What Makes a Will Legally Valid in Ontario?
Last updated 2026-06 · Ontario
A will is one of the few documents where a small technical error can undo your entire intent. In Ontario, validity is governed by the Succession Law Reform Act (SLRA). Here is exactly what it takes.
The Ontario validity checklist
- In writing. Verbal wishes are not binding, no matter how clear.
- Signed by you at the end of the document.
- Two witnesses, present together. Both must watch you sign (or acknowledge your signature), then sign themselves while you watch.
- Capacity and age. You must be at least 18 and of sound mind — you understand what you own, who your dependants are, and what the will does.
The witness rule that voids gifts
Your two witnesses must be adults, and they must not be beneficiaries of the will or the spouse of a beneficiary. If your sister inherits and also witnesses your will, her gift can be struck out. Use neutral witnesses — a coworker, a neighbour, or a lawyer's staff — not the people you're leaving things to.
The handwritten exception
Ontario recognizes holograph wills: if the document is entirely in your own handwriting and signed by you, it is valid with no witnesses at all. The catch is that mixed documents (part typed, part handwritten) usually don't qualify, and holograph wills are easier to challenge.
Capacity matters more than people think
If you lose testamentary capacity through illness and don't regain it, you can no longer make or change a will. That's why estate lawyers meet with you alone — to confirm no one pressured you and that you understood the document.
Common mistakes that cause problems
- A beneficiary (or their spouse) acting as a witness.
- Signing in the margin or not at the end of the document.
- Witnesses not present at the same time.
- No named alternate executor or beneficiary.
- Leaving the original unsigned, or losing it — Ontario probate generally needs the original will, not a copy.
A note on recent changes
Since January 1, 2022, marriage no longer automatically revokes an existing Ontario will — an important shift for anyone who married after making a will. Ontario courts have also begun interpreting the SLRA's "substantial compliance" power, but for safety you should still execute on paper with two witnesses.
Frequently asked questions
Who can witness a will in Ontario? Any adult of sound mind who is not a beneficiary or the spouse of a beneficiary. Can a beneficiary witness a will in Ontario? They can, but doing so can void their gift — so never let a beneficiary witness. How many witnesses does a will need in Ontario? Two, present at the same time — unless it's a fully handwritten holograph will, which needs none. Does a will have to be notarized to be valid in Ontario? No. Notarization isn't a validity requirement, though it can simplify probate.
Not legal advice. General information about Ontario law as of 2026. Confirm specifics with an Ontario estate lawyer.
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