Final written warning letter

This letter confirms the outcome of a disciplinary hearing where the sanction is a final written warning. It sets out the allegations considered, the evidence, the employee's response, the findings and the reasons for them, the decision, what has to improve and by when, how long the warning stays live and how to appeal.

The letter records a decision. It does not create a fair one. A reasonable investigation, a written invitation enclosing the evidence, a genuine right to be accompanied by a colleague or trade union representative, a hearing at which the employee could put their case, and a decision maker who approached it with an open mind all have to come first.

The Acas Code and the uplift

The Acas Code of Practice on disciplinary and grievance procedures applies. Where a tribunal finds that an employer unreasonably failed to follow it, it can increase compensation by up to 25 per cent. Follow your own policy as well as the Code, and keep a written record of each step, because the record is what you will be asked for.

Is a final warning the fair sanction

This is the question the letter cannot answer for you. Where the misconduct is a first offence and not serious, a first written warning is usually the right starting point, and jumping a stage is one of the commonest procedural criticisms. The template includes an option for issuing a final warning at the first stage, but it should only be used where the misconduct is serious enough on its own to justify it, and the letter should say why.

What to be specific about

Name the improvement required and the date by which it must be achieved. A warning that asks for better conduct in general gives the employee nothing to work with and gives the employer nothing to rely on if matters do not improve. State clearly how long the warning remains live, and what may follow if there is further misconduct while it does.

Keep the file longer

From 1 October 2026 the time limit for bringing most employment tribunal claims rises from three months to six. Hearing notes, the evidence and this letter should be retained for longer than has been usual. Take advice where the facts are disputed, or where the employee has raised a grievance or a discrimination or whistleblowing complaint.