Financial Disclosure and the Validity of Your Agreement

Why Disclosure Can Make or Break Your Agreement

It is easy to assume that once a separation agreement is signed and witnessed, it is settled. In many cases that is true. But Ontario law treats a properly executed agreement and a properly disclosed agreement as two different things — and it is entirely possible to have the first without the second.

Incomplete or dishonest financial disclosure is one of the most commonly cited reasons a domestic contract, such as a separation agreement, later gets challenged in Ontario. That means disclosure is not a side issue or a formality to rush through before getting to the "real" terms — it is directly tied to whether the property division, support terms, and other provisions you negotiate will actually stand up years later.

The Legal Basis for Setting Aside an Agreement

Ontario's Family Law Act sets out the general rules that apply to domestic contracts, including separation agreements, marriage contracts, and cohabitation agreements. Among other things, it gives a court the power, on application, to set aside a domestic contract or a specific provision in it in certain defined circumstances.

This ground is commonly understood to be found in section 56 of the Family Law Act. In general terms, it addresses situations such as a party failing to disclose significant assets, debts, or other liabilities that existed when the contract was made, a party not understanding the nature or consequences of the contract, or other circumstances that would apply under the ordinary law of contract. Non-disclosure of significant financial information is a long-recognized and frequently litigated ground among these.

Two things about this are worth understanding clearly. First, a court "may" set aside an agreement where a ground is shown — it is a discretionary remedy, not an automatic result. Second, the person asking a court to set an agreement aside generally carries the burden of establishing the ground and persuading the court that setting it aside is appropriate in the circumstances. Because the exact reasoning can turn heavily on the specific facts, general legislation and case law summaries like this one are not a substitute for advice about your own situation.

What Counts as "Significant" Non-Disclosure

Not every incomplete detail puts an agreement at risk. Courts generally look at whether the non-disclosure was significant, rather than treating any omission — however small or honest — as grounds to unravel an agreement. In practice, this often involves weighing the value of what was not disclosed against the overall size of the parties' assets and the broader context of the relationship, rather than applying a fixed dollar figure or a strict formula.

This is necessarily a general, fact-driven assessment, and it can cut both ways. A missed asset that looks minor in isolation might still be considered significant if it represents a meaningful share of what a couple actually had; conversely, a small, genuinely inadvertent gap in an otherwise thorough disclosure is less likely, on its own, to unravel an agreement. The safest approach is never to rely on an omission being "probably too small to matter" — treat full and accurate disclosure as the goal from the outset, not as something to approximate.

Sworn Financial Statements

In a court proceeding, financial disclosure is generally formalized through a sworn financial statement — a Family Law Rules form in which a person sets out their income, expenses, assets, and debts under oath or affirmation, supported by documents. Because it is sworn, providing false or materially incomplete information in one is treated seriously.

A private separation agreement does not strictly require the same court form, since no court case may ever be started. Even so, many family law professionals recommend that spouses exchange a sworn or signed financial statement, or something modeled closely on one, before finalizing an agreement — precisely because it creates the same kind of clear, dated, and formal record of what was disclosed that a court case would require. Doing this before signing, rather than only if a dispute arises later, is generally considered good practice rather than an optional extra step.

What to Exchange Before Signing

Exactly what is relevant depends on each spouse's situation, but in general terms, couples preparing to sign a separation agreement are generally well served by exchanging:

• Recent income tax returns and Notices of Assessment
• Pay stubs or other current proof of income, including self-employment or business income
• Bank, investment, and retirement or pension account statements
• Mortgage statements and documents relating to the value of any real estate, including the matrimonial home
• Statements for significant debts, such as credit cards, lines of credit, and loans
• Business financial records, where either spouse owns or holds an interest in a business

This list describes common categories rather than an exhaustive checklist for every situation. For a broader look at the disclosure obligation itself, including how it works in a court case, see our separate discussion of financial disclosure in Ontario family law.

Keeping a Record of What Was Disclosed

Because a later challenge often turns on what each spouse actually knew at the time of signing, how you document disclosure matters almost as much as the disclosure itself. It is generally worth:

• Keeping dated copies of every document exchanged, not just a summary of the numbers
• Preparing a written list, or a certificate similar to those used in court cases, confirming what each spouse provided and when
• Attaching the financial disclosure, or a clear summary of it, as a schedule to the signed agreement itself
• Retaining the original signed agreement along with the disclosure record, rather than only the final terms

None of this guarantees an agreement can never be challenged, but a well-documented disclosure record can make it considerably easier to show, years later, exactly what information each spouse had when they signed.

Discovering Non-Disclosure After Signing

Sometimes non-disclosure only comes to light after an agreement has been signed — a spouse later learns of an account, a property, or a business interest that was never mentioned during negotiations. Discovering this does not automatically undo the agreement. It generally means there may be grounds to bring an application asking a court to set aside part or all of it, with the specific facts, including how significant the omission was, playing a central role in how that application is assessed.

For a fuller look at this process, including other general grounds beyond non-disclosure and what is generally involved in bringing a challenge, see Challenging a Separation Agreement.

Disclosure in Litigation vs. in an Agreement

Financial disclosure matters in every family law matter, but it plays a somewhat different role depending on whether spouses are in court or negotiating privately. In litigation, disclosure is a formal, ongoing procedural obligation, enforced directly by a judge through sworn statements, specific rules, and consequences for non-compliance while a case is underway.

In an agreement, disclosure is not primarily about satisfying an active court process — it is about protecting the validity of the document itself, since incomplete disclosure at the time of signing is what can expose an otherwise final agreement to a challenge long afterward. For a broader look at how the disclosure obligation works generally, including in a litigation context, see Financial Disclosure in Ontario Family Law. For the agreement itself and its other formal requirements, see Separation Agreements in Ontario.

Frequently Asked Questions