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How to Get a Marriage Annulment in Ontario Court

Learn how annulment differs from divorce in Ontario, which laws apply, what a court looks at, and the practical steps and costs to discuss with a lawyer.

Family Law6 min readTSLBy the Treadstone Law Team · OntarioUpdated October 28, 2026
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Key takeaways
  • Divorce and annulment rest on different laws: the Divorce Act deals with marriage breakdown, while annulment law comes from the Annulment of Marriages Act (Ontario), which applies English law as it stood on 15 July 1870.
  • Consent, minimum age and no earlier undissolved marriage are the legal building blocks courts start from.
  • Annulment claims go to the Superior Court of Justice, and arbitrators cannot annul a marriage.
  • The exact procedure, evidence and timeline depend on your facts, so confirm them with a family lawyer before you file.

You may be asking about annulment because your marriage feels like it should never have counted: perhaps one person was already married, someone was too young, or agreement to marry was not truly given. People often assume annulment is a quicker or simpler version of divorce. Whether that is true for you depends on your facts, so it is worth confirming with a lawyer.

This article explains where annulment law comes from, what the court is generally asked to decide, and how family filings and court fees generally work in the Superior Court. It also points out where the answer depends on your facts, so you know what to ask a lawyer.

Annulment and divorce are different things

A divorce ends a marriage that was valid. Under the Divorce Act, a court can grant a divorce when the marriage has broken down, which is shown by spouses living separate and apart for at least one year, or by adultery or physical or mental cruelty that makes living together intolerable. Those grounds are not the test for an annulment.

The Supreme Court of Canada has said that a validly solemnized marriage may, under English law, be void or voidable on grounds other than those that give a right to divorce. In plain words, a marriage can have a legal defect that has nothing to do with whether the relationship worked out.

QuestionDivorceAnnulment
Main lawDivorce ActAnnulment of Marriages Act (Ontario), plus the Civil Marriage Act
What it rests onMarriage breakdown, for example one year living separate and apartA defect in the marriage itself, such as lack of consent, age or a prior marriage
CourtSuperior Court of JusticeSuperior Court of Justice

Where Ontario annulment law comes from

The federal Annulment of Marriages Act (Ontario) applies the English law of annulment as it stood on 15 July 1870, so far as it can be applied, and gives jurisdiction to what was then the Supreme Court of Ontario. That court is now the Superior Court of Justice, and the Courts of Justice Act also confirms its jurisdiction.

The Civil Marriage Act sets out basic requirements for a marriage. They are:

These rules are the basis for treating underage and bigamous marriages as invalid. Whether a particular problem makes a marriage void, voidable or still valid is a legal question that depends on the facts, and a lawyer can assess it.

What a court is generally asked to decide

Whether any of the basic requirements for consent, age or an earlier marriage was missing in your case depends on your facts, so it is worth confirming with a lawyer.

A few related points are worth knowing:

Court steps, forms and costs you can plan for

The detailed procedure for a declaration of nullity, including which forms are used and what evidence the court expects, depends on the circumstances and should be confirmed with a family lawyer. What can be said is how family filings generally work in the Superior Court.

The Ontario government lists the Superior Court fee for filing a family application at $214.00 and for placing an application on the list for hearing at $445.00. Which fees apply to a nullity claim depends on how it is brought, and fee amounts can change, so confirm them before filing.

If money is tight, you can ask to have court fees waived. Eligibility depends on household income or benefits, and on household liquid assets under $2,800 and net worth under $11,100. You apply on Form FW-A 3 if you think you meet the financial requirements or FW-A 4 if you do not, the form must be sworn or affirmed, and a waiver must be requested separately for each case. A waiver does not cover lawyers' fees or the cost of serving documents.

Evidence and timeline: what depends on your case

There is no confirmed fixed timeline for an annulment. How long it takes depends on whether the other person responds, whether the facts are disputed, and how busy the court is. In family cases generally, an answer is due 30 days after service, or 60 days if the respondent is outside Canada and the United States.

The evidence you need will follow the reason you are asking for annulment. Exactly what a court expects for an earlier marriage, age or consent depends on your facts, so confirm it with a lawyer.

What to do next

Before you decide between annulment and divorce, collect the paperwork and write down your timeline so a lawyer can tell you which route fits your facts.

Ask a family lawyer whether annulment is available on your facts, whether divorce is simpler, and what the likely steps and costs are.

Frequently asked questions

Is an annulment easier to get than a divorce in Ontario?

Not necessarily. A divorce can be based on living separate and apart for at least one year, while an annulment depends on a defect in the marriage itself, such as consent, age or a prior marriage. Which is simpler depends on your facts.

Which court handles an annulment?

The Annulment of Marriages Act (Ontario) gives jurisdiction to what was the Supreme Court of Ontario, which is now the Superior Court of Justice.

Can a religious body or arbitrator annul my marriage legally?

Arbitrators cannot grant a divorce or annul a marriage. Whether a decision from a religious body has any legal effect on your marriage depends on your situation, so it is worth confirming with a lawyer.

How long does an annulment take?

How long it takes depends on whether the other person responds and whether the facts are disputed. A lawyer can give you a realistic estimate once they know your situation.

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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