Amendment to section 80L reduces deduction thresholds and allows an additional deduction for unallowed specified incomes. Amendment to section 80L reduces the deduction thresholds in clauses (1) and (2) effective 1 April 1997 and inserts a proviso allowing an additional deduction for income referred to in clause (iv), clause (v) or clause (va) that remains unallowed after the primary deduction, subject to a statutory ceiling on that additional deduction when computing total income.