Petrol,Disel,alcohol and to name a few are not in the GST purview. The above mentioned commodities constitutes almost one-third of state governments revenue pie. (These items actually generates 35% to 50% tax outside the GST ambit)If these commodities comes under GST ,then according to present GST rates ,government can impose maximum 28% tax to bound to GST rules. This action would definitely bring down state governments revenue to abysmal low,which would have adverse implications on states prosperity. To avert this menace central government has opted not to include the aforesaid item's in the GST tax slabs.