A workers compensation premium audit compares the policy's estimated exposure with actual operations during the policy term. Preparation should begin before the auditor requests records. A clean file helps the business explain payroll changes, classification differences, new locations, overtime treatment, and subcontractor work without recreating a year of activity under deadline.
Reconcile the audit period
Confirm the policy effective and expiration dates, legal entities, locations, and states. Export payroll by employee and pay period for exactly that interval. Reconcile totals to quarterly payroll reports, general ledger wage accounts, and tax filings. Document acquisitions, closures, ownership changes, or short policy periods that make annual reports misleading.
Keep a bridge explaining every difference between payroll-system totals and financial statements. Do not delete unusual items; label them and ask the auditor how they should be treated.
Organize payroll by work actually performed
Prepare employee names, job duties, work locations, departments, and payroll. Classification is based on applicable rules and operations, not simply job titles. Flag employees who changed roles during the year and preserve effective dates. Separate overtime premium, tips, bonuses, severance, and other pay elements so the auditor can determine treatment under the applicable rules.
| File | Control total | Explanation needed |
|---|---|---|
| Payroll detail | Gross payroll by period | Role or location changes |
| Quarterly tax reports | Taxable wages | Timing and excluded items |
| General ledger | Wage and contract labor accounts | Reclasses and accruals |
| Employee roster | Headcount by location | Owners and excluded persons |
Build the subcontractor evidence file
List every subcontractor or independent business paid during the period. Keep contracts, invoices, scope descriptions, payment totals, and certificates covering the dates of work. A certificate alone does not decide employment status or audit treatment, but missing evidence can make review harder and may affect premium under applicable rules.
Separate labor from materials where invoices support the distinction. Identify uninsured contractors early and ask the licensed agent or auditor what documentation is required. Do not create retroactive certificates or alter dates.
Run a pre-audit exception review
- New states, locations, or operations not shown at policy inception.
- Large payroll movement compared with the estimate.
- Employees assigned to more than one function.
- Contract labor posted to inconsistent accounts.
- Missing certificates or gaps in policy dates.
- Claims or injury records that conflict with the roster.
Send records through the auditor's approved secure method and retain a copy of the submission. After the audit, compare final exposures and classifications with your reconciliation before accepting the adjustment or asking a documented question.
Close the audit with a reproducible record
Save the auditor's request, every file transmitted, explanatory notes, the final worksheet, and the resulting endorsement or invoice. Compare audited payroll and classifications with the next renewal estimate so the same variance is not repeated. If the result appears inconsistent, ask a specific written question tied to the submitted evidence instead of disputing only the amount. The objective is a traceable calculation that another reviewer can reconstruct from the retained file.
Verification record to keep
Reconcile one month from the payroll register to the general ledger and the employee classification worksheet. Have a second person trace overtime treatment, multiple-state work, officer payroll, and one subcontractor payment to supporting records. Record unexplained differences instead of forcing totals to match. The audit package should show the source and review date for each number.
After the carrier audit, compare audited exposures and classifications with the submitted reconciliation. Log each adjustment, the supporting explanation, and whether the next policy estimate needs to change. Preserve the auditor request, files transmitted, secure-delivery receipt, final worksheet, and resulting endorsement or invoice so a future reviewer can reproduce the calculation.
Primary references
These official resources establish the general planning framework. Policy documents and applicable state rules control a specific decision.