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Enter your income information to see your estimated Illinois take-home pay and tax breakdown.
How Illinois Taxes Work
Understanding your paycheck deductions in Illinois
Illinois State Tax
Illinois uses a flat tax rate of 4.95% on all taxable income, making tax calculations straightforward.
Federal Taxes
Federal income tax uses progressive brackets ranging from 10% to 37% based on your income level and filing status.
FICA Taxes
Social Security (6.2%) and Medicare (1.45%) are automatically deducted from every paycheck for all employees.
Illinois Tax Facts
- State abbreviation: IL
- Tax type: Flat Tax
- Tax rate: 4.95%
- Local taxes: None
Federal Tax Resources
- 2025 federal brackets: 10% to 37%
- Standard deduction (Single): $15,750
- Standard deduction (Married): $31,500
- Social Security wage base: $176,100
Frequently Asked Questions
Common questions about Illinois paycheck calculations and taxes
Other Flat Tax States
Explore paycheck calculators for states with similar tax structures
Arizona has a flat income tax rate of 2.5% on all taxable income.
Colorado has a flat income tax rate of 4.40% on all taxable income.
Georgia transitioned to a flat tax rate of 5.39% for the 2025 tax year.
Idaho has a flat-rate income tax system with a 5.30% rate on taxable income above small thresholds.