What Is Meant by Reasonable Employer Behaviour in Dismissal Cases?

In UK employment law, dismissal is not assessed solely on whether an employer had a valid reason. The law also requires that the employer acted as a reasonable employer would in the same circumstances. This concept is central to determining whether a dismissal is fair under the Employment Rights Act 1996 Employment Rights Act 1996.

When a case is heard by the Employment Tribunal Employment Tribunal, the tribunal does not ask whether it would have dismissed the employee. Instead, it applies the “range of reasonable responses” test to decide whether the employer's actions fall within acceptable standards of workplace behaviour.

What Is Reasonable Employer Behaviour?

Reasonable employer behaviour refers to the standard of conduct expected from a competent and fair employer when making dismissal decisions. It includes both:

• The reason for dismissal, and
• The process used to reach that decision

A dismissal may be legally fair only if both elements meet the standard of reasonableness.

This standard is deliberately flexible to reflect different business sizes, industries, and workplace contexts.

The Legal Test: Range of Reasonable Responses

The key legal principle applied by tribunals is the “range of reasonable responses” test.

This means:

• The tribunal does not decide what it would have done
• It asks whether a reasonable employer could have acted in the same way
• More than one outcome may be reasonable

Even if another employer might have acted differently, the dismissal can still be fair if it falls within this range.

Key Elements of Reasonable Employer Behaviour

1. A fair reason for dismissal

Employers must rely on one of the five potentially fair reasons:

• Conduct
• Capability or performance
• Redundancy
• Statutory restriction
• Some other substantial reason

Without a valid reason, dismissal is unlikely to be fair regardless of procedure.

2. A reasonable investigation

A reasonable employer is expected to carry out a proper investigation before making a decision.

This may include:

• Gathering relevant evidence
• Interviewing witnesses
• Reviewing documents or records
• Ensuring decision-makers are impartial

The depth of investigation depends on the seriousness of the allegation.

3. Following a fair disciplinary process

Reasonable behaviour includes following a structured process consistent with the ACAS Code of Practice issued by ACAS.

A fair process typically involves:

• Informing the employee of allegations
• Providing evidence in advance
• Holding a disciplinary hearing
• Allowing the employee to respond
• Offering the right to be accompanied
• Providing a right of appeal

Failure to follow these steps may render dismissal unfair even if the reason is valid.

4. Considering the employee's explanation

A reasonable employer must genuinely consider:

• The employee's version of events
• Mitigating factors
• Alternative explanations
• Length of service and previous record

Ignoring relevant explanations can indicate procedural unfairness.

5. Consistency in decision-making

Consistency is an important aspect of reasonableness.

Employers should avoid:

• Treating similar cases differently without justification
• Applying disciplinary rules inconsistently
• Ignoring past precedents within the organisation

Inconsistent treatment can undermine fairness.

6. Proportionality of the decision

Even where misconduct is proven, dismissal must still be proportionate.

A reasonable employer will consider:

• Whether a warning would be sufficient
• Whether alternative sanctions are appropriate
• The severity of the misconduct
• The impact on the business

Dismissal should not be automatic unless justified by seriousness.

How Tribunals Assess Reasonable Employer Behaviour

The Employment Tribunal Employment Tribunal assesses behaviour based on the facts known to the employer at the time of dismissal, not with hindsight.

The tribunal considers:

• What information was available at the time
• Whether proper procedures were followed
• Whether the employer acted within a reasonable range of responses
• Whether dismissal was a proportionate outcome

The tribunal does not replace the employer's judgment with its own.

Examples of Reasonable vs Unreasonable Behaviour

Example of reasonable behaviour

An employee is accused of serious misconduct. The employer:

• Investigates thoroughly
• Holds a disciplinary hearing
• Allows the employee to present evidence
• Reviews all facts before deciding
• Issues dismissal only after confirmed findings

This is likely to be considered reasonable.

Example of unreasonable behaviour

An employee is dismissed immediately after an allegation without:

• Investigation
• Disciplinary hearing
• Opportunity to respond

Even if misconduct later appears likely, the process is unfair and outside the range of reasonable responses.

Reasonable Employer Behaviour in Different Types of Dismissal

Conduct cases

Focus on investigation, evidence, and proportionality.

Capability cases

Focus on performance reviews, training, and opportunities to improve.

Redundancy cases

Focus on fair selection criteria, consultation, and alternatives to dismissal.

SOSR (some other substantial reason)

Focus on justification and careful balancing of business needs and employee rights.

Role of ACAS Code in Reasonableness

The ACAS Code of Practice plays a major role in defining expected behaviour.

Tribunals may increase compensation by up to 25% if an employer unreasonably fails to follow the Code.

Key expectations include:

• Fair procedures
• Clear communication
• Proper investigation
• Right of appeal

Common Factors That Undermine Reasonable Behaviour

Employment Tribunals frequently find dismissals unfair where employers:

• Pre-judge the outcome
• Fail to investigate
• Ignore evidence from the employee
• Apply policies inconsistently
• Fail to consider alternatives to dismissal
• Conduct biased disciplinary hearings

These issues indicate behaviour outside the range of reasonableness.

Legal Consequences of Unreasonable Behaviour

If dismissal is found to be outside the range of reasonable responses, the tribunal may rule it unfair.

Possible outcomes include:

• Compensation for lost earnings
• Basic and compensatory awards
• Injury to feelings in related discrimination cases
• Reinstatement or re-engagement (rare)

Compensation is assessed under statutory rules in the Employment Rights Act 1996 Employment Rights Act 1996.

Key Takeaways

Reasonable employer behaviour in dismissal cases refers to the standard of conduct expected when making employment termination decisions. Under UK law, particularly the Employment Rights Act 1996 Employment Rights Act 1996, tribunals apply the “range of reasonable responses” test to determine fairness. Employers must act with proper investigation, fair procedure, consistency, and proportionality. Failure to meet these standards can result in a finding of unfair dismissal by the Employment Tribunal Employment Tribunal, often with financial compensation.