If you run a crew, a kitchen or a repair shop in California, your workers' compensation renewal is about to arrive with a number on it that you didn't choose. For the second year running, the state's benchmark moved up before your insurer even looked at your file. You can't change the benchmark. You can change almost everything else, but only if you know how the bill is put together.
California's Insurance Commissioner adopted a new average advisory pure premium rate of $1.65 per $100 of payroll, effective September 1, 2026. That is 6.6% higher than the rate approved a year earlier. The state's rating bureau, the WCIRB, had asked for 10.4%. The Commissioner followed the recommendation of the Department of Insurance's own actuaries and approved less.
It follows an 8.7% increase on September 1, 2025, which came after more than a decade of flat or falling benchmark rates. California employers have now absorbed two increases back to back.
The Department of Insurance points to higher medical treatment costs, higher medical-legal costs, rising claim-adjustment expense, and more cumulative trauma claims. A cumulative trauma claim is an injury attributed to repetitive work over time (a back, a shoulder, a wrist) rather than to one accident on one day. These claims are typically harder to pin to a date and a cause.
Nationally, workers' comp is moving the other way. Brokers surveyed by CIAB reported workers' comp premiums down an average of 3.2% in the second quarter of 2026. In Florida, the rating bureau NCCI has recommended a 7.4% decrease for 2027, which would be that state's tenth straight annual decrease if regulators approve it. California is moving against the country. If you have locations in more than one state, that difference is worth a conversation on its own.
A pure premium rate is the state's estimate of what claims will cost, per $100 of payroll, for a given type of work. It covers the losses themselves (medical care, lost wages) and the expense of handling those claims. It does not include the insurer's administrative and overhead costs.
Two things follow. First, it is advisory. Insurers in California file their own rates. They use the benchmark as a starting point, and they are free to price above or below it. That is why two carriers can quote the same business very differently in the same week.
Second, because those other costs aren't in it, the rate you are charged is higher than the benchmark. The $1.65 is an average across every industry in the state. It is not your rate, and it was never meant to be.
Think of it as the wholesale cost of workplace injuries. When wholesale goes up, retail tends to follow. How much it follows, for you, depends on the next three numbers.
Strip away the endorsements and the fees and a workers' comp premium is a multiplication problem: class code rate × payroll (per $100) × experience modification.
Payroll also includes something many contractors don't expect: uninsured subcontractors. If you pay a subcontractor who can't show a valid certificate of insurance for their own workers' comp, your insurer may count what you paid them as your payroll at audit. One missing certificate can cost more than this year's rate increase. Ask your carrier how it treats subcontractors before the audit, not after.
Your experience modification, or X-Mod, is a multiplier that compares your claims history with what would be expected from a business of your size in your classifications. In California it is calculated by the WCIRB, using a formula approved by the Department of Insurance.
Very small policies don't qualify for one. The WCIRB sets the eligibility threshold. Above it, you get an X-Mod whether you want one or not.
Two details matter more than the rest. The X-Mod is built from three past policy years and leaves out the most recent one, so a bad year follows you for a while and a good safety program takes time to show up. And since 2017 the formula counts each claim only up to a cap, called the primary threshold, that is set by the size of your business. One large claim is limited by that cap, while several smaller claims each count in full. That is why a string of small lost-time claims can do more damage than one large one.
It is also the arithmetic case for a return-to-work program: getting an injured employee back on light duty can shorten the claim, and shorter claims are usually smaller claims. Your X-Mod is your safety record turned into a number and multiplied against your whole premium.
You can't negotiate the benchmark. Here is what you can work on before renewal.
We won't tell you we can make the rate increase disappear. We won't quote you on an estimated payroll we both know is low, just to show a smaller number today and let the audit deliver the rest. And we won't move you to a new carrier for a saving that a class-code correction would have found with the carrier you already have.
Si tienes un negocio en California y tu renovación de compensación laboral viene en camino, revisamos tus clasificaciones, tu X-Mod y tus certificados de subcontratistas antes de que llegue la auditoría. En inglés o en español, con el mismo corredor y la misma línea directa: (888) 585-9910. ¡Sí, hablamos español!
New Decade Insurance is an independent brokerage built by agents who have been writing insurance since 2005. Licensed in CA, TX, FL and AZ.
This article is general information, not insurance, legal or tax advice, and not a quote. Rates, classifications and experience modifications depend on your operation, your payroll and carrier underwriting. Advisory pure premium rates are averages published by the California Department of Insurance and are not the rate any individual employer pays.
A licensed broker will check your class codes, your X-Mod worksheet and your subcontractor certificates, then take your file to the carriers writing workers' comp in your state. Get a quote, or call (888) 585-9910.