Contesting a Will in Ontario: Grounds and Process

Discovering that a loved one's will leaves you out — or leaves you far less than you expected — is distressing. It can feel even worse when you believe the will does not reflect what that person truly wanted, or that someone took advantage of them in their final years.

Contesting a will in Ontario is possible, but it is not simple. Courts take will-making seriously. The burden of proving that a will is invalid sits on the person challenging it, and the grounds are specific. This article explains who can contest a will, what legal grounds exist, how the process generally works, and what a claim for dependant's relief involves.

Who Can Contest a Will in Ontario?

To challenge the validity of a will, you generally need standing — a legal interest in the outcome. Those who typically have standing include:

• Beneficiaries named in the will being challenged
• Beneficiaries named in an earlier will (who would benefit if the later will is set aside)
• Heirs who would inherit under intestacy rules if there were no valid will at all (spouses, children, other relatives)
• Creditors of the estate, in limited circumstances

A person who simply expected to receive a gift but has no prior will or family law interest generally has a harder path to standing.

Grounds for Challenging a Will's Validity

1. Lack of Testamentary Capacity

To make a valid will in Ontario, the person making it (the testator) must have testamentary capacity at the time of signing. This means they must:

• Understand the nature and effect of making a will
• Know the nature and approximate extent of their property
• Understand who their natural heirs are (spouse, children, and so on)
• Not be suffering from a disorder of the mind that poisons their affections or perverts their sense of right

Having a diagnosis of dementia, Alzheimer's disease, or another cognitive condition does not automatically mean a person lacked capacity. Capacity is assessed at the specific moment the will was made, and a person can have good days and bad days. Medical records, the observations of witnesses who were present, and the notes of the lawyer who prepared the will all become important evidence.

2. Undue Influence

A will can be set aside if it was the product of undue influence — meaning someone overrode the testator's free will and substituted their own. This is not the same as persuasion or family pressure. Undue influence means coercion that overpowered the testator's own wishes.

Undue influence is notoriously difficult to prove because it typically happens behind closed doors. Courts look at circumstantial evidence: was the testator isolated from family? Did one person suddenly become the gatekeeper to the testator's life and finances? Did the will change dramatically in favour of that person near the end of life? These patterns raise suspicion but do not prove the claim on their own.

3. Fraud or Forgery

If the will itself is a forgery, or if the testator was deceived into signing it (for example, told it was a different document), the will is invalid. These claims are relatively rare but do arise.

4. Improper Execution

Ontario's Succession Law Reform Act requires that a will be:

• In writing
• Signed at the end by the testator (or by someone else in their presence and at their direction)
• Witnessed by two persons who are present at the same time and sign in the testator's presence

A will that does not comply with these formal requirements may be invalid. However, Ontario courts do have authority, in certain circumstances, to validate a document that did not strictly comply with the formalities if it is clear the testator intended it to be their will. This "dispensing power" has made strict execution challenges less certain than they once were.

5. Suspicious Circumstances

Where the circumstances surrounding the making of a will raise a suspicion that it does not represent the testator's true wishes, the court may require the propounder of the will (usually the estate trustee) to prove the will's validity more rigorously. Suspicious circumstances and undue influence often overlap.

Dependant's Relief Claims: A Different Kind of Challenge

Contesting a will's validity is not the only way to challenge an estate's outcome. Under Ontario's Succession Law Reform Act, certain dependants of the deceased can make a claim for support from the estate if the will (or the intestacy distribution) does not make adequate provision for them.

A "dependant" under the Act is defined broadly and includes the deceased's spouse, same-sex partner, parent, sibling, or child — including an adult child if they were financially dependent. The court has discretion to order the estate to pay a lump sum or ongoing support based on the claimant's need and what is adequate in all the circumstances.

This type of claim is separate from a validity challenge. A person can make a dependant's relief claim even if they accept the will as valid; they are not arguing the will is a forgery or that the testator lacked capacity — they are arguing that the distribution it creates is inadequate for their support.

The General Process

Challenging a will is typically commenced in the Ontario Superior Court of Justice. The general steps are:

1. Obtain legal advice early. A lawyer will assess the strength of the claim before any steps are taken.
2. Gather evidence. Medical records, financial records, communications, witness accounts, and the lawyer's file from the will-drafting appointment all become important.
3. Commence proceedings. In a validity challenge, this is typically done by filing a Notice of Objection with the court or commencing an application or action before the Certificate of Appointment is granted.
4. Discovery and examination. The parties exchange documents and are examined under oath.
5. Trial or settlement. Many estate disputes settle before trial. Those that do not are determined by a judge.

Time limits matter. There is no single fixed limitation period for all will challenges in Ontario — the applicable timeline depends on the type of claim and when the claimant knew or ought to have known of the grounds. Dependant's relief claims under the Succession Law Reform Act have a specific deadline tied to the date of the Certificate of Appointment or the date distribution begins; that deadline (verify the current period with a lawyer) is short enough that delay can be fatal to the claim. Get advice promptly.

Is Contesting a Will Worth It?

Challenging a will is expensive and emotionally draining. Costs can easily reach significant figures before a case is resolved, and legal costs are not always fully recovered even if you succeed. Courts can order costs against unsuccessful challengers.

The realistic questions to ask are:

• How strong is the evidence of incapacity, undue influence, or improper execution?
• What is the value of the estate and therefore the value at stake?
• What is the realistic chance of success?
• Are there alternative resolutions — a negotiated settlement, a mediated agreement between beneficiaries — that are faster and less costly?

A frank conversation with a lawyer at the outset helps answer these questions before significant resources are committed.

Frequently asked questions