Under the Ontario Family Law Act, any clause in a marriage contract regarding decision-making responsibility, parenting time, or child support for future children is entirely legally void. An Ontario family court judge will always make decisions based purely on the best interests of the child at the actual time of separation.
When couples are planning to get married, they often want to map out every detail of their future life together. It is completely natural to have deep conversations about how you want to raise your future children. Some couples try to formalize these promises by asking their lawyers to include rules in their marriage contract dictating that children must be raised in a specific religion, attend private school, or that a specific parent will get primary care if the marriage fails.
If you live in Kitchener, Vaughan, or Markham, you must understand a critical limitation of provincial law: you cannot contract away the rights of children who do not even exist yet. The Ontario Family Law Act explicitly prohibits couples from making binding agreements about the future decision-making responsibility (formerly known as custody) and parenting time of children. Any such clause is considered legally invisible to a judge. To navigate what you can and cannot include in your agreement, consulting a knowledgeable family lawyer from our directory is essential. 📚
Step-by-Step Process for Family Planning in an Ontario Marriage Contract
While you cannot write legally binding rules about children in a prenup, you can still craft a powerful contract to protect your financial assets. Here is how a law firm will guide you through drafting an agreement when children are part of your future plans.
Step 1: Exclude Parenting Time and Decision-Making Clauses
Section 52(1) of the Ontario Family Law Act allows couples to agree on property division and spousal support. However, Section 52(2) explicitly states that any provision dealing with the right to direct the education and moral training of children is absolutely void. Your lawyer will actively refuse to include paragraphs stating “The mother gets primary residence” or “The children must be raised Catholic,” as including them damages the credibility of the entire document.
Step 2: Avoid Child Support Limitations
You cannot use a marriage contract to opt out of paying child support. Child support is the fundamental right of the child, not the parent. Under Section 56(1) of the Act, an Ontario judge has the supreme authority to disregard any provision respecting child support if they feel it is unreasonable and does not meet the mandatory Federal Child Support Guidelines based on your income in 2026. 💵
Step 3: Focus on Spousal Support and Property
Because you cannot predict the future needs of a child, focus your contract on what is legally permissible: the adults. You can dictate how the matrimonial home will be divided or how pensions are handled. You can also negotiate spousal support limits. However, keep in mind that if one spouse sacrifices their career to stay home and raise the children, an Ontario judge might overturn a strict spousal support waiver if it leaves that parent impoverished.
Step 4: Draft a Strict Severability Clause
If an overly aggressive lawyer accidentally slips a clause about child rearing into the contract, it can create massive legal vulnerabilities. Your contract must contain a “severability clause.” This legally ensures that if a judge strikes down the illegal parenting clause, the rest of the contract-such as the protection of your business assets-remains fully legally binding.
Step 5: Utilize a Separation Agreement Later
If the unfortunate happens and the marriage breaks down, that is the exact moment when you negotiate parenting issues. Instead of relying on a decade-old prenup, you and your ex-partner will draft a comprehensive Separation Agreement or a Parenting Plan. At that time, decisions are made based on the actual ages, needs, and circumstances of the living children. 🤝
How Much Does a Prenup Cost in Ontario?
Drafting a marriage contract that correctly avoids illegal child clauses requires professional expertise. Estimated costs in Canadian dollars (CAD) for a standard agreement are:
| Requirement / Service | Estimated Cost (CAD) | Details |
|---|---|---|
| Lawyer Drafting Fee | $2,500 – $5,000+ | For drafting the core property and spousal support clauses. |
| Independent Legal Advice (ILA) | $800 – $1,500+ | Mandatory consultation for the second spouse to review the draft. |
| Future Parenting Plan / Separation | $3,000 – $10,000+ | If you divorce later and need to draft an actual parenting agreement. |
How Long Does the Process Take?
Properly negotiating and finalizing an Ontario marriage contract generally takes between 1 to 3 months. Because future children completely alter a family’s financial landscape, lawyers need time to draft nuanced “if/then” scenarios regarding spousal support (e.g., “If we have children, spousal support will be calculated differently than if we remain childless”).
Frequently Asked Questions (FAQ)
Can we sign a contract agreeing on a school now?
No. Any agreement in a marriage contract regarding the future education of a child is legally void. If you divorce ten years later, the judge will determine the appropriate school based on the best interests of the child at that specific time, ignoring your old contract.
What about “pet custody” in a prenup?
Unlike children, pets are considered personal property under Ontario law. You absolutely can include a clause in your marriage contract stating who gets to keep the family dog or cat if the relationship ends. This is highly recommended to avoid bitter disputes later.
Will a judge care about our religious promises later?
A family court judge’s only mandate is the “best interests of the child.” While they may look at the established religious practices the child grew up with, they will not enforce a religious promise made in a prenup before the child was even born.
Can we set up an RESP trust in the prenup?
Yes. While you cannot dictate child support limits, you can include clauses regarding how future joint assets, such as a Registered Education Savings Plan (RESP), will be managed or funded during the marriage. However, an Ontario judge always has the final say on child-related finances upon separation.
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