Illinois Income Tax Calculator (2026 Filing Season)
Illinois has a flat 4.95% state income tax for the 2025 tax year.
Flat 4.95% with no standard deduction — only a small per-person exemption (~$2,850).
Enter taxable income — this state has no standard deduction.
The same $75,000 income in a no-income-tax state (Texas, Florida, Tennessee…) would owe $0 in state income tax — a difference of $3,713 per year.
We only store your state and filing status — never your income.
Illinois 2025 Tax Brackets
Single
| Taxable income over | Rate |
|---|---|
| $0 | 4.95% |
Married filing jointly
| Taxable income over | Rate |
|---|---|
| $0 | 4.95% |
File your IL return
These handle both your federal and Illinois state return.
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Our complete Illinois tax guide covers sales tax, property tax, deadlines, and key deductions.
Educational estimate only — excludes credits, itemized deductions, and local income taxes except where noted. 2025 tax-year data, verified 2026-06. Not tax advice; confirm with the Illinois revenue department or a tax professional before filing.