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.
Clear explanation of the difference between fair dismissal and unfair dismissal under UK employment law, including legal reasons for dismissal, procedural fairness, Employment Tribunal assessment, ACAS Code requirements, and compensation rules in England and Wales.
In UK employment law, dismissal is not automatically unlawful simply because an employee disagrees with it. The law distinguishes between fair dismissal and unfair dismissal, depending on the reason for termination and the procedure followed by the employer.
These concepts are primarily governed by the Employment Rights Act 1996 Employment Rights Act 1996 and are assessed by the Employment Tribunal Employment Tribunal when disputes arise. The distinction is central to determining whether a dismissal was lawful and whether compensation may be awarded.
What Is Fair Dismissal?
A fair dismissal occurs when an employer terminates employment for a legally valid reason and follows a reasonable process.
Under UK law, there are five potentially fair reasons for dismissal:
1. Conduct
Dismissal due to misconduct, such as:
- Theft or dishonesty
- Gross insubordination
- Serious breaches of workplace rules
2. Capability or performance
Where the employee cannot perform the job to the required standard due to:
- Poor performance
- Lack of skills or qualifications
- Ill health affecting ability to work
3. Redundancy
Where the role is no longer required because of:
- Business closure
- Reduced need for work
- Restructuring
4. Statutory restriction
Where continuing employment would breach the law, such as:
- Loss of right to work
- Regulatory disqualification
5. Some other substantial reason (SOSR)
A broad category covering legitimate business reasons not covered above.
Even if a fair reason exists, the employer must still act reasonably in handling the dismissal.
What Is Unfair Dismissal?
Unfair dismissal occurs when an employer:
- Does not have a fair reason, or
- Fails to follow a fair procedure, or
- Acts unreasonably in all the circumstances
Employees usually require two years' continuous service to bring an ordinary unfair dismissal claim, although there are exceptions for automatically unfair dismissal (for example, whistleblowing or pregnancy-related dismissal).
The test applied by tribunals is whether the employer acted within the “range of reasonable responses”, meaning whether a reasonable employer could have made the same decision.
Key Differences Between Fair and Unfair Dismissal
1. Legal justification
- Fair dismissal: Based on one of the five statutory reasons
- Unfair dismissal: Lacks a valid reason or is not handled reasonably
2. Procedure followed
- Fair dismissal: Proper investigation, hearing, and appeal process followed
- Unfair dismissal: Inadequate or missing procedure, such as no hearing or investigation
Guidance from ACAS sets out expected minimum standards through its Code of Practice.
3. Reasonableness of employer's actions
- Fair dismissal: Decision falls within a reasonable range of responses
- Unfair dismissal: Decision is outside what a reasonable employer would do
4. Legal outcome
- Fair dismissal: No legal liability if both reason and procedure are lawful
- Unfair dismissal: May lead to tribunal compensation or reinstatement
5. Employee eligibility
- Fair dismissal concept: Applies to all employment decisions
- Unfair dismissal claim: Usually requires qualifying service or an exception
The Role of Procedure in Determining Fairness
Even if an employer has a valid reason for dismissal, the process used is critical.
A fair procedure typically includes:
- A proper investigation
- Notification of allegations or concerns
- A disciplinary hearing
- The right to be accompanied
- A written decision
- The right to appeal
Failure to follow these steps can convert what might otherwise be a fair dismissal into an unfair one.
How Employment Tribunals Assess Fairness
The Employment Tribunal Employment Tribunal evaluates two main elements:
1. Substantive fairness
Whether the employer had a genuine and lawful reason for dismissal.
2. Procedural fairness
Whether the employer followed a fair and reasonable process.
The tribunal applies the range of reasonable responses test, meaning it does not substitute its own view but assesses whether the employer acted reasonably at the time.
Examples of Fair vs Unfair Dismissal
Example of fair dismissal
An employee repeatedly fails to meet performance targets despite:
- Training
- Written warnings
- Opportunity to improve
A structured process is followed, and dismissal is likely to be considered fair.
Example of unfair dismissal
An employee is dismissed immediately after an allegation without:
- Investigation
- Disciplinary hearing
- Opportunity to respond
Even if concerns existed, the lack of procedure may render the dismissal unfair.
Automatically Unfair Dismissal
Some dismissals are unlawful regardless of fairness or procedure, including dismissals related to:
- Whistleblowing
- Pregnancy or maternity
- Health and safety activities
- Trade union membership
- Assertion of statutory rights
These claims do not require two years' service.
Remedies for Unfair Dismissal
Where dismissal is found to be unfair, the tribunal may award:
- Basic award (statutory calculation based on age and service)
- Compensatory award (loss of earnings and benefits)
- Reinstatement or re-engagement (rare but possible)
Compensation is intended to reflect financial loss rather than punish the employer.
Time Limits for Claims
Strict time limits apply:
- Unfair dismissal claims must usually be brought within 3 months minus one day of termination
- Early engagement with ACAS through Early Conciliation is required before submitting a claim
Common Misunderstandings
“Any dismissal I disagree with is unfair”
Not correct. The tribunal applies legal standards of reasonableness and procedure.
“Fair dismissal means the employee did something wrong”
Not always. Redundancy or legal restriction can also justify fair dismissal.
“No warning automatically makes dismissal unfair”
Not always, especially in gross misconduct cases where summary dismissal may be justified if procedure is still followed.
Practical Summary
The difference between fair dismissal and unfair dismissal depends on both the reason for termination and the procedure followed. A dismissal is fair when it is based on a lawful reason and handled in a reasonable and structured way. It becomes unfair when the employer lacks a valid reason, fails to follow proper procedure, or acts outside the range of reasonable responses. Employment Tribunals assess both elements when deciding claims under the Employment Rights Act 1996 Employment Rights Act 1996.
