Finance Minister, Arun Jaitley in his budget speech introduced Long Term Capital Gains tax (LTCG) which will be applicable from April 1, 2018 onward. The LTCG, however, is being grandfathered . The stock highs of January 31 will be used to index the LTCG gains. This means when you sell a stock after April 2018 for price more than the high of the stock price on January 31, 2018, LTCG of 10 per cent will be applicable on the gains, which is exempt for gains uptill Rs. 1,00,000.