In total, the IID can cost thousands of dollars over time. The ignition interlock device is a significant expense in third-time DUI cases. You will be responsible for the costs associated with installing and removing the device. However, you will also pay to have the IID maintained for years—possibly for up to 12 years (the 8-year suspension period and the 4 years after you get your license back). The company that installs your device will have to check it (every two months or so) to make sure it’s working properly and hasn’t been tampered with.