Deduction disallowance for specified equity shares: transitional rule bars related tax deductions across pre and post transition assessment years. Where the cost of the specified equity shares has been taken into account for the purposes of clause (a) or clause (b) of sub section (1), a deduction with reference to such cost shall not be allowed under the legacy deduction provision for any assessment year ending before 1 April 2006, and shall not be allowed under the investment deduction provision for any assessment year beginning on or after 1 April 2006.