I have purchased a flat at Kolkata in October,2016. Now builder asking for 3.75 percent service tax on total value of this flat.My questions are 1) Is service tax on under construction building applicable in Kolkata. 2) if service tax need to pay then how can I calculate. 3) if service tax need to pay what is the time limit to pay the same to builder. Experts, please comment/valuable suggestion will be appreciated.