In 2016, state sales tax rates look a lot like they did in 2015. In 2015, 45 states plus the District of Columbia levied a sales tax – the same was true on January 1, 2016. In 2015, five states (Alaska, Delaware, Montana, New Hampshire and Oregon) did not levy a sales tax – the same five states did not levy a sales tax on January 1, 2016. Sales tax rates (or lack thereof) remained the same in 49 states and the District of Columbia on January 1, 2016 over 2015 rates. Those rates range from a low of 2.9 percent in Colorado to a high of 7.5 percent in California, with an average rate 5.65 percent.