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A family trust starts a 21-year clock the day you sign it.

It can multiply your family's tax exemptions and keep wealth out of probate — but there's a deadline built into every one of them that catches families off guard when nobody's watching for it.

A family trust doesn't reduce anyone's tax rate by itself. What it does is let a family redirect where income and gains land — spreading them across multiple people's tax brackets and exemptions instead of concentrating everything in one person's hands. Used well, that's a genuinely powerful tool. Used without watching the clock, it can also create a very large, very avoidable tax bill.

What it actually is

A family trust (technically an inter vivos discretionary trust — created during your lifetime, not through a will) is a legal arrangement where a trustee holds and manages assets for the benefit of named beneficiaries, with real discretion over who gets what and when. It's commonly used to hold shares of a private company or a growing investment portfolio, with a business owner's children (or a spouse) as beneficiaries.

Assets held in the trust generally bypass probate entirely, since they were never part of anyone's personal estate to begin with.

The real reason business owners use them: multiplying the LCGE

Each individual gets their own Lifetime Capital Gains Exemption — $1,275,000 in 2026. If a family trust holds qualifying small business shares and those shares are eventually sold at a gain, the trust can allocate that gain across multiple beneficiaries, each applying their own LCGE against their share.

The 21-year deemed disposition rule

This isn't a rare edge case — it applies to nearly every discretionary family trust, on a fixed clock that starts the day the trust is created. A trust settled in 2005 to hold growing business shares hits its 21st anniversary in 2026 — and if those shares have grown from a nominal value to $5 million, the trust owes real tax on that $5 million gain, with no sale to fund it from.

The standard defence: distribute appreciated property out of the trust to beneficiaries before the 21-year mark. Beneficiaries inherit the property at the trust's cost base — deferring the gain to whenever they eventually sell, rather than triggering it inside the trust with no cash to pay it. This has to be planned years ahead, not discovered in year 20.

The trap next to the trap: gifting instead of rolling out

Simply gifting trust assets to family members to sidestep the 21-year rule creates a different problem: attribution. Under section 75(2), income and gains on gifted property can be attributed straight back to whoever originally funded the trust — taxed in their hands, not the recipient's, defeating the entire point. The proper mechanism (a "rollout" under section 107(2)) is a specific, technical transaction, not a casual transfer — this is not a do-it-yourself step.

Coordinating with TOSI

Income the trust distributes to family members is still subject to Tax on Split Income rules unless a genuine exclusion applies — the trust itself doesn't grant immunity from TOSI. The two need to be planned together, not treated as separate problems.

Trusts with a narrower, specific job

• Alter ego trust — available at 65+; you're the sole beneficiary during your lifetime, assets transfer in tax-deferred, and at death they pass directly to named beneficiaries outside your estate and outside probate. Especially valuable in Ontario given its 1.5% probate rate.
• Joint partner trust — the couple's version of the above; both spouses are beneficiaries during their lifetimes, assets pass outside the estate at the second death.
• Henson trust — a discretionary trust for a beneficiary with a disability, structured so no beneficiary has an enforceable entitlement — preserving eligibility for provincial disability benefits like ODSP.