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CIVIL DISPUTES GUIDE
Business & Commercial Disputes in Ontario
A practical guide to business-to-business disputes, failed deals, unpaid accounts, supplier issues, shareholder conflict, commercial leases, injunctions, demand letters and civil litigation strategy.
A business dispute can affect more than the amount on an invoice. It can interrupt operations, damage relationships, expose confidential information, delay transactions and consume management time. The right strategy depends on the value, urgency, leverage and evidence—not only who feels wronged.
Prepared by Tatyana Trusz, Trusz Law • Updated July 2026 • 15 min read
QUICK ANSWER
How should a business dispute be assessed?
A commercial dispute should be assessed by the contract, the evidence, the amount at stake, the urgency, the cost of the fight and the business consequences of each option.
The best path may be negotiation, a demand letter, payment plan, mediation, Small Claims Court, Superior Court, urgent relief or a business-focused settlement. Litigation is a tool, not always the first move.
IN THIS GUIDE
RELATED CIVIL DISPUTES
BUSINESS DISPUTE?
Protect the business while deciding whether to fight, settle or narrow the issue.
The first step is separating legal rights from commercial leverage.
THE SHORT ANSWER
A business dispute is both a legal problem and an operational decision
Commercial disputes often involve overlapping priorities:
- recovering money;
- protecting cash flow;
- preserving or ending a business relationship;
- stopping harmful conduct quickly;
- protecting confidential information;
- avoiding reputational harm;
- maintaining customer, supplier or employee confidence;
- limiting management distraction; and
- choosing a process that makes financial sense.
The legal strategy should match the business objective. A technically strong claim may still need a practical path to recovery, enforcement or settlement.
KEY TAKEAWAYS
At a glance
- Commercial disputes should be assessed by value, urgency, evidence, enforceability and business impact.
- Common disputes include unpaid invoices, failed deals, contract breaches, defective work, supplier issues and shareholder conflict.
- The best first step may be a demand letter, negotiation or preservation of evidence—not immediate litigation.
- Some disputes require urgent relief, such as an injunction, before final trial.
- Ontario Small Claims Court currently handles claims up to $35,000.
- Ontario’s basic limitation period is generally two years from discovery of the claim.
- Settlement should address payment, releases, confidentiality, return of property and future restrictions where appropriate.
COMMON DISPUTES
What kinds of commercial disputes arise in business?
| Dispute type | Common issue |
|---|---|
| Unpaid invoices | Work completed, goods delivered or services provided but payment withheld. |
| Failed deals | Parties disagree over deposits, conditions, closing obligations or who caused the failure. |
| Supplier and vendor disputes | Pricing, delivery, quality, exclusivity, chargebacks, returns or termination. |
| Service disputes | Scope, timelines, deliverables, performance standards or change orders. |
| Shareholder and partnership conflict | Control, money, access to records, oppression concerns, exits and buyouts. |
| Commercial lease disputes | Rent, repairs, default, renewal, exclusive use, deposits, arrears or lockouts. |
| Confidentiality and IP disputes | Misuse of information, customer lists, work product, branding, data or trade secrets. |
BUSINESS IMPACT
Why is commercial litigation different from a personal dispute?
Business disputes often require decisions under pressure. A claim may affect:
- cash flow;
- supplier relationships;
- customer commitments;
- credit terms;
- financing or investor confidence;
- employee morale;
- reputation;
- business continuity;
- ownership control; and
- future deal-making.
That is why the first assessment should not be limited to “Can we sue?” The better question is “What result protects the business and is worth the cost of pursuing?”
EVIDENCE STRATEGY
What evidence matters in a business dispute?
Useful evidence may include:
- signed contracts and amendments;
- purchase orders, quotes and invoices;
- emails, text messages and chat records;
- payment history;
- delivery and shipping records;
- performance logs and project timelines;
- financial statements and account ledgers;
- shareholder, partnership or operating agreements;
- corporate records;
- lease documents;
- photos, inspection reports or expert opinions;
- meeting notes and board minutes;
- settlement offers and demand letters; and
- documents proving loss and mitigation.
Evidence should be preserved early. Deleting messages, altering records or communicating carelessly after the dispute begins can create avoidable risk.
“A commercial dispute should be measured by more than who is right. It should be measured by proof, leverage, recovery, urgency and what the fight will do to the business.”
— Trusz Law
EARLY STRATEGY
What should a business do before suing or responding?
Early steps often shape the outcome.
Consider:
- collecting the contract, invoices and correspondence;
- identifying the exact legal parties;
- checking limitation periods;
- reviewing notice, cure and dispute-resolution clauses;
- preserving documents and messages;
- calculating the actual loss;
- checking collectability or enforcement risk;
- deciding who should communicate externally;
- avoiding admissions or inflammatory messages;
- considering whether urgent relief is needed; and
- assessing whether settlement is commercially preferable.
A fast demand letter may be helpful in some cases. In others, it is better to investigate first so the business does not overstate the claim or miss a stronger argument.
URGENT RELIEF
When is urgent court action needed?
Some business disputes cannot wait for ordinary litigation timelines.
Urgent relief may be considered where there is:
- misuse of confidential information;
- improper use of customer lists or trade secrets;
- risk that assets will disappear;
- improper lockout or interference with premises;
- serious harm to business operations;
- breach of restrictive covenants;
- attempted sale or transfer of disputed property;
- deadlock affecting business continuity; or
- urgent need to preserve evidence or status quo.
Injunctions and other urgent remedies are serious and evidence-driven. The business must usually act quickly and present a clear record.
COURT OPTIONS
Small Claims Court, Superior Court or another path?
The right forum depends on amount, urgency, remedy and complexity.
Small Claims Court
Ontario Small Claims Court currently handles claims for money or return of personal property up to $35,000, not including interest and costs. It can be useful for unpaid accounts, straightforward contract disputes and smaller business claims.
Superior Court of Justice
Higher-value disputes, injunctions, oppression claims, complex commercial litigation, real-estate remedies or claims above the Small Claims Court limit generally require Superior Court.
Negotiation, mediation or arbitration
Some contracts require mediation or arbitration. Even where not required, alternative dispute resolution may reduce cost, preserve relationships or narrow issues.
Limitation periods
Ontario’s basic limitation period is generally two years from discovery of the claim. Missing a deadline can bar the claim regardless of its merits.
SETTLEMENT STRUCTURE
What should a commercial settlement address?
A business settlement may need more than a payment amount.
Consider whether the settlement should address:
- payment timing;
- interest or discount for early payment;
- security or guarantees;
- return of goods, documents or data;
- delivery of remaining work;
- termination of the relationship;
- future non-disparagement or confidentiality;
- non-solicitation or customer-transition terms;
- mutual releases;
- default consequences if payment is missed;
- tax treatment; and
- dismissal or discontinuance of court proceedings.
A vague settlement can simply create a second dispute. The release and payment mechanics should be clear.
COMMON MISTAKES
Problems that make commercial disputes more expensive
Reacting emotionally before preserving evidence.
Angry messages may become exhibits.
Ignoring the written dispute-resolution clause.
The contract may require notice, mediation, arbitration or a specific forum.
Overlooking the real legal party.
The claim may be against a corporation, individual guarantor or different contracting entity.
Failing to calculate recoverable loss.
Being wronged is not the same as proving damages.
Waiting too long.
Limitation periods can bar the claim.
Continuing performance without reserving rights.
The business may weaken its position by acting inconsistently.
Making threats the business cannot or should not carry out.
Credibility matters in negotiation.
Ignoring collectability.
A judgment is less useful if recovery is unlikely.
Letting litigation strategy ignore business strategy.
The legal fight should support the commercial objective.
HOW TRUSZ LAW CAN HELP
Resolve the dispute with the business objective in view.
Trusz Law assists with Ontario business and commercial disputes, including contract disputes, unpaid invoices, supplier and service disagreements, shareholder and partnership conflict, commercial lease disputes, demand letters, settlement negotiations and civil litigation strategy.
Depending on the matter, that may include reviewing the evidence, assessing damages, preparing or responding to a demand letter, negotiating settlement, commencing or defending proceedings and identifying whether urgent relief is needed.
The goal is practical: protect the business, narrow the issue and choose a resolution path that makes sense relative to the risk, cost and likely recovery.
FREQUENTLY ASKED QUESTIONS
Business-dispute questions owners often ask
What is a business or commercial dispute?
It is a disagreement arising from business activity, such as a contract, invoice, partnership, shareholder relationship, supply arrangement, lease, sale, service agreement or commercial obligation.
Should every business dispute go to court?
No. Some disputes are better resolved through demand letters, negotiation, mediation, payment plans or structured settlements.
What evidence should I preserve?
Preserve contracts, invoices, emails, texts, delivery records, payment records, corporate documents, financial records and any documents showing loss or attempted resolution.
Can I sue for unpaid invoices?
Yes, unpaid invoices may support a debt or contract claim if the work, amount, agreement and non-payment can be proven.
Can a business dispute go to Small Claims Court?
Yes, Ontario Small Claims Court currently handles claims up to $35,000, not including interest and costs.
When does a business dispute belong in Superior Court?
Superior Court may be needed for larger claims, injunctions, complex commercial disputes, oppression claims, specific performance or claims above the Small Claims Court limit.
What is a demand letter?
A demand letter sets out the claim, evidence, amount requested, deadline and potential next steps if the dispute is not resolved.
What is an injunction?
An injunction is a court order requiring someone to do or stop doing something. It may be used where urgent harm cannot wait for a final trial.
How long do I have to sue in Ontario?
Ontario’s basic limitation period is generally two years from discovery of the claim, subject to the facts and applicable law.
Should I keep doing business with the other party during the dispute?
It depends. Continuing the relationship may preserve value, but it can also affect legal rights if done without reservation or clear terms.
What should a settlement include?
A settlement may address payment, timing, releases, confidentiality, return of property, future restrictions, default consequences and dismissal of proceedings.
When should I speak with a lawyer?
Legal advice is useful where the amount is significant, the dispute affects operations, urgent relief may be needed, limitation periods are approaching or the other side has threatened litigation.
OFFICIAL RESOURCES
Further reading
ABOUT THIS RESOURCE
Prepared by Tatyana Trusz, Trusz Law. This resource is for general information only and is not legal advice. Business disputes depend on the contract, evidence, damages, urgency, limitation periods, court forum and commercial objectives. Last reviewed July 2026.
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