Marriage Contract Canada | Family Law Act Section 52

A marriage contract is one of three recognized domestic contracts, alongside the cohabitation agreement and the separation agreement. It is signed by two people who are married or who intend to marry, and it governs their property and support rights during the marriage and on its breakdown or on death. In Ontario this is set out in section 52 of the Family Law Act; in British Columbia it falls under the Family Law Act, S.B.C. 2011, c. 25; in Alberta under the Family Property Act. The same instrument signed after the wedding is usually called a postnuptial agreement, but the legal test for enforceability is identical.

People often confuse the marriage contract with a cohabitation agreement, and the distinction is not cosmetic. A cohabitation agreement is for partners who live together without marrying. The moment those partners marry, the cohabitation agreement automatically converts into a marriage contract by operation of law unless the document says otherwise, and certain clauses change effect on that date. The most important practical difference is reach. Married spouses get a statutory property regime that common-law partners largely do not, so a contract written for a married couple does more heavy lifting than one written for cohabitants. Sign the document that matches your real legal status, because a contract built on the wrong assumption can collapse the first time it is tested. If you are not yet sure marriage is the plan, our cohabitation and common-law partner agreements for Canada sit in the same category and may be the better fit.

Marriage contracts in Canada live at the intersection of federal and provincial law, and the line between the two matters enormously. Divorce itself is federal, governed by the Divorce Act, and since the 2021 amendments that statute speaks of parenting time and decision-making responsibility rather than custody. Property division, by contrast, is provincial. That split has a hard consequence: a marriage contract can do a great deal with property and spousal support, but it cannot bind the things Parliament and the courts reserve for the child's benefit.

In Ontario, section 52 of the Family Law Act lets spouses contract out of the default equalization of net family property and tailor their own property and support terms. Three formal conditions decide validity under section 55: the agreement must be in writing, signed by both parties, and witnessed. Beyond form, section 56(4) lets a court set the contract aside where a party failed to disclose significant assets or debts, did not understand the nature or consequences of the deal, or where ordinary contract law (duress, undue influence, unconscionability) would void it. The Supreme Court of Canada in Miglin v. Miglin confirmed that properly negotiated domestic contracts deserve real deference, but that deference depends on honest disclosure and a fair process.

Two limits are absolute and worth stating plainly. A marriage contract cannot decide child support, parenting time, or decision-making responsibility; those remain open to the court under the child's best interests, and any clause attempting to lock them in is unenforceable. In Ontario, section 52(2) also makes any provision limiting a spouse's right to possession of the matrimonial home unenforceable, though the contract can still address division of the home's value. The federal Divorce Act and the Department of Justice family law overview is the authoritative starting point for the divorce-side rules that frame every agreement. For the property and support clauses themselves, your province's family property statute controls.

The clearest case is asset protection before a first or second marriage. If you own a home, hold investments, or are bringing a family business into the relationship, a marriage contract can keep that property out of the equalization or division pool and spell out exactly what your spouse can and cannot claim. Business partners and lenders increasingly ask to see one before extending credit, because an undefined spousal interest is a risk on their books too.

Blended families are the next common trigger. When one or both partners have children from a prior relationship, a marriage contract protects an inheritance intended for those children and coordinates with a will so the estate plan and the family law plan do not contradict each other. Remarriage after a divorce is a frequent driver here, since people who have been through one property fight rarely want a second.

Significant income or wealth imbalance is a third scenario. A contract can set out spousal support intentions in advance, define what a review looks like, and record the financial picture both parties relied on. It will not guarantee a support waiver survives, support waivers face the heaviest scrutiny of any clause, but a documented, disclosed bargain is far stronger than a handshake. One edge case worth flagging: a couple who already signed a separation or family arrangement before reconciling sometimes needs a fresh marriage contract to reset terms, and the old document should be formally revoked rather than left to create confusion.

• The identification of the parties and the matrimonial regime opens the contract, naming both partners, confirming their intention to marry, and (for Quebec) declaring whether they choose separation as to property or the partnership of acquests. In the common law provinces this section also states which province's law governs, which decides everything that follows.
• The financial disclosure schedule is the single most important attachment. Each party lists assets, debts, income, and significant property with values as of signing. Courts set agreements aside far more often for missing disclosure than for unfair terms, so this schedule is drafted as an exhibit each spouse initials, not a throwaway recital.
• The property division terms define what stays separate and what becomes shared. The template lets you exclude pre-marital property, gifts, and inheritances, and address how any increase in their value is treated, the issue that sank the agreement in N.K.D. v. H.S.D. in British Columbia when real estate values climbed unexpectedly.
• The spousal support provision records whether support is payable, waived, capped, or left to be determined, with the reasoning behind the choice. Because a bare waiver invites challenge, the clause is written to show the bargain was informed and mutual.
• The independent legal advice and execution block captures the witnessed signatures and, where the province expects it, certificates that each party had separate counsel. In Alberta this is not optional: section 38 of the Family Property Act requires each party to acknowledge the agreement separately and to obtain independent legal advice.
• The review and amendment clause sets out how the couple can update the contract as life changes, and confirms that child-related matters fall outside its scope. Pairing the contract with a current will and powers of attorney from our personal and family documents keeps the whole plan consistent.

Ontario treats the marriage contract as a domestic contract under section 51 of the Family Law Act, enforceable once it is written, signed, and witnessed under section 55. The province's distinguishing feature is the equalization of net family property: absent a contract, the spouse with the larger increase in net worth during the marriage pays half the difference. A marriage contract's whole purpose is often to opt out of that calculation. Remember that no Ontario contract can limit possession of the matrimonial home under section 52(2), and that section 56(4) makes independent legal advice close to essential for any clause touching family property.

British Columbia governs agreements under the Family Law Act, S.B.C. 2011, c. 25, where section 92 lets spouses divide, include, exclude, or value property differently than the default. The catch sits in section 93: a court can set the agreement aside for a procedural flaw such as failure to disclose, and even a procedurally clean agreement can fall under section 93(5) if it has become significantly unfair with the passage of time. BC's set-and-forget problem is real, so the template builds in review triggers.

Alberta applies the Family Property Act to married spouses and many adult interdependent partners. Its formalities are the strictest in the country: section 38 requires the agreement to be in writing, each party to acknowledge its nature and effect separately, and each party to receive genuinely independent legal advice before signing. An Alberta agreement signed without separate counsel is highly vulnerable.

Quebec stands apart entirely. A contrat de mariage must be executed by notarial act under the Civil Code of Québec, not merely witnessed, and it primarily fixes the matrimonial regime. Critically, article 391 and the family patrimony rules at articles 414 to 426 mean spouses cannot waive their rights in the family patrimony, the family residence, household furnishings, family vehicles, and pensions accumulated during the marriage are divided equally no matter what the contract says. A Quebec couple should consult a notary; this template is built for the common law provinces.

You begin by selecting the province where you will live as a married couple, because that single choice sets the governing statute, the formal signing rules, and which default property regime you are contracting out of. From there the form asks both partners to complete the financial disclosure schedule, listing assets, debts, and income, and it prompts you to attach supporting figures so the disclosure is concrete rather than a vague summary. You then choose how property is treated, whether pre-marital assets, gifts, and inheritances stay separate, and how any growth in their value is shared, and you record your spousal support intentions with space to explain the reasoning. The contract assembles the execution block with witnessed signature lines and, where your province expects it, certificates of independent legal advice. Once complete, you download the finished document in Word and PDF, sign it well before the wedding, and keep an original for each party. Building it months ahead, not days, is what keeps it standing if it is ever challenged.

The mistake that ends the most agreements is thin or absent financial disclosure. People treat the schedule as paperwork and leave assets off, then discover years later that the entire contract is voidable because the other spouse never knew what they were giving up. A close second is timing. An agreement pushed in front of a partner days, or hours, before the ceremony reeks of pressure, and courts have set such contracts aside on exactly that basis when one party felt they could not say no. Skipping independent legal advice is the third, and in Alberta it is fatal rather than merely risky.

Two errors are subtler. Couples write the contract once and never look at it again, so terms that made sense in year one become significantly unfair by year twenty, which is precisely how BC agreements collapse under section 93(5). And many people try to write child support or parenting terms into the contract, not realizing those clauses bind no one; the court keeps that jurisdiction for the children regardless. If support or property questions later arise outside marriage, our separation agreement and family law templates for Canada and the broader catalogue of Canadian legal documents cover those situations directly.