Does Paying the Mortgage Give a Common-Law Partner Ownership in Ontario?

You've been putting money toward the mortgage for years, maybe covering it entirely some months — but your name was never added to the title. If the relationship ends, does that history of payments buy you a share of the house? Many common-law partners assume it must. Under Ontario law, paying the mortgage does not, by itself, give you ownership of a property titled to someone else. What it might give you is the basis for a legal claim — a very different, and much less certain, thing.

The Short Answer: Ownership Follows Title, Not Payments

Legal ownership of real property in Ontario is determined by whose name is on title at the land registry, not by who paid for it. This is true across the board — for married spouses, too — though married spouses get a separate statutory backstop through the Family Law Act's equalization process that can offset an unequal title split. Common-law partners have no equivalent statutory safety net. If your name isn't on title, you don't own the property just because you've been paying toward it.

Why Financial Contribution Alone Isn't Enough

Courts don't treat "I paid for it" as automatic proof of a property interest, because a payment can arise from many different underlying arrangements: a gift, a rent-like way of sharing household costs, a loan, or a genuine shared intention to build equity together. The fact of payment alone doesn't tell anyone which of those it actually was — that requires looking at the fuller picture.

The Legal Paths That Can Create an Ownership Interest

Resulting and constructive trust claims

A partner who contributed significantly toward a property they don't hold title to may be able to ask a court to recognize a trust interest in that property, based on the contribution made and the parties' actual intentions at the time.

Unjust enrichment claims

This broader doctrine applies where one partner has been enriched, the other has been correspondingly deprived, and there's no legal reason — such as a gift — that justifies the enriched partner keeping the benefit without compensating the other. An unjust enrichment claim doesn't require holding title at all, and can lead to a monetary award or, in some circumstances, a recognized share of the property's value.

What a Court Typically Looks At

• The nature and extent of financial contributions made
• Whether contributions were direct (toward the mortgage or purchase price) or indirect (covering household expenses that freed up the other partner's income)
• Any evidence of what the partners actually intended regarding ownership
• Non-financial contributions, such as unpaid labour on the property or within the household

The Difference Between Owning the Home and Owing the Mortgage

Being named on a mortgage is a separate legal relationship — with the lender — from being named on title, which is ownership. You can be on one without the other, and neither automatically follows from the other. A partner who has been paying the mortgage without being on either document is in a genuinely uncertain position, which is exactly why this is worth resolving early rather than assuming.

Protecting Your Contribution Going Forward

• [ ] Get any agreement about ownership or contribution in writing before you start paying
• [ ] Consider a cohabitation agreement that addresses the home specifically
• [ ] Ask directly about being added to title if that reflects the actual intention
• [ ] Keep records of what you paid and when
• [ ] Get legal advice early — trust and unjust enrichment claims are fact-heavy and become harder to prove years after the fact

Frequently asked questions