What is the date of separation, and why does it matter?
Your date of separation is the day your relationship ended with no reasonable prospect of getting back together. It fixes the values used to divide property, starts the clock for divorce and property claims, and marks when support obligations usually begin. Often it is obvious. When it is not, a court decides it from how you actually lived.
Key points
-
For married spouses, the separation date is usually the valuation date for net family property. A few months either way can change the equalization payment by thousands of dollars.
-
It sets the length of the relationship used in the spousal support guidelines, and it is the usual starting point for child and spousal support.
-
You can be separated while living under the same roof. One spouse can decide to separate without the other's agreement.
-
Disputes arise with short reconciliations, on-and-off relationships and shared homes. Courts look at conduct, not just what either of you says.
-
Write the date down and act consistently with it: tell your spouse in writing, update your status with the CRA, and separate your finances.
Not sure where your situation fits? Book a free 15-minute call about your separation date.
What does the date of separation decide?
The same date affects several parts of your case:
-
Net family property. For married spouses, assets and debts are valued on this date, called the valuation date.
-
The deadline for a property claim. A claim for equalization must generally be started within six years after separation, or two years after a divorce if that comes first.
-
Divorce. You need one year of living separate and apart before a divorce can be granted (Divorce Act, s. 8).
-
The amount and length of spousal support. The spousal support guidelines count the relationship from moving in together to separation.
-
When support starts. Separation is the usual starting point for child and spousal support claims. The case law is discussed below.
-
Common-law status. Separation ends the period of living together that makes unmarried partners "spouses" for support.
-
Taxes and benefits. The CRA treats you as separated from the day you began living apart, once that has lasted 90 days (CRA).
How does the separation date affect property division?
For married spouses, the Family Law Act sets the valuation date as the date the spouses separate with no reasonable prospect of resuming cohabitation. Each spouse's net family property is what they own on that date, minus their debts. With some exceptions, they also deduct the value of what they brought into the marriage. The spouse with the higher figure pays the other half the difference. See Property division in Ontario.
The date matters most for assets whose value changes quickly. Examples are investment accounts, stock options and restricted share units, a business, real estate, or a bonus earned around that time. Growth after the valuation date generally belongs to the owner and is not shared.
Hypothetical example. Ana says she and Ben separated on January 15, 2024. Ben says it was September 30, 2024. Between those dates, Ana's investment account grew by $90,000 and Ben's RRSP grew by $10,000. Everything else stayed the same.
-
If they separated in January, Ana's net family property is $400,000 and Ben's is $150,000. The difference is $250,000, so Ana pays Ben $125,000.
-
If they separated in September, Ana's net family property is $490,000 and Ben's is $160,000. The difference is $330,000, so Ana pays Ben $165,000.
-
The eight months between the two dates are worth $40,000 to Ben. That is why the date is often the first thing spouses argue about. It is also why courts sometimes decide it as a separate issue before anything else.
How does the separation date affect child and spousal support?
Child support. A parent's duty to support a child does not wait for a court order. From the day you separate, the parent the child does not mainly live with is generally expected to pay child support. See Child support in Ontario.
If nothing was paid, a court can order support back in time. Under D.B.S. v. S.R.G., 2006 SCC 37, the usual starting point is the date the paying parent was told support was being sought. It is generally no more than three years before formal notice, unless the payer behaved badly, for example by hiding income. The Supreme Court applied the same approach to changing existing orders in Colucci v. Colucci, 2021 SCC 24. A clear separation date, and a clear written request for support soon after it, protect the child's claim.
Spousal support. The separation date matters in two ways:
-
Amount and duration. The Spousal Support Advisory Guidelines measure the relationship from the start of living together to separation, not to divorce. A longer relationship gives a higher range and a longer duration. Support can have no end date after 20 years together. The same applies under the "rule of 65": the recipient's age at separation plus your years together is 65 or more. A few months either way can cross one of those lines.
-
Start date. Support is usually claimed from separation. Courts can award it retroactively, but they consider when the recipient first asked for it and why they waited (Kerr v. Baranow, 2011 SCC 10). Delay weakens a claim.
If you separated and reconciled before the final separation, the guidelines usually add together the periods you lived together.
When is the date of separation clear?
Most separations have a date both spouses can point to. These are the usual ones.
You discussed it and agreed. You talked about ending the relationship and agreed on a date, ideally in writing. That can be an email, a text you both answered, or a recital in a separation agreement. A date both spouses confirmed at the time, and then lived by, is rarely disturbed later.
In Kassabian v. Marcarian, 2025 ONCA 239, the wife told her husband she was separating. She confirmed the date by email three weeks later, and he did not dispute it in his reply. The court accepted her date.
One spouse moved out and never came back. The day one of you left the home with no plan to return is usually the separation date. That is especially so once a new lease, a change of address or separate bank accounts follow. The move must reflect the end of the relationship. Living apart for work, study, immigration or caring for a relative is not separation, unless one of you also intended the relationship to be over.
One spouse was arrested and ordered to stay away. A spouse may be released on conditions not to contact the other or not to return home. The couple stops living together that day. If neither tries to resume the relationship, that day is usually the separation date. The condition is imposed by the criminal court, not chosen by the spouses. So if the relationship was not otherwise over, a court may look at what each spouse intended. A separation that follows violence or an arrest also raises safety and parenting issues. See Parenting after separation in Ontario.
If you are in danger, call 911. The Assaulted Women's Helpline offers free, confidential support 24 hours a day at 1-866-863-0511, or 416-863-0511 in the GTA, or #SAFE (#7233) on a mobile phone (Government of Ontario).
When is the date of separation hard to establish?
On-and-off relationships. Some couples break up and get back together several times. There may be several possible dates, and each spouse may prefer a different one. The question is when the relationship ended with no reasonable prospect of resuming. Hoping to get back together, or vague talk about it, is not enough to keep a relationship alive. What counts is whether you actually lived as a couple again.
Separating, reconciling and separating again. The law treats short reconciliations differently depending on the purpose:
-
For divorce, you can live together again for up to 90 days in total, mainly to try to reconcile, without restarting the one-year period (Divorce Act, s. 8).
-
For property, a genuine reconciliation generally means the first separation was not the valuation date, because you did resume living together. The valuation date is then the final separation. A brief, failed attempt may be treated differently, depending on how you lived during it.
-
For taxes, the CRA does not treat a separation of less than 90 days as a separation.
Separated living under the same roof. Many couples keep living in the same home after the relationship ends, often to save money or keep the children's routine. You can be separated while sharing a home, but you need to show the relationship actually ended. Ontario courts look at factors first set out in Oswell v. Oswell (1990), 74 O.R. (2d) 15 (H.C.J.). Later cases such as Greaves v. Greaves, 2004 CanLII 25489 (ON SC) apply them. The factors include:
-
separate bedrooms and a separate life inside the home;
-
no sexual relationship, although this alone does not decide it;
-
whether you still shared meals, chores, holidays and social events;
-
how you presented yourselves to family, friends and others;
-
whether you kept discussing family matters as a couple;
-
how you filed your tax returns and handled money; and
-
what either of you said about ending the relationship, and whether you acted on it.
No single factor decides it. In Kassabian, the husband said the marriage ended when the couple stopped sharing a bedroom in 2014. The court disagreed. For seven more years they filed taxes as married, travelled with their children, ate meals together and took no steps to divide property. The separation date was set in 2021, when the wife clearly told him the marriage was over.
How do courts decide a disputed separation date?
The court asks when at least one spouse intended to end the relationship and acted on it, so that there was no reasonable prospect of resuming it. You do not need your spouse's agreement. One spouse can decide to separate, as long as the decision is clear and shows in what they do.
Courts give more weight to conduct than to statements made later. They look at the relationship you actually had, not an ideal marriage. Where the date makes a large difference in money, a judge may decide it first, as a separate issue, before dealing with property and support.
What should I do to make my separation date clear?
-
Tell your spouse in writing that the relationship is over, and keep a copy.
-
If you agree on a date, confirm it in writing and put it in your separation agreement. See Separation agreements in Ontario.
-
If you stay in the same home, keep separate bedrooms and finances, and stop presenting yourselves as a couple.
-
Update your marital status with the CRA, using the day you began living apart.
-
Get statements for bank, investment, pension and debt accounts as of the separation date. You will need them for financial disclosure.
-
Write down why the date is what it is while you remember: who said what, who moved out, what changed.
-
Do not wait. The six-year limit for an equalization claim runs from separation, and delay weakens support claims.
Talk to a family lawyer about your separation date
Start with a free 15-minute call to talk through your situation and the next step. If the date is disputed, or a lot of money turns on it, we can gather the evidence and negotiate or argue the date. Once it is settled, we can record it in a separation agreement.
-
A free 15-minute phone call to talk through your situation and the next step
-
Separation Agreement from $1,499 plus HST; Independent Legal Advice $699 plus HST; other work at $275 an hour or under a limited-scope retainer
-
Later meetings by phone, by video or in person at 5200 Yonge Street, Suite 200, North York
-
Urgent or out-of-hours: leave a voicemail or send a text to 416-858-1320. If you are in danger, call 911
-
Legal Aid Ontario certificates accepted
Book a free 15-minute call about your divorce · Call 416-858-1320
__________________________________________________
Last reviewed: November 1, 2026
This page is general information about Ontario and federal law, not legal advice. Reading it or contacting us does not create a lawyer-client relationship. Laws and court fees change; check the date above.