State income tax is a tax levied by a state on the income of its residents, as well as on any nonresidents who earn state-sourced income.

State income tax rates vary widely across the U.S. and can impact everything from your take-home pay to your long-term ...

Forbes contributors publish independent expert analyses and insights. I cover the intersection of state & federal policy and politics. The number of states with a flat rate income tax has grown by ...

Some states give multiple tax breaks to retirees, while nine others have no state tax on any kind of income, no matter your age.

Eliminating state income taxes sounds great to many voters, but Republicans backing the push in multiple states still face questions about whether such big tax cuts can be made without raising other ...

A growing number of states are raising taxes on wealthy residents through millionaire taxes. Here are the states leading the ...