Premium Audit 101: A Quick Guide

A premium audit is your insurance carrier's end-of-policy reconciliation: the premium you've been paying was an estimate built on projected payroll and job classifications, and the audit replaces the estimate with your actual figures. Below are the questions we hear most, answered plainly.

Why audits happen

Why do I get audited every year? Did I do something wrong?

Generally, if you pay over $10K in workers' comp insurance premiums, an audit is required every year (either physical — meaning the auditor examines your original records — or virtual). It does not mean you did anything wrong. Carriers are obligated to do this to meet regulatory requirements and keep their underwriting license. In California, for example, the state's rating plan requires a physical audit at least once a year for every policy producing a final premium of $10,500 or more (WCIRB, Physical Audit Requirements).

For businesses paying less than $10K in premiums, carriers commonly opt for a voluntary audit, or self-reporting. It's an online form you complete that asks you to input individual employees, class codes, and actual payroll during the policy term.

I switched insurance companies. Why is my former carrier still calling me for an audit?

Your insurance carrier estimates your premium at the start of the policy period based on projected payroll and job classifications. The audit reconciles that estimate against actual payroll and class codes. Not renewing doesn't mean they no longer need actual figures.

An extreme example: if you submitted a $10K payroll estimate but your actual payroll was $100K, you only paid the carrier based on $10K — at $100K payroll, you have 10x the exposure of the estimate. Carriers are entitled to that additional premium.

The audit process

How long will the audit process take from start to finish?

Most audits move faster than people expect once documents are in order — the real variable is how quickly records get assembled on your end. For a small business operating in 1–2 states with 20 employees and a few class codes, the most experienced auditors can complete the process within the hour.

Will the auditor visit my office in person or conduct a remote audit?

Carriers use both physical and virtual/phone audits depending on your policy size and their internal criteria — it's not something you get to choose upfront in most cases. COVID shifted many physical audits to virtual — many carriers no longer require in-person audits. Some have moved almost entirely to remote/virtual audits.

What specific records and documents do I need to prepare?

At minimum: payroll summary report (preferably in Excel), your federal (Form 941) and state quarterly tax returns, a general ledger, and certificates of insurance for any subcontractors. Certain states like California have extra requirements — e.g., California Dual Wage construction contractors need to present time card samples or a Collective Bargaining Agreement (CBA) to qualify for lower-rated dual wage codes.

Reach out to us if you need help preparing for an audit. We can communicate with your accountant, CPA, or payroll company.

Who from my company needs to be available during the audit?

Auditors commonly deal with payroll managers, controllers, and accountants for records — but for the actual interview, the best person is someone knowledgeable about business operations and employees' roles. Often that's the HR Manager or Operations Manager. Many auditors review the payroll info before scheduling the "exit interview," which covers business operations and employee classifications. A payroll manager or accountant often isn't the best fit for that conversation — they tend to answer based on guesses and give a different account than the operations person would, which is a common source of disputes.

Auditors often refer to this step as the "exit interview." They are usually not looking to meet with your accountant to validate payroll or tax documents. Their real goal is to verify business operations and dig into employees' job duties to determine whether the workers' comp classifications are accurate.

Payroll and classifications

How do I separate payroll for employees with different job duties?

With the exception of Standard Exception Classifications, payroll can be split across class codes only when duties, time, and pay are clearly documented separately. If that documentation isn't available, the auditor will assign all payroll to the highest-rated class code, which is one of the most common ways businesses end up overpaying.

What are Standard Exception Classifications?

Standard Exception Classifications are workers' compensation class codes that apply to employees whose duties are strictly clerical or administrative — not part of the company's core operations. Because these roles are narrowly defined, their payroll cannot be split with other class codes.

Common Standard Exception class codes:

• 8810 — Clerical Office Employees
• 8742 — Outside Sales
• 8871 — Telecommuting Clerical
• 7380 — Drivers, Chauffeurs, Messengers, and Their Helpers NOC

These classifications come with strict rules. If an employee in a Standard Exception role performs duties outside the definition — even occasionally — auditors may reassign all payroll to a higher-rated operational code. Clear job descriptions and consistent duties are essential to avoid costly reclassification.

One of the most frequent errors PremiumAudit.ai identifies is Standard Exception employees being misclassified into the governing classification of the business — a mistake that often leads to unnecessary premium charges.

Are bonuses, commissions, and overtime included in gross payroll?

Some of these are included in full, some get a partial exclusion, and the rules aren't the same everywhere. Reach out to us to double-check and maximize your deductions.

How are officer, owner, or partner earnings handled during the audit?

Officers, owners, and partners are often subject to different payroll caps or exclusion rules than regular employees. Worth having us check before you accept the auditor's number.

What happens if an employee's job classification is wrong?

A misclassified employee can shift real money onto your bill, sometimes for the classification's entire duration, not just the current period. This is exactly the kind of error our review is built to catch.

Are fringe benefits or sick pay counted as taxable payroll?

It depends on the benefit type and how it's structured — some are included, some aren't. We can review your specifics rather than give you a generic answer that may not apply to your policy.

Subcontractors and 1099s

Why do you need proof of insurance for my subcontractors?

If a subcontractor can't show their own valid coverage, their payroll can get added to your premium as if they were your employee. A valid certificate is what keeps that from happening.

What happens if a subcontractor does not have their own insurance?

Their labor cost is typically charged to your policy at your applicable class code rate — which can mean a significant unexpected addition to your bill. We've seen this be one of the largest single drivers of an audit increase. Reach out to us — we may be able to help reduce your premium, and the consult is free either way.

What counts as a valid Certificate of Insurance (COI)?

Not every COI submitted actually holds up — coverage dates, policy type, and named insured all have to line up correctly. We check this against carrier databases as part of our review, which catches errors a quick glance wouldn't.

Do 1099 independent contractors count as my employees?

1099 status alone doesn't automatically exempt someone from your premium — carriers look at additional factors beyond how you paid them. This is a frequent source of audit disputes.

What specific forms prove an independent contractor is exempt?

Requirements vary by state and sometimes by carrier — a form that satisfies one may not satisfy another. Tell us your state and we'll tell you what you actually need.

Results and disputes

When will I receive the final audit results or bill?

Turnaround varies by carrier, typically 4–8 weeks after an audit — but you have rights around review even after you've received it, and most business owners don't realize how much room there is to challenge a result. Most carriers and states allow you to submit an audit dispute within 3 years of policy expiration.

What happens if my premium goes up and I owe additional money?

An increase isn't automatically correct — audit errors that raise a bill are common enough that a second look is worth it before you pay.

How do I dispute an audit result or incorrect classification?

There's a formal dispute process through your carrier, and your insurance broker should be able to assist. Some states publish plain-language walkthroughs of what the process looks like — Oregon's Small Business Ombudsman is a good example. We can tell you where you stand and what's realistic to recover.

Can I request a re-audit if I find missing documents later?

In many cases, yes! Reach out with your audit date and we'll tell you whether you still have a window.

Corrections: if you believe anything on this page is inaccurate or out of date, tell us and we'll fix it and note the change.