Workers' Comp Insurance for Small Business: A Plain-English Guide (California and Illinois)

Short answer: if your small business has even one employee in California or Illinois, you need workers' compensation insurance. It pays for an injured employee's medical care and lost wages, and it protects you from most injury lawsuits by your own staff. Your premium is based on your payroll and the type of work your people do, so a five-person office pays far less than a five-person roofing crew.

We've placed workers' comp for small businesses since 1981, from home care agencies to offices and contractors. This guide covers what you need to know before you buy, in the order most owners ask.

Key takeaways

• California and Illinois both require workers' comp from your first employee, including part-time staff.
• A policy covers medical bills, a portion of lost wages, disability benefits and your liability if an employee sues over a work injury.
• Cost = (payroll ÷ 100) × your class code rate × your experience mod, plus insurer adjustments.
• To get a quote, have your payroll by job type, employee count and any prior claims history ready.
• Pay-as-you-go billing can replace a large upfront deposit with payments tied to each payroll.

Does my small business need workers' comp?

In both states, yes, as soon as you hire. California Labor Code section 3700 requires every employer with employees to carry coverage. Illinois requires it with even one part-time employee. Going without can bring stop orders that shut your business down, fines that start at $10,000, and personal responsibility for an injured worker's bills.

A few situations work differently:

• No employees: owners usually aren't required to cover themselves. See our guide to workers' comp for sole proprietors and the self-employed.
• 1099 workers: the state may consider them employees anyway. See our guide to workers' comp for independent contractors and 1099 workers.
• Owners and officers: in some cases they can exclude themselves in writing, but never their employees.

What workers' comp covers

A standard policy has two parts.

Part One: workers' compensation benefits

• Medical care for a work-related injury or illness, with no deductible for the employee
• Temporary disability payments that replace part of the employee's wages while they recover
• Permanent disability benefits if the injury causes lasting impairment
• Death benefits for dependents if a work injury is fatal

Part Two: employer's liability

Covers your defense and damages if an injury leads to a lawsuit that workers' comp benefits don't resolve, such as a claim from an employee's spouse. Most small businesses carry limits of $1 million or less, and some contracts require a specific minimum.

How much workers' comp costs for a small business

Premium is priced per $100 of payroll, so the two biggest drivers are how much you pay your people and what they do. Every type of job has a class code with its own rate. In California, the statewide average advisory rate for 2026 is $1.65 per $100 of payroll, but office staff cost a fraction of that and roofers cost many times more. In Illinois, insurers set their own rates on top of benchmarks that dipped slightly for 2026.

Three other factors move the number:

• Experience mod: once you're large enough, your own claims history raises or lowers your rate.
• Carrier: each insurer adds its own expenses and discounts, so quotes for the same business can vary widely.
• Accuracy: payroll in the wrong class code is the most common reason small businesses overpay.

Our guide to how much workers' comp insurance costs walks through the math with examples, and our California class code search helps you find the right class for each job.

Where small businesses buy workers' comp

• An independent agency like Bliss Marc compares several carriers, gets your class codes right, and helps when there's a claim or an audit.
• Direct carriers and online platforms sell their own policy. That can be quick, but you only see one company's price and appetite.
• California State Compensation Insurance Fund is a state-created insurer that competes with private carriers and writes many small employers.
• Illinois' assigned risk market, administered by NCCI, is the safety net for businesses that private carriers won't write. Pricing there is usually higher, so it's worth trying the voluntary market first.

What you need to get a quote

1. Your business name, address, entity type and FEIN
2. What your business does, in plain words
3. Estimated annual payroll, split by job type (for example office staff versus field staff)
4. Number of full-time and part-time employees
5. Any prior workers' comp policies and loss runs (claims history) for the last three to five years
6. Whether you use subcontractors, and whether they carry their own coverage

With that information, our online estimator can give you an instant premium range, and a licensed agent finishes the quote.

Ways to pay

Traditional policies usually require a deposit up front, followed by installments based on your estimated payroll. Pay-as-you-go billing calculates your premium from each actual payroll instead, which helps growing and seasonal businesses avoid large deposits and big audit bills. We cover it in detail in our guide to pay-as-you-go workers' comp.

Your responsibilities after you buy

• Post the required notices at each work site. Both states require a workers' comp notice to employees.
• Report injuries quickly. In California, you must give an injured employee a claim form (DWC-1) within one working day of learning about the injury. In Illinois, employees generally must notify you within 45 days, and you should notify your insurer right away.
• Keep payroll records by job type. Your insurer audits your actual payroll after the policy year and adjusts the premium. Our guide to preparing for a workers' comp audit shows what to keep.
• Collect certificates of insurance from every subcontractor, or their payroll may be added to your policy.

For state-specific details, see our California workers' compensation and Illinois workers' compensation pages. Home care agencies should start with our home health and home care agency insurance page.

Get a workers' comp estimate in two minutes

Our online estimator gives California and Illinois small businesses an instant workers' comp premium range by class code, and a licensed agent follows up to finalize coverage.

Get your instant workers' comp estimate or call us at 847-767-4504.

Frequently asked questions

How much is workers' comp for a small business?

It depends on your payroll and the work your employees do. Office-based businesses often pay a few hundred dollars a year, while construction and caregiving businesses pay much more per employee. The fastest way to know is a quote based on your actual payroll and class codes.

Do I need workers' comp if I only have part-time employees?

Yes. Both California and Illinois require coverage for part-time employees, starting with the first one.

Can I buy workers' comp for just a few months?

Policies are generally written for a year, but you can cancel when you no longer have employees. Pay-as-you-go billing keeps your cost aligned with the months you actually have payroll.

Does workers' comp cover me as the owner?

It depends on your entity type and state. Corporate officers and LLC members are often covered unless they opt out in writing, while sole proprietors usually aren't covered unless they choose to be.

This article is general information, not legal advice. Coverage and premiums depend on underwriting and your business details. Bliss Marc International Corporation is a licensed insurance agency, California License #0H92044 and Illinois License #100299879.