GST is an indirect tax that is levied on goods as well as services. All the existing state and central indirect taxes are subsumed under the GST. GST levied on supply of goods or services or both at each stage of supply chain starting from manufacture or import and till the last retail level. So basically any tax that is presently being levied by the Central or State Government on the supply of goods or services is Goods and Service Tax.
Another very significant feature of GST is input tax credit will be available at every stage of supply for the tax paid at the earlier stage of supply. This feature would mitigate cascading or double taxation in a major way.
This tax reform will be supported by extensive use of Information Technology [through Goods and Services Tax Network (GSTN)], which will lead to greater transparency in tax burden, accountability of the tax administrations of the Centre and the States and also improve compliance levels at reduced cost of compliance for taxpayers.