Industry
Commercial insurance premium audit: what happens after the policy year ends
How a commercial insurance premium audit runs after the policy ends, from the audit notice through payroll and sales classification to the final billing adjustment.
What to take away
- The premium audit replaces the estimate from your application with actual payroll, sales, or unit counts, and it sets the final premium after the policy period closes.
- Workers compensation audits classify payroll by class code, while general liability audits usually classify sales receipts by state and operation.
- Auditors work from your own recordsquarterly 941s, state wage reports, sales tax filings, and the general ledger.
- You can challenge a classification or an exposure, but only with documents and inside the carrier's review window.
- Most large additional premiums trace to subcontractor payroll, misclassified office staff, or sales in states you never disclosed.
How the audit notice becomes a final bill
The notice arrives by mail or email, sometimes weeks after expiration and sometimes months later. It names the auditor, lists the records requested, and sets a deadline that is often two to four weeks out.
Smaller policies are usually handled through a voluntary audit by phone or portal. Larger or higher hazard risks get a physical audit at your office.
Estimated premium and final premium are separate numbers. Only the final one reflects what you actually ran during the year.
Premium audit response steps
- Read notice, note deadline and records
- Send payroll and receipts split by class
- Walk auditor through payroll division
- Review completed worksheet before file closes
- Reconcile final billing against worksheet
If you do not respond, the carrier can bill the exposure it estimated and may apply a penalty allowed by the policy terms.
Workers compensation audit payroll: class codes and officer pay
Workers compensation is rated per $100 of payroll, and each dollar has to land in a class code. Clerical staff in a separate office usually qualify for a lower rated class than field crews.
Workers comp payroll classification
Clerical office staff
- Class code
- Lower rated
- Overtime
- State rules apply
- Records needed
- Payroll by class
Field crews
- Class code
- Higher rated
- Overtime
- State rules apply
- Records needed
- Payroll by class
Subcontractors without COI
- Class code
- Charged as employees
- Overtime
- Not applicable
- Records needed
- Certificates of insurance
Owners and officers
- Class code
- Included or excluded
- Overtime
- Not applicable
- Records needed
- Ownership percentage
Overtime follows state rules. Some states let you exclude the premium portion of overtime pay, and others do not. That is why auditors ask for overtime broken out by employee.
Subcontractors who have no certificate of insurance on file are charged to you as though they were your own employees.
Owners and officers are included or excluded based on ownership percentage, state rules, and whether they elected coverage.
General liability audit sales receipts and state splits
General liability on a receipts basis multiplies audited sales by a rate per $1,000. The auditor wants sales by state and by operation, because rates change with territory and class.
Audit records by policy line
Workers compensation
- Exposure basis
- Payroll by class code
- Records requested
- 941s, state wage reports, overtime detail
General liability
- Exposure basis
- Receipts or payroll
- Records requested
- Sales tax returns, profit and loss statement
Commercial auto
- Exposure basis
- Vehicles, radius, garaging
- Records requested
- Vehicle schedule, driver list
Employment practices
- Exposure basis
- Employee counts and payroll
- Records requested
- Payroll register, headcount by state
The overview of general liability insurance describes the coverage and the exclusions that sit in nearly every form.
Receipts only measure the exposure the policy insures, so classification follows the work rather than the invoice. Before you argue about a sales figure, it helps to know what counts as third party, because a claim that fails that test never reaches the policy.
Some classes are rated on payroll, units, or square footage instead of receipts.
| Policy line | Exposure basis | Records the auditor asks for |
|---|---|---|
| Workers compensation | Payroll by class code | 941s, state wage reports, overtime detail |
| General liability | Receipts or payroll by class | Sales tax returns, profit and loss statement |
| Commercial auto | Vehicles, radius, garaging | Vehicle schedule, driver list |
| Employment practices | Employee counts and payroll | Payroll register, headcount by state |
Example: a payroll shortfall that arrives as a bill
A landscaping contractor estimated $150,000 in payroll at renewal. Crews grew during the year, and the audited payroll came back at $210,000.
The extra $60,000 is charged at the class rate, and the carrier issues an additional premium notice. The deposit was based on the smaller estimate, so the bill lands after the work is finished.
The quote sets the deposit. The audit sets the premium you actually owed.
Other policies that ride on the same audited figures
Audited payroll and revenue do not stay inside workers compensation and general liability. Employment practices liability is rated on employee counts and payroll, so a reclassification of staff changes that line too.
Directors and officers liability for private companies is often priced from revenue, total assets, and balance sheet items the audit touches.
Professional services firms split payroll between technical and clerical staff, and their coverage turns on a claim date rather than an accident date. Knowing the date that decides it prevents a reporting gap at renewal.
Audit dispute commercial insurance: what a challenge needs
A dispute starts with the worksheet, not with the invoice. Ask the carrier or the audit vendor for the completed worksheet before you pay anything.
- Request the class code assignment in writing, with the rate attached to each code.
- Compare every state total and class code against your own payroll and sales records.
- Pull certificates of insurance for any subcontractor charged to your payroll.
- Send the challenge in writing inside the carrier's review window and keep a dated copy.
If the carrier will not move, workers compensation disputes can go to the state rating bureau or the insurance department. General liability disputes follow the carrier's internal appeal steps.
