Texas Sales Tax Free Weekend 2012. It's that time of year again for the State of Texas to have it's "Sales Tax Holiday", Aug. 17 (Fri.), 18 (Sat.), and 19th (Sun.). Are you new to Texas, and haven't heard about this weekend? It happens one weekend a year right before school starts and applies mostly to clothes and school supplies priced under $100. Local and state sales tax will not be collected on certain back-to-school items. I happened to go out on one of these weekends (10 comments)