- The married-spouse rule Ontario's Family Law Act (as of writing — verify current rules) creates a process called equalization of net family property for married spouses.
- When a common-law relationship ends, Ontario courts apply what practitioners sometimes call the title rule: property belongs to the person who holds legal title to it.
- Consider a common scenario: one partner earns more and holds title to the home.
If you have been living with a partner for years — sharing a home, building a life, combining finances — it is natural to assume that the law treats your relationship like a marriage. In many ways Ontario law does extend rights to common-law partners: support obligations, for example, can apply after a period of cohabitation. But when it comes to common-law property rights in Ontario, there is a sharp, often shocking difference. Common-law couples have no automatic right to property equalization. When you separate, property goes back to whoever holds title — full stop.
Understanding this gap before a crisis hits can save you from serious financial harm. It can also help you see why a cohabitation agreement is one of the most protective documents a couple can sign — and why it is never too late to get one.
What Is Property Equalization — and Why Does It Not Apply to You?
The married-spouse rule
Ontario's Family Law Act (as of writing — verify current rules) creates a process called equalization of net family property for married spouses. In plain terms: when a marriage ends, each spouse calculates the value they accumulated during the marriage, and the spouse who came out ahead pays the other half the difference. It is a levelling mechanism built on the idea that marriage is an economic partnership, and that both spouses deserve a fair share of what was built together.
Equalization does not care whose name is on the deed or whose paycheque funded the investment account. It looks at the overall picture and rebalances it.
Common-law couples are outside that framework entirely
The equalization provisions of the Family Law Act apply only to married spouses. Common-law partners — regardless of how long they have lived together, whether they have children together, or how intertwined their finances are — are not entitled to an equalization payment when they separate. Ontario law simply does not extend that protection to them.
This is not an oversight or an administrative gap waiting to be filled. It is the current state of the law, and it has real consequences for people who do not know about it until it is too late.
Title Rules: Property Goes to Whoever Owns It
When a common-law relationship ends, Ontario courts apply what practitioners sometimes call the title rule: property belongs to the person who holds legal title to it.
What that looks like in practice:
- The family home. If the house is in one partner's name only, it belongs to that partner on separation. The other partner has no automatic claim to any portion of the equity — even if they lived there for a decade, contributed to the mortgage, or paid for renovations.
- Savings and investments. Each person keeps the accounts registered in their own name. There is no automatic split of RRSPs, TFSAs, or non-registered investment accounts held by one partner.
- A family business. If one partner built or grew a business during the relationship, the other has no automatic share of that value simply because they were together.
The title rule is straightforward to apply. It is also, in many situations, profoundly unfair.
When Title Rules Produce Unfair Outcomes
Consider a common scenario: one partner earns more and holds title to the home. The other partner earns less, covers household expenses, raises children, and contributes in countless ways that allowed the titled partner to grow wealth. On separation, the titled partner keeps the house and the equity. The other partner walks away with whatever was registered in their own name.
Or imagine a couple who jointly funds a down payment from shared savings, but put the mortgage and title in one name for administrative simplicity. On separation, the person whose name is not on the title has no legal entitlement to the equity — even if their money built it.
When the courts can step in — but it is not guaranteed
There are legal doctrines — unjust enrichment and constructive trust — that courts have used to award a common-law partner a share of property they contributed to but do not hold title to. These claims can succeed, but they:
- Require litigation, which is costly and stressful
- Depend on proving a meaningful contribution and an unjust result
- Are not guaranteed — outcomes vary based on the specific facts
- Cannot reproduce the predictability of the equalization framework that married spouses receive automatically
In short: you can try to fix the unfairness after separation, but it is far better to address it before.
A Cohabitation Agreement Can Change Everything
A cohabitation agreement is a contract between common-law partners that sets out, in advance, how property will be handled if the relationship ends. It can:
- Define what each person brought into the relationship (keeping it separate)
- Specify how jointly acquired property — like a home purchased together — will be divided
- Create an equalization-style formula that mirrors what married spouses receive
- Address spousal support in the event of separation
A cohabitation agreement does not have to be adversarial. Most couples find that the process of having the conversation, with legal guidance, actually strengthens their relationship by making expectations clear and reducing future uncertainty.
If you later marry, a cohabitation agreement can be converted into a marriage contract — the legal framework transfers automatically.
Frequently asked questions
Does the length of my common-law relationship matter for property?
For property division, the duration of your relationship generally does not change the title rule. Property still belongs to whoever holds it, regardless of whether you lived together for two years or twenty. Duration can matter for spousal support claims, but not for dividing assets. As of writing — verify current rules on any cohabitation thresholds that may apply.
What if we bought the house together — does that help?
Yes. If both partners are on title, both partners own a share of the property and are entitled to that share on separation. The problem arises when only one name is on the title, which is more common than people realize. Always confirm how title is actually registered, not just how you think of ownership.
Can I make a claim on my partner's property if I contributed financially?
Possibly — through an unjust enrichment or constructive trust claim — but this requires going to court, proving your contribution, and accepting real uncertainty about the outcome. It is expensive, slow, and emotionally difficult. A cohabitation agreement is a far simpler and more reliable route.
Is it too late to sign a cohabitation agreement if we are already living together?
No. You can enter a cohabitation agreement at any point during a common-law relationship — before you move in, one month in, or ten years in. Independent legal advice for both partners strengthens the agreement and helps ensure it will hold up. The sooner you have the conversation, the more options you have.
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