Prenuptial Agreements in Canada: What They Cover, What They Cost, and How to Get One

Marriage contracts, commonly called prenuptial agreements or prenups, are legal agreements between two people who are about to marry. They set out how property, debts, and spousal support will be handled if the marriage ends. In Canada, prenups are legal, enforceable, and increasingly common. Far from being a sign of distrust, a well-drafted prenup is a practical tool that protects both parties and reduces conflict if the relationship doesn't work out.

This guide covers what prenuptial agreements can and can't do, how much they cost, what makes them enforceable, and when you should consider getting one. If you're already going through a separation and need to divide property, see our guide to property division in Canada.

What Is a Prenuptial Agreement?

A prenuptial agreement is a legally binding contract between two people who plan to marry. It's signed before the wedding and outlines how financial matters will be handled during the marriage and in the event of separation or divorce. The agreement can address property division, spousal support, debt allocation, and other financial issues.

The terminology varies by province. In Ontario, they're called "marriage contracts" under the Family Law Act. In other provinces, they may be referred to as "domestic contracts," "prenuptial agreements," or simply "prenups." Regardless of the name, they serve the same purpose: providing certainty about financial rights and obligations.

What a Prenup Can Cover

Prenuptial agreements in Canada can address a wide range of financial matters. They're particularly useful when one or both partners bring significant assets, debts, or business interests into the marriage.

What a Prenup Cannot Cover

Canadian courts have consistently held that agreements about children are not binding because the best interests of the child must be assessed at the time of separation, not years earlier. Similarly, child support is the right of the child, not the parent, and cannot be waived by agreement.

Some provinces also limit the ability to completely waive spousal support. Courts may set aside a spousal support waiver if it would leave one spouse in financial hardship or on social assistance. The general principle is that a prenup should be fair, not leave one party destitute.

Requirements for Enforceability

For a prenuptial agreement to hold up in court, it must meet certain requirements. These vary somewhat by province, but the core principles are consistent across Canada:

Provincial Requirements

The Importance of Independent Legal Advice

Independent legal advice (ILA) means that each party has their own lawyer review the agreement and explain its implications. While ILA isn't technically mandatory in every province, a prenup signed without it is significantly more vulnerable to being set aside. Courts view the absence of independent legal advice as a red flag that one party may not have fully understood what they were agreeing to.

When a Court Can Set Aside a Prenup

Prenuptial agreements are generally upheld in Canada, but courts do have the power to set them aside in certain circumstances. Understanding what can invalidate a prenup helps you create one that will hold up:

Unconscionable Terms

If the terms of the agreement are so one sided that they're considered unconscionable (grossly unfair), a court may refuse to enforce them. This doesn't mean the agreement has to be perfectly equal, but it can't be so lopsided that it shocks the conscience of the court.

Failure to Disclose Assets

Both parties must provide full and honest financial disclosure when entering into a prenup. If one party hides assets, understates their income, or fails to disclose significant debts, the entire agreement can be set aside. This is one of the most common reasons prenups are challenged.

Lack of Understanding

If one party didn't understand what they were signing, whether because of language barriers, lack of legal advice, or the complexity of the document, the court may find that there was no true consent. This is why independent legal advice is so important.

Duress or Coercion

An agreement signed under pressure is not truly voluntary. Classic examples include presenting the prenup the night before the wedding with a "sign or the wedding's off" ultimatum, or pressuring a financially dependent partner to sign without giving them time to get legal advice. Courts look at the surrounding circumstances, including the timing of the signing, to assess whether there was genuine consent.

How Much Does a Prenup Cost?

The cost of a prenup in Canada depends on the complexity of your financial situation. Remember that each party needs their own lawyer, so you're paying for two sets of fees.

While these costs may seem significant, they're a fraction of what a contested divorce costs. A prenup that clearly defines property division and support can save tens of thousands of dollars in legal fees if the marriage ends. For perspective, see our guide to divorce lawyer costs.

When to Get a Prenup

A prenup isn't just for wealthy people. There are many situations where a marriage contract makes practical sense:

Business Owners

If one or both partners own a business, a prenup can specify how the business will be valued and divided in the event of a divorce. Without a prenup, a court will include the value of the business in the property division calculation, which could force a sale or buyout. A prenup can protect the business and its operations while still ensuring the other spouse is treated fairly. See our guide to divorce and business ownership for more.

Significant Difference in Assets or Debts

When one partner brings significantly more assets (or more debt) into the marriage, a prenup can clarify what belongs to whom and protect the wealthier partner from an unfair division while still providing for the other partner.

Second Marriages With Children

People entering a second marriage often have children from a prior relationship and want to protect certain assets for their children's inheritance. A prenup can ensure that specific property passes to your children rather than being divided with a new spouse.

Family Property and Inheritances

If you've received or expect to receive a significant inheritance or gift from family, a prenup can ensure that this property remains excluded from division. While inherited property is often excluded by default under provincial law, commingling inherited funds with marital property (for example, depositing an inheritance into a joint account) can blur the lines.

Resources and Next Steps

A prenuptial agreement is one of the most effective ways to protect both partners' interests and reduce the potential for conflict. If you're considering a prenup, a family lawyer can help you understand your rights, draft an agreement that's fair and enforceable, and ensure that both parties' interests are protected.

Browse family lawyers across Canada to find a lawyer who can help you create a prenup that works for your situation.

This content is for informational purposes only and does not constitute legal advice. Laws vary by province and individual circumstances. Consult a qualified family lawyer for advice specific to your situation.