No matter how you calculate it, back-to-school shopping is expensive. Families with children in grades K-12 are expected to spend an average of $235.39 on clothing, $204.06 on electronics, $126.35 on shoes and $107.76 on school supplies for back-to-school in 2016, according to the National Retail Federation. The high cost of school-related items makes finding ways to save even more important. This year, states across the country are again easing the burden of stocking up on such purchases by eliminating sales tax for a few days. We have everything you need to know to take advantage of these sales tax holidays. What are sales tax holidays? Sales tax holidays, also known as tax-free weekends, are periods of time during which some states remove sales tax on certain types of items, such as apparel and computers.