Experience rating in outline: how claims costs move a contractor's premiums over time
A drywall contractor sees a surcharge on the coming year’s rate notice. The owner blames one claim from three years ago and asks the superintendent whether an earlier return would have removed the increase.

Experience rating compares claims costs relative to payroll with the industry rate-group average, using costs from the past three years. It can adjust the industry base premium rate through a discount or surcharge. The actual notice shows the base rate, experience adjustment and net rate. Prevention and safe recovery efforts can improve future results, but a remembered claim or hypothetical return date cannot establish what a particular notice would have been.
Check the requirement against the actual work
- Start with the actual notice and year. Obtain the correct notification from the authorized account holder and record which business and classification it covers. Separate preliminary information from the received final notice. Identify the base rate, adjustment and resulting net rate before discussing causes. Do not compare a total invoice with last year’s rate as if they were the same measure.
- Gather the claims and payroll information behind it. Ask the account owner to obtain the relevant detail and explanation through the regulator’s services. Record the period and data used in the actual calculation. Keep questions about inclusion or changes specific. A claim remembered by the owner may be important, but memory alone cannot establish its treatment in this particular assessment.
- Separate the different changes. Compare the notice with the corresponding prior information and identify which entries moved. Ask about unexplained differences instead of assigning the whole movement to one injury. Distinguish rate questions from changes in the business’s payroll or activities. This lesson does not calculate a future premium, reproduce every rating exception or supply a substitute for the actual account determination.
- Choose improvements from evidence about work. Review actual injury circumstances, recurring tasks and return-to-work arrangements with the responsible people. Give each proposed improvement a purpose and implementation check. Help injured workers through safe, suitable arrangements rather than pushing an earlier date for the budget. Do not discourage reports or treat fewer reports alone as proof that hazards have been controlled.
- Explain findings with their limits. Give the owner a short record of the notice, data checked, regulator answers and outstanding questions. Label any forecast as an estimate with stated assumptions and its proper source. Keep the prevention action record beside the financial explanation. Do not promise that one improvement will produce a particular discount or erase an existing surcharge.
Common mistakes
- Blaming a remembered claim without checking the calculation.
- Comparing an invoice total directly with a rate.
- Pressuring a worker’s return to meet a premium target.
Checklist
Make the rate explanation traceable
- Correct notice, business and assessment year.
- Base rate and experience adjustment separated.
- Actual claims period and payroll information checked.
- Unexplained entries referred for clarification.
- Prevention and safe recovery actions given owners.
Check your understanding
Can the superintendent say that returning the worker two weeks earlier would have eliminated the surcharge?



