Iowa Code § 450.49: Bonds — conditions.

All bonds required by this chapter shall be payable to the department of revenue and shall be conditioned upon the payment of the tax, interest, and costs for which the estate may be liable, and for the faithful performance of all the duties hereby imposed upon and required of the person whose acts are by such bond to be guaranteed, and shall be in an amount equal to twice the amount of the tax, interest, and costs that may be due, but in no case less than five hundred dollars, and must be secured by not less than two resident freeholders or by a fidelity or surety company authorized by the commissioner of insurance to do business in this state.