How Much Does Workers’ Compensation Insurance Cost?

The basic formula

Most workers’ compensation policies start with three pieces: a classification code for each type of work, a rate assigned to that code, and your estimated payroll. Rates are usually expressed per $100 of payroll, so a higher-risk classification with the same payroll produces a higher premium.

That starting figure is then adjusted by your experience modification rate (if you qualify for one), any credits or debits the insurer applies, policy minimums, and state-specific fees or assessments.

What moves the number

The factors below tend to have the greatest influence on what a business pays.

• Classification: roofing, framing, and trucking carry very different rates than clerical or sales work.
• Payroll: premium generally rises and falls with the payroll reported in each class.
• State: each state sets its own rules, rate structures, and benefit levels.
• Claims history: frequent or severe injuries can raise your experience mod over time.
• Subcontractors: uninsured subcontractors can be added to your payroll at audit.
• Safety programs and return-to-work practices, which some insurers consider in pricing.

Why the final cost is set at audit

Workers’ comp premium is typically based on estimates at the start of the policy and reconciled after it ends. An audit compares the estimated payroll to actual payroll by class. If payroll grew or work shifted into a higher-rated class, you may owe additional premium. If it fell, you may receive a return.

Keeping payroll records organized by job type, and collecting certificates from subcontractors throughout the year, helps prevent surprises at audit.

Practical ways to control cost

Make sure each employee is classified correctly, report payroll estimates honestly, address injuries quickly, and keep documentation for subcontractors. A broker can also review whether your classifications and mod are being applied accurately and approach insurers whose appetite fits your operation.