How Much Does Workers' Comp Insurance Cost?

Workers' comp premium isn't a flat price — it's built from your payroll, the rate for each job's class code, and your experience modifier (X-Mod). Here's exactly what moves the number and how to bring it down.

Short answer: Workers' comp is priced as (payroll ÷ 100) × the class-code rate, then multiplied by your X-Mod. A low-hazard clerical class might run a few dollars per $100 of payroll; a high-hazard class like roofing can run many times that. Your exact number depends on your classes, payroll, and loss history.

What determines your premium

  • Payroll by class — the base of the calculation (estimated up front, trued up at audit).
  • Class code rate — set by the work performed; clerical is cheap, roofing/framing/trucking are far higher.
  • X-Mod — rewards a clean claims history (below 1.00) or penalizes a poor one (above 1.00).
  • State — rates and rules differ; California is its own system.
  • Credits/debits, deductibles, and carrier appetite for your class.

How to lower it

  • Make sure each employee is in the correct class code (mis-classing into a high rate is common and costly).
  • Audit your X-Mod worksheet for errors; build a return-to-work program to cut claim severity.
  • Collect certificates from every subcontractor so uninsured subs aren't added to your payroll at audit.
  • Shop the account across carriers — rates for the same class vary widely.

Full details: workers' comp in California and the audit checklist.

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FAQ

How is workers' comp premium calculated?

Payroll divided by 100, times the rate for each class code, times your experience modifier (X-Mod), adjusted for credits, deductibles, and carrier factors.

Why is my roofer's workers' comp so expensive?

High-hazard classes like roofing carry much higher rates per $100 of payroll because of injury frequency and severity. Correct classification and a clean X-Mod are the main levers.

Can I lower my workers' comp cost mid-term?

Premium is trued up at audit to actual payroll, and your X-Mod and classifications can be corrected. Re-shopping at renewal is usually the biggest lever.

Educational information only; not a quote or coverage advice. Any figures are general industry ranges and your actual premium depends on your specific operation, location, payroll/revenue, loss history, limits, and carrier underwriting. Focus West Insurance Solutions, San Diego, CA (CA Lic. #0M32679). Related: WC overview · X-Mod explained · WC quick quote.