Illinois Tax Overview
Illinois imposes a flat income tax rate of 4.95% on all taxable income, as mandated by its state constitution which prohibits graduated rates. The state has some of the highest property taxes in the nation, particularly in the Chicago metro area. Illinois does not offer a standard deduction but provides personal exemptions instead.
Illinois Tax Quick Facts (2026)
| Income Tax | flat (top rate: 5.0%) |
| Sales Tax (State) | 6.25% |
| Property Tax (Avg Effective) | 1.97% |
| Median Household Income | $74,235 |
| Capital | Springfield |
| Population | 12.5 million |
Frequently Asked Questions About Illinois Taxes
Does Illinois have a state income tax?+
Yes, Illinois has a flat income tax system with a top marginal rate of 5.0%.
What is the property tax rate in Illinois?+
The average effective property tax rate in Illinois is approximately 1.97% of assessed home value. On a $300,000 home, that is about $5,910 per year.
What is the sales tax rate in Illinois?+
The state sales tax rate in Illinois is 6.25%. Local jurisdictions may add additional sales tax.
What is the median household income in Illinois?+
The median household income in Illinois is approximately $74,235 per year.
How does Illinois's tax burden compare to other states?+
Illinois's total tax burden depends on income tax, property tax, and sales tax combined. Use the calculator above to compare your specific situation.
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James Whitfield, CPA, MST
James Whitfield is a Certified Public Accountant with a Master of Science in Taxation. He specializes in US federal and state tax calculations and ensures all tax-related tools meet current IRS guidelines. Last updated: April 2026. Uses 2026 tax year data from state revenue departments and IRS publications.