There is a single subsection of the Income Tax Act that most incorporated business owners in British Columbia and Alberta have never heard of. It is deceptively brief. And it could be the most expensive provision their family ever encounters.
Subsection 70(5) of the Income Tax Act says that at the moment of death, a taxpayer is deemed to have disposed of each capital property for proceeds equal to its fair market value. Nothing is actually sold. No buyer shows up. No transaction occurs. But CRA treats it as if every capital asset the deceased owned — including shares of a private corporation — was sold at the exact moment before death.
The capital gains tax on that deemed sale is calculated on the deceased's final tax return. It is due within six months.
If you own shares in a private corporation worth $3 million, and your adjusted cost base is essentially nominal — say $1,000 from when you incorporated — the deemed disposition creates a capital gain of $2,999,000.
At the 50% capital gains inclusion rate (confirmed at 50% for all taxpayers after the proposed increase to two-thirds did not proceed and was not enacted into law), the taxable capital gain is $1,499,500.
At BC's top combined capital gains rate of 26.75%, the tax on the deemed disposition is approximately $802,233.
That is the first tax event.
After the deemed disposition, the estate holds shares with a new cost base equal to the fair market value at death — $3 million. But the paid-up capital of those shares remains at the original $1,000. The corporation still holds all its retained earnings.
When the estate redeems or winds up those shares to extract the value, the difference between the redemption proceeds and the paid-up capital is treated as a deemed dividend under subsection 84(2) or 84(3). That deemed dividend is $2,999,000.
This is not a capital gain. It is a dividend. Specifically, it is a non-eligible dividend, taxed at BC's top combined rate of 48.89%.
The tax on that deemed dividend is approximately $1,466,211.
Add both events together:
Event 1 — deemed disposition: $802,233
Event 2 — deemed dividend on extraction: $1,466,211
Total: $2,268,444
On a corporation worth $3,000,000, the estate pays $2,268,444 in tax. The family keeps $731,556.
The effective tax rate: 75.6%.
This is not a worst-case projection. It is the default outcome under the Income Tax Act for any incorporated business owner who dies without post-mortem planning in place.
People sometimes assume that because the estate acquires the shares at the new fair market value (the "stepped-up cost base"), the second layer of tax disappears. It does not.
The deemed dividend is calculated against the paid-up capital of the shares, not the adjusted cost base. Even though the estate's ACB is now $3 million, the PUC remains at $1,000. The $2,999,000 difference is still taxed as a dividend.
The stepped-up cost base would only help if the estate sold the shares to an arm's-length buyer for $3 million — in that case, there would be no capital gain (FMV equals ACB) and no deemed dividend (the corporation's shares are sold, not redeemed). But in practice, most private corporation shares are not sold to arm's-length buyers within months of the owner's death.
The 75.6% effective rate is the outcome without planning. With planning, the math changes dramatically.
Pipeline planning eliminates the second layer entirely. The estate creates a new corporation, sells the shares of the original corporation to it, and the new corporation winds down the original through inter-corporate dividends — which are tax-free under Section 112. Total tax: $802,233. Effective rate: 26.75%. Tax saved: $1,466,211. CRA confirmed at the 2024 STEP Roundtable that properly structured pipelines remain valid under the amended GAAR.
Subsection 164(6) loss carryback takes a different approach. The estate redeems the shares, triggering the deemed dividend and a corresponding capital loss. That loss is carried back to the terminal return, offsetting the original capital gain. This eliminates the first layer but converts the extraction to dividend treatment. Effective rate: approximately 48.89% in BC. The carryback window was extended to three taxation years for deaths occurring after August 12, 2024.
Estate freezes under Section 86 or 85(1) lock the current value of the corporation on preferred shares, making the Section 70(5) tax liability predictable and insurable. All future growth passes to the next generation through new common shares. Corporate-owned life insurance then funds the exact amount needed to pay the frozen tax bill at death.
LCGE multiplication through a family trust can shelter up to $1,250,000 of capital gains per beneficiary — saving approximately $334,000 per person at BC's top rates. Four adult beneficiaries can shelter up to $5,000,000, saving approximately $1,337,500.
Section 70(5) does not apply only to large corporations. It applies to every incorporated business owner in Canada — construction companies, trades, professional corporations, medical practices, real estate firms, holding companies. If your corporation has retained earnings, real estate, equipment, goodwill, or any other assets that have appreciated since incorporation, there is a deemed disposition tax bill waiting on your final return.
The question is not whether Section 70(5) applies to you. The question is: do you know your number?
The Legacy Scorecard estimates your Section 70(5) exposure in 90 seconds. Answer eight questions about your corporation and your properties, and we calculate your estimated tax liability using current BC and Alberta rates. No financial statements required. You get your risk score immediately.
If you prefer to speak directly, book a free 15-minute Estate Risk Review. No obligation. No sales pitch. Just your number and what it means.
This article is educational and does not constitute tax, legal, or financial advice. Calculations use confirmed 2025–2026 tax rates and are illustrative. Capital gains inclusion rate: 50%. BC top combined capital gains rate: 26.75%. BC non-eligible dividend rate: 48.89%. Consult qualified professionals for advice specific to your situation.
Sources: Income Tax Act, subsections 70(5), 84(2), 84(3), 112. Budget 2025 legislation confirming 50% inclusion rate. CRA 2024 STEP Roundtable confirming pipeline validity. Department of Finance August 12, 2024 announcement on subsection 164(6) extension.