What Happens to My Condo If I Get Married in Ontario?

If you own a condo in Ontario and you're getting married, your pre-marriage equity is at risk in a way most people don't expect. Under the Family Law Act R.S.O. 1990, c. F.3, a home that becomes the matrimonial home loses its pre-marital equity deduction — meaning your partner could be entitled to share equity you built before you ever met them.

What makes a condo a "matrimonial home" in Ontario?

A matrimonial home is any property ordinarily occupied by both spouses as their family residence at the time of separation. That's it. It doesn't matter if you bought it before you were married, whose name is on the title, or whether your partner contributed a single dollar toward it.

If your condo is where you live together as a couple when you separate, it qualifies. This is true even if the marriage was short, even if you owned the property for a decade before you met your partner, and even if your partner has never made a mortgage payment.

One nuance: you can have more than one matrimonial home. If a couple regularly uses a cottage as a family residence, it can also qualify — giving the condo rule extra reach for property owners with multiple homes.

What the law actually says — and why most people are surprised

Under section 4(1) of the Family Law Act, the value of a spouse's ownership interest in the matrimonial home on the date of marriage cannot be deducted as an excluded asset when calculating net family property.

Here's why that surprises people. Every other pre-marriage asset — an RRSP, a car, a savings account, an investment portfolio — can be deducted as your pre-marriage value in the equalization calculation. You subtract what you brought in, and only the growth during the marriage is shared. The matrimonial home is the only asset where that deduction doesn't apply. Your pre-marriage equity enters the calculation at zero, and your partner is entitled to share in the full separation-date value.

What that looks like in practice:

You buy a condo in Toronto for $500,000 before the marriage. Your equity at the time is $200,000. During the marriage the condo appreciates to $900,000 and your equity grows to $800,000. At separation — the date courts use to value net family property — without a marriage contract, your partner is entitled to share in the equalization of the entire $800,000. The $200,000 you built before they were in the picture is not excluded.

This is the rule that catches people off guard. "I owned it before we married" is the most natural assumption in the world. In Ontario, it doesn't hold.

What if my partner is on the mortgage but not on the title?

Being on the mortgage doesn't create ownership — only title does. A partner whose name appears on the mortgage but not on the title does not have a formal ownership interest in the property.

However, contributions toward the mortgage, renovations, or other improvements can give rise to equitable claims in certain circumstances — unjust enrichment arguments, for example, which common-law couples sometimes use to claim a share of a home they helped build financially. This is a reason to have clarity about the arrangement in writing, not a reason to assume contributions create no risk. A marriage contract addresses this directly by defining exactly what each person's contributions mean and what they're entitled to.

What a marriage contract can — and can't — do

A marriage contract gives you several tools to address the matrimonial home rule directly.

It can define your pre-marriage equity as excluded from equalization — essentially instructing the court to treat the $200,000 you brought in the way it would treat any other pre-marriage asset. It can set a custom sharing formula for appreciation during the marriage, so growth is shared in a defined proportion rather than entirely. It can also offset the home's equity against other assets, so you're not forced to sell the condo to satisfy an equalization payment.

What a marriage contract cannot do: remove your spouse's right to live in the home during the marriage. Under section 26(1) of the Family Law Act, both spouses have equal rights of possession of the matrimonial home regardless of whose name is on the title and regardless of what any contract says. The contract governs the financial outcome at separation — not who can occupy the home while the marriage continues.

What about the workarounds — putting it in a corporation, a trust, keeping it in your name only?

Because this rule is so counterintuitive, people look for structural ways around it. Putting the property into a corporation, using a bare trust, or keeping title solely in one name. Courts look past these structures when determining what qualifies as a matrimonial home — they look at who actually lives in and controls the property, not just whose name is on the title documents.

These approaches carry meaningful legal and tax risk and are not a reliable substitute for a marriage contract. The only credible solution under Ontario law is a properly drafted marriage contract with full financial disclosure and Independent Legal Advice.

How to protect yourself

The process is straightforward. Before the wedding — ideally 60–90 days out — both you and your partner retain separate Ontario family lawyers and prepare full financial disclosure. Your lawyer drafts a marriage contract defining how your pre-marriage equity is treated. Both parties receive independent legal advice and sign ILA certificates. Both parties sign the agreement with a witness present.

That's how a marriage contract works under Ontario's Family Law Act. For a detailed breakdown of what that price covers, see how much a marriage contract costs in Ontario.

Frequently Asked Questions

I'm not married yet — is it too late to protect my condo's equity?

No. The time to act is before the wedding. A marriage contract must be signed before the marriage to define how the matrimonial home equity is treated at separation. The earlier the better — agreements signed in the final days before a wedding are more vulnerable to challenge on the grounds of duress than those negotiated months in advance.

Does the matrimonial home rule apply to a cottage or second property?

Yes, if the property is ordinarily occupied as a family residence. A principal home and a cottage used regularly by the family can both qualify as matrimonial homes simultaneously. A marriage contract can address both — defining pre-marriage equity protection for each property.

What if I'm renting now and we plan to buy together after marriage?

Different situation. Property purchased jointly after marriage is typically treated as jointly acquired family property — that's the rule working as most people expect. The matrimonial home rule's most consequential application is to property you owned before the marriage that becomes the matrimonial home.

Does adding my partner to the title change anything?

Adding your partner to the title doesn't make your equity situation worse under Ontario's matrimonial home rule — the home wasn't deductible anyway. But it does create shared legal ownership, which has separate implications for mortgage liability, what happens if one of you dies, and how the property is handled at separation. It's a distinct decision that warrants its own legal advice.

Can I get a marriage contract after we're already married?

Yes — a postnuptial agreement is valid in Ontario under the same Family Law Act framework. The same requirements apply: written, signed, witnessed, with full financial disclosure and Independent Legal Advice for both parties. Courts apply slightly more scrutiny because existing legal rights are being modified. See postnuptial agreements in Ontario for details.

Does this rule apply in other provinces?

Ontario's s. 4(1) rule is the most counterintuitive in Canada. In BC, pre-relationship property is excluded property under the Family Law Act SBC 2011 — but the growth in value during the relationship is family property, which still surprises many people. Alberta is more flexible. The family home gets special treatment across Canada, but Ontario's blanket removal of the pre-marriage deduction is the harshest version of the rule.

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This article provides general information about Ontario family law and does not constitute legal advice. For advice specific to your situation, consult a licensed Ontario lawyer.