Illinois Income Tax Calculator
Calculate your Illinois state income tax alongside federal tax. See the full bracket breakdown, effective rate, and combined tax liability.
Last updated: · Tax Foundation (2025 state brackets) + IRS Rev. Proc. 2025-32 (2026 federal)
On a $75,000 salary in Illinois (single filer, 2025), your estimated state income tax is $3,582.56 (4.8% effective rate). Combined with federal tax of $7,670.00, your total income tax is $11,252.56 (15.0% combined effective rate). Illinois uses a flat tax rate of 4.95%. Source: Tax Foundation, state revenue department.
Illinois Deduction: $2,625.00
Personal exemption: $2,625.00
Flat rate of 4.95%. Calculated on federal AGI with state modifications. No standard deduction, but has a personal exemption.
Federal estimates use 2026 IRS brackets. State estimates use 2025 state rate data.
Results
Illinois Tax Bracket Breakdown
| Rate | Range | Tax |
|---|---|---|
| 4.95% | $0 – ∞ | $3,582.56 |
| Total Illinois Tax | $3,582.56 | |
Compare Illinois with Other States
How This Is Calculated
Illinois levies a flat income tax rate of 4.95% on all taxable income.
After applying the state deduction of $2,625.00, the tax is: (Income − Deduction) × 4.95%
Data source
State bracket data from the Tax Foundation (2025 State Individual Income Tax Rates and Brackets). Cross-referenced with the Illinois revenue department. Federal brackets from IRS Rev. Proc. 2025-32 (2026).
Frequently Asked Questions
- How much is Illinois income tax on $75,000?
- On a $75,000 salary in Illinois, you would owe approximately $3,582.56 in state income tax (4.8% effective rate) plus $7,670.00 in federal income tax, for a combined total of $11,252.56 (15.0% combined effective rate).
- What is the Illinois income tax rate for 2025?
- Illinois has a flat income tax rate of 4.95%. All taxable income is taxed at the same rate. Flat rate of 4.95%. Calculated on federal AGI with state modifications. No standard deduction, but has a personal exemption.