State tax rules vary more than anything else in your paycheck. These pages walk through each state's real rate structure, with the calculator pre-set for that state.
California
10 progressive brackets, 1%–13.3%, plus the Mental Health Services Tax over $1M.
New York
9 progressive brackets, 3.9%–10.9%, with a note on NYC's added city tax.
Texas
No state income tax — your paycheck only loses federal tax and FICA.
Florida
No state income tax, same federal + FICA math as every other state.
Washington
No state income tax, though watch for Paid Family & Medical Leave premiums.