The bargain workers comp represents

Workers' compensation is a no-fault system created by statute in the early twentieth century as a trade. Injured employees receive medical care and wage replacement without having to prove the employer was negligent. In exchange, workers comp is generally the exclusive remedy — employees give up the right to sue their employer in tort for workplace injuries.

Benefits typically include full medical treatment for the work injury, temporary disability payments replacing a portion of lost wages (commonly around two-thirds, subject to a state maximum), permanent disability benefits where impairment persists, vocational rehabilitation in some states, and death benefits to dependents.

The second half of the policy, employers liability, covers the narrower situations where an employee or a third party can still sue the employer despite exclusive remedy — actions by a spouse, third-party-over actions, and dual-capacity claims.

Who is required to carry it

Requirements are set state by state, and the trigger is usually a headcount.

Most states require coverage from the first employee. A minority set higher thresholds: two (Virginia), three (Arkansas, Georgia, New Mexico, North Carolina), four (Florida, South Carolina) and five (Alabama, Mississippi, Missouri, and for certain employers Tennessee).

Texas is the exception. It is the only state where workers' compensation is elective for private employers. A Texas "non-subscriber" must notify the state and its employees, and gives up the common-law defenses of contributory negligence, assumption of risk and the fellow-servant rule — which is why many Texas non-subscribers buy alternative occupational injury plans and separate employers liability coverage.

Owner and officer treatment varies as well. Sole proprietors, partners and LLC members are commonly excluded by default but may elect coverage; corporate officers may be able to opt out within limits. Independent contractor status is determined by state tests, not by what the contract says — and uninsured subcontractors are frequently reclassified as your employees at audit.

Because these rules change, verify current requirements with your own state's workers' compensation agency before relying on any summary, including this one.

How premium is calculated

The formula is unusually transparent:

Premium = (Payroll ÷ 100) × Class Code Rate × Experience Modification Factor, then adjusted for carrier-specific credits and state assessments.

Payroll is gross remuneration, split by class code. Class codes describe the work performed, and in most states the rates or loss costs are filed by NCCI; a handful of states run their own rating bureaus. Clerical office staff and roofers are separated by an order of magnitude.

The experience modification factor — the ex-mod — compares your actual losses over a three-year window to what is expected for a business of your size and class. A 1.00 is average. Below 1.00 discounts your premium; above 1.00 surcharges it. Two features surprise employers: the ex-mod weights claim frequency more heavily than severity, so several small claims damage it more than one large one; and it lags, so a bad year follows you for three rating periods.

Because the policy is auditable, the premium billed at inception is an estimate against projected payroll, trued up at year end.

Where rates are heading

Workers' compensation has been the most consistently profitable major commercial line in the U.S. for a decade, and rates have reflected it.

NCCI, which files loss costs in most states, expects approved filings to reduce written premiums by an average of about 5.0% from 2025 to 2026. State-level filings in the most recent cycle ranged from a 15.6% decrease to a 21.6% increase, the latter a Nevada outlier.

Recent individual filings illustrate the pattern: West Virginia filed a 13.5% decrease effective January 1, 2026; New Hampshire a 5.6% decrease; Oklahoma 4.7% decreases to both voluntary loss costs and assigned risk rates effective January 1, 2026; and Colorado approved a 4.3% reduction for 2025, part of a cumulative 53.5% decline over eleven years.

The driver is a long decline in lost-time claim frequency, partially offset by rising claim severity as medical costs increase. Falling loss costs do not automatically mean your premium falls — your payroll, class mix and ex-mod can move the other way.

How to actually lower your cost

  1. Audit your class codes. Misclassified payroll is the most common and most recoverable overcharge. Clerical employees assigned to a manual class code cost multiples of what they should.
  2. Manage frequency, not just severity. Because the ex-mod is frequency-weighted, preventing a series of minor recordable injuries improves your rating more than avoiding one large loss.
  3. Run a return-to-work program. Modified or light duty converts indemnity claims into medical-only claims, which are discounted in the ex-mod calculation in most states.
  4. Report injuries immediately. Delayed reporting reliably increases claim cost and litigation likelihood.
  5. Verify subcontractor coverage. Collect current certificates. Uninsured subs get added to your payroll at audit.
  6. Request your ex-mod worksheet from the rating bureau and check it for errors. Closed claims carrying open reserves inflate the calculation, and reserve corrections can be worth a lot.
  7. Consider a deductible or a group program if you have scale and a good record.

Frequently asked questions

In most states, yes — the requirement usually attaches at the first employee regardless of hours, though a minority of states set higher headcount thresholds and some exempt certain categories such as domestic or agricultural workers. Confirm with your state agency.
Usually not by default. Sole proprietors, partners and LLC members are commonly excluded unless they elect inclusion, and corporate officers can often opt out within state limits. Electing coverage adds their payroll to the premium calculation.
A multiplier comparing your actual claims over a three-year window against expected losses for your class and size. 1.00 is average; 0.85 is a 15% discount; 1.20 is a 20% surcharge. It is calculated by the rating bureau, not by your insurer, and you can request the worksheet.
Generally no — the going-and-coming rule excludes ordinary commuting in most states. Exceptions exist for travel that is part of the job, employer-provided transport, and trips on the employer's behalf. State case law varies considerably.

Sources

Every figure above is drawn from the following publications. Links open on the publisher's own site.

IW

InsureWiseHub editorial team

We write plain-language explainers about U.S. insurance and cite a primary source for every number. We do not sell insurance and we are not paid by insurers. Read our editorial policy.

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