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.

Typical 2026 California rates

For policies renewing on or after September 1, 2026, California's approved advisory pure premium rates average $1.65 per $100 of payroll — a 10.4% increase driven by cumulative trauma claims and medical costs. That's the average across all classes: clerical classes run well under $1 per $100, while high-hazard construction classes (roofing, framing, excavation) can run into the double digits. Nationally, a small business's workers’ comp median is roughly $1,400/yr, but payroll size, class codes, and your X-Mod drive the real number.

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

What is the average workers' comp rate in California for 2026?

Approved advisory pure premium rates average $1.65 per $100 of payroll for policies renewing on or after September 1, 2026 — up 10.4%. Your class codes and X-Mod determine where you land relative to that average.

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.