Missouri Workers' Compensation Rates in 2017: Key Figures and Factors

2017 Premium Rates by Classification

In 2017 Missouri's workers' compensation premiums varied sharply across job classifications. The state's rating bureaus assigned a base rate for each class, then applied experience modifiers to calculate the final employer cost. For example, the construction class (code 5403) carried a base rate of $2.65 per $100 of payroll, while clerical office work (code 8810) was only $0.38 per $100.

Experience Rating and Modification

Employers with a history of low claim frequency received a discount factor, often between 0.70 and 0.90, whereas firms with frequent or severe claims faced modifiers above 1.10. The experience rating was computed using the formula prescribed by the Missouri Workers' Compensation Commission, which blends actual loss costs with a statewide loss index.

State Mandates Influencing 2017 Rates

Missouri law required all employers to carry coverage at the statutory minimum, but the state also imposed a 2.5% surcharge on employers who failed to meet safety‑training standards. Additionally, the 2017 legislation introduced a modest increase to the medical fee schedule, raising average medical claim costs by roughly 3%.

Comparison with Neighboring States

When stacked against Illinois and Kansas, Missouri's average rate for the high‑risk construction class was about 5% lower than Illinois but 8% higher than Kansas. The differences stem primarily from each state's loss‑cost methodology and the size of their rating bureaus.

Table: Selected 2017 Rates and Modifiers

Practical Takeaways for Employers

• Review your class code annually; misclassification can inflate premiums.
• Invest in safety programs to lower your experience modifier.
• Monitor the state's medical fee updates, as they directly affect claim costs.
• Compare your effective rate with industry benchmarks to spot pricing anomalies.