Service tax on underconstruction flat and st wef ?

Unknown (Sr) (47 Points)

07 July 2013  
Hi, I have purchased underconstruction flat in sept 2011, At the time of agreement Builder was not asked about Service Tax but Now in June 2013 he is asking for Service Tax with Inerest from the date of agreement. My question is As per my knwoladge Service tax on construction is wef 1 july 2012. So In this should i need to pay ST for 2 yr from the date of agreement or 1 yr. from the date ST applicable... Also At the time or after 2 yrs of the agreement builder does not inform about Service tax, sudden he is asking for Interest, Kindly suggest should i need to pay interest of tax or not. kindly suggest what action i need to take, How do i need to handel this situtaton. Pls guide me through. Thanks.