Illinois Income Tax Calculator (2026 Federal + State)
Flat 5.0% state rate — combined tax on $75k is about $11,383
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7/16/2026
Input Parameters
Your Details
Your pay before any taxes or deductions, for the frequency you picked.
Deductions
401(k), HSA, and pre-tax health premiums. Lowers income tax (401k is still subject to FICA).
Optional. Leave at 0 to use your state's 2026 rate. Graduated states use an estimated effective rate — adjust here for precision.
Pre-set to Illinois. Adjust your salary, filing status, and deductions — federal, state, and FICA tax update instantly.
How Income Tax Works in Illinois (2026)
Illinois levies a flat 5.0% state income tax in 2026 — the same rate for every dollar of taxable income. On top of federal tax, a single filer earning $75,000 pays about $3,713 in Illinois state income tax, bringing the combined federal + state income tax bill to roughly $11,383. That's an effective income tax rate of about 15.2%.
A flat tax has a clear advantage for budgeting: a raise never pushes any of your income into a higher state bracket. Every extra dollar earned in Illinois is taxed at the same 5.0% at the state level. The 5.0% rate is above the 4.8% average among states that tax income.
Illinois income tax by salary level (2026, single filer)
| Gross salary | Federal tax | State tax | Total income tax | Effective rate | After-tax income |
|---|---|---|---|---|---|
| $40,000 | $2,620 | $1,980 | $4,600 | 11.5% | $32,340 |
| $60,000 | $5,020 | $2,970 | $7,990 | 13.3% | $47,420 |
| $75,000 | $7,670 | $3,713 | $11,383 | 15.2% | $57,880 |
| $100,000 | $13,170 | $4,950 | $18,120 | 18.1% | $74,230 |
| $150,000 | $24,734 | $7,425 | $32,159 | 21.4% | $106,366 |
| $200,000 | $36,734 | $9,900 | $46,634 | 23.3% | $139,027 |
Single filer, standard deduction, no pre-tax deductions. After-tax income includes FICA deductions. 2026 federal brackets per IRS Rev. Proc. 2025-32.
Beyond your income tax
See your paycheck breakdown by pay period with the Illinois Paycheck Calculator. For capital gains on investments, use the Capital Gains Tax Calculator. Freelancers and contractors can estimate self-employment tax with the Self-Employment Tax Calculator. Planning a home purchase? The Home Affordability Calculator factors in your after-tax income.
Compare Illinois income tax with nearby states
- Indiana income tax calculator — flat 3.0%
- Wisconsin income tax calculator — graduated (~5.3%)
- Missouri income tax calculator — graduated (~4.7%)
- Iowa income tax calculator — flat 3.8%
See all 50 states on the Income Tax Calculator hub.
Frequently asked questions
What is the income tax rate in Illinois for 2026?
Illinois has a flat 5.0% state income tax rate in 2026, applied to all taxable income regardless of amount.
How much income tax do I pay on $75,000 in Illinois?
A single filer earning $75,000 in Illinois pays approximately $11,383 in combined federal and state income tax for 2026 — an effective income tax rate of about 15.2%. Adding FICA (Social Security + Medicare) brings total tax to about $17,120.
How does Illinois's income tax compare to other states?
Illinois's flat rate of about 5.0% is above the 4.8% average among states that tax income. Use the comparison links below to see specific neighboring states.
Why can't Illinois raise taxes on high earners only?
The Illinois Constitution mandates a flat income tax — one rate for everyone. Changing that requires a constitutional amendment, and voters rejected the last attempt (the 2020 'Fair Tax' measure).
Methodology & sources
Federal tax uses 2026 IRS brackets and standard deductions (Revenue Procedure 2025-32). State tax rates reflect 2026 law from the Tax Foundation and state revenue departments; graduated-state figures are estimated effective rates. FICA uses the 2026 Social Security wage base of $184,500 (6.2%) plus Medicare (1.45%). Local city or county taxes (e.g. NYC, Portland) are not included. Estimates for planning only, not tax advice. See our editorial policy for how we verify formulas.