Workers’ Compensation Class Codes

Quick Answer

Workers’ compensation class codes are job classifications insurers use to set your premium based on the type of work your employees do and how risky it is. If your workers are put in the wrong code, or you don’t separate payroll correctly, you can overpay (sometimes by a lot) and still have audit surprises at year-end. The best way to avoid this is to confirm your correct governing class code, keep clean payroll records by job type, and review your code assignments before renewal and during audits.

How They Work, Why They Matter, and How to Avoid Overpaying

Workers’ compensation class codes are supposed to be straightforward. In reality, however, they are one of the most misunderstood and expensive parts of a workers’ comp policy.

With nearly 800 class codes in use across the U.S., even small mistakes can lead to overpaying for years, surprise audit bills, or penalties from state boards. This guide explains what workers compensation class codes are, how they’re assigned, why they impact your premium so heavily, and how to avoid the most common (and costly) mistakes.

What Are Workers Compensation Class Codes and Why Do They Exist?

Workers compensation class codes are four-digit classification numbers used to describe the type of work your business performs.

Each class code corresponds to:

A level of workplace risk

A rate used to calculate your workers’ compensation premium

The purpose of class codes is to group similar businesses together so insurers can price risk fairly. As a result, higher-risk work has higher rates, while lower-risk work has lower rates.

How the Classification System Works

According to the National Council on Compensation Insurance (NCCI), the classification system was developed to provide an orderly method of grouping similar employers where each workers comp class code reflects job exposures common to them. Therefore, it’s important to understand that it is the business of an employer that is classified, not separate occupations or jobs of individual employees within the business.

The NCCI Scopes Manual serves as the definitive reference for classification codes, providing comprehensive descriptions and detail around the operations and exposure anticipated for each class code by state.

How Do Workers Compensation Class Codes Affect Your Insurance Premium?

Class codes are one of the biggest drivers of workers’ compensation cost.

Your premium is generally calculated by:

Assigning a class code

Applying a rate to every $100 of payroll in that class

If the class code is wrong, even slightly, the premium impact can be significant. Consequently, a business misclassified into a higher-risk code may overpay thousands of dollars per year.

Real-World Premium Impact

Consider this comparison of actual class code rates:

Class Code	Description	Typical Rate per $100 Payroll
8810	Clerical Office Employees	$0.16 – $0.35
5403	Carpentry NOC	$7.29 – $9.38
5551	Roofing	$15.00 – $25.00+
8742	Outside Salesperson	$0.35 – $0.50

As you can see, the difference between clerical and construction rates can exceed 40 times the cost. Therefore, proper classification becomes absolutely critical to managing insurance expenses.

Are Workers Compensation Class Codes the Same in Every State?

No, not exactly.

Most states follow the NCCI system, which standardizes class codes across 35 states. However:

Four states are monopolistic and run workers’ comp entirely through the state
Eleven states operate their own independent rating bureaus
Five states (California, New Jersey, New York, Delaware, and Pennsylvania) have opted out entirely

If you have employees in multiple states, moreover, the applicable class codes are governed by the home state of the employee, not your headquarters.

Monopolistic States

These four states require business owners to purchase coverage through state agencies:

North Dakota
Ohio
Washington
Wyoming

In these states, consequently, private insurance carriers cannot offer workers’ compensation coverage.

What Is the NCCI and How Does It Regulate Workers Compensation Class Codes?

The NCCI (National Council on Compensation Insurance) maintains:

The classification system

The Scopes Manual

Loss cost rates for most states

Furthermore, the NCCI’s role is to standardize how class codes are defined and applied so insurers and employers are working from the same rules, at least in participating states.

According to the U.S. Department of Labor, the NCCI manages the nation’s largest database of workers’ compensation insurance information. The organization collects and analyzes data from 68.8 million medical transactions, 3.3 million insurance policies, and detailed claim information for about 210,000 claims annually.

What 40+ Years Taught Me About This Risk

In over four decades of working with businesses on workers’ compensation insurance, I’ve seen countless companies overpay simply because their class codes were assigned incorrectly at policy inception. The most expensive mistake? Accepting the first classification without questioning whether a more accurate (and often less expensive) code exists. Most business owners don’t realize that class code assignment isn’t always black and white, and small details can make a huge difference in annual premium costs.

How Are Workers Compensation Class Codes Assigned When a Policy Is First Written?

When a workers’ comp policy is first issued:

The agent or broker assigns the initial class codes
This is based on how the business operations are described
Early-stage businesses are especially prone to misclassification

Unfortunately, mistakes at the beginning often carry forward until an audit forces a correction, usually with additional premium due.

Who Assigns Class Codes?

Class codes can be initially assigned or modified by several different sources:

Insurance Agent – Workers compensation class codes can be initially assigned by an insurance agent who provides coverage to the employer. The agent will typically ask qualifying questions to determine exactly what operations the business performs.
Insurance Company Underwriter – After an agent submits the application, it will be reviewed by the underwriter who may agree with the agent in classification or change the class code to another they feel is more appropriate.
Insurance Company Auditor – After the policy period expires and an audit is performed, the auditor may adjust the code to better fit the operation as they see the need.
NCCI and Advisory Organizations – These organizations have the responsibility to interpret and apply class codes. Sometimes, moreover, they are requested to inspect and render opinions on proper classes to use.

Why Does Your Business Operation Determine the Class Code Instead of Job Titles?

This is where many employers (and brokers) get it wrong. Workers compensation class codes are assigned based on the overall business operation, not individual job tasks. This is known as the governing classification. You start by classifying the business first. From there, certain employee groups may be separated, but only if allowed by state rules.

Understanding Governing Classification

The governing classification principle is fundamental to proper class code assignment. For instance, if you operate a landscaping company, your governing class code represents landscaping operations. All field operations fall under that code. You cannot usually split payroll by individual tasks like mowing, trimming, or planting because those tasks are part of the governing operation.

What Is a Governing Class Code and Why Does It Matter So Much?

The governing class code is the primary classification that represents what your business does.

For example:

A landscaping company is governed by the landscaper class code
All field operations fall under that code
You cannot usually split payroll by individual tasks like mowing, trimming, or planting

Those tasks are part of the governing operation. Consequently, understanding your governing classification prevents costly misclassification errors.

When Can Clerical or Other Employee Classes Be Separated?

One common exception is clerical office employees.

If clerical staff:

Work exclusively in an office environment
Are physically separated from operations

They may qualify for a lower-rated clerical class code (typically 8810).

Other exceptions exist, but they require strict documentation and adherence to state rules. Furthermore, some states have specific requirements about the physical separation needed to qualify for clerical classification.

Standard Exception Classifications

In addition to clerical employees, standard exception classifications may include:

Outside sales representatives
Drivers (when operations warrant separate classification)
Certain types of executive officers

However, these exceptions vary by state and must be properly documented to withstand audit scrutiny.

Can Payroll Be Split Between Multiple Workers Compensation Class Codes?

Sometimes, but not easily.

Payroll splitting is allowed only when:

The work is clearly separable

Accurate payroll records exist

State rules permit the separation

Without documentation, insurers will default to the highest-rated applicable class code, which increases premium. Therefore, maintaining detailed payroll records becomes essential for businesses with multiple operations.

How Do Workers Compensation Audits Change Class Codes After the Policy Period?

At the end of each policy term, insurers conduct a workers’ comp audit to:

True up payroll

Review job classifications

Reclassify employees if necessary

Auditors have authority to adjust class codes, and changes often result in additional premium due. Moreover, if auditors discover willful misclassification, you might be responsible for fines or other penalties, depending on your state.

The Audit Process

According to industry standards, annual audits verify reported data and may uncover discrepancies. Misreporting can result in:

Backdated premium adjustments
Penalties for intentional misclassification
Denied claims if work performed falls outside classified operations
Policy cancellation for repeated or severe violations

How Can You Tell If the Class Codes on Your Workers Comp Policy Are Correct?

This is difficult for most employers to determine alone.

Correct classification requires:

Reviewing state or NCCI manuals

Understanding governing class rules

Evaluating payroll records and operations

This is why many employers only discover problems after an audit. Additionally, the complexity of the 700+ available codes makes self-verification challenging without professional guidance.

How Do Workers Compensation Class Codes Impact Audit Bills and Penalties?

If misclassification is found:

Insurers can charge back premiums
Lookbacks may extend up to three years
Some states allow penalties on top of back premiums

What looked like “saving money” upfront can turn into a large, unexpected bill. Furthermore, if your insurer audits your account and discovers you used “safer” codes than you should have, it might retroactively bill you for up to three years of additional premiums.

The Cost of Misclassification

According to insurance industry data, businesses with incorrect class codes typically face audit bills ranging from $5,000 to $50,000+ depending on:

Size of payroll
Difference between correct and incorrect rates
Number of years subject to lookback
Whether misclassification was deemed intentional

How Can Subcontractors Create Workers Compensation Class Code Problems?

Subcontractors are a major audit risk.

Common issues include:

Subs carrying workers’ comp for clerical only

Owners excluded from coverage

Certificates that don’t match actual operations

When this happens, the hiring company may be charged for the subcontractor’s payroll under a higher class code. Consequently, verifying subcontractor coverage becomes a critical risk management function.

Real-World Subcontractor Scenario

Consider this common situation: A small subcontractor has a workers comp policy covering his clerical employee, but excludes the owners (which is permissible in many states). The business owner submits the sub’s certificate at their audit to the auditor and finds out that only the clerical class code is being deployed on the carpenter’s policy. Now the hiring company is charged the full cost of the sub’s work in the high-cost carpenter rate class.

How Can You Find Workers Compensation Rates by Class Code in Your State?

This is more complex than it appears.

Rates are made up of:

Loss cost rates (often published)
Loss cost multipliers (LCMs) set by insurers

LCMs vary by insurer and underwriting tier and are rarely public. Online rate lookups rarely reflect the actual premium you’ll pay. Therefore, working with an experienced broker who has access to multiple carriers becomes essential for securing competitive rates.

Where to Look Up Class Codes

For NCCI states, you can use the NCCI Class Look-Up tool to search class codes. Additionally, many state rating bureaus provide their own lookup tools:

California WCIRB
State-specific workers’ compensation boards
Insurance carrier websites

However, these tools provide only the class code descriptions, not necessarily the rates you’ll pay.

What Are the Biggest Mistakes Business Owners Make with Workers Compensation Class Codes?

The most common mistakes include:

Buying workers’ comp online and misclassifying operations – Online portals suggest codes based on limited information
Accepting automated class code suggestions – Without understanding if a more accurate (and less expensive) code exists
Assuming subcontractors are properly covered – Failing to verify actual coverage matches certificates
Ignoring audit warnings until it’s too late – Waiting to address classification issues until facing a large bill

These mistakes are common and expensive. Furthermore, many businesses continue overpaying for years without realizing their initial classification was incorrect.

The Online Buying Trap

The third mistake I’ve seen pretty often is when business owners go online to buy a policy and accept the results of the online portal’s suggestion for class code, not knowing that another code would legitimately work and cost less. This is where the complexity of the class code system can trip up someone who isn’t familiar with the nuances of classification rules.

Why Does Working with a Skilled Broker Matter for Workers Compensation Class Codes?

A skilled broker:

Researches state and NCCI rules
Documents operations correctly
Coordinates with underwriters and auditors
Helps prevent surprises at audit time

This isn’t about gaming the system; rather, it’s about getting it right from the beginning. Moreover, experienced brokers understand the subtle differences between similar class codes that can significantly impact premium costs.

The Value of Expertise

According to workers’ compensation experts, determining the proper classifications for an employer is not easy and sometimes can be quite difficult. With nearly 700 different codes available for use, it is certainly easy to see how mistakes or errors can be made. Misclassification of employers’ operations occurs each and every day. Many employers go for years being slotted into wrong, more expensive class codes resulting in thousands of dollars of overpaid workers compensation premium.

How Can Business Owners Make Sure Their Workers Compensation Class Codes Are Correct?

The safest approach includes:

Reviewing class codes before binding coverage – Don’t accept the first classification without questioning
Auditing classifications at renewal – Annual reviews catch changes in operations
Maintaining clear payroll and job records – Documentation supports proper classification
Addressing subcontractor exposure proactively – Verify coverage before work begins
Working with professionals who understand the system – Leverage expertise in classification rules

Workers compensation class codes are complex, but ignoring them is far more costly than addressing them early. Additionally, regular reviews ensure your classification remains accurate as your business evolves.

Annual Classification Review Checklist

At renewal time, review:

Any changes in business operations
New services or products offered
Changes in employee duties
Expansion into new locations or states
Acquisition of new equipment or processes
Experience modification factors that may have changed

Frequently Asked Questions About Workers Compensation Class Codes

According to the NCCI, there are between 700 and 800 individual classification codes used across the United States. However, an average of 327 classes are in use for any given state, with approximately 1,400 descriptions total. The number varies by state depending on whether they follow NCCI standards or maintain their own classification system.

Yes, your class code can change during the policy period, although it typically happens during the annual audit process. If your business operations change significantly, such as adding new services or changing your primary business activity, your insurer may adjust your classification. Additionally, auditors have the authority to reclassify employees if they discover the initial classification was incorrect.

If you disagree with your assigned class code, you should first discuss the classification with your insurance agent or broker. They can review the NCCI Scopes Manual or state-specific guidelines to determine if an alternative classification is more appropriate. If disputes continue, you can request a formal classification review from NCCI or your state’s rating bureau. It’s essential to address classification concerns before policy binding rather than waiting until audit time.

No, part-time and seasonal employees are classified using the same class codes as full-time employees performing the same work. The classification is based on the type of work performed, not the employment status or hours worked. However, all employees must be included in the payroll calculation for workers’ compensation purposes, regardless of whether they work full-time, part-time, temporary, or seasonal schedules.

Class code rates can change annually, although the frequency varies by state and market conditions. According to NCCI’s 2025 State of the Line report, rates are adjusted based on claims data, medical cost trends, and overall market performance. In 2024, for instance, NCCI recommended rate reductions in multiple states due to improved workplace safety and reduced claims severity. Rate changes typically take effect at the beginning of each calendar year or policy anniversary date.

NCCI codes are standardized classifications used in 35 states that follow the NCCI system. State-specific codes are used in states that maintain their own classification systems, such as California, New Jersey, New York, Delaware, and Pennsylvania. While many classifications are similar across systems, the code numbers, descriptions, and rates can differ significantly. Businesses operating in multiple states must understand which system applies in each jurisdiction.

Yes, you can challenge audit results if you believe the classification or payroll calculations are incorrect. Most insurers have a formal dispute resolution process that allows you to provide additional documentation supporting your position. It’s important to respond quickly to audit findings, as there are typically time limits for filing disputes. Working with an experienced broker can help you navigate the dispute process effectively.

When employees perform multiple types of work, the classification generally follows the governing classification rule unless the state allows payroll splitting. In most cases, if the employee’s duties fall within the scope of the governing classification, all their payroll is assigned to that code. However, if employees perform clearly separable work with distinct operations, and if you maintain detailed time records, you may be able to split payroll between different classifications. This requires careful documentation and state approval.

Essential documentation includes detailed job descriptions for all positions, time records showing hours worked by classification (if splitting payroll), payroll records broken down by employee and classification, subcontractor certificates of insurance, and written policies defining job duties and reporting relationships. Additionally, keep copies of previous audits, classification assignments, and any correspondence with insurers regarding class codes. This documentation becomes critical during audits and classification reviews.

Construction class codes carry higher rates because statistical data shows these occupations have higher injury frequencies and severities compared to other industries. According to the Bureau of Labor Statistics, construction workers face risks from falls, equipment accidents, material handling injuries, and environmental exposures. The rates reflect the actual cost of claims paid for workers in each classification, making inherently dangerous work more expensive to insure.

Taking Action on Your Workers Compensation Class Codes

Understanding workers compensation class codes isn’t just about insurance compliance; rather, it’s about protecting your business from unnecessary costs and ensuring proper coverage when claims occur.

The complexity of the classification system means that small details can have significant financial consequences. Therefore, whether you’re securing your first workers’ comp policy or reviewing coverage at renewal, taking time to verify your class codes can save thousands of dollars annually.

Next Steps

If you’re concerned about your current classification or want to verify you’re not overpaying, schedule a consultation with our team.

schedule a consultation

We’ll review your operations, verify your class codes, and ensure you have the right protection at the right price.

Don’t wait until an audit reveals problems. Moreover, proactive classification review protects you from surprise bills and ensures your workers’ compensation insurance accurately reflects your actual business operations.

Author’s Expertise

This article was written by Gordon B. Coyle, CPCU, ARM, AMIM, PWCA, CEO of The Coyle Group, who has over 40 years of experience working with business owners of all sizes and industries across the US, solving their insurance challenges. Gordon specializes in helping businesses navigate the complexities of workers’ compensation classification, ensuring proper coverage while minimizing unnecessary costs through accurate class code assignment and ongoing policy review.