Certificates Classes 1,2 and 3 Digital Signatures. Class2 Digital Signature Certificate ( DSC ) is required for : * e-filing of Income Tax Return, Sales Tax/VAT Tax Return * e-signing of Form 16/16A * MCA 21 RoC e-filing * LLP Formation * Private Limited/L Company Formation etc. Class 3 Digital Signature Certificate ( DSC ) isrequired for : * e tenders * e procurement * Vendor registrations * DGFT Registration