Find the marginal tax bracket that applies to income in Illinois.
Finds the bracket for income in Illinois using the U.S. federal single brackets and shows the marginal rate, total bracket tax, and an approximate state reference rate.
Bracket tax
Sum of (income within each tier × tier rate)
Federal single brackets shown as reference.
Because lower brackets are taxed at lower rates — only income above each threshold is taxed at the next rate.
Rates are approximate reference values. Local rates, exemptions and rules can differ, so treat the output as a planning figure only.