Information and Instructions. • Submit this form within 30 days of the vehicle's date of transfer to help protect yourself from liability for criminal.How can I complete Dealer Transactions? Below, we've outlined the six steps and forms required for how to sell a car in the state of Texas so you can sell your car quickly for the most cash. Gather Required Documents: Collect essential documents, including the current vehicle title, a bill of sale, and proof of identity. This should include the sale date and odometer reading. Gather Required Documents: Collect essential documents, including the current vehicle title, a bill of sale, and proof of identity. A copy of the form is only available through an entity authorized to complete the form. This permit does NOT include commuity sales, food vending, car washes, or flea market sales. It is also used to calculate use tax on motor vehicles brought into Texas that were purchased from a private-party out of state.