Why Is My Workers' Comp Audit Bill So High? The 7 Usual Causes
A workers' comp audit bill that's thousands more than you expected usually traces back to a handful of causes. Here's how to find yours, and which ones you can fix.
Educational information only. Not insurance, legal, or consulting advice. TrueUpAudit is not an insurance agency or consultant. Rules differ by state and carrier. Always check your policy and your carrier's audit notice.
The short answer
Your workers' comp policy was priced at the start of the year on estimated payroll. You paid a deposit premium based on that estimate. After the policy ended, the carrier audited your actual payroll and records and re-ran the same pricing. The audit bill is the difference.
So a big audit bill means one of two things: the estimate was too low, or the audit counted something it shouldn't have (or counted it in the wrong place). Your job is to figure out which, line by line.
How the premium is calculated
For each class code on your policy:
payroll ÷ 100 × rate = basic premium for that class
Add up the classes, multiply by your experience mod, then apply the other credits, discounts and fees on your policy. The rates and factors on your policy generally carry over to the final audit, so when the bill jumps, it's usually the payroll going into the formula that changed: how much there was, which class it went into, or what got added to it.
The 7 usual causes of a high audit bill
1. Your payroll grew more than the policy estimated
The most common, and the most legitimate, reason. If the policy estimated $150,000 of field payroll and you actually ran $220,000, you owe premium on the extra $70,000. Growth is good news for your business. It just wasn't paid for up front.
What to check: Compare the audited payroll for each class with your own payroll reports for the same policy dates (not the calendar year, unless they match). Make sure only payroll from the policy period was included.
Next year: If you grow mid-year, tell your agent and ask to update the estimate. A higher deposit hurts less than a surprise bill.
2. Subcontractors without certificates were counted as your payroll
If a sub didn't give you a certificate of insurance showing its own workers' comp, the auditor can treat some or all of what you paid that sub as your payroll. For contractors, this is often the biggest single line. Depending on the state, it can be the sub's actual payroll, a percentage of the contract price, or the whole contract price.
What to check: Ask for the sub-by-sub breakdown, then get certificates from every sub who had coverage. Read how uninsured subcontractor charges work and estimate yours with the Uninsured Sub Calculator.
3. Payroll was put into a more expensive class
Rates differ a lot between classes. Office work is usually rated far lower than field construction work. If the auditor decided some employees belong in a higher-rated class than your policy assumed, the bill goes up quickly, even if total payroll didn't change.
What to check: Look at each employee the auditor moved. Do the duties match the class they were put in? If an office manager was put in a field class, gather the evidence: job descriptions, the fact that they don't go to job sites, where they work. Ask the auditor in writing to explain the basis for each change.
4. Payroll couldn't be split between classes
Many small contractors have people who do some office work and some field work, or work across two trades. Payroll for one employee generally can't be divided between classes by estimate or percentage. You need payroll records that actually track hours or pay by class. Without them, the auditor may put all of that person's pay in the higher-rated class.
What to check: If you do have records that split the work (timecards by job type, payroll entries by class), send them. If you don't, the charge may stand for this year, so start tracking it now.
5. Overtime was counted at full value
In many states, the extra "premium" part of overtime pay can be left out of workers' comp payroll if your records show it separately. Per Travelers' audit guidance, that means excluding one-third of time-and-a-half pay, or one-half of double-time pay. Travelers notes this does not apply in Delaware or Pennsylvania, and rules can vary by carrier and state.
Example (made-up numbers): An employee earned $9,000 in time-and-a-half overtime. One-third, $3,000, is the premium portion. At a rate of $8.00 per $100, excluding it saves $240 for that one person.
What to check: Did your payroll reports break out overtime premium separately? If yes and it wasn't excluded, dispute it with the reports attached.
6. Owner or officer payroll was included
Owners, partners and corporate officers are treated differently depending on your business type, your state, and whether you chose to include or exclude yourself from coverage. Some states also set minimum and maximum amounts for officer payroll. If your audit included owner pay you expected to be excluded, or used a figure you don't recognize, ask why.
What to check: Your policy should show whether owners or officers are included or excluded. Compare that with the audit. If you filed an exclusion form, have a copy ready.
7. 1099 workers were treated as employees
Paying someone on a 1099 doesn't automatically keep them off your workers' comp audit. If they don't have their own coverage, or they work like employees, the auditor may count what you paid them as payroll. This overlaps with cause #2, and the fix is similar: certificates where they exist, and a careful look at whether the person is really an independent business.
Other things that can push the number up
- Missing or late audit paperwork. If the auditor didn't get your records, the bill may rest on estimates or carry extra charges, depending on the carrier. Send complete records and ask for a revised audit.
- A deposit that started too low. If the original estimate was unrealistic, the audit was always going to catch up. That isn't an error, but it's worth fixing for next year.
- Discounts or fees that changed with the premium size. Some policy factors depend on how big the final premium is. Ask the carrier to show every factor applied.
What to do now
- Find the dispute deadline on your audit invoice or notice.
- Get the full audit worksheet showing payroll by class, sub charges, rates and factors.
- Run the estimator to see which classes drive the increase.
- Sort the causes into "real growth" (you owe it) and "possible error" (dispute it).
- Dispute specifically, in writing, with proof. Follow our dispute guide and letter template.
And pay the part you agree with. It keeps your policy in good standing while you sort out the rest.
Frequently asked questions
Why is my workers' comp audit bill higher than my premium?
Your original premium was a deposit based on estimated payroll. The audit re-prices the policy using actual payroll and records. If actual payroll was higher, landed in more expensive classes, or included subcontractors without certificates, you owe the difference.
Is it normal to owe money after a workers' comp audit?
Yes, it's common when payroll grows or estimates were low. It's also common for audits to include charges that can be reduced with better records, such as certificates of insurance or overtime breakdowns. Check each line before you pay.
Can I exclude overtime from my workers' comp audit?
In many states, the premium portion of overtime can be excluded if your records show it separately: one-third of time-and-a-half pay or one-half of double-time pay. Some states, such as Delaware and Pennsylvania, don't allow this. Check your carrier's rules.
Can the auditor split an employee's pay between two class codes?
Generally only if your payroll records actually track the employee's pay by class. Payroll can't be divided by estimate or percentage.
How do I avoid a big audit bill next year?
Update your payroll estimate with your agent when your business grows, collect certificates of insurance from every subcontractor, record overtime premium separately, and track pay by class for employees who do more than one type of work.