The Income Tax e-Filing portal (incometax.gov.in) requires Digital Signature Certificates for a wide range of filings — from corporate ITR submissions to tax audit reports. With the new portal having evolved significantly through 2025–2026, here is a comprehensive and up-to-date guide on using DSC for income tax compliance.

Who Must File ITR with DSC?

The Income Tax Act mandates DSC-based filing for the following entities:

  • Companies: All companies (private, public, OPC) must file ITR using DSC
  • LLPs: Limited Liability Partnerships must use DSC for ITR and other filings
  • Individuals with Tax Audit (Section 44AB): Must file ITR and audit report with DSC
  • Chartered Accountants: Must sign Tax Audit Reports (Form 3CA/3CB/3CD) using their personal DSC
  • Company Secretaries and Cost Accountants: Must use DSC for relevant certifications

Proprietors, individuals (non-audit cases), and HUFs may use OTP-based e-verification or DSC — both are accepted.

Features of the New Income Tax Portal (2025–2026 Update)

  • Browser-based DSC signing via emSigner tool (no Java required for most actions)
  • emSigner must be installed on your machine — download from the portal's help section
  • DSC registration under My Profile → Register DSC → Select Certificate → Enter PIN
  • Multiple DSC registration for the same PAN is allowed if an older one expired
  • Revoked or expired DSC must be removed and a new one registered before filing

Common DSC Issues on the Income Tax Portal

  • emSigner not connecting: Ensure emSigner is running as administrator; check firewall settings
  • Certificate not visible: USB token driver not installed — install ePass2003 or SafeNet Authentication Client
  • Name mismatch: The name on DSC must exactly match the name registered in the income tax portal
  • PAN mismatch: For Organisation DSC, the company PAN embedded in the DSC must match the PAN on record
  • Portal timeout: Complete DSC signing promptly — long sessions may time out, requiring re-login

Get DSC for Income Tax Filing

Class 3 DSC for ITR, tax audits, and all income tax portal actions. Issued in 24 hours.

Apply for DSC WhatsApp

For companies and audit cases, ensure your DSC is registered well before the filing deadline. A DSC renewal can be completed in 24 hours, but portal registration and testing may take additional time — plan at least 3 days before the deadline when renewing mid-season.