Yes, married couples in Ontario can enter into a marriage contract after their wedding. Although a prenuptial agreement is typically signed before marriage, a similar agreement created after marriage is commonly called a postnuptial agreement or postnup.
Under section 52 of Ontario’s Family Law Act, spouses who are already married can enter into a marriage contract addressing certain financial rights and responsibilities.
These agreements can help couples establish expectations regarding property, debts, and financial obligations if their relationship ends.
However, a postnuptial agreement must satisfy Ontario’s legal requirements to be enforceable.
What Is the Difference Between a Prenup and a Postnup in Ontario?
The primary difference between a prenuptial agreement and a postnuptial agreement is when the contract is signed.
A prenup is created before marriage, while a postnup is created after the couple is legally married.
In Ontario, both generally fall under the legal category of marriage contracts.
These agreements may address property ownership, financial obligations, and potential spousal support arrangements.
For more information about agreements prepared before marriage, visit our Toronto prenuptial agreement lawyers page.
What Can a Postnuptial Agreement Cover in Ontario?
A postnuptial agreement can address several important financial matters, including ownership and division of assets, responsibility for debts, business interests, and potential spousal support obligations.
For example, a couple may wish to clarify what happens to a family business or certain investments if they eventually separate. However, there are legal limitations.
Under Ontario’s Family Law Act, a marriage contract cannot enforceably limit a spouse’s statutory rights relating to possession of the matrimonial home.
Marriage contracts also cannot determine decision-making responsibility or parenting time for children.
These restrictions make it important to understand which terms may be legally enforceable.
Is a Postnuptial Agreement Legally Binding in Canada?
A properly prepared postnuptial agreement can be legally enforceable in Ontario.
Under section 55 of the Family Law Act, domestic contracts must be in writing, signed by both parties, and witnessed.
However, meeting these formal requirements does not guarantee that a court will enforce every provision.
Under section 56, a court may set aside a domestic contract in certain circumstances, including where a spouse failed to disclose significant assets or debts, or where a party did not understand the nature or consequences of the agreement.
Both spouses should consider obtaining independent legal advice before signing.
Can You Get a Postnup if You Already Own a Home Together?
Yes. Married couples who already own a home together may create a postnuptial agreement addressing certain property-related rights and financial arrangements.
However, Ontario provides specific protections for matrimonial homes.
For example, a marriage contract cannot remove a spouse’s rights to possession of a matrimonial home under Part II of the Family Law Act.
The distinction between ownership, possession, and property division can have important legal consequences.
Couples should obtain legal advice before attempting to include provisions concerning their home.
Do Both Spouses Have to Agree to a Postnuptial Agreement?
Yes. A marriage contract requires the agreement and signatures of both spouses.
One spouse cannot unilaterally impose a postnuptial agreement on the other.
Both parties should have an opportunity to review the proposed terms, understand their financial implications, and obtain legal advice.
Full financial disclosure is also important. Providing accurate information about income, assets, debts, and other financial interests can help reduce the risk of future disputes.
Our article on common mistakes when creating a prenuptial agreement discusses issues that can affect domestic contracts.
Speak With a Toronto Marriage Contract Lawyer
Whether you have recently married or have been married for several years, a postnuptial agreement may help clarify your financial expectations.
At Gelman & Associates, our Toronto marriage and common law lawyers assist couples with marriage contracts, postnuptial agreements, and other types of domestic contracts.
Contact Gelman & Associates at 1-844-736-0200 to book a consultation and discuss your options for creating a marriage contract in Ontario.








