Unlike the award for the injury itself, a loss of earnings claim is proved with documents. That is good news in one sense, because documents are objective, but it also means the claim is only as strong as the paperwork behind it. The more carefully the loss is recorded, the easier it is to establish and the harder it is for an insurer to argue with.
Start with what you actually lost. Payslips, P60s, contracts and bank statements show what you were earning. Where overtime, commission or bonuses formed a regular part of your income, evidence of that pattern matters, because an insurer will otherwise treat the loss as limited to basic pay. A letter from your employer confirming the dates of absence, any reduction in hours or a change of duties is often valuable.
Where the loss continues into the future, or where the figures are not straightforward, a solicitor will often instruct an accountant to prepare a report. For the self employed, that report may be essential, because it translates business accounts into a clear statement of what the individual has lost and is likely to lose. Where the claim involves a long period of lost earnings or a pension, actuarial evidence may follow.
It is worth keeping your own record as well. A simple note of the days you could not work, the shifts you turned down, and the jobs you could no longer take because of the injury will help your solicitor build an accurate picture. Memory fades, and these details are much harder to reconstruct a year or two later.