How to Dispute a Workers' Comp Audit, Step by Step

Updated October 21, 2026 · TrueUpAudit

Got a workers' comp audit bill you think is wrong? Here's the order to work in, from finding your deadline to escalating with NCCI, and what to send at each step.

Educational information only. Not insurance, legal, or consulting advice. TrueUpAudit is not an insurance agency or consultant. Rules differ by state and carrier. Always check your policy and your carrier's audit notice.

First: don't ignore it, and don't just pay it

A workers' comp premium audit bill feels final. It isn't. The audit is your carrier's calculation based on the records it saw and the classifications it chose. Records can be incomplete, payroll can be put in the wrong class, and subcontractors you had certificates for can still end up billed as your payroll. A specific, well-documented dispute is a normal part of the process.

Ignoring the bill is the worst option. Unpaid audit premium can lead to policy cancellation, collections, and trouble getting coverage next year. The best route is usually: pay what you agree with, dispute what you don't, in writing, with proof.

Step 1: Find your deadline

Look at your audit invoice and any letter that came with it. Carriers set their own dispute windows and they can be short. Write the deadline down and work back from it. If the paperwork doesn't say, call or email the carrier's premium audit department and ask: "What is the deadline to dispute this audit, and in what form do you need it?" Get the answer in writing if you can.

Step 2: Get the full audit worksheet, not just the invoice

The invoice shows a total. You need the detail behind it. Ask the carrier for the complete audit summary or worksheet, which normally shows:

• Each class code with the payroll the auditor assigned to it
• The rate per $100 of payroll for each class
• Any payroll added for subcontractors without certificates
• Your experience mod, discounts, and fees
• The deposit premium already credited

Compare it line by line with your policy declarations page and with your own payroll reports.

Step 3: Rebuild the math yourself

Before arguing with anyone, find out which lines actually drive the bill. Most audit increases come down to a few causes: payroll was higher than estimated, payroll landed in a more expensive class, or subcontractor payments were added as payroll.

If there's a big subcontractor line, estimate it separately with the Uninsured Subcontractor Calculator. If the estimator lands close to the invoice, the math is probably fine and the question is whether the inputs are right.

Step 4: Sort each item into "agree" or "dispute"

Go line by line. For every item you think is wrong, write down three things:

1. The specific error. "Payroll of $X for employee Y was placed in class A, but Y did only office work."
2. The correction you want. "Move $X to class B."
3. The records that prove it. Payroll reports, timecards, job descriptions, certificates of insurance, invoices, contracts.

Common items worth checking:

• Subcontractors with certificates that were still charged. Send the certificate showing coverage for the dates they worked for you. See uninsured subcontractor charges.
• Overtime. Many carriers exclude the extra "premium" portion of overtime if your payroll records show it separately: one-third of time-and-a-half pay, or half of double-time pay. This doesn't apply in every state (Travelers, for example, notes it doesn't apply in Delaware or Pennsylvania).
• Class placement. Payroll for one person generally can't be split between classes by estimate or percentage. If someone really worked in two classes, you need payroll records that track it that way. If you didn't keep them, the higher class may apply. Going forward, start tracking it.
• Payroll that shouldn't be there, such as amounts that were never paid in the policy period, or the wrong employees attributed to your policy.
• Officer or owner payroll that was included when an exclusion or a different treatment was in place. Rules differ by state.

Step 5: Pay the part you don't dispute

This matters more than people expect. Paying the undisputed amount shows good faith, helps keep your policy in force, and is a formal requirement for escalating in NCCI states (see Step 8). Ask the carrier to confirm in writing how much is in dispute and whether collection on that portion will be held while they review it. Don't assume it will be. State Fund in California, for example, says plainly that a vague dispute won't hold the bill.

Step 6: Send a specific written dispute

Put the dispute in writing and send it to the address or email shown on your audit invoice or policy notice. A strong dispute letter:

• Identifies your business, policy number, policy period, and invoice number
• Lists each disputed item separately, with the correction you want
• Shows the dollar effect of each correction, and the total
• Attaches the supporting records, labeled so they match each item
• States what you've already paid
• Asks for a revised audit or a written explanation

Keep it factual and calm. "Your audit is wrong" gets nowhere. "Line 3 charges $48,000 for ABC Framing; attached is ABC's certificate of insurance covering March 1 to December 31" gets results.

Step 7: Follow up, and ask for a re-audit if needed

Keep a log: date sent, how you sent it, who you spoke with, what they said. If you don't hear back within a reasonable time, follow up in writing. If the original audit was done by mail or phone and your records weren't fully reviewed, it's reasonable to ask for a re-audit or a review by an audit supervisor.

Meanwhile, talk to your agent or broker. They deal with the carrier regularly and can sometimes get attention on a file faster.

Step 8: Escalate if the carrier won't fix it

If you've genuinely tried to resolve it with the carrier and you're stuck, most states have a formal process.

States that use NCCI's dispute resolution process

According to NCCI, before you file you must have tried to resolve the dispute with your carrier, paid all undisputed premium, and given the carrier a written estimate of the disputed amount and how you calculated it. A request NCCI treats as complete (a "bona fide dispute") includes:

• Your written request for dispute resolution
• An estimate of the disputed premium
• Proof that the undisputed premium was paid
• Your calculation of the disputed amount
• Supporting documentation
• A description of your efforts to resolve it with the carrier

NCCI says to send it to DisputeResolution@ncci.com, by fax to 561-893-5043, or by mail to NCCI, 901 Peninsula Corporate Circle, Boca Raton, FL 33487-1362, and to copy all parties at the same time. Disputes that aren't settled can go to an appeals board of 3 to 10 members, where the policyholder typically gets 10 to 20 minutes to present. Whether the disputed premium is held during the process varies by state. Source: NCCI dispute resolution process.

One thing to know: an NCCI classification inspection looks at your current operations. NCCI notes it isn't binding for a past policy period, so don't count on it to rewrite an old audit on its own.

California

California doesn't use NCCI. Disputes go in writing to your insurer's designated office, and decisions can be appealed to the California Department of Insurance. If State Fund is your carrier, see our State Fund audit dispute guide.

Other states

Some states run their own rating bureaus and appeal processes. Your carrier's audit notice or your state insurance department's website should name the right one.

Step 9: Fix next year's audit now

• Collect a certificate of insurance from every subcontractor before work starts, and track expiration dates.
• Record overtime premium pay separately in your payroll system.
• If employees work in more than one class, track hours and pay by class.
• Update your estimated payroll with your agent mid-year if business grows, so the deposit is closer to reality.