How much does workers’ comp cost for a small business?

Typical workers’ comp costs

Insureon’s medians reflect very small businesses: 47% of its customers pay less than $50 a month and 24% pay between $50 and $100. Businesses with three to five employees average about $62 a month, and those with ten or more about $160. Industry matters even more: finance and accounting firms run about $34 a month, while construction and contracting businesses average $179.

The workers’ comp premium formula

Insureon summarizes the standard calculation as: classification rate × experience modification rate × (annual payroll ÷ $100). Each piece is worth understanding.

• Classification rate: each job type has a class code with a rate per $100 of payroll, set through state rating systems and insurer filings. Clerical work is cheap; roofing is expensive.
• Payroll: estimated at the start of the policy and audited at the end, so your final premium follows your real payroll.
• Experience modification (mod): compares your claims to similar businesses. A mod of 1.0 is average; below 1.0 lowers the premium and above 1.0 raises it. Very small businesses often do not yet qualify for a mod.

A worked example

Here is how the arithmetic works, using made-up rates purely for illustration. Real rates vary by state, class code and insurer.

What the example shows

With an experience mod of 0.90, that $4,900 becomes about $4,410; with a mod of 1.20 it becomes about $5,880. Most policies also add fees, taxes and minimum premiums, and some apply discounts. Notice that the field payroll drives nearly all of the cost. Misclassifying the office manager as a field technician would add about $1,900 a year in this example — which is why classifying each employee correctly matters.

How the year-end audit works

Because workers’ compensation is priced on payroll, the premium you pay at the start of the policy is a deposit based on estimates. After the policy ends, the insurer audits your actual payroll by class code — by mail, phone or a visit — and either refunds the difference or bills you for it.

Audits surprise owners most often in three ways: payroll grew faster than estimated, employees did work in a higher-rated class than shown on the policy, or subcontractors could not show their own workers’ compensation coverage, so their labor was added to your payroll. Keeping payroll records by job type and collecting subcontractor certificates before work starts avoids most of these bills.

How to lower your workers’ comp costs

Most savings come from accuracy and safety rather than shopping alone.

• Classify every employee correctly. Split payroll between class codes where your state allows it and keep records that support the split.
• Estimate payroll realistically. Overestimates tie up cash until audit; underestimates bring a large bill afterwards.
• Keep good audit records, including certificates of insurance from subcontractors, so you are not charged for their payroll.
• Invest in safety training and a return-to-work program; fewer and shorter claims improve your experience mod over time.
• Report injuries promptly. Delayed claims tend to cost more.
• Ask about pay-as-you-go billing, which ties premium payments to each payroll run and smooths cash flow.
• Compare insurers, and in monopolistic states (Ohio, Washington, North Dakota and Wyoming), work with the state fund on available programs.