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Common-Law Separation Agreements in Ontario Explained

Unmarried and splitting up in Ontario? See what a separation agreement can cover and how property rights differ from those of married spouses.

Family Law4 min readTSLBy the Treadstone Law Team · OntarioUpdated November 13, 2026
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Key takeaways
  • Unmarried couples can make a separation agreement under the Family Law Act just as married couples can.
  • Ontario's equalization regime does not apply to unmarried couples, so property claims are often settled in the agreement.
  • Support, children, pensions and inheritance rights can all work differently for common-law partners, so the details are worth confirming with a lawyer.

Living together without marrying does not leave you without options when the relationship ends. It does mean the rules for dividing property are different from those that apply to married spouses.

This article explains what a separation agreement can cover for common-law partners in Ontario, where the rules differ from marriage, and what to think about before you sign.

Yes, common-law partners can sign one

Two people who lived together and are now living separate and apart may make an agreement setting out their rights and obligations. This applies to married and unmarried couples alike. Separation needs no court order and applies to married and common-law couples.

The agreement is a domestic contract, so it must be in writing, signed by the parties and witnessed to be enforceable.

How property differs from married spouses

Married spouses use equalization of net family property, where the spouse with the larger net family property pays the other an equalization payment. Ontario's equalization regime does not apply to unmarried couples. Common-law couples are not legally required to split property acquired while living together, and household items and other property belong to the person who bought them.

There is an important qualification. A partner who contributed to property the other partner owns may have a right to part of it. Unless the owner agrees to repay, the contributing partner may have to go to court to get the contribution back. The separation agreement is where these claims are settled.

IssueMarried spousesCommon-law partners
Property divisionEqualization of net family propertyNo equalization; property generally belongs to the person who bought it
Family homeFull value shared, divided equally unless the spouses agree otherwiseContribution claims may be settled in the agreement
Inheriting with no willEntitlement may exist, but not for a separated spouseNo inheritance under the Succession Law Reform Act

What the agreement can cover

Child-related terms are not fixed by your agreement alone. A court may disregard a parenting provision if doing so is in the child's best interests, and may disregard an unreasonable child support provision.

Pensions and the Canada Pension Plan

Canada Pension Plan contributions made while partners lived together can be split after separation from a common-law relationship. Common-law partners generally must apply for a split within 48 months of starting to live apart, while divorced spouses and separated married spouses have no deadline unless the spouse dies. A private agreement generally cannot stop a split, because Ontario is not among the provinces with listed exceptions.

For workplace pensions, ask the pension administrator for information about the value of a pension. How a pension applies to your situation is worth confirming with a lawyer.

What to do next

If you want the Family Responsibility Office to enforce the support terms, the agreement must first be filed with the Ontario Court of Justice or the Family Court of the Superior Court of Justice, and then registered with the Family Responsibility Office. The Family Responsibility Office enforces only the support terms, and a recipient can instead choose not to use it and go to court to enforce the separation agreement directly.

Frequently asked questions

Do common-law partners split property equally in Ontario?

Not automatically. Ontario's equalization regime does not apply to unmarried couples, and common-law couples are not legally required to split property acquired while living together. A partner who contributed to property the other owns may have a claim.

Can a common-law partner claim spousal support?

Possibly. Support is not automatic, but a person may be entitled if they lived together as a couple for at least three years, or were in a relationship of some permanence and had a child together.

Will my common-law partner inherit if there is no will?

Ontario guidance says a common-law spouse does not inherit under the Succession Law Reform Act when there is no will. A person who depended on the deceased for support can claim against the estate.

Is there a deadline to split Canada Pension Plan credits?

Common-law partners generally must apply within 48 months of starting to live apart. Either person can apply, online or on form ISP1901.

This article is general information, not legal advice. Reading it does not create a lawyer-client relationship. Ontario laws, tax rates, and government programs change, and how the law applies depends on your specific facts. For advice about your situation, speak with a licensed Ontario lawyer. Treadstone Law is licensed by the Law Society of Ontario — reach us at 1-844-900-1070 or start a file online.

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