Illinois income tax rates for 2026
A flat 4.95% of net income. The calculation starts from federal adjusted gross income with Illinois modifications.
| Rate | Taxable income |
|---|---|
| 4.95% | All taxable income |
Deductions, exemptions and credits
Before the rates apply, Illinois allows a personal exemption of $2,925 (single) or $5,850 (joint). The calculator uses these for the filing status you choose; dependent exemptions and credits, which lower the tax further for families, are not included.
Worked example: $75,000 in Illinois
Single filer with $75,000 of income before state deductions.
Taxable income = $75,000 − $2,925 (personal exemption) = $72,075.00
Brackets: 4.95% × $72,075.00 = $3,567.71
Illinois income tax = $3,567.71 — an effective rate of 4.76% and a marginal rate of 4.95%.
Illinois income tax at common incomes
| Income | Single | Effective | Married jointly | Effective |
|---|---|---|---|---|
| $30,000 | $1,340 | 4.47% | $1,195 | 3.98% |
| $50,000 | $2,330 | 4.66% | $2,185 | 4.37% |
| $75,000 | $3,568 | 4.76% | $3,423 | 4.56% |
| $100,000 | $4,805 | 4.81% | $4,660 | 4.66% |
| $150,000 | $7,280 | 4.85% | $7,135 | 4.76% |
| $250,000 | $12,230 | 4.89% | $12,085 | 4.83% |
Income before state deductions; standard deduction and personal exemptions for the filer (and spouse) only; no dependents, itemized deductions or local taxes.
Illinois compared with nearby states
At $75,000 (single), Illinois ranks 5 of 51 for state income tax, where 1 is the highest.
| State | Tax on $75,000 | Effective rate | Top rate |
|---|---|---|---|
| Illinois | $3,568 | 4.76% | 4.95% |
| Wisconsin | $2,944 | 3.92% | 7.65% |
| Iowa | $2,198 | 2.93% | 3.8% |
| Missouri | $2,534 | 3.38% | 4.7% |
| Kentucky | $2,507 | 3.34% | 3.5% |
| Indiana | $2,183 | 2.91% | 2.95% |
More about taxes in Illinois
- The Illinois Constitution requires a flat income tax, which is why the state uses a single 4.95% rate.
Frequently asked questions
What is the Illinois income tax rate for 2026?
A flat 4.95% of net income. A single filer with $75,000 of income pays an effective 4.76% after deductions.
How much Illinois income tax do I pay on $75,000?
About $3,568 for a single filer — 4.76% of income — after $2,925 of personal exemption. A married couple with $150,000 owes about $7,135.
What deductions does Illinois allow?
Illinois allows a personal exemption of $2,925 (single) or $5,850 (joint). Dependent exemptions or credits, where the state offers them, lower the tax further.
Is Illinois's income tax higher than its neighbors'?
At $75,000 (single), Illinois ranks 5 of 51 for state income tax, where 1 is the highest. Among nearby states, Indiana is lowest at $2,183 and Illinois is highest at $3,568.
Estimates only — not tax advice. Illinois figures: Tax Foundation, State Individual Income Tax Rates and Brackets, 2026 (as of Jan. 1, 2026). Checked October 2026. Your return may include income, deductions and credits this estimate leaves out.