# Commercial Insurance Premium Audits: Why Your Business Gets a True-Up Bill
If you run a business with workers' compensation or general liability coverage, you may get a bill (or a refund) *after* your policy term ends called a premium audit adjustment. It surprises a lot of owners, but it's a normal, built-in part of how commercial insurance is priced. Understanding it helps you avoid a nasty year-end surprise. Here's how audits work for small businesses across our seven-state footprint.
Why Commercial Policies Get Audited
Many commercial policies — especially workers' compensation and general liability — are priced on estimates you provide at the start of the term: your projected payroll, sales/receipts, or subcontractor costs. Because your actual numbers won't be known until the year is over, the carrier charges an estimated premium up front, then performs an audit at the end to compare estimate to reality.
- If your actual payroll or sales were higher than estimated, you owe additional premium (a bill).
- If they were lower, you get a refund or credit.
The audit "trues up" the premium so you pay for the risk you actually had — no more, no less.
What Gets Audited
The exposure base depends on the policy:
- Workers' compensation is usually rated on payroll, often split by job classification (a roofer's payroll rates very differently from an office worker's).
- General liability is commonly rated on gross sales/receipts, and sometimes payroll or square footage, depending on the class of business.
- Subcontractor costs matter too — uninsured subs can be added to your exposure if they lacked their own coverage.
Auditors typically review payroll records, tax filings (like state unemployment reports), profit-and-loss statements, and certificates of insurance from your subcontractors.
Types of Audits
- Physical audit — an auditor visits or reviews your records in detail. Common for larger or higher-risk accounts.
- Mail/voluntary audit — you complete a form reporting your actual figures and submit documentation.
- Phone audit — you provide figures over a call.
Whatever the type, cooperation is required. Ignoring an audit request can lead to an estimated audit at the carrier's discretion (often unfavorable) or even cancellation.
How to Avoid an Audit Surprise
The best defense is accurate estimates and clean records:
- Estimate honestly at renewal. Lowballing payroll or sales to get a cheaper up-front premium just guarantees a big audit bill later.
- Keep good records — payroll by class code, sales figures, and a P&L that ties out.
- Collect certificates of insurance from every subcontractor. An uninsured sub can land on *your* audit as added payroll or exposure.
- Separate payroll by job duty where allowed, so lower-risk work isn't rated at high-risk rates.
- Tell us mid-year if things change. If payroll or sales jump, we can adjust your estimate so the true-up isn't a shock.
What If You Disagree With the Audit?
Audits aren't always perfect. If a bill looks wrong:
- Request the audit worksheet to see how the number was built.
- Check the class codes — misclassified payroll is a common error that inflates premium.
- Confirm subcontractors were credited for their own valid coverage.
- Dispute it with supporting records. Carriers can revise an audit when you show documentation, and each state's Department of Insurance oversees fair commercial billing practices.
We help clients review and dispute audits regularly — misclassification alone can move a bill significantly.
Plan for the Cash-Flow Impact
Because an additional-premium audit bill can arrive as a lump sum, smart owners set aside a cushion during the year, especially if business grew faster than the estimate. If an audit bill is large, ask about payment arrangements — carriers will often spread it out.
How BNW Helps
Premium audits are one of the most confusing parts of commercial insurance, and mistakes cost real money. As your independent agent, we help you set accurate estimates, keep audit-ready records, review the final worksheet, and dispute errors like misclassified payroll. Call or text Lucy, our AI receptionist, at (573) 594-5148, or reach us at insuretoday24.com.
References
1. National Association of Insurance Commissioners — https://www.naic.org
2. Insurance Information Institute — https://www.iii.org
3. Investopedia: Insurance Premium Audit — https://www.investopedia.com/terms/p/premium.asp
4. Missouri Department of Commerce & Insurance — https://insurance.mo.gov
5. Kansas Insurance Department — https://insurance.kansas.gov
Related
- How Insurance Billing Works: Premiums, Down Payments and Fees
- Understanding Your Insurance Bill: Taxes, Fees and Surcharges
- Workers' Compensation Insurance in Missouri
- General Liability Insurance for Small Business
- Business Owners Policy (BOP): Coverage in One Package
Watch
- How workers comp premium audits work — Investopedia (youtube.com/@Investopedia); search: "workers compensation premium audit explained small business"
- Avoiding a big audit bill — NerdWallet (youtube.com/@NerdWallet); search: "general liability premium audit small business explained"