Extracts of sec 54
(1) Subject to the provisions of sub-section (2), where in the case of an assessee being an individual or a Hindu undivided family, the capital gain arises from the transfer of a long-term capital asset, being buildings or lands appurtenant thereto, and being a residential house, the income of which is chargeable under the head "Income from house property" (hereafter in this section referred to as the original asset), and the assessee has within a period of one year before or two years after the date on which the transfer took place purchased, or has within a period of three years after that date constructed, a residential house, then, instead of the capital gain being charged to income-tax as income of the previous year in which the transfer took place it shall be dealt with in accordance with the following provisions of this section, that is to say, - (i) If the amount of the capital gain is greater than the cost of the residential house so purchased or constructed (hereafter in this section referred to as the new asset), the difference between the amount of the capital gain and the cost of the new asset shall be charged under section 45 as the income of the previous year;