{"country":"us","countryName":"United States","year":"2026","yearLabel":"2026","isCurrent":true,"region":{"code":"il","slug":"illinois","name":"Illinois"},"currency":"USD","effectiveFrom":"2026-01-01","effectiveTo":"2026-12-31","status":"verified","underReview":[],"dataVerified":true,"sections":[{"id":"state-income-tax-all","title":"Illinois income tax brackets: All filing statuses","group":"income-tax","kind":"bands","rows":[{"from":0,"to":null,"rate":0.0495}],"source":{"title":"Illinois Department of Revenue Informational Bulletin FY 2026-15, What's New for Illinois Income Taxes (December 2025)","url":"https://tax.illinois.gov/research/publications/bulletins/fy-2026-15.html","retrievedAt":"2026-10-16"},"verified":true,"basis":"State taxable income, per year"},{"id":"state-income-tax","title":"Illinois income tax: key figures","group":"income-tax","kind":"values","rows":[{"label":"Type","value":"Flat rate","unit":"text"},{"label":"Flat rate","value":0.0495,"unit":"rate"},{"label":"Top 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