I found following link related to VAT for flats bought from 2006-10. We have to pay approx 1-1.5 Lacs to builder. So, it is very very crucial point/topic of discussion and we should discuss about it.
From TOI:
http://epaper.timesofindia.com/Default/Scripting/ArticleWin.asp?From=Archive&Source=Page&Skin=TOINEW&BaseHref=TOIPU/2012/08/11&PageLabel=5&EntityId=Ar00500&ViewMode=HTML
We should think about it and come to some collective common decision.