Date of Separation for Common-Law Couples in Ontario

When a common-law relationship ends, one of the first arguments is often about when it actually ended. One person remembers the day someone moved out. The other points to months of sleeping in separate rooms before that. Both memories can feel true, and the gap between them can matter.

The date can affect spousal support, the tax and benefit amounts you receive, and how you describe your status to government. This article explains why the date matters, how different rules look at it, and what kind of evidence helps. It is general information, not advice on your situation.

Why the separation date matters

Unmarried couples do not have a single legal marker like a marriage certificate or a divorce order. Instead, the start and end of the relationship are decided by looking at how you lived. That is why the end date can be argued over.

• Spousal support: an unmarried person is a spouse for support claims under the Family Law Act if the couple cohabited continuously for not less than three years.
• Taxes: CRA treats a couple as common-law after 12 continuous months together, or sooner if they are parents of a child together.
• Benefits: your benefits and credits are recalculated on adjusted family net income starting the month after a change in marital status.
• Housing: under the Residential Tenancies Act, an unmarried partner may count as a spouse after at least one year of cohabitation, or in other listed situations.

Whether a time limit applies to your claim depends on the type of claim and your situation, so ask a lawyer to confirm before you assume you have time.

What 'living together' means

Under the Family Law Act, to cohabit means to live together in a conjugal relationship, whether within or outside marriage.

The Court of Appeal for Ontario has said cohabitation needs both a conjugal relationship and living together. It upheld a finding that there needs to be some element of living together under the same roof, but that lack of a shared residence is not determinative, and the factors are considered together.

In practice, this means a separation date is not just a moving-out date. When a court asks whether a couple cohabited, it considers the factors together rather than relying on a single one.

How different rules treat the date

The same couple can be treated differently by different rules. Do not assume that a date that works for one purpose works for all of them.

For tax purposes, CRA says a separation of less than 90 days caused by a relationship breakdown does not interrupt the 12-month period. Separations that are involuntary, such as for work, school, health or incarceration, do not count as a breakdown.

Taxes and benefits after separation

CRA says a change in marital status must be reported by the end of the month after the change. It also says a separation should not be reported until it has lasted at least 90 days, and the effective separation date is the day the couple started living apart.

If you are still separated after filing and have been for 90 days or more, CRA says to change your status to separated using the first day of separation as the date, and you may need to file an amended return.

After a change in marital status, benefits and credits are recalculated on adjusted family net income starting the month after the change, and if CRA finds an overpayment, it sends a notice with a remittance voucher. CRA may keep all or part of future Canada Child Benefit payments, income tax refunds or CGEB until an overpayment is repaid.

Where children are involved, CRA treats a child living with you 40% to 60% of the time as shared custody, and each parent generally gets 50% of the amount. Each parent must immediately tell CRA of a new custody situation.

A false statement or omission in a return made knowingly or with gross negligence can attract a penalty under section 163(2) of the Income Tax Act. An honest disagreement about a date is different from a knowing misstatement, but it is worth getting advice from a lawyer or accountant before you pick a date to report.

How to prove your date and what to do next

Start collecting records while they are easy to find.

• Write a short timeline: the day you stopped being a couple, the day someone moved out, and any later contact.
• Save texts or emails where either of you says the relationship is over.
• Keep a lease, bills or bank records showing who moved, and when addresses changed.
• Note the dates you changed your address with banks, employers, your health card and CRA.
• Keep your tax returns and benefit notices showing the status you reported.
• Ask friends or family who saw the change if they would be willing to confirm dates.

Be consistent. The date you give CRA, your landlord and a court should be one you can explain. If you and your former partner cannot agree, a lawyer can explain which rule matters most for your goals, whether that is support, property or benefits. Property rights also differ for unmarried partners, because common law couples are not legally required to split property acquired while living together.

Frequently asked questions