As per AS 10 software which is not an integral part of computer should be classified as an intangible asset and amortised under AS 26. Now where a company which classified tally software as computer in earlier years and provided depreciation thereon, now wants to treat tally software purchsed during the year as an intangible asset. Is it permissibile to apply this accounting treatment prospectively and not retrospectively? Will it not amount to change in accounting policy?