How the Workers' Comp Audit Works
Standard workers' comp policies are written based on estimated payroll. When your policy starts, you give the carrier your best guess of what you'll pay in wages over the next 12 months. They calculate a premium from that estimate, you pay a deposit and monthly installments, and everyone moves on. Then the year ends.
Within 60-90 days after your policy expires, an auditor contacts you to reconcile the estimate against what you actually paid. If actual payroll exceeded your estimate - which happens constantly in construction - you owe the difference. That bill arrives with no warning and is typically due within 30 days. Contractors who underestimated by $100,000 in payroll can face audit bills of $5,000-$15,000 or more depending on their classification code rates.
What Auditors Actually Look At
A workers' comp auditor typically requests:
- Payroll records - W-2s, quarterly 941s, payroll reports broken out by employee and classification
- 1099s and cash payments to subs - every dollar paid to any individual doing work for you
- Certificates of insurance for every sub - valid ACORD 25 forms with active policy dates
- General ledger or check register - to cross-reference cash payments that might not appear in payroll
- Subcontractor agreements - to understand the nature of the work performed
The audit usually takes one to three hours if your records are organized. If they're not, it can drag out and the auditor fills gaps with worst-case assumptions.
The Uninsured Sub Problem
This is the most expensive audit surprise Florida contractors face. Florida law is clear: if a subcontractor cannot provide proof of workers' comp coverage, their payroll is treated as yours under your policy. The auditor adds it at your classification code rates.
Think about what that means practically. You hired a painting sub for $40,000 of work. They were uninsured. Your policy's painting code might be $8.00/100 of payroll. The auditor adds $3,200 to your audit bill for that one sub. Multiply that across several uninsured subs over a busy year and you're looking at audit bills in the five figures that you had no idea were coming.
| Scenario | Audit Impact | Prevention |
|---|---|---|
| Uninsured sub paid $40,000 | Sub's wages added to your payroll at your code rate - potentially $2,000-$5,000+ extra | Collect valid COI before sub starts work |
| Payroll grew 30% during year | Owe premium on the underestimated wages | Adjust estimated payroll mid-year or use PAYG |
| Office worker doing field work reclassified | Their hours repriced at field rate - often 3-5x the clerical rate | Keep accurate job-by-job time records by classification |
| 1099 sub who looks like an employee | Auditor reclassifies as employee, adds wages to payroll | Independent contractor documentation, separate business, own tools |
Misclassification - The Other Big Trigger
Workers' comp classification codes have very different rates. A clerical worker (code 8810) might cost $0.25/100 of payroll. A roofer (code 5551) might be $30+/100. If you classified a worker as clerical but the auditor determines they were regularly doing field work, their entire payroll gets repriced at the field rate. That reclassification on a single employee can add thousands to your audit bill.
This happens most often with owner-operators who switch between desk work and field work, with small companies where everyone wears multiple hats, and with workers who were promoted from field to office roles mid-year but kept the same classification all year.
How Pay-as-You-Go Eliminates the Audit
The audit exists because standard policies are based on estimates. Pay-as-you-go eliminates the estimate entirely. Premium is calculated on actual wages paid each payroll cycle. When you run payroll, you report actual wages by classification, and the WC premium is pulled from the same run. There's nothing to reconcile at year end because there was never an estimate.
PEO programs don't have traditional year-end audits. Your premium throughout the year was already based on what you actually paid. There's no surprise bill. There's also no deposit to recover - the money flows out proportionally with each payroll instead of in one large lump at the start of the year.
If You Have a Standard Policy Right Now
You can take steps to reduce your audit exposure even on a standard policy. The main ones: collect certificates of insurance from every sub before they start work and re-collect when those certs expire. Keep payroll records organized by employee and by classification code - not just total wages. If your payroll is growing significantly mid-year, call your carrier to adjust the estimate. A mid-year adjustment is annoying but far less painful than a year-end bill.
Frequently Asked Questions - Workers' Comp Audits
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Audit Prep Checklist
COIs for every sub, every job
Payroll by employee and code
All 1099s organized
Quarterly 941s on file
Sub agreements documented
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