Common-Law Spousal Support in Ontario: Who Qualifies and How It Works

Many people are surprised to learn that you do not have to be married to claim — or to owe — spousal support in Ontario. If you and your partner lived together in a conjugal relationship long enough, or had a child together, common-law spousal support may be on the table when the relationship ends. Understanding whether you qualify, and what the law actually requires, is the first step to protecting your financial future.

This guide covers the eligibility rules for common-law partners under Ontario's Family Law Act, how those rules differ from the support obligations that apply to married spouses under the federal Divorce Act, and what factors a court considers when deciding entitlement and amount. If you are in the middle of a separation, the single most valuable thing you can do is get legal advice early — before you sign anything or let time slip by.

The Key Distinction: Common-Law vs. Married Spouses

Ontario has two separate legal frameworks for spousal support, and which one applies depends entirely on whether you were married.

Married spouses fall under the federal Divorce Act once a divorce proceeding is started. The Divorce Act applies across Canada and uses the word "spouse" to include only legally married partners.

Unmarried cohabiting partners must rely on Ontario's Family Law Act (FLA). The FLA extends spousal support rights to partners who meet a specific cohabitation threshold — but it does not give unmarried partners all the same rights as married spouses. Property division under the FLA, for example, works very differently: the equalization of net family property that married spouses access does not automatically apply to common-law partners.

For spousal support specifically, the FLA does give qualifying common-law partners the right to seek support from each other — but you must first clear the eligibility threshold.

The Cohabitation Threshold: Do You Qualify?

Under the Family Law Act, you are considered a "spouse" for the purpose of spousal support if you and your partner:

• Cohabited continuously for at least three years, or
• Cohabited in a relationship of some permanence and are the natural or adoptive parents of a child together (as of writing, this threshold is generally described as one year of cohabitation together with a child, though the precise statutory language controls — verify current wording).

Both tests require that you were living together in a conjugal relationship — not just roommates or occasional partners. Courts look at factors such as shared finances, public presentation as a couple, sexual intimacy, and mutual commitment when evaluating whether a relationship was truly conjugal.

If you do not meet either threshold, the FLA does not give you a right to spousal support, regardless of how long you were emotionally involved or how much you financially supported your partner. This is one of the starkest differences from marriage, where support rights attach from the date of the wedding.

Practical tip: If your cohabitation date is disputed, gather evidence now — lease agreements, joint bank account statements, utility bills, correspondence addressed to both of you at the same address, or statutory declarations from people who knew you as a couple.

How Entitlement Is Assessed

Meeting the threshold only opens the door. It does not mean support is automatic. A court (or a negotiating lawyer) will then consider three questions:

1. Is There Entitlement?

Entitlement means there is a legal basis for support in the first place. Ontario courts recognize three grounds:

• Compensatory: One partner sacrificed career advancement, education, or earning potential to support the relationship or care for children. Support compensates for that loss.
• Non-compensatory (needs-based): One partner simply cannot meet reasonable needs from their own income and the other has the means to help.
• Contractual: A cohabitation agreement set out support terms. Courts will enforce clear, voluntary agreements that were made with independent legal advice.

In practice, the longer the relationship and the greater the economic disparity between partners, the more likely a court is to find entitlement.

2. How Much?

There is no statutory formula for the amount of support the FLA requires, but lawyers and judges across Canada routinely refer to the Spousal Support Advisory Guidelines (SSAG) — a detailed framework developed by family law researchers. The SSAG takes into account the income of both parties, the length of cohabitation, and whether children are involved. Although the SSAG are not law, they are widely used and produce ranges rather than fixed numbers.

3. For How Long?

Duration is tied to the length of the relationship and the purpose of support. Shorter relationships typically produce time-limited support designed to help the lower-income partner retrain or re-enter the workforce. Longer relationships, or those involving significant career sacrifice, may produce indefinite support — especially where children are involved and the economic disparity is large.

Differences From Married-Spouse Support

While the underlying goals are similar, there are meaningful practical differences:

The limitation period risk is particularly important for common-law partners. If you separate and do not pursue support within the applicable window, you may lose your right to claim — even if you were clearly entitled. Do not wait.

Cohabitation Agreements: Planning Ahead

A cohabitation agreement — sometimes called a domestic contract — allows partners to define their financial rights and obligations before or during the relationship. You can use it to:

• Confirm or waive spousal support entitlement
• Set out how property will be divided on separation
• Establish what happens if one partner leaves the workforce to care for children

For a cohabitation agreement to be enforceable, both parties must enter it voluntarily, with full financial disclosure, and with independent legal advice. Courts have set aside agreements signed under pressure or without disclosure. Getting the agreement right at the start is far cheaper than litigating over it later.

Frequently asked questions