Iowa Code § 384.10: Short-term loans.

A city may negotiate short-term loans, and may issue warrants as provided in chapter 74, in anticipation of and not in excess of its estimated revenues for the current fiscal year. However, natural disaster loans from the state or federal government and loans for projects where payment of state or federal funds has been guaranteed but receipt of such funds may not coincide with the fiscal year, may be negotiated in anticipation of revenues for a period of time longer than the current fiscal year.