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The Contractor Workers Comp Audit, Explained

By Richard Sweet. Reviewed by Richard Sweet. Updated June 21, 2026.

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For many contractors, the workers comp audit is the most unpleasant surprise of the year. It does not have to be. The bill comes from a few specific, reviewable things.

How the audit works

Workers comp premium starts as an estimate based on projected payroll and class codes. At the end of the policy term, the carrier audits your actual figures: payroll by classification, and how subcontractors were handled. If actual payroll is higher than estimated, or classified into higher-rated codes, the premium rises. The audit is a true-up, not a penalty, but it can produce a real bill.

What drives surprise bills

Three things, mostly. Payroll misclassified into a higher-rated code, or field labor allocated to the wrong trade, inflates the premium. Owner or executive payroll that should be capped or excluded, but was not, adds cost. And uninsured subcontractors, whose own coverage you could not verify, get their payroll charged to your policy. Each is preventable.

How to prepare

Keep clean payroll records broken out by classification, and separate subcontracted labor from your own. Collect and verify each subcontractor’s workers comp certificate before they start, and keep it current. Know how owners and officers are treated in your state. When the audit worksheet arrives, review it against what actually happened before accepting it.

If it is wrong

Audits can be disputed when class codes or payroll were applied incorrectly. The case rests on documentation: accurate payroll records and verified subcontractor coverage. An audit review checks the worksheet against your real operations and helps you correct an overcharge.

The cleanest audit is the one you set up for all year: right codes, honest payroll, verified subs.

Questions to ask your advisor

  • Are my field crews sitting in the right class codes for the work they do?
  • How is my owner or officer payroll treated for audit in my state?
  • Which of my subs still owe me a current, verified workers comp certificate?
  • Does my estimated payroll match what I actually expect to pay this term?
  • If the audit worksheet looks wrong, how do I dispute it and what do I need?

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What many people don't realize

The part that catches owners off guard

  • Premium is estimated, then trued up at audit.
  • Wrong codes and uninsured subs drive surprise bills.
  • Records and verified sub certificates prevent it.
  • The audit is a true-up, not a penalty, but the bill is real.
The Vantage Point

What we see most often

The workers comp audit is where contractors often get blindsided. The bill is generally not random; it usually comes from class codes, payroll allocation, and how subcontractors were handled.

All three are reviewable, and most are preventable with records kept through the year. The cleanest audit is usually the one you set up for long before the worksheet arrives.

A real example

A contractor was charged for a subcontractor's payroll at audit because the sub could not prove its own workers comp coverage. The figures, illustrative, turned a routine true-up into a real bill.

A verified certificate, collected before the work and kept current, would generally have kept that payroll off his policy.

Details changed to protect privacy. Shared to illustrate, not to promise an outcome.

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When to review

It may be time for a coverage review if:

  • You have an audit notice or premium adjustment
  • You use subcontractors
  • Your payroll is not broken out by class code
  • Owner or officer payroll may not be handled correctly
  • Field labor may be sitting in the wrong trade code
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Frequently asked

Frequently asked

Why did my workers comp audit raise my premium?
Usually higher-than-estimated payroll, payroll in the wrong class code, or uninsured subcontractors added to your policy. Each is generally reviewable and largely preventable.
How do I keep subcontractors off my audit?
Collect and verify each sub's own workers comp certificate before they work and keep it current. Uninsured subs can have their payroll charged to your policy.
Can I dispute the audit?
Generally yes, when class codes or payroll were applied incorrectly. Accurate records and verified sub certificates support the correction.
What is the difference between an estimate and an audit?
Premium usually starts as an estimate based on projected payroll and class codes. The audit trues it up against actual figures at the end of the term, which can move the premium up or down.
How are owners and officers handled at audit?
It depends on your state and business structure. Owner or executive payroll may be capped or excluded in some cases, so it is worth confirming how yours is treated before the audit.
What records should I keep for the audit?
Generally, payroll broken out by classification, a separation of subcontracted labor from your own, and verified subcontractor certificates. Clean records usually make the worksheet faster and easier to check.
RS
Written and reviewed by

Richard Sweet

Founder and Principal Advisor, Vantage Point Risk

Richard Sweet runs Vantage Point Risk, an independent insurance and risk advisory for property owners, real estate investors, business owners, and families. He works with investors every week on the coverage decisions that decide how a claim actually turns out, and writes the Learning Center to put those decisions in plain language.

Reviewed for accuracy by Richard Sweet. Last updated June 21, 2026.

Richard also writes The Vantage Point, notes on building a better business.

This article is general information, not insurance, legal, or tax advice. Coverage depends on your policy terms, endorsements, carrier underwriting, and the state you are in. For guidance on your specific situation, talk with a licensed advisor.

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