Illinois Payroll Tax Tool
Illinois Paycheck Calculator
Estimate your Illinois paycheck after federal withholding, Illinois state income tax, Social Security, Medicare, additional Medicare tax, pre-tax deductions, post-tax deductions, and any extra withholding. This calculator annualizes your pay to estimate withholding and then converts it back to the selected pay period.
Enter paycheck details
Enter your gross pay for one pay period, select your pay frequency and filing status, and add any deductions or Illinois withholding allowances. This estimator is designed for regular wages, not bonuses, supplemental wage flat-rate withholding, local taxes in other states, or employer-specific payroll edge cases.
Method used:
Taxable wages for payroll estimate = gross pay − pre-tax deductions
Federal withholding estimate = annualized taxable wages − standard deduction, run through 2026 tax brackets, less annual dependent credits, then divided back to the pay period
Illinois withholding estimate = 4.95% × max(0, current-period taxable wages − Illinois allowance value for the pay period)
Social Security = 6.2% up to the annual wage base
Medicare = 1.45% on Medicare wages, plus 0.9% employer withholding above the $200,000 threshold
Taxable wages for payroll estimate = gross pay − pre-tax deductions
Federal withholding estimate = annualized taxable wages − standard deduction, run through 2026 tax brackets, less annual dependent credits, then divided back to the pay period
Illinois withholding estimate = 4.95% × max(0, current-period taxable wages − Illinois allowance value for the pay period)
Social Security = 6.2% up to the annual wage base
Medicare = 1.45% on Medicare wages, plus 0.9% employer withholding above the $200,000 threshold
Net Pay
$0.00
Total Taxes
$0.00
Taxable Pay
$0.00
Federal
$0.00
Illinois
$0.00
Social Security
$0.00
Medicare
$0.00
Gross pay
$0.00
Pre-tax deductions
$0.00
Federal income tax
$0.00
Illinois income tax
$0.00
Social Security tax
$0.00
Medicare tax
$0.00
Additional Medicare tax
$0.00
Post-tax deductions
$0.00
Extra federal withholding
$0.00
This is an estimate for regular Illinois wages and common withholding assumptions. Employer payroll systems may differ because of W-4 details, supplemental wage rules, local payroll situations, rounding, benefit treatment, or employer-specific configuration.
Note: This tool is for informational and educational purposes only. Results are estimates and do not constitute professional advice. By using this calculator, you agree that Waldev is not liable for any errors or damages. Always verify results with official sources.
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