Prenuptial Agreements in Ontario: Are They Worth It?

Not Just for Celebrities and Billionaires

Prenuptial agreements — known in Ontario as “marriage contracts” — have historically had a reputation as documents reserved for the very wealthy or for those who expect their marriages to fail. That perception is outdated. In modern Canada, more couples than ever are choosing to enter marriage with a thoughtful, clear-eyed agreement about how finances will work — both during the marriage and in the event it ends.

This guide explains what a prenuptial agreement is, what it can (and cannot) do in Ontario, and why it might be a smart choice for many couples — not just the rich and famous.

What Is a Marriage Contract?

Under Ontario’s Family Law Act, a marriage contract is a written agreement between two people who are married or intend to marry. It sets out how the couple will deal with various matters during the marriage and, importantly, on separation, divorce, or death. Common topics include:

• Division of property if the marriage ends
• Treatment of specific assets (e.g., a business, an inheritance, a family home)
• Spousal support — whether it will be paid, in what amount, and for how long
• Responsibility for debts brought into the marriage
• Estate-planning provisions and how property is to be dealt with on death

Who Should Consider a Marriage Contract?

Prenuptial agreements are particularly worth considering in the following situations:

• One or both spouses own a business that they want to protect
• There is a significant disparity in wealth or income between the spouses
• One or both spouses have children from a previous relationship
• One spouse has substantial inherited or expected family wealth
• This is a second or subsequent marriage
• One spouse plans to leave the workforce to raise children
• There are significant pre-existing debts
• The spouses come from different cultural or legal traditions

What a Marriage Contract Cannot Do

There are firm limits to what a marriage contract can cover in Ontario. The most important:

Children: A marriage contract cannot pre-determine matters related to decision-making responsibility, parenting time, or child support. These issues are decided at the time of separation based on the best interests of the child.

Right to Possess the Matrimonial Home: A marriage contract cannot eliminate a spouse’s right to possess the matrimonial home during the marriage.

Unconscionable Terms: Courts can refuse to enforce provisions of a marriage contract that are unconscionable, especially regarding spousal support.

Requirements for an Enforceable Marriage Contract

Not all marriage contracts will hold up in court. To be enforceable, an Ontario marriage contract must satisfy several requirements:

• It must be in writing, signed by both parties, and witnessed
• Both parties must provide full and complete disclosure of their assets, debts, and incomes
• Each party must have an opportunity to obtain independent legal advice
• Neither party may have signed under duress or undue pressure
• The terms must not be unconscionable at the time of enforcement

Marriage contracts signed under pressure on the eve of a wedding — without proper disclosure or independent legal advice — are often successfully challenged later.

Common Myths About Prenuptial Agreements

Myth: A prenup means you don’t trust your partner

Reality: A well-drafted marriage contract is a sign that two adults have had a serious conversation about finances, expectations, and shared goals. Many couples find the process strengthens their relationship by fostering open communication.

Myth: Prenups are only for the wealthy spouse

Reality: Marriage contracts can also protect the financially weaker spouse by guaranteeing certain financial outcomes — for example, guaranteed support or a share of specific property — that might not otherwise be available under default family law rules.

Myth: Once signed, prenups are ironclad

Reality: Marriage contracts can be challenged on the grounds described above. Courts will sometimes vary or set aside contracts that produce unfair results, particularly regarding spousal support.

Postnuptial Agreements

A marriage contract does not have to be signed before the wedding. Many couples enter into postnuptial agreements — sometimes after years of marriage — when financial circumstances change, when starting a business, or when receiving an inheritance. The same legal requirements apply.

Cohabitation Agreements for Unmarried Couples

If you are not getting married but living together, you may want a cohabitation agreement instead. These are very similar in form and function to marriage contracts and serve the same protective purpose for common-law relationships.

Why This Matters to You

A well-drafted marriage contract or cohabitation agreement is one of the most cost-effective forms of family law protection you can have. The legal fees to negotiate and prepare an agreement are typically a tiny fraction of what a contested family law dispute would cost — and the peace of mind is significant.

The Toronto family lawyers at Soica & Associates draft marriage contracts, cohabitation agreements, and postnuptial agreements tailored to each client’s situation.

This article is intended for general informational purposes only and does not constitute legal advice. Laws may change, and outcomes vary depending on individual circumstances. Please consult a qualified family law lawyer at Soica & Associates for guidance specific to your situation.