بسم الله الرحمن الرحيم
(Fatwa: 1257/1241/B=1/1438)
The interest based loan brings loss, curse and misfortune. You should not have taken interest based loan. In the above mentioned case, no zakah shall be wajib on that fifteen lakh which is in your hand.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
