Under the Family Law Act in Ontario, the growth in value of your Medicine Professional Corporation (MPC) during the marriage is normally split 50/50. By drafting a Marriage Contract (prenup), doctors can legally exclude their corporate shares from equalization, protecting their practice from a forced valuation or dissolution. A complex medical prenup generally costs between $3,500 and $7,500 CAD.
When physicians and surgeons build their careers in Ontario, many choose to incorporate to optimize their tax planning and save for retirement. A Medicine Professional Corporation (MPC) allows doctors to retain earnings at a much lower corporate tax rate. However, when a medical professional gets married, those retained earnings become highly vulnerable. If the marriage ends in divorce, the law requires an “equalization of net family property.” This means any increase in the value of your MPC from the date of marriage to the date of separation must be split equally with your spouse.
Whether you are operating a busy family clinic in Toronto, a specialty practice in Ottawa, or holding hospital privileges in London, an unprotected MPC can lead to financial devastation during a divorce. Because doctors cannot simply “sell” half of their medical corporation to an unlicensed spouse, they are often forced to empty their retirement savings or take on massive corporate debt to buy out their ex-partner. Drafting a Marriage Contract (commonly called a prenup) is the only legally secure way to shield your medical practice. Here is how Ontario doctors can protect their life’s work as of May 2026.
Step-by-Step Process in Ontario for Doctors
Drafting a Marriage Contract for a medical professional is highly complex. The courts will easily strike down an unfair contract if it is not executed properly. Therefore, both parties must engage their own Ontario family law firm to navigate the strict requirements of the Family Law Act.
Step 1: Completing Full Financial Disclosure
📊 The cornerstone of any unbreakable Marriage Contract is transparency. You cannot protect an asset if you hide it. You must provide a comprehensive breakdown of your corporate and personal finances, typically using a Form 13.1 Financial Statement. This includes providing your spouse with the MPC’s recent financial statements, corporate tax returns, and a current estimated valuation of the practice. If you conceal the true value of your corporation, an Ontario judge will likely invalidate the entire contract years later.
Step 2: Drafting the Corporate Exclusion Clause
Your family lawyer will draft specific clauses to exclude your MPC from the equalization calculation. This clause explicitly states that any current value, future growth, and future retained earnings within the corporation remain 100% your property if a separation occurs. You must also include clauses addressing shareholder loans and dividends to ensure that money moving in and out of the corporation is also protected.
Step 3: Addressing Spousal Support Expectations
Many doctors have spouses who sacrifice their own careers to manage the household or raise children. A judge will heavily scrutinize a contract that leaves a doctor with millions in a corporation while the ex-spouse gets nothing. A strong Marriage Contract will clearly outline how spousal support will be handled. You might agree to a predetermined lump-sum payout or a set monthly support formula to ensure the contract remains fair and legally enforceable.
Step 4: Obtaining Independent Legal Advice (ILA)
For the contract to be valid in Ontario, your fiancé or spouse must receive Independent Legal Advice (ILA). They must hire their own independent family lawyer to review the contract, explain how it strips away their statutory rights to the MPC’s growth, and sign a Certificate of ILA. Without this certificate, your spouse can later claim they did not understand what they were signing.
How Much Does it Cost in Ontario?
Protecting a multi-million-dollar medical corporation requires specialized legal expertise, making these contracts more expensive than standard prenups.
- Drafting Lawyer Fees: Hiring a senior family lawyer to draft a customized medical Marriage Contract typically costs between $3,500 and $7,500 CAD.
- Independent Legal Advice (ILA): Your spouse’s lawyer will generally charge between $1,500 and $3,000 CAD to review the document and negotiate minor changes.
- Business Valuation (Optional): If your practice is highly complex, you may need a Chartered Business Valuator (CBV) to establish the baseline value, costing roughly $3,000 to $5,000 CAD.
How Long Does the Process Take?
⏱ A Marriage Contract should never be rushed, especially when complex corporate structures are involved. Presenting it the week before a wedding is a recipe for a court challenge based on duress.
- Financial Disclosure Gathering: Working with your accountant to prepare the corporate documents usually takes 2 to 4 weeks.
- Drafting the Contract: Your lawyer will need 2 to 3 weeks to draft the specific exclusion clauses.
- Negotiation and ILA: Allowing your spouse’s lawyer to review and negotiate the terms typically takes 3 to 6 weeks.
- Overall Timeline: Plan to start the process at least 4 to 6 months before your wedding date.
Comparison: MPC With vs. Without a Marriage Contract
| Scenario | Without a Marriage Contract | With a Properly Drafted Contract |
|---|---|---|
| Corporate Growth During Marriage | Divided 50/50 through an equalization payment. | 100% excluded and retained by the doctor. |
| Retained Earnings in the MPC | Viewed as family assets to be divided. | Safely locked within the corporation. |
| Risk of Forced Liquidation | Very High (To afford the buyout payment). | Zero (Practice remains entirely separate). |
Frequently Asked Questions (FAQ)
Can my spouse own non-voting shares in my MPC?
Yes. Under the College of Physicians and Surgeons of Ontario (CPSO) rules, a spouse can hold non-voting shares for income splitting. However, your Marriage Contract must include a mandatory “share buyback” clause, forcing the spouse to sell those shares back to you for a nominal fee (e.g., $1.00) in the event of a divorce.
What happens if I use corporate dividends to pay off our family mortgage?
In Ontario, the matrimonial home holds special legal status. If you use protected corporate funds to pay down the mortgage on the house you both live in, that money generally loses its protection and becomes subject to a 50/50 split. Your lawyer must draft the contract carefully to address how the matrimonial home is treated.
Can a Marriage Contract protect me from paying child support?
Absolutely not. Under Canadian family law, the right to child support belongs to the child, not the parent. Any clause in a Marriage Contract attempting to limit or eliminate child support is completely void and will be struck down by a judge.
Can I sign a Marriage Contract after I am already married?
Yes. In Ontario, you can sign a postnuptial agreement (which is technically still called a Marriage Contract under the Family Law Act) at any time during your marriage. The requirements for financial disclosure and Independent Legal Advice remain exactly the same.
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