Common-Law vs. Married in Ontario: How Property Rights Actually Differ

• by Gagandeep Singh Arora
• June 06, 2026

Common-Law vs. Married in Ontario: How Property Rights Actually Differ

Introduction

A surprising number of Ontario couples who have lived together for years assume they have the same property rights as married couples. They don’t. Ontario family law treats common-law and married couples very differently when a relationship ends — particularly on property — and that gap can mean the difference between walking away with half of what was built together and walking away with nothing more than what’s already in your own name.

In Ontario, married spouses have a statutory right to equalization of Net Family Property under Part I of the Family Law Act, while common-law partners have no equivalent right, regardless of how long the relationship lasted. Common-law partners must instead rely on equitable remedies like the constructive trust to claim a share of property accumulated during the relationship.

This guide explains how property rights actually differ between common-law and married couples in Ontario in 2026 under the Family Law Act, what remedies common-law partners have when the statute doesn’t help, and where the two categories are treated the same — spousal support, child support, and CPP credits.

What “Married” and “Common-Law” Mean in Ontario Family Law

In Ontario, “spouse” is defined two different ways depending on which part of the Family Law Act applies, and this split is the source of most of the confusion couples run into.

For property division under Part I of the Act, only legally married spouses qualify. Married means married — a valid marriage under the federal Marriage (Prohibited Degrees) Act and provincial solemnization rules. A religious-only ceremony that was never registered as a legal marriage does not count for this purpose, even if the couple considers themselves married in every practical sense.

For spousal support under Part III of the Act, and for most other areas of family law, “spouse” includes married couples plus common-law partners who have either cohabited continuously for three years or who are in a relationship of some permanence and have a child together, whether by birth or adoption. Common-law partners can claim spousal support on the same footing as married spouses once they meet this three-year (or child) threshold — but they cannot claim equalization of property, which is the single largest financial right married spouses have on separation.

Equalization: The Right Married Spouses Have and Common-Law Partners Don’t

When married spouses separate in Ontario, each calculates their Net Family Property — the value of assets owned on the valuation date, usually the date of separation, minus debts on that date, minus net worth on the date of marriage, with certain exclusions for gifts, inheritances, and damages received during the marriage from third parties where those funds were kept separate. The spouse with the higher Net Family Property then pays the other spouse half the difference, known as an equalization payment.

The purpose of equalization is straightforward: it shares the economic growth of the marriage equally, regardless of whose name appears on the title. The spouse who stayed home and didn’t participate in the paid workforce, the spouse whose business grew substantially during the marriage, the spouse who inherited a house that later became the matrimonial home — equalization adjusts for all of it within a defined statutory framework. When business interests or retirement assets are involved, the calculation gets considerably more complex; our guide to how pensions, RRSPs, and business assets are divided in a Brampton divorce walks through how those specific asset types are valued and split.

Common-law partners get none of this. There is no statutory equalization for common-law partners in Ontario, regardless of how long the relationship lasted, how many children the couple had together, or how much one partner contributed to the other’s career or business over the years. The Supreme Court of Canada confirmed both this gap and its constitutionality in Quebec (Attorney General) v A, 2013 SCC 5, holding that provinces are entitled to draw the line for property equalization wherever they choose. Ontario has chosen to draw that line at marriage.

What Common-Law Partners Can Claim Instead: Trust Remedies

Common-law partners are not left with nothing, even without a statutory equalization right. When a common-law relationship ends and one partner is left with significantly less than they contributed toward, the courts have developed equitable remedies — chiefly the constructive trust, based on the joint family venture framework set out by the Supreme Court of Canada in Kerr v Baranow, 2011 SCC 10.

To establish a joint family venture, a claimant must show four factors: mutual effort, economic integration, actual intent to share, and priority of the family in the parties’ decisions. Where those factors are made out, and one partner has been unjustly enriched at the other’s expense, a court can order a share of the accumulated wealth proportional to the claimant’s contributions to the joint venture. The remedy is real, but it is not equalization — it is harder, slower, more expensive, and considerably less predictable to litigate than a straightforward married-couple calculation. Strong cases tend to involve long relationships with shared bank accounts, a shared business, jointly-raised children, or one partner subordinating their career to support the other’s, while marginal cases with less clear-cut integration often struggle to succeed.

A simpler remedy, the resulting trust, applies where one partner directly paid for something held in the other’s name and there’s no evidence the payment was intended as a gift. Resulting trust claims are narrower in scope than joint-family-venture constructive trusts, but they tend to be easier to prove on the right set of facts.

The Matrimonial Home: A Married-Only Protection

The matrimonial home — the home the spouses ordinarily occupied as the family residence on the date of separation — has special protections under Part II of the Family Law Act that apply only to married spouses. Both spouses have an equal right to possession of the matrimonial home regardless of which spouse actually owns it, and neither spouse can sell, mortgage, or otherwise encumber the matrimonial home without the other’s consent or a court order. On equalization, the value of the matrimonial home is fully included on the valuation-date side without any deduction for what the home was worth on the date of marriage, even if one spouse owned the property before the marriage began — a rule that surprises many spouses who assume pre-marriage equity is protected. Couples navigating this rule alongside a title change, such as adding a spouse to title in Ontario, should understand how the two issues interact before making any changes to ownership.

None of this applies to common-law partners. The home belongs to whoever’s name is on title, and the other partner can be required to leave on reasonable notice. There is no special “matrimonial home” protection for common-law couples anywhere in Ontario law. Our guide to the matrimonial home in Ontario covers these married-spouse protections in more detail.

Where Common-Law and Married Are Treated the Same

Several areas of family law treat the two categories identically, which is part of what makes the property gap so counterintuitive to couples encountering it for the first time. Spousal support applies the same legal test and the same factors under section 33 of the Family Law Act and the Spousal Support Advisory Guidelines, once the common-law qualifying period has been met. Child support is entirely about the child, so the parents’ marital status is irrelevant to the calculation. CPP credit splitting is available to common-law partners who have cohabited for at least one continuous year, and survivor benefits under CPP and many private pension plans extend to common-law partners on terms similar to married spouses.

Estate intestacy is where the gap catches couples off guard the most. Ontario’s Succession Law Reform Act does not treat a common-law partner the same as a spouse when someone dies without a will. If a common-law partner dies intestate, the surviving partner has no automatic entitlement under intestate succession — only a possible dependant support claim against the estate — while married spouses inherit a preferential share by default. A common-law partner without a will in place can be left with nothing more than a litigation claim against the estate, while children, parents, or siblings inherit ahead of them by default.

Cohabitation Agreements Close the Gap

Common-law partners who want the certainty of equalization-like rights — or who want to opt out of joint-family-venture exposure on the other side — can sign a cohabitation agreement under section 53 of the Family Law Act. A cohabitation agreement can spell out what happens to property, debts, support, and the home if the relationship ends. Properly drafted, signed, witnessed, and supported by full financial disclosure and independent legal advice on both sides, a cohabitation agreement is fully enforceable in Ontario.

For couples who later marry, a cohabitation agreement automatically becomes a marriage contract under section 53(2) of the Act, with no re-signing required, although a refresh of its terms is often a good idea once circumstances change. Our Family Law team regularly drafts and reviews cohabitation agreements for GTA couples who want this certainty built in before a relationship — not negotiated after it ends.

Frequently Asked Questions

Final Takeaway

The common-law versus married gap in Ontario matters most at two moments: when a relationship is being formed, through a cohabitation agreement, and when one is ending, through separation, support, trust claims, or an estate dispute. At either moment, knowing your real entitlements — and the other side’s — is the foundation for any sensible decision.

If you are in a common-law or marriage relationship in Brampton or anywhere in Ontario and want to understand your property rights, book a free consultation with GS Arora Law.

Disclaimer: The information provided in this blog is for general informational purposes only and should not be considered legal, tax, financial, or professional advice. Regulations and procedures may change over time and vary by jurisdiction. For guidance tailored to your specific situation, please consult a qualified professional.