a demand letter explained

Demand Letters in Commercial Disputes: What They Are, When to Send One, and How to Respond

Date: June 8, 2026

A dispute has arisen. You are owed money, a contract has been breached, or another party is not meeting their obligations. Before commencing court proceedings, there is a practical and often decisive first step available to you: a demand letter. Used correctly, a demand letter can resolve a commercial dispute faster and at lower cost than litigation. Used incorrectly, it can weaken your position or leave you exposed.

This article explains what a demand letter is, when to use one, what it should contain, how to respond if you receive one, and when to involve a commercial litigation lawyer.

What is a demand letter?
A demand letter is a formal written notice setting out a legal claim, the factual basis for it, the remedy being sought, and a deadline for compliance. It is typically the first formal step in a commercial dispute before court proceedings begin.

Courts treat demand letters as evidence of good faith and as proof that the other party had notice and a reasonable opportunity to resolve the matter. A well-drafted demand letter can trigger settlement negotiations, preserve your legal position, and demonstrate that you are serious about pursuing the claim if necessary.

Why demand letters matter in commercial disputes

The primary purpose of a demand letter is to resolve disputes before they escalate into litigation. By setting out your position clearly and giving the other party an opportunity to respond, a demand letter creates the conditions for negotiation and settlement without the cost and delay of court proceedings.

Beyond their practical value, demand letters carry legal significance. Courts view them as evidence that the sender made a genuine effort to resolve the matter before resorting to litigation. Where a dispute proceeds to trial, a demand letter can strengthen your position by demonstrating that the other party was given fair notice, understood what was being claimed, and chose not to remedy the situation.

Demand letters also serve important practical functions: they create a clear written record of the dispute, trigger contractual deadlines and notice requirements, signal to the other party that you have obtained legal advice, and sometimes prompt the payment of claims that had simply been ignored or deprioritized.

When to send a demand letter

A demand letter is most effective when you have a clear legal claim, a defined remedy you are seeking, and a genuine intention to pursue court proceedings if the other party does not comply. Common commercial situations where demand letters are appropriate include:

  • Unpaid invoices, outstanding debts, or refused loan repayments
  • Breach of a commercial contract or service agreement
  • Failure to perform contractual obligations by the agreed deadline
  • Misrepresentation or fraudulent conduct in a commercial transaction
  • Intellectual property violations including unauthorized use of confidential information
  • Shareholder or partnership disputes where a formal demand is needed to trigger the dispute resolution process
  • Situations where a written demand is required before court proceedings can commence under a contract or statute
In some commercial contracts and under certain Ontario statutes, written notice is a legal prerequisite before you can commence court proceedings. Always check whether your specific contract or the applicable legislation requires prior notice before assuming you can sue immediately. Missing a contractual notice requirement can affect your rights.

What a demand letter should include

The effectiveness of a demand letter depends as much on what it contains as on whether it is sent at all. A letter that is vague, legally imprecise, or emotionally charged can weaken your position rather than strengthen it.

Clear statement of the claim Identify the legal basis for your claim precisely: breach of contract, unpaid debt, misrepresentation, or the specific obligation that has not been met. Vague or general allegations invite dispute rather than resolution.
The material facts Set out the relevant facts in chronological order, referenced to supporting documents where possible. The facts should be accurate, complete, and focused on what is legally relevant to the claim.
The specific remedy sought State exactly what you want: payment of a specific dollar amount, performance of a specific obligation, or cessation of specific conduct. A demand for an unspecified remedy is not a demand at all.
A reasonable deadline Set a clear and reasonable deadline for compliance. The appropriate timeframe depends on the nature of the claim: payment of an outstanding invoice may warrant 14 days, while a complex performance obligation may require more. Unreasonably short deadlines undermine the good faith the letter is meant to demonstrate.
Consequences of non-compliance State clearly what steps you will take if the demand is not met by the deadline, whether that is commencing court proceedings, seeking an injunction, or reporting the matter to a regulatory body. The consequences must be ones you are genuinely prepared to follow through on.
Professional tone throughout Demand letters may be reviewed by a judge. Aggressive, hostile, or emotionally charged language is counterproductive and can be used to portray the sender as unreasonable. State the facts and the claim clearly and let the legal position speak for itself.

Sending vs receiving: two different positions

If you are sending a demand letter

  • Have a lawyer review the legal basis for your claim before sending
  • Ensure the facts stated are accurate and provable
  • Set a deadline that is reasonable given the nature of the demand
  • Be prepared to follow through on the stated consequences
  • Keep a record of how and when the letter was delivered
  • Do not send a demand letter as a bluff if you are not prepared to litigate

If you have received a demand letter

  • Read it carefully and do not ignore it
  • Seek legal advice before responding
  • Do not respond emotionally or admit liability without advice
  • Gather documents that support your position before the deadline
  • Respond professionally and within the stated timeframe
  • Use the response as an opportunity to open settlement discussions

How to respond to a demand letter

Receiving a demand letter can feel alarming, but it is important to respond carefully rather than react immediately. Ignoring a demand letter rarely makes the situation better and can be used against you in subsequent proceedings as evidence that you had notice and chose not to engage.

Seek legal advice before responding

A demand letter is a legal document. How you respond, what you admit, and what you dispute can affect your position in any subsequent litigation. Before putting anything in writing, have a lawyer assess the validity of the claims being made and advise on the appropriate response strategy.

Assess the merits of the claim

Not every demand letter represents a valid legal claim. Review the letter against your records, the relevant contracts, and the applicable law. Some claims are overstated, some are based on incorrect facts, and some have no legal foundation at all. Understanding where the other side's claim is weak informs both your response and your negotiating position.

Respond in writing, professionally

Your response should address each claim made in the demand letter, attach any documents that support your position or refute the allegations, and be written in a professional tone. Avoid admitting liability, making partial concessions without advice, or making threats that could escalate the dispute unnecessarily.

Use the response to open negotiations

A demand letter is an opening position, not necessarily a final one. If the underlying dispute has a reasonable settlement range, your response can acknowledge the existence of a disagreement while proposing a process for resolution. Many commercial disputes that begin with demand letters are resolved through negotiation without ever reaching court.

Received a demand letter and unsure how to respond?

What you say in response to a demand letter, and how quickly you say it, can significantly affect your legal position. Do not respond without legal advice, and do not ignore the deadline. Achkar Law can assess the validity of the claims and advise you on the right response strategy.

Call: 1-800-771-7882 Speak With a Litigation Lawyer

When a lawyer-drafted demand letter makes a difference

While anyone can write a demand letter, a letter drafted by a commercial litigation lawyer carries meaningfully greater weight in most circumstances. It signals that the sender has obtained legal advice and reviewed the legal basis for the claim, is serious about pursuing the matter if necessary, and has had the facts and legal position reviewed before asserting them formally.

For significant commercial claims, having a lawyer draft the demand letter is almost always worth the cost. The precision of the legal claim, the identification of the applicable contractual provisions or statutory rights, and the clear articulation of consequences all make the letter more credible and more likely to produce a response.

A lawyer can also advise on whether sending a demand letter is the right first step at all. In some disputes, a well-timed phone call produces faster results. In others, proceeding directly to court without a demand letter is the right strategy. The decision depends on the facts, the relationship between the parties, and the urgency of the situation.

Need a demand letter drafted or advice on how to respond to one?

Achkar Law represents businesses, organizations, and individuals across Ontario and British Columbia in commercial disputes, from demand letters and pre-litigation strategy through to injunctions and trial.

Speak With a Commercial Litigator Or call us: 1-800-771-7882

Demand letters in British Columbia

The same principles apply in BC commercial disputes. Demand letters are not generally required by law before commencing proceedings in BC Supreme Court, but they serve the same practical and evidentiary functions as in Ontario. BC courts similarly view pre-litigation correspondence as evidence of the parties' positions and their willingness to resolve disputes before resorting to litigation.

As in Ontario, some BC commercial contracts and statutes require prior written notice before certain claims can be pursued. If you are involved in a BC commercial dispute, review your contract carefully and obtain legal advice on any notice requirements before sending or responding to a demand letter.

Practical takeaways

A demand letter is the first formal step in most commercial disputes. It sets out your claim, the facts, the remedy sought, and a deadline for compliance.
Courts treat demand letters as evidence of good faith. A well-drafted letter demonstrates that the other party had notice and an opportunity to resolve the matter before litigation began.
A lawyer-drafted demand letter carries significantly more weight than one drafted by the party alone. For substantial claims, the cost of legal drafting is consistently worth it.
Do not ignore a demand letter. Failing to respond can be used against you in subsequent proceedings and rarely improves your position.
Some contracts and statutes require written notice before you can commence court proceedings. Check your contract and the applicable law before assuming you can sue without prior notice.
A demand letter is an opening position, not the end of the road. Many commercial disputes that begin with demand letters are resolved through negotiation without reaching court.

Frequently asked questions

What is a demand letter in a commercial dispute?

A demand letter is a formal written notice setting out a legal claim, the factual basis for it, the remedy being sought, and a deadline for compliance. It is typically the first formal step in a commercial dispute before court proceedings are commenced. Courts treat demand letters as evidence of good faith and proof that the other party had notice and an opportunity to resolve the matter.

When should you send a demand letter?

A demand letter is appropriate when you have a clear legal claim, a defined remedy you are seeking, and a genuine intention to pursue court proceedings if the other party does not comply. Common situations include unpaid invoices, breach of contract, debt recovery, and enforcement of contractual obligations. Some contracts also require a formal written demand before litigation can be commenced.

Is a demand letter legally required before suing in Ontario?

In most commercial disputes, a demand letter is not legally required before commencing court proceedings. However, some specific contracts and statutes do require prior written notice. Courts also view demand letters favourably as evidence of good faith. Always check whether your specific contract or the applicable legislation imposes a notice requirement before commencing proceedings.

What should a demand letter include?

A demand letter should include: a clear statement of the legal basis for the claim; the relevant facts referenced to supporting documents; the specific remedy being sought; a reasonable deadline for compliance; and a clear statement of what steps will be taken if the demand is not met. It should be professional in tone throughout, as it may later be reviewed by a court.

How should you respond to a demand letter?

Seek legal advice before responding. Review the letter carefully against your records and the relevant contracts. Respond in writing, address each claim made, attach supporting documents, and maintain a professional tone. Do not admit liability without legal advice. Use the response as an opportunity to open settlement discussions where appropriate. Ignoring a demand letter is almost never the right strategy.

Does a demand letter from a lawyer carry more weight?

Generally yes. A lawyer-drafted demand letter signals that the sender has obtained legal advice, reviewed the legal basis for the claim, and is serious about pursuing it. It typically demonstrates greater precision in identifying the applicable legal provisions and the consequences of non-compliance. For significant commercial claims, having a lawyer draft the demand letter is almost always worth the cost.

Need a demand letter drafted or advice on responding to one?

Whether you are sending a demand letter or have received one, Achkar Law can help. We represent businesses, organizations, and individuals across Ontario and British Columbia in commercial disputes, from pre-litigation strategy and demand letters through to court proceedings and enforcement.

Call us at 1-800-771-7882 or fill out the form below and we will be in touch.