Q:Recently I booked a flat which costs Rs Y and paid two installments total Rs X say. The builder sent me a receipt with a service tax added on Down payment @ Rs X*3.09%. This is exclusive of the overall tax charged for Rs Y*3.09. My question is if I am paying tax for overall cost at Rs Y*3.09%, is it even legal to charge tax on down-payment amount? Does this mean I have to pay tax for the entire amount i pay @3.09% above the tax of Rs Y*3.09%? Please advice.