, registered account treatment for US-connected beneficiaries
• Joint tenancy (JTWROS) and cross-border tax, how joint ownership interacts with the deemed disposition and US estate tax
• Canadian departure tax and the US basis step-up, the treaty election that aligns cost bases when someone emigrates
• Life insurance in a cross-border context, structuring a policy that works on both sides of the border
• Spousal trusts in Canada for mixed-status couples, how the ITA 70(6) rollover into a spousal trust defers the deemed disposition until the surviving spouse’s death

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.