California Workers' Comp Class Codes: How WCIRB Classifications Work (2026)

A California workers' comp class code is a four-digit number from the Workers' Compensation Insurance Rating Bureau of California (WCIRB). It describes the kind of work your business does, and your insurer uses it to price every $100 of payroll. The codes come from the WCIRB's own system, not from the National Council on Compensation Insurance (NCCI).^[1] The WCIRB's classifications live in the California Uniform Statistical Reporting Plan (USRP), which the Insurance Commissioner adopts as a regulation. So a code number or wage rule from another state may not apply here.

This guide explains how California codes are built and assigned, and which exceptions let office and sales staff be rated separately. It includes a table of common construction codes with the hourly wage thresholds that took effect September 1, 2026, and shows what to do if your code is wrong. For how the premium itself is built, see our workers' compensation insurance guide, or request a workers' comp quote with your current codes in hand.

What is a workers' comp class code in California?

It is the WCIRB classification that best describes your business operations. California law requires the Insurance Commissioner to designate a rating organization "to develop a classification system," and requires every workers' comp insurer to report its experience under the approved uniform statistical plan.^[1] That organization is the WCIRB. The plan, the California Workers' Compensation Uniform Statistical Reporting Plan—1995, is adopted by regulation at Title 10, section 2318.6 of the California Code of Regulations. The text is not printed in the code itself; the WCIRB publishes it.^[2]

The plan changes every year. The WCIRB's September 1, 2026 regulatory filing amended the USRP's Standard Classification System, including "the wage and payroll limitations and dual wage thresholds."^[3] The Insurance Commissioner approved the changes on May 15, 2026, effective for policies starting on or after September 1, 2026.^[4]

An insurer may in theory file its own classification system. The law requires the insurer to show that its data can still be reported under the WCIRB's plan.^[1] In practice, the WCIRB code is what normally appears on your policy, your audit and your experience rating.

How is your class code assigned?

The insurer assigns it at underwriting, from what you tell it about your operations, and the auditor checks it after the policy year. California's system classifies the employer's operation first. Each job or location is assigned to its governing classification. For example, when a contractor puts up or takes down its own scaffolding on its own jobs, that work goes to "the employer's governing classification at a particular job or location," not to a separate scaffolding code.^[3] The WCIRB builds each classification from California payroll and loss data. The 2026 filing's review sheets list, for each code, the payroll, claim counts and losses behind its rate relativity.^[3]

Three questions decide most assignments:

1. What does the business do for its customers? A plumbing contractor is generally classified by its plumbing work, not by its trucks or its office.
2. Does any employee qualify for a standard exception? Clerical office staff and outside salespeople may be split out if they meet the exception rules.
3. For construction, what is each worker's regular hourly wage? It decides the low-wage or high-wage code in a dual wage pair.

What are the standard exception classifications?

They are a short list of classes that can be reported separately from the governing class, under Section III, Rule 4 of the USRP. The ones most employers meet are 8810 Clerical Office Employees, 8871 Clerical Telecommuter Employees and 8742 Salespersons – Outside.^[3] They matter because the expected cost of claims on office and sales payroll is a small fraction of field payroll. The WCIRB's experience rating table for September 1, 2026 sets expected losses per $100 of payroll at 0.093 for 8810 and 0.132 for 8742. For comparison, it sets 4.051 for 5403 low-wage carpentry and 6.087 for 5552 low-wage roofing.^[3] These are expected loss rates used to calculate experience mods, not premium rates, but they show how far apart the classes sit.

The exceptions have strict limits. For construction employers, the 2026 filing spells out when a construction-side employee may be reported as 8742. The employee's non-clerical duties must be confined to visiting job sites for pre-construction estimating or meeting clients. The employee must also have no supervisory duties over construction operations, and must not walk job sites to assess progress, check quality or check safety compliance.^[3] An estimator who also checks on crews does not qualify. Staff who edit digital files or create computer animation for a film company can be assigned to 8810 or 8871, "subject to the Standard Exceptions rule."^[3]

Read the full exception definitions in the USRP before you split anyone's payroll. A common audit issue is an employee reported as clerical who also works in the field; check that person's duties against the exception's conditions before reporting them as clerical. Our workers' comp audit guide shows how auditors test that split.

Which class codes do California contractors use?

Most construction trades in California have a dual wage pair: one code for employees below an hourly wage threshold and one for employees at or above it. The high-wage code applies only if the employee's wage is verified at the final audit. For Carpentry, the payroll of an employee "whose regular hourly wage is not shown to equal or exceed" the threshold goes to the low-wage code, 5403.^[3] The table lists common trades and the thresholds approved for policies starting on or after September 1, 2026.^[3][4]

Source: WCIRB September 1, 2026 Regulatory Filing, Section A, as approved by the Insurance Commissioner. Titles are shortened; the USRP wording controls. The table shows no rates. The WCIRB publishes class-level advisory pure premium rates separately, and insurers file their own rates.

A few related codes appear on many construction policies:^[3]

• 5606 Contractors – construction or erection – executive level supervisors applies only when at least two levels of supervision sit between the supervisor and the workers doing construction, or when all construction is subcontracted to licensed contractors. One employee's payroll cannot be divided between 5606 and another class. It does not apply to employees whose job site duties are limited to estimating, outside sales or public relations.
• 5610 Contractors – construction or erection – all construction subcontracted applies on jobs where all construction is subcontracted to licensed subcontractors, including job site cleaning and warranty repairs.
• 9015(1) Building Operation – N.O.C. now applies to minor repairs for others only when the work needs no building permit and stays under the Business and Professions Code's minor-work license exemption limit. That rule changed on September 1, 2026.
• 5146(1) Cabinet, Fixture or Trim Installation and 5107 Door, Door Frame or Pre-Glazed Window Installation apply only if the employer does no rough carpentry at the same job or location.

How does your class code affect your premium?

The code sets the rate, and the rate multiplies your payroll. The Department of Insurance says an employer's premium can "fluctuate greatly" with the classification of the business, the mix of employees and operations, and actual claims experience.^[5] For September 1, 2026, the Insurance Commissioner adopted an average advisory pure premium rate of $1.65 per $100 of payroll, a 6.6% increase from the 2025 rate. The rate is advisory: "insurance companies are not bound by it and are free to set their own rates."^[6]

The advisory rate is only the expected cost of claims and claims handling. It leaves out insurer expenses and profit. The Department's actuaries reported an industry average filed manual rate of $2.48 per $100 of payroll as of January 1, 2026. They put the 2025 average charged rate, after schedule credits and other rating plan adjustments, at $1.56.^[5] A clerical code and a roofing code sit at very different points around those averages. That is why one wrong code can change a bill more than any discount.

Codes also feed your experience mod. From September 1, 2026, a California employer qualifies for experience rating when its expected losses, calculated from payroll by class, reach $11,700, up from $10,800.^[3] Our experience mod guide explains how the experience modification rate is built from those class-by-class expected losses.

What happens if you are misclassified?

The audit usually finds it, and the final bill is recalculated using the code the auditor applies. A dual wage split is the most common example. If your payroll records do not prove a carpenter's regular hourly wage met the threshold, the auditor moves that payroll to the low-wage code, 5403.^[3] Clerical or outside sales payroll that does not meet the exception rules moves to the governing class.

Misclassification can also run in your favor. If you have been placed in a higher-rated code than your operations support, you may be able to correct it going forward. When an insurer changes your classification in a way that raises your premium, it must notify you in writing of the change and the reasons, within 30 days after adopting it. The notice must also tell you your right to request reconsideration and appeal.^[7]

How do you find or appeal your class code?

Find it. Your code is on your policy's information page and on each audit statement. Licensed contractors must also list up to the top three classification codes on their policy, by highest estimated payroll, with the Contractors State License Board. The board notes that it does not verify those codes and that a shared policy may show codes that do not match a particular license.^[8] The WCIRB posts the USRP and its regulatory filings on its website, wcirb.com.^[3]

Challenge it. Use the two-step process in the Insurance Code:

1. Ask for reconsideration

   Write to the insurer, or to the WCIRB if the WCIRB made the classification decision. Explain the operations and attach evidence: job descriptions, payroll by employee, contracts and photos. Anyone aggrieved by a rating organization's decision may request reconsideration.^[7] Insurers and rating organizations must also offer a way to review how their rating system was applied to you.^[9]

2. Appeal to the Insurance Commissioner

   If the WCIRB rejects the request, or does not act on it within 30 days, you may appeal to the Commissioner by filing a written complaint and request for a hearing.^[7] For an appeal of an insurer's or rating organization's action on a review request, the deadline is 30 days after written notice of that action.^[9]

Fix the code before the next audit if you can. A correct code on a new policy is far easier to get than a refund after a year of the wrong one.

This guide is for educational purposes. It summarizes the WCIRB's September 1, 2026 regulatory filing as approved by the Insurance Commissioner, California statutes and Department of Insurance publications. The USRP and your policy control your classification. Menlo Insurance Services is a licensed California insurance broker (license 6020106) and may earn a commission on policies it places. Talk to a licensed broker about your actual exposures.

The Bottom Line

California workers' comp class codes come from the WCIRB, not NCCI. The code follows what your business does, not job titles. Office and outside sales staff can be split out only under strict exception rules. Most construction trades have a low-wage and a high-wage code, and the thresholds went up on September 1, 2026. Check your codes before renewal, keep payroll records that prove wage splits, and use reconsideration and appeal if the code is wrong. To have the codes and wage splits reviewed before your next policy, request a California workers' comp quote.