Construction companies often dread their annual Workers’ Compensation audit—and for good reason. A poorly prepared audit can result in thousands of dollars in additional insurance premiums, delayed policy renewals, and disputes with your insurance carrier.

The good news is that most audit problems are preventable.

This Workers’ Compensation Audit Checklist will help contractors organize their records, correctly classify employees, and prepare for a successful audit.

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What Is a Workers’ Compensation Audit?

A Workers’ Compensation audit is an annual review performed by your insurance company to verify that the payroll estimates used to calculate your premium match your company’s actual payroll and operations during the policy period.

Because construction payroll often changes throughout the year, insurers use audits to determine whether you owe additional premium or qualify for a refund.

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Workers’ Comp Audit Checklist

✅ Payroll Reports

Gather complete payroll reports for the policy period, including:

• Payroll summaries
• Employee earnings
• Overtime reports
• Bonus payments
• Vacation pay
• Sick pay

Your auditor will compare payroll records against tax filings.

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✅ Quarterly Payroll Tax Returns

Prepare copies of:

• IRS Form 941
• State unemployment reports
• State payroll tax filings

These documents help verify payroll accuracy.

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✅ Employee Job Classifications

Review every employee’s job duties.

Examples include:

• Office Staff
• Bookkeepers
• Estimators
• Carpenters
• Roofers
• Electricians
• Concrete Workers
• Project Managers
• Foremen

Employees performing multiple duties should have accurate payroll allocations whenever permitted by state rules.

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✅ Separate Clerical Payroll

One of the biggest audit mistakes is failing to separate office employees from field employees.

Office personnel generally have much lower Workers’ Compensation rates than construction workers.

Examples include:

• Receptionists
• Administrative assistants
• Payroll staff
• Human Resources
• Accounting

Proper payroll separation can significantly reduce insurance premiums.

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✅ Overtime Records

Maintain detailed overtime reports.

In many states, the premium portion of overtime pay can be excluded from Workers’ Compensation calculations if documented correctly.

Without proper records, insurers may include all overtime wages.

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✅ Certificates of Insurance (COIs) for Subcontractors

Collect a valid Workers’ Compensation Certificate of Insurance from every subcontractor before work begins.

Keep certificates current throughout the project.

If a subcontractor has no Workers’ Compensation coverage, your insurer may charge premium on the subcontractor’s labor costs.

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✅ Independent Contractor Documentation

Maintain:

• Signed contracts
• W-9 forms
• 1099 records
• Certificates of Insurance
• Business licenses

Simply issuing a Form 1099 does not automatically make someone an independent contractor for insurance purposes.

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✅ Owner Exemption Forms

If owners are exempt from Workers’ Compensation coverage, maintain copies of:

• State exemption certificates
• Corporate filings
• Ownership records

Missing documentation may increase your premium.

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✅ General Ledger

Your auditor may compare payroll records against the company’s General Ledger to verify labor expenses.

Ensure labor accounts reconcile with payroll records.

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✅ Employee Timecards

Detailed time records help support proper employee classifications.

Timecards are especially valuable when employees perform multiple job duties.

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Red Flags That Trigger Higher Premiums

Watch for these common issues:

• Missing subcontractor certificates
• Payroll inconsistencies
• Cash labor
• Poor employee classifications
• Missing payroll records
• Incorrect overtime reporting
• Uninsured subcontractors

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Workers’ Compensation Audit Preparation Timeline

30 Days Before the Audit

• Review payroll records
• Collect subcontractor certificates
• Verify classifications
• Organize financial records

One Week Before

• Meet with your CPA or insurance agent
• Review payroll totals
• Prepare audit binder

Audit Day

Have available:

• Payroll reports
• Tax returns
• Certificates of Insurance
• Employee records
• General Ledger
• Financial statements

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Frequently Asked Questions

What happens if payroll increased during the year?

If actual payroll exceeds estimated payroll, you’ll generally owe additional premium.

Can I challenge an audit?

Yes. Contractors can dispute employee classifications, payroll calculations, and subcontractor determinations if supporting documentation is available.

How long should I keep audit records?

Most contractors should retain payroll, tax, and insurance records for at least five to seven years.

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Final Thoughts

Preparing for a Workers’ Compensation audit isn’t just about satisfying your insurance company—it’s about protecting your bottom line. Contractors who maintain organized payroll records, properly classify employees, and collect Certificates of Insurance from subcontractors are far less likely to face unexpected premium increases.

Treat your audit as an annual financial review, and you’ll be better positioned to control insurance costs and keep your construction business compliant.