A marriage contract does not say you expect the marriage to fail. It says you would rather decide these questions now, calmly, than later in the worst circumstances of your life.
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A marriage contract is a domestic contract under the Family Law Act. Signed before marriage it is commonly called a prenuptial agreement; signed during the marriage, a postnuptial one. The legal framework is the same.
It can address how property is divided, how the equalization of net family property is calculated or excluded, whether spousal support is payable, and how specific assets — a business, an inheritance, a property owned before the marriage — are treated.
There are firm limits. It cannot decide decision-making responsibility or parenting time for children not yet born in a way that binds a court, because those are always measured against the child's best interests. And the Family Law Act does not permit a marriage contract to limit a spouse's right of possession of the matrimonial home.
Marriage contracts are challenged more often than they fail, and the challenges follow a pattern: no disclosure, no independent legal advice, or signing under pressure days before the wedding.
Full financial disclosure is the foundation. A contract signed without each party knowing what the other actually has is the easiest kind to attack.
Timing matters too. An agreement produced a week before the ceremony invites the argument that there was no real opportunity to consider it or to get advice.
Marriage contracts do their most useful work in second marriages, where each spouse may want to protect what their children will inherit while still providing for the new spouse.
That intention has to be coordinated with the wills. Since 1 January 2022 marriage no longer revokes an existing will in Ontario, but a surviving spouse still has rights against an estate — including the ability to elect an equalization entitlement under the Family Law Act within six months of death — and a contract and a will that pull in different directions produce exactly the fight everyone was trying to avoid.
A properly made marriage contract is enforceable. The common grounds of attack are non-disclosure, absence of independent legal advice, and signing under pressure.
It cannot bind a court on decision-making responsibility or parenting time. Those are always decided on the child's best interests at the time.
Yes. A postnuptial agreement is governed by the same framework.
Well before the wedding. Signing days before invites an argument that there was no genuine opportunity to consider it or take advice.
No. They are separate documents that need to be consistent with each other, particularly in second marriages.
Government sources for this topic. Rules change — confirm the current position before you rely on it.
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