Repair Shop Workers' Comp: Class Codes and Audits

A repair shop's workers' comp bill comes from three things: the class code your insurer assigns, your payroll, and an experience mod (a factor based on past claims). When you buy a shop, you usually inherit the seller's claims history. In the class code notes published by the North Carolina and Massachusetts rating bureaus, general repair shops fall in class 8380. North Carolina's notes rate body repair and towing for others separately, while Massachusetts keeps towing in 8380 unless it is 50% or more of gross receipts. Codes vary by state and bureau, and your insurer assigns yours. Use this guide before your first payroll audit.

The short answer

Class codes classify the business, not each job. Under the North Carolina Rate Bureau's notes for National Council on Compensation Insurance (NCCI) style codes, class 8380 covers a general repair shop including service writers and parts department staff, while body repair (8393) is rated separately.
Codes, definitions and even the bureau differ by state. California, Pennsylvania and Delaware use their own systems, and four states run monopolistic state funds.
Payroll on the policy is an estimate. The insurer audits actual payroll and can audit up to three years after the policy ends.
In NCCI states and several independent bureau states, a buyer usually inherits the seller's mod, and the ownership change must be reported to the insurer, generally within 90 days. The rating organization decides the result.
An uninsured subcontractor or sublet technician can be charged to your policy at audit.

How do the people in a repair shop map to class codes?

In a shop, premium is the rate for each class code, applied per $100 of payroll in that class, then adjusted by the experience mod. Classification follows the business, so the shop's governing class generally covers the technicians, advisors and parts staff at the location.

The table draws on North Carolina and Massachusetts bureau notes. Your state may word these rules differently.

Shop roles and how class codes generally treat them
Role	Typical duties	How the class notes generally treat it
Technicians	Inspect, diagnose, repair, lift and move heavy parts	Core of the automobile service or repair center class (8380)
Service writers and advisors	Deal with customers, write estimates	North Carolina's 2019 notice revised the 8380 note to include service writers
Parts counter staff	Sell and stock parts	The 8380 note includes parts department employees
Porters and drivers	Move cars, run parts and pickups	8380 is titled with drivers; check your state
Clerical office staff	Bookkeeping and phones	Standard exception 8810 only if the class does not already include clerical work and staff are separated from shop hazards
Automobile salespersons	Sell vehicles	Separately rated as 8748 in the North Carolina edition
Body repair staff	Metal, fiberglass and plastic body work, painting	Separately rated as 8393
Towing for others	Tow and roadside assistance	North Carolina's notes rate towing for others separately. Massachusetts keeps towing in 8380 unless it is 50% or more of gross receipts. The code differs by state and bureau.

Other codes sometimes attach to vehicle service businesses, such as automobile storage garage (8392), but whether they apply is the insurer's call. Check your state's code list. The workers' compensation page explains the basics.

What happens to the seller's claims history (the experience mod) when you buy?

The experience mod is a factor based on the shop's past payroll and claims. When a business changes hands, its history usually follows the business, so you usually inherit the seller's mod. Under the NCCI rules, a stock purchase, an asset purchase where you take over the operations and the formation of a successor entity all count as changes in ownership, so buying assets through a new LLC does not give you a fresh 1.00 mod. For a shop, that means a bad technician injury year, especially from lifts and lifting strains, can follow the business into your first renewal.

What to do after closing:

Within 90 days of closing, report the change to the insurer, in writing to be safe. In NCCI states and several independent bureau states the policy requires a report, so check your state's rule.
Send the ownership report. NCCI uses its Request for Ownership Information form or an online tool, and North Carolina (for intrastate risks), Pennsylvania and Delaware use their own bureau tools. An owner or officer signs it, and it lists both entities, the owners, tax ID numbers and policy numbers.
Keep the seller's payroll and class records you received.
Ask the insurer when the revised mod will be issued.

Who decides. The rating organization, which is NCCI or your state's bureau, decides the effect on the mod.

Late reports. Under current NCCI rules a recalculated mod applies back to the date of the change, up or down, so reporting late does not protect you from an increase. Failure to report may be treated as an attempt to avoid the experience rating, and the mod can be corrected. Some independent bureaus time the effective date differently.

Small shops and partial purchases. A very small shop may be below the state's minimum premium for a mod, in which case a factor of 1.00 applies, so ask the insurer whether yours has one. If you buy only part of a seller's operations, whether experience moves depends on whether the seller's insurer can split it out.

Successor liability for the seller's unpaid premiums differs by state, so ask deal counsel. See reviewing an experience mod for errors, who covers old claims in a stock or asset deal, the experience mod glossary entry and workers' comp cost.

What happens when a shop does mechanical and body work?

This is the classification question most worth asking before you buy. The North Carolina notes say class 8380 and class 8393 must not be assigned to the same employer unless the operations are separate and distinct businesses. A shop that added a paint booth and body work to its mechanical business may therefore face a question at audit, because the insurer may treat it as one class or the other, depending on the facts and the state's rules.

Where a manual allows both classes on one policy, payroll for one employee can be split between them only if records show the actual time and pay in each class. Estimates and percentage splits are not allowed, and without proper records all of that employee's pay generally goes into the highest-rated class involved. That rule appears in North Carolina's edition of the NCCI manual, and Oregon has a similar records rule (Oregon Administrative Rule 836-042-0060), so ask how your state handles it.

If you run both, ask the insurer to explain in writing how it will classify the operations and what records it wants kept separately. If your insurer assigns the wrong class, the fix is a correction request with evidence of what each person does. See workers' comp class code corrections.

How do you estimate payroll and avoid a surprise audit bill?

In a shop, the premium you pay during the year is a deposit built from an estimate of technician, advisor and parts counter pay. The final premium is set after the policy ends from actual payroll and the correct class codes. The insurer can audit your records during the policy period and for up to three years after it ends. Payroll counts wages, commissions, bonuses and paid holiday, vacation and sick time, so flat-rate and commission technician pay is included. The extra portion of overtime can be left out only if records show it separately by employee. State rules vary.

A hypothetical example. A buyer takes over a six-technician shop whose policy estimated $450,000 of payroll. After closing, the buyer moves two technicians from hourly to flat-rate pay with a monthly efficiency bonus, hires a service advisor and a salaried general manager. Flat-rate and bonus pay both count as payroll, and actual payroll reaches $540,000. The audit uses the actual figure, so the extra $90,000 is rated at the class rate and billed after the policy ends. For a buyer watching debt service or reporting to investors, that bill is an unbudgeted cash item that shows up months after closing, so put a payroll check on the quarterly calendar.

Ask the insurer to update the estimate when headcount or pay changes materially. How flat-rate and commission technicians are paid also raises overtime questions under wage and hour law. That is separate from workers' comp rating, so ask an employment attorney. Payroll estimates and audit bills and premium audit walk through the process.

Can a subcontractor or 1099 mechanic end up on your policy?

Shops may sublet work (send it out), such as transmission rebuilds, glass or mobile repair, and some use 1099 technicians. The policy's premium base includes pay to anyone engaged in work that could make the insurer liable, so a person without their own workers' comp can be charged to your policy at audit, using set percentages of the contract price if you have no payroll records. That does not apply if you can show the person's employer lawfully secured its own coverage, and each state's law decides whether the worker could make your insurer liable. Collect a certificate before work starts and keep it. See 1099 contractors and the audit bill.

Do you need to cover yourself, and does your state require workers' comp at all?

A shop owner who works a bay is exposed to the same lift and lifting injuries as a technician, so ask how your state treats an owner who works in the shop and whether you can elect coverage or exclude yourself.

Whether you must carry workers' comp at all is also set by state law. Texas, for example, lets most private employers choose not to carry it, according to the Texas Department of Insurance. In Ohio, North Dakota, Washington and Wyoming, workers' comp is bought from the state fund and private insurers cannot write it (Wyoming's mandatory coverage mainly applies to listed hazardous industries, as of a 2019 report, so confirm with the state). A state fund policy does not include employers liability, so businesses there usually add stop gap coverage, which fills that gap. In those four states only workers' comp comes from the fund. Garage liability and garagekeepers still come from the private market, so a shop there places two sets of coverage with different sources.

Which injuries shape a shop's claims, and what can you do?

Technician injuries cluster in a few patterns, and each points to a control you can document. In 2020, private industry automotive service technicians and mechanics had 9,940 injury and illness cases involving days away from work, or 185.9 per 10,000 full-time equivalent workers, according to the U.S. Bureau of Labor Statistics. The table shows how those cases broke down.

Lost-time injury causes for automotive technicians (2020) and controls that fit
Cause	Share of lost-time cases	Control that fits
Struck by an object or equipment	About 22%	Lift inspection and training records, written procedures for supporting vehicles
Exposure to harmful substances	About 13%	A chemical handling plan, protective equipment and labeled containers
Striking against an object	About 9%	Housekeeping and clear walkways
Overexertion in lifting	About 9%	A written plan for heavy parts, with mechanical assists
Falls to a lower level	About 6%	Pit covers or guards, ladder rules and fall protection for work above floor level

These figures are dated and describe the occupation, not a current rate for your shop, so use them as a pattern. A modified duty program can keep a strain from becoming a long claim. See return to work and claim cost control. Our guide to repair shop cost drivers shows how these records feed pricing, and insurance after you buy a repair shop places workers' comp in the full coverage list.

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Frequently asked questions

What class code does an auto repair shop use for workers' comp?

In the North Carolina and Massachusetts bureau notes, general repair shops are in class 8380. North Carolina's notes put body repair in class 8393 and rate towing for others separately, while Massachusetts keeps towing in 8380 unless it is 50% or more of gross receipts. Codes and definitions vary by state and bureau, and your insurer assigns the class, so ask how your shop is classified.

Do service writers and parts staff get their own class codes?

Not usually. North Carolina's notes say the repair center class includes parts department employees and, since 2019, service writers. Clerical staff may be rated separately only if they meet the standard exception. Check your state's manual.

Do I inherit the seller's experience mod when I buy a shop?

Usually. In NCCI states and several independent bureau states, a change in ownership, including an asset purchase where you take over the operations, generally transfers the seller's experience. Report the change within 90 days and the rating organization decides the effect on the mod. A very small shop may have no mod at all.

Can a subcontractor mechanic end up on my workers' comp bill?

Yes. If a person doing your work has no workers' comp of their own, the audit can charge that work to your policy. A certificate showing their employer's coverage, collected before the work, is the usual protection. State law decides the details.

What if my payroll estimate is too low?

The audit uses actual payroll, so you can owe a balance after the policy ends. Ask the insurer to update the estimate when headcount or pay changes, and keep records by employee and role.

References

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Send Morrow the declarations pages, loss runs and key contracts you inherited. Morrow can review them against the business you bought, flag gaps and request quotes where it makes sense. Any new terms depend on carrier underwriting.

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This article is general information, not legal, tax or financial advice, and not a coverage determination. Coverage depends on the actual policy wording, carrier underwriting, your purchase agreement and your contracts. Ask your attorney and accountant about deal and legal questions.

Workers' Comp and Class Codes for an Auto Repair Shop