Every year, contractors open an envelope — or an email — announcing a premium audit, and every year some of them end up with a surprise bill that wrecks a quarter’s cash flow. General liability and workers’ compensation policies for contractors are priced on estimates of payroll, subcontractor costs, and sales made at the start of the term. The audit is where the carrier checks those estimates against reality and settles the difference — in either direction.
The contractors who sail through audits aren’t lucky. They keep records a particular way all year long. Here’s how the process works and how to come out of it paying only what you genuinely owe.
What the Auditor Is Actually Looking At
For workers’ comp, the auditor wants payroll by employee, broken down by class code, plus overtime detail — the premium portion of overtime is often excludable, but only if your records separate it. For general liability, the focus is typically gross sales, payroll, and what you paid subcontractors. Expect to provide payroll journals, quarterly tax filings, a general ledger or job-cost reports, and certificates of insurance for every subcontractor you paid during the term.
The Subcontractor Certificate Problem
Nothing generates audit pain like missing subcontractor certificates. If you can’t produce a certificate showing a sub carried their own coverage during the time they worked for you, the auditor typically treats what you paid them as your payroll and charges premium on it — at your rates. The fix is procedural: collect a current certificate before a sub starts, calendar the expiration dates, and keep the certificates with the job file. Collecting them in a panic after the audit notice arrives rarely goes well, because subs who’ve moved on have little incentive to help.
Class Codes: Where Money Quietly Leaks
Contractor payroll often spans multiple classifications — carpentry, concrete, supervision, clerical. If your records don’t split an employee’s hours by the work performed, the rules generally push all of that payroll into the highest-rated code that applies. A working foreman whose time is documented between field work and supervision may be rated differently than one whose time isn’t documented at all. Set up your payroll system to track hours by class code and job from the first week of the policy year.
Owners, Officers, and Excluded Payroll
States set minimum and maximum payroll amounts for owners and officers, and allow certain exclusions or elections that change what counts. Per diem, reimbursed expenses with receipts, severance, and some fringe benefits are often excludable too. These adjustments rarely happen automatically — they happen when your records make them visible. A pre-audit review with your agent can identify exclusions you’re entitled to before the auditor closes the file.
During the Audit: Cooperate, Don’t Volunteer Chaos
Respond by the deadline — ignored audits typically result in estimated audits, which are almost always worse, and can lead to cancellation or collections. Provide exactly what’s requested, organized clearly. Designate one person to answer questions. If the auditor works from your ledger, be ready to explain entries like casual labor or materials-plus-labor invoices, which can otherwise get swept into chargeable payroll.
Disputing an Audit You Think Is Wrong
Audit results can be disputed, and errors are not rare — misapplied class codes, subs charged despite valid certificates, overtime premium not backed out. Review the audit worksheets line by line, or have your agent do it. Most carriers have a formal dispute window; missing it converts a fixable error into a permanent one. Keep paying undisputed amounts while the disputed portion is reviewed to avoid cancellation for nonpayment.
Make Next Year’s Audit Boring
The goal is an audit with no surprises in either direction — which also means your estimates, and your cash flow, were right all year. An independent agent can help you set realistic payroll and sales estimates at renewal, review your class codes, set up a certificate-tracking routine, and sit with you through a pre-audit check. If your last audit produced a bill you didn’t expect, that’s worth a conversation before the next policy term starts.