Technically, you can sell a car with expired registration. However, the laws vary from one state to another. Therefore, it's a good idea to seek advice from the local DMV officials on what laws and procedures you'll have to follow before proceeding. It's also worth noting that upon selling a car with an expired registration, you'll likely need to supplement additional information to the buyer. Essentially, telling them that the registration tags have expired. Moreover, you'll likely have to surrender the title and prove that you are the vehicle's legal owner. Expired registrations may also have penalties that you'll have to pay.