Sometimes you can just smell when a workers compensation experience mod is wrong. Check out the one I was just reviewing for an Illinois employer.
Payroll on an experience mod should reflect the work comp premium audit numbers. Little bit of a coincidence that the payroll on this experience mod is exactly the same for two years in a row. AND, how many times does the payroll in each of your workers compensation classification codes end with 000.
If your actual payroll turned out to be higher than the estimated payroll at the beginning of the policy period, you could be missing out on a better experience mod credit when these errors are missed.