in case of a product supply chain.....
manufacturer, wholesaler, retailer, consumer will be present,
right now manfacturer levies central excise, service tax, VAT, CST in order to supply to whole saler,
after all these taxes the cost if product to wholesaler will be 140( for example) and next when it reaches to consumer it has a great increase ( even after existing input credit mechanism)
now GST will be a single tax rate, will come and tax rate might be 18% for example then the total cascading effect will reduce to the maximum extent
and in india logistics is a very important business but however indian average of logistics is only 260 kms per day when compared with america and europe it is far less.
as logistics while moving from one state to another there are huge complainces as per the existing tax structure, GST removes those things
3) previously CST is not allowed for credit with which we have to pay more Tax now IGST is creditable and can be taken as input credit for adjustment on supply
4) VAT is not normal it will change from state to state, SGST also will have changes but the processes overall will be same
5) previously business persons has to file returns for central excise seperately, service tax, entertainment tax, VAT seperately now file CGST return to centre and SGST to state its fine
6) a single tax structure gives a better control and governance rather than monitoring multiple indirect taxes.