GST on Flat purchase 18%?

This query is : Resolved

Madhusudhan Parlathaya (Querist)
Follow

29 July 2024 I had purchased residential flat in Bangalore recently . The flat was worth of 56 lakhs all payments were cleared. After few months builder called and asking for GST on it.

He says its 18% GST as it is a under construction flat.
There is no Possession certificate, but electricity connection was obtained . As per builder electricity connection to flat itself is the possession certificate.

I had paid 31 lakhs out of 56 lakhs before electricity connection .

is it liable to pay 18%GST on it?
First of all is the GST 18% valid for residential under construction flats?