Combined sales tax rate
10.50%, since 1 August 2026
Chicago's rate is four layers stacked on the state base: 6.25% Illinois, 1.75% Cook County, 1.25% City of Chicago, and 1.25% regional transit, recently renamed NITA (Northern Illinois Transit Authority, formerly the RTA), which rose from 1.00% to 1.25% on 1 August 2026. Storeveu holds that blended rate as a per-store override on the state configuration, so a Chicago location rings 10.50% while the rest of your Illinois stores keep their own local blend.