Overview
When contractors request price bids for a job, they're often asked to guarantee that the bid is firm and that there will be no cost overruns. Insurance works differently: premiums for key commercial coverages such as Workers' Compensation and General Liability are usually based on estimates made before the policy period, and final premiums are set after the policy period when actual figures are available.
That final adjustment typically happens after an insurance company performs an audit to verify payrolls, sales, or other exposure bases used to calculate the premium. The result of the audit can be a refund if the initial estimate was too high, or an additional premium bill if the estimate was too low.
Key takeaways
- Workers' Compensation and some liability premiums are estimated and finalized after an audit.
- An audit reconciles actual payrolls, receipts, or subcontractor usage with the insurer’s estimates.
- Preparing records and understanding classifications can reduce surprises at audit time.
How it works
Insurers estimate your premium when they issue a policy because they must set a charge before the policy period starts. These estimates are based on anticipated payroll, revenues, and classifications of employees or operations.
After the policy expires, the insurer audits the business to determine the actual exposure bases. If the audit shows lower exposures than estimated, the insurer issues a refund; if it shows higher exposures, you receive a bill for the additional premium. For details on how payroll audits are conducted and what auditors look for, see Understanding Workers' Compensation Audits.
What it may cover (and what it may not)
Workers' Compensation typically covers employee payroll exposures and pays benefits for work-related injuries. General Liability premiums are often based on sales or subcontracted work for certain operations.
Policies do not usually cover costs that are excluded by the contract language—such as penalties, fines, or employee benefits not listed in the policy—or exposure bases that were not disclosed. If you want a broader look at audit-related insurance topics, consult Audit Insurance.
Common mistakes to avoid
Failing to keep organized payroll and subcontractor records is a frequent cause of unexpected audit results. Without clear documentation, audits can overstate exposures or delay finalization.
Misclassifying employees, overlooking seasonal labor, or not reporting changes in operations during the policy period can also lead to higher-than-expected premiums after audit.
Questions to ask an agent
Ask how the insurer estimates premiums and what information they use to set initial figures.
Request clarification on which payroll categories, subcontractor payments, or receipts will be audited and what records you should keep to support the reported figures.
Ask about available classification codes and whether your operations qualify for any special classifications or credits that could lower your exposure.
Next steps
Keep clean, timely payroll and subcontractor records throughout the policy period, and document any operational changes so they can be reported promptly.
If you have concerns about an upcoming audit or want guidance preparing records, ask an agent for specific advice and assistance.
Frequently Asked Questions
Why do insurers estimate premiums instead of charging a fixed amount?
Because payrolls, sales, and other exposure bases that determine premiums are often unknown until the policy period ends, insurers use estimates and reconcile later through an audit.
When will I receive the final premium after my policy ends?
Final premium is determined after the insurer completes an audit, which usually takes place shortly after the policy term ends and your records are reviewed.
What records should I keep to avoid surprises at audit?
Maintain detailed payroll records, subcontractor invoices, certificates of insurance, and documentation of any operational changes during the policy period.
Can I dispute the audit results?
Yes, you can ask the insurer to review or explain findings and provide additional documentation if you believe the audit overstated your exposures.