Workers' Compensation
What Every Business Owner Should Know About Workers' Compensation in California
Published · Updated · by Palm Trinity Insurance
Workers' compensation is mandatory in California
Workers' compensation is a critical part of protecting both employees and businesses in California. For business owners, understanding the state's specific workers' compensation laws is essential to avoid legal issues and ensure employees are covered in the event of a workplace injury or illness. In California, workers' compensation is mandatory for any business with employees, and failing to comply can result in severe penalties.
California law requires every business with employees — full-time or part-time — to carry workers' compensation insurance. Even if you have just one employee, you are legally obligated to carry this coverage. Workers' compensation provides financial support to employees who are injured or fall ill due to their job, covering medical expenses, lost wages, and rehabilitation costs.
Failure to comply with California's workers' compensation laws can lead to steep penalties, including fines and even closure of your business. The state takes compliance seriously, and uninsured employers can be held personally liable for the medical and legal costs associated with an employee injury.
What workers' compensation covers
Workers' compensation insurance provides essential benefits to employees who are injured or become ill as a result of their job. In California, workers' compensation typically covers four categories.
Medical expenses — the cost of medical treatments, hospital stays, surgeries, and any necessary rehabilitation or physical therapy related to the workplace injury or illness.
Lost wages — if an employee is unable to work due to their injury, workers' compensation pays a portion of their lost wages while they recover.
Disability benefits — if the injury results in a temporary or permanent disability, compensation helps replace lost income on an ongoing basis.
Death benefits — in the unfortunate event of a work-related death, workers' compensation provides financial support to the deceased employee's dependents.
Industries like construction, manufacturing, restaurants, and apartment management see higher rates of workplace injuries than office-based businesses. Ensuring that your workers' compensation policy is comprehensive can help protect your business from costly lawsuits and provide protection to your employees.
How to obtain workers' compensation insurance in California
California businesses can acquire workers' compensation insurance through two main channels: private insurance carriers, or the State Compensation Insurance Fund (State Fund / SCIF), which is the insurer of last resort for businesses that can't get coverage in the private market.
Most businesses prefer the private market — private carriers can offer more competitive rates, especially for businesses with strong loss histories, and they generally provide more responsive claims handling and risk-control services. The State Fund is always available as a backstop and writes coverage for businesses that private carriers decline.
When choosing a policy, the right answer depends on your industry's class code, the size and composition of your payroll, your experience modification factor (X-Mod), and the loss history of your specific business. A specialist broker who understands the California workers' comp market can shop your placement across multiple carriers and recommend the right fit — not just the cheapest premium, but the right combination of premium, coverage, and claims service.
Workers' compensation and employee rights
California employees have specific legal rights when it comes to workers' compensation. If an employee is injured or becomes ill due to their job, they have the right to file a workers' compensation claim, and employers are prohibited from retaliating against them for doing so. Employees cannot be fired, demoted, or penalized in any way for seeking compensation.
Employees also have the right to medical treatment for their injuries and compensation for lost wages if they're unable to work. If the injury results in long-term or permanent disability, employees are entitled to disability benefits to help cover their lost income.
Employers are legally required to inform employees of their workers' compensation rights and provide guidance on how to file a claim. The state requires posting of a specific Notice to Employees of Workers' Compensation Rights in a visible location, and providing a claim form within one working day of being notified of an injury. Failure to do so can result in legal penalties and potential lawsuits.
Common mistakes California business owners make
Under-reporting payroll. Some businesses try to reduce their workers' compensation premiums by under-reporting payroll at policy binding. This always catches up to them at the year-end premium audit, when the carrier reconciles the actual payroll against the estimate. Under-reporting results in large audit bills, can damage the carrier relationship, and in egregious cases can trigger civil and criminal penalties.
Misclassifying employees. Misclassifying high-risk workers as independent contractors or assigning them to a lower-rated class code is another frequent mistake. Misclassification can lead to fines and uncovered claims if an injury occurs — and California is among the most aggressive states in the country at challenging worker classification.
Failing to update policies. As your business grows or changes, your workers' compensation needs evolve. Regularly reviewing and updating your policy ensures you're adequately covered as you add employees, change operations, or expand into new lines of work.
Delaying injury reporting. Employers who delay reporting workplace injuries to their carrier can face legal consequences and may lose claim defenses. Best practice is to report any incident the same day it occurs, even if you're not sure it will turn into a claim.
What's changing in California workers' comp
After 13 consecutive years of California workers' compensation rate decreases from 2015 through 2024, the cycle has reversed. WCIRB approved an 8.7% advisory pure premium increase effective September 1, 2025 and has filed for an additional 10.4% for September 1, 2026. Restaurants and other high-frequency-claim industries are seeing some of the largest impacts.
Additionally, the legacy single restaurant class code 9079 was eliminated by WCIRB effective September 1, 2024 and split into six new codes: 9058 (hotel food/beverage), 9080 (full-service restaurants), 9081 (restaurants N.O.C.), 9082 (caterers), 9083 (fast food / fast casual), and 9084 (bars and taverns). If your business is currently coded under 9079, you'll be reassigned to one of these six on your next renewal.
The right response to a hardening market isn't to accept the renewal increase as-is — it's to shop the placement aggressively, scrub your X-Mod for errors, audit your class code assignment, and make sure you're capturing every discount your loss control practices entitle you to.
Frequently asked
Related questions
Do I need workers' compensation insurance for one employee in California?
Yes. California requires workers' compensation coverage for any business with even a single employee, regardless of full-time or part-time status. The only exemptions are for sole proprietors with no employees and certain owner-operators in specific industries. Domestic employees working 52+ hours within 90 days of an injury also require coverage. Failing to carry workers' compensation when required can result in stop-work orders, fines of $1,500–$2,500 per employee per week, and personal liability for any employee injury that occurs without coverage.
What's an X-Mod and how does it affect my premium?
Your Experience Modification Factor (X-Mod or EMR) is a multiplier applied to your workers' compensation premium that reflects your claim history versus other businesses in your class code. An X-Mod of 1.00 means you're average. Below 1.00 means you have better-than-average claims history and your premium is reduced. Above 1.00 means worse-than-average and your premium is surcharged. A 3-year clean loss history typically produces a mod of 0.85–1.00, while a business with serious claims can carry 1.25–1.75. The mod is recalculated annually by WCIRB and applies for 3 years after each policy period.
Are independent contractors covered by my workers' compensation policy?
Generally no — independent contractors carry their own coverage, or if they're truly independent, no coverage at all. However, California uses the ABC test (codified in AB 5) to determine whether a worker is genuinely an independent contractor or actually an employee. If you're treating someone as a contractor who would fail the ABC test, you're exposed both for workers' compensation purposes and for wage-and-hour purposes. The safest practice is to verify that any 1099 worker carries their own workers' compensation insurance, or include them on your policy if the relationship is ambiguous.
What happens at the workers' comp premium audit?
Every California workers' comp policy is audited at expiration. The carrier sends an auditor (or runs a self-audit) to reconcile the payroll you estimated at binding with your actual payroll for the policy year. If you under-estimated, you owe additional premium — sometimes substantially. If you over-estimated, the carrier refunds the difference. The audit also verifies class code assignment based on actual job duties. Be ready with payroll records, 1099s, certificates of insurance from any subcontractors, and a breakdown of payroll by class code if you have multiple.
How do I report a workplace injury in California?
Report the injury to your workers' compensation carrier as soon as possible, ideally the same day. Provide the injured employee with a DWC-1 claim form within one working day of being notified of the injury. File the Employer's First Report of Occupational Injury (DLSR Form 5020) with your carrier within five days. Authorize medical treatment immediately — California has strict timelines for providing treatment, and delays can result in penalty payments to the injured worker on top of the underlying claim cost.
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