Polkey Reduction Definition in Employment Law (Employment Tribunals)

A Polkey reduction is a principle used by Employment Tribunals in unfair dismissal claims to reduce compensation where the tribunal finds that the employee would have been dismissed in any event, even if the employer had followed a fair procedure.

The rule originates from the House of Lords decision in Polkey v A E Dayton Services Ltd [1987] UKHL 8, which established that compensation for unfair dismissal can be reduced to reflect the likelihood that dismissal would have occurred lawfully.

This principle is a key feature of Employment Tribunal compensation assessment and is frequently applied in cases involving procedural unfairness.

What Is a Polkey Reduction?

A Polkey reduction is a percentage reduction applied to an unfair dismissal compensatory award to reflect the chance that the employee would have been dismissed anyway, even if the employer had acted fairly.

It does not remove liability for unfair dismissal. Instead, it reduces the amount of compensation payable.

In simple terms:

• The tribunal finds dismissal was unfair (procedurally or substantively)
• The tribunal considers what would have happened if a fair process had been followed
• The compensation is reduced to reflect the probability of dismissal in any event

Legal Basis: Polkey v A E Dayton Services Ltd

The principle comes from the case Polkey v A E Dayton Services Ltd [1987] UKHL 8, where the House of Lords held that:

• Even if dismissal is procedurally unfair, compensation should reflect what would have happened if proper procedures had been followed
• Tribunals must assess the likelihood of the same outcome occurring fairly

This case significantly changed unfair dismissal law by separating:

• The fairness of the procedure
• The likely outcome if a fair procedure had been used

When Is a Polkey Reduction Applied?

A Polkey reduction is usually considered in unfair dismissal claims where:

• The employer failed to follow a fair disciplinary or dismissal procedure
• The tribunal finds dismissal was still likely on substantive grounds
• Evidence shows misconduct, poor performance, or redundancy would still have led to dismissal
• Procedural defects are the main reason for unfairness

It is not applied automatically and depends on tribunal findings based on evidence.

How Tribunals Decide the Reduction

Tribunals assess the likelihood of dismissal had a fair process been followed.

This involves a fact-specific evaluation, including:

1. Strength of the employer's case

• Seriousness of misconduct
• Evidence of performance issues
• Redundancy rationale

2. Procedural fairness

• Whether investigation was adequate
• Whether a disciplinary hearing would have changed the outcome
• Whether warnings or consultation would have made a difference

3. Hypothetical outcome assessment

Tribunals estimate probabilities, such as:

• 0% chance of dismissal (no reduction)
• 25% chance of dismissal (75% reduction in compensation)
• 50% or higher chance of dismissal

4. Quality of evidence

The tribunal relies on documents, witness evidence, and workplace records to assess likely outcomes.

Example of a Polkey Reduction

A simplified example:

• An employee is unfairly dismissed without a proper disciplinary hearing
• The tribunal finds the procedure was unfair
• However, evidence shows strong misconduct that would likely have led to dismissal after a fair hearing

The tribunal may conclude:

• There was a 75% chance the employee would have been dismissed anyway
• Compensation is reduced by 75%
• The claimant receives only 25% of the compensatory award

Polkey Reduction vs Contributory Fault

These are separate legal concepts and often confused.

Polkey Reduction

• Focuses on what would have happened if a fair process had been followed
• Based on hypothetical outcome
• Applies even where employee did nothing wrong procedurally

Contributory Fault

• Focuses on employee's conduct
• Applies where employee contributed to dismissal (e.g. misconduct)
• Reduces compensation based on blameworthy behaviour

Both can apply in the same case.

Polkey Reduction and Procedural Unfairness

Polkey reductions are most commonly used in cases involving procedural unfairness, such as:

• Failure to conduct a disciplinary hearing
• Lack of investigation
• No right of appeal
• Failure to follow internal policies
• Insufficient consultation in redundancy

However, even serious procedural failings may still result in a reduced award if dismissal would have happened regardless.

Impact on Employment Tribunal Compensation

A Polkey reduction affects the compensatory award in unfair dismissal claims.

It does not affect:

• The basic award
• Findings of unfair dismissal
• Liability determination

It only reduces the financial compensation for loss of earnings and related losses.

Interaction with Mitigation and Other Adjustments

A Polkey reduction is applied alongside other compensation adjustments, including:

1. Mitigation of loss

Deduction for earnings received or reasonably obtainable after dismissal.

2. ACAS uplift or reduction

Adjustment of up to 25% for failure to follow the ACAS Code of Practice.

3. Contributory fault reduction

Reduction based on employee conduct.

Tribunals apply these sequentially when calculating final awards.

No Automatic Reduction Rule

A key principle is that there is no automatic Polkey percentage.

Tribunals must:

• Make a reasoned assessment
• Base findings on evidence, not assumption
• Avoid speculation unsupported by facts

Where evidence is insufficient, tribunals may decline to apply a reduction.

Common Misunderstandings

“Unfair dismissal always means full compensation”

Incorrect. Compensation can be significantly reduced if dismissal would likely have occurred anyway.

“Procedural unfairness guarantees full payout”

Incorrect. Even serious procedural flaws may result in reduced compensation.

“Polkey means the employer is found partly right”

Incorrect. The dismissal can still be unfair; reduction only affects compensation.

Practical Importance in Tribunal Cases

Polkey arguments are frequently central in:

• Disciplinary dismissal cases
• Performance management disputes
• Redundancy consultations
• Misconduct allegations

Parties often focus heavily on:

• What would have happened in a fair process
• Whether dismissal was inevitable
• Quality of employer evidence

This can significantly affect compensation outcomes.

Key Takeaways

A Polkey reduction is a legal principle used in Employment Tribunals to reduce compensation in unfair dismissal cases where the employee would have been dismissed even if a fair procedure had been followed.

Derived from Polkey v A E Dayton Services Ltd [1987], it requires tribunals to assess the likely outcome of a fair disciplinary process and adjust compensation accordingly. It operates independently from findings of unfair dismissal and is applied only to the compensatory award.

The size of the reduction depends on evidence, probability, and the strength of the employer's case, and it often plays a major role in determining final compensation levels.