Info about the service tax

Q: Hi,I got a quick question, A quick search reveals different answers from different forumMy question is i bought an under construction apartment in April 2010, I paid about Rs 5 Lakhs before 1 July 2010, Now apartment is ready for possession(Completion certificate of an Apartment should be 2012) , My question is whether i need to pay service Tax on entire amount or have to pay after deducting 5 Lakh?Currently i have to pay Rs 80000 as a service Tax however if i deduct Rs 5lakh from total Cost of Apartment(Nearly 40 lakh) i would save approx Rs 10000Please confirm if i have to pay Service Tax(Approx 4.2 %) on Total value of an apartment or after deducting Money which was paid before 1 July 2010?RegardsShobhit