Writing a Demand Letter for an Unpaid Debt in Ontario

When someone owes you money and informal reminders are being ignored, a demand letter is often the single most effective step before starting a lawsuit. A well-crafted demand letter for an unpaid debt in Ontario puts the debtor on notice, establishes a paper trail, and frequently prompts payment — all without setting foot in a courtroom.

This article explains what a demand letter must contain, when it makes sense to have a lawyer write it, and what to do if the letter is ignored.

What Is a Demand Letter?

A demand letter is a formal written notice from a creditor to a debtor. It is not a court document — it is a private communication that:

1. States the precise amount owed and how it was calculated
2. Identifies the legal or contractual basis for the debt
3. Sets a deadline for payment
4. Warns that failure to pay will result in legal action

The letter creates an important record. If you later go to court, it shows the judge that you acted reasonably, gave the debtor a clear opportunity to pay, and did not rush to litigation.

What to Include in Every Demand Letter

Your Identity and the Debtor's Identity

State full legal names (and business names, if applicable) clearly. If you are a corporation, include the registered company name. If you are writing to a corporation, use the full registered name — not just a trade name.

A Clear Statement of the Debt

Describe what is owed and why:

• Unpaid invoice: include the invoice number, date, amount, and what services or goods were provided
• Personal loan: describe the loan date, amount, and agreed repayment terms
• Damages: briefly explain the loss and how you calculated the figure

Do not exaggerate. If you claim more than you are entitled to and the matter goes to court, inflated demands can undermine your credibility.

The Payment Deadline

Give a specific date — not a vague "please pay promptly." Fourteen days from the date of the letter is a common and reasonable deadline. It is long enough to be fair; short enough to signal seriousness.

Payment Instructions

Tell the debtor exactly how to pay: e-transfer, certified cheque, wire transfer. Ambiguity gives debtors an easy excuse.

The Consequence of Non-Payment

State plainly that if payment is not received by the deadline, you will commence legal proceedings without further notice. Do not threaten consequences you are not prepared to follow through on (for example, do not threaten criminal charges over a civil debt — that could itself constitute an offence).

Interest

If your contract specifies an interest rate on overdue amounts, state that interest is accruing. Even if no contract rate applies, Ontario law provides for pre-judgment interest on unpaid debts as of writing — verify the current rate with your lawyer or through the appropriate court resource.

Should a Lawyer Write the Letter?

You can write a demand letter yourself — there is no legal requirement for a lawyer's involvement. However, a letter on a law firm's letterhead carries different weight for a few reasons:

• It signals you are serious and have taken the step of retaining counsel
• It is less likely to contain statements that could be used against you later
• A lawyer can assess whether your claim is legally sound before you commit it to writing
• It often triggers a response (or payment) when a personal letter has failed

For smaller amounts, a self-written letter may be perfectly sufficient. For larger or more complex debts — or where the other party has their own lawyer — having a lawyer draft it is a worthwhile investment.

Sending the Letter

Send the demand letter by:

• Email (with a read receipt if possible) — fastest, and creates a timestamp
• Registered mail — provides proof of delivery
• Courier — creates a delivery record

Send it by more than one method if the amount is significant. Keep copies of everything sent and any acknowledgment or response received.

What Happens If the Letter Is Ignored?

If the debtor does not pay or respond by the deadline, you have several options:

1. File a court claim — Small Claims Court (up to $35,000 as of writing — verify) or Superior Court for larger amounts
2. Negotiate — some debtors respond only when a claim is formally filed
3. Mediation — if both parties are open to it, a mediator can help resolve the dispute without a trial

Ignoring a demand letter is not a defence. Courts regularly note that a party who received clear written notice and chose not to respond forfeited an easy opportunity to resolve the matter.

Common Mistakes to Avoid

• Threatening criminal action for a civil debt — keep your demands within civil remedies
• Overstating the amount — it can hurt your credibility in court
• Sending via informal channels only (e.g., a text message) — use a written, dated letter
• Waiting too long — limitation periods apply to civil claims in Ontario; as of writing, the basic limitation period is two years from when you knew or ought to have known about the claim. Verify current limitation rules before acting.

Frequently asked questions