How to Conduct a Workers' Compensation Insurance Premium Audit
A Workers' Compensation insurance premium audit verifies that your premium reflects your actual payroll and exposure, not just estimates. Joon Lee outlines a repeatable, data-driven process to prepare for the audit, resolve discrepancies, and prevent future overcharges.
- How to Conduct a Workers' Compensation Insurance Premium Audit
- 1. Gather the Right Records Before the Auditor Arrives
- 2. Understand the Audit Scope and Methodology
- 3. Perform a Pre-Audit Internal Reconciliation
- 4. Review the Auditor's Findings and Dispute Errors
- 5. Implement Controls to Prevent Future Audit Surprises
More from this site
Keep reading the latest coverage
1. Gather the Right Records Before the Auditor Arrives
Start by collecting payroll registers, general ledgers, subcontractor certificates of insurance, and job descriptions. For each employee, confirm classification codes match the duties performed, and flag any roles that span multiple codes. Organize records by month so the auditor can trace payroll quickly and you can spot anomalies early.
2. Understand the Audit Scope and Methodology
Determine whether the audit is payroll-based or exposure-based, and confirm the audit period. Insurers typically compare estimated premiums from your policy inception against actual data. Identify the audit duration, the classification system in use, and which adjustments — such as discount credits or surcharge modifications — are in play.
3. Perform a Pre-Audit Internal Reconciliation
Reconcile your estimated payroll against actual payroll by classification code. Calculate your experience modification factor using loss and payroll data, and check for misclassified workers or missing subcontractors. A pre-audit internal reconciliation surfaces errors before the insurer does, giving you a documented basis for dispute.
| Data Point | Source | Purpose |
|---|---|---|
| Payroll by code | Payroll register, GL | Matches actual exposure to classification |
| Subcontractor COIs | Certificates of insurance | Confirms workers are insured elsewhere |
| Job descriptions | HR files | Validates classification code accuracy |
| Loss runs | Carrier or broker | Feeds experience mod calculation |
4. Review the Auditor's Findings and Dispute Errors
Once the auditor presents the results, review every line item. Challenge misclassifications, double-counted payroll, or missing exclusions with documented evidence. If you disagree with a finding, submit a formal dispute in writing, referencing the specific records that support your position, and track the resolution timeline closely.
5. Implement Controls to Prevent Future Audit Surprises
After the audit closes, update job classifications, train payroll staff on code assignment, and reconcile estimates against actuals quarterly. Maintaining clean records throughout the policy year reduces the likelihood of a large premium adjustment at renewal.