A new study by the Tax Foundation [1] says Tennessee has the seventh lowest tax burden (as a percentage of income) of any state in the US, at 8.3%. The six states with a lower tax burden?

Alaska, 6.4 percent
Nevada, 6.6 percent
Wyoming, 7.0 percent
Florida, 7.4 percent
New Hampshire, 7.6 percent
South Dakota, 7.9 percent

link [2] and some commentary here [3].