Lawyers usually set the price of a contingency fee as a percentage of the final amount. The percentage varies from lawyer to lawyer and on the complexity of your case. Your rate may go up or down depending on how your case goes. For example, there is usually a raise in the rate if your case must go to trial. The ethics laws set by state bar organizations require lawyers to only charge “reasonable” fees. Ranges for contingency fees can be as low as 25% and as high as 50%. The most common percentage is somewhere in the 30s.