Illinois Workers Comp Calculator
Estimate workers compensation insurance premiums for Illinois employers
Illinois Calculator
Get accurate results
Updated for 2025 with real Illinois rates, brackets, and regulations
Illinois requires virtually all employers to carry workers' compensation insurance under the Illinois Workers' Compensation Act (820 ILCS 305). Unlike many states, Illinois has no minimum employee threshold — even businesses with a single employee must provide coverage. The Illinois Workers' Compensation Commission (IWCC) oversees claims, while the National Council on Compensation Insurance (NCCI) sets class codes and advisory rates. Average workers' comp costs in Illinois are approximately $1.36 per $100 of payroll, though rates vary dramatically by industry — from $0.20 for office work to $10.00+ for high-risk construction. Our calculator estimates your premium based on NCCI class codes, payroll, and experience modification factor.
Calculate Your IL Tax
Estimated Annual WC Premium
$900
Rate per $100 Payroll
$0.18
Class Code
8810
Per Employee
$90/yr
Monthly Premium
$75
IL Avg Rate ($1.36/100)
$6,800
vs IL Avg
$-5,900
Max TTD Benefit
$1,677/wk
Breakdown
Insight
Workers' comp for Office/Clerical (Class 8810) in Illinois costs approximately $900/year on $500,000 payroll — $0.18 per $100. Illinois's average rate of $1.36/$100 is above the national average, largely due to high benefit costs and litigation. Illinois WC is MANDATORY for all employers (no opt-out like Texas). Key IL features: injured workers choose their own doctor; TTD benefits are 2/3 of avg weekly wage up to $1,677/week; IL has one of the longest statute of limitations for claims (3 years). Chicago-area employers typically see 15-25% higher rates than downstate due to higher wages and medical costs.
AI Explanation
What This Means
Based on default inputs, the Illinois Workers Comp Calculator shows a estimated annual wc premium of $900. Key figures: Rate per $100 Payroll: $0.18, Class Code: 8810, Per Employee: $90/yr, Monthly Premium: $75, IL Avg Rate ($1.36/100): $6,800, vs IL Avg: $-5,900, Max TTD Benefit: $1,677/wk.
Key Insights
Workers' comp for Office/Clerical (Class 8810) in Illinois costs approximately $900/year on $500,000 payroll — $0.18 per $100. Illinois's average rate of $1.36/$100 is above the national average, largely due to high benefit costs and litigation. Illinois WC is MANDATORY for all employers (no opt-out like Texas). Key IL features: injured workers choose their own doctor; TTD benefits are 2/3 of avg weekly wage up to $1,677/week; IL has one of the longest statute of limitations for claims (3 years). Chicago-area employers typically see 15-25% higher rates than downstate due to higher wages and medical costs.
What You Can Do
Enter your actual figures in the calculator above for a personalized breakdown. Consider consulting a tax professional for comprehensive planning, especially for complex situations involving multiple income sources or deductions.
Keep In Mind
This calculator provides estimates based on 2026 rates. Actual tax liability may vary based on credits, exemptions, and other factors not captured here. This is for educational purposes only and should not be considered tax advice.
How the Illinois Workers Comp Calculator Works
The Illinois Workers Comp Calculator uses 2026 tax rates, brackets, and deductions specific to Illinois to provide you with an accurate estimate of your tax obligations. Unlike generic federal-only calculators, this tool accounts for the unique tax structure that Illinois residents face.
Formula
WC Premium = (Payroll / 100) x Class Rate x Experience Modifier. Average IL rate: $1.36/$100 payroll. Class rates vary: Office ~$0.20, Retail ~$0.90, Roofing ~$10.00+ per $100. E-mod 1.0 = average claims history.Simply enter your financial details above, and the calculator instantly computes your results using the latest available data. All calculations happen directly in your browser — your personal information is never sent to any server or stored anywhere.
Why Use a Illinois-Specific Calculator?
State-Specific Rates
Uses real 2026 Illinois tax brackets, rates, and thresholds — not generic national averages that miss state-level nuances.
Local Programs & Exemptions
Factors in Illinois-specific programs, exemptions, and deductions that national calculators simply don't account for.
Instant & Private
All calculations run locally in your browser. No account required, no data stored, no waiting for results.
AI-Powered Explanations
Get a plain-English breakdown of your results with actionable insights you can actually use for financial planning.
What's Included
NCCI Rate Lookup
Get accurate workers' comp rates for your NCCI class code as approved by the Illinois DOI.
Experience Modifier Impact
See how your claims history raises or lowers your premium through the experience modification factor.
Universal Coverage Check
Illinois requires coverage for all employers with 1+ employee — verify your obligations and exemptions.
IWCC Benefit Estimator
Estimate TTD, PPD, and death benefits that injured workers receive under Illinois Workers' Comp Act.
Frequently Asked Questions
Is workers comp required in Illinois?
Yes — Illinois requires workers' compensation insurance for nearly all employers, including those with just one employee. This is stricter than many states that set a minimum employee threshold. Sole proprietors and partners can elect to exclude themselves from coverage. Failure to carry workers' comp is a criminal offense in Illinois (Class 4 felony for repeat violations) with penalties up to $500 per day of non-compliance.
How much does workers comp cost in Illinois?
The statewide average is approximately $1.36 per $100 of payroll. Actual rates depend on your NCCI class code: office/clerical work ~$0.20, retail ~$0.90, restaurants ~$1.50, general construction ~$4.00-6.00, and roofing can exceed $10.00 per $100. A small restaurant with $300,000 payroll at $1.50 rate pays roughly $4,500/year before experience modifier adjustments.
What benefits do injured workers receive in Illinois?
Illinois workers' comp provides: all reasonable medical treatment, Temporary Total Disability (TTD) at 66.67% of average weekly wage (max $1,895.68/week in 2024), Permanent Partial Disability (PPD) based on body part and impairment rating, maintenance and vocational rehabilitation, and death benefits of $500,000 maximum plus $8,000 burial. There is a 3-day waiting period for TTD benefits, retroactive if disability lasts 14+ days.
Can Illinois employers self-insure for workers comp?
Yes — Illinois allows self-insurance for employers who demonstrate sufficient financial capacity. Applicants must apply to the Illinois Workers' Compensation Commission, provide financial statements showing adequate reserves, and post a surety bond or deposit securities. Most self-insured employers in Illinois are large corporations or public entities. Group self-insurance is also permitted for associations of employers.
How is the experience modifier calculated in Illinois?
The experience modification factor (e-mod) is calculated by NCCI based on your 3-year claims history compared to the industry average. An e-mod of 1.0 means average. Below 1.0 means fewer/smaller claims than average (lower premium). Above 1.0 means more claims (higher premium). An e-mod of 0.80 gives you a 20% discount; 1.30 means a 30% surcharge. Reducing claims through workplace safety programs is the most effective way to lower your e-mod.
Important Information for Illinois Residents
Tax laws in Illinois can change annually. This calculator is updated regularly to reflect the latest 2026 rates and regulations, but you should always verify important financial decisions with a qualified Illinois tax professional or CPA.
This tool is designed for informational and educational purposes. While we strive for accuracy using official Illinois Department of Taxation data, the results should be used as estimates for planning purposes only. Your actual tax liability may differ based on credits, special circumstances, and legislative changes that occur after our last update.
For filing deadlines, payment schedules, and official forms, visit the Illinois Department of Taxation and Finance website. If you have complex tax situations involving multiple states, business income, or significant investment gains, professional guidance is recommended.
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