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 $35,000, 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.

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.

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.