If you’re a business owner paying workers’ compensation insurance, there’s a good chance you’ve been overcharged at some point. Industry analysts and premium recovery specialists consistently find that a large percentage of employers — some estimates suggest as many as two-thirds — have overpaid or are currently overpaying on their workers’ comp premiums.
The culprit? Errors buried in premium audits that most business owners never catch.
Workers’ comp audits happen at the end of each policy term. Your insurance carrier reviews your payroll, job classifications, and operations to determine your final premium. But these audits frequently contain mistakes — and those mistakes tend to result in higher premiums rather than lower ones.
Here are the 10 most common workers’ comp audit errors we encounter, and what they could be costing you.
1. Employee Misclassification
This is the single most expensive audit error. With nearly 700 NCCI class codes available (and additional state-specific codes in some jurisdictions), it’s easy for an auditor to assign your employees to the wrong — and often more expensive — classification.
For example, a clerical worker incorrectly classified as an outside salesperson could cost you 2.5 times more in premium. A warehouse worker classified as a driver creates a similar overcharge.
The problem is so widespread that the National Council on Compensation Insurance (NCCI) regularly highlights commonly misclassified job codes in their publications.
How to spot it: Compare each employee’s class code on your audit against their actual daily job duties. If the description doesn’t match what they do most of the day, you may have a misclassification.
What it costs you: Thousands per year in inflated premiums, compounding over multiple policy terms.
2. Overtime Pay Not Properly Excluded
Here’s a rule many employers don’t know: in most states, the premium portion of overtime pay should be excluded from your workers’ comp payroll calculation. If you pay time-and-a-half, only the straight-time portion should be included.
For example, if an employee earns $30/hour and works 10 hours of overtime at $45/hour, only $300 (not $450) of that overtime should count toward your premium calculation.
Many auditors include the full overtime amount, inflating your payroll numbers and your premium along with it.
How to spot it: Review your audit worksheet and compare the payroll figures against your actual payroll records. If overtime wasn’t separated out, you may be overpaying.
What it costs you: A 33% overcharge on every overtime dollar reported incorrectly.
3. Including Excluded Remuneration
Not everything you pay employees counts toward workers’ comp premiums. Common exclusions (which vary by state) include:
- Tips and gratuities
- Severance pay
- Group insurance and pension plan contributions
- Expense reimbursements
- Employer-provided perks (meals, lodging, travel)
- Uniform allowances
If your auditor doesn’t properly exclude these amounts, you’re paying premium on payroll that shouldn’t have been included.
How to spot it: Look at the total remuneration figure on your audit. If it matches your gross payroll exactly, exclusions may not have been applied.
What it costs you: Varies widely, but for businesses with generous benefits packages, this can add up to significant overcharges.
4. Owner/Officer Payroll Errors
Depending on your state and business structure (LLC, S-Corp, C-Corp, sole proprietorship), you may be able to exclude owners and officers from workers’ comp coverage entirely. Even when included, many states cap the payroll amount used for premium calculation.
A common audit mistake is including the full owner/officer payroll at the governing class rate when it should be capped or excluded altogether.
How to spot it: Check your state’s rules on owner/officer inclusion. If you’re paying premium on your full salary when your state caps it (some states cap as low as $45,000), you’re being overcharged.
What it costs you: Full premium on the payroll amount above the cap — potentially thousands per year for high-earning owners.
5. Subcontractor Coverage Charges
If you use subcontractors who don’t carry their own workers’ comp insurance, your carrier will typically add their payments to your payroll for premium calculation purposes.
The audit error happens when the auditor charges you for subcontractors who DO carry their own coverage. If you didn’t provide certificates of insurance during the audit, the auditor may have assumed they were uninsured.
How to spot it: Check whether subcontractor payments appear on your audit. If they do, verify whether those subs provided valid certificates of insurance for their own workers’ comp policies.
What it costs you: The full premium rate applied to every dollar paid to those subcontractors — often at high-risk classification rates.
6. Wrong Experience Modification Factor Applied
Your experience modification rate (EMR or e-mod) is multiplied against your base premium. If your mod contains errors — and industry specialists find that a majority of mod worksheets have at least one discrepancy — every dollar of premium is miscalculated.
Common mod errors include:
- Claims attributed to your policy that belong to another employer
- Closed claims still showing open reserves
- Payroll reported under incorrect class codes affecting expected losses
- Subrogation recoveries not credited back
How to spot it: Request your mod worksheet from your state’s rating bureau or NCCI. Compare every claim listed against your own records.
What it costs you: Even a 0.05 error in your mod can mean thousands in excess premium annually, multiplied across every year the error persists.
7. Incorrect Rate Application
The rates charged at the beginning of your policy period should generally remain consistent for the entire policy term. A common audit mistake is applying mid-term rate changes retroactively to your entire policy period.
If your rates look different on the audit statement than they did on your original policy declarations, the insurer may have made an error.
How to spot it: Compare the rate per $100 of payroll on your audit against your original policy declarations page.
What it costs you: Depends on the rate difference, but this error affects every dollar of payroll in the affected classification.
8. Dual Wages Not Separated
Many employees perform work in multiple classifications. A construction company owner who spends half their time in the office and half on job sites should have their payroll split between clerical and their trade classification.
Auditors often place all payroll into the highest-rated classification rather than properly splitting it. This is particularly common with employees who have mixed duties.
How to spot it: If you have employees who split time between office work and field work, check whether their payroll was divided between classifications or lumped into one.
What it costs you: The difference between your highest-rated class code and the lower-rated code, applied to all misallocated payroll.
9. Part-Time and Seasonal Employee Errors
Part-time and seasonal workers are sometimes counted at full-time equivalent payroll, or their wages are estimated rather than using actual figures. Both scenarios inflate your premium.
Additionally, temporary staffing agency workers should generally be covered under the agency’s policy, not yours. If temp worker payroll was included in your audit, that’s likely an error.
How to spot it: Verify that part-time employee payroll matches your actual records, not annualized estimates. Check if temp agency payments are included in your audit totals.
What it costs you: Full premium charges on payroll that shouldn’t be on your policy.
10. Prior Year Audit Errors Rolling Forward
Here’s the one that compounds over time: audit errors from previous years don’t just cost you once. They can affect your experience modification rate for up to four years, creating a cascading overpayment.
A single misclassification error in 2022 could still be inflating your mod — and your premium — in 2026. And since most businesses never review prior audits, these errors go undetected and uncorrected.
How to spot it: If your mod has increased without a clear reason (no significant claims), past audit errors may be feeding incorrect data into your mod calculation.
What it costs you: The original error amount, multiplied across multiple policy years through your inflated mod.
Real-World Example
A mid-size contractor with $80,000 in annual workers’ comp premium came to us after noticing their mod had crept up to 1.18 over three years. Upon review, we found two issues: a $42,000 claim that belonged to a different employer with a similar name, and three field supervisors whose payroll was entirely classified under the highest trade code instead of being split with clerical.
After filing corrections with NCCI and the carrier, the company received a refund of over $35,000 in past overpayments and saw their mod drop to 0.97 — saving an additional $16,000+ per year going forward.
(Details anonymized to protect client privacy)
How Far Back Can You Recover Overpaid Premiums?
Most states allow premium recovery going back three to six years, though the exact lookback period varies by jurisdiction. That means if you’ve been overpaying due to any of these errors, you could be entitled to a substantial refund — not just lower premiums going forward.
Frequently Asked Questions
How do I know if my workers’ comp audit has errors?
The most reliable way is to have your premium audits independently reviewed by a specialist who understands classification rules, payroll exclusions, and experience rating. Common warning signs include unexpected premium increases, class codes that don’t match job duties, or an experience mod above 1.0 without significant claims.
Can I dispute a workers’ comp audit?
Yes. Most states allow employers to dispute audit findings within a specified timeframe. You can dispute with your carrier directly or, if unresolved, escalate to your state’s insurance department or rating bureau.
How much does a workers’ comp premium recovery review cost?
Most legitimate premium recovery specialists work on a contingency basis — meaning no upfront fees, and you only pay if savings are found. The specialist’s fee comes from the recovered amount.
What documents do I need for a premium audit review?
Gather your current and past policy declarations pages, premium audit worksheets, experience modification worksheets, payroll records by employee, and certificates of insurance from subcontractors. The more years you can provide, the further back potential recoveries can go.
What Should You Do?
If any of these errors sound familiar, you may be leaving significant money on the table. The challenge is that most business owners don’t have the expertise to catch these mistakes, and insurance carriers have no incentive to find them for you.
That’s where a workers’ comp premium recovery specialist comes in. At Comp Recover, we review your past and current policies at no upfront cost. If we find overcharges, we recover your money. If we don’t find savings, you pay nothing.
Contact us for a free premium audit review and find out if you’ve been overpaying on your workers’ compensation insurance.
Note: Workers’ compensation rules vary by state. The information in this article is general in nature and may not apply to all jurisdictions. This is not legal or insurance advice. Consult with a qualified specialist for guidance specific to your situation.
Last updated: January 2026