Key Legal Steps For Getting A Marriage Annulment in Ontario

Mar 11, 2026

When you undergo a legal marriage annulment process, your marriage is declared invalid. Unlike a divorce, an annulment establishes that your marriage never legally existed.

If you are considering this option, it is important to understand the legal requirements and the steps involved. In Ontario, annulments are less common than divorce and are only granted in specific circumstances.

Kelly Jordan Family Law helps clients navigate complex separation, divorce and family law matters, including determining whether an annulment is appropriate and guiding them through the legal process in Ontario.

In this post, we share insights about under which circumstances you can have your marriage annulled and the key steps of a marriage annulment.

What Is A Marriage Annulment?

A marriage annulment is a court declaration that a marriage was never legally valid. When a court grants an annulment, it means the marriage should not have taken place under the law.

This differs from divorce in several ways:

Divorce ends a valid marriage
Annulment declares the marriage legally invalid from the beginning
Divorce is available to any married couple who meets the legal requirements
Annulments are only granted when specific legal conditions exist

In other words, an annulment is not simply an alternative to divorce. The court must be satisfied that the marriage was invalid due to legal or factual circumstances.

What Are The Legal Grounds For Marriage Annulment In Canada?

A marriage annulment in Canada is governed by both federal and provincial laws. The court must determine that the marriage was legally void or voidable.

Common legal grounds include:

Lack Of Legal Capacity

A marriage may be annulled if one or both parties lacked the legal capacity to marry. This can include situations where:

One spouse was already legally married to another person (bigamy)
One or both parties were under the legal age to marry
One spouse did not understand the nature of the marriage due to mental incapacity

Lack Of Genuine Consent

Consent is a fundamental requirement of a valid marriage. An annulment may be granted if consent was not freely given. Examples include:

Marriage obtained through fraud or deception
One spouse was forced or pressured into the marriage
One spouse was intoxicated or otherwise unable to give informed consent

Non-Consummation Of The Marriage

In some cases, courts may consider annulment where the marriage was never consummated. It can also do so when one spouse is permanently unable or unwilling to have marital relations.

Prohibited Family Relationships

Canadian law prohibits marriage between close relatives. If a marriage occurs between individuals who are legally barred from marrying each other, it may be annulled.

Each case depends on its specific facts, and courts will closely examine whether the legal grounds are met.

When Is The Best Time To Choose A Marriage Annulment?

In many cases, marriage annulments are sought shortly after the marriage, once the issue becomes clear.

An annulment may be appropriate when:

A legal defect existed from the beginning
One spouse discovers fraud or misrepresentation soon after the wedding
A party realizes that valid consent was never given

For example, if someone learns shortly after the wedding that their spouse was already married or concealed important facts that would have prevented the marriage, an annulment may be possible.

However, waiting a long time before seeking an annulment can cause complications. Courts may question why the marriage continued if the grounds for annulment were known earlier.

Speaking with a family lawyer as soon as possible can help determine whether an annulment is realistic or whether divorce is the more appropriate legal option.

How To Annul A Marriage In Ontario

If you are wondering how to annul a marriage, the process typically involves applying to the court for a declaration that the marriage is invalid.

The key steps generally include the following.

1. Determine If Legal Grounds Exist

The first step is confirming that valid legal grounds for an annulment exist. Not every unhappy or short marriage qualifies for annulment.

This is where seeking counsel from a family lawyer can help. They will review the circumstances of the relationship and assess whether the marriage meets the legal criteria for annulment in Ontario.

2. Prepare A Court Application

The next step is filing a legal application with the appropriate Ontario court. This application asks the court to declare the marriage invalid.

The application will outline:

The details of the marriage
The specific legal grounds for annulment
Supporting facts and evidence

You may need to present documentation to support the claim.

3. Serve The Other Party

The spouse must be formally notified of the application. This process is known as service.

The other party has the opportunity to respond and either agree or contest the annulment request.

4. Court Review And Decision

If the application is contested, the case may proceed to court, where a judge will review the evidence and determine whether the marriage should be annulled.

If the court agrees that the legal requirements are met, it will issue a declaration that the marriage is invalid.

The final result is a court order stating that the marriage never legally existed.

Annulment vs Divorce In Ontario

People sometimes assume annulment is a quicker or easier alternative to divorce. However, this is not necessarily the case.

Key differences include:

Annulment

Requires proof that the marriage was legally invalid
Declares the marriage never existed
Available only in limited circumstances

Divorce

Ends a valid marriage
Does not require proving the marriage was invalid
Available after meeting legal requirements, such as separation

In many situations, divorce is the more straightforward legal option because it does not require proving the marriage was defective.

A family lawyer can help determine which path best fits your circumstances.

Legal Issues That May Still Arise

Even when a marriage is annulled, certain legal issues may still need to be resolved.

For example:

Property disputes between spouses
Financial support claims
Parenting arrangements if children are involved

The court may still address these matters under family law principles to ensure fairness and protect the interests of any children.

Marriage Annulment In Ontario: Understanding Your Legal Options

If you are potentially seeking a marriage annulment, your first step is to determine whether you meet the legal requirements and have the evidence you need. Consulting a family law lawyer as soon as possible can help clarify your options and determine the best legal path forward.

The experienced Kelly Jordan Family Law team can review the facts of your situation, explain whether an annulment is possible, and guide you through the court process if appropriate.

Contact us online or call our Toronto offices at 416-849-5501 to schedule a consultation, so that we can provide the guidance and support you need.

References:

Government of Canada. Annulment of Marriages Act (Ontario).

Community Legal Education Ontario (CLEO). An Introduction To Family Law In Ontario.

Community Legal Education Ontario (CLEO). Family Law Resources And Legal Help.

Government of Canada. Marriage (Prohibited Degrees) Act

Government of Canada. Civil Marriage Act