In a personal injury lawsuit, plaintiffs are entitled to get compensation for the economic losses resulting from their injury including lost earnings. So if you’re not able to work for an extended time because of the injury, you are supposed to get money to compensate for the income you lost.
If you file a lawsuit and ask for lost earnings, you don’t simply tell the court how much you lost. Damages for lost earnings must be calculated based on evidence. If you are a W-2 employee with a salary, lost earnings calculation is easy. You just present documentation from your employer stating what your lost wages were. There may be a battle over whether the employee needed to take off work. But the calculation itself if very simple.