An accident can cause injuries that prevent you from working. As a victim of an at-fault accident you are entitled to be placed in the same position, you would have been had the accident not occurred. As such, you are entitled to be compensated for any loss of income that is causally related to the accident, including time away from your job due to your inability to work or to attend medical appointments etc.
In addition, an accident may result in a complete disability preventing you from ever working in the same job or type of job you previously worked.
In order to best substantiate a loss of income claim, you should do the following: (1) ensure that your doctor ordered your time off through a prescription or written notation; (2) ensure that you obtain documentation from your employer indicating the time missed as well as a calculation of the monetary loss; and (3) obtain your tax returns for the years prior and after the accident to show the loss of income.
While the law entitles you to a claim for loss of income, it also requires proof of the loss.
If your injuries do prevent you from ever working in the same job or vocation, and the at-fault driver has assets or an automobile insurance policy substantial enough to adequately compensate such a loss, it may be advisable to retain an economic/vocational rehabilitation expert to testify on the full value of your loss.