Illinois Paycheck Calculator

Illinois Flat Tax: 4.95%

Unlike most states, Illinois uses a flat (single-rate) income tax of 4.95% on all taxable income — the same rate regardless of how much you earn. This makes estimating your Illinois tax straightforward.

Enter Your Gross Pay

Gross Pay ($)

Pay Frequency

Filing Status

401(k) Contribution (%)

Your Illinois Paycheck Breakdown

Gross Pay

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Total Deductions

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Net Take-Home

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Gross Pay —

Federal Income Tax —

Social Security (6.2%) —

Medicare (1.45%) —

Illinois State Tax (4.95% flat) —

401(k) Contribution —

Net Take-Home Pay —

Note: Illinois allows a personal exemption of $2,425 per filer (2026). This calculator applies that exemption. Chicago and some other IL municipalities levy additional local income taxes not shown here.

Illinois Tax Summary

Federal Income Tax	10% – 37% (progressive brackets)
Social Security	6.2% (up to $176,100 wage base)
Medicare	1.45% (+ 0.9% over $200k)
IL State Income Tax	4.95% flat rate
IL Personal Exemption	$2,425 per filer