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What Is a Demand Letter and When Should You Send One?

A demand letter is often the most efficient legal step in a civil dispute. This guide explains what it should contain, when it makes sense, and when it is better to move directly into another process.

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February 10, 2025 4 min read Civil Litigation

A plain-language guide to demand letters in Ontario, including what they contain, when to send one, when not to send one, whether to use a lawyer, what they cost, how they affect negotiation and evidence, and what to do if they are ignored.

A demand letter is often the last serious opportunity to resolve a dispute before legal proceedings begin. In many matters, it is also the most cost-effective step in the entire file.

The value of a demand letter is not just that it asks for something. It organizes the legal position, puts the other side on notice, sets a deadline, and signals that the matter is ready to escalate if it is ignored.

What Is a Demand Letter?

A demand letter is a formal written notice that typically:

  1. Sets out the factual basis of the claim
  2. States what is being demanded
  3. Gives a deadline
  4. Explains what will happen if the demand is not met

It is not a court filing, but it often becomes part of the evidentiary story later.

Why Demand Letters Work

Demand letters are effective because they combine:

  • Credibility
  • Clarity
  • Economic pressure

They tell the recipient that the dispute is no longer informal and that the next step may be costly.

The Anatomy of an Effective Demand Letter

A strong demand letter usually includes:

  • The correct parties
  • A concise factual summary
  • The legal basis for the demand
  • The amount or remedy sought
  • A firm but realistic deadline
  • A clear statement of next steps

The tone should be professional. A strong demand letter is not a rant.

When Should You Send a Demand Letter?

Demand letters are commonly used for:

  • Unpaid invoices
  • Breach of contract disputes
  • Property damage claims
  • Deposit disputes
  • Defamation or takedown demands
  • Commercial and business disputes

They are often the best first formal escalation after ordinary communication has failed.

When Not to Send a Demand Letter

Sometimes a demand letter is not the right move, including where:

  • Urgent court action is needed
  • You are not willing to follow through
  • The recipient is clearly judgment-proof
  • A contract requires another dispute process first
  • Productive negotiations are already underway

Sending a demand you do not intend to enforce can weaken your credibility.

Self-Written vs. Lawyer-Written Demand Letters

You can write your own demand letter. But a lawyer-written letter often adds:

  • Legal precision
  • Stronger presentation
  • Better strategic framing
  • More credibility with the recipient

The stronger the dispute, the more valuable careful drafting becomes.

How Much Does a Demand Letter Cost?

Cost depends on complexity. In many cases, the cost is modest compared with the cost of filing a lawsuit. That is one reason demand letters are often one of the best value legal tools available.

What Happens After You Send a Demand Letter

Typical outcomes include:

  • Full compliance
  • A negotiated response
  • No response
  • A contested legal reply

Each of those outcomes points toward a different next step.

What to Do If There Is No Response

If the letter is ignored, the next move depends on the economics and the claim. It may be:

  • Small Claims Court
  • Superior Court
  • Mediation or arbitration
  • Collection efforts
  • In some cases, writing the matter off

What to Do If the Response Is a Counterclaim

If the other side comes back with a competing claim, the dispute is no longer a simple one-way demand. At that stage, legal review becomes more important because strategy, risk, and settlement dynamics all change.

Demand Letters and the Limitation Period

This is important: a demand letter usually does not stop the limitation clock from running. If a filing deadline is approaching, court action may still be necessary even if a demand letter is sent.

Demand Letters as Evidence in Court

Demand letters can later help show:

  • The other side had notice of the claim
  • You attempted to resolve the matter before filing
  • The other side chose not to respond or comply

That can matter both practically and legally.

Industry-Specific Demand Letter Considerations

The right wording depends on the dispute. A demand letter in a construction dispute is not the same as one in an employment dispute, a defamation matter, or a pure debt file.

The Demand Letter Checklist

Before sending one, confirm:

  • The right recipient
  • A clear factual record
  • A correct legal theory
  • An accurate amount
  • A realistic deadline
  • A real plan if the letter is ignored

If the demand may lead to court, our Small Claims Court guide explains the next stage. For contract-based disputes, our article on breach of contract provides more context. If you are deciding whether to settle or move into a private process instead of court, see our guide to ADR versus trial.

Questions first-time buyers ask before closing

These are some of the most common questions people ask before sending a formal demand.

What is a demand letter?

A demand letter is a formal written notice that explains a legal claim, states what is being demanded, gives a deadline, and warns that legal action may follow if the demand is ignored.

Do demand letters have to come from a lawyer?

No, but a lawyer-written demand letter often carries more credibility, legal precision, and strategic value.

Does a demand letter stop the limitation period from running?

Not usually. A demand letter alone does not typically pause or extend the limitation period, so deadlines still need to be monitored carefully.

How much does a demand letter usually cost?

The cost varies with complexity, but a lawyer-prepared demand letter is often far less expensive than starting a lawsuit.

What if the other side ignores the demand letter?

If the letter is ignored, the next step may be negotiation, court action, or another dispute-resolution process depending on the facts and what the letter said would happen next.

Legal Disclaimer

This blog is for informational purposes only and does not constitute formal legal advice or establish a solicitor-client relationship. Reading this post does not replace obtaining advice from a licensed lawyer about your specific matter.

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