RSA 412:28 Filing and Approval of Rates and Rating Plans.

I. Every insurer, that insures employers against liability for compensation under the workers' compensation law, RSA 281-A, shall file with the insurance commissioner individually or in collaboration with others, in such form as the commissioner may prescribe every manual, minimum premium, class rate, rating schedule, or rating plan and every other rating rule, and every modification of any of the foregoing that it proposes to use; provided, that none of the above shall take effect until the commissioner shall have approved the same as adequate, not excessive, and not unfairly discriminatory.
II. An insurer shall file its rates by filing a multiplier, and, if applicable, other modifications to the prospective loss costs and rating plan filed by the National Council on Compensa