Is there a fine or can you car be impounded if driving with expired tags but registration is current?

If the registration card is current, and, it matches the tags on the car, you MAY get off with a warning but if not, the most you SHOULD receive is a ticket for 'displaying expired tags.' Unless something else is going on that is not disclosed in the question, (e.g.- the tags on the vehicle are NOT the tags assigned to it) they shouldn't be wanting to impound the vehicle .