Illinois tax breakdown: where your taxes go
Illinois data updated · State budget model 2025 · Federal, state, and local taxes
Where do my Illinois tax dollars go?
It depends on your ZIP code, income, and whether you own or rent. Federal income and payroll taxes fund programs like Social Security, Medicare, and defense. Illinois has a flat 4.95% state income tax. State taxes fund the Illinois budget, and property taxes fund your county, city or town, schools, and special districts. Enter a Illinois ZIP code to see your own breakdown, built from Illinois Department of Revenue 2025 individual income tax rate and exemption guidance and Illinois Department of Revenue 2024 Property Tax Statistics.
See your own Illinois breakdown
Enter your ZIP code and income. Try Chicago (60601) as an example.
Calculate where my Illinois taxes goIllinois taxes we estimate
Every Illinois estimate includes federal income tax, Social Security, and Medicare, plus:
- State Income Tax. Illinois resident income tax at the TY2025 flat rate.
- County, Municipal, Township, School, and Special-District Property Tax. Best-fit ZIP/ZCTA property tax using Illinois IDOR aggregate rate data by county, municipal, township, school, and special-district layers.
How Illinois state taxes work
- Flat Income Tax: Illinois uses a 4.95% individual income-tax rate for tax year 2025.
- Personal Exemption: The model applies the TY2025 personal exemption by filing status.
- No Local Income Tax: Illinois municipalities do not levy a broad resident local income tax in this model.
Credits, itemized adjustments, retirement-income exclusions, and household-specific exemption additions require additional inputs and are outside this rollout.
How Illinois property tax works
- Formula: Market value × assessment ratio × aggregate rate per $1,000.
- Rate Layers: Illinois IDOR county, municipal, township, school, and special-district aggregate rates are included where ZIP/ZCTA resolves to a supported context.
- Budget Scope: Local charts use Illinois Comptroller city, village, and township annual financial-report spending profiles.
- ZIP Caveat: ZIP lookup is area-weighted and cannot infer parcel-specific equalized assessed value, exemptions, tax code, or exact overlapping district bill.
Cook County class ratios, exemptions, and parcel-level tax-code assignment can materially change a household's actual bill and are not inferred from ZIP alone.
Official Illinois data sources
State budget model: 2025. Illinois data last updated May 2026.
Illinois tax questions
Where do my Illinois state taxes go?
Illinois has a flat 4.95% state income tax. Flat Income Tax: Illinois uses a 4.95% individual income-tax rate for tax year 2025. Personal Exemption: The model applies the TY2025 personal exemption by filing status. No Local Income Tax: Illinois municipalities do not levy a broad resident local income tax in this model. Enter your ZIP code and income to see your estimated dollars by budget category.
How is property tax calculated in Illinois?
Formula: Market value × assessment ratio × aggregate rate per $1,000. Rate Layers: Illinois IDOR county, municipal, township, school, and special-district aggregate rates are included where ZIP/ZCTA resolves to a supported context. Budget Scope: Local charts use Illinois Comptroller city, village, and township annual financial-report spending profiles. ZIP Caveat: ZIP lookup is area-weighted and cannot infer parcel-specific equalized assessed value, exemptions, tax code, or exact overlapping district bill.
Which taxes does Tax Transparency estimate for Illinois residents?
Federal income tax, Social Security, and Medicare, plus these Illinois taxes: State Income Tax and County, Municipal, Township, School, and Special-District Property Tax.
Where does the Illinois data come from, and how current is it?
The Illinois estimate uses Illinois Department of Revenue 2025 individual income tax rate and exemption guidance, Illinois Department of Revenue 2024 Property Tax Statistics, and Illinois Comptroller FY2025 local government financial database. The state budget model reflects 2025, and the state data was last updated May 2026.
What does the Illinois estimate not include?
Credits, itemized adjustments, retirement-income exclusions, and household-specific exemption additions require additional inputs and are outside this rollout. Cook County class ratios, exemptions, and parcel-level tax-code assignment can materially change a household's actual bill and are not inferred from ZIP alone. Illinois local budget detail comes from Illinois Comptroller annual financial reports with fiscal years preserved. ZIP/ZCTA property-tax profiles are best-fit and cannot replace parcel-level tax-code lookup.