US PAYCHECK CALCULATOR / ILLINOIS

Illinois
paycheck calculator.

Illinois payroll uses IL-W-4 allowances, separately from your federal W-4. The 2026 formula applies 4.95% after the state allowance deduction.

01 / YOUR PAYCHECK

Your pay details

Pay entered as

Annual salary ($)

Pay frequency

Work state

Federal filing status

Regular resident payroll · work: Illinois · residence: Illinois. Date: 2026-08-31. YTD Social Security: $0; Medicare: $0. Review the state form and W-4 settings below; initial values may not match your paystub.

Refine deductions & payroll details ↓

Paycheck date, residence & year-to-date wages

Paycheck date

Residence state

Prior Social Security wages ($)

Prior Medicare wages ($)

YTD amounts are with this employer before this check. Different work and residence states are not supported; we will flag them rather than estimate cross-state taxes.

Federal W-4 & payroll deductions

W-4 Step 2 checkbox is checked

2020-or-later W-4 only. Benefits must already qualify under your employer plan; this tool does not determine contribution eligibility or annual limits.

Step 3: annual credits ($)

Step 4(a): annual income ($)

Step 4(b): annual deductions ($)

Step 4(c): extra per check ($)

Traditional 401(k) per check ($)

Not Roth. Reduces income-tax wages but not FICA.

Section 125 health premium ($)

Qualified accident/health insurance premium only; not FSA, dependent care, life insurance or HSA.

After-tax deductions ($)

I have a valid federal withholding exemption (FICA still applies)

Illinois state form — review defaults

Additional state withholding ($)

IL-W-4 line 1 allowances

IL-W-4 line 2 allowances

I have a valid exemption from this state’s income withholding

Local payroll charges — not confirmed

Check your paystub for local or other employee payroll charges not already entered as benefits or after-tax deductions.

Ask your employer: “Are any local or other payroll charges missing from this breakdown, and how much applies to this paycheck?” If you do not know, leave the confirmation unchecked. Where local confirmation is required, the result stays partial.

Local / other charges this paycheck ($)

Enter a confirmed dollar amount, including 0 if payroll confirms none. Changing this amount clears confirmation.

I checked with payroll or my paystub: this local amount is correct

Use each deduction once. Do not repeat amounts entered under benefits or after-tax deductions.

Estimates only. Annual salary assumes equal regular paychecks. Variable pay, tips, multiple employers and nonresident-alien rules require separate review.

Calculated in your browser. No salary entries saved or transmitted by this tool.

How Illinois withholding is handled

Illinois payroll uses IL-W-4 allowances, separately from your federal W-4. The 2026 formula applies 4.95% after the state allowance deduction.

A state withholding example

Weekly state-taxable wages of $300, two line 1 allowances and one line 2 allowance give $8.33 using the formula. A wage-band table can produce a slightly different amount.

Coverage limits

Enter line 1 and line 2 allowances separately: their annual values are $2,925 and $1,000. This calculator uses the exact-wage formula, not the wage-band lookup.

Regular resident W-2 wages only. Use confirmed local/other payroll charges where required. No tax-return, reciprocity, nonresident-alien or special-occupation calculations. Benefit entries must qualify under your employer’s plan.

Official sources

Illinois official payroll source 1

Sources reviewed August 31, 2026. Read the complete method and privacy boundaries.

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