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.
Explanation of disciplinary procedures in UK dismissal decisions, including investigation, hearings, employee rights, ACAS Code requirements, fair dismissal rules, and how procedural failures affect Employment Tribunal claims under the Employment Rights Act 1996.

A disciplinary procedure is the formal process an employer uses to address concerns about an employee's conduct, performance, or behaviour. In the context of dismissal decisions, it is the structured framework that determines whether an employee should be given warnings, alternative sanctions, or ultimately dismissed.
In UK employment law, disciplinary procedures are closely linked to the fairness of dismissal under the Employment Rights Act 1996 Employment Rights Act 1996. Failure to follow a reasonable procedure can lead to findings of unfair dismissal by an Employment Tribunal Employment Tribunal, even where the employer had a potentially valid reason to dismiss.
What Is a Disciplinary Procedure?
A disciplinary procedure is a set of rules and steps that an employer follows when dealing with alleged misconduct or poor performance.
It is typically set out in:
- The employment contract
- Staff handbooks
- Workplace disciplinary policies
Most procedures follow guidance set out in the ACAS Code of Practice on Disciplinary and Grievance Procedures, published by ACAS.
The purpose of a disciplinary procedure is to ensure that dismissal decisions are:
- Fair
- Consistent
- Transparent
- Based on evidence
Why Disciplinary Procedures Matter in Dismissal Decisions
In dismissal cases, tribunals assess not only the reason for dismissal but also the process followed. Even if an employer has a valid reason (such as misconduct or poor performance), a flawed disciplinary process can make the dismissal unlawful.
A fair disciplinary procedure helps ensure compliance with legal standards, including:
- The requirement for reasonable investigation
- The right to respond to allegations
- The right to a fair hearing
- The right to appeal
Failure to follow these steps can significantly increase legal risk for employers.
Key Stages of a Disciplinary Procedure
1. Investigation
Before any disciplinary action is taken, the employer should carry out a reasonable investigation.
This may involve:
- Gathering documents and evidence
- Interviewing witnesses
- Reviewing emails, reports, or performance records
The investigation must be impartial and proportionate to the allegations.
2. Informing the employee
If there is a case to answer, the employee must be informed in writing. This includes:
- The specific allegations
- The evidence being relied upon
- The potential consequences, including dismissal
The employee should have sufficient time to prepare a response.
3. Disciplinary hearing
A formal meeting is held where:
- The employer presents the case
- The employee responds to allegations
- Evidence is reviewed
- Both sides may ask questions
The employee usually has the right to be accompanied by a colleague or trade union representative.
4. Decision
After the hearing, the employer decides on the outcome. Possible outcomes include:
- No action
- Informal warning
- First written warning
- Final written warning
- Dismissal
Dismissal should normally be reserved for serious misconduct or repeated breaches.
5. Appeal
Employees should be given the right to appeal the decision.
An appeal is typically reviewed by a different manager and may involve reconsideration of:
- Evidence
- Procedure
- Severity of sanction
Disciplinary Procedure and Fair Dismissal
Under UK law, dismissal must be both:
- Fair in substance (a valid reason)
- Fair in procedure (correct disciplinary process)
The main categories of fair dismissal include:
- Conduct
- Capability or performance
- Redundancy
- Legal restriction
- Some other substantial reason
Even where a fair reason exists, failure to follow a fair disciplinary process can lead to an unfair dismissal finding.
The Role of the ACAS Code
The ACAS Code of Practice sets out minimum standards for disciplinary procedures.
Tribunals consider whether employers have followed it when deciding unfair dismissal claims. Key principles include:
- Acting consistently
- Carrying out proper investigations
- Informing employees of allegations
- Allowing representation
- Providing an appeal process
Failure to follow the Code does not automatically make a dismissal unfair, but it can increase compensation awards.
Disciplinary Procedures in Summary Dismissal (Gross Misconduct)
Summary dismissal occurs without notice, usually for gross misconduct.
Even in these cases, a disciplinary procedure is still required. Employers must:
- Investigate the alleged misconduct
- Hold a disciplinary hearing
- Allow the employee to respond
- Make a reasoned decision
Common examples of gross misconduct include:
- Theft
- Violence or threats
- Serious breaches of trust
- Fraud or dishonesty
Skipping procedure in gross misconduct cases can still result in legal claims.
Common Procedural Failures That Lead to Tribunal Claims
Employment Tribunals frequently find dismissal unfair where employers:
- Fail to investigate properly
- Pre-judge the outcome
- Do not disclose evidence to the employee
- Deny the right to a hearing
- Ignore mitigation or explanations
- Fail to offer an appeal
Even minor procedural errors can affect the overall fairness assessment.
Disciplinary Procedure and Employee Rights
Employees subject to disciplinary action generally have the right to:
- Be informed of allegations
- Access relevant evidence
- Attend a disciplinary hearing
- Be accompanied
- Appeal decisions
These rights form part of procedural fairness in dismissal decisions.
Disciplinary Procedure and Employment Tribunal Claims
If dismissal is disputed, the disciplinary process becomes central evidence in an Employment Tribunal Employment Tribunal.
The tribunal will assess:
- Whether the employer followed a reasonable process
- Whether the investigation was adequate
- Whether the decision was within the range of reasonable responses
- Whether the ACAS Code was followed
Where procedure is flawed, compensation may be increased by up to 25% in some cases due to non-compliance with the ACAS Code.
Practical Implications for Employers and Employees
For employers
A well-documented disciplinary procedure reduces legal risk and supports defensible dismissal decisions.
For employees
Understanding the procedure helps identify whether dismissal may be challengeable, particularly where steps were skipped or applied inconsistently.
Key Takeaways
A disciplinary procedure is the structured process used by employers to address misconduct or performance issues before making dismissal decisions. It typically involves investigation, notification, a hearing, a decision, and an appeal. In UK employment law, following a fair disciplinary procedure is essential to ensure that a dismissal is lawful. Failure to follow proper steps, particularly those set out in the ACAS Code of Practice, can lead to findings of unfair dismissal in an Employment Tribunal Employment Tribunal.