I purchased the residential flat from a builder ( A registered partnership firm) for Rs.36,00,000 as per sale deed. But as per agreement of sale value for that flat is 48,00,000/-. I got bank loan for Rs.40 lakhs . I also paid Rs. 8 lakhs to the builder as per sale agreement . My question is on which amount i have to pay G S T to the builder i.e., either sale deed value of Rs. 36 lakhs or Sale agreement amount of Rs.48 lakhs. Kindly explain me.