An amount of Rs.2000/- shall be charged as Luxury Tax annually on all residential buildings having a plinth area of 278.7 m2 or more and completed on or after with first day of April, 1999. The Luxury tax have to be paid in advance on or before the 31st day of Marc, every year. Plinth area under the Kerala Building Tax Act means the area included in the floor of a building and where a building has more than one floor the aggragate area included in all the floors together.