How Workers' Comp Rates Are Determined
Workers' compensation insurance rates are not arbitrary — they are calculated using a systematic methodology that considers industry risk, employer size, and claims history. Understanding this formula helps employers manage costs and avoid overpaying for coverage.
The Premium Formula
The basic formula for calculating a workers' comp premium is:
Premium = (Payroll / $100) x Class Code Rate x Experience Modification Rate (EMR)
For example, if your annual payroll is $500,000, your class code rate is $2.50 per $100, and your EMR is 0.90, your premium would be:
($500,000 / $100) x $2.50 x 0.90 = $11,250
Classification Codes
Every business is assigned one or more classification codes (class codes) based on the type of work performed. These codes are developed by the National Council on Compensation Insurance (NCCI) or state-specific rating bureaus. Each code has a base rate that reflects the historical frequency and severity of injuries for that type of work. Higher-risk industries (roofing, logging, mining) have much higher rates than lower-risk industries (clerical office, software development).
Experience Modification Rate (EMR)
The EMR is a critical factor that can significantly raise or lower your premium. It compares your company's actual claims experience over the past three years (with a one-year lag) to the expected claims for businesses of similar size and industry. A company with fewer and less costly claims earns an EMR below 1.0, resulting in a premium discount. A company with more claims earns an EMR above 1.0, resulting in a surcharge.
The EMR is calculated using a formula that gives more weight to claim frequency (number of claims) than to claim severity (cost of individual claims). This means that multiple small claims can hurt your EMR more than a single large claim.
Workers' Comp Rates by State Comparison
Workers' comp rates vary significantly from state to state due to differences in benefit levels, medical costs, regulatory environments, and industry mix. The following table shows index rates for common class codes across major states.
| State | Rating Bureau | Avg. Rate per $100 | Clerical (8810) | Construction (5403) | Restaurant (9082) | Trend |
|---|---|---|---|---|---|---|
| California | WCIRB | $1.56 | $0.37 | $9.24 | $3.44 | Decreasing |
| New York | NYCIRB | $1.58 | $0.19 | $12.60 | $2.68 | Stable |
| Florida | NCCI | $1.10 | $0.16 | $5.84 | $2.12 | Decreasing |
| Texas | NCCI | $0.82 | $0.14 | $5.32 | $1.76 | Decreasing |
| Illinois | NCCI | $1.32 | $0.21 | $10.46 | $2.80 | Decreasing |
| Pennsylvania | PCRB | $1.48 | $0.22 | $9.86 | $3.08 | Stable |
| Ohio | BWC | $0.98 | $0.11 | $6.72 | $1.52 | Decreasing |
| New Jersey | NJCRIB | $1.64 | $0.20 | $11.22 | $2.90 | Stable |
| Georgia | NCCI | $0.92 | $0.15 | $6.18 | $1.84 | Decreasing |
| Virginia | NCCI | $0.62 | $0.12 | $4.76 | $1.26 | Stable |
| Michigan | DLEG | $1.08 | $0.17 | $7.96 | $2.24 | Decreasing |
| North Carolina | NCRB | $0.88 | $0.13 | $5.98 | $1.64 | Decreasing |
| Indiana | NCCI | $0.68 | $0.10 | $4.92 | $1.18 | Stable |
| Colorado | NCCI | $0.78 | $0.12 | $6.42 | $1.56 | Decreasing |
| Connecticut | NCCI | $1.72 | $0.24 | $12.18 | $3.22 | Stable |
| Alaska | NCCI | $2.08 | $0.32 | $14.86 | $4.12 | Stable |
Rate Disclaimer
These rates are approximate index rates for illustration purposes. Actual rates vary by insurer, specific sub-classification, territory within the state, and your company's EMR. Contact a licensed insurance agent for an accurate quote. Rates are generally trending downward nationally due to workplace safety improvements.
Common Classification Code Rates
Classification codes group businesses by type of work and assign risk-appropriate rates. Here are the most common class codes and their typical national average rates.
| Code | Description | National Avg. Rate | Risk Level |
|---|---|---|---|
| 8810 | Clerical Office | $0.16 | Very Low |
| 8742 | Outside Sales | $0.28 | Low |
| 8017 | Retail Stores | $0.92 | Low-Moderate |
| 9082 | Restaurant | $2.18 | Moderate |
| 8832 | Medical Doctor (Physician) | $0.34 | Low |
| 8829 | Nursing Home / Skilled Nursing | $3.86 | Moderate-High |
| 5190 | Electrical Wiring | $4.68 | Moderate-High |
| 5403 | Carpentry (Commercial) | $7.84 | High |
| 5551 | Roofing | $14.22 | Very High |
| 2702 | Logging | $18.76 | Very High |
| 7720 | Police Officers | $4.92 | Moderate-High |
| 7710 | Firefighters | $6.84 | High |
| 8380 | Automobile Service / Repair | $3.24 | Moderate |
| 3632 | Machine Shop | $3.46 | Moderate |
| 7380 | Drivers / Chauffeurs | $5.12 | Moderate-High |
Rates represent the cost per $100 of payroll. A rate of $2.18 means you pay $2.18 for every $100 of payroll in that classification. See our complete Class Codes Guide for a comprehensive lookup table.
How to Reduce Your Workers' Comp Rates
Employers can take several practical steps to lower their workers' comp premiums over time. The most effective approach combines workplace safety improvements with smart insurance management.
Workplace Safety Programs
The most effective long-term strategy for reducing workers' comp costs is preventing injuries. Companies with formal safety programs, safety committees, regular training, and job hazard analyses consistently achieve lower injury rates and better EMRs. Many states offer premium discounts of 5-15% for employers who implement certified safety programs.
Return-to-Work Programs
A structured return-to-work program that brings injured employees back to modified or light-duty work as soon as medically appropriate significantly reduces claim costs. This lowers both temporary disability payments and the total claim cost, which improves your EMR. Studies show that workers who return to some form of work within 30 days have dramatically better recovery outcomes than those who remain off work entirely.
Classification Code Audit
Ensure your employees are classified under the correct class codes. Misclassification into a higher-risk code results in overpaying premiums. For example, administrative employees should be classified under the lower-risk clerical code (8810) rather than under the employer's primary operating code. A workers' comp specialist can audit your classifications and identify potential savings.
Payroll Verification
Since premiums are based on payroll, ensure your payroll records accurately reflect the compensation types included in the premium calculation. Overtime premiums (the time-and-a-half premium above regular pay), tips, and certain fringe benefits may be excluded from the payroll calculation in some states. Verify that your insurer is calculating your premium on the correct payroll base.
Insurance Market Shopping
Workers' comp rates can vary significantly between insurers, especially for mid-size and large employers. Work with a broker who specializes in workers' comp to obtain competitive quotes from multiple carriers. Consider alternative risk management options such as:
- Higher deductible plans: Accept a deductible per claim in exchange for lower premiums
- Retrospective rating plans: Pay an adjustable premium based on actual losses
- Group self-insurance: Join with similar employers to self-insure as a group
- State fund options: Some states offer competitive state fund alternatives to private insurance
Related Calculators and Resources
Use our other free tools and guides to better understand your workers' compensation benefits:
Frequently Asked Questions
Answers to the most common questions about this topic.
Workers' comp insurance rates are determined by three primary factors: (1) Your business classification code, which represents the risk level of your industry; (2) Your payroll, since premiums are calculated per $100 of payroll; and (3) Your Experience Modification Rate (EMR or Mod), which reflects your company's claim history compared to similar businesses. The base rate is set by your state's rating bureau (such as NCCI) and adjusted by these factors to produce your final premium.
An Experience Modification Rate (EMR or Mod) is a number that compares your company's actual claims experience to the expected claims for businesses of your size and industry. An EMR of 1.0 means your claims are exactly average. An EMR below 1.0 (e.g., 0.85) means fewer claims than average, resulting in lower premiums. An EMR above 1.0 (e.g., 1.25) means more claims than average, resulting in higher premiums. Your EMR is typically calculated using 3 years of claims data with a 1-year lag.
States with historically higher workers' comp rates include California, New York, New Jersey, Connecticut, Alaska, and Illinois. These states tend to have higher medical costs, more generous benefit structures, or more complex regulatory environments. Conversely, states like Indiana, Arkansas, Virginia, and North Dakota tend to have lower average rates. However, rates vary significantly by industry classification within each state.
Workers' comp rates are typically reviewed and adjusted annually. The National Council on Compensation Insurance (NCCI) and state rating bureaus file proposed rate changes each year based on loss experience, medical cost trends, and other actuarial factors. Your individual premium also changes annually based on your updated payroll and EMR. Some states have seen significant rate reductions in recent years due to improved workplace safety and reforms.
The National Council on Compensation Insurance (NCCI) is a non-profit organization that collects workers' compensation data, develops classification codes, and calculates advisory loss costs and rates for most US states. NCCI provides the baseline rates that insurers use to price workers' comp policies. However, several states (California, New York, Pennsylvania, Michigan, and others) have their own independent rating bureaus. NCCI's analysis influences rates in the 36+ states where it operates.
Yes, there are several strategies to reduce your workers' comp rates: (1) Implement a strong workplace safety program to reduce injuries; (2) Establish a return-to-work program for injured employees; (3) Report and manage claims promptly to minimize costs; (4) Review your classification codes to ensure accuracy; (5) Consider a higher deductible or retrospective rating plan; (6) Audit your payroll records for accuracy; (7) Shop multiple insurers for competitive quotes; and (8) Work with a specialized workers' comp insurance broker.