Section 452A.55 - Records1. Every person operating within the purview of this subchapter shall make and keep for a period of four years such records as may reasonably be required by the state department of transportation for the administration of this subchapter. If in the normal conduct of the business, the required records are maintained and kept at an office outside the state of Iowa, it shall be a sufficient compliance with this section if the records are made available for audit and examination by the state department of transportation at the office outside Iowa.2. The state department of transportation, within a period of one year from the issuance of a permanent international fuel tax agreement fuel permit or license, may audit the records of the permittee or licensee for the two years preceding the issuance of the permit or license. The state department of transportation shall collect all taxes due had the permittee or licensee been licensed for the two years prior to the issuance of the permit or license and shall refund any overpayment pursuant to section 452A.54. When, as a result of an audit, fuel taxes unpaid and due the state of Iowa exceed five hundred dollars, the audit shall be at the expense of the person whose records are being audited. However, if an audit of records maintained under this section is made outside the state of Iowa in a state which requires payment of the costs for similar audits performed by officials or employees of the other state when made in Iowa, then all costs of audits performed outside of Iowa in the other state shall be at the expense of the person whose records are audited.