Workers' Comp Audit Checklist: Documents, Deadlines, Payroll Tie-Out

You need the payroll for the policy period, a tax document that verifies it, and proof of coverage for anyone you paid who isn't on payroll. Travelers' list is the shortest summary, and the other carriers we read add to it.

• Payroll reports. Each employee's name, a description of the work done, state of employment and gross wages, terminated employees included. Show overtime, severance and tips on their own lines if you pay them (Travelers).
• Check register and cash disbursements journal. These should cover subcontractor, casual labor and material costs.
• Tax documents. Form 941, state unemployment wage reports and 1099s per Travelers. biBerk asks for the Forms 941 for the previous four quarters and the 1099s for the latest completed calendar year.
• Certificates of insurance for each subcontractor and owner-operator. biBerk names the ACORD form 25.
• General ledger. biBerk lists it beside the check register, and Travelers says the auditor may read the checkbook, cash receipts or ledger for payments that payroll doesn't show.
• Substitutes if you have no Form 941. See the owner and sole proprietor section below.

Your notice names the exact documents. Travelers says so itself: you will be informed of the specific documents needed before the audit. Where a carrier asks for something this list lacks, send what the notice asks for.

The checklist changes with the premium basis: payroll for workers' comp and payroll-based general liability, sales for sales-based general liability. This table is built only from what each page lists.

Sources, opened 2026-10-19: Travelers workers' comp, Travelers payroll-based GL, Travelers sales-based GL and biBerk. "Not listed" means the page doesn't name it, not that the auditor won't ask. Carrier requirements differ, so your notice wins.

The auditor is checking one record against another. Travelers' workers' comp audit page says the auditor must review the payroll reports (the primary source) and validate them against numbers in tax forms (the verification source), and may also look at the checkbook, cash receipts or general ledger to find payments payroll doesn't show. The documents are used only to complete the premium audit.

Some states write the method into law. Florida's audit rule (Fla. Stat. 440.381(3), 2026 edition) says payroll verification audits must use state and federal reports of employee income, payroll and other accounting records, certificates of insurance maintained by subcontractors, and the duties of employees.

When the two sources disagree, expect follow-up questions. A gap you have already explained, in writing, takes one email to settle; an unexplained gap takes more of the auditor's time and more of yours. That is why the next section ties your payroll to the Form 941 before anyone asks.

Tie four sources to each other, one quarter at a time, and write a one-line reason for every difference. Here is the order.

1. Export the payroll register by check date for the policy period, with every employee and gross wages for each.
2. Subtract elective deferrals. The IRS instructions for Form 941 (revised 03/2026) say line 2 holds amounts that would also be in box 1 of your employees' Forms W-2, and the W-2 instructions (2026) say box 1 shows total taxable wages and leaves out elective deferrals such as traditional 401(k) contributions, while designated Roth contributions stay in. So register gross pay less pre-tax deductions, such as traditional 401(k) deferrals and pre-tax cafeteria plan deductions, is the number to expect on line 2.
3. Compare it with the Form 941, line 2, for the same quarter.
4. Compare the register with your state's quarterly wage report. If the report separates total wages from taxable wages, use total wages.
5. Compare the register with the wage accounts in the general ledger, including owner or officer pay that runs outside the register.

Illustrative example, in dollars, for a calendar-year policy. The register and the Forms 941 for four quarters:

The totals foot: 315,000 less 9,400 is 305,600, and 307,600 less 305,600 is the 2,000 difference. Q4 is the one to chase: the Form 941 shows 2,000 more than the register supports. In this illustration a year-end bonus went through a separate pay run that never reached the register export.

A free payroll-to-Form 941 tie-out sheet lays this out as a CSV: one row per quarter with the register, the Form 941 line 2 figure, the state wage report and the ledger side by side, and a column for the reason behind each difference. Its example rows are Illustrative, not client data.

It looks like three tables that agree, each with its reason lines. Continuing the illustration, adding the 2,000 bonus to the register makes gross pay 317,000 and expected line 2 equal to the filed 307,600. The ledger gets the same fix. Illustrative, in dollars:

The total after the fix equals the corrected register, 317,000. The third table ties subcontractor payments, which is where an uncertified sub can add premium. Illustrative, in dollars:

The columns foot: 18,400 plus 21,000 plus 12,000 is 51,400; materials 6,700 plus labor 44,700 is also 51,400. Subs B and C are the open items. Travelers says it may charge premium for a subcontractor's work when there is no valid certificate for the dates worked, so those two get chased before the audit, not after.

Travelers and biBerk accept a business tax return in place of the Form 941. For an owner with no employees on payroll, Travelers (checked 2026-10-19) says to provide:

• Sole proprietor: Form 1040 Schedule C, pages 1 and 2.
• Partnership: Form 1065, page 1, and Form 1125-A.
• Corporation: Form 1120, page 1, and Form 1125-A.

biBerk lists the same three families: Schedule C for sole proprietors, Form 1065 for LLCs and partnerships, and Form 1120 for corporations. A policy that shows no employees can still be audited, which is why these substitutes exist.

That means the 1099 list and the check register carry more weight. If you paid anyone for labor, the auditor will want the name, work description, dates, total paid, cost of materials and the certificate covering the dates worked. Whether an owner's own pay counts, and in what amount, depends on the state and the policy; ask your carrier or agent. What we do is put the pay records in order.

A small mismatch is allowed. Travelers says it is acceptable to deviate from the policy period by 30 days, so for a policy running 6/15 to 6/15 a payroll report for 7/1 to 6/30 or 6/1 to 5/31 is fine. The sales-based and payroll-based general liability pages say the same.

For tax reports, if the policy period falls mid-month, Travelers asks for the most recent four filed quarterly or annual reports that most closely match. The North Carolina Basic Manual makes a similar allowance for that state: audited information must coincide with the policy dates, with reasonable deviations that don't affect the earned premium permitted so the audit can start on the first of the nearest month (rule effective 2017-01-01, from the NCRB circular of 2016-11-02).

If your pay periods straddle the policy dates, say so in the tie-out and show which pay dates you included. If an entire quarter is missing, send the nearest filed reports and a note on what they cover; the auditor decides what is acceptable.

Your letter sets the date, and no carrier page we read gives one deadline for everyone. These are the figures that are published, each tied to its source.

Skipping the audit has a price. Travelers says failing to provide requested information may result in an audit noncompliance charge, an estimated audit or cancellation of coverage. The dispute guide covers the charge and how to clear it. On keeping records: the IRS says to keep employment tax records for at least 4 years, so payroll records from the last four years are worth keeping in one folder.

The audit starts after the policy period ends, and the clock after that depends on your carrier. Pinnacol says it audits each policy at the end of the policy period. The timings in the diagram come from one carrier's help article, Next Insurance (published 2026-07-14), so treat them as an example, not a rule.

The diagram runs left to right: the policy ends, the notice arrives, you send records or the auditor visits on the date in the notice, the carrier issues an audit summary within about a week, you have 30 days to review any added cost before the card on file is charged, and refunds for overpaid premium follow within 30 days of the summary.

A general liability audit is based on the exposure your policy was rated on, which is gross sales, payroll or the cost of subcontracted work, and your notice says which. Travelers publishes a sales-based page and a payroll-based page; Penn National says policies based on total costs are primarily general liability where subcontractors are used.

For sales, Travelers treats sales records as the primary source and verifies them against state sales tax returns, income statements or federal tax returns, with a 30-day allowance on dates. Penn National defines gross sales as the gross amount charged for all goods or products sold or distributed, and names deductions such as sales or excise taxes remitted to a government division and credits for returned merchandise.

For payroll and subcontract cost, the records look like a workers' comp audit: payroll reports with terminated employees included, the check register and cash disbursements journal, and certificates of insurance. The records you keep for one serve the other, so one tie-out covers both.

Project each period's payroll from this year's registers, add the hires and layoffs you already know about, and give your agent the number. The estimate is what the premium is built on, so the closer it is, the smaller the surprise at audit.

A workable method: take year-to-date payroll by month from the register, find the monthly run rate, adjust it for known staffing changes and seasonal swings (a landscaper's April to October crew is the textbook case), and write down the assumptions. Do the same for subcontractor cost and sales if your policy is rated on them. Then compare the estimate with the actual each quarter.

Travelers says to notify your agent, producer or company representative of large staffing changes because the policy may need to be endorsed. Next Insurance says that where payroll came in higher than estimated, you have 30 days to review the added cost before the card on file is charged (Next, 2026-07-14). The audit tie-out from last year shows how far the old estimate was off, which makes it the best starting point. Which class each worker's pay falls into is your carrier's call.

Finbryn organizes the records. We organize payroll records, track subcontractor certificates and can attend your premium audit with you where your carrier allows it. Our premium audit support page sets out the engagement.

We do not sell or advise on insurance coverage. Your carrier assigns class codes. If you disagree with the final bill, read how to check and dispute a premium audit bill next; we prepare the documents behind a dispute you file with your carrier or the rating bureau.

This guide describes what carrier pages said on 2026-10-19. Carriers change their pages, and states differ, so your policy, your notice and your state's rules govern; read them first. For the sub-by-sub records, see the related guide on subcontractors and certificates of insurance, and for splitting pay between trades see the one on class codes and payroll.