Ontario Professional Corporation on Death: How Doctors and Dentists Pay Tax on $1M+ in Corporate Retained Earnings in 2026

The Deemed Disposition: What Happens to Professional Corporation Shares at Death

Under subsection 70(5) of the Income Tax Act, a taxpayer who dies is deemed to have disposed of all capital property — including shares of a professional corporation — at fair market value immediately before death. The capital gain (FMV minus adjusted cost base) is reported on the deceased's terminal T1 return, not in the estate.

For a doctor or dentist who incorporated decades ago at a nominal cost of $100, the adjusted cost base of the shares is effectively zero. If the corporation is valued at $1.5M at death, the entire $1.5M is a capital gain — and under the 2024 capital gains inclusion rules, two-thirds of the gain above $250,000 is taxable income. That creates approximately $1M in taxable income on the terminal return, pushing the deceased into Ontario's highest combined marginal rate of 53.53%.

Why Most Professional Corporation Shares Fail the QSBC Test

The lifetime capital gains exemption (LCGE) — worth up to $1.25 million in 2026 — could shelter a significant portion of the deemed disposition. But it only applies to shares that meet the qualified small business corporation (QSBC) test under section 110.6 of the Income Tax Act. Three conditions must be satisfied simultaneously:

1. Small business corporation test (at disposition): At least 90% of the corporation's assets, by fair market value, must be used principally in an active business carried on primarily in Canada.
2. 24-month holding period test: The shares must have been owned by the individual for the entire 24 months before disposition.
3. 24-month asset test: Throughout those 24 months, more than 50% of the corporation's assets must have been used in an active business.

The holding period test is almost always met — the professional has owned the shares since incorporation. The problem is the asset composition tests. Professional corporations accumulate passive investments over years of retained earnings. A family physician earning $400,000 annually through the corporation, paying themselves a $200,000 salary, and retaining $100,000+ per year inside the corporation for 15 years easily accumulates $1.5M or more in passive investments — GICs, mutual funds, publicly traded stocks, or real estate holdings.

With only 19% of assets in active business use, this corporation fails the 90% test by a wide margin. The shares do not qualify as QSBC shares, and the $1.25M lifetime capital gains exemption is completely unavailable. Every dollar of the deemed disposition is taxable at full rates. For a deeper look at how the LCGE applies to business sales, see our lifetime capital gains exemption guide.

The Spousal Rollover Problem: Why Subsection 70(6) Does Not Save You

Under normal circumstances, property left to a surviving spouse or common-law partner rolls over at the deceased's adjusted cost base under subsection 70(6) — deferring the capital gain until the surviving spouse dies or sells. This is one of the most powerful tax deferral tools in estate planning. For details on how this rollover works for other assets, see our spousal rollover rules guide.

But professional corporation shares face a regulatory wall. Under the Ontario Business Corporations Act (section 3.2) and equivalent provincial legislation across Canada, only members of the regulated profession can hold voting shares in a professional corporation. A surviving spouse who is not a licensed doctor, dentist, or lawyer cannot legally hold the shares.

Alternative Minimum Tax: The Hidden Claw-Back on the Terminal Return

Even when a portion of the professional corporation shares does qualify for the lifetime capital gains exemption — for example, after a successful purification strategy — the alternative minimum tax (AMT) can claw back part of the benefit.

The 2024 AMT reforms significantly increased the AMT bite:

• AMT rate: Increased from 15% to 20.5%
• Capital gains inclusion: Increased from 80% to 100% for AMT purposes
• LCGE add-back: The full amount of the lifetime capital gains exemption claimed is added back as an AMT preference item

On a terminal return where $1.25M of LCGE is claimed, the AMT calculation includes the full $1.25M as a preference item. If the resulting AMT exceeds the regular tax (which is near zero because of the LCGE), the estate pays the AMT amount. The AMT credit can theoretically be carried forward seven years — but the deceased has no future years. The estate may carry the credit on T3 trust returns, but this requires active management and is not guaranteed.

Worked Example 1: $1M Professional Corporation — No QSBC Qualification

Dr. Patel, a family physician in Mississauga, dies at age 68 with the following professional corporation:

Dr. Patel's estate then winds up the corporation. The retained earnings distributed as a deemed dividend attract additional personal tax. After all corporate and personal tax is paid, Dr. Patel's family retains approximately $550,000 to $600,000 of the original $1M corporate value. For context on how deemed dispositions work at death across all asset types, see our detailed guide.

Worked Example 2: $2M Professional Corporation — Spousal Rollover vs. Immediate Disposition

Dr. Singh, a dentist in Brampton, dies at age 62 with a $2M professional corporation. Her spouse, Raj, is an engineer — not a licensed dental professional.

Scenario A: Spousal Rollover Attempted (But Fails)

Dr. Singh's will leaves the PC shares to Raj. However, the Royal College of Dental Surgeons of Ontario requires that only licensed dentists hold voting shares. Raj cannot hold the shares. The corporation must be wound up within 90 days.

• Deemed disposition at death: $2M capital gain, taxable capital gain of approximately $1,291,600
• Combined tax on terminal return: Approximately $640,000 to $680,000
• Corporate wind-up tax (deemed dividends): Additional $120,000 to $180,000 depending on GRIP and CDA balances
• Total tax: Approximately $760,000 to $860,000
• Net to family: Approximately $1,140,000 to $1,240,000

Scenario B: Estate Freeze Implemented 7 Years Before Death

If Dr. Singh had implemented an estate freeze when the corporation was worth $800,000, exchanging common shares for $800,000 in preferred shares and issuing new common shares to a family trust:

• Deemed disposition of preferred shares at death: $800,000 capital gain (frozen value)
• If QSBC-qualified (after purification): $800,000 fully sheltered by the $1.25M LCGE — $0 tax on the deemed disposition (subject to AMT, approximately $130,000)
• Growth since freeze ($1.2M): Accrues to the family trust, taxed when distributed to beneficiaries at their individual rates — potentially over multiple years and multiple beneficiaries
• Total tax (estimated): Approximately $300,000 to $400,000 (AMT on LCGE claim + trust distributions over time)
• Net to family: Approximately $1,600,000 to $1,700,000

Estate-Freeze Mechanics: What a CFP Should Implement 5–10 Years Before Retirement

The estate freeze is the single most effective planning tool for professional corporation owners. Here is the implementation sequence:

Step 1: Corporate Valuation

Obtain a formal business valuation from a Chartered Business Valuator (CBV). The valuation establishes the freeze amount — the value that will be attributed to the preferred shares. CRA will scrutinize valuations that appear artificially low, so a professional valuation is essential. For an overview of valuation methods, see our business valuation guide.

Step 2: Share Exchange (Section 85 Rollover)

The professional exchanges their common shares for fixed-value redeemable preferred shares using a section 85 rollover. The elected amount equals the adjusted cost base of the common shares (typically $100), so no immediate tax is triggered. The preferred shares are worth the current FMV of the corporation — say, $800,000 — and are redeemable at that fixed amount.

Step 3: New Common Shares to a Family Trust

New common shares are issued to a discretionary family trust for nominal consideration ($100). All future growth in the corporation's value accrues to these new common shares — and therefore to the trust beneficiaries (spouse, children, grandchildren). The professional retains the preferred shares, which are frozen at the exchange value.

Step 4: Corporate Purification

This is the step most professionals skip — and it is the reason the QSBC test fails at death. Purification means removing passive investment assets from the corporation so that 90%+ of remaining assets are active business assets. Common strategies include:

• Paying out dividends to reduce retained earnings invested in passive assets
• Transferring investments to a holding company using a section 85 rollover — the operating PC retains only active business assets, and the holding company holds the investment portfolio
• Using corporate-owned life insurance — the cash surrender value counts as a passive asset during life, but the death benefit flows to the capital dividend account (CDA) and can be extracted tax-free
• Paying down corporate debt or prepaying expenses to reduce the relative weight of passive assets

Step 5: Corporate-Owned Life Insurance

A permanent life insurance policy owned by the corporation serves two purposes: (1) the death benefit is received by the corporation tax-free and credited to the capital dividend account, allowing tax-free extraction by the estate, and (2) the death benefit provides liquidity to pay the tax liability on the deemed disposition without forcing a fire sale of practice assets. For a $1.5M professional corporation, a $500,000 to $750,000 life insurance policy can cover the estimated tax liability on the deemed disposition, ensuring the family retains the maximum after-tax value.

The Complete Professional Corporation Death Tax Timeline

Here is what happens — and when — after a licensed professional with a PC dies in Ontario:

1. Date of death: Deemed disposition of PC shares at FMV. Capital gain crystallizes on the terminal return. Regulatory clock starts on share redemption/wind-up (typically 90 days).
2. Within 90 days: Professional regulatory college requires shares to be transferred to an eligible holder or redeemed. Estate engages a locum or associate to wind down the practice if no buyer is identified.
3. Within 6 months: Estate trustee files for Ontario probate (Certificate of Appointment of Estate Trustee). PC shares are included in the Ontario probate estate at $15 per $1,000 above $50,000.
4. April 30 of the following year (or 6 months after death): Terminal T1 return filed. Capital gain from deemed disposition reported. LCGE claimed if QSBC test is met. AMT calculated.
5. Corporate wind-up: Corporation files final T2 return. Retained earnings distributed as deemed dividends. CDA balance used to extract tax-free amounts. Remaining amounts taxed as eligible or ineligible dividends on the estate's T3 return.
6. CRA clearance certificate: Estate requests clearance before final distributions to protect the executor from personal liability.

Five Actions Every Professional Corporation Owner Should Take Now

1. Run the QSBC asset test today. Ask your accountant to calculate what percentage of your corporation's assets are active business assets versus passive investments. If passive assets exceed 10% of total FMV, your shares do not currently qualify for the LCGE at death.
2. Get a corporate valuation. You cannot implement an estate freeze without knowing the current FMV. A CBV valuation costs $5,000 to $15,000 — a fraction of the $200,000+ in tax savings it enables.
3. Implement the estate freeze before age 60. The earlier you freeze, the more growth shifts to the family trust and the more time you have to satisfy the 24-month QSBC holding requirement.
4. Purify the corporation. Transfer passive investments to a separate holding company using a section 85 rollover. Keep only active business assets in the professional corporation. This is the step that makes the LCGE available.
5. Buy corporate-owned life insurance. The death benefit provides tax-free liquidity to cover the deemed disposition tax and ensures your family does not have to sell the practice at a discount to fund the CRA bill. For a complete estate planning checklist, see our Ontario guide.