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Contesting a Will Based on Lack of Testamentary Capacity in Ontario

12 Jun 2026 5 min read No comments Wills & Estate Planning Ontario
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In Ontario, contesting a Will based on a lack of testamentary capacity requires proving the testator did not understand the nature of their Will. This is evaluated using the legal framework known as the Banks v Goodfellow test. Filing a formal challenge at the Superior Court of Justice involves court fees starting around $339 CAD, and requires compelling medical evidence.

As Ontario’s population ages in major centres like Toronto, Ottawa, and Mississauga, issues surrounding estate planning are becoming increasingly complex. Unfortunately, diseases such as Alzheimer’s and other forms of dementia are on the rise. This reality often leads to difficult family situations where a vulnerable parent may have signed a Will while they were mentally unfit to understand what they were signing.

Discovering that a loved one altered their estate plan during a period of cognitive decline is deeply emotional. 🖥 You might feel that a caregiver or sibling took advantage of them. In Ontario, the law provides a mechanism to challenge a Will if the deceased lacked “testamentary capacity.” However, proving this in court is a rigorous process that relies heavily on medical records and expert opinions rather than just family anecdotes. Generally, consulting with an experienced Ontario estate lawyer is the best first step to assess the strength of your claim.

Step-by-Step Process for Contesting Capacity in Ontario

Challenging a Will is a formal legal procedure that takes place in the Superior Court of Justice. The process is strict, and a judge will start with the assumption that the testator had capacity unless proven otherwise. Here are the general steps to bring a capacity claim forward.

Step 1: Understand the Banks v Goodfellow Test

Ontario courts do not just ask if the person had dementia; they apply a historic legal standard known as the Banks v Goodfellow test. 📖 Under this test, the testator must have understood the nature of making a Will, known the extent of their property, recognized the people who would usually be expected to inherit, and been free from any mental delusions that poisoned their affections. Failing even one of these criteria can invalidate the document.

Step 2: File a Notice of Objection

If the suspicious Will has not yet been approved by the court (probated), your lawyer can file a Notice of Objection at the local Superior Court of Justice courthouse. This essentially freezes the estate process. The Estate Trustee will not be granted the Certificate of Appointment of Estate Trustee until the dispute is resolved, preventing them from distributing the assets.

Step 3: Gather Medical and Financial Evidence

Because the court relies heavily on facts, gathering medical records is crucial. 👨‍⚕️ You will need to obtain clinical notes from the deceased’s family doctor, hospital records, and any cognitive assessments (like MoCA or MMSE scores) performed near the time the Will was signed. Financial records can also show erratic spending behaviour that highlights a decline in mental functioning.

Step 4: Obtain a Retrospective Capacity Assessment

Often, a judge requires a professional medical opinion. Your law firm may hire a geriatric psychiatrist to perform a “retrospective capacity assessment.” The expert will review all the medical records, witness statements, and the lawyer’s drafting notes to provide an official opinion on whether the deceased had the mental capacity to sign the Will on that specific date.

Step 5: Attend Mediation and Trial

In Ontario, mandatory mediation applies to estate litigation in Toronto, Ottawa, and Essex County, though it is highly recommended across the province. 💬 During mediation, both sides attempt to reach a settlement without going to trial. If mediation fails, the case proceeds to a formal trial where a judge will make the final ruling on the Will’s validity.

How Much Does it Cost in Ontario?

Estate litigation can be a significant financial investment. 💰 While costs vary depending on the complexity of the medical evidence, here are common expenses:

  • Court Filing Fees: Starting an application at the Superior Court of Justice typically involves a filing fee of approximately $339 CAD.
  • Lawyer Fees: Most estate litigation lawyers charge hourly rates ranging from $350 to $700+ CAD. A full trial can easily result in legal fees between $50,000 and $150,000 CAD.
  • Expert Medical Witnesses: Hiring a psychiatrist to write a retrospective capacity report often costs between $3,000 and $10,000 CAD.
  • Mediation Costs: A private estate mediator usually charges $2,000 to $5,000 CAD for a full-day session, typically split between the parties.

How Long Does the Process Take?

Contesting a Will is rarely a quick process. ⏱ Gathering historical medical records alone can take 3 to 6 months. If the matter is resolved during mandatory mediation, the timeline might be 9 to 18 months. However, if the dispute requires a full trial at the Superior Court of Justice, it is common for the entire process to take 2 to 4 years, depending on court availability in your specific region.

The Banks v Goodfellow Test Explained

This legal test is the cornerstone of any capacity challenge in Ontario. To create a valid Will, the deceased must have been able to demonstrate all of the following:

Legal CriterionWhat it Means in Plain English
Nature of the ActThe person understood they were signing a Will that dictates who gets their assets after death.
Extent of PropertyThe person generally knew what they owned (e.g., a house in Hamilton, a bank account, an RRSP).
Moral ClaimsThe person could comprehend who their immediate family or dependents were (who normally expects to inherit).
Free from DelusionsThe person did not have a mental illness or paranoia that caused them to unfairly cut out a loved one.

Frequently Asked Questions (FAQ)

Does a dementia diagnosis automatically invalidate a Will?

No. In Ontario, a person with early-stage dementia or Alzheimer’s can still possess testamentary capacity if they meet the Banks v Goodfellow test on the specific day they sign the document. Capacity is fluid and can change from day to day.

Who has the legal standing to challenge a Will?

Generally, anyone who has a financial interest in the estate can file a challenge. This usually includes beneficiaries named in a previous Will, or immediate family members who would inherit under Ontario’s intestacy laws if the Will is thrown out.

Will the estate pay for my legal fees?

Historically, courts ordered the estate to pay the legal fees for all parties. However, modern Ontario judges often apply a “loser pays” principle. If your challenge is unsuccessful and deemed frivolous, you may be personally ordered to pay the other side’s legal costs.

What happens if the court rules the Will is invalid?

If a judge declares the Will invalid due to lack of capacity, the court will look to the deceased’s most recent prior valid Will. If there is no previous Will, the estate will be distributed according to the rules of intestacy under the Succession Law Reform Act.

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