If you employ even one person in California, you almost certainly need workers' compensation insurance. Not optional. Not 'recommended.' Required by law.
Most small business owners know that vaguely, but they don't know the rules, the costs, or what happens if they get it wrong. Let's go through it.
Who actually needs workers' comp in California
California's rule is broader than most states. Per the California Department of Industrial Relations, you need workers' comp insurance if you have at least one employee, with a few narrow exceptions.
Exceptions
- Sole proprietors with no employees (you can opt to cover yourself, but you're not required)
- Single-member LLCs with no other workers
- Some specific household employees who work very limited hours
Independent contractors are generally not employees, so they don't trigger the requirement. But California's classification rules are strict (look up AB5 if you're curious). Treating someone as a contractor when the state would classify them as an employee is a fast way to get a workers' comp claim and a Labor Commission letter.
What workers' comp covers
If an employee gets injured or sick because of their job, workers' comp pays for:
- Medical treatment, including hospital, prescriptions, physical therapy
- A portion of their lost wages while they can't work
- Permanent disability if they don't fully recover
- Vocational training if they need to switch jobs
- Death benefits to dependents in fatal cases
In return for those benefits, the injured employee generally cannot sue your business for the injury. That's the deal. Workers' comp is basically a no-fault trade: they get covered quickly, you don't get sued.
What it doesn't cover
- Injuries that happen off the job
- Self-inflicted injuries
- Injuries from fights the employee started
- Injuries during a commute (with limited exceptions)
- Injuries while intoxicated on the job
What happens if you don't have it
Operating in California without workers' comp when you're required to have it is a misdemeanor. Penalties stack up fast:
- Up to $10,000 fine per uninsured employee
- Stop-work orders that shut your business down until you get coverage
- If an employee gets hurt while you're uninsured, you pay all medical bills and lost wages out of pocket. Personally.
- California's Uninsured Employers Benefits Trust Fund pays the worker, then comes after you to recover the money
- Possible jail time in egregious cases
This is not a corner you cut to save money. The cost of even one serious uninsured claim can end a small business.
How much does workers' comp cost?
Premiums are based on a few factors:
- Your industry classification code (a roofer's rate is much higher than an accountant's)
- Total payroll
- Your claims history (the experience modifier)
- How carefully your industry is currently being underwritten
Rates are usually quoted per $100 of payroll. For example, low-risk office work might be $0.50 per $100 of payroll, while construction trades can run $5 to $15 per $100 of payroll.
Translation: $50,000 of office payroll might cost $250 a year. $50,000 of roofing payroll might cost $5,000 a year. The variability is enormous.
How to get it
In California, you have two paths:
1. Private insurance carrier
Most businesses get workers' comp through a private insurance carrier, often through an independent agent who can shop multiple companies. This is usually the simplest and most flexible option.
2. State Compensation Insurance Fund (State Fund)
If you can't find coverage in the private market (often because of high-risk industry or a bad claims history), the State Fund is the insurer of last resort and is required to issue you a policy.
Most healthy small businesses don't need the State Fund. A local agent can usually find better rates in the private market.
How to keep your premium under control
1. Classify employees correctly
Each job role has a class code. A general office employee classified as a construction worker will spike your premium. Make sure each role is coded correctly. An audit at the end of your policy year will catch this either way, but it's better to have it right from the start.
2. Build a safety program
California offers premium discounts for documented safety programs. Even informal ones (regular safety meetings, written procedures, training records) help. They also reduce claim frequency, which is what really moves your experience modifier.
3. Get hurt employees back to work quickly
The single biggest claim cost is lost wages. If you can offer modified duty so an injured worker can come back part-time or in a different role, you cut claim costs significantly. That improves your experience mod and lowers next year's premium.
4. Audit your payroll annually
Workers' comp premiums are estimated up front based on projected payroll, then audited at year-end based on actual payroll. If you're projecting accurately, you avoid surprise audit bills (or refunds, but bills are more common).
Common small business mistakes
Misclassifying employees as contractors
California's strict ABC test makes most workers employees by default. If you can't pass all three parts of the test, the worker is an employee. Treating someone as a contractor doesn't get you out of workers' comp obligations.
Not covering family members or partners
Adult children and spouses working in the business are generally employees who need to be covered, even if they're not on payroll formally.
Letting coverage lapse for even a day
If a worker gets hurt during a one-day gap, you're personally on the hook. Set up auto-pay or work with an agent who tracks renewals proactively.
What to do if an employee gets hurt
- Get them medical care first. Time matters.
- Report the claim to your insurer within the time limit (varies, but sooner is always better).
- File a Form 5020 (Employer's Report of Occupational Injury or Illness) within 5 days for any injury serious enough to involve more than first aid.
- Document everything. Photos, witness statements, timeline. Memory fades fast.
- Cooperate with the insurer's adjuster. They handle the rest.
Bottom line
Workers' comp is mandatory, expensive in some industries, and unforgiving when you get it wrong. But it's also straightforward once you understand the rules.
If you're not sure whether you have the right classification codes, the right coverage, or whether your premium is competitive, get a second opinion. We do free reviews for California small businesses, and we routinely find businesses paying 20% to 40% more than they need to. No obligation.
Written by
ACIAI Team
Licensed California Insurance Agents
The ACIAI editorial team — a group of licensed California agents helping families navigate auto, home, life, and business insurance across the Central Coast.