Workers compensation through a PEO

How workers comp works inside a PEO

Standalone workers comp policies are individually underwritten: your insurance broker quotes carriers, who underwrite your specific business based on class codes, payroll volume, and three years of experience modifier history. PEOs work differently:

• The PEO holds a master workers compensation policy with one or more carriers, often a national pool covering thousands of clients.
• When you sign on as a co-employer, your employees become covered under the master policy — not a new standalone policy.
• Your business is rated and placed within the pool based on class codes, payroll, claims history, and the PEO's underwriting standards.
• Claims are managed by the PEO's claims team (or their carrier's adjusters), with the PEO acting as your interface.
• Payroll-based premium is collected on each payroll run, automatically — no annual lump-sum bill, no audit reconciliation surprise (though there is an annual audit).

The three handling models

Not every PEO handles your existing experience modifier the same way:

The right model depends on your mod. If you don't know yours, your current insurance broker can pull it from NCCI (or your state's rating bureau). Don't sign a PEO contract without knowing this number.

Class codes — why they matter and where PEOs go wrong

Every worker is assigned a workers compensation class code based on what they actually do. Class codes carry vastly different rates: a clerical employee in NCCI 8810 might cost 0.30 per $100 of payroll, while a roofer in NCCI 5551 might cost $20+ per $100 of payroll. Same business, same payroll dollars, 60x different premium.

PEOs make class-code mistakes for three common reasons:

• Defaulting to the highest code in scope. A multi-trade business gets coded entirely under the highest-rate code instead of splitting between codes based on actual time spent. Costly.
• Misclassifying field-supervisor or owner-on-job hours. Owners and supervisors who spend most of their time in trucks or office may qualify for office or executive codes — but only with proper documentation.
• Not requesting code splits when justified. An HVAC business with separate installer and service-tech workforces may have legitimately different rate codes. Many PEOs don't ask.

If your quote feels surprisingly high, ask for the class-code breakdown and benchmark against your current standalone classification. Differences here are often where the real money lives.

Common claim patterns by industry

The claim types that weight your experience modifier most heavily for service trades:

Claims management — often more valuable than the rate

Single workers comp claim handling is the unsung hero of the PEO comp relationship. A single bad claim — handled poorly — can spike your experience mod for three full years and cost tens of thousands in increased premium even after the claim closes.

Most PEOs include:

• 24/7 claims reporting hotlines with same-day adjuster assignment.
• Return-to-work programs — modified-duty placement to reduce indemnity (lost-time) costs, which weigh heaviest on the mod calculation.
• Medical provider networks — preferred providers with PEO-negotiated rates and better adherence to evidence-based treatment.
• Litigation defense — when claims escalate to disputes, the PEO's legal infrastructure handles it.
• Reserve management — pressure on adjusters to set reserves accurately rather than over-reserving, which inflates your mod.

For trades, this infrastructure is often valued at $5,000–$20,000 per claim in long-term mod impact.

OSHA, safety programs, and prevention

Most PEOs offer some form of safety support:

• Safety program templates — written safety manual customized to your industry and states of operation.
• OSHA recordkeeping support — 300/300A logs, recordable-incident reporting, OSHA poster compliance.
• Safety training content — for jobsite safety, fall protection, electrical safety, lock-out/tag-out, etc.
• On-site safety consulting — for larger accounts, periodic walk-throughs by the PEO's safety team or carrier loss-control rep.
• Drug-testing program coordination — pre-employment, post-accident, random testing.

Quality varies widely. Smaller PEOs may outsource safety support; larger PEOs may have in-house safety teams. For high-risk trades, ask specifically what's included before signing.

The annual audit — what to expect

Once a year (usually within 90 days of policy anniversary), the PEO's workers comp carrier runs an audit comparing estimated payroll to actual payroll. Three outcomes:

• Actual payroll matches estimated — no adjustment, you continue at the same rate.
• Actual payroll exceeds estimated — you owe the difference (an "audit additional premium").
• Actual payroll fell short of estimated — you may receive a credit or refund.

Because PEOs collect comp premium per payroll run, audit surprises are usually small. The exception: significant class-code shifts during the policy year (you started doing more roofing work mid-year) can cause re-rating.

Industry-specific considerations

• HVAC, plumbing, electrical — moderate-to-high rates, NCCI codes in the 5183–5190 range typically. Pool placement often favorable for clean-mod accounts.
• Roofing, framing, scaffolding — among the highest rates. Many PEOs decline roofing accounts entirely; specialists matter here. Mod handling is critical because single claims cause large mod swings.
• Landscaping, lawn care, tree service — high rates for tree work specifically (NCCI 0106 is one of the highest in the manual). Crew composition documentation matters.
• Restoration (water, fire, mold) — moderate rates, but biohazard work may complicate placement. Documentation of subcontracted vs. employee work matters.
• Janitorial, cleaning — low-to-moderate rates. Many PEOs handle this well.
• General office, professional services — low rates, PEO comp benefit is modest. Decision usually rests on benefits/admin rather than comp.

If your industry has unique exposure patterns, the PEO's prior experience in your vertical materially affects pricing and claim outcomes.

What we don't promise

We never tell you a PEO will lower your workers comp. Pricing depends on factors a buyer-side advisor cannot control — your mod, claims history, state, class codes, carrier appetites, and the PEO's underwriting standards. What we do promise: an honest comparison of what each PEO would actually quote your business, side by side, with the handling model spelled out.

Industry-specific takes

Comp is the line item where industry matters most — class codes, claim patterns, and mod handling all differ. The industry-specific takes:

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