As you can see from the section on penalties above, the costs of a California DUI are nothing to sneeze at! Fines start at $390 for a first offense. However, fines are just the beginning of what you'll have to pay. There are also court costs, which will vary in amount based on where the incident occurred. Plus, if you have to have an ignition interlock device installed on your vehicle, you are required to pay for the device as well as its upkeep. There are also additional fees for court-ordered alcohol education programs, which vary depending on how long the program lasts.