A premium audit is a year-end true-up. Your policy starts with estimated payroll and sales, and the carrier later checks your real numbers to set the final premium. If actuals are higher, you can owe more. If your records are messy or your subcontractors cannot prove coverage, you can get a surprise bill. We help contractors set exposures up cleanly, gather the right documents, and keep COIs and endorsements moving so audits stay boring. As ContractorsInsured.net (CA Lic #6015321 / TX Lic #3305690), we help California and Texas contractors prepare for premium audits and keep coverage aligned.
Got an audit notice or an additional premium due letter?
If you are an existing client, use the fast lane and include the audit request from the carrier (PDF or screenshots) so it can be handled accurately.
If you are new to us, start with a quote so we can review your setup and help you avoid the same surprises going forward. We serve contractors in California and Texas, including metros and surrounding areas.
No policy yet but a GC wants a COI? We quote general liability the same business day, bind, and issue the certificate right after. Already covered? Send the certificate holder details and endorsement wording and we match it.
What a premium audit is (plain English)
Most contractor policies are issued using estimated figures at the beginning of the term, such as:
- Payroll (especially for workers compensation)
- Gross sales or receipts (common for general liability)
- Subcontractor costs (often important for both)
At the end of the term, or sometimes mid-term, the carrier audits your records. If actual figures are higher than estimated, you may owe additional premium. If they are lower, you may receive a return premium, depending on the policy and any minimum premiums.
Why insurers audit contractor policies
Audits help carriers confirm:
- Your payroll by class code and job duties is accurate
- Your sales and receipts match the exposure the policy was priced on
- Your subcontractor costs are properly handled, especially if subs did not carry their own coverage
- Your work mix and risk profile are consistent with what was represented
What gets audited (workers comp vs general liability)
Workers compensation audits (most common for contractors)
Typical focus areas:
- Total payroll for the policy period
- Payroll split by class code and job duties
- Owner or officer inclusion or exclusion (varies by rules and elections)
- Overtime handling (rules vary by carrier and state)
Start here for the workers comp basics: workers comp for contractors and contractor class codes.
General liability audits
Typical focus areas:
- Gross sales and receipts for the policy period
- Type of work performed (scope and job mix)
- Subcontractor costs and certificates (a common audit question)
Overview: general liability for contractors.
Documents that usually matter (audit checklist)
Have these ready. Best effort is fine, and you can improve your records over time.
Payroll and tax support (workers comp heavy)
- Payroll register(s) for the policy period
- Quarterly payroll tax filings (often requested)
- W-2 summaries and payroll reports
- Breakdown of wages by role if you have mixed duties
- Overtime reports if applicable
Financials (often used for GL and cross-checks)
- Profit and loss statement for the policy period
- General ledger summary (if available)
- Total gross receipts or sales support
Subcontractor documentation (a common contractor pain point)
- Subcontractor invoices and totals
- Subcontractor COIs and workers comp proof, organized by vendor
- Written subcontract agreements (if you have them)
Need a system for subcontractor proof? See subcontractor insurance compliance and the certificate of insurance guide.
How to avoid surprise audit bills (simple rules that work)
- Track payroll by job duty, not just by person. If one employee does multiple types of work, track hours by role when possible. Cleaner splits reduce disputes over class codes.
- Keep subcontractor COIs and workers comp proof in one place. If a sub cannot prove coverage, the carrier may treat those costs as your exposure.
- Update estimates during the year. If payroll or sales are climbing, update your broker during the term. Smaller adjustments beat one big surprise at audit.
- Do not ignore audit requests. Non-response can lead to estimated audits, penalties, and larger bills.
- Know your class codes. Misclassification can increase premium and trigger reclassification at audit. See the class codes guide.
Common mistakes that increase the audit premium
- Missing subcontractor proof (COIs not collected, expired, or not matching the job period)
- Payroll not separated by duties (everyone treated as the highest-risk role)
- Incorrect or inconsistent class codes, especially when job mix changes mid-year
- Not reporting growth (payroll and sales estimates far below actuals)
- Messy recordkeeping (numbers do not tie to tax filings or payroll reports)
- Waiting until the deadline (rush audits lead to mistakes and defaults)
Mini definitions (fast and extractable)
- Premium audit: A reconciliation of estimated exposures versus actual exposures for the policy term.
- Class code: A category that describes job duties for rating, especially in workers comp.
- COI: Proof of coverage and limits on a date. It does not rewrite the policy.
- Additional Insured (AI): Usually granted by endorsement, not created by a COI checkbox.
- Primary and Noncontributory (PNC): A contract requirement about priority of coverage.
- Waiver of Subrogation (WOS): A contract requirement that may waive certain recovery rights when endorsed.
How we help contractors handle audits (and prevent repeat surprises)
ContractorsInsured.net is an independent broker built for contractors. We help by:
- Reviewing your exposure setup (payroll, class codes, subs, job mix)
- Helping you assemble the documents carriers typically ask for
- Keeping compliance needs moving (COIs, endorsements, policy docs) so you can stay focused on the job
Start here: get a quote, request a COI, or browse the contractor compliance hub.