Registered under Old Law
A person was registered under any previous law of indirect tax like service tax, sales tax, excise etc., which got submerged into GST is required to migrate to the new GST regime and obtain the registration with effect from the appointed date, i.e 1st July 2017
GST registration is compulsory irrespective of the turnover of the business, in case the person is making interstate supply and is a casual taxable person, or those need to pay tax on RCM, Non-Resident taxable person, Input Service Distributor, E-commerce Operator, etc..
Turnover exceeds 10/20Lakhs
In case the aggregate supply of goods or services of a person is more than Rs. 20 lakhs (10 lac in the north-eastern state) under one PAN. The said person need to apply for GST registration immediately and start collecting GST on all outward supplies.