Iowa Code Title XIII. Commerce [Chs. 505-554D] § 515A.3. Making of rates

a. Rates shall not be excessive, inadequate, or unfairly discriminatory.

b. Due consideration shall be given to past and prospective loss experience within and outside this state; to catastrophe hazards; to a reasonable margin for underwriting profit and contingencies; to dividends, savings, or unabsorbed premium deposits allowed or returned by insurers to their policyholders, members, or subscribers; to past and prospective expenses both countrywide and those specially applicable to this state; and to all other relevant factors within and outside this state.

c. The systems of expense provisions included in the rates for use by any insurer or group of insurers may differ from those of other insurers or group of insurers to reflect the requirements of the operating methods of any such insurer or group of insurers with respect to any kind of insurance, or with respect to any subdivision or combination thereof for which subdivision or combination separate expense provisions are applicable.

d. Risks may be grouped by classifications for the establishment of rates and minimum premiums. Classification rates may be modified to produce rates for individual risks in accordance with rating plans which establish standards for measuring variations in hazards or expense provisions, or both. Such standards may measure any differences among risks that can be demonstrated to have a probable effect upon losses or expenses.