\"Without Prejudice\" Negotiations in Ontario: What Stays Confidential and What Doesn't

You have probably seen the phrase "without prejudice" stamped across the top of a settlement letter and assumed it means the letter is off-limits, full stop. It is a useful label, and it points at a real legal protection — but the phrase itself does not do all the work people think it does.

This article is written from the practical side of that phrase: how to actually use "without prejudice" correctly when you write or receive a negotiation letter, where its protection genuinely ends, and the mistakes that quietly undo it.

Where "Without Prejudice" Comes From

The label reflects an underlying rule of Ontario law that protects genuine attempts to settle a dispute from being used as evidence of liability if the case doesn't settle. The point is to let people negotiate candidly — make an offer, float a compromise, even acknowledge a weak point — without handing the other side ammunition for trial.

The label itself is just a signal of intent. What actually matters is whether the letter or conversation was a genuine attempt to resolve a live dispute. A court looks past the heading to the substance underneath it.

How to Label a Letter Correctly

• Use "without prejudice" for a genuine offer or settlement position you don't want used against you on the underlying dispute.
• Use "without prejudice save as to costs" instead, if you want to preserve the option of later showing the court that you made a reasonable offer, for the specific purpose of arguing about legal costs after a trial.
• Do not add the label to a letter that is really a formal demand, a factual notice, or a restatement of your legal position — mislabeling those doesn't strip out their content, and it can make your genuinely privileged letters look interchangeable with ones that aren't.
• Keep the label at the top of the document and apply it to the whole communication, rather than trying to protect only part of a letter.

What the Protection Actually Covers

• An offer to pay, or to accept, a specific amount to resolve the dispute
• A concession made in the course of negotiating — for example, acknowledging a delay or an error while still disputing the amount claimed
• Draft settlement terms exchanged before anything is finalized
• Statements made during a mediation or settlement conference, which generally carry the same protection, often reinforced by the process's own confidentiality rules

If talks fail, none of this is normally shown to the judge deciding the underlying dispute.

Where the Protection Runs Out

• A statement made outside a genuine settlement context does not become protected just because it happens to mention a number
• Threats, blackmail, or other improper conduct inside a "without prejudice" letter are not shielded by the label
• The fact that a settlement was reached — and its terms — can be proven and enforced even though the negotiation that led to it was privileged
• Both sides can agree to waive the protection later
• Ordinary factual or business communications sent around the same time as negotiations, but not actually part of the settlement attempt, remain open

"Without Prejudice" vs. Open Communication

Five Habits That Protect Your Negotiations

1. Keep settlement discussions in their own thread or letter, separate from ordinary business or factual correspondence.
2. Never mix a genuine settlement offer with a threat, an insult, or an unrelated demand in the same document — it can undercut the parts that matter.
3. Do not assume a verbal "off the record" comment on a call is protected just because you said it during a settlement discussion; put anything important in writing, labelled correctly.
4. Treat every "without prejudice" communication as though a judge might eventually read it, since exceptions do exist.
5. If a dispute is significant, have a lawyer draft or review your first settlement letter, since the wording that protects you is often not obvious to a non-lawyer.

Frequently asked questions