How Workers Comp Premiums Are Calculated in 2026
Workers compensation insurance premiums are calculated per $100 of annual payroll, using class code rates set by NCCI (National Council on Compensation Insurance) or state-specific rating bureaus. The formula is: (Annual Payroll ÷ 100) × Base Rate × E-Mod = Premium. Each variable in this formula is explained below.
Workers Comp Rates by Industry (Approximate 2026 Base Rates)
Rates vary enormously by job classification code. These are approximate NCCI national base rates — actual rates vary by state:
| Job Class | Typical Rate per $100 | Cost on $50,000 Payroll |
|---|---|---|
| Clerical / office (8810) | $0.35–$0.75 | $175–$375/yr |
| Retail store (8017) | $1.50–$2.50 | $750–$1,250/yr |
| Warehouse / freight | $3.00–$5.00 | $1,500–$2,500/yr |
| Carpentry / general construction | $8.00–$14.00 | $4,000–$7,000/yr |
| Roofing (5551) | $20.00–$35.00 | $10,000–$17,500/yr |
| Trucking / delivery drivers | $5.00–$9.00 | $2,500–$4,500/yr |
| Restaurant / food service | $1.50–$3.50 | $750–$1,750/yr |
| Healthcare / nursing | $2.00–$5.00 | $1,000–$2,500/yr |
What Is the Experience Modification Rate (EMR / E-Mod)?
The Experience Modification Rate (EMR, also called E-Mod or Experience Mod) is a multiplier applied to your workers comp base premium based on your actual claims history compared to similar businesses in your industry. An EMR of 1.0 is the industry average. If you have fewer claims than average, your EMR drops below 1.0 and you pay less; more claims push it above 1.0 and you pay more.
EMR calculation example for a $50,000 payroll at EMR 1.0:
- Base rate (clerical): $0.50 per $100 payroll
- ($50,000 ÷ 100) × $0.50 = $250 base premium
- $250 × 1.0 (EMR) = $250 final premium
- Payroll Taxes Guide
- Overtime Rules
- Tax Withholding Guide
Same payroll at EMR 1.5 (above average claims):
- $250 × 1.5 (EMR) = $375 final premium — 50% more expensive
At EMR 0.75 (better than average):
- $250 × 0.75 (EMR) = $187.50 final premium — 25% savings
EMR is calculated by your state's workers comp rating bureau (NCCI in most states) using 3 years of claims data, excluding the most recent policy year. It applies to businesses with $5,000 or more in premium and is recalculated annually. New businesses default to EMR 1.0.
How to Reduce Your Workers Comp Premium
- Implement a safety program — documented safety training, PPE requirements, and incident reporting reduce claims and lower your EMR over 3 years
- Return-to-work programs — light duty assignments for injured workers reduce claim costs, which directly lowers your EMR
- Audit your class codes — misclassified employees (e.g., office staff coded as field workers) overpay significantly. Review your payroll audit annually
- Pay-as-you-go programs — some insurers offer premiums based on actual payroll each period rather than estimated annual payroll, eliminating large audit adjustments
- Shop carriers — different insurers apply different state adjustment factors to the same base rates. Get 3+ quotes annually
For total employer payroll costs including FICA match, FUTA, and SUTA, see the Employer Tax Calculator. For employee take-home calculations, see the Payroll Tax Calculator.