What Happens If the Executor Named in an Ontario Will Is a Minor?

Wills are sometimes written years, or decades, before they are ever used — and family circumstances change in the meantime. A will drafted when a child was an adult might later be relied on when that "child" is, in fact, still under 18, or an older will might simply have named a young relative without fully thinking through the timing. Either way, the same question comes up: can someone under 18 actually act as executor in Ontario?

The answer is straightforward, even though the practical fallout often is not: a minor cannot legally act as an estate trustee in Ontario, full stop. What happens next depends on how the rest of the will is set up.

The Rule: An Estate Trustee Must Be an Adult

Acting as an estate trustee involves significant legal and financial responsibility — managing property, dealing with creditors, handling tax filings, and ultimately distributing assets to beneficiaries. Ontario law treats this as a role only an adult can hold. Someone who has not yet reached the age of majority cannot be appointed, and cannot validly act, as estate trustee, regardless of what the will says.

This is a different rule from the minimum age to make a valid will in Ontario, which is generally 18 as well (with narrow exceptions for specific situations such as certain married minors or members of the Canadian Forces). Both rules point the same way, but they answer different questions — one is about who can write a will, the other is about who can administer one.

What Happens If the Named Executor Is a Minor

Step 1: Check whether the will names an alternate executor

Many wills anticipate that a first-choice executor might not be able to act, and name a backup — commonly called an alternate or substitute executor. If the will includes an adult alternate, that person can generally step forward and apply for the Certificate of Appointment of Estate Trustee instead, without needing to involve the court in resolving the minor's ineligibility itself.

Step 2: If there's no eligible alternate, someone else may need to apply

Where no adult alternate is named, or the named alternate is also unable or unwilling to act, another interested person — often a parent, other family member, or beneficiary — may need to apply to the court to administer the estate under the will, since a valid will exists but no one named in it is currently able to act as executor. This is a more involved process than a straightforward Certificate of Appointment application and generally benefits from a lawyer's guidance.

Step 3: The estate is administered according to the will's terms either way

Whoever ultimately steps in as estate trustee is still bound to carry out the will's instructions — who is administering the estate does not change who inherits or in what shares. A minor's ineligibility to act is a procedural problem, not a change to the substance of the will.

Can the Minor Ever Take Over the Role Later?

In principle, once someone reaches the age of majority they are no longer barred from acting as an executor purely because of age. In practice, estates generally cannot sit unadministered for years waiting for a named minor to turn 18 — bills, taxes, and beneficiaries' needs don't pause — so another eligible person typically needs to step in well before that point. Whether a minor named executor could ever take over a role someone else has already been actively administering is a fact-specific question worth discussing with a lawyer rather than assuming either way.

How This Situation Is Best Avoided Going Forward

• Review and update wills periodically, especially when a named executor's circumstances (including age) may have changed since the will was signed
• Always name at least one adult alternate executor, even when the primary choice seems obvious
• Avoid naming a minor as sole executor with no backup, even if the intention is for them to "grow into" the role — the will can still leave them a full inheritance without naming them as the person responsible for administering the estate

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