Short answer: It depends on your business, so there's no single price. California workers' comp premiums are generally calculated from your payroll, the classification codes for the work employees do, the insurer's rate for each class, and your experience modification (if you have one), plus discounts, credits and fees. Roofing typically costs far more than clerical work.
The basic formula
A simplified version of how premium is built:
(Payroll ÷ 100) × class rate × experience mod ± schedule credits or debits + fees and assessments = premium
- Payroll: estimated annual payroll for each class
- Class code: describes the type of work
- Rate: the insurer's rate per $100 of payroll for that class
- Experience mod: compares your claims history to similar businesses
- Credits and debits: insurer adjustments based on underwriting
- Assessments: state-mandated fees
Who sets the rates?
The Workers' Compensation Insurance Rating Bureau of California (WCIRB) maintains the classification system and recommends advisory pure premium rates for each class. Insurers file their own rates with the California Department of Insurance, so rates differ among insurers. The Insurance Commissioner reviews the advisory rates. See California Department of Insurance.
Why costs vary so much
- Type of work: construction, roofing, trucking and other physical jobs carry higher rates. See California contractors' workers' comp by trade.
- Payroll size: more payroll means more premium.
- Claims history: your experience mod can raise or lower premium. See what is an experience mod (EMR).
- Correct classification: misclassified employees can mean overpaying or a large audit bill.
- Safety programs and underwriting factors.
The premium audit
Premiums start as estimates. At the end of the policy period, the insurer audits your actual payroll and classifications. If payroll was higher than estimated, you owe more. If lower, you may get a refund. See what is a premium audit.
1099 workers and uninsured subcontractors
Uninsured subcontractors or misclassified "independent contractors" may be added to your payroll at audit. California uses the ABC test for many worker classification questions. See do I need workers' comp for 1099 contractors.
Owners and officers
Some owners and officers can elect to be excluded from coverage, depending on entity type and rules. See do I need workers' comp with no employees and who is exempt from workers' comp in California.
How to lower your cost legitimately
- Classify employees correctly, and split payroll among classes when the rules allow
- Keep records that support classifications at audit
- Collect certificates from subcontractors
- Invest in safety and return-to-work programs
- Report claims promptly to help control costs
- Shop through a broker to compare insurers' rates and credits
- Consider pay-as-you-go billing to match premium to actual payroll
Never underreport payroll or misclassify workers. It can lead to penalties, audit bills and fraud allegations.
Why we don't publish price estimates
Because premium depends on your payroll, class codes, insurer and claims history, any generic "average cost" can be misleading. A broker can quote real rates for your business.
What happens without coverage?
Operating without required workers' comp in California is illegal and can bring stop-work orders and penalties. See what happens if workers' comp lapses in California and how to get workers' comp for a high-risk business.
Common scenarios
A small office with clerical staff. Typically low rates per payroll dollar, so premium is driven mostly by payroll.
A roofing company. Among the higher rates because of fall risk. Roofers must carry workers' comp under CSLB rules even without employees.
A restaurant. Rates depend on the classes involved, and claims for burns, cuts and slips can affect the mod. See restaurant workers' comp insurance.
A growing startup. Premium rises as payroll grows. Update payroll estimates mid-term to avoid audit surprises.
Minimum premiums
Insurers often charge a minimum premium regardless of payroll, so very small policies may cost more than the formula suggests.
Contact Alishahi Insurance or call (877) 711-4545. See workers' compensation insurance.
Frequently asked questions
How much does workers' comp cost in California?
It varies by business. Premium is based on payroll, class codes, insurer rates, your experience mod and other factors.
How is workers' comp premium calculated?
Generally payroll divided by 100, times the class rate, times your experience mod, adjusted for credits, debits and fees.
What does the WCIRB do?
It maintains California's classification system and recommends advisory pure premium rates. Insurers file their own rates.
Why did I get a bill after my workers' comp audit?
Usually because actual payroll was higher than estimated, or employees or uninsured subcontractors were added or reclassified.
How can I lower my workers' comp premium?
Classify employees correctly, document payroll, collect subcontractor certificates, invest in safety and compare insurers through a broker.
Alishahi Insurance · 439 N Canon Dr, Penthouse, Beverly Hills, CA 90210 · (877) 711-4545 · CA License #4348151. General information only. This isn't legal, tax or financial advice or a coverage determination. Coverage depends on policy language and underwriting, and rules vary by state.