How Financial Loss Experts Deal With Incomplete or Missing Financial Records in Negligence Claims

Financial loss calculations can depend on records showing earnings, employment benefits, business performance, expenses, investments, or other financial circumstances. In a negligence claim, however, the available financial records may not always provide a complete picture.

Records may be missing, incomplete, inconsistent, or unavailable for various reasons. This can make a financial loss assessment more difficult, particularly where the expert is asked to consider what the claimant's financial position might have been if the alleged negligence had not occurred.

A financial loss expert may therefore need to identify limitations in the available evidence, consider other relevant sources of information, and explain how those limitations affect the calculation. The appropriate approach will depend on the circumstances of the particular case and the evidence available.

Why Financial Records May Be Incomplete

There are various reasons why financial information may not be available in full.

For example, records may have been:

• lost or destroyed
• retained by a former employer or business
• unavailable because a business has ceased trading
• affected by changes in accounting systems
• incomplete for earlier periods
• held across several different sources
• unavailable because certain financial activity was not formally recorded

In some cases, records may exist but require clarification. Different documents may also show different figures because they were prepared for different purposes or cover different periods.

A financial loss assessment therefore needs to take the nature and limitations of the available evidence into account rather than assuming that one document necessarily provides a complete picture.

Identifying the Available Financial Evidence

An assessment may begin by establishing what financial evidence is available and which periods it covers.

The relevant evidence will depend on the type of negligence claim and the financial issues being considered. It may include employment records, tax documents, accounting records, bank statements, business records, or other supporting material.

Employment Records

Potentially relevant employment documents may include payslips, P60s, P45s, employment contracts, payroll records, bonus statements, and records of employment benefits.

These documents may help establish historical earnings and the terms of an employment arrangement, subject to their completeness and relevance.

Tax and Accounting Records

Tax returns, company accounts, management accounts, accounting records, and other financial documents may provide information about income and expenditure.

The relevance of each document can depend on the period covered, how the figures were prepared, and the particular issue being assessed.

Bank and Financial Records

Bank statements and other financial records may provide additional information where formal payroll or accounting records are incomplete.

They may also help identify patterns of income or expenditure that are not immediately apparent from other documents. Their usefulness will depend on the information they contain and the issues being considered.

Business Records

For a business owner or self-employed claimant, potentially relevant evidence may include invoices, accounts, sales records, contracts, business expenses, customer records, and other trading information.

Where business records are incomplete, the available material may need to be considered alongside other evidence rather than treated in isolation.

Considering Alternative Sources of Evidence

Where a particular financial record is missing, other evidence may sometimes provide useful information.

For example, if historic payroll records are unavailable, other employment documentation, tax information, bank records, or information from an employer may be relevant.

Similarly, where detailed business records are unavailable, other financial information may sometimes help indicate the level and pattern of trading activity.

Alternative evidence does not automatically replace missing records. Its usefulness will depend on its reliability, relevance, completeness, and relationship to the financial issue being assessed.

Dealing With Gaps in Historical Earnings Information

Historical earnings may be relevant when considering a claimant's financial position before the alleged negligence.

A gap in the records can make it more difficult to establish a complete earnings history. Depending on the evidence available, an expert may need to consider information from periods before and after the gap.

The available evidence might include:

• earnings for earlier periods
• earnings recorded after the missing period
• changes in employment
• changes in working hours
• periods of unemployment
• changes in remuneration
• other circumstances that may have affected income

The purpose is not necessarily to replace every missing figure with an assumed amount. Instead, the available evidence can be assessed to determine what information it may reasonably support and where limitations remain.

When Different Records Do Not Match

Financial records can sometimes contain apparently inconsistent figures.

For example, figures in tax records may differ from figures in management accounts, payroll records, or bank statements. Such differences do not necessarily establish that one set of records is incorrect.

The documents may have different accounting periods, definitions, or purposes.

A financial loss expert may therefore need to consider why the figures differ before deciding whether and how they should be used in a loss calculation.

Where an inconsistency cannot be resolved from the available evidence, it may be appropriate to identify the issue and explain its significance rather than presenting an uncertain figure as established fact.

Using Assumptions Where Evidence Is Incomplete

A financial loss calculation may sometimes require assumptions where the available evidence does not provide a definitive answer.

An assumption should be distinguishable from an established fact and should have an identifiable basis in the available evidence or instructions.

For example, if the evidence does not establish exactly how earnings would have developed over a particular period, different scenarios may need to be considered rather than presenting one uncertain outcome as certain.

The assumptions used should be explained clearly so that the reader can understand their relevance to the calculation.

Considering the Counterfactual Position

A negligence claim may involve consideration of what the claimant's financial position might have been if the alleged negligence had not occurred. This is commonly referred to as the counterfactual position.

Incomplete financial records can make this exercise more difficult because historical evidence may not provide a complete basis for considering an alternative financial outcome.

Depending on the circumstances, potentially relevant evidence may include:

• previous earnings
• employment history
• business performance
• contractual arrangements
• career progression
• information about planned changes
• other evidence relevant to the financial position

The weight given to each source will depend on the facts and evidence of the particular case.

The role of the financial expert is to analyse the financial evidence and explain the basis of the calculation. The expert does not necessarily resolve disputed questions of liability or other factual matters outside the scope of the financial analysis.

Using Scenarios Where the Evidence Is Uncertain

Where there is material uncertainty, scenario analysis may provide a way of showing how different assumptions affect a financial loss calculation.

For example, an assessment might consider different assumptions about future earnings, working patterns, employment arrangements, or business performance.

Presenting alternative scenarios can make the effect of particular assumptions more transparent than relying on a single calculation without explaining the uncertainty behind it.

Scenario analysis does not remove uncertainty. It can instead show how the calculation changes when relevant assumptions are varied.

Avoiding Double Counting

Incomplete or inconsistent records can also create a risk that the same financial effect is included more than once.

For example, several documents may contain overlapping information about income or expenditure. Before incorporating figures into a loss calculation, it may therefore be necessary to understand what each figure represents and which period it covers.

Reconciliation of the available evidence may help identify duplication, inconsistencies, or differences in the way figures have been recorded.

Explaining Limitations in the Expert Report

Where important financial records are unavailable, the limitation may need to be addressed clearly in the expert evidence.

Depending on the circumstances, a report may explain:

1. what information was available
2. what information was missing
3. how the missing information affects the assessment
4. what alternative evidence was considered
5. what assumptions have been used
6. how those assumptions affect the calculation

The significance of a missing record will vary between cases. A missing document may have limited relevance in one matter but may affect an important part of the financial assessment in another.

A clear explanation of the evidence and its limitations can help the reader understand which parts of the calculation are supported by documented information and which depend on assumptions or other evidence.

What Solicitors Can Consider When Records Are Missing

Where financial records are incomplete, it may be useful for the legal team to identify the gaps while the case is being prepared.

Depending on the circumstances, the legal team may consider:

• identifying the specific periods for which records are missing
• checking whether copies may be available from another source
• obtaining clarification from employers, accountants, or other relevant parties where appropriate
• distinguishing factual evidence from assumptions
• identifying areas where the financial calculation remains uncertain
• providing the financial expert with relevant contextual information alongside the available records

The precise evidence required will depend on the nature of the negligence claim and the financial issues that need to be considered.

A Structured Approach to Incomplete Financial Evidence

Missing or incomplete financial records do not necessarily prevent a financial loss assessment. They can, however, affect the evidence available to the expert and the approach taken to the calculation.

A financial loss assessment should distinguish, where appropriate, between documented financial information, supporting evidence, assumptions, and areas where the available material does not permit a firm conclusion.

Identifying information gaps at an early stage may help clarify what evidence is available and whether further information may be relevant to the financial issues in dispute.

A financial loss expert can then assess the available evidence within the scope of the instruction, explain material limitations, and present the resulting calculations and assumptions clearly.

For further information about financial loss assessments and related expert evidence, see the relevant financial loss services and FAQ sections of this website.

Disclaimer: This article is provided for general information only. It does not constitute legal, accounting, or financial advice and does not address the circumstances or evidence of any particular claim. Last Reviewed: September 2026