The petitioner constructed a building and it was completed on 6.12.1995. He filed Ext.P1 returns under the Building Tax Act on 29.12.1995. The Tahsildar called the petitioner for a hearing on 21.8.1996, by Ext.P2 notice dated 8.8.1996. He appeared and the tax was assessed as per Ext.P3 assessment order dated 22.8.1996. The petitioner paid the tax. Later, he was called for a hearing on 5.1.1999 by Ext.P4 notice dated 22.12.1998. He was told that the tax is going to be revised, as the rate of building tax was revised by the Government with effect from 29.7.1996, without knowing that, the assessment was made on 22.8.1996. So, the petitioner was informed of the proposal to revise his tax. Feeling aggrieved by the said stand, the petitioner filed Ext.P5 objection. But, without considering Ext.P5, Ext.P6 proceedings have been issued, revising the tax. The petitioner submits, the taxable event is the completion of the building or occupation of the building, whichever is earlier. Both the events happened in 1995. So, the revision of the rate of tax enforced with effect from 29.7.1996 cannot be made applicable to his building.