Workers' compensation insurance is the policy that funds California's mandatory workers' comp benefits, and the state's rules are distinctive: coverage is required for any employer with employees, the State Compensation Insurance Fund (SCIF) guarantees availability, and benefits are generous and uncapped on the medical side. This standalone guide covers the national policy structure and then makes California law the spine, framed around the insurance contract you'll actually place.

The national base: the workers' comp policy

The standard workers' compensation and employers' liability policy has two main insuring agreements:

• Part One — Workers' Compensation. The insurer pays all statutory benefits the law requires—there are no policy limits on Part One because benefits are set by statute.
• Part Two — Employers' Liability. Covers the employer against lawsuits for work-related injury that fall outside the statutory system (e.g., third-party-over actions). Part Two has limits.
• Part Three — Other States Insurance can extend coverage to operations in additional listed states.

Workers' comp is a no-fault, exclusive-remedy system: benefits are paid without proving employer negligence, and in return the employee generally cannot sue the employer.

California mandate and how to comply

California requires every employer with one or more employees to carry workers' compensation insurance—there is no headcount exemption. Compliance options:

• A policy from an admitted insurer,
• A policy from SCIF, or
• Approved self-insurance with posted security.

Operating without coverage is illegal and triggers stop-work orders, fines, and personal exposure for an injured worker's losses, plus loss of the exclusive-remedy shield.

SCIF: guaranteed availability

The State Compensation Insurance Fund (SCIF) both competes in the voluntary market and acts as the insurer of last resort, ensuring any California employer can obtain coverage. When a question asks how a high-risk California employer that can't find a carrier still complies, the answer is SCIF.

What the policy pays for the injured worker

The statutory benefit categories funded by the policy are:

• Medical care — reasonable/necessary treatment with no dollar cap and no employee deductible, frequently delivered through a Medical Provider Network (MPN).
• Temporary disability (TD) — wage replacement at about two-thirds of average weekly wages, subject to statutory min/max amounts that change annually.
• Permanent disability (PD) — for lasting impairment, rated by percentage.
• Supplemental Job Displacement Benefit — a retraining voucher when the worker doesn't return to the same employer.
• Death benefits — payments to dependents plus a burial allowance.

Pricing the policy: WCIRB, mods, and rating

California workers' comp pricing has its own machinery:

• The Workers' Compensation Insurance Rating Bureau (WCIRB) classifies employers and files advisory pure premium rates with the Commissioner.
• Premium is built on payroll (per $100 of payroll) by classification code, then adjusted by the employer's experience modification (mod) factor—rewarding good loss history and surcharging poor history.
• Unlike most P&C lines, comp rates are not under Prop 103 prior approval; California uses an open/competitive rating framework with WCIRB advisory rates and Commissioner oversight.

Who is covered and who can be excluded

• Employees (including most part-time/seasonal) must be covered.
• Sole proprietors and partners are generally exempt but may elect coverage.
• Qualifying corporate officers/directors and some LLC managing members may opt out with a signed waiver.
• Independent contractors are not employees, but California's strict ABC test governs the distinction and misclassification is heavily penalized.

Administration and disputes

Benefits and disputes are administered by the Division of Workers' Compensation (DWC), with contested claims heard by the Workers' Compensation Appeals Board (WCAB). The CDI licenses the insurers and oversees solvency, but the comp claims system runs through the DWC/WCAB.

Key California numbers to memorize

Common exam traps

• Assuming a small-employer exemption. Coverage is required for even one employee.
• Putting limits on Part One. Statutory benefits have no policy limit; Part Two is the part with limits.
• Naming the wrong residual market. It is SCIF.
• Capping medical care. California medical benefits are uncapped with no employee deductible.
• Treating TD figures as fixed. Min/max amounts change every year.
• Applying Prop 103 to comp rates. Comp uses WCIRB-advised open rating.
• Misclassifying contractors. The strict ABC test controls and misclassification is penalized.

Quick recap

California workers' compensation insurance funds a mandatory, no-fault, exclusive-remedy system that every employer with at least one employee must carry—via an admitted insurer, SCIF (the insurer of last resort), or approved self-insurance. The policy's Part One pays uncapped statutory benefits (medical with no dollar cap, TD at ~two-thirds of wages, PD, the Supplemental Job Displacement voucher, and death benefits), while Part Two (employers' liability) carries limits. Premium is payroll-based by class code and experience mod, priced under a WCIRB-advised open-rating system rather than Prop 103 prior approval. Sole proprietors/partners are exempt unless they elect in, qualifying officers may opt out, and the DWC/WCAB administers claims. Lock in the mandate, SCIF, the two policy parts, and the benefit list, and the comp-insurance questions are routine.