Illinois Paycheck Calculator

Use one pay period, the 2026 Form W-4 settings, and the Illinois certificate fields shown by the calculator. Federal, state, local, and supported employee payroll items are calculated separately so the estimate can be audited.

Inputs

Results update as you type.

* Required

Tax yearGross pay for this pay periodPay frequencyFederal filing statusPre-tax deductions this paycheckTotal deductions taken from net pay that reduce federal and state planning wages.FICA-exempt portion of pre-tax deductionsEnter only the portion excluded from Social Security and Medicare wages, such as qualifying Section 125 health, FSA, or HSA deductions. Do not include a traditional 401(k) contribution here.YTD Social Security wages before this paycheckYTD Medicare wages before this paycheckUsed independently for the employer-level $200,000 Additional Medicare Tax withholding threshold.Form W-4 Step 2 checkboxForm W-4 Step 3 annual creditsForm W-4 Step 4(a) annual other incomeForm W-4 Step 4(b) annual deductionsForm W-4 Step 4(c) extra per paycheckIllinois IL-W-4 Line 1 allowancesIllinois IL-W-4 Line 2 allowancesAdditional Illinois withholding per paycheck

Result

Results update as you type.

Estimate basis: 2026 tax tables
Estimated net pay: $1,974.41
Federal income tax: $216.15
Social Security tax: $155.00
Medicare tax: $36.25
Additional Medicare tax: $0.00
Illinois income tax withholding: $118.18
Local income tax withholding: $0.00
Total estimated taxes and payroll premiums: $525.59

Was this calculator helpful?

How to use the Illinois Paycheck Calculator

Review the 2026 IRS and Illinois source dates, certificate entries, which deductions are actually FICA-exempt, every year-to-date wage base, locality, exemptions, and whether the employer pays any employee program premium.

Read the estimate basis, estimated net pay, federal and FICA items, Illinois income tax withholding, supported local and payroll-program items, and total estimated taxes and premiums.

Formula

Illinois estimated net pay = gross pay − pre-tax deductions − 2026 federal withholding − Social Security − Medicare − calculated Illinois withholding − supported local taxes and employee payroll premiums.

Example

If a Illinois pay period has $2,000 gross pay, no pre-tax deduction, and the displayed federal, FICA, state, and local taxes total $410, estimated net pay is $1,590.

Assumptions and limitations

Illinois withholding must use the selected year’s Department of Revenue rate, allowance, and withholding instructions. This is a 2026 planning estimate, not payroll or tax advice; employer benefit treatment, reciprocity, exemptions, supplemental wages, and unlisted local programs can change the actual check.
Illinois Paycheck Calculator treats the entered values as estimates and does not infer missing project, account, or personal details.
Calculations retain working precision except where the cited method requires an intermediate rounding step; displayed values are then formatted separately. Source rules and dated rates must be rechecked when they change.

Sources

Internal Revenue Service: Publication 15-T, Federal Income Tax Withholding MethodsFederal payroll withholding methods and tax-year tables. Reviewed 2026-08-14.
Illinois Department of Revenue: Withholding Income TaxThe Withholding Income Tax rules and withholding guidance. Reviewed 2026-08-14.
Internal Revenue Service: Publication 15-T (2026), Federal Income Tax Withholding MethodsOfficial formula, rate, or program guidance used by this calculator. Reviewed 2026-08-14.
Social Security Administration: Contribution and Benefit Base DeterminationOfficial formula, rate, or program guidance used by this calculator. Reviewed 2026-08-14.
Internal Revenue Service: Questions and Answers for the Additional Medicare TaxOfficial formula, rate, or program guidance used by this calculator. Reviewed 2026-08-14.
Internal Revenue Service: Publication 15-B (2026), Employer's Tax Guide to Fringe BenefitsOfficial formula, rate, or program guidance used by this calculator. Reviewed 2026-08-14.
Illinois Department of Revenue: 2026 IL-700-T withholding guide and tablesOfficial formula, rate, or program guidance used by this calculator. Reviewed 2026-08-14.

Related paycheck calculators

Frequently asked questions

How does the Illinois Paycheck Calculator work?

What information should I enter in the Illinois Paycheck Calculator?

Enter tax year, gross pay, pay frequency, filing status, total pre-tax deductions, the portion exempt from FICA, separate year-to-date wage bases, Form W-4 Steps 2 through 4, and the displayed Illinois withholding-certificate, locality, and payroll-program settings, then verify the 2026 IRS and Illinois source dates, certificate entries, which deductions are actually FICA-exempt, every year-to-date wage base, locality, exemptions, and whether the employer pays any employee program premium.

What should I verify before using this Illinois Paycheck Calculator result?

Illinois withholding must use the selected year’s Department of Revenue rate, allowance, and withholding instructions. This is a 2026 planning estimate, not payroll or tax advice; employer benefit treatment, reciprocity, exemptions, supplemental wages, and unlisted local programs can change the actual check.

Reviewed 2026-08-14 · 2026.3.0 · content-2026-08-14 · Trusty Calculator Editorial Team