How much do car accident lawyers charge? If you've been injured due to another driver's negligence, the legal fees for handling your auto accident claim or lawsuit in Chicago, Illinois, will vary based on your case. Most car accident lawyers in Illinois operate on a contingency fee basis, meaning you only pay after receiving a settlement or compensation. However, some lawyers may require a flat fee or charge an hourly rate. It's important to carefully review the fee structure to ensure it fits your situation before hiring a lawyer.