You will have to pay tax for the Bitcoins you own. You calculate the tax looking at the INR/BTC value. You are paying tax because Bitcoin is considered as an asset. Correct me if I am wrong!
If you have bought bitcoins, you don't have to pay tax unless you sell them and realize a gain.
On the other hand, if you have earned bitcoins, you have to pay tax.
Thank you for correcting. As far as I have read/understood, even if Bitcoin is bought, you will have to pay the tax because it is an asset. Can you please point me to right direction if I am wrong? Please give a reference too(if possible).