All the businesses registered under GST are given a unique identification number known as GST Identification Number or GSTIN. It is same as the TIN number provided to businesses under the state VAT system or the service tax registration number assigned by the CBEC.
Since all these taxpayers will be registered under a single platform in GST, it is convenient to assign them unique ID numbers for identification purpose. The government has established the GST Network (GSTN) to provide the proper IT infrastructure to manage the return filing and other digital operations of the new tax system. Many people are still not fully aware of the GST registration process and about GSTIN.