Illinois Income Tax Brackets 2026
Illinois uses a flat income tax system with 1 bracket.
State Tax
5.0%
Top marginal rate
COL Index
94
Below national avg
Median Income
$78,433
Household
Brackets
1
Flat tax
Illinois Tax Brackets
| Income Range | Marginal Rate |
|---|---|
| $0 — and above | 4.95% |
Illinois State Tax at Different Income Levels
| Gross Income | State Tax | Effective Rate |
|---|---|---|
| $50,000 | $2,475 | 4.95% |
| $75,000 | $3,713 | 4.95% |
| $100,000 | $4,950 | 4.95% |
| $150,000 | $7,425 | 4.95% |
| $200,000 | $9,900 | 4.95% |
| $300,000 | $14,850 | 4.95% |
Calculate Your Exact Illinois Taxes
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Frequently Asked Questions about Illinois Taxes
Does Illinois have state income tax?
Illinois has a progressive income tax system with rates ranging from 5.0% to 5.0% for 2026.
How much is federal tax in Illinois?
Federal income tax in Illinois is the same as in all other US states. For 2026, the federal brackets range from 10% to 37%, depending on your taxable income and filing status.
What is the cost of living in Illinois?
The cost of living in Illinois has an index of 94, where 100 is the national average. This means Illinois is 6% cheaper than the average US state.