Exemption 54 capital gain


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do we have to submit the capital gain in capital gain account before due date or before filling return........ i have been advised by a proffessional that  one can file belated return and delay the deposit of gain into cg account for getting 54 exemotion as belated return steps into the shoes of return under 139(1).. but in my tax vinod gupta book i read that one has to submit in any case before the due date mentioned in 139(1)..

please enlighten me !!!