Marriage Contracts and Prenups in Ontario

A marriage contract sorts out money before it becomes a fight. In Ontario, a "prenup" is not a separate legal animal. It is a marriage contract, a type of domestic contract under section 52 of the Family Law Act. Couples sign one to decide in advance how they will divide property, handle debts, and deal with spousal support if the marriage ends. Done right, it saves you the cost and stress of litigating those questions later.

Here is what a marriage contract can and cannot do in Ontario, when it holds up, and when a court can throw it out.

What is a marriage contract in Ontario?

A marriage contract is a written agreement between two people who are married or who intend to marry. The rules sit in section 52 of the Family Law Act. If you are not married but living together, the equivalent agreement is a cohabitation agreement under section 53. A cohabitation agreement automatically becomes a marriage contract the moment the couple marries, so you do not need to redo it on the wedding day.

To be valid, the contract must be in writing, signed by both parties, and each signature witnessed. A verbal promise or a note on the fridge does not count.

What can a marriage contract cover?

A marriage contract can deal with how you divide property and handle equalization of net family property if you separate. It can address what happens to specific assets, like a business, an inheritance, or a home one spouse owned before the marriage. It can set out how debts are shared. It can also fix the terms of spousal support, including waiving it, capping it, or setting an amount.

One firm limit: you cannot contract out of a spouse's right to possession of the matrimonial home. Even if one spouse owns the home outright, both spouses have an equal right to stay in it under the Family Law Act, and a marriage contract cannot strip that right away. You can deal with who owns or who gets the value of the home, but not the right to live there.

What can a marriage contract not decide?

A marriage contract cannot lock in anything about the children. You cannot use it to predetermine decision-making responsibility or parenting time, what used to be called custody and access. You also cannot fix or waive child support. Those questions belong to the children, not the parents, and a court decides them based on the children's best interests at the time of separation. A clause in your contract that tries to settle parenting or child support is unenforceable, and a judge will ignore it.

This catches people off guard. You can agree on everything about your money and still have no say, in advance, over how a court will handle the kids.

When will a court set a marriage contract aside?

Signing a contract does not guarantee a court enforces it. Under section 56 of the Family Law Act, a judge can set aside all or part of a marriage contract in three situations.

First, if a spouse did not disclose significant assets or debts that existed when the contract was signed. If you hid a property, a pension, or a pile of debt, the deal is exposed. Second, if a spouse did not understand the nature or consequences of the contract. Third, if the contract was signed under duress, pressure, or without a real chance to think it through, such as a document put in front of someone the night before the wedding.

Two things protect a contract from these attacks: full financial disclosure on both sides, and independent legal advice for each spouse. When each person has their own lawyer and a clear picture of the other's finances, it is far harder to argue later that the deal was unfair or uninformed.

When you actually need one

Not every couple does. A marriage contract earns its keep when there is something specific to protect: a business, a professional practice, an inheritance you want to keep separate, children from a previous relationship, or a large gap in assets or debts between the two of you. Second marriages are a common reason, because people come in with property and want to keep it sorted for their kids.

If you are both starting from zero with no dependents, a contract may be more cost than benefit. The honest answer depends on what you are bringing in and what you want to walk out with.

How a marriage contract fits with separation

A marriage contract is forward-looking. It sets the rules before or during the marriage. A separation agreement is the opposite end: it settles the terms once you have decided to split. A solid marriage contract makes the separation agreement faster and cheaper, because the big questions are already answered. The two work as a pair.

How Ryan helps

Ryan Manilla drafts and reviews marriage contracts for couples across Toronto and the GTA on a flat fee, so you know the cost up front with no hourly surprises. He makes sure the contract meets the section 52 requirements, that disclosure is complete on both sides, and that the terms will hold up if they are ever tested. If you are on the receiving end of a contract, he reviews it and gives you the independent legal advice that protects your position.

The first consultation is free. Book one to talk through whether a marriage contract makes sense for you and what it should cover. Contact Ryan to get started.