Home› Business & Marketing› HR & Payroll› Workers Comp Rate Calculator

🩹 Workers Comp Calculator

Estimate your annual workers' compensation insurance premium

Payroll & Business
$
Industry / Job Classification
Experience Modification Rate (EMR)
0.5 (excellent)1.0 (average)2.0 (poor)
State Factor
Annual Premium Estimate
$3,840/yr
Estimated annual workers' comp premium
$2,188
Base Premium
$3,840
Modified Premium
$768
Per Employee
$1.54
Eff. Rate/$100
$0
EMR Impact ($)
$320
Monthly Cost
Premium at Different EMR Levels
EMRDescriptionAnnual Premiumvs. Base
Premium Impact by EMR Level

What is the Experience Modification Rate (EMR)?

The EMR (also called the "experience mod" or "mod factor") is a multiplier applied to your workers' comp premium based on your company's actual claims history compared to others in your industry.

  • EMR = 1.00: Your claims exactly match the industry average
  • EMR < 1.00: Fewer claims than average — you get a discount
  • EMR > 1.00: More claims than average — you pay a surcharge
  • Calculation period: Your most recent 3 years of claims (excluding the current year)
  • Who calculates it: NCCI (National Council on Compensation Insurance) in most states

How to Lower Your EMR

  • Return-to-work program: Getting injured workers back to modified duty reduces claim severity dramatically
  • Safety training: OSHA-10/30 certification, regular safety meetings, documented safety policies
  • Claims management: Proactive communication with injured workers and adjusters speeds claim closure
  • Audit your payroll classification: Misclassified employees may inflate your base premium — review annually
  • Self-insurance/captives: Large companies may form captive insurance arrangements to gain more control
  • Pre-employment screening: Drug testing and background checks reduce certain claim types

State Fund vs Private Insurance

Most states allow private insurance carriers, but some states require purchasing from a state fund:

  • Competitive states: Most states — you can choose any licensed carrier
  • Monopolistic state funds: North Dakota, Ohio, Washington, Wyoming — must purchase from state
  • Self-insurance: Companies with $500K+ in payroll may qualify to self-insure in some states

State fund rates are typically non-negotiable, while private carriers may offer credits for safety programs and claims management.

How to Use This Calculator

1

Select Industry & Class Code

Choose your business type and NCCI class code to determine the base rate per $100 of payroll.

2

Enter Payroll Amount

Input your total annual payroll for each employee classification.

3

Calculate Premium

See the estimated annual premium, adjusted for your experience modification rate (EMR) and any credits or debits.

Formula & Methodology

Annual Premium

Premium = (Payroll / 100) × Base Rate × EMR

Base rate is per $100 of payroll, modified by your experience rating.

Experience Modifier

EMR = Actual Losses / Expected Losses

An EMR of 1.0 is average; below 1.0 earns discounts, above 1.0 increases premiums.

Cost Per Employee

Per Employee = Annual Premium / Number of Employees

Useful for budgeting the workers comp cost per headcount.

About this calculation · Accuracy & Methodology

Key Terms

Class Code
A 4-digit NCCI code categorizing job types by risk level (e.g., 8810 for clerical, 5403 for carpentry).
Experience Modification Rate
A multiplier reflecting your company's claim history vs. industry average — rewards safe workplaces.
Base Rate
The cost per $100 of payroll for a given class code, set by the state rating bureau.
Audit Premium
The final premium after year-end payroll audit adjusts the estimated premium to actual payroll figures.
Monopolistic State
States (OH, ND, WA, WY) where workers comp must be purchased from a state fund, not private insurers.

Real-World Examples

Example 1

Office Business

Class 8810 (Clerical), Payroll: $500,000, Rate: $0.25/$100, EMR: 0.90

Premium: ($500,000/100) × $0.25 × 0.90 = $1,125/year. ~$56 per employee (20 staff).

Example 2

Construction Company

Class 5403 (Carpentry), Payroll: $800,000, Rate: $12.50/$100, EMR: 1.15

Premium: ($800,000/100) × $12.50 × 1.15 = $115,000/year. ~$5,750 per worker (20 crew).

Workers Comp Rates by Industry

IndustryClass CodeRate per $100Premium on $500K Payroll
Office/Clerical8810$0.25$1,250
Restaurant9082$2.40$12,000
Landscaping0042$6.80$34,000
Roofing5551$18.00$90,000
Trucking7219$8.50$42,500

Managing Workers Compensation Costs

How Premiums Are Calculated

Workers comp premiums are driven by three factors: class code (industry risk), payroll volume, and experience modification rate. A roofing contractor pays 70× more per $100 of payroll than an office worker because the injury risk is dramatically higher. Your EMR — based on three years of claim history — can swing premiums 20-40% in either direction.

Lowering Your EMR

The single biggest lever for reducing premiums is improving workplace safety to lower your EMR below 1.0. Implement a formal safety program, provide proper training and PPE, investigate every incident (not just injuries), and return injured workers to light duty quickly. Companies with an EMR of 0.75 save 25% compared to the industry average.