If you are incurring a long term capital loss on selling shares or equity mutual fund units then it may be better to sell after 31.3.2018 as then you would be able to set them off against any LTCG which you may get as LTCG will become taxable after this date. While you should sell equity and equity MF units before March 31, 2018 to get tax-exempt long term capital gains you should sell after this date if you are going to incur long term capital losses (LTCL).
75 years to reach per capita income of $2730, will take only 5 years to add another $2000, FM Sitharaman
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