Though standard form bill of sales are available online and from your local county tax collector's office, it's also perfectly acceptable to write your own. You do need bill of sale.You may want to write up an extra thing that both of you sign to CYA but that's not for the DMV. On the Texas Certificate of Title, also known as Form 130-U, you must include a signature and the final sale price of your car for sale. This blog post is tailored to help you understand how to draft, why it's necessary, and where you can obtain a Texas bill of sale. The form consists of the significant vehicle, buyer, seller, and sale data, along with affirming signatures from both parties.