Enter the total amount of taxable purchases that you made for your own use. Completing a Texas sales tax return is a threestep process.Our free online guide for business owners covers Texas sales tax registration, collecting, filing, due dates, nexus obligations, and more. The sales tax to the state is 6.25 each locality adds to that amount so for most of us the full sales tax is 8.25 it's based on where you're doing business These documents provide insight into the company's financial performance, tax compliance, debt obligations, and overall financial stability.