Local buying guide reminder to start the latest shopping season . Starting Friday, Aug. 7, and extending through Sunday, Aug. 9, certain items will be free from local or state sales tax throughout Missouri. While the tax holiday is billed as a “back-to-school” event, there’s no obligation for the tax-free products you purchase to be destined for the classroom. However, the holiday is limited to certain items — such as school supplies, clothing and computers — within certain price limits. The items also must be meant for personal rather than business use.