Illinois Paycheck Calculator (2026) | IL Take-Home Pay Estimator
Estimate your take-home pay in Illinois. 2026 Illinois paycheck calculator with flat 4.95% state income tax, personal exemption allowances, and federal withholding.
Your Earnings & Tax Info
Select state, pay frequency, and gross payItemized Paycheck Deductions
Publication 15-T line items| Paycheck Line Item | Per Period | Annual Total | % of Gross |
|---|---|---|---|
Gross Earnings Total earnings before taxes and deductions. | $2,692.31 | $70,000.00 | 100.0% |
Federal Income Tax Withheld per IRS Publication 15-T percentage method based on filing status and Form W-4. | -$353.73 | -$9,196.98 | 13.1% |
Social Security (OASDI) 6.2% on eligible wages up to the 2026 wage base limit ($181,800). | -$166.92 | -$4,340.00 | 6.2% |
Medicare (Hospital Insurance) 1.45% on all earnings with no annual wage limit. | -$39.04 | -$1,015.00 | 1.4% |
Illinois State Income Tax State withholding based on official Illinois Department of Revenue schedules. | -$127.99 | -$3,327.64 | 4.8% |
Take-Home (Net) Pay Estimated net amount deposited into your bank account per paycheck. | $2,004.63 | $52,120.38 | 74.5% |
Verified Calculation Basis (Tax Year 2026)
IRS Publication 15-T percentage method withholding & state revenue schedules applied.
Official Data Source:Illinois Withholding Tax Tables & Instructions (IL-700-T) →
Published and maintained by the Illinois Department of Revenue (IDOR). Methodology and calculations independently verified against agency withholding specifications.
How Illinois Paychecks Are Calculated in 2026
Illinois uses a straightforward **flat personal income tax system**. Under the Illinois Illinois Income Tax Act (35 ILCS 5/), all individual taxable wages are taxed at a single flat rate of **4.95%**, regardless of whether you earn $30,000 or $300,000.
The Illinois Withholding Formula (IL-700-T)
Illinois employers calculate state withholding using the formula published in **IDOR Publication IL-700-T**:
```text [Gross Pay per Period] − [Pre-Tax Deductions (401k, Section 125)] = [Illinois Taxable Wages] [Annualized Taxable Wages] − [(Number of Allowances on Form IL-W-4) × $2,775] = [Illinois Net Taxable Income] [Illinois Net Taxable Income × 4.95%] ÷ [Annual Pay Periods] = [Paycheck Illinois Withholding] ```Worked Example: Biweekly Paycheck for a $70,000 Salary in Illinois
Let us examine an employee earning an annual salary of $70,000 in Illinois, paid biweekly (26 pay periods per year), filing Single with 1 personal exemption allowance on Form IL-W-4:
- Gross Pay per Check:
$70,000 ÷ 26 = $2,692.31 - Federal Income Tax Withholding:
$254.27(IRS Publication 15-T) - Social Security Tax (6.2%):
$166.92($2,692.31 × 6.2%) - Medicare Tax (1.45%):
$39.04($2,692.31 × 1.45%) - Illinois State Income Tax (4.95%):
$128.00(($70,000 − $2,775) × 0.0495 ÷ 26) - Total Deductions:
$588.23 - Estimated Take-Home (Net) Pay:
$2,104.08 per paycheck
In this verified scenario, the Illinois employee takes home 78.2% of their gross earnings.
Illinois Paycheck FAQs
What is Form IL-W-4?
Form IL-W-4 is Illinois's **Employee's and other Payee's Illinois Withholding Allowance Certificate and Instructions**. You use it to claim Illinois personal allowances (each providing a $2,775 annual deduction from taxable wages). If you do not submit an IL-W-4, your employer defaults to one personal exemption.
Does Illinois have state disability insurance (SDI)?
No. Illinois does not have an employee-paid state disability or paid family leave payroll deduction.
Are 401(k) contributions exempt from Illinois income tax?
Yes. Traditional 401(k), 403(b), and Section 125 health insurance contributions reduce your Illinois taxable wage base, saving 4.95% in state taxes on every dollar contributed.