Illinois paycheck calculator 2026
This Illinois paycheck calculator estimates take-home pay per paycheck based on payroll withholding rules. Illinois applies state income tax withholding at a flat rate, in addition to federal income tax withholding and FICA payroll taxes.
Estimates are shown for the 2026 tax year. In cases where official figures have not yet been finalized, calculations are based on the most recently available data and may be updated when final guidance is published.
Enter your income details to see an estimate.
Illinois paycheck calculator 2026 – how it works
Paycheck calculations start with gross pay for the pay period. Required payroll withholding is then applied to estimate net pay. In Illinois, this includes federal income tax withholding under IRS rules, Illinois state income tax withholding at a flat rate, and FICA payroll taxes for Social Security and Medicare.
Examples
When gross pay changes between pay periods, withholding amounts can also change. Federal income tax withholding, Illinois state income tax withholding, and FICA are applied based on wages for each paycheck, which can result in different net pay amounts.
Limitations and important notes
This calculator provides an estimate of payroll withholding, not a final tax calculation. Actual paychecks may vary due to employer payroll systems, rounding practices, and timing of earnings.
FAQs about Illinois paycheck calculator 2026
Does Illinois have state income tax withholding?
Yes. Illinois withholds state income tax from wages using a flat-rate system.
What taxes are withheld from an Illinois paycheck?
Illinois paychecks are reduced by federal income tax withholding, Illinois state income tax withholding, and FICA payroll taxes for Social Security and Medicare.
Why can take-home pay change between pay periods?
Take-home pay can change when gross earnings change. Payroll withholding amounts are calculated separately for each paycheck.
Is this calculator a final tax calculation?
No. This tool estimates payroll withholding per paycheck and does not determine final federal or state tax liability.
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Calculations are simplified and for guidance only. Always double-check results and current rules with official sources or a qualified professional before making financial decisions.