Who can witness a will — and who absolutely cannot

The witness rules exist to prevent two things: forged wills, and wills signed under pressure. They are simple, but the penalty for getting them wrong is severe and silent — the will stays valid while a gift quietly disappears.

The requirements

A witness must be:

• An adult: 18+ in Ontario and Alberta, 19+ in British Columbia
• Mentally capable of understanding what they are witnessing
• Physically present when you sign (with the narrow BC/Ontario electronic exceptions)
• Not a beneficiary of the will, and not the spouse of one

That last rule is the trap.

The void-gift trap

In all three provinces, a bequest to a person who witnessed the will — or, generally, to that witness’s spouse — is void. Note carefully what that means:

• The will remains valid. Probate proceeds normally.
• The gift disappears. It falls into the residue, or fails entirely.
• Nobody warns you. The problem surfaces after your death, when it cannot be fixed.

The classic case: a parent asks their two adult children — the main beneficiaries — to witness. The will is valid; the children’s inheritances are void. This is not rare. It is the most common execution error in homemade wills, and it is why our signing instructions repeat the rule three times.

BC gives a court a narrow discretion (WESA s 43) to save such a gift if satisfied there was no improper influence; do not plan around it.

Good witnesses and bad ones

Good: neighbours, coworkers, friends who inherit nothing, your lawyer or their staff. People who are younger than you and likely findable in twenty years — if probate ever needs an affidavit from a witness, your executor has to locate one.

Fine, with care: your executor — the role is a job, not a gift, so an executor who inherits nothing under the will can witness. But if your will leaves your executor anything, including a legacy “for their trouble”, they must not witness.

Never: anyone named in the will as a beneficiary; spouses of beneficiaries; anyone under the age requirement; anyone who cannot see or understand the signing.

Holograph wills need no witnesses

In Ontario and Alberta, a will written entirely in your own handwriting and signed needs no witnesses at all. The holograph rules and their risks. British Columbia does not recognise holograph wills.