2026 official-source estimate

Illinois Paycheck Calculator

Estimate Illinois withholding with the 2026 IL-700-T automated payroll method and Form IL-W-4 allowances.

Tax year 2026Last verified July 16, 2026

Your paycheck details

Numbers stay in this browser and are recalculated as you type.

Example pay values are prefilled

Replace them with your own paycheck information. WageFrame did not read or save personal wage data.

Pay classification

Annual salaryGross pay this period: $2,400.00Paycheck datePay frequency

Work locations and home state

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Federal withholding profile

Federal filing status

Federal W-4 adjustments

Two jobs or spouse works (Form W-4 Step 2)Select this only when Step 2 on the employee's current W-4 applies.Exempt from 2026 federal income tax withholdingSelect only if you meet the exemption conditions on the 2026 Form W-4. This does not exempt Social Security or Medicare.Step 3 credits (annual)Step 4(a) other incomeStep 4(b) deductionsStep 4(c) extra per paycheck

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Year-to-date wages and other deductions

YTD Social Security wagesYTD Medicare wagesOther after-tax deductions

State withholding details

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Included

What this estimate covers

Federal income tax withholding
Social Security and Medicare
2026 Illinois 4.95% withholding method
Form IL-W-4 Line 1 and Line 2 allowances

Limitations

What is not included

Unentered employer benefits and unsupported deduction treatments
Reciprocity and nonresident exceptions
Prior-period payroll corrections
Employer-specific payroll settings

How the Illinois estimate works

Enter gross pay for one pay period, federal W-4 adjustments, and the state details shown above. Federal withholding follows Publication 15-T. Illinois uses the automated payroll formula in the 2026 IL-700-T: current wages are reduced by the pay-period value of the employee's Form IL-W-4 Line 1 and Line 2 allowances, then the 4.95% withholding rate and any additional amount are applied.

Example: Line 1 and Line 2 allowances have different annual values under IL-700-T, so the calculator asks for them separately rather than combining them. The calculator does not assume any unentered benefit deduction or invent a tax result.

Weekly, biweekly, semimonthly, and monthly are the supported paycheck frequencies. “Annual salary” is an earnings input and the annual view is a simple period multiplication; neither is an annual payroll-period method. The special Form W-4 adjustment for nonresident aliens is not modeled.

Source trail

Official data used on this page

Each rule is versioned and reviewed before production use.

Publication 15-T, Federal Income Tax Withholding MethodsInternal Revenue Service · us-2026.1 · Verified 2026-07-15 Publication 15, Employer's Tax GuideInternal Revenue Service · fica-2026.1 · Verified 2026-07-15 Retirement plan contribution withholding FAQInternal Revenue Service · irs-retirement-contributions-current.1 · Verified 2026-07-16 Publication 15-B, Employer's Tax Guide to Fringe BenefitsInternal Revenue Service · irs-p15b-2026.1 · Verified 2026-07-16 2026 Form W-4, Employee's Withholding CertificateInternal Revenue Service · w4-2026.1 · Verified 2026-07-15 2026 COLA Fact Sheet — Social Security taxable maximum cross-checkSocial Security Administration · ssa-2026.1 · Verified 2026-07-15 2026 IL-700-T Illinois Withholding Tax TablesIllinois Department of Revenue · il-2026.1 · Verified 2026-07-15

See every checksum and effective date on the tax data sources page.