A disciplinary decision is not finished simply because the outcome letter has been sent. An appeal gives the employee a genuine opportunity to challenge the findings, procedure or sanction. For an SME, the difficult part is often finding someone sufficiently independent and deciding what needs reconsidering. The answer is a structured review with authority to put things right, backed by evidence and clear reasons.
Treat the appeal as a decision, not an administrative formality
The current Acas Code says employees should be able to appeal formal disciplinary decisions. Appeals should be handled promptly and impartially, with an uninvolved manager wherever possible. An employer cannot satisfy that expectation by asking the original chair to confirm that they remain happy with their decision. The appeal needs an open mind and a meaningful opportunity to correct mistakes.
This guide concerns disciplinary appeals in Great Britain; Northern Ireland has a separate employment-law framework. It covers appeals against disciplinary sanctions, including dismissal. It does not replace the earlier investigation or hearing. On 21 October 2026, Acas was still reviewing responses to its consultation on a revised Code. That published draft is not the operative Code; the guidance here uses the current Code and published appeal guidance.
Clarify the grounds and the outcome being requested
Acknowledge the appeal and ask the employee to identify what they challenge and what they want changed. Separate factual disputes, procedural concerns, new evidence and the severity of the sanction. Someone saying that the whole process was unfair may need help identifying the particular decisions or omissions. Do not insist on legal terminology.
Check the deadline in your procedure. Acas recommends five working days from receipt of the outcome as an appropriate appeal period; this is guidance, not a universal statutory cut-off. If an appeal arrives late, consider the explanation and any relevant adjustment needs before rejecting it. Record your decision.
Create a short issue list. For example: Was the employee actually responsible for the missed delivery? Was a relevant witness overlooked? Was a final warning proportionate given the evidence? Each issue needs an answer. A page of conclusions is more useful when the reader can see which ground each conclusion resolves.
Choose someone with independence and authority
Acas recommends a manager who did not decide the original outcome and who can make the final decision. If that is not possible, make the process as impartial as possible; external involvement may help. In a family business, being a different director does not automatically remove a conflict if that director advised on the original sanction.
Agree the appointment before sharing the file. Establish whether an external person will decide the appeal or provide recommendations to an authorised decision-maker. Check the procedure and any contractual commitments. Nobody should discover after the hearing that the chair can only suggest changes that the original manager is free to ignore.
An impartial chair may ask the first decision-maker to explain their reasoning. Keep those questions and answers on the case record. Avoid private conversations that add fresh material without giving the employee a fair opportunity to respond.
Set the scope: targeted review or fuller rehearing
Check what your procedure promises and what the appeal actually requires. A narrow disagreement about a warning’s duration may be resolved by reviewing the sanction. An allegation that crucial evidence was excluded may require additional enquiries and a fuller reconsideration. These are practical choices about fairness, not labels that allow relevant issues to be avoided.
Prepare a document list containing the appeal, original allegations, investigation material, hearing notes, decision and relevant policy. Identify missing documents before the meeting. Tell the employee how the appeal will proceed and what outcomes the chair can consider. Leave enough preparation time for the material involved.
For example, a Gateshead distributor receives a dismissal appeal with a dispatch-system log that conflicts with a supervisor’s account. The chair should establish what the log records, check its reliability and hear the employee’s explanation. Repeating the supervisor’s conclusion does not resolve the new evidence.
Give the appeal a clear scope and a fair process.
HR + SAFETY’s HR support can help organise the grounds, review the procedure and plan the evidence needed before an appeal decision is made.
Discuss an appeal processHear the appeal and investigate unresolved points
Invite the employee in writing and explain accompaniment arrangements. There is a statutory right to an eligible companion at a disciplinary appeal hearing: a colleague, qualifying union representative or union official. Reasonable adjustments may require additional support. Explain the chair’s powers and let the employee develop their grounds.
Ask focused questions, summarise disputed points and adjourn where more information is needed. Acas advises that further investigation may involve checking new evidence or revisiting witnesses. Share the resulting report with the employee and provide an opportunity to comment before deciding.
Do not casually increase the sanction because the person appealed. Acas says the original outcome should not be increased unless the disciplinary policy allows this; new findings may instead need a new disciplinary procedure. Obtain specific advice before taking a more serious step.
Give reasons and implement the result
Communicate the appeal decision promptly in writing, with reasons and confirmation of whether it is final under the procedure. A practical letter addresses each appeal ground, explains the evidence accepted or rejected, states the resulting sanction and identifies any operational follow-up. If further enquiries cause delay, tell the employee why and when to expect an update.
Where a warning changes, specify its level, effective dates and any required improvement. Correct the personnel record and brief only those managers who need the outcome. Keep the decision history clear rather than leaving contradictory warnings in circulation.
A successful dismissal appeal will usually mean automatic reinstatement. Acas explains that the dismissal is then treated as not having happened: continuity is normally preserved and lost wages should be checked. An unsuccessful appeal leaves the original dismissal date in place. Plan payroll, benefits, access and the return to work carefully; do not assume that offering a new contract is the correct implementation.
The employer’s appeal checklist
- Acknowledge receipt and clarify every ground and requested remedy.
- Check the policy, time limit, contractual commitments and adjustment needs.
- Appoint an impartial chair with clearly defined authority.
- Decide what needs reviewing, rehearing or investigating further.
- Share the relevant evidence and arrange accompaniment and preparation time.
- Give the employee an opportunity to answer new material.
- Explain the outcome against each ground and confirm finality.
- Implement changes to records, pay, continuity and working arrangements.
A credible appeal can confirm a sound decision or correct a flawed one. The employer’s task is to make either outcome possible: define the questions, appoint an impartial decision-maker, test the evidence and carry the result through into practice.
This guide provides general information for UK employers. It is not legal advice and should not replace advice based on the facts of a specific matter.