Workers' comp for staffing agencies: class codes, premium math, audits and state-fund states (2026)

A staffing agency is the employer of its temporary workers, so its workers' compensation policy covers them, and the premium is priced by class code: in states that follow NCCI's Basic Manual rule, a temp is classified the same as the client's own employees doing the same or similar work. Premium is usually payroll divided by 100, times the class rate, times the experience modification factor, paid as an estimate and settled at a year-end audit, where a temp staffing firm's classes can be changed for the whole policy term. In North Dakota, Ohio, Washington and Wyoming, coverage comes from a state fund, and Washington charges by hours worked, not payroll. All of this is as of October 2026 and is general information, not insurance or legal advice.

Our staffing agency insurance requirements guide gives comp one section among all the policies an agency carries. This page goes deeper on comp alone: classification, the arithmetic, the audit, the state-fund states and how the cost reaches the bill rate.

Is workers' comp required for a staffing agency?

In almost every state, yes, because the agency employs the temps. The exception that comes up most is Texas, where the Texas Department of Insurance says private employers can choose to carry workers' compensation "but it is not required in most cases"; employers without it must report that to the state and report certain injuries (TDI, Division of Workers' Compensation, checked October 2026). In practice, clients' supplier agreements require coverage anyway, often with an alternate employer endorsement naming the client, which the insurance guide explains.

Which class code does a temp go under?

NCCI's Basic Manual Rule 1-D-3-f covers employee leasing firms, labor contractors, professional employer organizations and temporary labor services. As adopted in North Carolina in 2017, it reads: leased workers "must be classified the same as direct employees of the client performing the same or similar duties," and if the client has no such employees, they are classified "as if they were direct employees of the client entity" (North Carolina Rate Bureau circular C-17-6, NCCI item B-1433). Its own example: at a retail store client in code 8017, a temp cashier goes in 8017, and a temp delivery truck driver goes in 7380, just as the store's own driver would.

What that means day to day:

• The client's work decides the class, not your job title. "General labor" on your order is not a class code. Ask what the worker will physically do, where, and with what equipment.
• One client can mean several classes. A distribution center client may need warehouse, clerical and driver classes for different temps.
• Duties drift. A temp moved from the front office to the loading dock has changed class. Make the client tell you, in writing, before it happens.
• Some states use their own systems. Washington has 19 risk classes "that apply only to temporary staffing companies," from 7104 Administrative Staff to 7122 Laborers for Manufacturing, and tells agencies to choose the class that best matches the client's job description (Washington L&I, temporary staffing). States with their own rating bureaus publish their own manuals, so check the one that applies.

How is the premium calculated?

NCCI explains that rates are set by classification as averages for similar employers, and experience rating then adjusts each employer's premium by comparing its own payroll and losses, usually over the latest three years of data, with the average for its classes; a better-than-average record earns a credit mod below 1.00 and a worse one a debit above it (NCCI, ABCs of Experience Rating). NCCI's expected loss rates are stated per $100 of payroll, which is how manual premium is built too:

Manual premium = sum over classes of (payroll in the class / 100 x class rate)
Modified premium = manual premium x experience modification factor
(then any plan adjustments: premium discounts, expense constants,
 state assessments and so on, which vary by state and insurer)

Washington works differently. L&I says its "premiums are based on hours worked instead of payroll," part of the premium is paid by the worker, premiums are reported and paid quarterly, and a firm's experience factor cannot change more than 25% from the previous year, with one exception (L&I, unique premium rating features). L&I has proposed a 4.9% increase in the average hourly rate for 2027, with final rates adopted on November 30 (L&I, September 22, 2026).

What happens at the year-end audit?

Alaska's Division of Insurance puts it plainly: the premium shown when a policy is issued "is an estimate based on the insured's anticipated payroll," and the final premium is determined after the policy ends using actual payroll and the proper classifications and rates. The insurer audits your records to get there, and may ask for Forms 941 and 940, W-2s, state unemployment reports, the payroll ledger and a list of subcontractors with certificates of insurance (Alaska Bulletin B 15-08). Ohio's state fund does the same through an annual true-up of actual payroll.

The rule that catches staffing agencies is about timing. For most businesses, a classification correction that raises premium can only be applied from a certain point in the policy term. The same NCRB circular lists exceptions, and temporary labor services, employee leasing firms and PEOs are among them: their "classifications are assigned and applied at any time during the term of the policy or at audit." A whole year of temps reported in a cheap class can be repriced at once.

Before the auditor arrives:

• Keep payroll split by class code for every client, not one line per client.
• Keep a written job description from each client for each order, signed or emailed.
• Keep certificates of insurance for any subcontractor or 1099 worker, or expect their pay to be added to your payroll.
• Reconcile the auditor's worksheet to your payroll before you sign it; Delaware's insurance department told carriers in 2026 to send the calculations and supporting documents with audit bills (Delaware Bulletin 159), which is a fair thing to ask for anywhere.

Which states require the state fund?

If your national policy is written by a private carrier, these states sit outside it. Open the state account before the first worker starts there, and ask your broker how employer's liability is handled in those states, since the state fund and your private policy may not line up.

How do you pass comp into the bill rate?

Convert the premium into a cost per hour of each order, by class:

Comp cost per hour = pay rate / 100 x class rate x experience mod
(Washington: the hourly base rate x experience factor, less the
 part the worker pays)

Put that figure into the burden alongside payroll taxes; how to calculate staffing markup shows the full build. When rates change on January 1, a client contract may let you pass the increase through; the bill rate increase letter has the wording.

How do you keep claims, and the mod, down?

• Share safety duties with the client in writing. OSHA treats staffing agencies and host employers as jointly responsible for temp safety; see OSHA temporary worker rules for staffing agencies.
• Visit the site before the first start on any order with machinery, heights, chemicals or driving.
• Refuse silent duty changes. A temp doing work you did not price is uninsured risk at the wrong rate.
• Report injuries the day they happen and offer modified duty where the client can provide it. Your claims feed the mod for three years.
• Never pay temps on a 1099 to avoid premium. See worker misclassification for staffing agencies, and the joint-employer risk in joint employer liability for staffing agencies.