It contains information about the buyer and the seller, a description of the vehicle being sold, and information about the transaction, such as price. Download forms from the Tax Assessor-Collector's office.How to fill out the Texas Vehicle Bill of Sale Form? Motor Vehicle (DMV) Bill of Sale Form – Conveys the purchase and transfer of an automobile. All "Component Parts" listed on this form must be from the same vehicle and sold to an individual purchaser. Complete list of Texas Comptroller Property Tax Forms and Applications click here. Texas Comptroller Property Tax Publications click here. Information. All sections of this form must be properly completed in order for this document to be accepted. Original signatures are. This statement is filed together with an amount equal to the total amount of the unit property tax assigned to all motor vehicles sold in the preceding month.