It comes under software business, so Modi will definetely make GST for Bitcoin too. I think it would be 18% tax, but still I am not sure.

I already had GST for offline business and they made arise from 5% to 18%.

On localbitcoins.com also we need to pay 7 to 9% as some said yesterday here in this forums and the GST might applied.
How about for Paypal? if they have GST for Paypal then yes for Bitcoin too or no.