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Find a Lawyer » Canada Legal Guides » Ontario Legal Guides » Family Law & Divorce Ontario » Marriage Contracts & Prenups Ontario » How Dentists and Orthodontists Use Prenups to Protect Their Practices in Ontario

How Dentists and Orthodontists Use Prenups to Protect Their Practices in Ontario

11 Jun 2026 5 min read No comments Marriage Contracts & Prenups Ontario
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For Ontario dentists, a Marriage Contract ensures that expensive clinical equipment and patient “goodwill” within your Dentistry Professional Corporation (DPC) are protected during a divorce. Without a valid contract excluding the practice, you may be forced to buy out your ex-spouse’s 50% share of the marital growth, potentially bankrupting the clinic.

Owning and operating a dental or orthodontic practice in Ontario requires massive upfront capital. Between purchasing panoramic X-ray machines, outfitting operatories, and acquiring an established patient list, the value of a Dentistry Professional Corporation (DPC) can easily reach into the millions. However, if a dentist goes through a divorce without a Marriage Contract, the Family Law Act treats the growth of that dental practice exactly like a shared bank account. The law dictates that any increase in the clinic’s value from the wedding day to the separation date must be equalized (split 50/50).

For practitioners in competitive markets like Mississauga, Hamilton, and Markham, this presents a severe crisis. The Royal College of Dental Surgeons of Ontario (RCDSO) strictly prohibits non-dentists from owning voting shares or directing clinical operations. This means you cannot simply hand over half of your clinic to your ex-spouse. Instead, you must pay them their half in cash. To avoid taking out crippling corporate loans to fund a divorce settlement, modern dental professionals rely on comprehensive Marriage Contracts (prenups). Here is how you can legally shield your life’s work.

Step-by-Step Process in Ontario for Dentists

A dental practice has both tangible assets (chairs, drills) and massive intangible assets (goodwill, patient lists). Protecting both requires a highly detailed approach and the assistance of an experienced Ontario family law firm.

Step 1: Establishing the Baseline Valuation of the Clinic

📈 To protect your practice, you must first prove what it is worth on the day you get married. This is your baseline. You should hire a Chartered Business Valuator (CBV) who specializes in dental practices. They will calculate the value of your hard assets and the “goodwill” of your patient roster. This documented valuation forms the bedrock of the financial disclosure attached to your Marriage Contract.

Step 2: Drafting the Comprehensive Exclusion Clauses

Your lawyer will draft an ironclad exclusion clause explicitly removing the DPC from the calculation of Net Family Property. This clause must be incredibly thorough. It must state that the corporation’s shares, the physical clinic equipment, the commercial real estate (if your corporation owns the building), and the patient goodwill are completely exempt from equalization, regardless of how much they grow in value during the marriage.

Step 3: Negotiating Spousal Support Releases

In addition to dividing assets, divorce often triggers spousal support (monthly payments). Since your income is directly tied to the success of your excluded clinic, your spouse may argue for higher spousal support to compensate for not getting a piece of the business. A strong Marriage Contract will explicitly cap or define spousal support formulas, ensuring that a future judge does not simply award massive monthly payments as a backdoor way to divide the corporate wealth.

Step 4: Executing with Independent Legal Advice (ILA)

For the agreement to withstand a court challenge, your fiancé must receive Independent Legal Advice. They must consult their own lawyer who will explain that by signing this contract, they are walking away from hundreds of thousands of dollars in potential future wealth. Once both lawyers sign the Certificates of ILA, the contract is legally binding.

How Much Does it Cost in Ontario?

Securing a DPC is a complex legal procedure, but the cost is negligible compared to losing half your clinic’s value.

  • Family Lawyer Drafting Fees: A highly customized Marriage Contract for a dental professional typically costs $3,500 to $8,000 CAD.
  • Independent Legal Advice (ILA): Your partner’s independent lawyer will usually charge between $1,500 and $3,500 CAD.
  • Dental Practice Valuation (CBV): A professional valuation to establish your baseline corporate worth generally ranges from $4,000 to $7,000 CAD depending on the number of clinic locations.

How Long Does the Process Take?

📅 You cannot surprise a partner with a complex corporate prenup right before the wedding. Courts routinely throw out contracts signed under last-minute duress.

  • Practice Valuation: A CBV usually takes 4 to 8 weeks to review your books and finalize the valuation report.
  • Legal Drafting: Your lawyer will need 2 to 4 weeks to draft the custom DPC exclusion clauses.
  • Negotiation Period: Allowing the other lawyer time to review and request amendments generally takes 4 to 8 weeks.
  • Total Timeframe: Begin the process at least 6 months before your wedding day to ensure a stress-free signing.

Comparison: Tangible Assets vs. Intangible Goodwill

Asset Type in a Dental ClinicWhat Does it Include?Is it Protected by the Contract?
Tangible Hard AssetsX-ray machines, dental chairs, computer servers, inventory.Yes. Explicitly excluded from net family property.
Intangible GoodwillBrand reputation, patient loyalty, recurring hygiene appointments.Yes. The contract prevents the ex-spouse from valuing and claiming goodwill.
The Matrimonial HomeThe primary house you live in with your spouse.No. Unless specifically negotiated, the family home is treated differently under Ontario law.

Frequently Asked Questions (FAQ)

Can I protect a future clinic I haven’t opened yet?

Yes. A properly drafted Marriage Contract can include a “future corporate structures” clause. This ensures that if you start a new clinic, acquire a partner’s practice, or open a secondary location during the marriage, those new assets are also excluded from equalization.

Can my spouse work at my clinic as the office manager?

They can, but it is incredibly risky without a prenup. If your spouse contributes labour to the clinic, they might file a “trust claim” (unjust enrichment) during a divorce, arguing their hard work increased the clinic’s value. Your contract must state that any employment is purely transactional and grants no ownership rights.

What if my DPC shares are held in a family trust?

If your shares are owned by a trust, the legal ownership is separated from you personally. However, family trusts are highly scrutinized in Ontario divorce courts. Your Marriage Contract should explicitly address your interest as a beneficiary of the trust to ensure absolute protection.

Does my spouse get half of my clinic if I die?

It depends on your Marriage Contract and your Will. A standard Marriage Contract usually includes a “release against the estate,” meaning the surviving spouse cannot sue the estate for a piece of the clinic. However, you can still voluntarily leave them the value of the clinic in your Last Will and Testament.

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