When Is Employment Expert Evidence Useful in an Employment Tribunal Claim?

Employment Tribunal claims can involve questions about past and future financial loss, earnings, benefits, pensions and potential changes in employment. Some calculations may be relatively straightforward, while others can involve multiple assumptions and different sources of financial evidence.

In appropriate cases, an employment loss expert may be instructed to analyse financial information and provide an independent opinion on matters within their area of expertise. Whether such evidence is appropriate will depend on the issues in the individual case, the evidence available and the requirements of the Tribunal.

This guide considers some of the circumstances in which an employment loss expert may be considered and the types of financial issues that may benefit from specialist analysis.

What Is Employment Expert Evidence?

Employment expert evidence is specialist opinion evidence concerning financial or economic issues arising in an employment dispute.

Depending on the scope of the instruction, an employment loss expert may consider matters such as:

• Past loss of earnings
• Future loss of earnings
• Employment benefits
• Bonus or commission arrangements
• Pension-related loss
• Alternative employment
• Career progression assumptions
• Residual earning capacity
• Different financial scenarios

The precise scope of any report will depend on the issues in dispute and the instructions given to the expert.

An expert's role is different from that of a factual witness. An appropriately instructed expert provides an independent opinion within their specialist area rather than acting as an advocate for either party.

When Might Employment Expert Evidence Be Considered?

There is no single type of employment claim in which an employment loss expert will automatically be required. The relevant question is whether specialist evidence may assist with an issue that falls within the expert's area of expertise and is relevant to the proceedings.

Several circumstances may make specialist financial evidence worth considering.

Where Future Loss Is in Dispute

Future loss of earnings can involve greater uncertainty than calculating earnings that have already been lost.

For example, an assessment may need to consider the claimant's earnings before the relevant events, their subsequent employment position and assumptions about future employment. The calculation may also need to take account of earnings from alternative employment where relevant.

An employment loss expert may help set out the financial assumptions used in a calculation and explain how different scenarios affect the figures.

Where Remuneration Is Not Straightforward

Some employment arrangements involve more than a fixed salary.

A claimant's remuneration may include:

• Annual bonuses
• Commission
• Overtime
• Allowances
• Benefits in kind
• Share-related arrangements
• Other variable remuneration

Where these elements are relevant to a claimed financial loss, specialist analysis may help organise the available evidence and explain the approach taken to the calculation.

The treatment of variable remuneration will depend on the terms of the employment arrangement and the evidence available in the individual case.

Where Pension Loss Is Relevant

Pension loss can involve issues that are separate from a straightforward salary calculation.

The appropriate approach may depend on the claimant's pension arrangements, employment history and the nature of the loss being considered. Different pension arrangements may also require different information and assumptions.

Where pension loss is a material issue, an appropriately instructed expert may provide a structured calculation and identify the assumptions on which it is based.

For more information about the wider range of issues considered in employment loss work, see the Employment Loss Expert Services.

Where Alternative Employment Needs to Be Considered

A claimant may have returned to work after leaving their previous employment. This can introduce additional issues when assessing financial loss.

Depending on the circumstances, the analysis may need to distinguish between:

• Earnings from the previous employment
• Earnings from subsequent employment
• Differences in remuneration
• The timing of alternative employment
• Potential future earnings
• Other relevant financial factors

An employment loss expert may present these figures within a structured calculation, subject to the evidence and assumptions available.

What May an Employment Loss Expert Help Analyse?

The appropriate role of an expert will depend on the instruction. In a case where specialist financial analysis is considered relevant, an expert report may help organise financial evidence and explain the methodology used.

Identifying Relevant Financial Information

An expert may identify financial and employment information that is relevant to the issues they have been asked to consider.

Depending on the circumstances, this could include:

• Payslips
• Year-end tax summaries and benefits-in-kind records
• Employment contracts
• Bonus or commission records
• Pension information
• Historical earnings
• Records of subsequent employment
• Information concerning benefits
• Evidence relating to career progression

The documents required will vary according to the nature and scope of the case.

Explaining Calculation Assumptions

Employment loss calculations can depend on assumptions about what might have happened if the relevant employment circumstances had been different.

An expert may set out those assumptions and show how they affect the calculation.

This can be relevant where there are several possible scenarios rather than a single straightforward calculation.

Presenting Alternative Scenarios

Where appropriate to the instruction, a report may contain more than one calculation.

For example, an expert may be asked to consider different assumptions concerning:

• The duration of future loss
• Alternative earnings
• Salary progression
• Bonus or commission
• Retirement timing
• Pension arrangements

Presenting scenarios separately can help identify which parts of a calculation depend on particular assumptions.

What Should Be Considered Before Relying on Expert Evidence?

Expert evidence in Employment Tribunal proceedings is subject to applicable procedural requirements and Tribunal directions. Depending on the circumstances, permission may be required before expert evidence is relied upon, and the Tribunal may determine the scope or manner in which such evidence is provided.

The decision to instruct an expert should therefore be considered in the context of the issues in the proceedings rather than simply on the basis that a financial loss has been claimed.

It may be useful to consider:

• What financial issue needs to be addressed?
• Is the issue within an expert's area of expertise?
• What evidence is already available?
• Are the relevant figures disputed?
• Does the calculation involve significant assumptions or alternative scenarios?
• What do the applicable Tribunal directions require?

When Might an Expert Report Be Less Relevant?

Not every employment loss issue requires specialist expert evidence.

A relatively simple calculation based on undisputed salary information may not require the same level of analysis as a complex future loss claim involving variable remuneration, pension arrangements or competing employment scenarios.

Similarly, obtaining an expert report may be less relevant where the financial issue can be addressed adequately through documentary evidence and straightforward calculations.

The appropriateness of expert evidence should therefore be considered on the facts of the individual case and in light of the issues that the Tribunal needs to determine.

What Should Solicitors Consider Before Instructing an Employment Loss Expert?

Before an instruction is made, it can be useful to identify the specific financial question that the expert is being asked to address.

Define the Question

The instruction should explain the financial issue that requires specialist consideration.

For example, this might concern:

• Future loss of earnings
• Pension loss
• Variable remuneration
• Alternative employment
• Career progression
• Residual earning capacity

A clearly defined question may help keep the scope of the report focused on the relevant issue.

Identify the Available Evidence

The expert will generally need sufficient financial and employment information to understand the position being assessed.

It may therefore be useful to establish what documents are available and whether important information remains outstanding.

The information required will depend on the subject matter of the instruction.

Consider Areas of Disagreement

If the parties have different approaches to the calculation, the instruction may identify the areas requiring analysis.

These could include disagreement concerning:

• The appropriate earnings figure
• The period of future loss
• Alternative employment
• Career progression
• Variable remuneration
• Pension assumptions
• Other financial assumptions

An expert may then address those issues within the scope of their expertise and instructions.

How May an Employment Loss Report Assist?

An employment loss report may provide a structured analysis of financial issues within the scope of the expert's instructions.

Depending on the circumstances, it may assist by:

1. Setting out relevant financial information.
2. Explaining the methodology used.
3. Identifying important assumptions.
4. Presenting the calculations.
5. Distinguishing factual information from expert opinion.
6. Showing where figures depend on particular scenarios or assumptions.

The report does not determine the legal issues in the case. Its purpose is to provide expert opinion on matters falling within the expert's specialist knowledge.

Employment Loss Expert Evidence in Different Types of Cases

The financial issues requiring consideration can vary considerably between cases.

Employment loss calculations may arise in matters involving employment termination, discrimination, contractual disputes or other proceedings where financial loss is relevant.

The nature of the underlying claim does not, by itself, determine whether expert evidence is appropriate. The specific financial issues and the evidence available should be considered separately.

Where the calculation involves more complex questions concerning earnings, pensions, future employment or other financial consequences, specialist analysis may be considered as part of the overall evidence.

Conclusion

Employment expert evidence may be considered where an Employment Tribunal claim involves financial issues that require specialist analysis beyond a straightforward calculation.

It may be relevant where a case involves future loss of earnings, complex remuneration, pension arrangements, alternative employment or different assumptions about future earnings.

The appropriate approach will depend on the facts of the case, the evidence available and the procedural requirements applicable to the proceedings. Before instructing an employment loss expert, it is therefore useful to identify the specific financial question, consider whether specialist evidence may be reasonably required and define the proposed scope of the instruction clearly.

For an overview of the areas in which employment loss experts may provide specialist financial analysis, see the Employment Loss Expert Services.

Disclaimer: This article provides general information about employment expert evidence and is not legal advice. The relevance, scope and procedural treatment of expert evidence will depend on the circumstances and requirements of the individual case. Last Reviewed: September 2026