C

Illinois Paycheck Calculator

Last updated: March 11, 2026
Reviewed by: LumoCalculator Team

Estimate per-paycheck and annual take-home pay for Illinois salary or hourly income. Review federal, Illinois, and FICA withholding assumptions in one place so compensation and budgeting decisions are easier to audit before payroll changes.

Illinois Paycheck Inputs

Estimate take-home pay using federal withholding, Illinois flat tax, FICA, and optional local surcharge assumptions.

Quick Scenarios

Income Type
$

Use this only if your pay stub includes a location-based wage surcharge.

Paycheck Estimate

Estimated take-home pay (Bi-weekly)

$2,230.03

Gross $2,884.62 - Deductions $654.59

Gross pay per period

$2,884.62

Total deductions per period

$654.59

Total effective tax rate

22.69%

Illinois + local share

4.76%

Annual gross $75,000.00 projects to annual net $57,980.79 under the current filing-status and surcharge assumptions.

Withholding Breakdown

ComponentPer paycheckAnnualized
Federal income tax-$296.69-$7,713.94
Illinois state tax (4.95%)-$137.22-$3,567.72
Local surcharge assumption-$0.00-$0.00
Social Security (6.2%, wage base $184,500.00)-$178.85-$4,650.10
Medicare (1.45%)-$41.83-$1,087.58

Assumption notes

  • Federal withholding uses 2026 bracket thresholds and standard deductions.
  • Illinois state income tax uses the 4.95% flat rate with one personal exemption baseline.
  • No local payroll surcharge is an optional scenario control, not a universal wage rule.

How to use this output

  • Match pay frequency and filing status to your latest pay stub settings.
  • Use annual net estimates for budgeting, then compare to actual payroll statements.
  • Re-run after W-4 changes, role changes, or major compensation updates.

Related Calculators

Editorial & Review Information

Reviewed on: 2026-03-11

Published on: 2024-12-27

Author: LumoCalculator Editorial Team

What we checked: Formula sequencing, tax-rate assumptions, example arithmetic, scenario clarity, and source accessibility.

Purpose and scope: This page supports payroll planning and compensation scenario review. It is not payroll filing software and not tax advice.

How to use this review: Start with current payroll settings, run one baseline and two alternatives, then compare output with your latest pay stub before acting.

Use Scenarios

Offer evaluation

Compare two compensation offers by converting salary or hourly terms into projected net pay across the same filing status and pay frequency.

Budget planning

Build a monthly cash-flow plan from annual net projections, then stress test with a conservative withholding scenario before committing fixed expenses.

Interstate comparison

If you are comparing relocation outcomes, run this output next to a no-state-tax paycheck scenario with the Florida Paycheck Calculator to isolate state-tax and payroll structure differences.

Formula Explanation

1) Gross pay model

Annual salary mode: Gross per check = Annual salary / pay periods

Hourly mode: Annual gross = Hourly wage x weekly hours x 52

Hourly gross per check = Annual gross / pay periods

If you need to model gross earnings from shifts and schedules first, use the Hourly Pay Calculator before comparing withholding outcomes.

2) Federal withholding estimate

Taxable income uses annual gross minus the 2026 standard deduction for the selected filing status. Progressive federal brackets are then applied segment by segment.

This produces an annual federal estimate, which is converted into a per-paycheck value using the selected pay frequency.

3) Illinois state and optional local component

Illinois taxable estimate = Annual gross - personal exemption baseline

Illinois state withholding = Illinois taxable estimate x 4.95%

The local surcharge field is optional and is intended for user-defined scenario testing when a location-specific wage deduction appears on payroll records.

4) FICA and net pay

Social Security = min(annual gross, wage base) x 6.2%

Medicare = annual gross x 1.45%

Additional Medicare = max(0, annual gross - threshold) x 0.9%

Net pay is gross pay minus federal, state, local assumption, Social Security, Medicare, and any Additional Medicare component.

Example Cases

Case 1: Single salary baseline

Inputs

  • Salary type: Annual
  • Annual salary: $75,000
  • Pay frequency: Bi-weekly (26)
  • Filing status: Single
  • Local surcharge: 0.0%

Computed Results

  • Gross per check: about $2,884.62
  • Total deductions per check: about $654.59
  • Net pay per check: about $2,230.03
  • Annual net pay: about $57,980.79

Interpretation

With no local surcharge assumption, federal and FICA remain the largest payroll reductions in this income range.

Decision Hint

Use this as your baseline and compare against post-raise or W-4 update scenarios.

Case 2: Married monthly planning

Inputs

  • Salary type: Annual
  • Annual salary: $125,000
  • Pay frequency: Monthly (12)
  • Filing status: Married filing jointly
  • Local surcharge: 0.0%

Computed Results

  • Gross per check: about $10,416.67
  • Total deductions per check: about $2,191.10
  • Net pay per check: about $8,225.57
  • Annual net pay: about $98,706.79

Interpretation

Joint filing can materially change federal withholding compared with a single-filer baseline at the same annual wage.

Decision Hint

Compare this monthly case against a bi-weekly payroll setup to evaluate cash flow timing.

Case 3: Hourly plus local scenario

Inputs

  • Salary type: Hourly
  • Hourly wage: $22.00
  • Hours per week: 38
  • Pay frequency: Weekly (52)
  • Filing status: Single
  • Local surcharge assumption: 0.5%

Computed Results

  • Annual gross estimate: about $43,472.00
  • Gross per check: about $836.00
  • Total deductions per check: about $165.59
  • Net pay per check: about $670.41

Interpretation

At lower wages, paycheck-level changes from local assumptions may still matter for weekly budgets.

Decision Hint

Keep local surcharge at zero unless your actual payroll records show a location-specific deduction.

Boundary Conditions

Input wages must be positive, and weekly hours should reflect realistic payroll limits.
Federal withholding is an estimate and does not replace employer payroll tables or tax filing rules.
The calculator assumes one Illinois personal exemption baseline and does not model dependent counts.
Bonus checks, commissions, and supplemental wage methods can produce different withholding outcomes.
Additional Medicare results can vary during the year when payroll crosses thresholds mid-cycle.
Use local surcharge controls only for user-specific payroll assumptions, not as a universal default.

Sources & References

Frequently Asked Questions

How does this Illinois paycheck calculator estimate net pay?
The workflow is gross pay first, withholding second, net pay last. Gross pay comes from either annual salary divided by pay periods or hourly wage times weekly hours times 52, then divided by pay periods. Federal withholding is estimated from progressive brackets and standard deduction assumptions. Illinois state withholding is estimated with the 4.95 percent flat rate and a single personal exemption baseline. FICA includes Social Security and Medicare, and Additional Medicare is added when annual wages exceed the threshold for your filing status. Net pay is gross pay minus all withholding components. Use this as a planning estimate and compare against real payroll statements for final numbers.
Does Illinois have a flat income tax rate?
Yes. Illinois applies a flat state income tax rate of 4.95 percent. That means the state rate itself does not step through brackets the way federal tax does. In paycheck planning, this usually makes the state portion easier to audit because the rate is stable while the taxable base changes with exemption assumptions and wage level. This page applies one personal exemption baseline for a transparent estimate. If your payroll setup or filing profile differs, treat the result as a directional planning value and reconcile with your pay stub withholding records.
Why can my actual paycheck differ from this estimate?
Real payroll can differ for several reasons: pre-tax benefits, retirement contributions, health insurance premiums, commuter programs, supplemental wages, or employer-specific withholding methods. Your W-4 selections also change federal withholding, and Additional Medicare applies only above threshold wages. If your employer uses separate supplemental withholding logic for bonuses, a bonus check can look very different from a regular cycle check. This calculator is built for transparent planning, not payroll filing compliance. Use it to compare scenarios quickly, then validate with HR/payroll records and year-to-date statements.
How should I use the local surcharge field?
The local surcharge control is optional and is provided for scenario testing only. Many Illinois workers use zero here, but some users want to model location-based payroll burdens or special local assumptions from their own compensation documents. If your pay stub shows no local wage withholding, keep this at zero. If your payroll records show a location-specific wage deduction, select the closest scenario and then reconcile against your actual amount. This setting should be treated as a planning variable, not as a universal rule for every Illinois employee.
What pay frequency should I select?
Choose the exact frequency used on your payroll cycle because this directly changes per-paycheck gross and withholding amounts. Weekly, bi-weekly, semi-monthly, and monthly can produce different check sizes even when annual salary is unchanged. Semi-monthly and bi-weekly are often confused: semi-monthly runs 24 checks per year, while bi-weekly runs 26 checks per year. If you are unsure, verify with your latest pay stub. For budgeting, it can help to compare two frequencies side by side to see cash flow timing differences.
How is Additional Medicare tax handled?
Additional Medicare tax is modeled at 0.9 percent on wages above filing-status thresholds. Thresholds differ by filing status, so two households with the same gross income can produce different Additional Medicare outcomes. The base Medicare portion (1.45 percent) still applies to all wages, and Social Security withholding has a wage base cap. This calculator applies those assumptions in annual form and then converts to paycheck form by frequency. If your year-to-date payroll already crossed thresholds partway through the year, your real paycheck pattern may differ from a simple full-year average.
Can I use this calculator for bonus checks or irregular compensation?
Use caution for bonuses, commissions, or irregular pay. Employers can apply supplemental withholding methods that differ from regular payroll calculation, and timing effects can temporarily change effective withholding rates. The calculator is strongest for recurring payroll planning and before-and-after scenario comparisons. For one-time payouts, run a separate scenario with the bonus included and treat the outcome as directional. Then compare with employer payroll policy and expected year-end reconciliation.
How can I improve paycheck planning accuracy?
Start with your latest pay stub and match frequency, filing status, and wage structure exactly. Then run at least three scenarios: current baseline, expected raise or hour change, and conservative withholding case. Review annual net pay, per-paycheck deductions, and total effective withholding together instead of focusing on a single number. Re-run the model when you update W-4 elections, change roles, or adjust benefit elections. This approach makes payroll changes easier to explain and helps avoid budget surprises.