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Compliance
California Labor Code Workers' Comp Requirements Explained
California Labor Code Section 3700 requires nearly every employer in the state to carry Workers' Compensation insurance. This guide walks through who must comply, how the requirement applies across industries, and the penalties for non-compliance — including stop-work orders and criminal exposure.
Whether you employ a crew in Los Angeles, farm workers in the Central Valley, or office staff in San Francisco, the rule is statewide. Learn how to stay compliant and avoid the penalties that catch California employers off guard.
For coverage guidance, visit the California Workers' Comp page or the Sacramento Workers' Comp page for local service.
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Premium factors
How California X-Mods Affect Workers' Comp Premiums
Your experience modification factor — the X-Mod — is one of the most important numbers on a California Workers' Comp policy. It adjusts your premium up or down based on your claims history compared to other employers in the same classification.
This guide explains how the WCIRB calculates X-Mods, what counts as a claim, how small claims can still move your number, and what California employers can do to improve it over time. A lower X-Mod can meaningfully reduce your statewide premium.
See California Workers' Comp coverage for a quote conversation.
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Classifications
California Workers' Comp Class Codes by Industry
Workers' Comp class codes assign a base rate to each type of job duty. A roofer in Fresno, a warehouse worker in Oakland, and a clerical employee in San Diego all carry different codes — and those codes drive premium.
This statewide guide explains how the WCIRB class code system works, why accurate classification matters, and how misclassification can lead to audit surprises. We cover common California industries including construction, agriculture, manufacturing, and services.
For a class code review, visit the California Workers' Comp page or call 916-822-9595 — open 365 days a year, 8am to 9pm Pacific, including all major holidays.
Get California Workers' Comp guidance for your business or read about Sacramento Workers' Comp.