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How workers’ comp premium audits work

What the carrier checks, what to gather, and what to do if the numbers look off.

Small business team collaborating in an office

Why did my bill change?

At the start of a policy, your insurer often uses estimated payroll. The audit compares that estimate with your actual payroll, job classifications, and other exposures that apply. Depending on the results and policy terms, you may owe more or receive a return premium.

What should I have ready?

Start with payroll registers, job duties, and any payroll summaries by work type. The carrier may also ask for IRS Form 941, California DE 9 and DE 9C, profit and loss statements, subcontractor invoices, and certificates of insurance. Ask for the exact list for your business.

What if I disagree?

Ask for the audit worksheet. Compare the payroll period, amounts, job classifications, and subcontractor charges with your own records. If something looks wrong, send the carrier the relevant records and ask about its dispute process and deadlines.

WCIRB payroll reporting guide

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