Illinois Paycheck Calculator — Manual State Withholding
Calculate gross earnings, federal withholding, FICA and take-home pay for a Illinois employee. Enter Illinois state withholding from the official instructions or reviewed payroll records. State and local taxes are not automatic.
Tax year and calculation coverage
Supported tax year: 2026 for federal estimates. Illinois state withholding is a required manual dollar input; this page does not implement automatic state tax tables. Local taxes and other payroll levies are also manual. Enter 0 only after confirming none applies.
Your details
How this calculator works
Choose pay frequency and hourly, annual salary or known gross wages. Enter federal W-4 information and actual deductions. Obtain Illinois withholding separately using IL-W-4 and current official guidance, then enter the dollar amount for this same pay period. Enter local/other levies once, including an explicit zero if none applies.
Example calculation
Hourly example: $25 × 80 regular hours = $2,000 biweekly gross. Salary example: $52,000 ÷ 26 = $2,000. With Single federal W-4, no adjustments, no deductions and no prior taxable wages, federal withholding is $156.15, Social Security $124 and Medicare $29. Before state/local inputs, $1,690.85 remains. Hypothetical state withholding of $100 and local/other levies of $10 leave $1,580.85. Those manual amounts are arithmetic illustrations, not Illinois tax estimates.
2026 methodology & assumptions
For regular U.S. employee wages with a 2020-or-later W-4. This estimate uses 52 weekly, 26 biweekly, 24 semi-monthly or 12 monthly pay periods. Federal withholding follows IRS Publication 15-T Worksheet 1A. Amounts are rounded to cents.
Social Security uses a $184,500 wage limit and 6.2% employee rate; Medicare uses 1.45%. Additional Medicare withholding is 0.9% on wages above $200,000 paid by the same employer, regardless of filing status. Enter year-to-date taxable wages before this paycheck to model those thresholds.
Supplemental wages, nonresident-alien adjustments, self-employment tax, local taxes, special exemptions, and multi-state allocation are not automatically modeled. Overtime is not automatically treated as tax-free.
Frequently asked questions
Does this automatically apply Illinois IL-W-4 allowances?
No. Determine current-period state withholding from your payroll record or official IL-700-T instructions with your IL-W-4, then enter the dollar amount.
Is 4.95% of gross always the right deduction?
Do not assume so. Illinois exemptions and the applicable wage base affect withholding. This calculator accepts the final reviewed state amount rather than applying an unverified flat-rate shortcut.
Does this determine Illinois reciprocity treatment?
No. Review residence, work location and any applicable certificate with payroll and official Illinois guidance before choosing a state withholding amount.
Sources and calculation examples reviewed October 29, 2026. Supported estimate year: 2026. Official state instructions are references; automatic state support is limited to the coverage stated above.
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Hourly-to-Salary Calculator
Convert an hourly wage to daily, weekly, monthly and annual gross earnings, or estimate an hourly rate from an annual salary.
Calculations are estimates for informational purposes and may not reflect every tax, deduction, credit, local tax, or individual payroll situation. Verify important payroll and tax information with applicable government guidance or a qualified professional. Use the generator only for accurate, authorized payroll records.
Illinois withholding: obtain the state amount first
Illinois publishes a 4.95% withholding rate and a $2,925 exemption allowance for 2026. IL-W-4 allowances and payroll frequency affect the withholding amount. The federal W-4 credit field does not represent Illinois allowances.
Use the same pay dates, frequency and gross wages as your payroll record.
Review IL-W-4 separately from federal W-4.
Enter the reviewed state amount and any local or other levies once.
Check gross minus all taxes and employee deductions equals net.
How deductions change this estimate
Traditional retirement contributions reduce modeled federal income-tax wages, but not FICA wages. Qualifying pre-tax benefits reduce both federal income-tax and FICA wages here; use this field only when your plan has that treatment. Roth contributions, garnishments and other post-tax deductions reduce net pay without reducing modeled taxable wages. State treatment can differ: enter manual state withholding after accounting for the actual state treatment of your benefits. Do not subtract a benefit twice or treat employer contributions as employee deductions.
Local income taxes and other employee payroll levies are not calculated automatically. Enter their combined current-period amount once and keep the component amounts in your records. Supplemental-wage methods, multistate allocation, self-employment and special exemptions are outside this model.
Review wages, withholding and deductions against your records. Use the free tools for an estimate, then create a document only from accurate, authorized payroll information.