Register DSC on the income tax e-filing portal with emBridge: steps and common errors

When you need a DSC on the e-filing portal

The e-filing portal's FAQ says a DSC is mandatory for some services and users — for example, e-verification of returns filed by companies and political parties, and by other persons whose accounts must be audited under the Income Tax Act. For others it is optional. Before you can sign anything with a DSC, you must register it on the portal. A Class 2 or Class 3 DSC you already use for another application works too, as long as it hasn't expired or been revoked.

What you need

• a registered e-filing account (user ID and password);
• a Class 2 or Class 3 DSC on a USB token obtained from a Certifying Authority, linked to your PAN (or, for a non-resident director of a foreign company, to an e-mail ID);
• the token's own driver or token tool installed and running;
• emBridge, the portal's signer utility. Get it from Home → Downloads → DSC Management Utility → Utility (emBridge); the Windows download is "Windows Utility.zip".

Register the DSC: step by step

These steps are from the portal's *Register Digital Signature Certificate* user manual.

1. Extract "Windows Utility.zip", install emBridge, start it and keep it running.
2. Plug in the DSC token. The department's guidance is to have emBridge running before you plug the token in, and the token's application running too.
3. Log in to the e-filing portal with your user ID and password.
4. Click your name at the top right of the dashboard, then My Profile.
5. Click Register DSC on the left of the profile page.
6. Confirm "I have downloaded and installed emsigner utility" and click Continue.
7. Select the Provider and Certificate, enter the Provider Password (your token PIN) and click Sign.
8. A success message appears, with an option to go to the dashboard.

Re-registering

• Your registered DSC has expired: after step 5 the portal shows "Your Registered DSC has already expired. Please re-register a valid DSC". Follow the same steps with the new certificate.
• Your registered DSC is still valid but you have a new one: the portal shows "You have already registered DSC". Click View to see the old one, or the click here link to register the new DSC.
• The old token is lost or the portal won't let you move on: the department's DSC webinar (October 2023) describes raising a grievance on the portal asking to de-register the old DSC — for example, "Old DSC has expired". An Income Tax officer approves it and you get an e-mail, after which you register the new DSC.

Fixing the common errors

"The Digital Signature Certificate is already registered" — a DSC can't be registered by more than one user, so it may already be registered against another taxpayer. Check that the DSC is yours. The exception is a Principal Contact, who may use the same DSC for both their individual and the organisation's verification.

"Certificate mismatch" when e-verifying for a company — for a corporate PAN, the DSC must be linked to the Principal Contact's PAN and registered from the Principal Contact's own login. The DSC registered and the DSC used for e-verification must be the same.

A new authorised signatory, but the old person's PAN still appears — log in with the corporate PAN, go to My Profile → Key Person details, add the new key person and Appoint as Principal Contact. The new Principal Contact then logs in and registers their DSC.

"Something went wrong" during e-verification, or empty drop-downs — the department's steps: uninstall emBridge, download and install the latest version, follow the troubleshooting guidance in the emBridge installer, then delete the certificate in your token tool and import it again. If the drop-downs stay empty, contact your certificate provider — the certificate might be corrupted.

Token not detected — start emBridge first, then plug in the token and make sure the token's application is running. If both are running and it still isn't detected, restart the PC, delete and re-import the certificate in the token tool, and contact your certificate provider if needed.

Your token PIN and expiry date

The portal FAQ explains that the DSC PIN is the password for your token. Every token comes with a default PIN, and you can change it through the token's driver software once the token is plugged in. To check when your DSC expires, open the token tool and look under Certificate Details → Validity Period.

Related

For GST signing, see our GST Register DSC guide. If your token was issued after 21 September 2026, read about FIPS 140-3 tokens. The emBridge download is linked from our DSC Management Utility page.