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Do Increases in Value After Separation Count in Equalization in Ontario?

Find out how Ontario equalization treats growth in a home, business or investment after the valuation date, and what to do while your claim is unresolved.

Family Law4 min readTSLBy the Treadstone Law Team · OntarioUpdated November 6, 2026
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Key takeaways
  • Equalization values property as of close of business on the valuation date, which is usually the date of separation.
  • Equalization is a payment of money, and net family property is based on the value of property on the valuation date.
  • Time limits and protective court orders matter if you are worried about what happens to property while the claim is open.

After a separation, a house can rise in value, a business can grow and an investment account can swing either way. Many people ask whether that later change is shared.

The Ontario calculation is anchored to a specific date, and understanding that date is the key. The details for a business or investment can depend on the facts, so a lawyer or accountant can help you check your own situation.

The valuation date anchors the calculation

Net family property is the value of property a spouse owns on the valuation date, less excluded property, debts and date-of-marriage property. Values are calculated as of close of business on the valuation date or the date of marriage.

The valuation date is the earliest of these: separation with no reasonable prospect of resuming cohabitation; the date a divorce is granted; the date the marriage is declared a nullity; the date a spouse starts an improvident-depletion application that is later granted; or the day before a spouse dies.

Because each asset is measured on that date, growth or loss that happens afterwards is generally not part of the calculation. The result then is one-half the difference between the two net family properties, paid as money.

Different assets, same date

AssetWhat counts
HomeIts value and the mortgage on the valuation date; a matrimonial home is included in full, even if owned before marriage.
Business or investmentsValue on the valuation date; property is defined broadly, including contingent interests.
PensionImputed value of the interest from the date of marriage to the valuation date.
DebtsDebts and liabilities on the valuation date are deducted.

How a business, stock options or crypto-assets are valued, including how to treat tax and unvested interests, varies by case and often needs professional evidence. Using the valuation date means the question is usually what the asset was worth then, not what it is worth now.

Why the date can still be disputed

Spouses do not always agree on when they separated. The valuation date depends on separation with no reasonable prospect of resuming cohabitation, so the date itself can be argued, and a different date can mean a different value. Records such as statements closest to that date are useful, and in court the statement issued closest to the valuation date for each financial account must be provided in a Part I property claim.

If documents you served turn out to be incorrect, you must correct or update them. The party claiming a deduction or exclusion has to prove it.

Protecting property while the claim is open

Because equalization is a money payment based on a past date, some people worry the other spouse will spend or move assets in the meantime. The court can make preservation orders in an equalization application, such as restraining dealings with property or requiring security. It can also restrain the depletion of a spouse's property that would impair or defeat a claim.

On a payment order, the court can order security, including a charge on property, and can order instalments or delay of payment for up to ten years if needed to avoid hardship. Where spouses are still living together, a spouse may apply to have net family properties equalized as if separated if there is serious danger of improvident depletion.

What to do next

Frequently asked questions

If our house goes up in value after we separate, do we share the gain?

The home is valued as of close of business on the valuation date. A matrimonial home is included in full at that value, and the mortgage on that date is deducted. Later changes are generally outside the calculation.

Which date is the valuation date?

It is the earliest of separation with no reasonable prospect of resuming cohabitation, the date a divorce is granted, the date of a nullity declaration, the start of a later-granted improvident-depletion application, or the day before a spouse dies.

Can my spouse sell assets after we separate?

A court can restrain dealings with property or the depletion of property that would defeat a claim, and can require security. Whether an order is appropriate depends on the facts, so get advice.

Does waiting hurt my claim?

It can. An equalization application cannot be brought after the earliest of two years after divorce, six years after separation, or six months after the first spouse's death. A court may extend a time limit only in limited circumstances.

Sources

Links go to official government, court and regulator pages. The law changes — confirm you are reading the current version.

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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