Abstract: A computer system and method for a lessor to determine correct use tax on moveable equipment which may be subject to tax by more than one tax authority comprising inventory records for each individual item of equipment comprising an equipment identifier, equipment category, acquisition cost, depreciation, net book value, and branch; updating the inventory records to reflect each modification, improvement, disposition, and change in equipment category, and use tax paid; activity records comprising each lease event pertaining to each item of equipment; and a set of tax rules, which are periodically updated, for each taxing authority where any of the items of equipment may be leased or used, comprising sets of formulas reflecting relationships between tax due and acquisition of equipment, first leasing of equipment, subsequent leasing of equipment, length of lease term, age of equipment, and/or equipment categories.