A valid class 2 digital signature is required for GST registration and GST filing in India. Under GST, all documents submitted to the Government including GST registration applications or documents uploaded to the GST common portal must be digitally signed. Class 2 digital signature certificate basically used for individual purposes, such as tax filing, pf submission, GST filling, ITR submission, etc. It is used even tender bidding personally into the e-Procure department.