Contractor Insurance You Can Trust
Workers Comp Audits — What to Expect
Year-end audits determine your final premium for the policy year — understanding how they work prevents expensive surprises.
- ✓Audits compare actual payroll to estimated payroll at inception
- ✓Class code reclassification is a common audit finding
- ✓1099 subs without their own coverage can be added to your payroll
- ✓Pay-as-you-go billing largely eliminates payroll audit surprises
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✓ Same-Day COI
✓ Licensed All 50 States
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Why Carriers Conduct Annual Audits
Workers compensation premiums are based on estimated payroll at the start of the policy year. Since payroll can change significantly — seasonal hires, growth, slowdowns, turnover — the carrier cannot know your actual exposure at inception. The audit reconciles estimated premium against actual premium.
If your actual payroll exceeded the estimate, you owe additional premium. If it came in below the estimate, you receive a refund or credit. The audit is not punitive — it’s a true-up of what you actually owed for the year.
For most contractors, the audit is straightforward. For those who had a dramatically different year than expected — big growth, unexpected slowdowns, large subcontractor costs — the audit can produce a significant billing.
What Auditors Look At
The primary audit items are: total payroll by employee, the job duties performed by each employee (to verify class code accuracy), payments to subcontractors, and documentation of subcontractor insurance certificates.
Subcontractor costs are a major audit focus for contractors. If you paid a subcontractor who couldn’t provide a valid workers comp certificate, many states allow the carrier to include that subcontractor’s labor cost in your audited payroll — effectively charging you workers comp premium on work they did for you.
Auditors also look for employees who may have been misclassified. A worker coded as a drywaller who was actually doing roofing work will be reclassified to the roofing code for the period they performed that work, generating an additional charge.
How to Prepare for Your Audit
Start by pulling together your payroll records for the policy period — ideally organized by employee and by class code. If you use a payroll service, most provide a year-end payroll summary by employee that auditors accept directly.
Gather all certificates of insurance from subcontractors paid during the year. Organize them by sub and verify that the coverage dates match the periods when the sub worked for you. Expired certificates or missing certificates generate audit charges.
If any employees performed multiple job functions, document the time allocation. A written record of hours by job type — even a simple spreadsheet — gives you the ability to negotiate a split classification rather than having the auditor assign all time to the highest-rated code.
Disputing an Audit Result
If your audit produces charges you believe are incorrect — misclassified employees, uninsured sub charges for subs who actually had coverage, or payroll figures that don’t match your records — you have the right to dispute.
Contact your carrier’s audit department in writing within 30 days of receiving the audit bill. Provide supporting documentation: payroll records, class code justification, sub certificates. Most carriers have a formal audit dispute process and will assign a supervisor to review your case.
Your agent should be part of this process. A good independent agent will advocate on your behalf with the carrier’s underwriting and audit departments, drawing on their relationship and knowledge of the carrier’s process to resolve disputes faster.
If the carrier upholds the audit and you still believe it’s wrong, you can request a final review by NCCI or your state’s rating bureau. This is the last formal step before legal remedies.
Avoiding Audit Surprises Going Forward
The most effective prevention is accurate payroll estimation at inception. Over-estimating ties up your cash; under-estimating creates a balloon audit payment. If you can, estimate conservatively on the high side and collect the refund — rather than under-estimate and face an audit bill.
Collect sub certificates before work starts — not afterward. Make it a condition of hire that every sub provides a valid COI before stepping on your job site. A certificate coordinator or administrative system for tracking certificate expiration dates pays for itself at audit.
Consider pay-as-you-go billing if your payroll fluctuates significantly. It eliminates the payroll audit discrepancy entirely by calculating premium on actual payroll in real time.
Why Contractors Use Trade Safe Insurance
Independent Agency
We compare dozens of carriers to find the best rate and form for your trade, payroll, and claims history.
Same-Day COI
Certificates issued the same day — often within the hour — so no job site delays waiting for paperwork.
Hard-to-Place Welcome
High EMR, prior claims, or specialty trades? We work in non-admitted markets where others stop.
20+ Years Experience
Decades of placing contractor workers comp means we know the class codes, carriers, and audit traps to avoid.
Frequently Asked Questions
Can I dispute a workers comp audit? +
Yes. Contact the carrier’s audit department in writing within 30 days with supporting documentation. Your agent should assist with the dispute.
What happens if I don’t respond to the audit? +
The carrier will estimate your payroll based on your last policy year and bill you for the estimated difference. Unresponsive accounts often receive inflated estimates.
Why was a subcontractor added to my audit payroll? +
If a sub couldn’t provide a valid workers comp certificate, your carrier may treat their labor cost as your payroll and charge premium on it.
How far back can an auditor go? +
Audits cover only the policy period — typically one year. But if fraud or intentional misrepresentation is found, carriers can rescind the policy entirely.
What records do I need for a workers comp audit? +
Payroll records by employee, certificates of insurance for all subcontractors, job descriptions or time records for employees doing multiple types of work.
How soon after the policy ends does the audit happen? +
Most carriers initiate the audit within 30-60 days of policy expiration. Physical audits may take a few months; mail audits are typically faster.
Never Get Hit with a Surprise Audit Bill Again
We set up accurate classifications and pay-as-you-go billing from day one — so your audit is a formality, not a financial emergency.