What "Without Prejudice" Actually Means

Plenty of people write "without prejudice" at the top of an email believing it makes the contents legally invisible. It does not work like that, and getting it wrong can cost you — either because you assumed something was protected when it was not, or because you assumed your employer's letter was protected when you could have used it.

What the rule actually is

Without prejudice is not a statute. It is a long-standing common law rule of evidence, and the point of it is narrow: to let two sides in a dispute try to settle it without either being punished later for what they offered.

The logic is practical. If every settlement offer could be read out at a tribunal as evidence, nobody would ever make one. So genuine attempts to settle an existing dispute are kept out of evidence, and both sides can speak plainly.

Writing the label does not create the protection

This is the part people get wrong. The protection comes from what the communication is, not from what you label it.

Two conditions have to be met. There must be a genuine dispute already in existence, and the communication must be a genuine attempt to settle it. Miss either and the words at the top are decoration.

So a letter marked "without prejudice" that simply criticises your performance, with no offer and no dispute on foot, is not protected. And an email that makes a real settlement offer during a live dispute usually is protected even if nobody labelled it at all.

Where people go wrong in practice

Three patterns come up repeatedly.

Marking everything. Some employers mark routine correspondence "without prejudice" as a habit. It does not make grievance outcomes or disciplinary letters inadmissible.

Assuming it cuts both ways automatically. If your employer makes you a protected offer and you reply engaging with it, your reply is part of the same protected exchange. That is usually what you want. But it does mean you cannot later quote your own reply as evidence of how reasonable you were.

Treating it as confidentiality. It is not a confidentiality clause. It governs what can be put in front of a tribunal or court, not who you are allowed to tell. Confidentiality is a separate promise, and if you want it you have to agree it.

When the protection falls away

The rule is not absolute. The clearest exception is what the courts call unambiguous impropriety — where the protection is being used as a cover for something improper, such as an outright threat. The bar is deliberately high, and a hard or unattractive negotiating position does not meet it.

Protection can also be lost where both sides agree to waive it, or where the dispute is about whether a settlement was reached at all.

"Without prejudice save as to costs"

You may see this longer version. It means the offer stays out of evidence while the case is being decided, but can be shown to the court afterwards when it decides who pays the costs — so a party who unreasonably refused a fair offer can be penalised.

It matters far more in the civil courts than in the employment tribunal, where each side normally bears its own costs and costs orders are unusual. In a tribunal it is not the lever it is in a county court claim.

Protected conversations are a different thing

This is the distinction worth knowing, because the two get muddled constantly.

Where there is no existing dispute, without prejudice does not apply — there is nothing to settle yet. Employment law fills that gap with pre-termination negotiations, sometimes called protected conversations, under section 111A of the Employment Rights Act 1996. That lets an employer open a conversation about ending employment on agreed terms even where no dispute has arisen.

The crucial limit is how narrow it is. A protected conversation is inadmissible in an ordinary unfair dismissal claim only. It is not protected in a discrimination claim, in an automatically unfair dismissal claim such as whistleblowing, or in a breach of contract claim.

So if you believe you are being pushed out because of a protected characteristic, a conversation your employer thinks is off the record may well be admissible in that claim. Write down what was said, and the date, as soon as it happens.

What to do if you receive one

• Do not feel rushed. A deadline of "by Friday" is a negotiating tactic, not a legal limit.
• Check whether a dispute genuinely existed. If not, it may be a section 111A conversation rather than without prejudice, which changes which claims it covers.
• Keep a dated note of anything said in a meeting, whatever label was attached.
• Be aware that a settlement agreement is only binding if it meets statutory conditions, including independent legal advice. Employers normally contribute to that cost.
• The tribunal clock does not stop while you negotiate. Time limits run regardless.

Check your own situation

Our free Settlement Agreement checker covers what a fair offer looks like, the tax treatment, and the independent advice requirement. If you are drafting the letter yourself, there is a free without prejudice letter template.