Iowa Code § 24.8: Estimated tax collections.

The amount of the difference between the receipts estimated from all sources other than taxation and the estimated expenditures for all purposes, including the estimates for emergency expenditures, shall be the estimated amount to be raised by taxation upon the assessable property within the municipality for the next ensuing fiscal year. The estimate shall show the number of dollars of taxation for each thousand dollars of the assessed value of all property that is assessed.