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№ 22 Wills & Estates

Proving a Will Was Not Properly Signed or Witnessed in Ontario

Think a will was not signed or witnessed properly? Learn how Ontario courts look at proof of execution, who carries the burden, and what to do next.

Wills & Estates5 min readTSLBy the Treadstone Law Team · OntarioUpdated October 28, 2026
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Key takeaways
  • In a contested case, the court looks for two witnesses present at the same time who saw the person sign the will.
  • The person relying on a will must prove due execution, knowledge and approval of its contents, and capacity.
  • A claim that seeks only a declaration about a will's validity has no limitation period, but adding other relief changes the analysis.

You may have been given a will that looks odd. Perhaps the witnesses were not in the room, one of them is a beneficiary, or the person who signed was unwell. If you think the will was not properly signed or witnessed, the question is what can actually be proved in court.

This article explains how Ontario courts approach proof of signing and witnessing in a dispute, who carries the burden, and what evidence tends to matter. It is general information, not advice on your situation. The exact statutory wording and any court power to excuse a defect should be confirmed with a lawyer.

What the court looks for when execution is challenged

When the signing of a will is contested, the court looks for proof that two witnesses were present at the same time and saw the person who made the will sign it. The idea is simple: the formalities exist so that there is reliable evidence the document is what it claims to be.

In one Court of Appeal case, the judge found insufficient evidence that the formalities were followed where only one interested person gave uncorroborated evidence that the will had been signed. The judge also noted a probable lack of capacity and suspicious circumstances.

Whether a particular defect can be fixed or excused by the court depends on the statute and the facts. That is a point to raise early with a lawyer, because it can change the whole strategy.

Who has to prove what

The party putting the will forward carries the legal burden of proving due execution, knowledge and approval of its contents, and testamentary capacity. You do not have to prove the will is invalid just because you question it.

A challenger can meet an initial evidential burden by pointing to suspicious circumstances that, if accepted, would tend to show the person did not know and approve the contents or lacked capacity. The legal burden then reverts to the party relying on the will.

Issue raisedWho carries the burden
Due execution, knowledge and approval, capacityThe party putting the will forward
Capacity, where suspicious circumstances raise doubtThe party putting the will forward, on a balance of probabilities
Undue influence over a willThe party attacking the will

Capacity often travels with signing problems

Signing disputes frequently overlap with capacity. Under the test applied in Ontario, the person must understand the nature and effect of a will, the property being disposed of, and the claims to be given effect to, with no disorder of the mind poisoning affections and no insane delusion influencing the gift.

If you raise both issues, be clear which facts support each one. Medical records, notes from people who saw the person around the date of signing, and the circumstances in which the document was prepared can all matter, though what is available varies from case to case.

Time limits, objections and process

There is no limitation period for a proceeding seeking only a declaration, such as that a will is valid or invalid, if no consequential relief is sought. Once you ask for other relief, limitation questions arise, and the basic period is two years from the day the claim was discovered. Because the line between the two can be fine, get advice before assuming you have unlimited time.

When a beneficiary files a Notice of Objection (Form 75.1), court staff notify the applicant, who must send the objector a notice to objector (Form 75.3) and file it with an affidavit of service. In one case, an objection meant the registrar could not issue probate and an order from a judge was required. The time limits and exact steps for filing an objection are worth confirming with a lawyer.

Costs and risk

Estate litigation follows the ordinary civil costs regime. Costs come out of the estate only where public policy considerations apply, such as giving effect to valid wills of competent testators, ensuring estates are properly administered, or litigation caused by the testator. A losing challenger should not assume the estate will pay.

What to do next

Frequently asked questions

Do both witnesses really need to be present together?

In a contested case, the court looks for two witnesses present at the same time who saw the person sign. If that cannot be shown, the will may be at risk. A lawyer can tell you how this applies to the specific document.

Who has to prove the will was signed properly?

The party putting the will forward carries the legal burden of proving due execution, knowledge and approval of contents, and capacity. A challenger usually starts by showing suspicious circumstances, after which the burden reverts to the propounder.

Is there a deadline to challenge the validity of a will?

A proceeding seeking only a declaration that a will is valid or invalid has no limitation period if no consequential relief is sought. If other relief is claimed, the basic two-year period from discovery may matter. Get advice early rather than relying on this distinction.

Does the estate pay for my challenge if I am right?

Not automatically. Costs come out of the estate only in limited public policy situations. Courts can also split costs between the losing party and the estate.

Sources

Links go to official government, court and regulator pages. The law changes — confirm you are reading the current version.

This article is general information, not legal advice. Reading it does not create a lawyer-client relationship. Ontario laws, tax rates, and government programs change, and how the law applies depends on your specific facts. For advice about your situation, speak with a licensed Ontario lawyer. Treadstone Law is licensed by the Law Society of Ontario — reach us at 1-844-900-1070 or start a file online.

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