Illinois Tax Brackets
Illinois uses a flat income tax rate of 4.95%. All taxable income is taxed at the same rate regardless of income level.
Total income tax
$18,120
18.1% effective rate
Federal
$13,170
22.0% marginal
State
$4,950
4.95% flat
Taxable income: $83,900 (after $16,100 standard deduction)
Federal bracket breakdown
| Bracket | Rate | Taxable | Tax | Cumulative |
|---|---|---|---|---|
| $0–$12,400 | 10.0% | $12,400 | $1,240 | $1,240 |
| $12,400–$50,400 | 12.0% | $38,000 | $4,560 | $5,800 |
| $50,400–$105,700 | 22.0% | $33,500 | $7,370 | $13,170 |
Based on 2026 federal brackets and Illinois state tax rates. Does not include FICA, local taxes, credits, or itemized deductions.
Illinois income tax rate (2026)
Illinois uses a flat income tax rate of 4.95% on all taxable income. Unlike progressive systems, every dollar is taxed at the same rate.
Illinois tax at different income levels
| Income | Federal tax | State tax | Total tax | Effective rate |
|---|---|---|---|---|
| $50,000 | $3,820 | $2,475 | $6,295 | 12.6% |
| $75,000 | $7,670 | $3,713 | $11,383 | 15.2% |
| $100,000 | $13,170 | $4,950 | $18,120 | 18.1% |
| $150,000 | $24,734 | $7,425 | $32,159 | 21.4% |
Single filer, standard deduction, no other deductions. Income tax only (excludes FICA).
FAQ
What is the income tax rate in Illinois?
Illinois has a flat income tax rate of 4.95%. All income is taxed at the same rate.
How much income tax do I pay in Illinois on $100,000?
On $100,000 as a single filer in Illinois: federal tax of $13,170 (13.2% effective) plus state tax of $4,950 (5.0% effective). Total income tax: $18,120 (18.1% effective rate).
What tax bracket am I in for Illinois?
Illinois uses a flat tax — there is only one bracket at 4.95%. Your federal bracket depends on your taxable income.
Does this include FICA or local taxes?
No. This shows only federal and Illinois state income tax. FICA (Social Security + Medicare) adds ~7.65%. Some cities have additional local taxes. Use our Paycheck Estimator for a complete breakdown.
Other states
- Alabama tax brackets
- Alaska tax brackets
- Arizona tax brackets
- Arkansas tax brackets
- California tax brackets
Related tools
- Illinois Paycheck Estimator — full take-home pay with FICA
- Illinois Bonus Tax Calculator — how bonuses are taxed
- Take-Home Pay by State — compare all 50 states
- Pay Raise Calculator — see how a raise affects your brackets
This calculator uses 2026 tax rates and standard deductions. It does not include FICA, local taxes, credits, AMT, or itemized deductions. Consult a tax professional for advice.