Under the present GST regime, every individual or company that supplies goods and services has to register under Goods and Service Tax (GST). So, if you run a business with an annual turnover that exceeds Rs.40 Lakhs in case of goods and 20 Lakhs in case of services then you will have to register with GSTN (Goods and Service Tax Network).
Once you have registered under this regime, you will receive a unique GSTIN (Goods and Service Tax Identification Number). The Central Government issues a state-wise, 15-digit number to you once you complete registration. There are many advantages of GST registration including the fact that you will get a legal identity as a supplier. You can also avail input tax credit and collect GST from recipients of goods and services.