What if the JV project initiated in 2016 and completion certificate received before 31st March 2019 and handing over to customers happens in June 2019.. There are unsold flats of Land owner on the completion date in march which got sold after 1st April as immovable property without GST and reversed proportionate ITC in books/returns. Now what is the GST on construction service to be calculated payable by Land owners and at what rate.