Deductibility of zero-coupon bond discount and banking cash transaction tax permitted under section 36, subject to prescribed definitions. Amendment to section 36(1) allows deduction for the pro rata amount of discount on a zero coupon bond calculated by reference to the bond's period of life, with defined meanings for discount, period of life and infrastructure capital entities; it also permits deduction for banking cash transaction tax paid by the assessee on taxable banking transactions, with those terms defined by reference to Chapter VII of the Finance Act, 2005.