Section 431:5-301 - Unearned premium reserve(a) Every insurer shall maintain an unearned premium reserve on all policies in force for: (1) Insurance against loss or damage to property, except as provided in section 431:5-302;(2) General casualty insurance;(3) Accident and health or sickness insurance, except as provided in section 431:5-303 and section 431:5-307; and(b) For purposes of this article, "unearned premium reserve" means the portions of the gross premiums in force, less authorized reinsurance.(c) All reserves may be computed, at the insurer's option, on a monthly or more frequent, pro rata basis.(d) After adopting any one of the methods for computing such reserve, an insurer shall not change methods without the commissioner's approval.L 1987, c 347, pt of §2; am L 1997, c 368, §4; am L 2003, c 212, §39 .