Workers comp payroll audit in Ohio
Workers comp carriers in Ohio reconcile estimated payroll against actual payroll Within 90 days of policy expiration for private employers, but BWC can audit at any time. after policy expiration. The audit can produce a refund (you over-estimated) or an additional premium bill (you under-estimated), and can reclassify workers between class codes based on the actual job duties seen on the books. Verified 2026-05-09.
How the Ohio payroll audit works
Workers comp carriers in Ohio reconcile estimated payroll against actual payroll Within 90 days of policy expiration for private employers, but BWC can audit at any time. after policy expiration. The audit can produce a refund (you over-estimated) or an additional premium bill (you under-estimated), and can reclassify workers between class codes based on the actual job duties seen on the books.
The audit is the carrier's reconciliation: the policy was bound on estimated payroll, but premium is rated on actual payroll. If the estimate was low, you owe additional premium; if it was high, you get a refund. The auditor also checks that every worker is on the correct class code based on actual job duties seen in the payroll records and any in-person walkthrough.
Records to keep
Pull together: payroll register by employee with class code allocation; quarterly 941s; year-end W-3 and W-2 totals; 1099-NEC totals for every contractor paid more than $600; certificates of insurance for every subcontractor (policy number, effective dates, carrier name); overtime hours and dollars by employee; written job descriptions for any worker on multiple class codes. Reconcile gross wages on the W-3 to the sum of W-2 box 5 plus 1099-NEC totals so the auditor can verify totals tie.
Overtime savings
Most Ohio class codes rate overtime at the straight-time wage. A worker earning $25 straight and $37.50 overtime contributes $25 per hour to rated payroll on an overtime hour, not $37.50. Document the overtime hours separately in the payroll register; if you cannot produce hours, the auditor rates 100% of the overtime wages at the full rate, which can add 5 to 10% to premium on payroll-heavy class codes.
Subcontractor exposure
A principal contractor can be held liable for the workers' compensation coverage of their subcontractors if the subcontractor does not have coverage. Without certificates of insurance for every sub, the auditor adds the sub payroll to your rated base under whichever class code matches the work performed. Keep certs in a binder with policy numbers, effective dates, and carrier names visible.
If the audit comes back wrong
You typically have 30 to 60 days from receipt of the audit results to file a written dispute with the carrier. Include the original payroll records, written job descriptions, certificates of insurance for subs, and any contracts. The carrier reviews and either adjusts or denies the dispute. If denied, Ohio insurance department complaint procedures and the rating bureau's reclassification appeal are next.
Related reading
FAQs
When does the workers comp payroll audit happen in Ohio?
Ohio carriers conduct the audit Within 90 days of policy expiration for private employers, but BWC can audit at any time.. Audits run on every policy at expiration; small policies are usually desk-audited (records emailed in), large policies get a physical visit.
What payroll records does the auditor want in Ohio?
The standard request: gross payroll by employee with class code allocation, quarterly 941 forms, year-end W-3 and W-2 totals, 1099-NEC totals for every contractor paid more than $600, certificates of insurance for every subcontractor with policy numbers and effective dates, overtime hours by employee (overtime is typically rated at the straight-time rate), and a written description of each job role.
How is overtime treated in a Ohio payroll audit?
Most Ohio class codes rate overtime at the straight-time portion only. If a worker earns $20 per hour straight time and $30 per hour overtime, only $20 of the overtime hour counts toward rated payroll. Document overtime hours separately in the payroll register; if you cannot produce hours, the auditor rates 100% of the overtime wages at the full rate.
What if I underestimated payroll at policy bind in Ohio?
The audit produces an additional premium bill (sometimes called an audit invoice or AP). Most carriers spread the bill across the policy renewal, but small carriers want it paid in 30 days. If you cannot pay, payment plans are usually available. Repeated under-estimation can lead the carrier to require monthly self-reporting on the next policy.
What if I overestimated payroll in Ohio?
The audit produces a return premium credit. If you stay with the same carrier, the credit usually gets applied to the renewal premium. If you switched carriers, the prior carrier issues a refund check, typically within 30 to 60 days of the audit close.
Can the auditor reclassify my employees in Ohio?
Yes. If the auditor sees that a worker on a clerical (8810) code spent material time on a higher-rate code, they can reallocate payroll between codes for the audited policy period. For workers on multiple codes, Ohio typically allows split allocation only if you have detailed job records, otherwise 100% of the worker's payroll moves to the highest-rated code.
Will the auditor charge me for 1099 contractors in Ohio?
Workers are generally considered employees unless they meet specific criteria for independent contractor status, which is determined by a multi-factor test focusing on control and independence. At audit, 1099 contractors without a certificate of insurance for their own workers comp typically get added to your rated payroll.