Originally Posted by SeaJay
In New York, the ownership is based on the tags. It is similar in many other states. We sell a vehicle, keep our own tags, turn them into the department of motor vehicles and then cancel insurance coverage on the vehicle. It is up to the new owner to prove ownership with a transferred title and insurance coverage under his/her own name in order to obtain new plates. Then he/she is the new owner.
If you let the new owner drive off with your tags, you are opening yourself up to all kinds of potential liability and parking tickets. Keep your tags when you sell a vehicle, always!
Except not every state works that way. In Minnesota, the tags/plates belong to the vehicle - not the owner. The plates and registration are transferred with the title.
No idea what Texas laws for the OP are like - which is why unless its Texas specific advice, I'd take with a grain of salt.