Common-Law Separation Rights in Ontario: What You Need to Know

Common-Law Is Not the Same as Marriage in Ontario

Many couples in Ontario live together for years — sometimes decades — without getting married, assuming that the law treats them just like a married couple after a certain period. This is one of the most common and most damaging misconceptions in Canadian family law.

In Ontario, common-law partners have some — but not all — of the legal rights of married spouses. Knowing where the differences lie is essential, especially when a long relationship is ending.

When Are You Considered Common-Law in Ontario?

Ontario does not have a single definition of “common-law” — the rules vary depending on the legal issue. Generally:

• For spousal support: you must have cohabited continuously for at least 3 years, OR be in a relationship of some permanence with a child together
• For income tax: 12 months of cohabitation (or a child together) makes you common-law
• For property: there is no automatic property-sharing right regardless of how long you have lived together

The Big Difference: Property

This is the single most important distinction between marriage and common-law in Ontario. Married spouses are entitled to equalization of net family property, which divides the increase in wealth during the marriage equally. Common-law partners have no such automatic entitlement.

In Ontario, common-law partners keep what is in their own name. If your name is not on the deed to the house, you have no automatic right to a share of the home — no matter how long you lived there or how much you contributed financially or otherwise.

How Common-Law Partners Can Claim Property

This does not mean common-law partners are without options. Where property has been accumulated unfairly during a relationship, common-law partners can advance claims under principles of equity, including:

Unjust Enrichment: A claim that one partner has been unjustly enriched at the expense of the other. To succeed, the claimant must prove enrichment of the other partner, a corresponding deprivation, and the absence of a legal reason (“juristic reason”) for the enrichment.

Constructive Trust: A remedy that gives a partner an ownership interest in property based on their contributions, even if their name is not on title.

Resulting Trust: A doctrine that recognizes ownership rights based on financial contributions to the purchase of property.

Joint Family Venture: Recognized by the Supreme Court of Canada in Kerr v. Baranow, this doctrine allows for sharing of wealth accumulated through joint effort during a long relationship.

These claims are complex, fact-specific, and far harder to prove than the automatic entitlements available to married spouses. They typically require detailed evidence of contributions, intentions, and financial arrangements throughout the relationship.

Spousal Support for Common-Law Partners

Common-law partners CAN claim spousal support in Ontario, provided they meet the cohabitation requirements (3 years, or a child together with some permanence in the relationship). The amount and duration are determined using the same Spousal Support Advisory Guidelines that apply to married spouses.

Children: Same Rights as Married Parents

When it comes to children, common-law and married parents are treated identically. Both parents have the same rights to seek decision-making responsibility, parenting time, and child support, regardless of marital status.

Pensions and Common-Law Partners

Common-law partners may have rights to pension benefits depending on the specific pension plan. Some workplace pension plans recognize common-law partners as beneficiaries; some do not. The Canada Pension Plan and the Quebec Pension Plan have specific rules for common-law partners.

How to Protect Yourself in a Common-Law Relationship

If you are in or considering a common-law relationship, the most powerful way to protect yourself is a cohabitation agreement. This contract sets out how property, debts, and support will be handled if the relationship ends. A cohabitation agreement is especially important if:

• You are moving into your partner’s home or vice versa
• One partner has significantly more assets or income
• One partner plans to reduce earning capacity to raise children
• There are children from previous relationships
• A business or significant inheritance is involved

Why This Matters to You

After a long common-law relationship ends, partners are often shocked to learn that they have far fewer rights than they assumed. By the time the relationship is over, it is generally too late to negotiate a cohabitation agreement — but legal advice can still help you understand what claims may be available.

The Toronto family lawyers at Soica & Associates help common-law partners understand their rights, negotiate fair separations, and draft protective cohabitation agreements.

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.