156.7.1. A taxpayer, other than a trust, may deduct, in computing the taxpayer’s income from a business for a taxation year, an amount equal to 85% of the aggregate of all amounts each of which is an amount deducted by the taxpayer in computing the taxpayer’s income for the year under paragraph a of section 130 or the second paragraph of section 130.1, in respect of the taxpayer’s prescribed depreciable property.