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Find a Lawyer » Canada Legal Guides » Ontario Legal Guides » Mississauga Legal Guides » Real Estate, Housing & Civil Disputes Mississauga » Local Civil Litigation & Small Claims Mississauga » What to do if a business partner breaches their fiduciary duty in Mississauga

What to do if a business partner breaches their fiduciary duty in Mississauga

23 May 2026 4 min read No comments Local Civil Litigation & Small Claims Mississauga
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If a business partner in Mississauga steals company funds, hides profits, or secretly competes against you, they have breached their fiduciary duty under Ontario law. To recover your financial losses, you must file a lawsuit at the Superior Court of Justice, which requires hiring a commercial litigation lawyer typically costing $300 to $600 CAD per hour.

Starting a business with a partner in Mississauga is built on a foundation of absolute trust. When you enter into a partnership or become co-directors of a corporation, the law expects you to act in the best interests of the company. Unfortunately, greed and disagreements can lead a partner to siphon money from corporate accounts, steal your biggest clients, or launch a secret competing business.

In Ontario, this betrayal is known as a “breach of fiduciary duty.” ⚖️ A fiduciary duty is the highest standard of care in law, requiring absolute loyalty and good faith. When a partner violates the Partnerships Act or the Business Corporations Act, the financial damage can destroy your livelihood. Acting swiftly to protect the company’s assets and demanding legal accountability is crucial to saving your business.

Step-by-Step Process for Handling a Corporate Dispute

Business disputes can escalate into volatile situations very quickly. Instead of engaging in a screaming match, you must approach the betrayal with a cold, calculated legal strategy. Navigating a breach of fiduciary duty in Mississauga involves precise steps to secure your assets and prepare for litigation at the Superior Court of Justice.

Step 1: Secure the Company’s Assets and Data

Your immediate priority is to stop the bleeding. 🔒 If you have the legal authority as a director, immediately contact your business bank to freeze joint accounts or require dual signatures for all transfers. Change passwords to critical company emails, client databases, and accounting software to prevent the rogue partner from deleting evidence or stealing more data.

Step 2: Gather Forensic Financial Evidence

Judges require hard proof, not just suspicions. You need to compile bank statements, cancelled cheques, and email communications that show the partner acting against the company’s interests. It is highly recommended to hire a forensic accountant to trace hidden money, identify fake vendor invoices, or calculate the exact value of the stolen clients.

Step 3: Review the Corporate Agreements

Before rushing to the courthouse, your civil litigation lawyer must review your foundational documents. 📋 If you have a written Partnership Agreement or a Unanimous Shareholder Agreement, it likely contains specific clauses on how to expel a rogue partner or mandatory arbitration rules. If you do not have a written agreement, your dispute will be governed strictly by Ontario’s default corporate statutes.

Step 4: File a Lawsuit at the Superior Court

If the partner refuses to return the money or step down, your lawyer will file a Statement of Claim for breach of fiduciary duty. In extreme emergencies-for example, if the partner is actively transferring funds to an offshore account-your lawyer can seek an emergency “injunction” from a judge to legally force them to stop their activities immediately.

How Much Does Commercial Litigation Cost in Ontario?

Fighting a business partner in court is one of the most expensive forms of civil litigation. 💵 Because these cases involve complex corporate laws and extensive financial records, they require significant legal resources.

  • Lawyer Hourly Rates: Commercial litigation lawyers in Mississauga generally charge between $300 and $600 CAD per hour. Senior partners handling multi-million dollar corporate disputes may charge over $800 CAD per hour.
  • Retainer Agreements: To start working on an emergency injunction or a complex lawsuit, expect your law firm to require a trust deposit of $10,000 to $20,000 CAD.
  • Forensic Experts: Hiring a certified forensic accountant or a business valuation expert to quantify the damages will typically cost between $5,000 and $15,000 CAD.
  • Court Filing Fees: The basic government fee to issue a Statement of Claim at the Ontario Superior Court of Justice is roughly $237 CAD.
ActionBreach of Fiduciary Duty?Legal Remedy
Stealing Company FundsYes. Clear violation of trust.Lawsuit for repayment and potential punitive damages.
Starting a Secret Competing BusinessYes. A partner cannot compete with their own firm.Injunction to shut down the competitor and seize profits.
Disagreeing on Marketing StrategyNo. This is standard business friction.Negotiation or buying out the partner’s shares.

How Long Does the Process Take?

The timeline for resolving a partnership dispute depends entirely on the aggression of both parties. If your lawyer files for an emergency injunction to freeze bank accounts, that specific hearing can happen within a matter of days or weeks.

However, if the case must proceed all the way through documentary discoveries to a full trial at the Superior Court, the litigation process is painstakingly slow. ⌛ A standard corporate lawsuit in Ontario takes between 2 to 4 years to reach a final judgment. Fortunately, most business disputes are settled out of court through mediation or a buyout agreement long before a trial happens.

Frequently Asked Questions (FAQ)

Can I legally lock my partner out of the office?

You must be extremely careful. If your partner is an equal shareholder or listed on the commercial lease, locking them out without a court order or a specific clause in your Shareholder Agreement could result in them suing you for oppression. Always consult a lawyer before changing the locks.

What if we don’t have a written partnership agreement?

If you operate a business together without a written contract, the relationship is automatically governed by Ontario’s Partnerships Act. The law still imposes a strict fiduciary duty on both partners to act honestly and share profits equally.

Can I sue my business partner for emotional distress?

In commercial litigation, judges rarely award damages for emotional distress or “hurt feelings.” Civil courts focus on strict financial losses. Your claim must prove exactly how much money the business lost due to the partner’s actions.

What is an oppression remedy?

Under the Ontario Business Corporations Act, if a majority shareholder uses their power to unfairly prejudice or disregard the interests of a minority shareholder, the minority shareholder can file an “oppression remedy” claim to ask a judge to intervene and fix the unfairness.

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