What is Burden of Proof in Unfair Dismissal Cases?

In unfair dismissal claims before employment tribunals in England and Wales, the “burden of proof” refers to which party is responsible for proving key facts in the case. It determines who must present evidence to support their version of events and to what standard those facts must be proven.

Unfair dismissal cases are governed primarily by the Employment Rights Act 1996. While tribunals take a flexible approach to procedure, the burden of proof plays a central role in deciding whether a dismissal was fair or unfair and whether the employer acted lawfully.

This article explains how the burden of proof works in unfair dismissal cases, how it shifts between the parties, and what it means in practical terms for claimants and employers.

Meaning of Burden of Proof in Employment Law

The burden of proof is the legal obligation to prove facts necessary to win a case. In unfair dismissal claims, it is not fixed on one party throughout the hearing. Instead, it shifts depending on the issue being considered.

There are two key concepts:

• Legal burden: the obligation to prove a case overall
• Evidential burden: the obligation to produce enough evidence to support a claim or defence

Employment tribunals apply a structured approach based on these principles, although they are not bound by strict rules of evidence like criminal courts.

Overall Burden in Unfair Dismissal Claims

In most unfair dismissal cases:

• The employee must first establish that a dismissal occurred
• The employer must then prove the reason for dismissal was potentially fair
• The tribunal then assesses whether the dismissal was reasonable in all the circumstances

This creates a shifting burden between the parties.

Step 1: Employee Must Show a Dismissal Took Place

The initial burden lies with the employee to prove:

• They were dismissed (not resigned voluntarily or through mutual agreement)
• The date and circumstances of dismissal
• Basic facts supporting the claim

Once dismissal is established, the legal analysis moves to the employer.

Step 2: Employer Must Prove the Reason for Dismissal

Under the Employment Rights Act 1996, the employer carries the burden of proving the “principal reason” for dismissal.

The employer must show that the dismissal was for a potentially fair reason, such as:

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

If the employer cannot prove the reason for dismissal, the tribunal is likely to find it unfair.

Step 3: Tribunal Assesses Fairness of the Dismissal

Even if the employer proves a potentially fair reason, the burden then shifts again in practice to the tribunal's assessment stage.

The tribunal considers whether the employer acted reasonably, including:

• Whether a fair investigation was carried out
• Whether a fair disciplinary process was followed
• Whether dismissal was within the range of reasonable responses
• Whether alternatives to dismissal were considered

At this stage, both parties must present evidence supporting their position.

Burden of Proof in Discrimination Elements Linked to Dismissal

Where an unfair dismissal claim overlaps with discrimination allegations, a different burden structure applies under the Equality Act 2010.

In discrimination-related dismissal claims:

• The employee must establish facts suggesting discrimination may have occurred
• If established, the burden shifts to the employer to prove there was no discrimination

This is often referred to as the “burden shifting” approach in discrimination law and is separate from the unfair dismissal test.

Burden of Proof in Automatically Unfair Dismissal Claims

In cases involving automatically unfair dismissal, such as whistleblowing or pregnancy-related dismissal:

• The employee must provide evidence that the dismissal was linked to a protected reason
• Once this is shown, the burden shifts heavily onto the employer to disprove that connection

If the protected reason is established as the principal cause, the dismissal is automatically unfair regardless of procedure or conduct.

Standard of Proof in Tribunal Cases

The standard of proof in unfair dismissal cases is the “balance of probabilities”.

This means:

• A fact is proven if it is more likely than not to be true
• There is no requirement for certainty
• The tribunal weighs competing evidence and decides which version is more probable

This is a lower threshold than the criminal standard of “beyond reasonable doubt”.

How Evidence Relates to the Burden of Proof

The burden of proof is closely linked to evidence presented during the case. Each party must provide material to support their arguments, such as:

For employees:

• Employment contracts
• Emails or messages showing treatment by employer
• Witness statements
• Disciplinary documentation

For employers:

• Investigation reports
• Disciplinary records
• Performance reviews
• HR policies and procedures

The strength of evidence often determines whether the burden has been discharged.

Shifting Burden in Practice

Unfair dismissal hearings typically involve a structured sequence:

1. Employee proves dismissal occurred
2. Employer proves reason for dismissal
3. Tribunal assesses fairness
4. If applicable, burden shifts for discrimination or whistleblowing elements

This dynamic structure is central to how tribunals reach decisions.

Failure to Discharge the Burden of Proof

If a party fails to meet its burden:

For employers:

• Failure to prove a fair reason may result in a finding of unfair dismissal

For employees:

• Failure to provide evidence of dismissal or protected reason may lead to the claim failing

Tribunals do not assume facts; they rely on evidence presented.

Common Misunderstandings

“The employee must prove the dismissal was unfair”

Incorrect. The employer must justify the dismissal once it is established.

“The tribunal decides based on fairness alone”

Tribunals apply legal tests, not subjective fairness alone.

“The burden never shifts”

In fact, burden shifting is a core feature of unfair dismissal and discrimination claims.

Practical Importance of Burden of Proof

Understanding burden of proof is important because it affects:

• How evidence should be prepared
• What must be proven at each stage
• The likelihood of success in tribunal proceedings
• Strategic presentation of witness testimony and documents

It determines the structure of the entire case.

Final Thoughts

The burden of proof in unfair dismissal cases defines which party must prove key facts at each stage of an employment tribunal hearing. While the employee must first establish that dismissal occurred, the employer must then justify the reason and fairness of the dismissal under the Employment Rights Act 1996.

The burden is not fixed and shifts depending on the legal issue being considered, particularly in cases involving discrimination or automatically unfair dismissal. Ultimately, tribunals decide cases based on the balance of probabilities, weighing all evidence before reaching a conclusion.