This guide is maintained as a current resource for September 2026 and covers only the laws of England and Wales. Information is for general guidance, not legal advice. Consult a qualified solicitor for advice specific to your situation.
Guide to appealing a dismissal through internal procedures in England and Wales, covering ACAS Code requirements, grounds of appeal, appeal hearings, employer policies, time limits, and the role of appeals in Employment Tribunal unfair dismissal claims.

Why internal dismissal appeals matter
When an employee is dismissed, most UK employers provide an internal appeal process. This procedure allows the dismissal decision to be reviewed before any external legal action is taken. In many cases, an appeal is a critical step in challenging a dismissal outcome, particularly where procedural errors, incorrect facts, or unfair reasoning may have influenced the decision.
Internal appeals are also relevant in Employment Tribunal claims, as tribunals often consider whether an employee used available internal processes when assessing overall fairness.
Legal framework governing dismissal appeals
ACAS Code of Practice
The ACAS Code of Practice on Disciplinary and Grievance Procedures sets out minimum standards for fair workplace discipline processes. It states that employees should be given the right to appeal any disciplinary decision, including dismissal. Employment tribunals take compliance with the Code into account when assessing fairness.
Failure to provide or properly conduct an appeal can contribute to a finding of unfair dismissal and may increase compensation.
Employment Rights Act 1996
Under the Employment Rights Act 1996, fairness is assessed based on whether the employer acted reasonably in all circumstances. A fair appeal process is often a key part of demonstrating overall procedural fairness.
Why appealing a dismissal is important
An internal appeal can:
- Correct factual or procedural errors
- Challenge unfair or inconsistent decisions
- Provide new evidence not previously considered
- Reduce or overturn a dismissal decision
- Strengthen a later Employment Tribunal claim if the appeal is mishandled
Tribunals often examine whether an appeal was offered and whether it was conducted fairly.
Step-by-step process for appealing a dismissal outcome
Step 1: Review the dismissal letter and appeal rights
The first step is to examine the dismissal outcome letter, which should include:
- Reason for dismissal
- Effective date of termination
- Confirmation of appeal rights
- Deadline for submitting an appeal
- Procedure for submitting the appeal
Many employers set strict time limits, often between 5 and 10 working days.
Step 2: Check the employer's disciplinary policy
Most organisations have a disciplinary or HR policy outlining:
- How appeals must be submitted
- Who hears the appeal
- Whether new evidence is allowed
- The structure of the appeal hearing
Appeals should follow the employer's internal procedure unless there is a clear reason not to.
Step 3: Identify grounds of appeal
A dismissal appeal should clearly set out the reasons why the decision is being challenged. Common grounds include:
1. Procedural unfairness
- Failure to follow disciplinary procedure
- Lack of proper investigation
- Bias or conflict of interest in decision-making
2. Incorrect facts
3. Disproportionate sanction
- Dismissal too severe for the alleged misconduct or performance issue
- Failure to consider alternative sanctions
4. New evidence
- Information not previously available
- Witness evidence not considered earlier
- Documents overlooked during investigation
Step 4: Submit the appeal in writing
Appeals should normally be submitted in writing, including:
- Clear statement that it is an appeal
- Grounds of appeal
- Supporting evidence (if available)
- Reference to specific policy breaches or factual errors
- Request for appeal hearing
It is important to keep a copy of the submission and proof of sending.
Step 5: Prepare for the appeal hearing
If a hearing is held, the employee may:
- Be accompanied by a colleague or trade union representative (in many cases this is a statutory right in disciplinary hearings)
- Present arguments against the dismissal decision
- Refer to documents and evidence
- Respond to management's justification
The appeal is typically conducted by a manager not previously involved in the case, although this is not always guaranteed.
Step 6: Attend the appeal hearing
During the hearing:
- The employer explains the original decision
- The employee presents their case
- Questions may be asked by the appeal panel
- Evidence is reviewed
The focus is usually on whether the original decision was reasonable based on available information at the time.
Step 7: Receive the appeal outcome
Possible outcomes include:
- Dismissal upheld
- Dismissal overturned and employee reinstated
- Reduced sanction (e.g. written warning instead of dismissal)
- New disciplinary hearing ordered
The outcome should be confirmed in writing with reasons.
Legal importance of internal appeals in tribunal claims
Impact on unfair dismissal claims
Employment Tribunals consider:
- Whether an appeal was offered
- Whether the appeal was conducted fairly
- Whether errors in the original decision were corrected
A fair appeal process can reduce the likelihood of a finding of unfair dismissal.
Timing and procedural relevance
Failure to appeal is not always fatal to a claim, but it may:
- Affect credibility
- Limit opportunities to correct errors internally
- Be considered when assessing overall fairness
Common issues in dismissal appeal processes
1. Lack of independence
Appeals heard by the same decision-maker or someone involved in the investigation may be considered unfair.
2. No meaningful review
An appeal that simply confirms the original decision without reconsideration may be procedurally weak.
3. Ignoring new evidence
Failure to consider relevant new information can undermine fairness.
4. Poor documentation
Inadequate records of appeal reasoning can be problematic in tribunal proceedings.
Strategic considerations when appealing a dismissal
- Focus on clear, structured grounds rather than emotional arguments
- Identify procedural and factual errors specifically
- Reference employer policies and inconsistencies
- Include evidence rather than assertions where possible
- Maintain consistency with any later tribunal claim
Time limits for appeals
Internal policies usually impose short deadlines, commonly:
- 5 to 10 working days from dismissal notification
Missing the deadline may result in loss of appeal rights, although employers sometimes accept late appeals in exceptional circumstances.
Relationship between appeal and Employment Tribunal claims
An internal appeal is separate from legal proceedings but can affect them by:
- Providing additional evidence for tribunal use
- Demonstrating attempts to resolve dispute internally
- Clarifying employer reasoning
- Potentially resolving the dispute without litigation
Key Takeaways
Appealing a dismissal through internal procedures is a key step in challenging termination decisions in UK employment law. The process involves reviewing dismissal reasons, identifying grounds of appeal, submitting a written challenge, attending an appeal hearing, and receiving a final outcome.
A well-prepared appeal focuses on procedural errors, factual inaccuracies, and proportionality of the sanction. Internal appeals are also significant in Employment Tribunal proceedings, where they form part of the overall assessment of fairness.