balloon levy
n.— «A balloon levy is a term used to describe the practice of requesting more money than we reasonably expect to receive.…This is done because the equalized assessed value of the district is unknown, but the levy needs to be filed by the last Tuesday in December.» —“District sets levy high in effort to capitalize on unknown EAV ” by Heidi Terry-Litchfield Morris Daily Herald (Illinois) Nov. 29, 2007. (source: Double-Tongued Dictionary)