GST is a single tax on the supply of goods and services, right from the manufacturer to the consumer. Credits of input taxes paid at each stage will be available in the subsequent stage of value addition, which makes GST essentially a tax only on value addition at each stage. The final consumer will thus bear only the GST charged by the last dealer in the supply chain, with set-off benefits at all the previous stages.
Goods & Services Tax is a comprehensive, multi-stage, destination-based tax that will be levied on every value addition.
There is one more term we need to talk about in the definition – Destination-Based. Goods and Services Tax will be levied on all transactions happening during the entire manufacturing chain. Earlier, when a product was manufactured, the centre would levy an Excise Duty on the manufacture, and then the state will add a VAT tax when the item is sold to the next stage in the cycle. Then there would be a VAT at the next point of sale.
So, earlier the pattern of tax levy was like this: