A copy of the registered owner's valid U.S. State issued Driver License or Personal Identification Card or Federal Identification is required. Authorization Letter. TS-12.Pdf, Vehicle Specific Authorization Letter. VTR-270. You will need to apply using form AP-201, Texas Application (PDF). Office of Business Opportunity. Documents and Forms. A Letter of Authorization (LOA) must contain the following information: Letter must be on company letterhead. Authorization Letter – Form MV-454. The form must be filled out completely. Texas imposes a 6.25 percent state sales and use tax on all retail sales, leases and rentals of most goods, as well as taxable services.