How to write a demand letter in Ontario (with free template)

When to send a demand letter

Demand letters are used for unpaid invoices, unfinished contractor work, unreturned deposits, and money owed under an agreement. The common thread: you have a clear claim, you have tried informally, and you now need a written record.

Send it when informal reminders have failed but before you spend money on court. A letter costs almost nothing and creates a paper trail that judges take seriously — it shows you acted reasonably and gave the other side a fair chance.

What Ontario courts expect to see

Ontario's Small Claims Court handles claims up to $50,000 (limit raised from $35,000 on October 1, 2025), and judges expect plaintiffs to have tried to resolve the dispute first. A well-written demand letter demonstrates exactly that. It should contain six elements:

• Your name and contact details, plus the recipient's full name and address.
• The facts: what happened, in chronological order, with dates, amounts, and any agreement or invoice numbers.
• The exact amount owed or the specific action required — no vagueness.
• A clear deadline, usually 10 to 14 days from the date of the letter.
• What happens next if they do not comply — for example, that you intend to file a claim in Small Claims Court.
• Your signature and the date. Keep a copy and proof of delivery.

Demand letters for common Ontario situations

The structure is the same every time, but the details change with the dispute. For unpaid invoices (freelancers and small businesses), attach or reference the invoice numbers, the payment terms you agreed, and any partial payments — precision about the balance is what makes the letter enforceable later.

For contractor disputes, describe the specific deficiency (not just “bad work”): what was promised in the quote or contract, what was delivered, what it will cost to fix, and photos with dates. Give the contractor the chance to return and remedy — judges like to see that offer was made.

For unreturned deposits, name the exact amount, when and how you paid it, and why it's owed back. One Ontario wrinkle: if a landlord demanded an illegal security or damage deposit, your recovery route is the Landlord and Tenant Board (Form T1), not Small Claims Court — but the demand letter still works as the first step and the paper trail. Deposits between private parties, like a roommate's share or a contractor's deposit, go to Small Claims Court for amounts up to $50,000 (limit raised October 1, 2025).

How long should the deadline be?

Ten to fourteen days is the norm in Ontario. Shorter deadlines can look unreasonable to a judge; much longer ones signal you are not serious. Count from the date the recipient receives the letter, not the date you wrote it — sending by email with a read receipt or by registered mail gives you proof of when the clock started.

State the deadline as a specific date ("by October 14, 2026"), not just "within 14 days," so there is no argument about when it expired.

Tone: firm, not threatening

The most common mistake is writing the letter while angry. Threats, insults, or ultimatums beyond legal action can backfire — a judge reading your letter should see a reasonable person, not an aggressor. Stick to facts, keep sentences short, and state consequences calmly.

Never threaten anything you cannot or will not do, and never threaten criminal action to collect a civil debt. If you say you will file in Small Claims Court, be prepared to actually file if the deadline passes.

Mistakes that weaken your letter

A surprising number of demand letters fail on basics. Watch for these:

• No specific dollar amount — "you owe me money" is not a demand.
• No deadline — without one, there is nothing to enforce.
• Sending it to the wrong person or an old address.
• Admitting facts that hurt your own case in the description of events.
• No proof you sent it — always keep a copy and delivery confirmation.

If they offer to settle: get it in writing

A surprising number of demand letters work — the recipient calls and offers to pay over time or settle for less. That's a win, but only if it's documented. Confirm any agreement in writing (email is fine): the total amount, the payment schedule with specific dates, the payment method, and what happens if a payment is missed.

If you accept less than the full amount, say so explicitly and note whether the settlement is final — a short line like “this payment settles the matter in full” prevents the dispute from resurrecting later. And keep your court option warm: don't agree to deadlines longer than your limitation period allows. In Ontario you generally have two years from discovering a claim to file, but don't cut it close — file while the trail is fresh if payments stall.

What happens if they ignore it?

If the deadline passes with no payment or response, your next step in Ontario is typically a Plaintiff's Claim in Small Claims Court, which can be filed online through the Ontario court portal. The filing fee is modest, and many people represent themselves.

Bring your demand letter, the delivery proof, and every supporting document to the settlement conference. Judges routinely ask whether you sent a demand letter — having one puts you in a stronger position from the start.