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Workers’ Compensation Insurance Requirements in Missouri
Missouri drops the threshold to just 1 employee for construction contractors, versus 5 for other industries — Trade Safe helps roofers, electricians, and plumbers get compliant from day one.
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Workers’ Compensation Insurance Requirements in Missouri
Missouri carves out a special, stricter rule for the construction industry: while most employers only need coverage at 5 or more employees, construction employers must carry workers’ comp starting with their very first hire. That makes Missouri one of the states where trade contractors face a materially lower compliance bar than other local businesses.
Missouri Workers’ Compensation Legal Requirements
General Missouri employers must carry workers’ compensation once they reach 5 or more employees, but construction industry employers are required to have coverage with just 1 or more employees — a distinction that directly affects every roofing, electrical, and plumbing contractor in the state.
- General industry threshold: 5 or more employees
- Construction industry threshold: just 1 employee — no 5-employee grace period for trade contractors
- Sole proprietors and partners aren’t automatically covered but may elect coverage for themselves
- Knowingly operating without required coverage is a class A misdemeanor with penalties up to 3x the annual premium or $50,000 (whichever is greater); a second violation is a class E felony
How Missouri’s Workers’ Comp System Works
System type: Private Carrier Market
Missouri is a private-carrier state, with contractors purchasing coverage through licensed insurers. Per the Oregon DCBS 2024 study, Missouri ranks 16th of 51 states overall, with an index rate at 120% of the national median — putting it among the higher-cost states, and roofing in particular ranks 8th-highest nationally.
How Missouri’s Rates Compare by Trade
| Trade (NCCI Class Code) | National Rank (of 51) | Rate per $100 of Payroll |
|---|---|---|
| Roofing (Class 5551) | 8th of 51 | $15.16 |
| Electrical Wiring (Class 5190) | 21st of 51 | $2.56 |
| Plumbing NOC (Class 5183) | 12th of 51 | $3.33 |
Source: Oregon Dept. of Consumer and Business Services, 2024 Workers’ Compensation Premium Rate Ranking Study (published June 2025) — the only study benchmarking all 50 states plus DC on a common industry mix.
Filing a Workers’ Comp Claim in Missouri
Employees must report a work injury to their employer within 30 days, and the employer must report it to the Missouri Division of Workers’ Compensation. Disputes are resolved through the Division’s administrative law judges, with mediation available before a formal hearing.
Penalties for Non-Compliance
Missouri treats a first knowing violation as a class A misdemeanor carrying penalties up to three times the annual premium or $50,000, whichever is greater; a subsequent violation escalates to a class E felony (RSMo Chapter 287).
Resources: Missouri DOLIR — Workers’ Compensation Insurance, Missouri DOLIR — Requirements for the Construction Industry (PDF), Missouri DOLIR — When an Employer Doesn’t Have Coverage
How Much Does Workers’ Comp Insurance Cost in Missouri?
Missouri runs well above the national median overall, and roofing in particular is one of the most expensive trades to insure in the country per this study.
| Trade | Estimated Cost per $100 Payroll | What Drives It |
|---|---|---|
| Roofing | $15.16 (per the Oregon study’s Class 5551 rate) | 8th-highest roofing rate nationally — fall risk plus Missouri’s elevated overall cost index |
| Electrical | $2.56 (per the Oregon study’s Class 5190 rate) | Close to the national median for electrical risk |
| Plumbing | $3.33 (per the Oregon study’s Class 5183 rate) | Above-average plumbing rate, ranking 12th-highest nationally |
What Moves the Price Up or Down
- Missouri’s 120%-of-median overall index makes it one of the pricier states for trade contractor coverage
- The construction-specific 1-employee threshold means new contractors need to budget for coverage sooner than in most states
- Roofing carries an outsized premium in Missouri specifically, worth factoring into project bids
- Experience modification factor from claims history remains the biggest lever on your final premium
Rates above are drawn from the Oregon DCBS 2024 Workers’ Compensation Premium Rate Ranking Study and represent national benchmark class-code rates, not a guaranteed quote. Your actual premium depends on your experience modification factor, claims history, and payroll — get a personalized Trade Safe quote for exact pricing.
Frequently Asked Questions
How many employees before a Missouri contractor needs workers’ comp?
Just 1 — construction industry employers must carry coverage starting with their first employee, unlike the 5-employee threshold for most other industries.
Why does Missouri treat construction differently?
The state specifically lowered the threshold for construction due to the industry’s higher injury rates, requiring coverage from the first hire rather than the general 5-employee mark.
What’s the penalty for a Missouri contractor operating without coverage?
A knowing first violation is a class A misdemeanor with penalties up to 3x the annual premium or $50,000, whichever is greater; repeat violations become a class E felony.
Do Missouri sole proprietors have to cover themselves?
No, sole proprietors and partners aren’t automatically covered, though they can elect coverage — but any employee they hire in construction triggers the mandatory 1-employee rule.
Workers’ compensation requirements and penalties can change; always verify current rules with the Missouri Division of Workers’ Compensation.
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