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 on your workers' comp policy. 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 don't assume a code number or wage rule from another state works here.

Below we go through how California codes are built and assigned, and which exceptions let you rate office and sales staff separately. There's a table of common construction codes with the hourly wage thresholds that started September 1, 2026, and a section on 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's the WCIRB classification that best fits what your business does. 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]

On paper, an insurer can file its own classification system, as long as it shows its data can still be reported under the WCIRB's plan.^[1] In real life, the WCIRB code is what you'll see on your policy, your audit and your experience rating.

How is your class code assigned?

Your insurer picks it at underwriting, based on what you tell it about your work. After the policy year, the auditor checks it. California looks at 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]

Most of the time, three questions settle it:

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? That decides whether the low-wage or high-wage code applies in a dual wage pair.

What are the standard exception classifications?

They're a short list of classes you can report separately from your governing class, under Section III, Rule 4 of the USRP. The ones most employers run into are 8810 Clerical Office Employees, 8871 Clerical Telecommuter Employees and 8742 Salespersons – Outside.^[3] Why bother? Office and sales payroll is expected to produce a small fraction of the claim costs that field payroll does. 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] Those are expected loss rates for figuring experience mods, not premium rates. Still, they show you how far apart the classes are.

The exceptions are narrow. 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] So if your estimator also checks on crews, they don't 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. Audits often turn up someone reported as clerical who also works in the field. Before you call a person clerical, hold their actual duties up against the exception's conditions. 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. You only get the high-wage code if the auditor can verify the employee's wage at 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] Here are 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 gets multiplied by 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 only covers expected claims and the cost of handling them. Insurer expenses and profit aren't in it. 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 land very far apart around those averages. That's why one wrong code can move your bill more than any discount will.

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?

Usually the audit catches it, and your final bill gets recalculated with the auditor's code. 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.

It can go the other way too. If you've been put in a higher-rated code than your work calls for, you may be able to fix that 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]

If you can, fix the code before the next audit. Getting the right code on a new policy is much easier than chasing a refund after a year on 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

In California, workers' comp class codes come from the WCIRB, not NCCI. Your code follows the work your business actually does. Job titles don't decide it. 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. Look at your codes before renewal. Keep payroll records that prove your wage splits. If a code is wrong, ask for reconsideration, and appeal if you have to. To have the codes and wage splits reviewed before your next policy, request a California workers' comp quote.