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MProfit takes into account effective purchase date of a demerged new company, same as the date of purchase of the parent company while computing capital gains. It is as per the income tax rules.
Attached please find the document named 'How to Compute Capital Gains' published by Income Tax Department. The law contained in this publication is as per Income tax Act, 1961 as amended by Finance Act 2010.
Please check the section 'Period of Holding' on page 16,
vi) where the capital asset is share(s) in an Indian company which has become the property of the assessee in consideration of a demerger, the period for which the share(s) of the demerged company were held should also be considered.