Cease and Desist Letter in Canada: How It Works (2026)

A cease and desist letter is a private, written demand that someone stop doing something that harms your business, such as copying your brand or breaching a contract. It is not a court order. In Quebec, the same letter is a formal notice under the Civil Code, which gives it extra legal effects.

Rules checked on October 27, 2026 with the Canadian Intellectual Property Office, the Civil Code of Québec, the Code of Civil Procedure and Québec.ca. This article is general information, not legal advice on your situation.

What is a cease and desist letter?

A cease and desist letter asks a person or business to stop a specific activity by a deadline and warns that legal action may follow if they do not. The Canadian Intellectual Property Office describes it as a letter to an infringing party asking them to stop, sent before any court proceedings begin.

The name comes from the two things you ask for: cease the activity now and desist from doing it again. Businesses use these letters for trademark and copyright disputes, broken non-compete or confidentiality clauses, misleading statements about their products and, more loosely, for unpaid invoices. Strictly speaking, a letter that asks for payment is a demand letter, but the structure is the same.

Anyone can write one, and Québec.ca confirms that a lawyer is optional for a formal notice. What matters most is that the letter is accurate, specific and sent in a way you can prove later.

Is a cease and desist letter legally binding in Canada?

No. A cease and desist letter is a demand, not a judgment, so it cannot force anyone to stop. Its value lies in what it proves later: that the other side knew about your rights, was told what to stop and was given a fair deadline. Courts can take that into account.

Québec.ca says the same about formal notices: nothing forces the recipient to respond or comply, and sending one does not oblige you to sue. In Quebec, however, the letter has legal effects of its own. Under article 1594 of the Civil Code, an extrajudicial demand puts the other party "in default", and article 1595 requires it to be in writing with sufficient time to perform.

Being in default matters. For a debt, interest runs from the date of default at the contract rate or, if none was agreed, at the legal rate, without any need to prove a loss (art. 1617). The federal Interest Act sets that rate at 5% a year when no rate is fixed. And if you sue without putting the debtor in default first, and they pay within a reasonable time, article 1596 makes you bear the costs of the lawsuit.

What should a cease and desist letter include?

A cease and desist letter should name the sender and the recipient, give the date, describe the activity precisely enough for the recipient to understand what must stop and why, and set a deadline before legal action. These are the elements the Canadian Intellectual Property Office lists for intellectual property letters.

Québec.ca adds a few items that matter if the case ends up in a Quebec court. The table combines both lists.

Keep the tone firm and factual. The intellectual property office warns that a letter can be direct, curt, conciliatory or friendly, but it should avoid bald threats, threats against third parties and false statements. Even an unproven conclusion of law, such as declaring that someone "is infringing" before a court has said so, can be treated as false.

What grounds do you need for a cease and desist?

You need a legal right that the other party is breaching: a contract term, a registered trademark, a copyright, a confidentiality obligation or a debt that is due. A letter without a real right behind it is a bluff, and the recipient's lawyer will usually spot it. Gather the evidence before you write.

For small and growing businesses, the same few situations come up again and again. The table matches each one to what you would point to in the letter.

Your position is much stronger when the right is on paper. A registered trademark is easier to enforce than an unregistered name, and a signed non-disclosure agreement gives you a clear clause to quote instead of a general argument about fairness.

Cease and desist, demand letter or formal notice: what is the difference?

All three are written demands sent before going to court. A cease and desist asks someone to stop an activity, a demand letter asks for payment or performance, and a formal notice is the Quebec civil law term that covers both. In Quebec, any of them can put the other party in default under the Civil Code.

The difference is mostly about vocabulary outside Quebec. Inside Quebec, using the words "formal notice" or "mise en demeure" in the body of the letter is recommended by Québec.ca so the recipient understands what it is.

How do you send a cease and desist letter?

Send it in a way that proves the recipient received it. The intellectual property office lists registered or certified mail, courier, fax and email as acceptable, noting that email receipt is harder to prove. Québec.ca recommends registered mail or a bailiff, and keeping the proof of delivery and a copy of the letter.

Many businesses send the letter by email and registered mail on the same day: the email gets attention, the registered mail gets proof. Do not copy third parties such as the recipient's clients, landlord or platform. That is one of the intellectual property office's explicit warnings, and it can turn your complaint into a new dispute about your own conduct.

Set a realistic deadline. Ten days works for most payment or takedown demands. Rebranding a store or recalling packaging can take longer, and a deadline the recipient cannot meet weakens your position. Under article 1595, if the time given is not sufficient, the debtor can still perform within a reasonable time.

Can you provide an example of a cease and desist letter?

Here is a sample for a business that finds a competitor using a confusingly similar name. It follows the elements recommended by the Canadian Intellectual Property Office and Québec.ca: parties, date, facts, a precise demand, a deadline and the consequence. Replace the bracketed text and remove anything that does not apply to your situation.

[City], [date]

WITHOUT PREJUDICE
BY REGISTERED MAIL AND EMAIL

[Recipient's legal name]
[Address]

Re: Cease and desist, use of the name [name]

Dear Sir or Madam,

[Your business's legal name] has used the trademark [mark] for [products or services] since [year]. It is registered with the Canadian Intellectual Property Office under number [registration number]. Since [date], your business has used the name [name] for [similar products or services], including on [website, social media accounts, signage].

This use is likely to cause confusion with our mark. We therefore demand that you stop using the name [name] and remove it from [list of places] within 10 days of receiving this letter, and confirm in writing that you have done so.

If you do not, we may take legal action without further notice. We remain open to discussing a solution before that date.

[Name, title, business name, phone, email, signature]

For an unpaid invoice, keep the same structure but replace the middle paragraphs with the invoice number, amount, due date and your earlier reminders, and demand payment with interest. In Quebec, add the words "formal notice" in the body of the letter.

What happens if someone ignores a cease and desist letter?

Nothing happens automatically. If the deadline passes, you choose between following up, negotiating, mediation or filing a claim. The letter becomes evidence in that claim: it shows the date the recipient was told, what they were told and how long they had. Sending it never obliges you to sue.

For money claims in Quebec, small claims court is often the cheapest route, but the Code of Civil Procedure limits who can use it. These rules surprise many business owners.

Watch the clock as well. The general prescription period in Quebec is three years (art. 2925). It is interrupted by filing a court application served in time (art. 2892) or by the debtor acknowledging the debt (art. 2898), not by a letter. Other provinces set their own limitation periods and small claims limits, so check the rules where the dispute will be heard.

What should you do if you receive a cease and desist letter?

Do not ignore it, and do not answer in anger. Check the facts, the right being claimed and the deadline, then decide: comply if the claim is valid, negotiate if it is partly valid, or reply in writing to contest it. Get legal advice before admitting anything, because an acknowledgement can be used against you.

Start by checking whether the sender actually holds the right. Search the trademark register, reread the contract the letter quotes and look at the dates. A letter that relies on a trademark registered after you started using your name, or on a clause that was never signed, is a very different problem from one backed by a clear registration.

A written reply, even a short one, shows good faith and fixes your version of the facts. The intellectual property office also points out that a licensing agreement can resolve an IP dispute, so a counter-proposal is sometimes better than a flat refusal. In Quebec, be careful with wording: acknowledging a debt interrupts prescription (art. 2898).

Frequently asked questions about cease and desist letters

Can I write a cease and desist letter myself?

Yes. Québec.ca confirms that you can write a formal notice yourself, even for a case headed to small claims. A lawyer adds weight and helps avoid statements that could expose you. For trademark or defamation disputes, legal review before sending is worth the cost.

Can I send a cease and desist letter by email?

Yes. The Canadian Intellectual Property Office lists email as an acceptable method, alongside registered mail, courier and fax. The weakness is proof: an email receipt is harder to establish than a registered mail delivery record. For anything that may go to court, send the same letter by registered mail or bailiff on the same day.

How much does a cease and desist letter cost?

If you write it yourself, the cost is mostly delivery, such as registered mail. A bailiff charges for service and a lawyer charges for drafting according to their own fees, so ask for a quote first. For a simple unpaid invoice, writing it yourself is common. For trademark or defamation issues, legal review is usually money well spent.

Can you get in trouble for sending a cease and desist letter?

Yes, if the letter is abusive, defamatory or makes false statements. The intellectual property office warns that the sender can be held liable in those cases, and that threats against third parties may be actionable. Stick to verifiable facts, make one clear demand and do not copy the recipient's clients or partners.

How long should a cease and desist deadline be?

Ten days is the usual deadline for a payment or a simple stop request, and Québec.ca describes 10 days as normally reasonable for a formal notice. Give more time when compliance takes real work, such as rebranding or withdrawing products. Under the Civil Code, a deadline that is too short still leaves a reasonable time to perform.

Does a cease and desist letter stop the limitation period?

Not in Quebec. The three-year prescription period is interrupted by filing a court application that is served in time, or by the debtor acknowledging the debt, under articles 2892 and 2898 of the Civil Code. A letter alone does neither. If the deadline to sue is close, talk to a lawyer before relying on correspondence.

Prevent the next dispute in your contracts

Most cease and desist and demand letters trace back to a gap in a contract: no due date, no interest on late payments, vague deliverables or no confidentiality clause. A clear service contract fixes those points before the first project starts. Need to send a letter or answer one? Talk to our team.