(1)Where a company incurs any expenditure (not being expenditure in the nature of cost of any land or building) on any skill development project notified by the Board in this behalf in accordance with the guidelines as may be prescribed, then, there shall be allowed a deduction of a sum equal to one and one-half times of such expenditure :Provided that for the assessment year beginning on or after the 1st day of April, 2021, the provisions of this sub-section shall have effect as if for the words "an amount equal to one and one-half times of", the words "a sum equal to" had been substituted.