
Individual income taxes are a major source of state government revenue, accounting for 40 percent of state tax collections. Historical State Individual Income Tax Rates and Brackets, 2015-2023.Notable 2023 State Individual Income Tax Changes.Table: 2023 State Individual Income Tax Rates and Brackets.Map: Top Marginal State Income Tax Rates.Some states tie their standard deductions and personal exemptions to the federal tax code, while others set their own or offer none at all. Some states double their single-filer bracket widths for married filers to avoid a “ marriage penalty.” Some states index tax brackets, exemptions, and deductions for inflation many others do not. States’ approaches to income taxes vary in other details as well.Hawaii has 12 brackets, the most in the country. Conversely, 30 states and the District of Columbia levy graduated-rate income taxes, with the number of brackets varying widely by state. Of those states taxing wages, 11 have single-rate tax structures, with one rate applying to all taxable income.Seven states levy no individual income tax at all. New Hampshire exclusively taxes dividend and interest income while Washington only taxes capital gains income.

Forty-three states and the District of Columbia levy individual income taxes.Individual income taxes are a major source of state government revenue, accounting for 40 percent of state tax collections in fiscal year 2020, the latest year for which data are available.
