Ind. Code § 6-3-1-33
As used in this article, "bonus depreciation" means an amount equal to that part of any depreciation allowance allowed in computing the taxpayer's federal adjusted gross income or federal taxable income that is attributable to the additional first-year special depreciation allowance (bonus depreciation) for qualified property allowed under Section 168(k) of the Internal Revenue Code, including the special depreciation allowance for 50-percent bonus depreciation property.
As added by P.L.105-2003, SEC.3. Amended by P.L.246-2005, SEC.71.