Demand Letters in Ontario: What They Are and When to Send One

Before a lawsuit is filed, before a court date is scheduled, and before lawyers spend months in discovery — there is often a single letter. A demand letter (sometimes called a "lawyer's letter" or a "notice of claim") is a formal written notice telling the other party what you are owed, why you are owed it, and what happens if they do not respond.

Done well, a demand letter resolves disputes that would otherwise cost both parties far more in time, money, and stress. Done poorly — or skipped entirely — it can miss opportunities to settle and, in some cases, actually weaken your legal position.

What Is a Demand Letter?

A demand letter is a pre-litigation document that formally puts the other party on notice of your claim. It is not a court filing. It does not start a lawsuit. What it does is:

• State your position clearly — the facts supporting your claim, presented in an organized and credible way.
• Quantify what you are owed — a specific dollar amount, or a specific action being demanded (return of property, compliance with a contract term).
• Give a deadline — typically 7 to 30 days, depending on the urgency and nature of the dispute.
• Signal consequences — if the demand is not met, you intend to pursue legal action.

The tone matters. A well-crafted demand letter is firm and specific — not threatening or inflammatory. Courts have occasionally seen letters that harm the sender's credibility, either because they overstate the claim or because they are unprofessional in tone.

When Should You Send a Demand Letter?

A demand letter is appropriate whenever you have a legitimate legal claim and there is some reason to believe the other side might resolve it without litigation if put on formal notice. Common scenarios include:

• Unpaid invoices or debts — a contractor, freelancer, or business owed money for work performed.
• Security deposit disputes — a tenant whose landlord has failed to return a deposit (subject to the applicable rules — Landlord and Tenant Board processes apply to many residential tenancy disputes).
• Breach of contract — a vendor who failed to deliver, a buyer who failed to pay, a service provider who did not perform.
• Property damage — a neighbour, contractor, or other party who caused damage to your property.
• Defective goods or services — demanding a refund or repair after a business fails to honour an implied or express warranty.

In some situations, a demand letter is a practical prerequisite before certain legal proceedings, or it is at least expected as a professional step that courts will look upon favourably.

What Should a Demand Letter Include?

A strong demand letter contains several core elements:

1. Identifying information — your name and contact information; the recipient's name and address.
2. A clear subject line — "Notice of Claim — [Short description]" or "Demand for Payment."
3. Statement of facts — a concise, accurate account of what happened: the agreement made, what the other party was required to do, what they failed to do.
4. The legal basis — the contract clause, the legal principle, or the right that has been violated. (You do not need to cite case law, but you should be clear about why you believe you are owed what you are claiming.)
5. The specific demand — the exact dollar amount, or the specific action required.
6. A response deadline — a firm date by which you expect a response or payment.
7. Notice of consequences — a statement that failure to respond will result in legal proceedings, including a claim for your costs.

Keep the letter factual and focused. Do not make threats that are not legally supportable. Do not exaggerate the claim.

Lawyer's Letter vs. Writing It Yourself

You can write and send a demand letter yourself. For straightforward situations — a clear unpaid invoice with no factual dispute — a well-organized self-written letter can be effective.

However, a letter drafted on law firm letterhead and signed by a lawyer carries noticeably more weight. It signals that you are serious, that a lawyer has assessed the claim, and that the recipient will be dealing with a prepared opponent if they do not respond. Recipients (and their insurers or lawyers) often take a lawyer-signed letter far more seriously than a letter from the claimant personally.

A lawyer can also help you avoid common mistakes:

• Overstating the claim — which can expose you to a costs award if you later recover less.
• Making inadmissible statements — documents produced in litigation can be examined, and admissions in demand letters can cause problems.
• Failing to identify the right legal basis — a vague letter gives the other side room to maneuver.
• Missing limitation period implications — a demand letter does not stop the limitation clock; only filing a court claim does.

What Happens After You Send It?

Several outcomes are possible:

• Full compliance — the other side pays or performs. This is the ideal outcome and happens more often than people expect, especially when the letter is clear, credible, and from a lawyer.
• Counteroffer or negotiation — the other side acknowledges the claim but disputes the amount or proposes different terms. This opens a negotiation.
• Denial — the other side disputes the claim entirely. You are then faced with a decision: escalate to litigation, or accept that the dispute will not resolve without court.
• No response — silence can mean many things. It may mean the letter was ignored; it may mean the recipient is consulting their own lawyer. Give the deadline some time to pass before concluding no response is forthcoming.

If the demand is not met, you proceed to filing a claim — in Small Claims Court (for amounts within the current monetary limit) or the Superior Court of Justice for larger disputes.

A Word on Preserving Evidence

Before you send a demand letter, make sure you have preserved the evidence supporting your claim: contracts, invoices, texts, emails, photos, and any other records. Once a dispute goes formal, you want your records to be organized and complete.

Frequently asked questions