l"he appellant ( assessee) was a company carrying on the business of general insurance. It erected a substantial modern building at a cost of about Rs. 12.00.000 towards the end of 1952. For the accounting year 1953 it wrote off a sum of about Rs. 1,00,000 as representc ing ~he depreciation with respect to various items. The Income-tax Officer disallowed 4/ 5 of the depreciation on the ~i:ound that only a fifth part of the building was utilised for the purpose of the appellant's business and the remaining 4/ 5 part was let out. and that the rent thereon was exempted under s. 4(3) (xii) of the Income-tax Act. 1922. On appeal by the assesscc, the Appellate Assistant Con1missioner dismissed the appeal and enhanced the assessment by disallowing even the 1/5 of the depreciation allowed by the Income Tax Officer, on the ground D that under r. 3 (b) of the Schedule to the Act, the allowable depreciation was an actual depreciation of the value of the assets. On furthe1 appeal, the Appellate Tribunal restored the order of the lncon1c·ta': Officer with respect to 115 part but as to the 4/5 part agreed with the Appellate Assistant Commissioner. The High Court, on a reference as to whether the 4/5 part of the depreciation w-as also <sllo\.·ahlc as a deduction in the assessment completed under s. 10(7) unJ the rule-; contained in the Schedule, of the Act, held against the appellant. On E appeal to the Supreme Court,