Under Section 53(2) of Ontario’s Family Law Act, if you and your common-law partner sign a valid Cohabitation Agreement and later get legally married, that agreement automatically transforms into a legally binding Marriage Contract (prenup). You generally do not need to draft a completely new contract unless you want to change the terms.
Living together before getting married is incredibly common in cities like Toronto, Ottawa, and Mississauga. To protect their individual assets and avoid messy “unjust enrichment” claims if they break up, many smart couples choose to sign a formal Cohabitation Agreement. 📝
However, as your relationship grows and you decide to officially tie the knot, you might wonder if that old document becomes useless. Many people assume they need to spend thousands of dollars to hire family lawyers to draft a brand-new prenuptial agreement from scratch.
Fortunately, Ontario law makes this transition seamless. This guide will explain how Section 53(2) works, the major legal trap regarding the “matrimonial home” that catches many newlyweds off guard, and the step-by-step process to safely amend your agreement if your life has changed.
Step-by-Step Process in Ontario
Whether you rent an apartment in London or own a home in Hamilton, the Family Law Act governs your domestic contracts. The transition from common-law partners to legally married spouses triggers a massive shift in your legal rights, but your existing contract can continue to protect you if handled correctly. 📍
Before you walk down the aisle, you must review your current paperwork to ensure it still reflects your financial goals.
Step 1: Understand Section 53(2) of the Family Law Act
The most important thing to know is that you do not automatically need a new contract. Section 53(2) explicitly states that if a couple signs a Cohabitation Agreement and later marries, the agreement is “deemed to be a marriage contract.” ❗
This means all the clauses you agreed upon—such as keeping your pensions separate or waiving spousal support—will continue to be legally binding and will govern your divorce if the marriage eventually breaks down.
Step 2: Check for a “Sunset Clause”
You must read your original document carefully. While the law automatically converts the contract, your specific agreement might have a built-in expiration date, known as a “sunset clause.”
Sometimes, lawyers include a clause that explicitly states the Cohabitation Agreement becomes null and void the moment you get legally married. If your document has this clause, you are completely unprotected upon marriage and must draft a new contract immediately.
Step 3: Review the Matrimonial Home Trap
This is the biggest risk for common-law couples transitioning to marriage. When you are common-law, the home belongs to whoever is on the title. When you get legally married, the home you live in becomes the “matrimonial home.” 💪
Under Ontario law, both married spouses have an absolute, equal right to live in the matrimonial home, and special rules apply to its financial equity. If your old Cohabitation Agreement does not specifically address how a future matrimonial home will be handled, you need to update it immediately to protect your real estate.
Step 4: Draft an Amending Agreement (If Needed)
If you need to update the rules about the house, or if your financial situation has changed significantly since you first moved in together, you do not need to start from scratch.
You and your partner can simply draft an “Amending Agreement.” Just like the original contract, this addendum must be in writing, signed, witnessed, and both of you must receive Independent Legal Advice (ILA) from separate family lawyers to make it binding.
How Much Does it Cost in Ontario?
The beauty of Section 53(2) is that it saves couples thousands of dollars. Letting the agreement automatically convert costs absolutely nothing. 💰
However, if you choose to review and amend the contract before the wedding, here is a breakdown of the typical costs you can expect:
| Service / Legal Action | Estimated Cost (CAD) | Who Pays? |
|---|---|---|
| Automatic Conversion | $0 (Free under the FLA) | N/A |
| Lawyer Review of Old Contract | $350 – $750 (Consultation) | The inquiring spouse |
| Drafting an Amending Agreement | $1,000 – $2,500+ Flat Fee | Often split or paid by one spouse |
| Independent Legal Advice (ILA) | $500 – $1,500 Flat Fee | The responding spouse |
It is always a smart financial decision to pay a lawyer for a one-hour consultation just to read your old agreement and confirm it will hold up in the Superior Court of Justice if a divorce ever happens.
How Long Does the Process Take?
The legal conversion from a Cohabitation Agreement to a Marriage Contract happens instantly. The exact second you say “I do” and are pronounced legally married, the document transforms automatically. ⏱
If you decide to draft an Amending Agreement to address new assets or a new matrimonial home, the negotiation process usually takes 1 to 2 months.
Because you must exchange updated financial disclosure and obtain new Independent Legal Advice, family lawyers strongly advise completing any amendments at least 3 to 6 months before the wedding day to avoid signing under “duress.”
Frequently Asked Questions (FAQ)
Do we need to sign the contract again after the wedding?
No. Assuming there is no clause in the contract stating it expires upon marriage, you do not need to re-sign it, notarize it, or file any special paperwork with the province. Section 53(2) handles the transition automatically.
What if we didn’t get Independent Legal Advice originally?
If you skipped Independent Legal Advice (ILA) when you signed the Cohabitation Agreement, the document is highly vulnerable. An Ontario judge could easily invalidate it during a divorce. It is highly recommended to draft a completely new, proper Marriage Contract with two separate lawyers before the wedding.
Does the contract cover child support if we have kids now?
No. Under Ontario law, you cannot contract out of child support or determine decision-making responsibility for children in a domestic contract. Any clause in your old agreement that attempts to waive child support is entirely void, though the property rules will remain valid.
Can we cancel the agreement after we get married?
Yes. If you both decide that you no longer want the contract to apply and you want to follow the standard 50/50 equalization rules of the Family Law Act, you can cancel it. However, you must sign a formal, witnessed “Termination Agreement” to legally void the old contract.
Should I hire a law firm to review my old agreement?
Yes. An experienced local family law firm can spot potential legal landmines, especially regarding how the contract handles the matrimonial home. A quick review can give you total peace of mind before you walk down the aisle.
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