Cease-and-desist letters in Canada: what they are, when to use one, and the risks of bluffing

What a cease-and-desist letter is — and what it isn't

A cease-and-desist letter is a written notice from one person or business to another. In its simplest form it says three things: here is what you are doing, here is why it is wrong, and here is what will happen if you do not stop. It is also sometimes called a demand letter, and the two overlap heavily — a cease-and-desist letter is really a demand letter whose demand is that conduct stop, rather than that money be paid.

What it is not matters just as much, because the confusion causes most of the mistakes on both sides. It is not a court order: no judge has reviewed it, it carries no penalty for disobedience, and it does not create legal rights that did not already exist. It does not establish liability — sending a letter claiming someone infringed your trademark does not prove they did. It is not filed with any court or government office, and there is no official registry of cease-and-desist letters in Canada. And it is not a substitute for legal advice: a letter that cites the wrong law, or demands something you have no right to demand, is worse than no letter at all.

What it is, then, is a tool with two real powers. The first is psychological and practical: a clear, specific, dated letter tells the recipient that the sender is organized, has kept records, and is prepared to escalate — and for businesses, landlords, ex-partners, and infringers who did not realize the risk, that is often enough. The second is evidentiary: if the dispute does reach court, the letter becomes exhibit one. It proves the recipient was told, in writing, exactly what the problem was and when — and that they continued anyway. Judges notice that.

When to use one: the disputes where it works best

Cease-and-desist letters work best against rational actors with something to lose, where the conduct is clear and the fix is simple. The classic Canadian use cases:

• Harassment and unwanted contact: a former partner, ex-employee, or neighbour who will not stop calling, showing up, or messaging — where the conduct is persistent but has not yet crossed into threats of violence (see the safety section below for when to skip the letter and go straight to police)
• Intellectual property infringement: someone using your copyrighted photos, text, or video; selling products under your trademark; or copying your business name in a way that confuses customers. Identify the work or mark, the infringing use, and the URLs or locations
• Defamation: false statements published online or repeated to third parties that harm your reputation or business — the letter should quote the exact statements and explain, factually, why they are false
• Breach of contract or confidentiality: a former employee or contractor disclosing confidential information, soliciting your clients in breach of a non-solicitation clause, or a business partner using shared assets after the relationship ended
• Unfair competition and impersonation: fake social media accounts, misleading advertising that trades on your name, or a competitor passing itself off as you
• Debt-collection conduct: telling a collection agency to contact you only in writing, or to stop contacting you at work — a narrower, regulated use where the letter works alongside consumer-protection rules rather than replacing them

The common thread: the recipient can fix the problem by stopping, and stopping is cheaper for them than fighting. When both of those are true, a letter has a real chance. When either is false, the letter is just paper — and you should plan accordingly.

When not to use one

There are situations where sending a cease-and-desist letter is the wrong move, or where it must not be your first move:

• You feel unsafe: if someone is threatening violence, stalking you, or making you fear for your safety, do not rely on a letter. Contact police, keep a dated log of every incident, and consider a peace bond under section 810 of the Criminal Code or a restraining order through family court where it applies. A letter can accompany those steps, but it must never delay them
• The matter is already in court or before a tribunal: once a claim is filed, communicate through the proceeding and through lawyers, not through fresh demand letters — parallel letters can complicate the case and annoy the adjudicator
• You cannot prove the underlying claim: if you are not sure the other side actually infringed your rights, or your facts are shaky, a letter that asserts those facts as certain can itself become a problem — including a defamation risk if the statements about the recipient are false
• The demand is really about money: if what you mainly want is payment of a debt or damages, a demand letter framed around payment is the right tool, not a cease-and-desist letter dressed up as one — and mixing the two muddies both
• You are trying to silence legitimate criticism: a letter aimed at shutting down an honest review, a journalist, or someone raising a genuine public concern can backfire badly in Ontario, where section 137.1 of the Courts of Justice Act allows anti-SLAPP motions against proceedings brought to stifle public participation — and the letter itself can become evidence of that motive

If any of these apply, pause. A letter sent in anger, or sent before the facts are checked, is very hard to unsend — and the recipient may keep it forever.

What the letter must include: the seven elements

There is no prescribed form, but an effective Canadian cease-and-desist letter contains the same seven elements every time. Leave one out and the letter gets weaker; get one wrong and it can hurt you.

• Identification — your full name and contact details, and the recipient's full name and address. A letter addressed to a business name alone, with no person identified, is easy to shrug off; a letter naming the decision-maker is harder to ignore
• A precise description of the conduct — what happened, on which dates, where, and in what words. Quote the defamatory post, list the infringing URLs, name the dates of the unwanted contact. Vague accusations ('you have been harassing me and damaging my business') are ignorable; specifics are not
• The legal basis — the right infringed, the agreement breached, or the harm caused, stated plainly. Name the trademark, the copyrighted work, the contract clause, or the duty you say was breached. If you cite a statute, cite it correctly: an invented or misquoted citation is the fastest way to destroy the letter's credibility
• A clear demand — exactly what must stop, stated so plainly that compliance is unambiguous. 'Stop using my business name' is better than 'cease all unlawful activities'; 'remove the post at [URL] and do not republish it' is better still
• A compliance deadline — typically 7 to 14 days for simple demands (stop contacting me, take down a post) and up to 30 days for complex ones (rebrand, pull products from sale). The deadline must be realistic for what you are asking: an impossible deadline reads as a threat, not a genuine attempt to resolve the dispute
• The specific consequence — the next step you will actually take if the conduct continues. Name it: filing a claim, seeking an injunction, reporting to a regulator. 'We will take all available legal remedies' is filler; a named next step is a warning the recipient can price
• Signature and date — sign it, date it, and keep a copy. Send it by a method that proves delivery: registered mail or a courier with tracking, or email with a read receipt where the recipient's address is known. Proof of delivery is what turns the letter into evidence later

One more element that belongs in every letter, even though it is not a numbered item: restraint. Write like a reasonable person documenting a problem, not like a villain in a film. State facts, cite dates, and keep the tone firm and factual. The letter may one day be read by a judge — write every sentence as if it will be.

What a cease-and-desist letter cannot do

The limits are as important as the contents, because overclaiming is where most letters fail:

• It cannot compel anyone: the recipient may legally ignore it. Only a court order — an injunction, for example — can compel conduct, and only a court can grant one
• It cannot create rights: if you do not actually own the trademark, hold the copyright, or have the contract right you claim, the letter does not conjure it into existence — and asserting a right you do not have can expose you to costs and counterclaims
• It cannot impose fines or penalties: threats of fines, of 'damages of $X per day,' or of criminal prosecution are empty unless a court or statute actually provides them, and inventing them undermines everything else in the letter
• It cannot gag lawful speech: a letter cannot prohibit someone from giving an honest review, reporting a genuine complaint to a regulator, or speaking truthfully about a dispute — and trying to use one that way can trigger the anti-SLAPP consequences described above
• It cannot replace the real process: for a tenant-landlord dispute, a workplace complaint, or a regulated industry, the letter sits alongside the proper forum (the Landlord and Tenant Board, a human rights tribunal, a regulator) — it does not substitute for filing there

Understanding these limits is not pessimism — it is what makes the letter credible. A sender who plainly understands what the letter can and cannot do is a sender the recipient takes seriously.

The risks of bluffing: why empty threats are expensive

The single most common failure mode of cease-and-desist letters is bluffing: threatening a lawsuit you will never file, claiming rights you do not hold, or demanding far more than the law entitles you to. It feels powerful when you send it. It is usually a mistake, for four reasons.

First, bluffs get called. Recipients who talk to a lawyer — and businesses usually do — learn quickly which threats are real. A bluff that is called leaves you with two bad options: file a claim you did not want to file, or back down and confirm that your letters can be ignored. Either way, your next letter carries less weight than your first.

Second, bluffs become evidence. If the dispute does reach court, the other side will file your letter. A judge reading exaggerated claims, invented citations, or demands that go beyond what the law allows will doubt your credibility on the rest of your case too. Overreach in the letter becomes overreach in the courtroom.

Third, bluffs can create liability of their own. A letter containing false statements of fact about the recipient can support a defamation claim against you. Threatening criminal charges to gain a civil advantage can itself be unlawful. And a letter that is really an attempt to silence legitimate public participation can attract an anti-SLAPP response in Ontario, with costs consequences for the sender.

Fourth, bluffs cost the one thing a letter is supposed to buy: a quick, cheap resolution. A recipient who receives a measured, accurate letter can comply without losing face. A recipient who receives a wild one has every incentive to fight — and to show the letter to everyone involved. The rule is absolute: threaten only what you are prepared to do, demand only what you are entitled to, and assert only what you can prove.

If you received one: how to respond

Receiving a cease-and-desist letter is alarming, but remember the central fact: it is not a court order, and you are not legally required to respond. That said, ignoring it outright is usually the worst option — silence reads as refusal, and refusal is what turns a letter into a lawsuit.

Work through it in order. First, check what it actually is: a letter is not a statement of claim, and a letter with no court stamp carries no deadline imposed by a court — but if court documents are attached, those do have real deadlines, and missing them has real consequences. Second, check the facts: are the dates, quotes, and claims accurate? If they are wrong, say so in writing, briefly and factually — a correction on the record is worth more than an angry phone call. Third, check the law: does the sender actually hold the right they claim, and does your conduct actually infringe it? If you are unsure, a short consultation with a lawyer is cheaper than either complying with a baseless demand or ignoring a valid one. Fourth, decide: comply, negotiate, or dispute — and put your position in writing, keeping the tone as measured as the letter you wish you had received. Do not admit liability you do not accept, and do not make counter-threats you cannot back up.

One caution that applies to recipients as much as senders: do not post the letter publicly in anger, and do not destroy or delete the conduct it complains about if litigation is a real possibility — deleting evidence after receiving a demand letter can be held against you far more harshly than the original conduct.

If it's ignored: the real next steps

An ignored letter is not a failure — it is information. It tells you the recipient will not move without compulsion, and it gives you the evidence that they were warned. The next step depends on the dispute, and it should be the step you named in the letter:

• A lawyer's follow-up letter: sometimes the second letter, on firm letterhead, is what moves a recipient who dismissed the first. It is also the cheapest escalation available
• Small Claims Court: in Ontario, claims up to $50,000 can be filed in Small Claims Court — the forum for most unpaid amounts, minor property damage, and straightforward contract claims, without the cost of Superior Court litigation
• An injunction: where the conduct is ongoing and causing continuing harm — continued publication, continued use of a mark, continued disclosure of confidential information — a court can order the conduct stopped. Injunctions are discretionary and fact-sensitive, which is why the paper trail from your letter matters
• Regulators and platforms: for misleading advertising, professional misconduct, or platform abuse, the regulator or the platform itself may act faster than any court — file the complaint with the letter attached as evidence of notice
• Police, where the conduct is criminal: threats, stalking, fraud, and harassment that crosses into criminal conduct belong with police, reported on their own merits and not as leverage in a civil dispute

Whatever the next step, do not send the same letter again with a louder deadline. Repetition without escalation teaches the recipient that your deadlines mean nothing. Escalate once, deliberately, to the step you warned about — or accept a negotiated outcome and move on. Both are better than a third copy of the same letter.

Ontario specifics worth knowing

Cease-and-desist letters are a matter of general Canadian common law and federal statutes (the Trademarks Act, the Copyright Act) rather than a single Ontario statute — but three Ontario points come up repeatedly. First, the forum for most follow-up claims is Ontario Small Claims Court, with its $50,000 limit (raised from $35,000 in October 2025) — which shapes what a realistic threat looks like for ordinary disputes. Second, Ontario's anti-SLAPP provision, section 137.1 of the Courts of Justice Act, lets a defendant move to dismiss a proceeding brought to stifle expression on a matter of public interest — a real risk for senders whose letters are aimed at critics rather than at genuine wrongdoing. Third, Ontario's court and tribunal system rewards the paper trail: adjudicators at every level, from Small Claims deputy judges to LTB members, give weight to a sender who documented the problem, gave a fair deadline, and escalated proportionately — and discount a sender who did not.

For Quebec readers, note that the equivalent demand letter is the mise en demeure, which carries its own formal requirements under the Civil Code — including, in some cases, the ability to put the recipient formally in default, which affects interest and costs. A cease-and-desist letter drafted for Ontario should not simply be translated and sent into Quebec without that difference in mind.