When a shareholder of a private Canadian corporation dies, the Income Tax Act can tax the same economic value twice. The first layer of tax arises immediately on death; the second arises when the heirs try to take the corporation's value out as cash. Without planning, an estate can face a combined effective tax burden well in excess of 50% on the same accrued value. Post-mortem planning exists to collapse that duplication back down to a single layer of tax. The two principal tools are the pipeline and the subsection 164(6) loss carryback. This guide explains the double-tax problem, how each solution works, when each is appropriate, and the timing and anti-avoidance pitfalls that govern both.

The double-tax problem on death

The duplication comes from two separate provisions interacting.

The deemed disposition under s.70(5). Immediately before death, the deceased is deemed to have disposed of capital property — including private-company shares — at fair market value. Any accrued gain on those shares is realized on the deceased's final (terminal) return. This produces a capital gain, taxed at the individual's marginal rate on the included portion.
Tax on extracting the corporate value. After death, the estate or heirs own shares whose adjusted cost base has been stepped up to fair market value (because of the deemed disposition). But the cash, investments, or retained earnings still sit inside the corporation. To get that value into the beneficiaries' hands, the company must normally pay a dividend or redeem the shares — and that distribution is taxed again, as a dividend, in the hands of whoever receives it.

So the same accrued value is taxed once as a capital gain on death and a second time as a dividend on distribution. The deemed-disposition rules and the share-redemption rules under s.84 were not designed to coordinate, and left alone they stack. Post-mortem planning chooses which of those two taxes to keep and eliminates the other.

A worked example of the problem

Assume Maria owns all the shares of Opco, a Canadian-controlled private corporation. Her adjusted cost base is nominal ($100), and on death the shares are worth $2,000,000. Opco holds $2,000,000 of investment assets accumulated from after-tax business profits. The capital gains inclusion rate in force is 50% (the 2024 proposal to raise it to 66.7% was deferred and then cancelled in 2025, so 50% remains the law).

Layer 1 — deemed disposition (s.70(5)). Gain of roughly $2,000,000; taxable capital gain of $1,000,000. At a combined marginal rate of, say, 53%, the terminal-return tax is about $530,000.
Layer 2 — distributing the cash. If the estate simply has Opco pay out its $2,000,000, the bulk is a taxable dividend. At an eligible/non-eligible blended dividend rate of roughly 45%, that is on the order of $900,000 of additional tax.

Combined, that approaches $1.43M of tax on $2,000,000 of value — an effective rate well above 70%. Effective post-mortem planning aims to bring the total back toward a single layer (closer to the $530,000 capital-gains figure, or the dividend figure, but not both).

Solution 1: The pipeline (preserving capital treatment)

The pipeline keeps the capital gain already triggered on death and avoids the second, dividend-level tax. The logic: the estate has already paid capital gains tax on the share value and now holds shares with a high (stepped-up) cost base. A pipeline lets the estate extract the corporate value as a return of that cost base rather than as a dividend.

In broad terms the steps are:

The estate incorporates a new holding company ("Newco").
The estate transfers its Opco shares to Newco. Because the estate's cost base in the Opco shares was stepped up to fair market value on death, it can take back from Newco a promissory note (and/or shares) with a value reflecting that stepped-up base — without triggering a further gain.
Opco's value is then moved up to Newco over time, and Newco repays the note to the estate. The estate receives cash as repayment of a debt, not as a dividend.

The result is that the value comes out with effectively capital treatment — a single layer of tax (the capital gain already paid on the terminal return) rather than a stacked dividend.

CRA timing expectations for a pipeline

The pipeline only works if the CRA does not recharacterize the note repayment as a deemed dividend under subsection 84(2) (which applies where corporate funds are distributed on a winding-up, discontinuance, or reorganization of the business). Through its published rulings and roundtable positions, the CRA looks for substance and patience rather than an instant cash-out:

Continue the business for roughly one year. Favourable rulings have generally involved continuing the original corporation's business for at least one year after the pipeline is implemented, rather than an immediate liquidation.
Distribute gradually, not all at once. The promissory note should be repaid progressively after that initial period rather than immediately. Some rulings have referenced staged repayment (for example, a capped percentage per quarter after the first year).
Avoid a pure "cash corporation" wind-up. Pipelines on companies holding only cash with no continuing activity attract more scrutiny under s.84(2).

Importantly, the CRA has confirmed that the modernized general anti-avoidance rule (GAAR) does not, by itself, change its administrative position on properly structured pipelines that meet these existing guidelines. A pipeline that respects the timing and gradual-distribution expectations remains a recognized strategy.

Solution 2: The subsection 164(6) loss carryback

The second tool runs in the opposite direction: instead of preserving the capital gain, it eliminates the capital gain on the terminal return and accepts dividend treatment on the distribution.

The mechanics rely on the redemption rules:

The estate has the corporation redeem the deceased's shares.
On redemption, s.84(3) deems the estate to have received a dividend equal to the redemption proceeds over the paid-up capital. This dividend is taxed in the estate.
Because the dividend reduces the proceeds of disposition on the redemption, the estate realizes a capital loss on the shares (the high stepped-up cost base now exceeds the reduced proceeds).
Under subsection 164(6), a graduated rate estate can elect to carry that capital loss back to the deceased's terminal return, offsetting the capital gain that arose on death under s.70(5).

The net effect: the capital gain on death is cancelled by the carried-back loss, leaving the dividend as the single layer of tax. This is often attractive when the corporation holds assets (such as a refundable dividend tax pool, or eligible refundable balances) that make the dividend layer relatively efficient, or where the estate wants to access an enhanced dividend treatment.

The critical timing rule for s.164(6)

The election requires the estate to qualify as a graduated rate estate (GRE) and the loss to be realized within a limited window. For individuals who die on or after August 12, 2024, that window was extended from the estate's first taxation year to its first three taxation years (the longstanding one-year rule still governs earlier deaths). The election is made on the estate's T3 return, and the elected loss is then treated as the deceased's loss for the terminal year. The window is still a hard deadline — once it closes, the carryback is lost — so an executor should calendar it early and not assume the full three years will be available, because the GRE status itself can only last 36 months.

When does each fit?

Pipeline. Generally favoured when capital treatment is more efficient than dividend treatment, when the estate can afford to wait (the roughly one-year continuation and gradual distribution), and when the corporation has an operating business or assets that support a genuine continuation rather than a cash shell. It preserves the single capital-gains layer already paid.
s.164(6) carryback. Generally favoured when the dividend layer is comparatively efficient (for example, where refundable tax balances can be recovered), when liquidity is needed reasonably quickly, or when a pipeline is impractical. The redemption and resulting loss must fall inside the GRE's carryback window — the first three taxation years for deaths on or after August 12, 2024 (the first taxation year for earlier deaths).
Hybrid approaches. In some estates a combination is used — part of the value extracted via redemption and a s.164(6) carryback, and part via a pipeline — to optimize across capital and dividend rates. These require careful modelling.

The right answer depends on the corporation's tax accounts, the beneficiaries' situations, provincial rates, and how quickly cash is needed. There is no single default. For a broader view of how these choices interact with the estate plan, see our post-mortem tax planning service.

The s.84.1 and s.84(2) pitfalls

Two anti-avoidance provisions are the main hazards in this area.

Section 84.1 is an anti-surplus-stripping rule that can convert what looks like a capital transaction into a deemed dividend when a taxpayer transfers shares to a non-arm's-length corporation. In the pipeline context, s.84.1 is a concern because the estate transfers Opco shares to a related Newco. The strategy depends on the estate's cost base being a genuine, stepped-up base from the s.70(5) deemed disposition (not an amount sheltered by the capital gains exemption, which s.84.1 grinds). Structuring must respect the s.84.1 mechanics so the note is supported by real, taxed cost base.
Subsection 84(2) is the rule the pipeline must navigate, as described above. If the CRA views the arrangement as a disguised winding-up — corporate funds distributed too quickly, with no continuation of the business — it can recharacterize the note repayment as a deemed dividend, defeating the capital treatment and reintroducing double tax.

GAAR sits behind both. A pipeline structured purely to avoid the dividend with no business substance, or one that compresses the timeline aggressively, is more exposed. Conservative timing and genuine continuation are the practical defence.

A planning framework and timeline

A disciplined post-mortem process generally follows these steps:

Step 1 — Inventory and valuation (months 0–2). Determine the fair market value of the shares at death, the deceased's adjusted cost base, the corporation's paid-up capital, and its tax accounts (capital dividend account, refundable balances, safe income).
Step 2 — Model the alternatives (months 1–3). Compare the all-capital outcome (pipeline), the all-dividend outcome (s.164(6) carryback), and any hybrid, using current rates — the 50% inclusion rate and applicable provincial dividend rates.
Step 3 — Confirm the GRE deadline (month 0 onward). If a s.164(6) carryback is on the table, calendar the carryback window immediately — the first three taxation years of the GRE for deaths on or after August 12, 2024, or the first taxation year for earlier deaths; the redemption and loss must fall inside it.
Step 4 — Implement the chosen structure (months 2–6). For a pipeline, incorporate Newco, transfer the shares, and document the note. For a carryback, effect the redemption and prepare the election.
Step 5 — Observe CRA timing (year 1 and beyond). For a pipeline, continue the business roughly one year and then repay the note gradually; consider an advance income tax ruling for larger or less-typical fact patterns.
Step 6 — File and elect. Amend or file the terminal return to reflect the carryback, file the estate returns, and retain documentation supporting the substance of the structure.

A worked example of the pipeline outcome

Return to Maria's estate ($2,000,000 of value, nominal cost base, 50% inclusion rate). On the terminal return, the deemed disposition produces about $530,000 of capital gains tax — the single layer the estate wants to keep. The estate's cost base in the Opco shares is now $2,000,000.

Using a pipeline, the estate transfers the Opco shares to Newco for a $2,000,000 promissory note. Newco continues Opco's activity for about a year, then repays the note to the estate in staged instalments. The estate receives the $2,000,000 as repayment of the note — not as a dividend — so there is no second layer of dividend tax. Total tax stays near the $530,000 already paid, instead of the $1.43M that arose in the unplanned scenario. By contrast, a s.164(6) carryback would have cancelled the $530,000 capital gain but added a dividend-level tax on the distribution; whether that beats the pipeline depends on the corporation's refundable balances and the beneficiaries' dividend rates — which is exactly what Step 2 models.

How Barrett Tax Law approaches post-mortem pipeline planning

Our approach starts with the numbers, not the structure. We value the shares, map the corporation's tax accounts, and model the capital-treatment route against the dividend route under current rates before recommending a pipeline, a s.164(6) carryback, or a hybrid. Where a pipeline is chosen, we structure it to respect the CRA's timing expectations — continuation of the business and gradual distribution — and to keep clear of the s.84.1 and s.84(2) hazards, including advance income tax rulings where the facts warrant. Where a carryback is chosen, we move on the graduated-rate-estate deadline immediately so the carryback window — three taxation years for deaths on or after August 12, 2024, one year for earlier deaths — is not lost. This work often dovetails with planning the client did during life; if you are still in the planning stage, our pages on the estate freeze and the estate freeze explained describe how to cap a future deemed disposition before death. For owner-managers, it also connects to owner-manager compensation and holding-company structuring.

If you are an executor or beneficiary facing private-company shares in an estate, the carryback clock may already be running. We offer a free, confidential consultation to review the estate's options and timelines.

Frequently asked questions

What is the double-tax problem on death for private-company shares?

When a shareholder dies, subsection 70(5) of the Income Tax Act deems them to have sold their shares at fair market value immediately before death, triggering a capital gain on the terminal return. That is the first tax. The corporation's underlying value, however, is still trapped inside the company. To get it into the beneficiaries' hands, the company must pay a dividend or redeem shares, which is taxed again as a dividend. The same economic value is therefore taxed twice: once as a capital gain on death and once as a dividend on distribution. Combined, the effective rate can exceed 70%. Post-mortem planning, using either a pipeline or a subsection 164(6) loss carryback, collapses this back to a single layer of tax by eliminating one of the two charges.

How does a post-mortem pipeline work?

A pipeline preserves the capital gain already paid on death and avoids the second, dividend-level tax. Because the deemed disposition under s.70(5) steps up the estate's cost base in the shares to fair market value, the estate can incorporate a new holding company (Newco), transfer the company shares to Newco, and take back a promissory note reflecting that stepped-up base. Newco then moves the operating company's value up and repays the note to the estate over time. The estate receives the value as repayment of a debt rather than as a dividend, so it comes out with capital treatment. The strategy depends on respecting CRA expectations: continuing the business for roughly a year and repaying the note gradually, so subsection 84(2) does not recharacterize the payments as a deemed dividend.

What is the subsection 164(6) loss carryback and when is it used?

The subsection 164(6) carryback eliminates the capital gain on the terminal return and accepts dividend treatment instead. The corporation redeems the deceased's shares; under s.84(3) the estate is deemed to receive a dividend, and because that reduces the redemption proceeds, the estate also realizes a capital loss on its high stepped-up cost base. If the estate qualifies as a graduated rate estate and the loss arises within the carryback window — the estate's first three taxation years for deaths on or after August 12, 2024, or its first taxation year for earlier deaths — it can elect under s.164(6) to carry that loss back to the deceased's terminal return, cancelling the capital gain triggered on death. This leaves the dividend as the single layer of tax. It is often used when the corporation has refundable tax balances that make dividend treatment efficient, or when cash is needed reasonably quickly.

How long does a pipeline take, and why the one-year wait?

The CRA's published rulings and roundtable positions generally expect that the original corporation's business continues for at least roughly one year after the pipeline is implemented, followed by a gradual, staged repayment of the promissory note rather than an immediate cash-out. Some rulings have referenced a capped percentage of repayment per quarter after that initial period. The waiting period and gradual distribution exist to demonstrate that the arrangement is not a disguised winding-up that subsection 84(2) would treat as a deemed dividend. A pipeline on a company holding only cash, with no continuation of activity and an instant distribution, attracts much more scrutiny. For larger or less typical fact patterns, an advance income tax ruling can confirm the repayment schedule is acceptable before the plan is carried out.

What are the section 84.1 and 84(2) pitfalls in pipeline planning?

Section 84.1 is an anti-surplus-stripping rule that can convert a seemingly capital transaction into a deemed dividend when shares are transferred to a non-arm's-length corporation. In a pipeline, the estate transfers shares to a related Newco, so the note must be supported by a genuine cost base created by the s.70(5) deemed disposition and taxed on death, not by an amount sheltered with the capital gains exemption, which s.84.1 grinds. Subsection 84(2) is the rule the repayment must navigate: if the CRA sees a disguised winding-up, with funds distributed too quickly and no business continuation, it can recharacterize the note repayment as a deemed dividend. The general anti-avoidance rule sits behind both, so conservative timing and real business substance are the practical defence.

Is the capital gains inclusion rate still 50% in 2026?

Yes. The 2024 federal budget proposed raising the capital gains inclusion rate from 50% to 66.7% on gains above a threshold for individuals and on all corporate gains. That proposal was first deferred and then cancelled in 2025, so the inclusion rate in force in 2026 remains 50%. This matters for post-mortem planning because the deemed disposition under s.70(5) produces a capital gain taxed at that inclusion rate on the terminal return. The Lifetime Capital Gains Exemption was increased and, for 2026 dispositions of qualified small business corporation shares, sits at $1,275,000 as it begins indexing. Because rates and thresholds change, any post-mortem model should be run on the figures actually in force in the year of death and distribution, not on a prior or proposed rate.

Post-Mortem Pipeline Planning: Avoiding Double Tax on Death