If you have not done all the below you owe the money:
Change of ownership
If you have sold or purchased a vehicle already registered, remember to make the change of ownership of the vehicle in the register of the General Directorate of Traffic. In the next steps will explain how you should act and paperwork to do.
If you sell your vehicle always remember the following tips:
a) Never give the vehicle without having in your hands the contract of sale or a copy of it (if owner) or invoice (if you give it to a sale) and a photocopy of the identity document of the purchaser in Spain (ID / Resident Card, if they are individuals, or CIF, if companies). If it is a sale, shall state the VAT number on the invoice. It is important to indicate in the contract the hour and minute when the vehicle deliveries: remember that fines fixed speed cameras and have failed an MOT you will keep coming as long as there is no vehicle in the register the change of ownership.
b) Tell the buyer within 15 days you send a copy of the registration certificate stating that the vehicle is already in your name. If you have not received this document within 15 days, go to the Traffic Department to communicate that you sold the vehicle (pending notification of sale).
If you purchased a vehicle, you must register it to your name in the Register of Vehicles Traffic Department.
a) If you purchased the vehicle in a sale, it is this that is normally responsible for carrying out the management, making delivery of the card Vehicle Technical Inspection and the registration certificate and your name.
b) If you purchased the vehicle from a private, remember to stay with the contract of sale or a photocopy of a photocopy of the identity of the seller, the request for change of ownership of the vehicle signed by buyer and seller, and the vehicle documents (ITV card, driving license and municipal tax paid receipt for the year prior to proceeding), (vehicle transmission process).
Then you must perform the following steps:
1. - Pay the transfer tax (model 620) to finance your Autonomous Community, providing all the above documentation. This procedure can to effect by Internet if your tax home is in Andalusia, Aragon, Asturias, Castilla y Leon, Catalonia, Balearic Islands, Madrid and Murcia. In this case you will get a code Electronic Transfers (CET) that will serve to demonstrate that you have fulfilled your tax liability.
Two. - Go to any of these three Traffic Headquarters: that of your domicile, the domicile of the seller or the vehicle registration province.
Three. - Pay the fees and provide all necessary documentation to perform the procedure (information note from the documentation).