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Financial Disclosure Before Signing a Separation Agreement in Ontario

Think your spouse is hiding assets? Learn what financial disclosure means in Ontario and when a court may set aside a separation agreement.

Family Law5 min readTSLBy the Treadstone Law Team · OntarioUpdated November 1, 2026
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Key takeaways
  • A court may set aside a separation agreement, or part of it, if a party failed to disclose significant assets, debts or other liabilities that existed when it was made.
  • Even when a ground is shown, the court still decides whether to use its discretion, and fairness is a relevant consideration.
  • Financial disclosure is a paramount consideration, and the spouse who holds the assets is responsible for disclosing and valuing them.

If you are about to sign a separation agreement and you suspect your spouse has not shown you everything, you are right to slow down. The numbers in an agreement are only as good as the information behind them, and agreements are hard to undo once signed.

This article explains what financial disclosure means in Ontario, who is expected to provide it, what can happen if it was incomplete, and what you can do before you sign. It is general information, not advice on your situation.

What financial disclosure means

In Ontario family court, financial disclosure means giving the other party and the court information and documents about your income, expenses, assets and debts. In court, Form 13 (Financial Statement (Support Claims)) is used for support-only cases, and Form 13.1 (Financial Statement (Property and Support Claims)) is used where property or debts are in issue.

Some court cases do not need a Financial Statement, such as certain child support cases where only the table amount is claimed. If you are negotiating privately, no court is asking for those forms, but the same categories make a sensible checklist.

Who has to disclose, and why it matters

The Court of Appeal for Ontario has said financial disclosure is a paramount consideration under Ontario's regime, and that the spouse who holds the assets is responsible for disclosing and valuing them. In practice, that means you should not have to prove what your spouse owns before they show you.

For married spouses, the figures drive the property division. Each spouse adds up what they owned on the separation date, minus debts and excluded property, and subtracts what they owned on the date of marriage; the spouse with the larger net family property pays the other an equalization payment. Excluded property can include inheritances, gifts from someone other than a spouse and personal injury damages. The matrimonial home is treated differently, because spouses share its full value even if one owned it before the marriage.

Pensions deserve special attention. Ontario guidance says to ask the pension administrator for information about a pension's value. Unmarried couples are not covered by equalization, and a partner who contributed to property the other owns may have a claim that is settled in the separation agreement.

When incomplete disclosure can undo an agreement

A court may set aside a domestic contract, or a provision in it, where a party failed to disclose significant assets, or significant debts or other liabilities, that existed when the contract was made. The other grounds are that a party did not understand the nature or consequences of the contract, or any other reason under the law of contract.

The Court of Appeal for Ontario uses a two-stage test. First, one of those circumstances must be engaged. That alone is not enough, because the court then decides whether to use its discretion to set the agreement or a provision aside, and fairness is relevant at that stage. Ontario guidance also warns that it can be difficult to get a court to set aside a separation agreement.

Some terms get extra scrutiny. A court may disregard a child support provision that is unreasonable under the child support guidelines, and may set aside a spousal support waiver that results in unconscionable circumstances. On the other hand, a spousal support waiver was upheld in one Court of Appeal case where there was no finding that the parties failed to understand or intend it.

Steps to take before you sign

Ontario guidance says you do not need a lawyer to make a separation agreement, but legal advice before signing is a good idea because it can be difficult to get a court to set an agreement aside. Each spouse should have their own lawyer review it, since an agreement cannot easily be changed later.

What to do next

If disclosure is still missing, do not sign to avoid conflict. Raise the gaps in writing and keep copies. If you have already signed, speak to a lawyer promptly about whether any ground applies.

Time limits matter. An equalization claim must generally be made within six years from the day of separation, or two years from the day the divorce is final, whichever comes first. The court keeps a residual discretion to extend time limits under the Family Law Act. A lawyer can tell you how these rules apply to your dates.

Frequently asked questions

Do I have to use Form 13.1 in a private negotiation?

The forms are court forms: Form 13.1 is used where property or debts are in issue, and Form 13 for support-only cases. In a private negotiation you are not before a court, but the same categories of information are a useful guide. A lawyer can tell you what to ask for.

Can I cancel the agreement if I find a hidden asset later?

A court may set aside an agreement or a provision where a party failed to disclose significant assets or debts that existed when it was made. The court then decides whether it is appropriate to do so, and fairness is relevant. It can be difficult, so get legal advice early.

What if I did not understand what I signed?

Not understanding the nature or consequences of the contract is a separate ground for a court to set it aside. Ontario guidance says each person should understand the terms and not be pressured to sign.

Does disclosure matter if we were never married?

Yes. Equalization does not apply to unmarried couples, but a partner who contributed to property the other owns may have a claim, and the separation agreement is where those claims are settled. You still need accurate information to settle them.

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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