What Are Common Employer Defences in Dismissal Claims?

In Employment Tribunal proceedings in England and Wales, dismissal claims are typically brought as unfair dismissal, wrongful dismissal, or related statutory claims under the Employment Rights Act 1996. Once an employee establishes that they were dismissed, the focus shifts to the employer, who must justify the dismissal and demonstrate compliance with legal standards.

Employer defences in dismissal cases are structured around statutory tests and procedural fairness. The tribunal does not simply ask whether a dismissal occurred, but whether the employer acted reasonably, followed a fair process, and had a lawful basis for the decision.

This article explains the most common employer defences used in dismissal claims, how they operate in practice, and how tribunals assess their validity.

Legal Framework for Employer Defences

Employer defences in dismissal cases are primarily assessed under:

• Employment Rights Act 1996 (particularly sections 94–98)
• Common law principles of contract (for wrongful dismissal)
• Equality Act 2010 (where discrimination is alleged)
• ACAS Code of Practice on Disciplinary and Grievance Procedures

Under section 98 of the Employment Rights Act 1996, an employer must show:

1. A potentially fair reason for dismissal
2. That the decision to dismiss was reasonable in all the circumstances

The tribunal then determines whether dismissal fell within the “range of reasonable responses” open to a reasonable employer.

1. Conduct (Misconduct) Defence

One of the most common employer defences is that the dismissal was based on employee misconduct.

Typical misconduct allegations include:

• Persistent lateness or absenteeism
• Breach of workplace policies
• Dishonesty or theft
• Insubordination
• Gross misconduct such as violence or serious misconduct

What the employer must prove:

• A genuine belief that misconduct occurred
• Reasonable grounds for that belief
• A reasonable investigation
• A fair disciplinary process
• A proportionate sanction (dismissal must be reasonable)

Tribunals do not decide whether the employee was actually guilty but whether the employer's belief was reasonable based on evidence.

2. Capability or Performance Defence

Employers frequently defend dismissal claims on the basis that the employee was not capable of performing their role.

Capability may relate to:

• Poor performance
• Lack of qualifications or skills
• Ill health affecting ability to work

Legal requirements for this defence:

• Clear evidence of performance issues
• Warnings and opportunities to improve
• Reasonable support or training where appropriate
• Proper assessment of performance standards

Dismissal without adequate performance management is often found unfair, even if performance concerns are genuine.

3. Redundancy Defence

Redundancy is a lawful potentially fair reason for dismissal under employment law.

A valid redundancy situation may arise where:

• The employer's business closes
• A workplace closes
• There is a reduced need for employees to do certain work

Employer must show:

• A genuine redundancy situation exists
• Fair selection criteria were used
• Employees were properly consulted
• Suitable alternative employment was considered

Tribunals scrutinise redundancy processes closely, particularly selection fairness and consultation quality.

4. Statutory Illegality or Legal Restriction Defence

An employer may defend a dismissal by arguing it was necessary because continued employment would be unlawful.

Examples include:

• Loss of right to work in the UK
• Loss of required professional licence
• Legal prohibition on employing the individual in that role

The employer must show the legal restriction genuinely applied and could not reasonably be resolved.

5. “Some Other Substantial Reason” (SOSR) Defence

This is a broad statutory category used where dismissal does not fit traditional reasons like misconduct or redundancy.

Common SOSR examples include:

• Breakdown in working relationships
• Business reorganisation
• Refusal to accept contractual changes
• Third-party pressure (e.g., clients refusing to work with an employee)

Tribunals carefully examine SOSR cases to ensure the reason is genuine and substantial, not a disguised unfair dismissal.

6. Procedural Fairness Defence

Even where a valid reason exists, employers often rely on the argument that a fair process was followed.

Key procedural elements include:

• Reasonable investigation
• Informing the employee of allegations
• Disciplinary hearing with opportunity to respond
• Right to be accompanied
• Right of appeal

Failure to follow a fair procedure can render a dismissal unfair even if the reason is valid.

7. Range of Reasonable Responses Defence

A central legal principle in unfair dismissal cases is that tribunals do not substitute their own view for that of the employer.

Instead, they assess whether dismissal fell within a reasonable range of responses.

This means:

• More than one reasonable outcome may exist
• Dismissal does not need to be the “best” decision
• It must be within what a reasonable employer might do

This defence is frequently used in misconduct and capability cases.

8. Contributory Fault Defence

Employers may argue that the employee's conduct contributed to their dismissal.

This may reduce compensation where:

• The employee engaged in misconduct
• The employee ignored warnings or procedures
• The employee contributed to breakdown in trust

Tribunals can reduce awards if contributory conduct is established.

9. Polkey Reduction Defence

Even if dismissal is procedurally unfair, employers may argue that the outcome would have been the same regardless of procedure.

This is known as a Polkey reduction.

Effect:

• Compensation may be reduced
• Tribunal may conclude dismissal was inevitable
• Employer avoids full financial liability

This is commonly used where procedural errors occurred but dismissal would likely still have happened.

10. Limitation and Procedural Defences

Employers may also rely on procedural arguments such as:

• Claim brought outside the three-month limitation period
• Failure to complete ACAS Early Conciliation
• Lack of tribunal jurisdiction
• Incorrect employment status (employee vs worker vs contractor)

These defences can prevent a claim proceeding entirely.

Evidence-Based Nature of Employer Defences

Employer defences succeed or fail based on evidence, including:

• HR records and disciplinary notes
• Witness statements
• Emails and internal communications
• Performance reviews
• Investigation reports

Tribunals place significant weight on contemporaneous documentation created at the time of dismissal decisions.

Common Weaknesses in Employer Defences

Tribunals often reject employer defences where:

• Investigations were incomplete or biased
• Evidence was not properly documented
• Procedures were inconsistent with internal policies
• Decision-makers relied on unverified assumptions
• Disciplinary outcomes were disproportionate

Consistency and fairness are central to tribunal assessment.

Key Takeaways

Employer defences in dismissal claims are primarily based on statutory justifications such as misconduct, capability, redundancy, statutory illegality, and other substantial reasons. Even where a valid reason exists, employers must show that a fair procedure was followed and that dismissal was within the range of reasonable responses.

Additional defences may include contributory fault, Polkey reductions, and procedural objections such as limitation periods. Ultimately, tribunal decisions depend heavily on evidence, process fairness, and the reasonableness of the employer's actions.