Divorce vs Annulment in Ontario: What's the Difference and Which Do You Need?

People sometimes ask about getting a marriage "annulled" rather than divorced — often because of religious reasons, because the marriage was very short, or because they believe something went wrong at the time of the marriage. The distinction between divorce and annulment in Ontario is a legal one, not simply a matter of preference, and it is important to understand what each actually does before assuming one applies to your situation.

The short version: divorce ends a valid marriage; annulment is a court declaration that the marriage was never legally valid to begin with. Qualifying for annulment requires meeting specific legal tests that most people do not meet.

What Is a Divorce?

A divorce is a court order that formally dissolves a legally valid marriage. It is available under Canada's Divorce Act (federal legislation), which applies to legally married spouses throughout Canada. The most common ground for divorce in Ontario is one-year separation — proving that you and your spouse have been living separate and apart, with at least one of you intending the marriage to be over, for at least 12 consecutive months.

After a divorce order is granted and the 31-day appeal period passes, both former spouses are legally free to remarry. They receive a certificate of divorce as proof.

What Is an Annulment?

An annulment is a court declaration that a marriage was void (never legally valid in the first place) or voidable (technically valid but capable of being undone because of a specific defect). After an annulment, the law treats the marriage as though it never existed.

Annulment in Ontario is granted by the Superior Court of Justice applying common law principles, continued in force by the federal Annulment of Marriages Act (Ontario) and supplemented by the capacity rules in the federal Civil Marriage Act and Marriage (Prohibited Degrees) Act (there is no single statute setting out the grounds and process the way the Divorce Act does for divorce). This makes it distinct from a divorce.

Two Types of Marriages That Can Be Annulled

Void Marriages

A void marriage is one that was never valid and is treated as having no legal effect from the start. No court order is technically needed to establish that it is void, though a court declaration provides certainty. Void marriages in Ontario typically arise when:

• One party was already married to someone else (bigamy). A second marriage is automatically void if the first was never dissolved.
• The parties are too closely related — marriage between lineal relatives (such as a parent and child) or between brothers and sisters, including half-siblings and relatives by adoption, is prohibited.

Voidable Marriages

A voidable marriage was technically valid but can be declared a nullity by a court if the right grounds exist. Voidable marriages are less common and the grounds are specific. Courts have recognized grounds such as:

• Incapacity to consummate: If the marriage was never consummated because one spouse was incapable of consummating it, whether physically or through a psychological aversion, and one spouse seeks annulment on this basis. A refusal to consummate, on its own, is not a ground.
• Inability to consent: One party lacked the mental capacity to understand or consent to the marriage at the time of the ceremony — for example, due to a serious mental illness or intoxication.
• Duress or fraud: One party was forced into the marriage, or was deceived about a fundamental matter that they would not have accepted had they known (the bar here is high — fraud about minor matters does not qualify).
• Underage: A party who was under the legal age for marriage at the time.

Common Misconceptions About Annulment

"Our marriage was short, so we can get an annulment"

The length of the marriage is not a ground for annulment. A marriage of one week that was validly entered into can only be ended by divorce, not annulment. The only exception is if one of the legal grounds above also happens to apply.

"We never lived together, so it's not a real marriage"

Not living together after the ceremony does not void a marriage. You may have a ground for annulment if one spouse was incapable of consummating the marriage — but this is different from simply not sharing a home.

"Annulment is faster than divorce"

This is rarely true. An annulment requires going to court to prove specific legal grounds, and the process can be complex. An uncontested divorce, by contrast, is often processed on paper without a hearing once the one-year separation is complete.

Religious Annulments

Some faith traditions — most notably the Roman Catholic Church — have their own internal annulment processes. A religious annulment is a spiritual matter within the church and has no effect on your legal marital status under Ontario or Canadian law. You will still need either a civil divorce or a civil annulment to be legally free to remarry.

Similarly, a civil divorce has no effect on your status within a religious community that does not recognize civil divorce. These are parallel systems that operate independently.

Practical Implications: Why the Distinction Matters

For most practical purposes, divorce and annulment lead to the same result — you are no longer married. However, there are some differences to be aware of:

• Spousal support: Ontario's Family Law Act defines "spouse" in ways that may affect support entitlement. A declared-void marriage may affect these rights differently than a divorce. Legal advice specific to your situation is important here.
• Property rights: The matrimonial home regime and the equalization of net family property under Ontario's Family Law Act apply to married spouses. If a marriage is declared void from the start, property rights may need to be addressed differently.
• Immigration: Annulment versus divorce can have different implications for immigration status. If your marriage was connected to an immigration sponsorship, speak with an immigration lawyer as well as a family lawyer.

Frequently asked questions