Common Law Separation Rights Ontario

In Ontario, common-law partners do not have the same automatic legal rights as married spouses when a relationship ends — and this distinction catches many people by surprise. Conversely, some common-law partners develop legal rights – although not automatic, they may have support and some property rights. Discovering the true state of your legal rights and obligations during a separation from a common law partner can have serious financial consequences if you are unprepared.

Whether you are seeking to understand your rights after a long-term relationship, protect assets you built together, resolve disputes about children, or enforce support obligations, the family lawyers at Soica & Associates provide clear, practical guidance on common law separation rights in Ontario.

What Is a Common-Law Relationship in Ontario?

There is no single universal definition of ‘common law’ in Ontario — the applicable threshold depends on which area of law governs the issue in question:

• Spousal support (Family Law Act). A couple is considered common-law spouses for support purposes if they have cohabited continuously for at least three years, or if they have cohabited in a relationship of some permanence and have a child together.
• Income tax (Canada Revenue Agency). Common-law partners are recognized after 12 continuous months of cohabitation, or immediately if they have a child together.
• Estate rights (Succession Law Reform Act). Common-law spouses who have cohabited continuously for at least three years may have rights to a deceased partner’s estate.
• Parenting rights (Divorce Act and Children’s Law Reform Act). Apply equally to parents regardless of whether they were married or in a common-law relationship.

Understanding which definition applies to your specific situation is the essential starting point for any legal advice on common-law separation. Our lawyers will identify which laws govern your circumstances and explain your rights and obligations clearly.

Common Law Property Rights: Who Gets What?

This is where common-law separation differs most significantly from separation and divorce for married couples. Unlike married spouses, common-law partners in Ontario are not entitled to Division of Property under the Family Law Act. When a common-law relationship ends, each partner generally keeps the assets that are legally registered in their own name.

This can produce deeply unfair outcomes — particularly where one partner sacrificed career advancement, contributed financially to assets held in the other’s name, or supported the household while the other built financial wealth. Ontario courts address this unfairness through several legal doctrines:

• Resulting trust. If you contributed financially to an asset held in your partner’s name — for example, by contributing to a down payment— you may have a legal interest in that asset proportionate to your contribution. The law presumes in this situation that a financial contribution to your spouse’s property was not intended as a gift.
• Constructive trust based on unjust enrichment. If your partner was enriched at your expense — through your unpaid labour, financial contributions, or sacrifices that benefited them — without a juridical reason for that enrichment, a court may impose a constructive trust and award you a share of the assets. This is the most significant remedy available to common-law partners and can apply to a wide range of contributions including homemaking, childcare, and business support.
• Express agreement. If you entered into a cohabitation agreement that addressed property division, that agreement governs — provided it meets the requirements for enforceability under Ontario law.

These claims are highly fact-specific. The strength of your claim depends heavily on the documentary evidence available — bank records, financial statements, contribution histories, and communications. If you are separating from a common-law partner, seeking legal advice early is critical. Evidence becomes harder to obtain over time.

Common Law Separation Rights Ontario: The House

Who gets the house when a common-law couple separates is one of the most practically important questions in Ontario family law. Unlike married spouses, common-law partners do not have an equal right to possess the home under the Family Law Act — the matrimonial home protections do not apply to common-law relationships. If the home is in one partner’s name alone, the other has no automatic right to remain in the home and can be asked to leave.

However, a partner who is not on title may still have a legal claim to a share of the value of the home through a resulting trust or unjust enrichment claim if they contributed financially to the home or its upkeep. These claims require evidence of contribution and legal proceedings to enforce. Cohabiting partners who are not on title should seek legal advice as soon as a separation begins.

Spousal Support for Common-Law Partners

Common-law partners who meet the threshold under the Family Law Act — cohabiting for at least three years, or less if they have a child together in a relationship of some permanence — may be entitled to spousal support on exactly the same legal basis as married spouses. The same three grounds of entitlement apply (compensatory, non-compensatory, and contractual), and the Spousal Support Advisory Guidelines (SSAG) are used to assess amount and duration — with the period of cohabitation substituting for the length of a marriage.

One important distinction: common-law spousal support entitlement arises under the Family Law Act, not the Divorce Act — there is no divorce proceeding and no corollary relief application. Support must be addressed through negotiation, a separation agreement, or an application to the court. See our Spousal Support page for a complete discussion.

Parenting and Child Support for Common-Law Parents

The rules governing parenting arrangements and child support are the same whether parents were married or common law. Both the Divorce Act (now applying to all parents with children, not just divorcing married couples) and Ontario’s Children’s Law Reform Act govern parenting disputes between common-law parents using the same best interests of the child standard. Both parents have equal legal standing and are entitled to apply for parenting time and decision-making responsibility.

Child support obligations under the Child Support Guidelines apply equally to common-law parents. Support follows the child, not the relationship status of the parents.

How to Protect Yourself as a Common-Law Partner

The most effective protection for common-law partners is a cohabitation agreement — a written contract entered into before or during the relationship that defines each partner’s property rights, support obligations, and financial arrangements. A cohabitation agreement automatically converts to a marriage contract if the parties later marry.

If you do not have a cohabitation agreement and your relationship has ended, the following steps are important:

• Seek legal advice immediately — limitation periods apply to property and support claims and begin running from the date of separation
• Document your financial contributions — gather bank records, payment histories, correspondence, and any other evidence of your contributions to jointly used assets
• Do not vacate jointly used property without legal advice — leaving the home can affect your rights and obligations, both financial and parenting
• Avoid disposing of or transferring assets in a way that could be characterized as dissipation pending any legal claim

Limitation Periods for Common-Law Claims

Limitation periods are critically important in common-law property and support claims. A claim for property based on unjust enrichment or trust must generally be commenced within ten years from the date the claimant knew or ought to have known of the claim — typically from the date of separation. Spousal support claims must be made as soon as possible, otherwise the court might hold this against the claiming spouse. Setting aside a provision in a Cohabitation Agreement should be made within two years from the date the claimant knew of ought to have known of the claim.  A limitation period may bar the claim entirely, regardless of its merits. This is one of the most important reasons to seek legal advice as soon as a common-law relationship ends.

Costs and Timelines

Negotiated common-law separation (support and/or property): 3‒8 months for straightforward matters.

Trust and unjust enrichment claims in court: 12 months to 3+ years depending on complexity.

Cohabitation agreement for existing relationships: Can typically be drafted and executed in 4–8 weeks.

Limitation periods: Claims must be commenced within the limitation periods.

→ Early legal advice is particularly critical for common-law separations, where rights are more limited and time-sensitive.