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. This is the total of state, county, and city sales tax rates.If you are not registered for GST, make purchase order which will show all prices as GSTinclusive and make no mention of GST. This page is designed to provide small business owners and entrepreneurs with information they need to start or grow their business. If you sell your own goods only online , then requirement of GST registration depends on your turnover in a year. Complete list of Texas Comptroller Property Tax Forms and Applications click here. Texas Comptroller Property Tax Publications click here.