"Each state has its own rules and restrictions, and many start the back-to-school tax holidays around the first weekend of August," Worley added. Alabama kicks off early, running from July 18-20. Shoppers can get tax-free clothes up to $100 per item, plus computers and tablets under $750. These are "sizable savings," Worley noted.

Despite the potential savings during sales tax holidays, you'll want to make sure you stick to a budget to avoid overspending and do your research on back-to-school deals. During sales, some stores may offer lower prices on clothing, supplies and computers than you might receive by paying full price during a tax holiday.