Iowa Code § 515C.4
For the protection of the people of this state and for the purpose of protecting against the effect of adverse economic cycles, the company shall establish a contingency reserve. The company shall annually contribute fifty percent of the earned premiums to this reserve. The earned premiums so reserved may be released annually after the period of time required by the commissioner, provided that said time shall not be less than one hundred twenty months. However, subject to the approval of the commissioner, this reserve may be available only for loss payments, when the loss ratio (incurred losses to premiums earned) exceeds twenty percent. This amount so used shall reduce the next subsequent annual release to surplus from the established contingency reserve.
Iowa Code § 515C.4