Iowa Code § 322.18
If dual-interest insurance on the motor vehicle is purchased by the holder it shall, within thirty days after execution of the retail installment contract, send or cause to be sent to the buyer a policy or policies or certificate of insurance, written by an insurance company authorized to do business in this state, clearly setting forth the amount of the premium, the kind or kinds of insurance and the coverages. The buyer shall have the privilege of purchasing such insurance from an agent or broker of the buyer's own selection and of selecting an insurance company acceptable to the holder; but in such case the inclusion of the insurance premium in the retail installment contract shall be optional with the seller. If any insurance is canceled, unearned insurance premium refunds received by the holder shall be credited to the final maturing installments of the contract except to the extent applied toward payment for similar insurance protecting the interests of the buyer and the holder or either of them.
Iowa Code § 322.18