An estate freeze is one of the most widely used pieces of Canadian private-corporation tax planning, and also one of the most misunderstood. At its core it is a simple idea: lock the value of a business owner's existing equity at today's fair market value, and let all future growth accrue to someone else — usually the next generation, a family trust, or both. Once the freeze is done, the owner's tax bill on death is fixed at today's number rather than tomorrow's larger one, and a series of other planning doors open: multiplying the Lifetime Capital Gains Exemption, splitting income within limits, and simplifying succession.

This guide walks through what an estate freeze actually is, why and when an owner would do one, the mechanics of the three rollover provisions used to implement it (sections 86, 85, and 51 of the Income Tax Act), the freeze-plus-family-trust combination that does most of the heavy lifting, the attribution rules that can quietly defeat the plan, and the "refreeze" that resets the structure when values move.

What an estate freeze actually does

When a Canadian dies owning private corporation shares, subsection 70(5) of the Income Tax Act deems them to have disposed of those shares at fair market value immediately before death. The accrued capital gain is reported on the deceased's final (terminal) return, and the estate pays the tax. If a business worth $2 million today is worth $8 million when the owner dies decades later, the deemed-disposition gain at death is built on the full $8 million — even though the owner never sold a thing.

A freeze interrupts that math. The owner exchanges their growth-bearing common shares for fixed-value preferred shares with a redemption amount equal to the corporation's current fair market value. New common (growth) shares are then issued to the next generation or to a family trust. From the freeze date forward:

The freezor's tax exposure is capped. The preferred shares do not grow. The deemed-disposition gain at death is fixed at the freeze-day value, so the future appreciation is no longer the owner's tax problem.
Future growth shifts. All appreciation after the freeze accrues to the new common shares — held by children, a holdco owned by children, or a discretionary family trust.
The LCGE can be multiplied. Where the growth shares are held by a family trust with several beneficiaries and the shares qualify as Qualified Small Business Corporation (QSBC) shares, each beneficiary may claim their own Lifetime Capital Gains Exemption on a future sale.
Income can be distributed. A family trust can allocate dividends among beneficiaries, subject to the Tax on Split Income (TOSI) rules that constrain — but do not eliminate — income splitting since 2018.
Succession is simpler. A clean freeze structure makes retirements, transitions, and inter-generational transfers far more orderly than ad hoc planning in the year of death.

A freeze does not eliminate the tax on death. It caps it. The portion of value frozen at today's number still produces a gain on the preferred shares; the planning value is that the future growth — often the largest part of the eventual estate — sits with the next generation instead.

When a freeze makes sense

There is no single right moment, but a freeze typically earns its keep when several of the following are true:

The corporation has appreciated meaningfully and is expected to keep growing.
The owner is comfortable accepting today's value as the cap on their death-tax exposure.
A transition to the next generation is contemplated, even if the timing is uncertain.
A future sale is on the horizon — five to ten years out — and the owner wants to multiply LCGE access across the family.
The owner is an incorporated professional (a pharmacist, dentist, physician, lawyer, or accountant) planning long-term succession within the constraints of their regulatory college.

Equally, a freeze is not always the answer. If the business may decline in value, freezing at today's number can leave the owner holding preferred shares worth more than the company. If the owner still needs all of the future growth to fund their own retirement, shifting it away is premature. The freeze is a tool, not a goal — the analysis starts with the family and business objectives, not with the mechanics.

The mechanics: sections 86, 85, and 51

Three rollover provisions of the Income Tax Act are used to carry out a freeze on a tax-deferred basis. The choice among them turns on the corporate structure, creditor-protection goals, regulatory constraints, and how much future flexibility the family wants.

Section 86 — the share-exchange freeze

Section 86 is the classic internal freeze. The existing common shareholder exchanges their common shares of the operating company for fixed-value preferred shares of the same company, as part of a reorganization of the corporation's capital. New common shares are then issued to the next generation or a family trust. For the exchange to roll over tax-deferred, certain conditions must be met: it must occur in the course of a reorganization of capital, no non-share consideration ("boot") can be taken back, and the fair market value of the preferred shares must equal the fair market value of the common shares surrendered. Section 86 suits a single-corporation business that does not need a separate holding company.

Section 85 — the holdco rollover freeze

Section 85 is the external freeze. The owner transfers their common shares of the operating company to a newly incorporated holding company, electing under section 85 to defer the gain, and takes back fixed-value preferred shares of the holdco. New common shares of the holdco are then issued to the next generation or a family trust. The freeze happens at the holdco level; the operating company itself is untouched. A section 85 freeze is preferable where creditor protection, asset separation, or future sister-corporation planning favours a two-corporation structure, or where the operating company should not have a family trust directly on its share register. The election is made on Form T2057. Our Section 85 rollover page covers the mechanics in more detail.

Section 51 — the conversion freeze

Section 51 permits a tax-deferred conversion of one class of shares into another class of the same corporation under a conversion right already attaching to the shares or the corporation's articles. It is narrower than section 86 and is used where the existing share terms or articles allow a straightforward conversion of common shares into fixed-value preferred shares without a full reorganization of capital. In practice many freezes default to section 86, with section 51 reserved for situations where the conversion right is already in place.

The freeze-plus-family-trust combination

The most flexible freeze issues the growth shares not to the children directly, but to a discretionary family trust. The reason is flexibility. At the time of the freeze, the owner rarely knows which child will run the business, which will sell, or what each family member's tax position will be in fifteen years. A discretionary trust lets the trustees decide later — based on circumstances as they actually unfold — who receives dividends, who receives capital gains, and who eventually receives the underlying shares.

A trust also supports LCGE multiplication. If the trust holds QSBC-qualifying growth shares and later realizes a capital gain on a sale, it can allocate that gain among multiple beneficiaries under subsection 104(21), and each beneficiary can claim their own exemption against their share. For a business that eventually sells for several million dollars, the multiplied exemption across a family of beneficiaries can shelter most or all of the gain. The mechanics and the QSBC qualification tests are covered in our LCGE and QSBC purification guide.

Designing the trust well is most of the work. The trustee choice affects control of the corporation. The beneficiary list must be complete and accurate, because adding or removing the wrong people later has technical consequences. The trust deed must permit capital-gains allocation if multiplication is in play, must coordinate with the corporation's share structure and any shareholders' agreement, and must plan for the 21-year deemed-disposition event discussed below. Our family trusts guide goes deeper on trust design.

Attribution: the rules that can defeat the plan

Several anti-avoidance rules can quietly undo the income-splitting benefits of a freeze if the structure is not built carefully.

Corporate attribution under section 74.4. Where a freeze transfers property to a corporation and one of the main purposes is to benefit a designated person (typically a spouse or minor child) while the freezor does not deal at arm's length with the corporation, section 74.4 can attribute a deemed interest benefit back to the freezor. Structuring the share terms and the trust to fall within the exceptions is essential.
Subsection 75(2) attribution. Where the freezor (or a person who contributed property to the trust) is also a trustee with certain powers, trust income and capital gains can be attributed back to that person. A common solution is to appoint an independent co-trustee and to use an unrelated settlor who provides only a nominal initial settlement.
TOSI. The 2018 Tax on Split Income rules tax certain dividends and gains received by family members at the highest marginal rate unless an exception applies — most commonly the "excluded business" exception (active engagement of 20-plus hours a week), "excluded shares," the rules for spouses aged 65 and over, or a reasonable-return analysis. Critically, LCGE-protected capital gains are not subject to TOSI, so the exemption-multiplication benefit of a freeze survives even where ongoing dividend splitting is constrained. See our TOSI page for detail.

The refreeze

A freeze locks in a value, but values move. If the corporation falls in value after the freeze — a recession, a lost major customer, an industry shift — the original frozen preferred shares can end up worth more than the whole company. A refreeze resets the structure: the existing preferred shares are exchanged for new preferred shares reflecting the lower current value, and new growth shares are issued at the lower base. A refreeze can also run the other way — resetting an old, low freeze value upward to reduce the growth-share exposure to TOSI or to bring a long-stale structure current. A refreeze is itself a section 86 or section 85 transaction, with the same documentation discipline as the original.

Common implementation problems

Most freeze problems are documentation problems, and they tend to surface years later on a sale or an audit:

Wrong share-class characteristics. Preferred shares without a fixed redemption value, a retraction right, and proper ranking do not actually freeze value.
Articles that do not authorize the new shares. A new growth-share class cannot be issued until the corporation's articles authorize it; articles of amendment must be filed before the freeze.
Valuation gaps. The fair market value of the freeze shares must match the value of what was surrendered. For a material freeze, an independent valuation is inexpensive insurance against a later challenge.
A trust deed that does not match the corporate structure. The beneficiaries, trustees, distribution rules, and 21-year plan in the deed must line up with the share structure and the shareholders' agreement.
A minute book never updated. Freezes are frequently executed and then left undocumented in the corporate records, which becomes a real problem on a future sale or audit.

How the work is done

A typical estate-freeze engagement runs through confirming the family and business objectives, valuing the corporation where the gain is material, designing the share structure (with professional-regulatory rules in mind where they apply), drafting and filing articles of amendment, drafting the trust deed and shareholders' agreement, executing the freeze with the appropriate section 85, 86, or 51 documentation, coordinating the tax-pool tracking (paid-up capital, adjusted cost base, GRIP/LRIP, RDTOH, capital dividend account) with the accountant, and documenting the file so it supports itself on a future audit, sale, or estate. Most freezes are six to twelve weeks of work and are commonly quoted as a fixed fee.

A freeze interacts with later events too. On the owner's eventual death, the frozen preferred shares still produce a gain, and post-mortem techniques such as the subsection 164(6) loss carryback and pipeline planning manage the double-tax exposure on that gain — covered in our post-mortem tax planning guide. A freeze set up today is the first move in a plan that plays out over decades, which is exactly why getting the structure right at the outset matters so much.

The Estate Freeze, Explained