Mitigation of Loss Principle in Employment Tribunal Claims

The mitigation of loss principle is a fundamental rule in Employment Tribunal compensation claims in England and Wales. It requires a claimant who has been dismissed or suffered unlawful treatment to take reasonable steps to reduce their financial loss.

In practical terms, this means that a claimant cannot simply remain unemployed and claim full lost earnings indefinitely. Instead, tribunals expect active efforts to find alternative work or otherwise reduce financial harm.

The principle applies across unfair dismissal, discrimination, whistleblowing, and unlawful deduction of wages claims where financial loss is being assessed.

What Is the Mitigation of Loss Principle?

Mitigation of loss is a legal principle requiring a claimant to take reasonable steps to minimise financial damage caused by an employer's unlawful conduct.

In Employment Tribunals, it means:

• A claimant must actively look for suitable alternative employment
• Any income earned after dismissal is deducted from compensation
• Failure to take reasonable steps can reduce or eliminate financial awards

The principle does not require perfection. It requires reasonableness.

Legal Basis for Mitigation in Employment Law

The mitigation principle is derived from general principles of English contract law and applied in Employment Tribunal compensation assessment.

It is reflected in:

• Employment Rights Act 1996 (compensatory award principles)
• Equality Act 2010 (loss-based compensation in discrimination claims)
• Established case law on “reasonable steps” to reduce loss
• Tribunal practice and guidance on remedy hearings

The underlying rule is that compensation should reflect actual loss, not avoidable loss.

What Counts as Reasonable Mitigation?

Tribunals assess whether a claimant has taken reasonable steps based on their individual circumstances.

Reasonable mitigation typically includes:

1. Actively seeking work

• Applying for jobs
• Registering with recruitment agencies
• Attending interviews

2. Expanding job search scope

• Considering different roles or sectors
• Accepting temporary or lower-paid work where appropriate
• Using online job platforms

3. Maintaining employability

• Updating CVs
• Completing relevant training
• Maintaining professional registration where applicable

4. Accepting suitable employment

Tribunals expect claimants to accept reasonable job offers, even if:

• Pay is lower than previous employment
• Role is slightly different
• Location or conditions are less favourable (within reason)

What Is Not Required for Mitigation

The law does not require unreasonable or excessive steps.

Claimants are not expected to:

• Accept unsuitable employment
• Move to a different region without justification
• Take roles that are clearly below their skills or qualifications in an unreasonable way
• Accept unsafe or exploitative working conditions

Tribunals balance reasonableness against personal circumstances.

How Tribunals Assess Mitigation Efforts

Employment Tribunals examine mitigation on a case-by-case basis.

Key factors include:

1. Job search evidence

• Number of applications
• Types of roles applied for
• Frequency and consistency of search activity

2. Availability for work

• Whether the claimant was genuinely available for employment
• Any restrictions (health, childcare, immigration status)

3. Market conditions

• Availability of jobs in the claimant's field
• Economic conditions affecting recruitment

4. Personal circumstances

• Age and experience
• Skills and qualifications
• Health conditions affecting work capacity

5. Reasonableness of conduct

Tribunals focus on whether a reasonable person in the claimant's position would have acted similarly.

Impact of Failure to Mitigate Loss

If a tribunal finds that a claimant has failed to mitigate loss, it may:

• Reduce compensation
• Limit the period of recoverable loss
• Assume notional earnings could have been achieved
• In some cases, eliminate ongoing loss claims

The reduction is based on what the claimant should reasonably have earned.

Example of Mitigation Assessment

Example scenario

• Employee is unfairly dismissed
• Remains unemployed for 12 months
• Only applies for a small number of roles

Tribunal assessment

• Tribunal finds reasonable job search should have led to employment after 4 months
• Compensation reduced accordingly
• Earnings from deemed employment are deducted

Result: loss period shortened due to inadequate mitigation.

Actual Earnings vs Notional Earnings

Tribunals distinguish between:

Actual earnings

Income actually received after dismissal, which is deducted from compensation.

Notional earnings

Income the claimant could reasonably have earned if proper mitigation steps were taken.

If a claimant fails to mitigate, tribunals may substitute notional earnings.

Mitigation in Different Types of Claims

Unfair dismissal claims

Mitigation is central to compensatory award calculation and future loss assessment.

Discrimination claims

Mitigation applies to financial loss but not to injury to feelings awards.

Whistleblowing claims

Mitigation applies to uncapped compensation for financial loss.

Wage claims

Mitigation is less relevant where fixed arrears of pay are owed.

Burden of Proof

The burden of proving a failure to mitigate rests with the employer.

Employers must show that:

• The claimant failed to take reasonable steps
• Suitable employment was available
• The claimant would likely have obtained work if they had acted reasonably

Claimants are not required to prove perfect job search activity, but should be able to demonstrate reasonable efforts.

Evidence Used in Mitigation Disputes

Tribunals consider:

• Job application records
• CVs and cover letters
• Emails with recruiters
• LinkedIn activity or job search logs
• Witness statements from claimant and employer
• Labour market evidence

Clear documentation of job search activity is often decisive.

Interaction with Other Compensation Principles

Mitigation operates alongside other adjustments, including:

1. Polkey reduction

Reduces compensation if dismissal would have occurred anyway.

2. Contributory fault

Reduces compensation due to claimant's blameworthy conduct.

3. ACAS uplift or reduction

Adjusts compensation for procedural compliance issues.

These principles can significantly affect final awards when combined.

Common Misunderstandings

“Claimants must accept any job offered”

Incorrect. Only reasonable and suitable employment must be accepted.

“No job search means automatic loss of compensation”

Incorrect. It may lead to reduction, but tribunals assess reasonableness.

“Mitigation requires identical replacement job”

Incorrect. Tribunals consider the broader labour market.

Practical Importance in Tribunal Cases

Mitigation is often a central issue in remedy hearings because it directly affects compensation levels.

Claimants are expected to demonstrate:

• Consistent job search activity
• Willingness to re-enter employment
• Reasonable flexibility in job choices

Employers frequently challenge mitigation to reduce compensation exposure.

Key Takeaways

The mitigation of loss principle in Employment Tribunal claims requires claimants to take reasonable steps to reduce financial loss following dismissal or unlawful treatment. Compensation is limited to losses that could not reasonably have been avoided.

Tribunals assess job search efforts, availability for work, and personal circumstances to determine whether mitigation has been adequate. Failure to mitigate can significantly reduce compensation by introducing notional earnings or shortening the loss period.

The principle ensures fairness by balancing employer liability with claimant responsibility to minimise financial damage.