Breach of Contract Lawyer
Contract Disputes for Businesses, Owners, Contractors and Professionals
A contract dispute can put money, operations, business relationships and future opportunities at risk. When one side fails to perform, refuses to pay, walks away from a deal, delivers defective work, breaches confidentiality, or interferes with an agreement, the legal and financial consequences can escalate quickly.
Vanguard Law represents Ontario businesses, shareholders, directors, contractors, professionals and business owners in breach of contract disputes. As part of our Corporate Litigation practice, we help clients assess their rights, preserve evidence, respond strategically and pursue practical resolutions through negotiation, demand letters, settlement discussions or litigation where necessary.
We assist with contract disputes involving service agreements, vendor agreements, shareholder and partnership agreements, purchase and sale agreements, consulting agreements, employment-related business agreements, commercial leases, unpaid invoices, failed transactions and urgent disputes that may require injunctions.
When a Contract Dispute Becomes a Legal Problem
Not every disagreement is a lawsuit. Businesses often deal with delays, misunderstandings, imperfect performance and payment issues. A breach of contract dispute becomes more serious when the other party’s conduct causes financial loss, threatens business operations, damages a commercial relationship or creates uncertainty about what happens next.
Common breach of contract disputes include:
Non-payment for goods or services;
Unpaid invoices and outstanding corporate debts;
Failure to deliver goods, services or work as promised;
Defective or incomplete work;
Missed deadlines or failed performance milestones;
Termination of a contract without proper notice or legal justification;
Disputes over renewal, cancellation or payment terms;
Breach of shareholder, partnership or business owner agreements;
Breach of confidentiality, non-solicitation or restrictive covenant obligations;
Failure to close a real estate transaction;
Misrepresentation before or during a business agreement;
Refusal to honour settlement terms; and
Disputes over damages, lost profits, deposits, holdbacks or set-off claims.
Where the dispute is mainly about unpaid money, our Corporate Debt Recovery page may be more directly relevant. Where the dispute involves shareholders, partners, directors or co-founders, visit our Business Owner Disputes page.
What You May Need to Prove in a Breach of Contract Claim
A breach of contract claim usually starts with the agreement itself. That agreement may be a formal written contract, a purchase order, an email exchange, a signed proposal, a shareholder agreement, a settlement agreement, or another document showing what the parties agreed to.
Important questions often include:
Was there a valid agreement?
What did each side promise to do?
Were the terms clear enough to enforce?
Did one party fail to perform an obligation?
Was the breach serious or technical?
Did the non-breaching party also meet its obligations?
What losses flowed from the breach?
Were reasonable steps taken to reduce the loss?
Is there a deadline to bring a claim?
Are there defences such as set-off, frustration, misrepresentation, waiver or failure to mitigate?
Vanguard Law helps clients review the contract, communications, invoices, payment records, performance history and surrounding facts to identify the strongest path forward.
Breach of Contract Claims We Handle
Service Agreement Disputes
Service agreement disputes often arise when one side says the work was not completed, was completed poorly, was delayed, or was not paid for. These disputes may involve contractors, consultants, agencies, suppliers, professional service providers, trades, technology vendors or recurring business relationships.
We help clients assess the contract terms, scope of work, invoices, change orders, communications and performance history to determine whether there was a breach and what remedies may be available.
Unpaid Invoices and Payment Disputes
A business may be owed money under a contract but still face delay tactics, excuses, partial payments or outright refusal to pay. In those cases, the strategy may involve a demand letter, negotiation, settlement proposal, litigation or enforcement steps.
If your primary issue is collecting money owed to your business, see our page on Corporate Debt Recovery.
Shareholder, Partnership and Business Owner Agreements
Contract disputes can become more complex when the contract is tied to ownership or control of a business. A shareholder, partner, director or co-founder may be accused of breaching a shareholder agreement, partnership agreement, buy-sell provision, confidentiality obligation, non-solicitation clause or exit arrangement.
These disputes often overlap with Business Owner Disputes, Director and Officer Liability, and claims involving breach of fiduciary duty, misuse of company funds or unfair treatment of minority shareholders.
Failed Transactions and Real Estate Disputes
Some breach of contract claims involve failed closings, disputed deposits, failure to complete a purchase, refusal to honour conditions or disagreements over what a party was required to do before closing.
Where the contract relates to land, commercial property, leases, deposits or failed real estate transactions, visit our Real Estate Disputes page.
Confidentiality, Non-Solicitation and Restrictive Covenant Disputes
Some contracts are breached not by failing to pay, but by misusing information, soliciting clients, diverting business, competing unfairly or ignoring restrictions after a business relationship ends.
These cases may require fast action, especially where confidential information, client relationships or business opportunities are at risk. In urgent cases, legal options may include an injunction to prevent further harm.
Misrepresentation and Business Interference
Some contract disputes involve more than a broken promise. There may be allegations that one party misled the other, interfered with a business relationship, induced another party to breach a contract or caused commercial harm through wrongful conduct.
Where the dispute involves intentional interference, deceit, conspiracy, intimidation or harm to business relationships, see our page on Business & Economic Torts.
Remedies in a Breach of Contract Dispute
The right remedy depends on the contract, the breach, the loss, the urgency and the business objective. In many cases, the goal is not simply to “sue.” The goal is to recover money, protect leverage, preserve a relationship where possible, or bring the dispute to an efficient commercial resolution.
Possible remedies may include:
Payment of outstanding amounts;
Damages for financial loss;
Lost profits, where legally available and provable;
Return of deposits or funds paid;
Specific performance in appropriate cases;
Injunctive relief to stop ongoing harm;
Enforcement of settlement agreements;
Accounting or tracing of funds;
Negotiated payment plans;
Releases and settlement documentation; and
Litigation in Small Claims Court or the Superior Court of Justice, depending on the claim.
Vanguard Law helps clients evaluate not only what they may be legally entitled to, but also what is practical, collectible and commercially worthwhile.
Defending a Breach of Contract Claim
We also assist clients who are accused of breaching a contract. A claim may be overstated, incomplete or missing important context. The other party may have failed to perform first, changed the agreement, accepted different performance, failed to mitigate losses or claimed damages that are speculative or unsupported.
Possible defence issues may include:
No enforceable contract;
Unclear or ambiguous terms;
The other party breached first;
Payment was not yet due;
Work was deficient or incomplete;
The contract was changed by later agreement;
Waiver or acceptance of performance;
Set-off for amounts owed back;
Misrepresentation;
Frustration of contract;
Lack of authority to bind the company;
Failure to prove damages; or
Failure to take reasonable steps to reduce the loss.
If the contract dispute overlaps with employment, termination, executive compensation or restrictive covenants, Vanguard Law can also advise on related employer-side risks through our Wrongful Dismissal Defence and Workplace Counsel+™ services.
Why Early Legal Advice Matters
Contract disputes reward early strategy. Before sending an aggressive email, withholding payment, terminating an agreement, contacting customers, locking someone out of systems, or threatening litigation, it is important to understand the risks.
Early advice can help you:
Identify the strongest legal position;
Avoid accidentally weakening your claim;
Preserve key documents and communications;
Understand limitation-period risks;
Decide whether to negotiate, demand payment or litigate;
Assess whether urgent relief is needed;
Avoid unnecessary escalation; and
Build a record that supports your position if the dispute proceeds.
In many cases, the first letter or response sets the tone for the entire dispute. Vanguard Law helps clients move early, clearly and strategically.
Our Approach to Breach of Contract Disputes
Vanguard Law takes a practical, evidence-driven approach to contract disputes. We focus on the documents, the business context, the financial stakes and the client’s end goal.
1. Review the Contract and Key Documents
We review the agreement, invoices, emails, payment history, performance records, termination notices, text messages, corporate records and any other documents that explain what happened.
2. Assess Rights, Risks and Leverage
We identify the legal issues, the likely arguments on both sides, the available remedies, potential defences, limitation-period concerns and practical risks.
3. Build a Strategy
Depending on the case, the next step may be a demand letter, negotiation, urgent court action, a repayment proposal, settlement discussions, mediation or litigation.
4. Move Decisively
Some disputes can be resolved quickly. Others require firm litigation steps. Vanguard Law helps clients choose the path that best matches the risk, the cost and the commercial objective.
Speak With a Breach of Contract Lawyer
If a contract has been broken, payment is being withheld, a business agreement has collapsed, or you are being accused of breaching a contract, early legal advice can help you protect your position.
Vanguard Law helps Ontario businesses, owners, contractors, shareholders, directors and professionals resolve breach of contract disputes with clear strategy and practical advocacy.
FAQ Section
What is a breach of contract?
A breach of contract occurs when one party fails to do something required by an agreement. This may involve non-payment, incomplete performance, defective work, missed deadlines, unauthorized termination, failure to close a transaction or breach of confidentiality or restrictive obligations.
Do I need a written contract to bring a breach of contract claim?
Not always. Written contracts are usually easier to prove, but agreements may also be supported by emails, invoices, purchase orders, text messages, conduct, payment history or other evidence. The strength of the claim depends on whether the agreement and its key terms can be proven.
What damages can be claimed for breach of contract?
Damages depend on the contract and the loss. They may include unpaid amounts, direct financial losses, lost profits, replacement costs, wasted expenses or other losses caused by the breach. The damages must be legally recoverable and supported by evidence.
Can I sue for unpaid invoices?
Yes, unpaid invoices may form the basis of a breach of contract or debt claim. Depending on the facts, the first step may be a demand letter, negotiation, settlement proposal or legal proceeding. For payment-focused disputes, see Corporate Debt Recovery.
What if the other party says I breached the contract first?
That may become an important defence or counterclaim. Many contract disputes involve competing allegations about who failed to perform, whether payment was due, whether work was deficient, and whether either side accepted or waived certain conduct.
Can a breach of contract case be urgent?
Yes. Some contract disputes require fast action, especially where confidential information, business assets, customers, real estate transactions, corporate control or ongoing harm are involved. In urgent cases, an injunction may be considered.
How long do I have to sue for breach of contract in Ontario?
Limitation periods are fact-specific, but many civil claims in Ontario are subject to a two-year basic limitation period from when the claim is discovered. You should get legal advice promptly because missing a deadline can seriously affect your rights.
Does Vanguard Law handle business owner contract disputes?
Yes. Vanguard Law assists with disputes involving shareholder agreements, partnership agreements, buy-sell provisions, ownership exits, business deadlock and related corporate litigation. Visit Business Owner Disputes for more information.