Workers’ Comp Class Codes for Trades: A Plain-English Guide (2026)

Most trade owners buy workers’ comp the way they buy truck tires: get a quote, sign, forget about it. Then the audit letter shows up. The auditor says your office manager was coded as an HVAC tech, your subs didn’t have their own coverage, and you owe another $11,000.

Almost all of that comes down to class codes. Here’s how they work, which ones trades use, and where shops get burned.

How your premium is calculated

The core formula is simple:

Then carriers add or subtract things like schedule credits or debits, premium discounts, expense constants, and state assessments. But the class code sets the rate, and the rate is the biggest lever.

Example: $400,000 of HVAC tech payroll in a class with a rate of $3.00 per $100 is $12,000 before your mod. If $60,000 of that payroll is really your office manager, who belongs in clerical at a fraction of the rate, putting her in the right class can save real money every year. Rates vary widely by state and carrier; use your own quote.

Class codes for common trades

These are NCCI codes from Tennessee’s published list of contracting classifications (effective March 1, 2020), plus a few standard non-construction codes. States that use NCCI generally use the same numbers; descriptions can vary slightly.

Sources: Tennessee Department of Commerce & Insurance, WC Contracting Codes List (eff. 3/1/2020); InsuranceXDate class lookups for 9014 and 7219. “NOC” means “not otherwise classified.”

Note the “& Drivers” on most of these. In NCCI states, a tech who drives a van to jobs is normally in the trade code, not a separate driver code.

Trades without a neat code

Several trades in this industry don’t map cleanly to one code, and classification depends on the operations described in the application:

• Locksmiths: there’s no single “locksmith” workers’ comp code in the lookups we checked. Carriers classify based on whether you run a retail shop, mobile service, or installation work.
• Appliance repair: be careful. NCCI class 9519 is described in most states as “Air Conditioning Systems—Portable Units—Installation, Service or Repair,” while New Jersey uses 9519 for household appliance service and repair.
• Towing: 7219 is general trucking; towing may be classified differently depending on state and operations.
• Pest control: state-specific codes exist (for example, Texas 4519 and California 5650 per InsuranceXDate’s lookup).
• Handyman: usually classified by the work actually done, which is why handyman shops get reclassified at audit so often.

For these, write a clear description of what your techs actually do, ask your agent which code they used and why, and keep that explanation for audit time.

Office, sales, and supervisors

The rule of thumb: separate classification only works if the person really doesn’t do the field work, and you can show it.

When techs do more than one kind of work

A tech who does both HVAC and electrical, or a handyman who does carpentry and plumbing, is common in trades. In NCCI states, construction payroll can generally be split between classes only if you keep verifiable records of the hours spent in each type of work. Without those records, the payroll typically goes to the highest-rated class involved.

That’s where your job records matter. Timestamped jobs tagged by type of work, tied to each tech, are the kind of documentation that supports a split. More on how licensing limits who can do what in what a handyman can do without a license.

Overtime and what counts as payroll

• Payroll for comp generally includes wages, commissions, bonuses, and holiday and vacation pay.
• The overtime premium (the extra half in time and a half) is generally excluded from comp payroll in NCCI states, but only if your payroll records show it separately.
• That same overtime premium is what counts for the federal no-tax-on-overtime deduction. See no tax on overtime for trade technicians.

Subcontractors and the audit surprise

This is the number-one audit shock in the trades. If you pay a subcontractor who doesn’t carry their own workers’ comp, your carrier will generally treat what you paid them as your payroll, in your highest applicable class, and bill you for it at audit.

Your experience mod

• 1.00 is average. Below 1.00 means fewer or smaller claims than expected for your size and class; above 1.00 costs you more.
• It uses past years of claims, typically three, excluding the most recent year.
• Claim frequency hurts more than severity. Several small claims usually raise a mod more than one large claim.
• Not every small business gets one. Eligibility depends on premium size and varies by state.
• A high mod can cost you work. Many commercial customers and GCs screen subs by EMR.

Fewer injuries means a lower mod. See what happens when a tech gets hurt and OSHA’s top 10 violations.

NCCI, independent bureaus, and state funds

Source: Next Insurance, workers’ compensation class codes guide, checked November 2026.

If you work in more than one state, your codes and rates can differ for the same tech doing the same work. California, for example, uses its own WCIRB classification system.

Texas: the opt-out state

Texas is the only state where most private employers can choose not to carry workers’ comp. Employers who opt out are called non-subscribers, and they give up important legal protections in injury lawsuits. Many commercial customers and GCs also require subs to carry comp. If you’re in Texas, make that choice deliberately, with your agent and an attorney. More in contractor insurance requirements by state.

Surviving the annual audit

1. Check your codes before the policy starts. Ask your agent which class each employee is in.
2. Keep payroll by employee and class, with overtime premium shown separately.
3. Keep time records for split payroll if techs work in more than one class.
4. Collect sub COIs all year, not the week before the audit.
5. Write down job duties for office, sales, and supervisor roles.
6. Review the audit worksheet. Auditors make mistakes. You can dispute a classification.

VortechPro can’t pick your class codes, but it does keep the field records auditors ask about: each job tied to a tech, tagged by type of work, with timestamps and photos. Pair that with your payroll records and splitting payroll between classes gets much easier to support. $99/mo for 5 techs, +$20 each.

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