A demand letter in Ontario is a written request asking another person or business to resolve a dispute, often before legal proceedings begin. It may request payment of an outstanding debt, compliance with a contract, compensation for a loss, or another specific action.
A demand letter can give both parties an opportunity to resolve a disagreement without going to court. It also sets out the sender’s position and explains what may happen if the matter remains unresolved. However, sending a demand letter does not guarantee payment, prove that a legal claim is valid, or automatically start a lawsuit. Whether you are considering sending one or have just received one, understanding its purpose can help you decide what to do next.
What Is a Demand Letter in Ontario?
A demand letter is a formal written communication explaining a dispute and requesting a specific resolution. For example, a business may send a demand letter to a customer who has not paid an invoice. A property owner may request compensation for damage, while one company may ask another to fulfill an outstanding contractual obligation.
A typical demand letter identifies:
- The parties involved and the nature of their relationship
- The relevant facts and events
- The agreement or legal basis supporting the demand
- The amount owed or action requested
- A proposed deadline for responding
- The next steps the sender may consider if the dispute is not resolved
The letter should be factual, clear, and proportionate to the issue. Ontario’s civil court guidance encourages parties to consider negotiation before starting legal proceedings. This can include writing to the other party, explaining the disagreement, and identifying what is being requested.
A well prepared demand letter creates an opportunity for that conversation before the parties incur the time and expense of litigation.
When Should You Send a Demand Letter?
A demand letter may be useful when there is an identifiable dispute, supporting evidence, and a reasonable basis for requesting payment or another remedy.
Common situations include:
| Situation | What a demand letter may request |
| Unpaid invoices or outstanding debts | Payment of a specified balance |
| Breach of contract | Compliance with an obligation or compensation for a loss |
| Unfinished or defective services | Completion of agreed work or an appropriate remedy |
| Property damage | Compensation for documented losses |
| Commercial lease disputes | Payment, compliance with lease terms, or another contractually available remedy |
| Business ownership disputes | Compliance with an agreement or a response to identified concerns |
For example, imagine an Ontario business completes a project worth $18,000. The customer receives the invoice but does not pay, despite several reminders.
Before starting a lawsuit, the business may send a formal demand setting out the agreed payment terms, invoice history, outstanding balance, and deadline for resolving the account. The customer may then pay, explain why the amount is disputed, or propose a settlement. The letter does not guarantee any of these outcomes, but it may help both parties establish what is actually in dispute.
When Might a Demand Letter Be the Wrong First Step?
Not every disagreement calls for an immediate legal demand. Sometimes the parties have misunderstood the agreement, an invoice contains an error, or a business relationship could be preserved through an ordinary discussion.
More importantly, some matters require urgent legal action, involve specific statutory notices, or have deadlines that make further correspondence risky. Before sending a letter, consider whether the issue requires negotiation, formal notice under an agreement, or a different legal process altogether.
Do You Have to Send a Demand Letter Before Filing a Lawsuit in Ontario?
No. Ontario does not impose a universal requirement to send a demand letter before starting every civil lawsuit. However, particular contracts or laws may require notice or other steps before a claim can proceed. For example, a commercial agreement may require written notice of a breach and an opportunity to correct it. Certain claims against government bodies can also involve specific statutory notice requirements.
An ordinary demand letter does not necessarily satisfy those requirements. Where no special notice obligation applies, a demand letter may still be worthwhile because it allows the recipient to respond before litigation begins.
The decision should consider the strength of the claim, available evidence, potential costs, time limits, and likelihood of a negotiated resolution. For a broader explanation of the legal process, see Rogers & Company’s guide to what civil litigation involves and when to hire a lawyer.
What Should an Ontario Demand Letter Include?
There is no single demand letter template in Ontario that works for every dispute. A letter concerning an unpaid invoice will differ from one involving breach of contract, property damage, or a commercial lease. However, an effective letter generally follows a straightforward structure.
1. Identify the Parties
Include the correct names of the sender and recipient. Where a business is involved, confirm the legal entity responsible under the contract rather than relying solely on a trade name.
2. Explain What Happened
Provide a concise summary of the relevant facts. Include dates, agreements, transactions, communications, and other details necessary to understand the dispute. Avoid unnecessary accusations or emotional language.
3. Explain the Basis of the Demand
Identify why the sender believes they are entitled to payment or another remedy. For an unpaid account, this may involve an agreement, invoices, and payment history.
For a contract dispute, the relevant obligations and alleged breach should be clearly identified.
4. State the Amount or Action Requested
Be specific about the proposed resolution. If the demand concerns money, explain how the amount was calculated. Any claimed interest, fees, or additional losses should have a proper contractual or legal basis. If the issue involves another obligation, explain what action is being requested.
5. Provide a Reasonable Response Deadline
State when the sender expects a response, taking into account the urgency and complexity of the issue. The proposed deadline should not be confused with a court imposed deadline.
6. Explain the Potential Next Steps
A demand letter may indicate that the sender will consider legal proceedings if the matter cannot be resolved.
Any statement about available legal remedies should be accurate. Threatening steps that are legally unavailable or making unsupported allegations can undermine the letter’s credibility.
7. Keep a Record of the Letter
Retain the final letter, supporting documents, and evidence showing when and how it was delivered. If the relevant contract specifies a method for delivering notices, those requirements should be reviewed and followed.
A useful demand letter explains the claim and proposed resolution clearly enough that the recipient can make an informed response.
How Long Does Someone Have to Respond to a Demand Letter in Ontario?
There is no universal legal deadline requiring someone to respond to an ordinary demand letter within a particular number of days.
A letter may request a response within seven, ten, or fourteen days, for example. That is generally a deadline proposed by the sender, not automatically a statutory requirement. However, a contractual notice provision or specific legislation may create different obligations.
The distinction matters because receiving a demand letter is not the same as being served with court documents. For example, someone served with a Plaintiff’s Claim in Ontario Small Claims Court generally has 20 days to serve and file a defence. That is a court-procedure deadline with potential consequences for failing to respond.
An ordinary demand letter does not automatically carry those same consequences. Nevertheless, ignoring a credible demand can create practical risks. The sender may decide to pursue formal legal action, and opportunities to resolve the dispute through negotiation may be lost.
What Should You Do if You Receive a Demand Letter?
Receiving a demand letter does not necessarily mean you have done something wrong or that the other party will succeed in court. It means someone is asserting a position and asking you to respond. Before agreeing to anything, consider the following steps.
Review the Allegations Carefully
Identify what the sender is requesting and why. Separate information you know to be accurate from allegations you dispute or cannot verify.
For example, a demand for unpaid services may involve an amount you agree is owed, alongside additional charges that are disputed.
Check the Supporting Documents
Review relevant contracts, invoices, emails, payment confirmations, and other available records. If the letter refers to an agreement or transaction you do not recognize, verify the sender’s identity and the underlying claim before providing information or making payment.
Avoid Making Unnecessary Admissions
A response may affect future negotiations or legal proceedings. Do not admit liability, promise payment, or agree to terms without understanding the consequences.
Equally, an aggressive response based on assumptions can make a manageable dispute more difficult.
Consider Whether the Matter Can Be Resolved
Depending on the circumstances, an appropriate response may involve payment, disputing the claim, requesting clarification, or proposing a negotiated settlement.
If the amount or legal basis is significant or unclear, a civil litigation lawyer can assess the demand before a formal response is sent.
What Happens if Someone Ignores a Demand Letter?
If the recipient does not respond, the sender must decide whether further action is worthwhile.
Possible next steps include additional correspondence, negotiation, mediation, or commencing legal proceedings. There is no automatic judgment or legal penalty simply because someone failed to answer an ordinary demand letter.
Can You Sue After Sending a Demand Letter?
Potentially, if there is a legally supportable claim and the applicable requirements are satisfied. For eligible civil claims in Ontario, the appropriate court depends partly on the value and nature of the remedy being sought.
As of October 2026, Ontario Small Claims Court generally handles monetary claims and claims for the return of personal property valued at $50,000 or less. Claims exceeding that amount generally proceed in the Superior Court of Justice, although a claimant may choose to waive an amount above the Small Claims Court limit in appropriate circumstances.
Some disputes require particular court procedures or remedies regardless of their monetary value. The important distinction is that a demand letter may precede a lawsuit, but it does not replace the process of properly filing and serving a claim.
Rogers & Company’s civil litigation services include breach-of-contract disputes, debt recovery, commercial disagreements, and representation in Ontario court proceedings.
Does Sending a Demand Letter Stop the Limitation Period?
Generally, sending a demand letter does not, by itself, pause the time available to start a lawsuit.
Under Ontario’s Limitations Act, 2002, the basic limitation period for many civil claims is two years from when the claim was discovered. However, the legal analysis depends on the type of claim and the circumstances.
For example, the Act contains specific rules concerning obligations payable on demand. It also provides for the suspension of certain limitation periods when parties agree to have an independent third party resolve or assist in resolving a claim.
These exceptions should not be confused with simply mailing a demand letter or beginning informal negotiations. If a claim is approaching a potential limitation deadline, legal advice should be obtained promptly. Waiting for a response could jeopardize the ability to commence proceedings.
Need Help With a Demand Letter in Ontario?
A demand letter can be a useful first step in resolving a business or civil dispute, but its value depends on the strength of the claim, the evidence, and the approach taken.
Whether you need to recover an unpaid debt, respond to a contractual demand, or decide if litigation is necessary, understanding your legal position before acting can help prevent unnecessary complications.
Rogers & Company assists individuals and businesses with civil litigation matters,