It is Sales Tax Holiday Weekend in Missouri and here is some of the information you need to know. In Missouri, the sales tax holiday begins on the first Friday in August and continues through the following Sunday. Certain back-to-school purchases, such as clothing, school supplies, computers, and other items as defined by the statute, are exempt from sales tax for this time period only. AdvertisementThe 2026 Back-to-School Sales Tax Holiday begins at 12:01 a.m. on Friday, August 7, and runs through Sunday, August 9. The sales tax exemption is limited to:Clothing – any article having a taxable value of $100 or lessSchool supplies – not to exceed $50 per purchaseComputer software – taxable value of $350 or lessPersonal computers – not to exceed $1,500Computer peripheral devices – not to exceed $1,500Graphing calculators – not to exceed $150