Calculate state income tax for 20 major states using real 2026 tax brackets. See effective rate, marginal rate, monthly burden, and combined federal + state estimate.
State income tax rates vary enormously — from 0% in Texas and Florida to 13.3% in California. Nine states have no income tax at all. Some states use flat rates (Illinois: 4.95%, Pennsylvania: 3.07%); others use progressive brackets similar to the federal system. State deductions and exemptions differ significantly from federal rules.