If your vehicle's NSW registration has expired but it's within 3 months of the expiry date, you're still able to renew the registration. The vehicle will be registered from the day you make the renewal payment, but there'll be no extension of the expiry date.
If the registration expired more than 3 months ago, you'll need to re-register the vehicle.
Note: If an unregistered vehicle is parked on a road or road related area and the registration is more than 15 days overdue, the Police can seize the number plates. In this instance also, the vehicle will need to be re-registered.Find a service centre