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Find a Lawyer » Canada Legal Guides » Ontario Legal Guides » Family Law & Divorce Ontario » Marriage Contracts & Prenups Ontario » Can the Same Law Firm Represent Both Spouses for a Prenup in Ontario?

Can the Same Law Firm Represent Both Spouses for a Prenup in Ontario?

14 Jun 2026 4 min read No comments Marriage Contracts & Prenups Ontario
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No, one law firm cannot represent both spouses when drafting a marriage contract (prenup) in Ontario. The Law Society of Ontario strictly forbids this due to conflict of interest. To make the contract legally binding, each partner must hire their own independent lawyer from completely separate law firms.

When an engaged couple decides to sign a marriage contract, they often agree on all the terms beforehand. Because everyone is happy and trying to save money, a common question arises: “Can we just use one lawyer to write it up for both of us?” In Ontario, the simple answer is no. Even if you completely agree on every single detail, sharing a lawyer for a marriage contract is legally impossible.

The rules governing lawyers in this province are extremely strict. 📍 Whether you are in Kitchener, Vaughan, Toronto, or Hamilton, the Law Society of Ontario considers a marriage contract to be an adversarial agreement. This means that what benefits one spouse usually disadvantages the other under the Family Law Act. One lawyer cannot ethically fight for both sides at the same time.

Step-by-Step Process for Separate Representation in Ontario

To ensure your marriage contract will be upheld by the Superior Court of Justice years down the road, you must follow the correct procedure for legal representation. Here is how a couple correctly navigates this requirement.

Step 1: One Spouse Hires the Drafting Lawyer

Usually, the person who requested the marriage contract (or the person with more assets) will hire a family law firm first. 💼 This lawyer becomes the “drafting lawyer.” They will meet with their client, gather their financial disclosure, and write the first draft of the contract. This lawyer represents only one person.

Step 2: The Second Spouse Hires an Independent Lawyer

The second spouse must then go out and hire a completely different lawyer from a completely different law firm. You cannot even use two different lawyers who work in the same office building if they share a firm name. Trying to use a “Chinese Wall” (an imaginary barrier between lawyers in the same firm) is not acceptable for marriage contracts in Ontario.

Step 3: Exchanging Financial Disclosure

Before any negotiations begin, both law firms must exchange full financial disclosure. 📝 Both spouses will swear an oath detailing their bank accounts, properties, debts, and income. Each lawyer will review the other side’s documents to ensure their client is not being tricked into a bad deal.

Step 4: Independent Legal Advice (ILA) and Negotiation

The second lawyer provides Independent Legal Advice (ILA) to their client. 🗣 They will explain how the proposed contract changes the client’s standard rights under the Family Law Act regarding spousal support and property division. The two independent lawyers will then negotiate back and forth to reach a fair compromise.

Step 5: Signing the Contract Safely

Once both lawyers and both spouses are happy, the final document is signed. Each lawyer will attach a Certificate of Independent Legal Advice. Because two separate law firms were involved, it is almost impossible for one spouse to later complain to a judge that they were forced into signing it.

How Much Does It Cost for Two Lawyers in Ontario?

Yes, hiring two law firms means paying two bills. However, this is the only way to make the contract legally waterproof in Canada.

  • The Drafting Lawyer’s Fee: The lawyer who does the heavy lifting of writing the custom contract will usually charge between $1,500 and $3,500 CAD.
  • The Reviewing (ILA) Lawyer’s Fee: The second lawyer, who reviews the document and negotiates changes, usually charges between $500 and $1,500 CAD.
  • Who Pays? It is perfectly legal and very common in Ontario for one spouse to pay the invoice for both lawyers. However, the reviewing lawyer still only takes legal instructions from the spouse they are advising.
ScenarioIs This Allowed in Ontario?Risk Level
One lawyer advises both spousesNo (Unethical)Extremely High. The contract will be voided.
Two lawyers from the SAME firmNo (Conflict of Interest)High. The Law Society prohibits this.
Two lawyers from DIFFERENT firmsYes (Required)Low. This is the correct legal standard.

How Long Does the Process Take?

Coordinating between two separate law firms takes a bit of organization. Once the first lawyer drafts the contract, the second lawyer needs time to review it. Factoring in the exchange of financial documents and standard negotiations, the entire process generally takes 4 to 8 weeks. Do not leave this until the month of your wedding, as law firms are busy and cannot rush a proper review.

Frequently Asked Questions (FAQ)

What exactly is a conflict of interest?

A conflict of interest happens when a lawyer’s loyalty to one client interferes with their loyalty to another. In a marriage contract, limiting spousal support hurts one partner and helps the other. One lawyer cannot ethically do both.

Can one of us just skip getting a lawyer to save money?

You can, but it is highly discouraged. If one spouse refuses to get an ILA lawyer, the drafting lawyer will make them sign a waiver. However, Ontario judges often throw out contracts where one person had a lawyer and the other did not.

Can the drafting lawyer’s paralegal give me advice?

No. Paralegals in Ontario are not licensed to practice family law or draft marriage contracts. Furthermore, an employee of the same firm creates the exact same conflict of interest.

What if we write the contract ourselves and bring it to a lawyer?

Even if you write it yourselves, a single lawyer cannot advise both of you on whether the contract is fair. They will send one of you away to find another law firm before they will certify the document.

Can we use an online mediation service instead?

A mediator can help you agree on terms peacefully, but a mediator is neutral and does not provide legal advice. After mediation, you will still each need your own independent lawyer to turn the agreement into a legally binding marriage contract.

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