Workers' comp and general liability premiums are priced on estimates — your projected payroll and revenue for the year. The premium audit is the carrier coming back to true up the estimate against reality. It's routine. The five-figure surprise bill at the end of it doesn't have to be.
What flags a policy
Growth. If actual payroll or revenue runs well past the estimate on the application, the audit will catch it and bill the difference retroactively — often right when growth already has cash tight.
Class code drift. Workers' comp rates differ enormously by job classification. Office staff coded as field crew (or the reverse) is the single most common — and most expensive — audit finding.
Uninsured subcontractors. Pay a sub who can't produce a certificate of insurance, and the auditor treats their cost as your payroll. A stack of missing certificates converts directly into premium.
Making audits boring
Keep payroll split by class code all year, not reconstructed afterward. Collect a certificate from every subcontractor before they start, not at audit time. Reconcile the estimate mid-term — if the year is running 30% hot, an endorsement now beats a lump-sum true-up later. And when the audit result lands, read it: auditor errors in class codes and included owners are common and disputable.
Where Xel fits
Our clients have an unfair advantage: the payroll records and the insurance brokerage live in the same firm, so class codes stay aligned all year and audit season is a file transfer, not an archaeology dig. A coverage review is the easiest place to start.
What a premium audit actually examines
Workers’ compensation and general liability premiums are estimates until the policy year ends. The carrier then audits actual exposure — payroll by class code, subcontractor payments, sales, or square footage depending on the policy — and issues an additional premium or a refund.
The audit is not an accusation; it is contractual. What determines the outcome is whether your records support the classifications you were rated on. Clean payroll records by class code, certificates of insurance from every subcontractor, and separated overtime typically produce a neutral or favorable audit. Missing documentation produces an assessment.
The five findings that cost the most
Uninsured subcontractors. If a sub cannot produce a valid certificate of insurance for the period they worked, most carriers charge you as if they were your employees. This is the largest single audit adjustment we see.
Misclassified payroll. An office employee rated as field labor — or the reverse — changes the rate dramatically. Job titles are not classifications; duties are.
Overtime not separated. In most states the premium portion of overtime is excludable from the rating base, but only if payroll records break it out.
Owner and officer payroll. Includable or excludable depending on state and entity, and often subject to minimum and maximum payroll limits. Getting this wrong in either direction is common.
Casual labor paid in cash. Undocumented payments are typically assigned to the highest-rated classification on the policy.
How to be ready before the auditor calls
Keep a certificate-of-insurance file with expiration tracking, so no sub ever works past their coverage. Run payroll with class codes assigned at the employee level and overtime separated. Reconcile the general ledger accounts the auditor will ask for — subcontract expense, casual labor, and payroll — before the meeting rather than during it.
Assembling the support behind a premium audit — and pushing back where an assessment looks wrong — is work we take on when an engagement covers it. Coverage itself is reviewed by XA Insurance Services alongside the numbers.
Questions about premium audits
Can we dispute a premium audit result?
Yes. Carriers have a dispute process, and audits are frequently adjusted when classification or subcontractor documentation is produced. The window is limited, so respond quickly rather than paying an invoice that looks wrong.
Does a single uninsured subcontractor really matter?
It can matter a great deal. Payments to an uninsured sub are commonly rated as your own payroll at that trade’s class rate — which is why certificate tracking is worth more than most owners assume.