Responding to a Demand Letter in Ontario: Your Options Before You Get Sued

A demand letter landed in your inbox or mailbox, and now someone — often a lawyer — wants money from you, with a deadline attached. Before you panic, ignore it, or fire back an emotional reply, it helps to know that how to respond to a demand letter in Ontario usually comes down to a handful of realistic options, not one right answer.

A demand letter is not a lawsuit. It's a warning shot, meant to resolve the dispute before it gets to court — which means how you respond can genuinely change what happens next, including whether a lawsuit happens at all.

Read the Letter Closely First

Before deciding anything, identify exactly what's being claimed: the amount, the legal basis (an unpaid invoice, a loan, a breach of contract, something else), the deadline given, and what happens if you don't respond. Demand letters vary widely in how detailed and well-supported they are — some are backed by clear documentation, others are far thinner than they look.

Note the deadline, but don't assume it's a hard legal cutoff for anything other than the letter's own terms — it's simply how long the sender says they'll wait before their next step.

Option 1 — Verify the Debt Before You Respond

Don't assume the claim is accurate just because it's on letterhead. Check your own records: contracts, invoices, payment history, correspondence. Confirm the amount claimed, how it was calculated, and whether you actually owe it, owe less than claimed, or don't owe it at all.

This step alone resolves a surprising number of demand letters — sometimes the amount is simply wrong, already paid, or based on a misunderstanding.

Option 2 — Pay or Propose Payment Terms

If, after checking, the debt is genuine and roughly accurate, paying — or proposing a reasonable payment arrangement — is often the cheapest path forward. Responding constructively, even if you can't pay in full immediately, is usually better received than silence, and can avoid the cost and stress of a lawsuit entirely.

Option 3 — Dispute the Claim in Writing

If you genuinely disagree with the debt or the amount, respond in writing explaining why — with reference to your own documentation where possible. A clear, factual dispute puts the other side on notice that this isn't a straightforward case, which sometimes leads to renegotiation rather than escalation.

Avoid vague denials without explanation; a specific, documented response carries far more weight.

Option 4 — Raise a Competing Claim or Set-Off

If you believe the other side separately owes you money connected to the same relationship, that may reduce or eliminate what you owe them through a set-off, or support a claim of your own if the matter proceeds. This is worth raising early and clearly, with supporting documentation, rather than saving it as a surprise later.

Option 5 — Get Legal Advice Before You Reply

For anything beyond a small, clear-cut amount, or where the letter alleges something more complex than a simple unpaid debt, get advice before you respond. A lawyer can help you assess the strength of the claim, the risk of a lawsuit if it's not resolved, and how to phrase a response that protects your position.

What Not to Do

• Don't ignore it and hope it disappears. Some demand letters do go nowhere, but many are a genuine precursor to a court claim.
• Don't respond with an emotional or informal message that could later be read as an admission or used against you.
• Don't wait until the deadline to start thinking about your options. Give yourself time to gather documents and, if needed, get advice.
• Don't assume the amount claimed is final or non-negotiable — demand letters often leave room for discussion.

Frequently asked questions