What information do I need to complete a bill of sale? This form below is designed for use on upon the sale of a motor vehicle or automobile.Such a bill of sale is needed to confirm a party's ownership in the car. Payment Agreement Terms. Payment agreements may be available to customers whose property is to be included in an upcoming Lien Sale. The bill of sale must show the purchase price and the amount of out-of-state sales tax paid to the dealer. In many cases, yes, a bill of sale can be used as a contract depending on the circumstances. However, there could be other elements that are also required. Each party shall pay its own legal costs. 9.21. The court has placed the most commonly used forms on line as a resource.