Money
Illinois Paycheck Calculator
Last updated: June 19, 2026
An Illinois paycheck calculator is a specialized financial tool designed to estimate take-home pay for employees working in the state of Illinois. It calculates net pay by subtracting federal income tax withholding, FICA taxes (Social Security and Medicare), and Illinois's flat-rate state income tax from gross earnings. The tool also accounts for standard pay frequencies, filing statuses, federal W-4 options, and user-specified pre-tax deductions like health insurance or retirement plans, as well as post-tax deductions. Employees use it to model paycheck adjustments and verify withholdings.
Enter gross pay, pay frequency, filing status, and deductions. The calculator estimates Illinois take-home pay using 2025 federal brackets, FICA, and the Illinois flat state income tax (editable, 4.95% default).
Quick Answer
Calculate your Illinois take-home pay. Enter your salary, pay frequency, filing status, and deductions to see your net paycheck estimate.
What appears as gross on one Illinois pay stub before taxes or deductions. · e.g. 2,000
Per paycheck. 401(k), HSA, traditional health premiums. · e.g. 0
Per paycheck. Roth 401(k), union dues, garnishments. · e.g. 0
Illinois has a flat individual income tax (4.95% as of 2025). Editable in case the rate changes. · e.g. 4.95
About Illinois income tax
Illinois imposes a flat individual income tax (4.95% as of 2025). Real returns also include an Illinois personal exemption and various credits that this calculator does not model. Local payroll fees are not included.
Estimated net pay (biweekly)
$1,586.40
Gross $2,000.00 · annual net $41,246.50
Estimate only. Real Illinois paychecks depend on exact W-4 and IL-W-4 settings, personal exemptions, credits, benefits, and local fees. Not payroll or tax advice.
Examples
$2,000 biweekly · single · 4.95% IL
Annual gross $52,000 · net ≈ $1,550/check
$5,000 monthly · married jointly · 4.95% IL
Annual gross $60,000 · net ≈ $4,350/month
$3,000 biweekly · single · $300 401(k) · 4.95% IL
Annual gross $78,000 · net ≈ $2,180/check
$80,000 salary · biweekly · single · 4.95% IL
Net ≈ $2,300/check
How it works
The calculator annualizes gross pay, subtracts pre-tax deductions and the federal standard deduction, applies 2025 federal brackets and FICA, and adds the Illinois flat-rate state income tax.
Federal taxable · annual_gross − pre_tax − standard_deduction
FICA · 6.2% SS (up to wage base) + 1.45% Medicare (+0.9% high earner)
Illinois tax · (annual_gross − pre_tax) × state_rate
Net pay · gross − pre_tax − federal − FICA − IL − post_tax
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- Paycheck calculator for the general (any-state) paycheck estimate.
- Texas paycheck calculator for the no-state-income-tax comparison.
- Florida paycheck calculator for another no-income-tax state.
- Tax bracket calculator for the federal marginal-vs-effective rate breakdown.
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Disclaimer. Planning estimate based on 2025 federal brackets, the federal standard deduction, FICA, and a single flat Illinois state rate. Does not handle Illinois personal exemptions, dependent credits, itemized deductions, supplemental wages, equity comp, or local fees. Not tax, legal, or payroll advice.
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Frequently asked questions
Yes. Illinois has a flat individual income tax, 4.95% as of 2025. There are no progressive brackets; everyone pays the same percentage on Illinois taxable income (with some exemptions and credits). The rate is editable in the calculator in case it changes.
Annualize your gross pay, subtract pre-tax deductions and the federal standard deduction for your filing status, apply the 2025 federal income-tax brackets, and add Social Security (6.2% up to the wage base) plus Medicare (1.45%, plus 0.9% above the high-earner threshold). Then apply the Illinois flat rate to gross minus pre-tax. The remainder, minus post-tax deductions, is net pay.
Illinois allows a personal exemption (a small flat amount, increased for dependents) that reduces Illinois taxable income before the flat rate is applied. This calculator does not model the personal exemption to keep the math simple; for an exact W-4-style estimate, subtract the current personal exemption from gross before applying the state rate.
Real paychecks use the IRS percentage method against your W-4 and the Illinois IL-W-4 form, plus any additional withholding, credits, employer benefit plans, and the exact period. This calculator uses 2025 federal brackets and the federal standard deduction for a planning estimate.
Pre-tax 401(k) reduces federal taxable wages. For Illinois state purposes, traditional 401(k) contributions are also typically subtracted from state taxable wages (since they reduce federal AGI). Enter your pre-tax deduction per paycheck and the calculator subtracts it from gross before applying both federal and state taxes.
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