Workers’ Compensation Premium Audits

Workers’ compensation premium is usually based in part on payroll assigned to job classifications, multiplied by rates and adjusted under applicable rating rules. At policy inception, the insurer often uses estimated payroll because the final year’s payroll is not yet known. The policy is then audited to determine the actual earned premium for the completed coverage period. If actual exposure is higher than estimated, the employer may owe additional premium; if it is lower, a credit or return premium may be due, subject to policy terms and minimum premiums.

The Texas Department of Insurance’s Basic Manual states that workers’ compensation policies are subject to final premium adjustment based on actual exposure. TDI materials describe premium audits as a way to reconcile estimated and actual payroll and premium. The precise audit requirements, records, timing, and consequences depend on the policy, manual rules, and applicable law. Employers should read their policy’s audit condition rather than relying on a general description or an agent’s informal estimate.

Why the insurer audits

An audit helps the insurer rate the exposure that actually occurred. A business may hire more employees, add a new type of work, change operations, use subcontractors, or move employees into different jobs. A restaurant that estimated only kitchen payroll may add catering delivery; a contractor may hire temporary labor or subcontract a specialized operation; and a startup may grow much faster than its original estimate. The audit checks whether the premium basis and classification assumptions match the policy-period operations.

A premium audit generally reviews exposure, not whether an individual injury claim is payable. The auditor may ask about payroll, job duties, work locations, subcontractors, overtime, and ownership. A claim adjuster investigates injury facts and compensability. A safety consultant evaluates hazards and risk controls. The same records can be relevant across these functions, but their purposes differ.

How premium is generally calculated

A simplified pricing concept is: auditable payroll divided by a stated unit, multiplied by the rate for the applicable classification, then modified by any applicable experience rating, schedule credits or debits, premium discounts, assessments, and policy charges. Texas rating rules and the policy determine the actual calculation. A classification code represents an operation or exposure, not just a job title. The audit may review actual duties and the employer’s business operations when deciding which payroll belongs in a code.

Classification is tied to work performed

Classification systems group employers and operations according to workplace hazards and expected loss experience. An employee’s title—‘manager,’ ‘technician,’ ‘helper,’ or ‘owner’—may not by itself determine the applicable code. The auditor can ask what tasks the employee actually performed, where work occurred, and whether separate records identify payroll for distinct operations. If duties cross classifications, the governing manual determines whether payroll separation is permitted and what records are needed.

For example, a construction company may perform both roofing and clerical work. Its office employee’s payroll might be treated differently from a field roofer’s payroll if the classification rules allow a separate clerical code and the employer maintains reliable records. Without adequate separation, the manual may require a different treatment. Do not assume the employer can create a split after the fact; the rules and contemporaneous records control.

Subcontractors and certificates

Contractors should keep written agreements, invoices, work descriptions, payment records, and current proof of workers’ compensation coverage for subcontractors. A certificate can show coverage information for a date, but it is not the policy and may not establish that the subcontractor had employees, covered the correct entity, or insured the period and operations at issue. The audit may examine whether the subcontractor was a true independent business, whether employees were used, and whether coverage existed for the work performed.

If a subcontractor lacks valid coverage or provides incomplete records, the audit may treat payments or payroll as exposure under the employer’s policy, subject to applicable rules. The employer should track subcontractor legal name, tax identification details, contract period, scope, payroll when required, and policy verification. A general contractor should also evaluate contractual insurance requirements separately from the premium-audit recordkeeping function.

Records to prepare

• Payroll journals, quarterly tax reports, W-2s, 1099s, cash disbursement records, and employee rosters.
• Job descriptions, time records, job-cost ledgers, and documentation of work performed by classification.
• Subcontractor contracts, invoices, certificates, policy information, and proof of payments.
• Records showing owner, officer, member, or partner status and any coverage election or exclusion.
• Location and state records for employees who traveled, worked remotely, or performed out-of-state assignments.
• Overtime details, tips, bonuses, reimbursements, and other payroll items needed under the applicable manual.
• Policy declarations, endorsements, audit requests, prior audit reports, and correspondence about operations or classification changes.

Reconcile the records before the audit. Compare payroll reports to general-ledger totals and explain differences such as reimbursements, severance, or timing adjustments. Separate clerical and field payroll contemporaneously if the classification rules permit. Identify new operations before the auditor discovers them so the insurer can evaluate whether the policy description and state schedule should be updated. Keep copies of everything submitted and note who answered each auditor request.

Audit methods and access

An audit may be conducted onsite, remotely through secure document exchange, by phone, or through another method permitted by the contract and applicable rules. A remote audit may ask for records electronically; an onsite audit may include interviews and a review of books, job files, and payroll systems. The insurer may need information from the employer’s accountant or payroll provider, but the employer remains responsible for the accuracy of records and responses.

Respond by the requested deadline and clarify what period and records the auditor needs. If records are maintained in multiple systems or locations, explain that and provide an organized index. Do not send unnecessary personal information or bank credentials. Verify the auditor’s identity through the carrier or broker if the request is unexpected. A refusal or failure to cooperate can have consequences under the policy or manual, so read the audit clause and contact the insurer promptly if there is a genuine access or timing problem.

Reviewing an audit statement

When the report arrives, compare each classification and payroll amount with the employer’s records. Check policy effective and expiration dates, included entities, state exposures, subcontractor treatment, owner status, overtime, and any credit or modifier. Ask for the worksheet and rule basis for a substantial change. An audit may reveal a classification dispute, an undisclosed operation, or a bookkeeping mismatch; identify the specific line item rather than objecting only to the total balance.

If the employer disagrees, follow the insurer’s written audit-review or dispute process and deadlines. Provide supporting records and a concise explanation. An agent can help explain the policy and file the challenge, but the carrier applies the rating rules and decides the audit. Separate a dispute about premium calculation from a dispute about whether insurance coverage existed for an injury. TDI regulates insurance and provides consumer resources, while DWC administers the workers’ compensation claim system.

What if the employer’s exposure changed midterm?

Tell the insurer or agent when the business adds a new operation, begins work in another state, hires a significant number of employees, changes subcontracting practices, or purchases another entity. The change may require a policy endorsement, additional state listing, or revised estimated payroll. Waiting for the audit can leave a coverage gap, reporting problem, or large unplanned final bill. The audit reconciles premium; it does not necessarily retroactively fix every coverage issue.

A business should budget for the audit settlement as a variable cost. Monthly payroll review and a quarterly exposure forecast can identify shortfalls early. A contractor can also request updated subcontractor certificates before work begins and set renewal reminders. These controls reduce surprises but do not guarantee a particular premium or classification outcome.

Worked example

A Texas electrical contractor estimates $600,000 of payroll when a policy begins. During the year it hires additional crews, pays overtime, and uses several subcontractors. At audit, payroll totals $850,000. One subcontractor has a current certificate covering its own employees; another has no verifiable policy for the contract period. The auditor reviews the classifications, payroll and subcontractor documentation under the policy and manual. The final premium may increase because actual exposure is higher and because the second subcontractor’s status and records need to be evaluated. The audit’s result cannot be calculated from gross payroll alone without applying the actual rates, rules, and policy terms.

Common exam mistakes

• Treating the estimated deposit premium as the final premium for an auditable policy.
• Confusing a premium audit with a claim investigation or workplace safety inspection.
• Assuming job titles alone determine classification codes.
• Assuming every subcontractor certificate proves coverage for all entities, employees, dates, and work.
• Ignoring that actual payroll or operations may change during the policy term.
• Assuming a disputed audit changes whether an injury is covered under the policy.
• Failing to preserve payroll, job-cost, subcontractor, and classification records.
• Treating an audit premium adjustment as automatically proof of fraud or wrongdoing.

Frequently asked questions

Why does workers’ compensation have a premium audit?

The initial premium is often based on estimated exposure. An audit compares the estimate with actual payroll and operations for the policy term so the earned premium can be adjusted.

Can a workers’ compensation audit increase my premium?

Yes. If actual payroll or other rated exposure exceeds the estimate, additional premium may be due, subject to the policy, manual rules, and minimum premium provisions.

Do subcontractors affect a premium audit?

They can. The auditor may review contracts, payments, work performed, and proof of the subcontractor’s coverage under applicable rules.

Can I challenge a premium audit?

Follow the carrier’s stated review process and deadlines, and provide records supporting the disputed classifications or exposure amounts.

Prepare for the Texas P&C exam

What happens when estimated and actual exposure differ

Premium is commonly calculated from a rate applied to payroll or another exposure base, adjusted by the policy’s classification and rating factors. The application uses estimates because the final payroll is not known at inception. At audit, the insurer compares the estimate with actual exposure during the policy term and applies the correct classification and rates. If actual exposure was higher, the business may owe additional premium; if it was lower, the insurer may issue a return premium, subject to the contract, minimum premium, and applicable rules. An adjustment is not necessarily a penalty: it reconciles estimated exposure to the policy’s final exposure basis.

For example, a small contractor estimates $300,000 in payroll and expects most labor to fall in one classification. During the year it hires additional employees and pays $420,000, including payroll for a higher-hazard roofing operation. An audit can change both the payroll basis and the classification applied to portions of that work. A spreadsheet that reports only total wages will not explain which people performed which duties, whether subcontractors had their own coverage, or whether remuneration was allocated correctly. Keep contemporaneous, employee-level records and written job descriptions so the auditor can test the exposure.

If the business disagrees with an audit, it should request the specific workpapers, classification decisions, payroll periods, and subcontractor treatment behind the calculation. Compare those items with payroll registers, tax filings, timecards, contracts, certificates, and the policy’s classification rules. Send the insurer a concise, documented correction request and follow the policy’s dispute and payment procedures. A disagreement should focus on verifiable facts, such as duplicated payroll or work assigned to an incorrect class, rather than simply disputing that the audit occurred. Ask the agent or carrier about applicable appeal timelines because the contract and state rules may govern them.

Workers’ compensation premium audits test the difference between estimated and actual exposure and the role of payroll classifications. The Texas Property and Casualty exam course helps you connect the audit to premium calculation and the insurer’s policy conditions.