For example, in the case of the purchase of a used vehicle, provincial legislation often requires a bill of sale to register the vehicle to the new owner. You need a bill of sale. Are you selling an old car, motorcycle, or any other vehicle? The document paves the way for new ownership and would generally include the following information relative to the vehicle being sold: You will also need to either provide the buyer with your valid certificate of inspection (coi) or inform them they will need to have the vehicle inspected before they can register and insure it.