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Notice of Objection in Ontario: How to Object to a Certificate

Find out who can file a notice of objection (Form 75.1) in Ontario, where it is filed, and what happens to the probate application afterward.

Wills & Estates4 min readTSLBy the Treadstone Law Team · OntarioUpdated November 13, 2026
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Key takeaways
  • A person who appears to have a financial interest in an estate may object before the certificate of appointment of estate trustee is issued.
  • The Notice of Objection is Form 75.1, filed with the registrar or the Estate Registrar for Ontario.
  • If the registrar tells the applicant about the objection, the applicant must send the objector a notice on Form 75.3 and file proof of service.

If you think someone is about to apply for probate and you disagree with the will or with who is applying, you may want a way to be heard before the court gives anyone authority over the estate. In Ontario, a notice of objection is that first step.

This article explains who can object, how the form works, and what the applicant must do once an objection is filed. What happens afterward depends on the facts, so a lawyer can help you plan the next steps.

What a notice of objection is

Probate is the court process that results in a certificate of appointment of estate trustee. A notice of objection is a short court form that tells the court someone disputes that application. Under Rule 75.03(1), the right to object arises before the certificate is issued.

It is not a full lawsuit.

Who can file one and how

Anyone who appears to have a financial interest in the estate may object. Whether your interest is enough in your situation is worth confirming with a lawyer.

Be specific about your reasons. Typical grounds include doubts about capacity, undue influence, or whether the will was properly signed, though the form itself asks you to describe your own objection.

What happens after you file

If the Registrar tells a probate applicant that a Notice of Objection (Form 75.1) has been filed, the applicant must send a notice to the objector on Form 75.3. The applicant must then file a copy of it with the court along with an affidavit of service.

From there, the matter may become a contested estate. In the Toronto Region, the Estates List of the Superior Court of Justice hears estate, trust and capacity matters, and Rule 75.06 gives the court considerable discretion and flexibility in setting a process. Before the court requires a will to be formally proved, the person challenging it must adduce, or point to, some evidence that, if accepted, would call the will's validity into question, which is a minimal threshold.

Related steps to consider

StepWhat it does
Form 74PAsks the court to notify you when someone starts a proceeding involving the estate
Notice of Objection (Form 75.1)Records your objection before the certificate is issued
Dependant support claimSome dependants may apply for support from the estate, with a time limit running from the grant

An objection does not replace other deadlines. For example, a dependant support application cannot be made more than six months after the grant of letters probate or of administration, although the court may allow a late application against any undistributed part of the estate.

What to do next

Frequently asked questions

When can I file a notice of objection?

Before the certificate of appointment of estate trustee is issued. If you are worried, acting early is sensible.

Where do I file it?

With the registrar or the Estate Registrar for Ontario, using Form 75.1.

Does the applicant find out?

If the Registrar tells the applicant about the objection, the applicant must send you a notice on Form 75.3 and file a copy with an affidavit of service.

Can I just be told when a proceeding starts?

A person with a financial interest can file Form 74P to ask the court to notify them when someone starts a proceeding involving 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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