Preparing a Client for a Workers' Comp Premium Audit: An Agent's Pre-Audit Checklist

10/13/2026

The workers' comp premium on the policy declarations is an estimate. The premium audit after the policy expires is where the real number gets set, and for many small and mid-sized commercial clients it is the most stressful part of the insurance year. An unexpected additional premium bill lands months after the term ended, the client calls the agency, and the account manager is trying to reconstruct payroll and subcontractor records that should have been collected before the auditor arrived.

Most audit surprises are predictable. They come from a short list of causes: payroll that grew faster than the estimate, subcontractors without proof of coverage, employees doing work in a higher-rated classification, overtime or officer payroll handled incorrectly, and records the client could not produce. This guide is a pre-audit checklist for commercial lines agents and CSRs. It explains what the workers comp audit checks, what the client should gather, and how to handle the result if the client disagrees with it.

Rules here follow NCCI's Basic Manual, which applies in most states. Several states use their own rating bureaus, and some write their own payroll and classification rules, so confirm the rules for your client's state before relying on any detail.

What a Premium Audit Checks

A premium audit compares what the policy assumed with what actually happened during the term. In NCCI states, premium for each classification is calculated per $100 of payroll, so the audit focuses on three questions:

1. How much payroll was actually paid? The auditor verifies total remuneration against payroll records and tax filings.
2. Is the payroll assigned to the right classifications? The auditor looks at what the business and each group of employees actually did.
3. Who else did work for the insured? Subcontractors and other workers without their own coverage can add payroll to the policy.

Audits come in several forms: a mail or voluntary audit where the client completes a form, a phone or virtual audit, and a physical audit where the auditor visits. The carrier decides which form to use, often based on premium size and class. Regardless of format, the client should treat the request seriously and respond on time. The policy requires the insured to cooperate with the audit, and an audit that cannot be completed can lead to additional charges or other consequences under the carrier's and state's rules, so a missed audit appointment is not a minor thing.

Records the Client Should Gather

Send the client a records list as soon as the audit notice arrives, or better, at policy inception so they keep records in a usable form all year. A typical request includes:

• Payroll journals or registers for the policy period, showing each employee's gross pay, overtime, and job title or duties.
• Federal Form 941 quarterly returns and the state unemployment wage reports for the quarters covering the policy period.
• Form W-2 / W-3 and Form 1099 summaries, if the policy period lines up with a calendar year.
• General ledger or check register, showing payments to subcontractors, casual labor, and contract labor.
• Certificates of insurance for every subcontractor, showing workers' comp coverage in force for the dates the sub worked.
• Officer, owner, and partner information, including ownership percentages and any exclusion or election filed with the state.
• Records of overtime, separated from regular pay, by employee and in summary by classification.
• Time records or job-cost reports if any employee's payroll is to be split between classifications.

Payroll for workers' comp purposes is defined by the manual, not by the payroll system. NCCI's definition includes wages, commissions, bonuses, holiday, vacation, and sick pay, and the employee's pre-tax salary-reduction contributions to retirement and cafeteria plans. It excludes tips, employer contributions to group insurance and pension plans, severance pay (except for time worked or vacation accrued), and expense reimbursements that the employer's records confirm were valid business expenses. A client who simply hands over gross wages may pay premium on items that should have been excluded.

For agents who want to understand how auditors work through these records, ABTC's principles of premium auditing course covers the auditor's side of the process.

Subcontractors, Certificates of Insurance, and Uninsured Subs

Subcontractors are the most common source of large audit bills, especially for contractors. Under most states' workers' comp laws, a contractor can be responsible for the injured workers of an uninsured subcontractor. Insurers price that exposure by charging premium for uninsured subs.

Under NCCI's Basic Manual, the contractor must show satisfactory evidence, typically a certificate of insurance, that each subcontractor carried workers' comp covering the work performed for the contractor. When the evidence is missing:

• If the subcontractor's payroll records are available, the auditor uses that payroll.
• If payroll records are not available, the manual uses a portion of the subcontract price as payroll, with minimum percentages that depend on the type of contract (labor only, labor and materials, and so on).
• The added payroll is assigned to the classification of the work the sub performed, and the contractor's own experience mod applies.

The fix is entirely in the client's process, and it has to happen before the work starts, not at audit time:

• Collect a current certificate of insurance before a sub starts work.
• Check that the coverage dates span the dates the sub actually worked.
• Track expiration dates and request renewals.
• Keep a copy of any state exemption certificate or exclusion a sub claims.
• Keep subcontractor payments in a separate account or ledger code so the auditor can see them clearly.

A sole proprietor sub without employees may not be required to carry coverage in some states, but the contractor still needs documentation that satisfies the carrier. Ask the carrier what it accepts before the client relies on it.

Overtime, Officers, and Excluded Payroll Items

Overtime

Under NCCI's Basic Manual, the extra pay for overtime is excluded from premium payroll, provided the insured's books show overtime pay separately by employee and in summary by classification. Extra pay is the difference between the regular rate and the overtime rate multiplied by the overtime hours.

• If the records show the overtime premium separately, that entire amount is excluded.
• If time-and-a-half is paid and the records show total overtime pay as one combined amount, one-third of that amount is excluded.
• If double time is paid and total pay for that overtime is recorded separately, one-half is excluded.

Shift differentials and other "premium pay" for working nights, weekends, or unusual conditions as part of a normal schedule are not overtime under the rule. If an employee works over 40 hours but is not paid an increased rate, there is nothing to exclude.

The exclusion is not universal. Some states with independent rating bureaus do not allow it, or apply it differently, so check the state manual. In NCCI states, the biggest risk is records: if overtime is not broken out by employee and classification, the client may lose the exclusion. Ask the client's payroll provider whether its reports can show overtime premium separately before audit time.

Officers and owners

Executive officers, sole proprietors, partners, and LLC members are treated differently by state. Whether each is covered automatically, excluded automatically, or able to elect in or out depends on the state's workers' comp law, so check the state agency's rules and the policy endorsements. NCCI's Basic Manual applies minimum and maximum payroll amounts to executive officers in many states. The minimum applies even if the officer drew little or no salary, and the maximum caps the payroll used. These limits are set state by state and change periodically, so pull the current figures from the rating bureau or the carrier rather than relying on last year's.

Before the audit, confirm:

• Who the officers, owners, partners, or members are, and their ownership percentages.
• Whether any exclusion or inclusion election was filed with the state or endorsed on the policy.
• How each officer's duties break down, since officer payroll is classified by the work the officer does.

Other excluded items

Remind the client that tips, employer contributions to group insurance and pension plans, severance pay except for time worked or vacation accrued, and substantiated business expense reimbursements are generally excluded under NCCI's rules. Each exclusion depends on the client's records showing the amount clearly.

Disputing an Audit Result

When the client believes the audit is wrong, the first step is the carrier. Request a copy of the audit worksheet and the auditor's notes. Identify specifically what is in dispute: a classification, a payroll figure, an uninsured subcontractor charge, an officer's payroll, or an overtime exclusion. Provide the documents that support the client's position, in writing.

Many disputes end there because the auditor did not have a certificate, a payroll breakdown, or a time record that the client later produces. Carriers often accept a re-audit or a revised audit when the new documentation is solid.

If the carrier and the employer cannot resolve the dispute, NCCI's manuals include a dispute resolution process. In NCCI states, an employer that cannot reach a resolution with its insurer can ask NCCI to refer the matter to the state's appeals board for a hearing, and further appeal to the state insurance department may be available. The boards generally hear disputes about classification assignments, experience mods, and application of manual rules. Coverage questions, such as whether certain workers were covered, are decided by the carrier. Deadlines and procedures vary by state, so check the state insurance department's guidance early.

Your role as the agent is to help organize the client's documentation and communicate clearly. Avoid telling the client they will win a dispute or how much they will recover.

Mid-Term Payroll Adjustments to Avoid Surprises

The cheapest audit dispute is the one that never happens. Several mid-term practices reduce surprises:

• Ask for a mid-term payroll check-in. For seasonal or growing businesses, ask the client for year-to-date payroll halfway through the term. If payroll is running well above the estimate, ask the carrier whether it will endorse the policy to a higher estimate.
• Consider pay-as-you-go options. Some carriers and payroll providers offer programs that calculate premium from actual payroll each pay period. These can smooth cash flow, but they do not eliminate the audit, and payroll data still needs to be classified correctly.
• Notify the carrier of new operations. If the client adds a new operation, location, or state, report it during the term rather than at audit.
• Set up subcontractor tracking at inception. A certificate log maintained through the year turns the audit into a reconciliation rather than a search.

For deeper training on classifications, mods, and audits together, ABTC offers a workers' comp premium control, experience mods, classifications, and audit mastery course.

A Pre-Audit Checklist to Send the Client

The text below is a sample. Adapt it to the carrier's audit request, your client's state, and your agency's practices.

Sample: Workers' Comp Premium Audit Preparation Checklist

Policy number: ______________ Policy period: ______________ Audit date/type: ______________

Payroll

• [ ] Payroll register for the full policy period, by employee, with job titles
• [ ] Payroll totals by classification, matching the classifications on the policy
• [ ] Overtime premium shown separately by employee and by classification
• [ ] Forms 941 and state unemployment wage reports for the quarters in the policy period
• [ ] Notes on any employees who changed duties or locations during the term

Owners and officers

• [ ] List of officers, owners, partners, or members, with ownership percentages and duties
• [ ] Copies of any state exclusion or election forms

Subcontractors and contract labor

• [ ] List of all subcontractors and amounts paid during the policy period
• [ ] Certificate of insurance for each, showing workers' comp coverage for the dates worked
• [ ] Documentation for any sub claiming an exemption
• [ ] Payments to casual or temporary labor, and staffing agency invoices

Exclusions

• [ ] Expense reimbursement records showing the business purpose
• [ ] Employer contributions to group insurance and retirement plans, shown separately
• [ ] Severance or other excluded payments, identified

After the audit

• [ ] Copy of the audit worksheet requested
• [ ] Any disagreements documented in writing and sent to the carrier with supporting records

Help Your Client's Team Own the Process

Audits go better when someone at the client understands why the records matter. ABTC's workers' compensation training supports agents and account managers who want to deepen their technical knowledge.

For the client's HR, payroll, or office manager, the Workers' Compensation Training & Certification program covers how premiums are determined and how employers can affect them, along with injury reporting, claims, and employment records. It is online and self-paced with one year of access and an optional exam for the Certified Workers' Compensation Administrator designation. It is professional training, not state insurance CE.

Frequently Asked Questions

What does a workers comp audit look at?

A premium audit verifies the payroll actually paid during the policy period, checks that payroll is assigned to the correct classifications, and identifies subcontractors or other workers who may add premium. The auditor reviews payroll registers, tax filings, the general ledger, and certificates of insurance. The result replaces the estimated premium on the policy with a premium based on actual exposure, which can produce either a bill or a refund.

Is overtime included in workers' comp payroll?

Under NCCI's Basic Manual, the extra pay for overtime is excluded, but straight-time pay for those hours is included. The exclusion depends on records that show overtime separately by employee and in summary by classification. Shift differentials paid for normal schedules are not overtime under the rule. Some states with independent rating bureaus treat overtime differently, so check the state manual for your client.

Why did my client get charged for a subcontractor?

If a subcontractor did not have workers' comp coverage, or the client cannot show a certificate of insurance covering the dates the sub worked, the carrier may add the sub's payroll to the client's policy. If the sub's payroll records are not available, a portion of the contract price is used instead. The fix is collecting and tracking certificates before any sub starts work.

How is officer payroll handled in a premium audit?

Many states set minimum and maximum payroll amounts for executive officers, so the payroll used may differ from what the officer was actually paid. Whether officers, owners, partners, or LLC members are covered at all depends on state law and any elections filed. Officer payroll is classified by the duties the officer performs. Check current state limits with the carrier or the rating bureau.

Can a client dispute a workers comp audit?

Yes. Start with the carrier: request the audit worksheet, identify the specific items in dispute, and provide supporting documents in writing. Many disputes are resolved with a revised audit. In NCCI states, if the employer and insurer cannot resolve it, the employer can use the dispute resolution process in NCCI's manuals, which can lead to a hearing before the state's appeals board. Procedures and deadlines vary by state.

How can clients avoid a big audit bill?

Build the payroll estimate carefully at renewal, check payroll mid-term and ask the carrier to adjust the estimate if it has grown, collect subcontractor certificates before work starts, keep overtime records separate, and report new operations during the term. None of these change what is owed, but they prevent the surprise of a large bill months after the policy ended.

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