Illinois Financial Calculators and Tax Info 2026

Illinois Financial Snapshot

Illinois Financial Overview 2026

Illinois is a study in tax paradoxes. The state charges a simple, flat 4.95% income tax — predictable, moderate, and easy to calculate. But layered on top is the second-highest property tax rate in the nation (2.23%) and Chicago's staggering 10.25% combined sales tax rate, creating a total burden that consistently ranks Illinois among the top 10 most taxed states despite the benign income tax rate.

For a $295,000 Illinois median home, property taxes run $6,577/year — nearly $549/month — one of the highest absolute dollar property tax bills relative to home value in the country. In Cook County (Chicago), effective rates on residential properties typically run 2.0%–2.5%, with significant variation by municipality. Suburban Cook County communities outside Chicago city limits often run 2.2%–2.8%, while DuPage County (Naperville, Aurora) runs 2.0%–2.2%. Southern Illinois and rural areas carry significantly lower rates.

Chicago's sales tax structure is layered: 6.25% state, 1.75% Cook County, 1.25% City of Chicago, and 1.0% Regional Transportation Authority (RTA) for transit. The RTA tax applies throughout the 6-county Chicagoland region, making even suburban purchases in DuPage or Lake County subject to the transit levy. Groceries are taxed at a 1% reduced state rate (not exempt like in most states), meaning Illinois residents do pay some tax on their food shopping.

Illinois's paycheck math is straightforward: 4.95% flat on income above the personal exemption ($2,425). On a $78,000 salary, Illinois income tax runs approximately $3,745/year — about $312/month. Neither low nor particularly high relative to neighboring states (Indiana 3.05%, Wisconsin up to 7.65%, Michigan 4.25%).

The fiscal picture: Illinois carries one of the highest unfunded pension liabilities of any state government, estimated in the hundreds of billions of dollars. This has contributed to decades of fiscal instability, higher borrowing costs, and ongoing pressure to raise taxes. Financial planning for Illinois residents should account for potential future tax changes, both at the state and local level.

Calculators for Illinois

Three specialized calculators with real Illinois tax rates, home prices, and deduction rules.

Illinois Financial FAQ

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