About the Illinois Paycheck Calculator

Illinois has a progressive state income tax with rates from 1% to 13.3% — among the highest in the nation. This calculator applies Illinois's actual 2025 tax brackets (not a flat estimated rate) alongside federal income tax, Social Security, and Medicare to give you a realistic take-home pay estimate.

Illinois's top rate of 13.3% applies to income over $1,000,000. Most middle-income workers pay an effective Illinois state rate of 4%–8% depending on income and filing status. The calculator uses Illinois's 2025 standard deduction ($5,202 single / $10,404 married) to compute state taxable income before applying brackets.

Note: This calculator does not include Illinois SDI (State Disability Insurance, approximately 1.1% in 2025) or the 1% Mental Health Services Tax on income over $1 million. Results are estimates — actual withholding depends on your DE-4 form elections and pre-tax deductions.

📚 Sources & Last Updated

Last updated: April 2026 · Tax year: 2026

How the Tax Formula Works

This calculator uses a bracket-based approach — the same method used to compute annual tax liability — divided by your pay periods. It is an estimate, not a payroll withholding calculation (which uses W-4 inputs and IRS Publication 15-T procedures).

1Gross Pay = Hourly Rate × Hours OR Annual Salary ÷ Pay Periods
2Federal Taxable Income = Annual Gross − Standard Deduction (2025: $15,000 single / $30,000 married)
3Federal Income Tax = Apply 2026 IRS brackets (10%→37%) ÷ pay periods
4Social Security = Gross × 6.2% (stops at $184,500 annual wages)
5Medicare = Gross × 1.45% (+0.9% on wages over $200K single)
6Illinois progressive brackets: 1% → 2% → 4% → 6% → 8% → 9.3% → 10.3% → 11.3% → 12.3% → 13.3% (applied to IL taxable income after $5,202 standard deduction)
7Net Take Home = Gross − Fed Tax − SS − Medicare − State Tax

Results are bracket-based estimates. Actual paycheck withholding is determined by your W-4 form, pre-tax deductions, and employer payroll procedures. Use these results for planning and budgeting — not as a substitute for your actual pay stub.

Frequently Asked Questions — Illinois Paycheck Calculator

Illinois has ten tax brackets in 2025 for single filers: 1% on income up to $10,756; 2% up to $25,499; 4% up to $40,245; 6% up to $55,866; 8% up to $70,606; 9.3% up to $360,659; 10.3% up to $432,787; 11.3% up to $721,314; 12.3% up to $1,000,000; and 13.3% above $1,000,000. Married filing jointly thresholds are approximately double.
A single Illinois filer earning $75,000 can expect approximately $52,000–$55,000 in annual take-home pay. Deductions include federal income tax (~$8,700 after standard deduction), Illinois state tax (~$4,200 after IL standard deduction), Social Security ($4,650), and Medicare ($1,088). Use the calculator above for a per-paycheck breakdown.
Illinois State Disability Insurance (SDI) is mandatory and funds short-term disability and paid family leave benefits. For 2025, SDI is withheld at approximately 1.1% of wages with no wage base cap. This calculator does not include SDI — your actual take-home pay will be slightly lower than shown if SDI applies to you.
Illinois employers use the DE-4 withholding form and the Illinois Employment Development Department (EDD) withholding tables to calculate state income tax each pay period. The calculator on this page estimates annual Illinois tax liability using 2025 brackets, then divides by your pay periods for a per-paycheck estimate.
Illinois's top marginal rate is 13.3% on income above $1 million (12.3% plus a 1% Mental Health Services Tax surcharge). For most workers, the relevant brackets are: 9.3% on income from $66,295 to $338,639 (single), and 10.3%/11.3%/12.3% above that for higher earners. A single worker earning $75,000 faces a 9.3% marginal rate on the portion above $66,295. Illinois's standard deduction is only $5,363 for single filers — much lower than the federal amount.
No. Illinois does not tax Social Security benefits at the state level. This is notable because federal tax may still apply to up to 85% of Social Security benefits depending on combined income — but Illinois exempts them entirely from state taxation.
Illinois's standard deduction is much lower than the federal standard deduction. For 2025, it is $5,202 for single filers and $10,404 for married filing jointly. Illinois does not automatically conform to federal standard deduction amounts, which is why Illinois taxable income is often higher than federal taxable income even for the same gross wages.
Illinois allows pre-tax 401(k) contributions to reduce both federal and Illinois taxable income. Illinois also conforms to most federal deductions and offers its own credits including the Illinois Earned Income Tax Credit (CalEITC) for lower-income workers. Contributing to a Illinois 529 college savings plan does not provide a state deduction, unlike many other states.

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