Illinois Income Tax Calculator
Calculate your Illinois state income tax with the flat 4.95% rate and personal exemptions
Illinois Calculator
Know your exact tax burden
Updated for 2025 with real Illinois rates, brackets, and regulations
Illinois uses a flat income tax system — every resident pays exactly 4.95% on taxable income, regardless of how much they earn. Unlike progressive states such as California (up to 13.3%) or New York (up to 10.9%), a millionaire and a middle-class worker in Illinois face the identical state tax rate. Each filer claims a $2,625 personal exemption ($5,250 married filing jointly), and dependents add another $2,625 each. One of Illinois's most significant tax advantages: the state does NOT tax retirement income — 401(k) withdrawals, pensions, and Social Security are all completely exempt, making it one of only three states with full retirement income exemption. Corporations pay a separate flat rate of 7% on net income.
Calculate Your IL Tax
Illinois Income Tax
$3,583
Effective IL Rate
4.78%
Total Effective Rate
23.5%
IL Taxable Income
$72,375
Personal Exemption
$2,625
Federal Tax (est.)
$8,341
FICA
$5,738
Take-Home Pay
$57,339
Breakdown
Insight
Illinois uses a flat 4.95% income tax rate on all income — no graduated brackets. On $75,000 gross income (single), you owe $3,583 in state tax after the $2,625 personal exemption. Illinois has no standard deduction, but all retirement income (401k, pension, Social Security) is fully exempt. Your effective IL rate is 4.78%. Compared to Texas (0%), you pay $3,583 more; vs California (9.3%+), you save $2,894/year.
AI Explanation
What This Means
Based on default inputs, the Illinois Income Tax Calculator shows a illinois income tax of $3,583. Key figures: Effective IL Rate: 4.78%, Total Effective Rate: 23.5%, IL Taxable Income: $72,375, Personal Exemption: $2,625, Federal Tax (est.): $8,341, FICA: $5,738, Take-Home Pay: $57,339.
Key Insights
Illinois uses a flat 4.95% income tax rate on all income — no graduated brackets. On $75,000 gross income (single), you owe $3,583 in state tax after the $2,625 personal exemption. Illinois has no standard deduction, but all retirement income (401k, pension, Social Security) is fully exempt. Your effective IL rate is 4.78%. Compared to Texas (0%), you pay $3,583 more; vs California (9.3%+), you save $2,894/year.
What You Can Do
Enter your actual figures in the calculator above for a personalized breakdown. Consider consulting a tax professional for comprehensive planning, especially for complex situations involving multiple income sources or deductions.
Keep In Mind
This calculator provides estimates based on 2026 rates. Actual tax liability may vary based on credits, exemptions, and other factors not captured here. This is for educational purposes only and should not be considered tax advice.
How the Illinois Income Tax Calculator Works
The Illinois Income Tax Calculator uses 2026 tax rates, brackets, and deductions specific to Illinois to provide you with an accurate estimate of your tax obligations. Unlike generic federal-only calculators, this tool accounts for the unique tax structure that Illinois residents face.
Formula
IL Tax = (Annual Income - Personal Exemption) × 4.95%. Personal Exemption: $2,625 (single), $5,250 (married). Retirement income: $0 tax.Simply enter your financial details above, and the calculator instantly computes your results using the latest available data. All calculations happen directly in your browser — your personal information is never sent to any server or stored anywhere.
Why Use a Illinois-Specific Calculator?
State-Specific Rates
Uses real 2026 Illinois tax brackets, rates, and thresholds — not generic national averages that miss state-level nuances.
Local Programs & Exemptions
Factors in Illinois-specific programs, exemptions, and deductions that national calculators simply don't account for.
Instant & Private
All calculations run locally in your browser. No account required, no data stored, no waiting for results.
AI-Powered Explanations
Get a plain-English breakdown of your results with actionable insights you can actually use for financial planning.
What's Included
Flat 4.95% Rate
Simple flat-rate calculation — no bracket confusion, same rate for all income levels
Retirement Income Exempt
Illinois exempts ALL retirement income — 401(k), pension, and Social Security are $0 state tax
Personal Exemptions
Calculates $2,625 per person exemption — reduces taxable income for each family member
Frequently Asked Questions
What is Illinois's income tax rate?
Illinois has a flat income tax rate of 4.95% for individuals, applied uniformly to all taxable income. This means whether you earn $30,000 or $3 million, the state tax rate is identical. The corporate flat rate is 7%.
What is the Illinois personal exemption?
Illinois allows a $2,625 personal exemption per filer — $2,625 for single filers, $5,250 for married filing jointly, plus an additional $2,625 per dependent. These exemptions reduce your taxable income before the 4.95% rate is applied.
Does Illinois tax retirement income?
No. Illinois is one of only three states that fully exempts ALL retirement income from state income tax. This includes 401(k) and IRA withdrawals, pensions (including public employee pensions), military retirement pay, and Social Security benefits — all completely tax-free at the state level.
How does Illinois compare to neighboring states for income tax?
Illinois's 4.95% flat rate sits between its neighbors: Indiana (3.05%), Michigan (4.25%), Wisconsin (up to 7.65% progressive), and Missouri (up to 4.95% progressive). Unlike Illinois, Indiana and Michigan do not offer the same retirement income exemption.
What is the Illinois standard deduction for 2025?
Illinois does not have a standard deduction in the federal sense. Instead, Illinois provides a personal exemption of $2,625 per person. Illinois does not allow itemized deductions — the only deductions available are limited specific items like educator expenses and certain retirement contributions.
Important Information for Illinois Residents
Tax laws in Illinois can change annually. This calculator is updated regularly to reflect the latest 2026 rates and regulations, but you should always verify important financial decisions with a qualified Illinois tax professional or CPA.
This tool is designed for informational and educational purposes. While we strive for accuracy using official Illinois Department of Taxation data, the results should be used as estimates for planning purposes only. Your actual tax liability may differ based on credits, special circumstances, and legislative changes that occur after our last update.
For filing deadlines, payment schedules, and official forms, visit the Illinois Department of Taxation and Finance website. If you have complex tax situations involving multiple states, business income, or significant investment gains, professional guidance is recommended.
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