Your hub for Illinois taxes: state income tax (Flat 4.95%), plus free calculators for take-home pay, self-employment tax, quarterly estimates, and salary conversion.
Last updated: May 2026 · Data: IRS, BLS, Illinois Department of Revenue
Illinois levies a state income tax (Flat 4.95%) that is withheld from wages on top of federal tax and FICA. Illinois has a constitutionally mandated flat income tax rate, currently set at 4.95%. A 2020 ballot measure to allow graduated rates was rejected by voters. The state also does not tax retirement income.
| Tax | 2026 Rate / Detail |
|---|---|
| Illinois State Income Tax | Flat 4.95% |
| Illinois State Sales Tax (base) | 6.25% |
| Federal Income Tax | 10% to 37% (progressive brackets) |
| Social Security | 6.2% on first $176,100 |
| Medicare | 1.45% on all wages (plus 0.9% above $200,000) |
| Federal Standard Deduction (Single / MFJ) | $15,000 / $30,000 |
| Minimum Wage | $15.00 / hour |
| State Tax Authority | Illinois Department of Revenue |
Illinois has a state income tax. The 2026 rate is Flat 4.95%. This applies on top of federal income tax and FICA (Social Security and Medicare) withheld from your pay.
For 2026, Illinois income tax is Flat 4.95%. Illinois has a constitutionally mandated flat income tax rate, currently set at 4.95%. A 2020 ballot measure to allow graduated rates was rejected by voters. The state also does not tax retirement income.
A Illinois paycheck has federal income tax, Illinois state income tax (Flat 4.95%), Social Security (6.2% up to $176,100), and Medicare (1.45%) withheld. Try the take-home pay calculator for a personalized net-pay estimate.
Yes. Self-employed workers in Illinois generally make quarterly estimated payments to the IRS and to the state if they expect to owe tax. The quarterly estimated tax calculator estimates each payment and the due dates.
The Illinois statewide base sales tax rate is 6.25%. Local jurisdictions may add their own rates on top of the state rate.