Few couples enter marriage expecting it to end. However, if you sign a prenup and later get divorced, the agreement becomes the primary document governing how your assets, debts, and spousal support obligations are resolved, provided it meets the requirements of Ontario’s Family Law Act. such as full financial disclosure, voluntary consent, and Independent Legal Advice.
Ontario courts will generally enforce a properly drafted agreement, but retain limited discretion to set aside provisions that are unconscionable or that fail the statutory fairness test for spousal support.
A prenuptial agreement, known under Ontario law as a marriage contract, is a binding domestic contract signed before marriage under Part IV of the Family Law Act. It defines how property, debts, and spousal support will be handled if the marriage ends. To be enforceable, the agreement requires full financial disclosure, voluntary consent, and Independent Legal Advice for both parties.
For a complete overview of how prenuptial agreements work in Ontario, see our comprehensive guide to prenuptial agreements in Ontario.
Signing a prenuptial agreement creates a binding domestic contract under Part IV of the Family Law Act. From the moment both parties execute the agreement with their respective Certificates of Independent Legal Advice attached, it governs the financial framework of the marriage.
The agreement defines which property is excluded from the default equalization regime under Ontario law. Pre-marital assets, future inheritances, gifts from third parties, and identified business interests can all be designated as excluded property. As a result, those assets remain outside the Net Family Property calculation if the marriage ends.
A prenup can fix, limit, or waive spousal support entitlement, and Ontario courts will generally uphold these provisions. The leading authority, Miglin v. Miglin (2003 SCC 24), confirms that a properly executed spousal support waiver is enforceable unless the agreement was negotiated unfairly or its enforcement would be substantially at odds with the objectives of the Divorce Act at the time of application. Setting aside a waiver is the exception, not the rule. It is best to speak to a lawyer about this exception as it may not apply to your case.
The agreement allocates responsibility for pre-marital debts and can specify how debts incurred during the marriage will be treated at separation. This protects each party from inheriting financial liability they did not create.
Each party retains the right to manage, sell, transfer, or encumber their separately held property during the marriage without requiring the other’s consent — except in the case of the matrimonial home, which receives special statutory protection regardless of the agreement.
When a marriage ends, a properly executed prenuptial agreement becomes the controlling document for resolving financial matters between the spouses. Ontario courts apply the agreement as written, intervening only where a specific statutory or common-law ground for setting it aside is established.
As a result, separating spouses with a valid prenup typically avoid the most expensive driver of family litigation, disputed property division and contested spousal support claims.
The agreement is treated as a binding contract. The court reviews its terms, confirms compliance with the formal requirements of section 55 of the Family Law Act (in writing, signed by both parties, witnessed), and applies the agreed-upon division of property and spousal support obligations. In contested proceedings, the burden falls on the party seeking to set the agreement aside, not on the party seeking to enforce it.
Under Ontario’s default regime, separating spouses calculate Net Family Property and equalize the difference. A prenup overrides this default. Property identified as excluded in the agreement is removed from the equalization calculation entirely, and the resulting payment if any reflects only the assets the parties intended to share.
Certain matters fall outside the reach of a prenuptial agreement and cannot be contracted out of, regardless of what the parties signed:
A clearly drafted, properly executed prenup narrows the issues in a divorce to those the agreement does not address, typically child-related matters and any property acquired in joint names during the marriage. This is the practical purpose of the document: not to eliminate divorce proceedings, but to make them efficient, predictable, and far less expensive.
Yes, under specific circumstances defined by section 56(4) of the Family Law Act. The grounds, the leading cases, and the practical steps to ensure your agreement survives a challenge are addressed in detail in our pillar resource.
Read the full analysis in our Comprehensive Guide to Prenuptial Agreements in Ontario
A professionally drafted prenuptial agreement in Ontario costs significantly
less than the litigation it prevents. Contested divorce proceedings routinely
run between $10,000 and $90,000+ per spouse, while a properly drafted prenup
is a fraction of that figure.
At Shaikh Law Firm, we offer a transparent
flat-fee prenup agreement for $1,980 that includes drafting, financial statements,
and Independent Legal Advice. Click the link below to see our fees structre
We have been retained to serve clients across Ontario
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