Canada doesn’t have a single, national law governing prenuptial agreements. Instead, each province and territory has its own rules for how marriage contracts are created, what they can cover, and how they’re enforced. A prenup drafted in Ontario follows different rules than one in B.C., which is different from Alberta, which is entirely different from Quebec.
If you’re creating a prenup, you need to understand the rules in your province. And if there’s any chance you might move, you need to plan for that too.
Ontario: Marriage Contracts Under the Family Law Act
In Ontario, prenups are called marriage contracts and are governed by Section 52 of the Family Law Act. They must be in writing, signed by both parties, and witnessed. Couples can contract about property division, spousal support, and most financial matters. However, they cannot contract about decision making responsibility and parenting time, and they cannot limit a spouse’s right to possession of the matrimonial home. Ontario’s equalization system means that, without a prenup, each spouse is entitled to an equal share of the net family property accumulated during the marriage. The matrimonial home receives special treatment and is not excluded from equalization, even if one spouse owned it before the marriage. A marriage contract lets you override these defaults. For more on Ontario’s specific rules, see What Is a Prenup in Ontario? Myths vs. Reality.
British Columbia: Family Law Act Agreements
B.C.’s Family Law Act, which came into effect in 2013, treats prenups as “agreements respecting property division.” Like Ontario, B.C. distinguishes between property brought into the relationship and the growth that occurs during it.
While excluded property, such as assets owned before the relationship or received by gift or inheritance, is generally kept by the original owner, any increase in value during the relationship is typically shared between spouses. This means that, similar to Ontario, you effectively receive credit for the value at the start of the relationship, but the growth may still be subject to division.
Alberta: Matrimonial Property Act
Alberta’s Matrimonial Property Act allows couples to opt out of the default property division scheme through a prenuptial agreement. The agreement must be in writing and signed by both parties. Alberta courts will consider whether both parties had independent legal advice, whether there was full disclosure, and whether the agreement is fair at the time of enforcement — not just at the time of signing.
Notably, Alberta courts have broader discretion to set aside agreements they find “unfair” at the time of enforcement, making it especially important that Alberta prenups are balanced, well-documented, and updated over time.
Quebec: A Completely Different System
Quebec operates under a civil law system, not common law, and prenups work fundamentally differently here. Rather than defining specific property divisions, Quebec couples choose a “matrimonial regime” — either partnership of acquests (the default, where property acquired during marriage is shared) or separation as to property (where each spouse keeps what they earned).
Quebec prenups (called marriage contracts) must be notarized by a Quebec notary, not just signed before a witness. This adds formality and cost but also provides strong evidentiary protection. Once notarized, Quebec marriage contracts are extremely difficult to challenge.
The Prairies, Atlantic Canada, and the Territories
Saskatchewan’s Family Property Act and Manitoba’s Family Property Act both allow prenuptial agreements but require independent legal advice and signed acknowledgements for enforceability. Manitoba’s approach is particularly formal, requiring both signatures and lawyer certifications.
The Maritime provinces — New Brunswick, Nova Scotia, and Prince Edward Island — each have their own legislation governing marriage contracts, with varying requirements around disclosure, legal advice, and witnessing. The territories follow their own statutory frameworks, generally aligned with common law principles but with important local variations that couples should verify.
What If You Move Provinces?
This is one of the most important and least discussed issues in Canadian family law. A prenup drafted in Ontario may not be fully enforceable if you move to B.C. or Alberta. Property rights are governed by provincial law, and a court in your new province may apply its own standards to evaluate your agreement. If you’re planning to relocate — or if there’s a reasonable chance you might — your prenup should include a choice-of-law clause specifying which province’s law governs the agreement. It’s not a guarantee that a court in another province will honour it, but it significantly strengthens your position. For information on when and how to update your agreement after a move, see How to Update or Amend Your Prenup After Major Life Changes.
No matter where you live in Canada, a marriage contract is a smart move. Start yours at I Do Prenup.
Frequently Asked Questions
Q: Which province has the strictest prenup rules?
Quebec requires notarization, making it the most formally demanding. Alberta courts have the broadest discretion to set aside agreements they find unfair at the time of enforcement.
Q: Can my Ontario prenup be enforced in B.C.?
Potentially, but B.C. courts will apply their own Family Law Act standards. A choice-of-law clause and independent legal advice in both provinces strengthen enforceability.
Q: Do all provinces allow prenups?
Yes. Every Canadian province and territory recognizes some form of domestic contract that allows couples to define property division and spousal support terms.
Q: Do common-law couples need a different type of agreement?
Common-law couples typically use cohabitation agreements rather than marriage contracts. The rights and protections vary significantly by province. Learn more in Prenups and Common-Law Couples: What’s Covered, What’s Not.