Illinois Tax Calculator
Illinois has a flat 4.95% income tax — but the second-highest property tax rate in the US at ~2.18%.
Illinois's flat 4.95% income tax is paired with the second-highest effective property tax rate in the country at ~2.18%. The combined sales tax is about 8.91% in Cook County. Illinois does not allow a standard deduction — taxpayers must itemize. The state's overall tax burden is among the highest in the country despite the moderate income-tax rate.
Income Tax Calculator
Enter Your Income Details
See how much federal and state income tax you'll owe using 2025 brackets
How US Income Tax Works
Progressive Brackets
The US uses a progressive tax system where higher income is taxed at higher rates.
Standard Deduction
Your income up to the standard deduction amount is not taxed (${DEDUCTIONS_BY_YEAR[input.year]?.single ?? 15000} single, ${DEDUCTIONS_BY_YEAR[input.year]?.married ?? 30000} married in 2025).
Marginal vs Effective Rate
Your marginal rate is the highest bracket you reach; your effective rate is total tax divided by income.
Important Notes:
- 2025 tax brackets: This calculator uses 2025 federal tax brackets and standard deduction amounts.
- State taxes vary: Some states have no income tax (TX, FL, WA), while others range from 1% to 13.3%.
- This is an estimate: Actual tax liability depends on credits, additional deductions, and other income sources.
- Not tax advice: Consult a tax professional for personalized guidance.
How our income tax calculator works
Enter your income
Type your annual gross income from wages, self-employment, investments, or retirement. Include all sources for the most accurate estimate.
Select filing status
Choose single, married filing jointly, or head of household. We use 2025 IRS brackets and the standard deduction for your status.
Add deductions and credits
Enter pre-tax deductions (401k, HSA) and tax credits (child tax credit, education credit). The calculator adjusts your taxable income and final tax.
Key things to know about our income tax calculator:
- Federal brackets: 10% on first ~11,925 dollars, 12% on 11,926-48,475, 22% on 48,476-103,350, 24% on 103,351-197,300, up to 37% for high earners.
- State tax varies: Some states (FL, TX, WA, NV, AK, SD, TN, WY, NH) have no income tax. Others range from 0-13%. We use your states current brackets.
- Use the calculator: For take-home pay math, use the paycheck calculator. For business or self-employment tax, pair with the self-employment tax estimator.
For related calculations, try our paycheck calculator.
Illinois State Taxes at a Glance (2025)
| Item | Value | Notes |
|---|---|---|
| Income tax structure | Flat 4.95% | 2025 tax-year |
| Standard deduction (single) | $0 | $0 = must itemize |
| Standard deduction (married) | $0 | Filing jointly |
| Combined sales tax | 8.91% | State + average local |
| Effective property tax | 2.18% | Residential |
| Key state note | Flat 4.95% — property tax 2.18% (2nd highest) | |
Numbers reflect 2025 state-level rules and may not include local income taxes (NYC, Philadelphia, etc.). Use the calculator above to model your specific scenario.
Illinois Tax Sources & References
- Illinois Department of Revenue: 2025 individual income tax brackets, standard deduction, and filing requirements.
- Tax Foundation: state-level sales tax (combined state-local average 8.91%) and property-tax benchmarks.
- Federation of Tax Administrators (FTA): interstate tax-rate comparison tables.
- U.S. Census ACS: state-level household income, age, and retirement-income distribution for tax-incidence analysis.
- Taxpayer Advocate Service (IRS): federal-state conformity rules and adjustment schedules referenced for Illinois filers.
Editorial standards
Every CalcCentral calculator is authored by a credentialed subject-matter expert and independently reviewed before publication. Our editorial policy follows the same E-E-A-T guidelines used by Google to evaluate YMYL (your-money-or-your-life) pages.
Author
Maya Chen, CFA
Chartered Financial Analyst
Independently reviewed
Dr. Aaron Pak, PhD
Doctor of Kinesiology & Public Health
Last reviewed: August 12, 2026 · Next scheduled review: quarterly
Verified accuracy
Cross-checked against authoritative formulas (IRS, NIST, ACM) and updated for 2025/2026 tax years and rates.
Instant results
No server roundtrip. All math runs in your browser so results appear the moment you finish typing.
Your data stays private
We never collect, store, or transmit your inputs. Every calculation runs locally in your browser.
Learn as you calculate
Each calculator includes the formula, plain-English explanation, and FAQs so you understand the result.
Estimates only. Calculator results are for educational and planning purposes — not professional advice. For binding decisions on taxes, investments, health, or legal matters, consult a qualified professional.
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