Workers' Compensation Insurance
Workers' compensation is the oldest mandatory commercial coverage in California and the one most likely to expose an employer to criminal as well as civil consequences if it is missing. This chapter walks you through the no-fault bargain at the heart of the system, who must be insured under Labor Code §3700, how the standard policy is built around Part One and Part Two, what benefits an injured worker actually receives, and how claims, classifications, and premium are handled in California. About 7% of the exam asks about this material, so understanding the structure here will pay back several questions.
The No-Fault Statutory Bargain
Workers' compensation is a no-fault, statutory exclusive-remedy system. The injured employee does not have to prove the employer was negligent and the employer cannot defend the claim by arguing the employee was careless. In exchange for that automatic, predictable set of benefits, the employee gives up the right to sue the employer in tort for the work-related injury. The system was created to replace the slow, expensive, and uncertain civil litigation that used to follow every workplace injury. The 'grand bargain' is a trade: the employee trades the chance of a large tort verdict for the certainty of medical care and partial wage replacement, while the employer trades unpredictable jury exposure for predictable insurance costs.
Who Must Carry Coverage — Labor Code §3700
California is the strictest state in the nation on workers' compensation coverage. Labor Code §3700 requires every employer that has even one employee to either purchase a workers' compensation policy from an admitted insurer or obtain state approval to self-insure. There is no headcount, industry, or payroll exemption. A failure to carry coverage is a misdemeanor under §3700.5, and the Division of Labor Standards Enforcement may issue a §3722 stop-order shutting the business down until coverage is in place and assess civil penalties (commonly $1,500 per employee under the stop-order, with statutory minimums). Beyond the fines, the uninsured employer remains personally liable for every dollar of an injured worker's benefits, and the worker can sue the employer in civil court without the usual workers' compensation defenses.
The Standard Policy — Part One and Part Two
The Workers' Compensation and Employers Liability policy used in California has two distinct coverage parts. Part One — Workers' Compensation pays the statutory benefits the injured worker is entitled to under the Labor Code. Because the insurer's obligation is to pay whatever the state requires, Part One has no dollar limit. Part Two — Employers Liability is true liability insurance that responds when an employee or family member sues the employer for an injury that falls outside the WC system. Classic Part Two scenarios include 'dual-capacity' suits (where the employer also happens to be the maker of the product that hurt the worker), consequential bodily injury to a spouse or child, third-party-over actions (a third party that paid a worker now seeks indemnity from the employer), and loss-of-consortium suits by a spouse. Part Two carries three separate limits — bodily injury by accident (each accident), bodily injury by disease (policy aggregate), and bodily injury by disease (each employee) — and the California minimum customarily written is $1,000,000 / $1,000,000 / $1,000,000.
Benefits Provided to the Injured Worker
California workers' compensation pays a specific menu of statutory benefits. Medical treatment is provided for the work injury without dollar limit, although treatment of chiropractic, physical therapy, and acupuncture visits is generally capped at 24 visits each per injury. Temporary Disability (TD) replaces lost wages while the worker recovers and cannot work, paid at two-thirds of average weekly wage, subject to statutory minimum and maximum amounts that are adjusted each year. Permanent Disability (PD) is paid when a doctor finds the worker has permanent impairment after reaching maximal medical improvement; the impairment percentage from the Permanent Disability Rating Schedule, adjusted for age and occupation, drives the weeks and the dollar amount. A Supplemental Job Displacement Benefit (SJDB) voucher (currently up to $6,000) goes to workers whose employer cannot offer regular, modified, or alternative work, and pays for retraining, books, tools, and certifications. Death benefits provide a burial allowance plus continuing weekly payments to dependents, with the total amount depending on the number of total and partial dependents.
Employee vs. Independent Contractor — the ABC Test
Only employees are entitled to workers' compensation, so the line between employee and independent contractor matters a great deal. Since AB 5 in 2019, California uses the ABC test codified at Labor Code §2775. A worker is presumed to be an employee unless the hiring business proves ALL THREE prongs: (A) the worker is free from the control and direction of the hirer in performing the work, (B) the work is performed outside the usual course of the hirer's business, and (C) the worker is customarily engaged in an independently established trade, occupation, or business of the same nature. Misclassifying a worker does not avoid the WC obligation — if the worker is really an employee under the ABC test, the WC insurer will cover the claim and the employer will face audit premium adjustments and potential penalties. A separate California rule, Labor Code §2750.5, presumes that any unlicensed person performing work that requires a contractor's license is the employee of the hiring contractor, regardless of how the parties labeled the relationship.
Owner and Officer Exemptions
Not every person at a business is automatically an 'employee' for WC purposes. A sole proprietor working in their own business is generally not their own employee and is not required to cover themselves. Active general partners may similarly opt out. For a corporation, Labor Code §3351 and §3352 allow a corporate officer who owns a sufficient percentage of the company — including a sole shareholder who also serves as an officer — to sign a written waiver and exclude themselves from coverage. The waiver must be in writing and filed with the insurer. Regular employees of the partnership, LLC, or corporation must still be covered. These exemptions only excuse the owner from being covered as a worker; they never excuse the business from covering its non-owner employees.
Claims, Investigation, and Deadlines
The claim process is built around a few hard deadlines. When an employer learns of a work injury, Labor Code §5401 gives the employer one working day to provide the injured worker with a DWC-1 claim form. Once the completed claim form is filed with the employer, Labor Code §5402 requires the insurer to investigate and either accept or deny the claim within 90 days. If the claim is not denied within that 90-day window, the injury is presumed compensable, and that presumption can be rebutten only with evidence that could not have been discovered with reasonable diligence within those 90 days. While the investigation is in progress, the insurer must authorize medical treatment up to $10,000. Disputes between the worker, the employer, and the insurer are adjudicated by the Division of Workers' Compensation (DWC) and its administrative law judges, not by the civil courts. If the WC insurer pays out benefits because of an injury caused by an unrelated third party (for example, a delivery driver who runs a red light), Labor Code §3852 lets the insurer subrogate against that third party to recover what it paid.
Premium, Classification, X-Mod, and the Uninsured Employers Fund
Workers' compensation premium starts with class codes assigned by the Workers' Compensation Insurance Rating Bureau (WCIRB) to reflect the kind of work an employee actually performs — a roofer's code carries a much higher rate than a clerical worker's. Each class code has a base rate per $100 of payroll. The employer's payroll by class is multiplied by the rate, and the result is modified by the Experience Modification Factor (X-Mod). The WCIRB calculates the X-Mod by comparing an employer's actual losses over a recent multi-year window with the average expected losses for businesses of the same class codes and size: an X-Mod of 1.00 is average, below 1.00 lowers premium (good loss history), and above 1.00 raises premium (worse-than-average loss history). When an employer breaks the law and operates without coverage, an injured worker is not left without recourse: the Uninsured Employers Benefits Trust Fund (UEBTF), set up under Labor Code §3716 and administered by the DWC, pays the workers' compensation benefits and then pursues the uninsured employer to recover what it paid.
Last updated: May 2026