GST registration is a PAN based registration that is done online. It takes around 3-6 working days within which a temporary number (TRN) is generated on time. GST registration is confirmed by the GSTIN (GST identification number) which is provided by the tax authorities to monitor tax payments and compliances of the registered person and it is a unique 15 digit number. In the GST Regime, businesses whose turnover exceeds Rs. 40 lakhs* (Rs 10 lakhs for NE and hill states) is required to register as a normal taxable person. This process of registration is called GST registration. For certain businesses, registration under GST is mandatory.