Illinois Paycheck Calculator
Illinois tells employers to withhold 4.95% after exemption allowances. For 2026 the allowance is $2,925, and it phases out above $250,000 of income ($500,000 joint). Line 2 of Form IL-W-4, the extra $1,000 allowance, is not a separate field. Add one allowance if you claim it. Reciprocity with Iowa, Kentucky, Michigan, and Wisconsin can move the state line if you live in one state and work in another.
How the state line is figured
Illinois tells employers to withhold 4.95% after exemption allowances. For 2026 the allowance is $2,925, and it phases out above $250,000 of income ($500,000 joint). Line 2 of Form IL-W-4, the extra $1,000 allowance, is not a separate field. Add one allowance if you claim it. Reciprocity with Iowa, Kentucky, Michigan, and Wisconsin can move the state line if you live in one state and work in another.
Withholding: 4.95% after the exemption allowance.
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Questions
Does Illinois tax wages?
Illinois taxes wages. Withholding: 4.95% after the exemption allowance. The top rate used on this page is 4.95%.
Is this the amount an employer will withhold?
The state line uses an employer method we transcribed. Federal withholding uses IRS Publication 15-T. A stub can still differ because of benefits, local tax, or a different W-4.
What else is withheld?
Social Security is 6.2% up to $184,500. Medicare is 1.45%, plus 0.9% after $200,000 from one employer. Payroll programs we could verify are listed on the paycheck.
Does Illinois have local wage tax?
Illinois has no employee local wage tax in this calculator.
Why might my pay stub differ?
This page assumes you live and work in the same state. Reciprocity, pre-tax benefits, and a different allowance count can change the state line.