In Ontario, your marriage contract can dictate how property is divided and whether spousal support will be paid. However, it is strictly illegal to include clauses that pre-determine child support, dictate decision-making responsibility for children, or restrict a spouse’s right to live in the matrimonial home.
When drafting a marriage contract (prenup), many couples want to outline every single rule for their future life together. It is very common for people to want clauses dictating who gets the house, how much alimony will be paid, or even bizarre lifestyle rules about weight gain or infidelity. 📝
However, you cannot just write whatever you want into a legal document. The Ontario Family Law Act puts strict boundaries on what domestic contracts can actually enforce. If you include illegal clauses in your agreement, a judge at the Superior Court of Justice might throw the entire document in the garbage during a divorce.
This guide will explain exactly what is legally allowed in your agreement, highlight the forbidden topics regarding children and the family home, and discuss why hiring a local family law firm is the only way to ensure your contract survives a court challenge.
Step-by-Step Process in Ontario
Whether you are planning a wedding in Toronto, Mississauga, or Ottawa, the provincial laws are identical. A marriage contract is designed to let you opt out of the standard equalization formula, but you must negotiate these terms within the bounds of the law. 📍
Understanding these boundaries before you meet with your lawyer will save you hours of expensive, wasted billable time.
Step 1: Address Property and Debt Division (Allowed)
The main purpose of a marriage contract is to protect your assets. You are fully allowed to state that specific assets—such as a business you started before the wedding, or a future inheritance—will be excluded from your Net Family Property calculation if you separate. ❗
You can also dictate how joint debts will be paid off, and you can agree that any property kept in a separate bank account remains the sole property of the person whose name is on the account.
Step 2: Negotiate Spousal Support Carefully (Allowed with Limits)
You can legally include a clause that limits or completely waives spousal support. For example, you can agree that neither spouse will ever seek financial support from the other, regardless of how long the marriage lasts.
However, there is a catch. Under Section 33(4) of the Family Law Act, an Ontario judge has the power to override your spousal support waiver if enforcing it decades later would be “unconscionable.” If one spouse becomes severely disabled and would end up on social assistance, the judge will force the wealthier spouse to pay support anyway.
Step 3: Avoid All Child-Related Clauses (Forbidden)
This is the most common mistake. You absolutely cannot include any clauses that pre-determine decision-making responsibility (formerly custody), parenting time (formerly access), or child support for children that do not exist yet or are minors. 💪
Child support is the legal right of the child, governed by the Federal Child Support Guidelines. Parents cannot bargain it away. Any clause in a marriage contract dealing with future children is legally void and will be instantly struck down by a judge.
Step 4: Respect the Matrimonial Home Rule (Forbidden)
In Ontario, the matrimonial home has a special, highly protected legal status. Under Part II of the Family Law Act, both legally married spouses have an equal right to possess and live in the matrimonial home, regardless of whose name is on the deed.
You cannot include a clause that says “If we divorce, the wife must move out within 24 hours because the husband owns the house.” You cannot contract out of these possessory rights. You can dictate how the equity (money) of the home is split, but you cannot dictate who gets to live there during a separation.
How Much Does it Cost in Ontario?
Drafting a valid marriage contract that respects all provincial boundaries requires a deep understanding of family law. If you use a cheap online template that contains illegal clauses, your “savings” will evaporate when the contract fails in court. 💰
Here is a breakdown of the typical costs you might face:
| Service / Consequence | Estimated Cost (CAD) | Who Pays? |
|---|---|---|
| Lawyer (Drafting Valid Contract) | $2,000 – $5,000+ Flat/Hourly | The requesting spouse |
| Independent Legal Advice (ILA) | $500 – $1,500 Flat Fee | The other spouse |
| Cost of a Voided Contract | Loss of 50% of your wealth | The wealthier spouse |
| Litigating a Flawed Contract | $25,000 – $75,000+ in court | Both spouses |
Having two separate law firms review the document ensures that any forbidden clauses are removed before you sign, protecting the overall integrity of your agreement.
How Long Does the Process Take?
Because you must carefully negotiate what is legally allowed, drafting a strong marriage contract takes time. Exchanging financial disclosure and determining the value of your assets typically takes 3 to 6 weeks. ⏱
Negotiating the specific clauses, especially around spousal support waivers, can take another 1 to 2 months of back-and-forth between the two law firms.
To avoid rushing and risking a claim of “duress,” family lawyers advise that the entire process should be completed and signed at least 3 to 6 months before your wedding day.
Frequently Asked Questions (FAQ)
Can we include an “infidelity penalty” clause?
In Canada, divorce is strictly “no-fault.” While you technically can write a lifestyle clause that says “if someone cheats, they get less money,” Ontario family court judges are extremely reluctant to enforce them. Proving infidelity is messy and expensive, making these clauses practically useless in Ontario.
Can we decide who gets the dog in the contract?
Yes. Unlike children, pets are considered personal property under Ontario law. You can absolutely include a clause in your marriage contract stating exactly who retains ownership of the family dog or cat in the event of a separation.
What happens if one illegal clause is in the contract?
A well-drafted contract will include a “severability clause.” This means if a judge strikes down one illegal sentence (like a clause trying to limit child support), the rest of the contract regarding property and businesses will survive and remain perfectly valid.
Can I protect the house I bought before the wedding?
You can protect the financial equity of the house using a marriage contract, ensuring you keep the value of the home. However, if you live in it together as a married couple, it becomes the “matrimonial home,” meaning you cannot legally force your spouse to move out without a proper separation agreement or court order.
Should I hire a law firm to write my marriage contract?
Yes. Using a cheap DIY template is dangerous because it often includes language that violates the Family Law Act. A local family law firm knows exactly how to phrase your protections so that an Ontario judge will uphold the contract decades later.
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