Any IRC §168(k) bonus depreciation claimed on a taxpayer's federal return will not be allowed for MBT purposes. Taxpayers should re-compute MBT depreciation using a federally accepted depreciation method that computes a depreciation amount as if IRC §168(k) was not in effect. This depreciation method must be used consistently over the life of the asset until retired or disposed of when computing MBT business income. The federal depreciation expense that is calculated as if §168(k) was not in effect is the deduction used in calculating MBT business income. A taxpayer must keep sufficient records to track the basis of the asset and depreciation deduction claimed for purposes of the MBT.