What Happens to a Marriage Contract If the Marriage Is Annulled in Ontario?

Annulment is rare compared to divorce, but it raises a genuinely hard question for anyone who also signed a marriage contract: if the law treats the marriage as though it never properly existed, does the contract signed around it still mean anything? The honest answer is that marriage contract validity after an annulment depends heavily on the specific facts — this is an area to get advice on early rather than assume either outcome.

Annulment is legally different from divorce. Divorce ends a marriage that was validly formed. An annulment is a court finding that a marriage was never valid at all, or is being treated as invalid from a particular point. That distinction matters for what happens next, including to any marriage contract signed in connection with the marriage.

Void vs. Voidable: Why the Distinction Matters First

• A void marriage is treated, in the eyes of the law, as though it never validly existed at all — for example, where a basic legal requirement for marriage was missing from the outset.
• A voidable marriage is treated as a valid marriage unless and until a court annuls it, meaning it has legal effect up to that point.
• Which category a marriage falls into is a legal determination made on the specific facts. It isn't something to assume based on how the couple feels about the relationship or how the wedding was conducted.

What Generally Happens to a Marriage Contract

Because a marriage contract is a separate legal document from the marriage itself, an annulment doesn't automatically erase it. But it can raise real questions about whether the contract was ever intended to operate outside a valid marriage, and whether its terms still make sense if the marriage is treated as if it never existed. Whether all, part, or none of the contract survives typically depends on:

• What the contract itself says its trigger or scope is — some are drafted only "on separation or divorce" and may not clearly address annulment at all
• Whether the marriage was void or voidable
• General contract principles about whether a fundamental assumption behind the agreement — a valid, ongoing marriage — turned out to be mistaken

A Contract Can Still Matter Even If the Marriage Doesn't Count

Even where an annulment removes the marriage's legal status, the underlying document is still a contract the parties signed, and general contract law doesn't necessarily disappear just because the marriage does. Provisions dealing with property the couple already divided, or debts one party agreed to take on, can still carry practical weight between the parties, even outside the family law framework that assumes a valid marriage — though relying on this without legal advice is risky given how fact-specific it is.

The Overlap With Spousal Support Law

One useful point here: Ontario's spousal support rules under the Family Law Act don't only apply to validly married spouses. An unmarried partner can qualify as a "spouse" for spousal support purposes if the couple cohabited continuously for the minimum period the Act requires, or are in a relationship of some permanence and have a child together. That means someone whose marriage is later found void or annulled may still be able to pursue a spousal support claim on this separate basis, depending on how long and how the couple actually lived together — entirely apart from whatever the marriage contract itself says.

What to Do If This Applies to You

1. Don't assume the marriage contract is automatically void, or automatically still binding — treat it as an open question.
2. Gather the marriage contract, plus details of how long you cohabited and in what circumstances, before your first consultation.
3. Ask specifically whether your situation involves a void or a voidable marriage, since the two lead to different starting points.
4. Ask whether you may have an independent claim, like spousal support, that doesn't depend on the marriage contract or the marriage's validity at all.

Frequently asked questions