This new database and analysis provides a long-term view of changes in state personal income, corporate income and sales tax rates. The data reveal that since 1990, lawmakers have cut top personal income tax rates 210 times and top corporate tax rates 168 times. You can download the historic rate data here or use our new interactive State Tax Rate Explorer. Other key findings include:The median top state personal income tax rate has fallen from 6 percent in 1990 to 4.6 percent today. At the same time, higher sales tax rates affect nearly every household, including families whose incomes are far below the threshold at which top income tax rates apply.