I have one bill ..In that Vat is calculated on service Tax. For e.g. the basic Amt of the bill is 50000/- on that 12.36% service tax has been calculated i.e.= 6180/- & vat is calculated on (5000+6180=56180*5%) =2809. So gross Amt is = Rs.58989/-..Pls guid me weather its right ..Can tax be calculated on tax..Or should I ask the vendor to revise the bill.