Cook County collects no county-level business income tax. Illinois imposes a 7% corporate income tax plus the 2.5% Personal Property Replacement Tax (PPRT) distributed to local governments. Cook County levies industry-specific taxes on parking, hotels, alcohol, and tobacco under Ch. 74.
Illinois eliminated the personal property tax on businesses in 1979 and replaced it with the Personal Property Replacement Tax (35 ILCS 5/201(c)-(d)): 2.5% on C-corp income and 1.5% on partnerships and S-corps, distributed to counties, schools, and local taxing bodies. The state corporate income tax adds 7% under 35 ILCS 5/201. Cook County's own business levies (Ch. 74) cover non-income items: parking, hotel, amusement, alcoholic beverage, gasoline, tobacco, firearm/ammunition, and gambling machines. The county property tax system uses different assessment percentages by class: 10% residential, 25% commercial/industrial, with Class 6b/7/8 incentives reducing assessment for rehabilitation projects.
Failure to file or pay state PPRT or Cook County industry-specific taxes triggers Department of Revenue audit, late penalties of 10-30%, plus interest at 1% monthly under 35 ILCS 735.
Cook County, IL
Cook County imposes a real estate transfer tax of $0.25 per $500 of value (Ord. 93-O-27, Ch. 74 Art. III) on top of the Illinois state tax of $0.50 per $500 ...
Cook County, IL
Cook County's Parking Lot and Garage Operations Tax (Ord. 95-O-27, Ch. 74 Art. IX) charges $3 per day Monday-Friday and $2 per day Saturday-Sunday on commerc...
See how Cook County's business tax classification rules stack up against other locations.
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