Illinois charges a flat 4.95 percent income tax on all taxable income regardless of how much a resident earns, and Chicago does not impose an additional city income tax. That combination means Chicago residents face a lower income tax burden than their counterparts in New York City or Philadelphia, but the advantage narrows sharply once property taxes and sales taxes enter the equation. Understanding how these layers interact is essential for anyone living, working, or freelancing in Chicago.
How Does Illinois’ Flat Income Tax Work?
Illinois is one of roughly a dozen states that uses a flat income tax structure, meaning every taxpayer pays the same 4.95 percent rate whether their taxable income is $30,000 or $3 million. The Illinois Constitution mandates this uniform rate. In 2020, voters rejected a ballot measure that would have amended the constitution to allow a graduated income tax system — the proposal failed 53.4 percent to 46.6 percent, keeping the flat structure in place.
The 4.95 percent rate applies to Illinois net income, which starts with a taxpayer’s federal adjusted gross income and is reduced by a personal exemption allowance. Illinois does not offer a standard deduction in the way the federal system does. Instead, each taxpayer and dependent receives a personal exemption that reduces taxable income — currently set at approximately $2,850 per person, with a scheduled increase to $2,925 for the 2026 tax year.
Employers withhold Illinois income tax from wages at the flat 4.95 percent rate. For W-2 employees with a single Illinois-based job, withholding is straightforward. Self-employed workers and freelancers must make quarterly estimated tax payments to the Illinois Department of Revenue using Form IL-1040-ES, since no employer is handling withholding on their behalf. Underpayment of estimated taxes can trigger penalties even if the taxpayer files on time.
Why Doesn’t Chicago Have A City Income Tax?
Unlike New York City, Philadelphia, and several Ohio cities that levy their own income taxes on top of state rates, Chicago does not impose a city-level income tax. For a Chicago resident earning $100,000, that distinction translates to roughly $3,800 to $5,300 in annual savings compared to a New York City resident at the same income level, who owes both New York State income tax and a separate city income tax.
The absence of a city income tax, however, does not mean Chicago residents enjoy a light overall tax burden. The city compensates through other revenue streams that residents encounter daily. Chicago’s combined sales tax rate sits at 10.25 percent — assembled from overlapping state, county, city, and transit authority levies — making it one of the highest combined sales tax rates among major U.S. cities. For a household spending $50,000 annually on taxable goods and services, that rate produces more than $5,100 in sales taxes alone.
How Do Property Taxes Factor Into The Overall Burden?
Property taxes represent the single largest tax expense for most Chicago homeowners and a primary reason Illinois consistently ranks among the highest-taxed states nationally. The Tax Foundation’s 2026 Illinois profile places the state’s effective property tax rate at 1.88 percent of owner-occupied housing value, though Cook County — which encompasses Chicago — typically runs higher, with effective rates averaging closer to 2.7 percent.
On a home assessed at $400,000, Cook County’s effective rate produces an annual property tax bill of approximately $10,800. That figure exceeds what homeowners pay on comparably valued properties in most major U.S. metro areas.
| Tax Type | Rate | Key Detail |
|---|---|---|
| State income tax | 4.95% flat | Applies uniformly to all income levels |
| City income tax | None | Chicago does not levy a city income tax |
| Combined sales tax (Chicago) | 10.25% | State + county + city + transit authority |
| Effective property tax (Cook County) | ~2.7% | Among the highest metro rates nationally |
Illinois’ heavy reliance on property tax revenue — property taxes account for 32.3 percent of all state and local tax revenue — reflects a structural dynamic driven by school funding formulas, municipal pension obligations, and decades of fiscal decisions at the county and township level.
What Tax Credits Are Available To Chicago Residents?
Illinois offers several credits that can reduce the effective tax burden for qualifying residents. The Illinois Earned Income Tax Credit equals 20 percent of the federal EITC and is fully refundable, meaning eligible taxpayers can receive the credit even if they owe no state income tax. For tax year 2025, the maximum state EITC reaches approximately $1,609 depending on household size and income. Residents who qualify for the Illinois EITC and have at least one child under age 12 are also eligible for an additional Illinois Child Tax Credit, calculated at 40 percent of their state EITC amount.
Illinois also exempts all retirement income from state income tax, including Social Security benefits, pension payments, 401(k) distributions, and IRA withdrawals. That blanket exemption makes Illinois one of the more favorable states for retirees from a pure income tax perspective, even as property taxes may offset the advantage for retirees who own homes.
How Should Remote Workers And Freelancers Handle Illinois Taxes?
Illinois maintains reciprocal income tax agreements with four neighboring states: Iowa, Kentucky, Michigan, and Wisconsin. Residents of those states who work in Illinois — or Illinois residents who work in those states — pay income tax only to their state of residence. Indiana and Missouri, despite their proximity to Chicago, do not have reciprocal agreements with Illinois, meaning workers crossing those borders may need to file in both states and claim credits to avoid double taxation.
Freelancers and independent contractors based in Chicago owe the flat 4.95 percent state income tax on all Illinois-sourced income, plus federal self-employment tax covering Social Security and Medicare contributions. Quarterly estimated payments are due in April, June, September, and January. The combination of federal self-employment tax (15.3 percent on net earnings) and Illinois income tax (4.95 percent) means a Chicago freelancer effectively pays more than 20 percent in combined income-related taxes before federal income tax brackets are applied.
Chicago’s tax structure rewards residents who understand where the real costs accumulate — not in a city income tax that does not exist, but in the property tax bills, sales tax receipts, and quarterly estimated payments that collectively define the financial reality of living in Illinois.
