How to Write a Disciplinary Appeal Letter (Warning or Dismissal)

Last reviewed: June 2026 · For use in England & Wales · eLitigant is a Community Interest Company (No. 16566612), not a law firm. Always check the current official form on GOV.UK before you file, and sign the statement of truth yourself.

What a disciplinary appeal letter is

A disciplinary appeal letter is a formal written request asking your employer to reconsider a disciplinary outcome. That outcome might be a first or final written warning, a demotion, a loss of seniority, or dismissal. The letter triggers your employer’s appeal process, in which your case is looked at again — usually by someone who was not involved in the original decision.

The framework comes from the ACAS Code of Practice on Disciplinary and Grievance Procedures, issued under section 199 of the Trade Union and Labour Relations (Consolidation) Act 1992. The Code says employees “should be given the right to appeal.” While the Code itself is statutory guidance rather than a law that creates a free-standing claim, it carries real weight: an employment tribunal can increase or reduce a successful claimant’s compensation by up to 25% where either side has unreasonably failed to follow it (section 207A of the same Act). Appealing properly, and in writing, helps protect your position.

When and why to use one

You can appeal whenever you genuinely believe the outcome or the process was wrong. ACAS recognises several common grounds:

• The outcome was too severe — for example dismissal for something a warning would normally cover.
• The procedure was unfair — you were not told the allegations clearly, were refused the right to be accompanied, or were not given a fair hearing.
• The decision was not supported by the evidence, or the investigation was inadequate or one-sided.
• You have new evidence that was not available or considered at the original hearing.
• You were dismissed unfairly or treated inconsistently compared with colleagues in similar situations.

Timing matters. The ACAS Code says an appeal should be raised “without unreasonable delay.” Most employers set a short window in their disciplinary policy — commonly five working days from the date of the outcome letter — so check your policy and the outcome letter carefully and meet that deadline. Appealing also keeps your options open: if you later bring an unfair dismissal claim to an employment tribunal, having appealed shows you tried to resolve matters internally.

What to put in the letter

An effective appeal letter is short, factual and focused on your grounds. Aim to include:

• Your details and the decision you are appealing — your name, role, and the date and nature of the outcome (for example, “dismissal confirmed by letter dated 3 June”).
• A clear statement that you are appealing and that you wish to attend an appeal meeting.
• Your grounds, listed and numbered — be specific. Instead of “the decision was unfair,” say what was wrong: a witness was not interviewed, mitigation was ignored, the sanction was inconsistent with how a colleague was treated.
• Any new evidence you want considered, and why it is relevant.
• What you are asking for — for example that the warning be removed or reduced, or that you be reinstated.
• The remedy and a request to be accompanied. You have a statutory right under section 10 of the Employment Relations Act 1999 to be accompanied at the appeal hearing by a colleague or a trade union representative.

Keep the tone measured. Stick to facts you can support and avoid emotive or accusatory language. The ACAS Code expects appeals to be dealt with impartially and, wherever possible, by a manager not previously involved, so make it easy for a fresh decision-maker to follow your points.

Common mistakes and pitfalls

• Missing the deadline. The most common error is leaving it too late. Submit within the time stated in your policy, and date your letter.
• Being vague. “I disagree with the decision” is not a ground. Tie each point to a specific fact, document or procedural failing.
• Introducing nothing new. An appeal is a fresh look, but it helps to explain why the original outcome was wrong — point to evidence, mitigation or inconsistency rather than simply repeating earlier statements.
• Getting emotional or making accusations you cannot back up. Allegations of bad faith without evidence weaken an otherwise strong appeal.
• Not keeping a record. Send the letter in a way you can prove (dated email or recorded delivery) and keep a copy.
• Resigning first. Resigning before you appeal can undermine a later claim. If in doubt about your position, consider taking advice before acting.

This guide is general information about the appeal process under the ACAS Code, not legal advice about your particular situation. For tailored advice you can contact ACAS, Citizens Advice, a trade union or a solicitor.

Frequently asked questions

How long do I have to appeal a disciplinary decision?
There is no single statutory deadline, but the ACAS Code says you should appeal “without unreasonable delay.” Most employers’ policies give a specific window — often around five working days from the outcome letter. Always check your own disciplinary policy and the outcome letter, and meet whatever deadline they set.

Can I be accompanied at the appeal meeting?
Yes. Under section 10 of the Employment Relations Act 1999 you have a statutory right to be accompanied at the appeal hearing by a fellow worker or a trade union representative, provided you make a reasonable request. There is no automatic right to bring a solicitor.

What happens after I send the appeal letter?
Your employer should arrange an appeal meeting without unreasonable delay, hear your grounds, carry out any further investigation needed, and decide whether to confirm, change or overturn the original outcome. They should tell you the result in writing as soon as possible. The appeal decision is usually the final stage of the internal process.

Get yours drafted by Chris — £30 →

eLitigant drafts it; you check, sign & send. Not a law firm; information, not advice.