GST is an indirect tax that subsums Central and state taxes and it will make India a unified market. GST is a single tax on supply of goods and services to replace the multiple taxes at various points.
After the implementation of GST you don't have to pay central excise duty, additional excise duty, service tax, additional customs duty, special additional duty of customs, state value added tax, entertainment tax, purchase tax luxury tax, taxes on lottery betting and gambling etc.
The main purpose of GST is to curb tax evadion in a country where small traders businesses routinely evade tax by not creating invoice for goods sold.
GST is expected to be as disruptive as the recent demonetization move, which was touted as a drive against black money but ended up hurting the country's growth in the final quarter (it fell from 7.1 to 6.1 percent) of financial year 2016-2017.
