Individual income taxes are a major source of state government revenue, accounting for 36 percent of state tax collections.
Forty-three states levy individual income taxes. Forty-one tax wage and salary income, while two states—New Hampshire and Tennessee—exclusively tax dividend and interest income. Seven states levy no income tax at all.
Of those states taxing wages, eight have single-rate tax structures, with one rate applying to all taxable income. Conversely, 33 states levy graduated-rate income taxes, with the number of brackets varying widely by state. California and Missouri each have ten brackets, the most in the country.