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:

1. I. Based on an employer's safety policies and record, including its policies with regard to injured workers' return to work;
2. II. No greater than plus or minus 25 percent of the insurer's base rates;
3. III. Voluntary on the part of both the insurer and the employer; and
4. IV. Applicable to an annual premium greater than $1,000.

Source. 2003, 150:1, eff. Jan. 1, 2004. 2023, 214:4, eff. Oct. 3, 2023.