RSA 412:34: Schedule Rating.

The commissioner may permit insurers to use appropriate systems of schedule rating filed by any insurer or advisory organization approved by the commissioner, subject to rules adopted under RSA 541-A, to assure the uniform and impartial application of such rating. Such ratings shall be:

I. Based on an employer's safety policies and record, including its policies with regard to injured workers' return to work;

II. No greater than plus or minus 25 percent of the insurer's base rates;

III. Voluntary on the part of both the insurer and the employer; and

IV. Applicable to an annual premium greater than $1,000.