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Digital Signature for Income Tax and GST

The certificate income tax and GST need: who must sign, registering on both portals, fixing emSigner, and why PAN name matching decides it.

Income tax and GST are the two filings most businesses sign every year. Both accept a Class 3 signing certificate, both register it against your PAN, and both fail in the same way when the name does not match.

Tell us what you file and for whom, and we will tell you what to buy.

Any of these lines. Mon-Sat, 9:30 AM - 6:30 PM. Prefer email? info@e-signindia.com.

Which certificate these filings need

Class 3 signing is enough for both. You do not need the signing plus encryption combo unless you also bid on tenders, which is a separate requirement.

One certificate covers both portals. A director who signs the company’s income tax return can register the same certificate on the GST portal — there is no need for a separate tax certificate and a separate GST certificate.

Who has to sign, and who can choose

Income tax e-filing requires a Digital Signature Certificate for:

  • Companies and LLPs, on every return
  • Taxpayers whose accounts are subject to tax audit
  • Political parties, and certain trusts and institutions

Individuals and smaller businesses outside audit can verify with Aadhaar OTP or a bank EVC instead. If you have the option and file once a year, you may not need a certificate at all — we will say so.

GST requires one for:

  • Companies and LLPs, on registration and on returns
  • Foreign companies and non-resident taxable persons

Proprietors and partnerships can generally use Aadhaar-based EVC. Registration itself often forces the issue: applying for GST registration as a company requires a certificate before the application can be submitted.

The PAN name must match

Both portals link the certificate to your PAN. If the name on the certificate differs from the name on the PAN record — a missing middle name, an initial where the PAN has the expansion, surname first instead of last — registration fails and there is no way round it.

Read the name off the PAN card exactly and apply in that form. Correcting it later means reissuing the certificate.

Registering on the income tax portal

  1. Install the driver for your USB token and plug it in.
  2. Log in to the income tax e-filing portal.
  3. Open My Profile and choose the register DSC option.
  4. Enter the email registered against the certificate.
  5. Install and run the portal’s signing utility when prompted — it is the component that reads the token.
  6. Select your certificate and confirm.

Re-register after any renewal. A new certificate, even with an identical name, is a different certificate; the portal will not accept it until it is registered.

Registering on the GST portal

  1. Plug in the token with the driver installed.
  2. Log in to the GST portal.
  3. Open your profile and choose Register / Update DSC.
  4. Select the authorised signatory’s PAN from the list.
  5. Run emSigner, select the certificate and confirm.

The signatory you select has to be someone already added as an authorised signatory on the GST registration. Adding a new signatory and registering their certificate are two separate jobs, in that order.

When emSigner will not work

emSigner is the single most common support call on the GST portal. Work through these in order:

  1. Run emSigner as administrator. It needs to open a local port and will fail quietly without permission.
  2. Start emSigner before you click the signing button, not after.
  3. Allow the local connection. The browser talks to emSigner over 127.0.0.1. Antivirus and firewall software frequently block it.
  4. Check the token is visible to Windows. If Device Manager does not show it, install the driver from the downloads page.
  5. Close other applications holding the token — another portal tab, a CA’s token manager, or a second copy of emSigner.
  6. Check browser settings. Trusted sites and protected mode can block the prompt entirely; the browser configuration guide works through it.

If it still will not sign, call us — we do this over remote desktop most working days and it is usually settled in a few minutes.

It has to be on a FIPS token

Class 3 certificates are issued onto a FIPS 140-2 or 140-3 certified USB token and cannot be copied to another device. If you already hold a working token with a spare slot, a new certificate can often go onto the same one. The USB token guide describes the devices and which are plug and play.

Renewal, and why it always bites in filing season

A certificate expires on a fixed date whether you use it or not, and an expired certificate cannot be renewed in place — a new one is issued and downloaded onto the token again. Then it has to be registered on both portals again.

Filing deadlines and expiry dates have a habit of coinciding. Check the expiry now: the documents and process guide shows how to read it straight from Windows, no special software needed.

Return due and the certificate will not sign? We fix emSigner and portal registration problems over remote desktop every working day. Call +91 89200 56551, +91 120 4321443 or +91 93547 14615, Mon–Sat, 9:30 AM–6:30 PM.

We can file it for you as well

If you would rather hand over the compliance entirely, we handle GST registration and returns, income tax filing, company registration, EPF and ESI and trademark registration.

Any of these lines. Mon-Sat, 9:30 AM - 6:30 PM. Prefer email? info@e-signindia.com.

Digital signatures for income tax and GST

Who has to sign the income tax return with a Digital Signature Certificate?
Companies and LLPs on every return, taxpayers whose accounts are subject to tax audit, and certain political parties, trusts and institutions. Individuals and smaller businesses outside audit can verify with Aadhaar OTP or a bank EVC instead.
Is a Digital Signature Certificate mandatory for GST?
For companies, LLPs, foreign companies and non-resident taxable persons, yes. Proprietors and partnerships can generally use Aadhaar-based EVC. Registering as a company forces the issue, because the registration application itself has to be signed.
Can I use one certificate for both income tax and GST?
Yes. A single Class 3 signing certificate can be registered on both portals. There is no separate income tax certificate and GST certificate.
Why is emSigner not working on the GST portal?
Run emSigner as administrator, and start it before clicking the signing button. It opens a local connection on 127.0.0.1 that antivirus and firewall software frequently block. Also confirm the token appears in Device Manager, close any other application holding the token open, and check the browser’s trusted-site settings.
Why does the portal reject my certificate on registration?
Almost always a PAN name mismatch. Both portals link the certificate to your PAN, so the name on the certificate has to match the PAN record exactly — a missing middle name or an initial where the PAN holds the expansion is enough to fail it.
Do I have to register the certificate again after renewing it?
Yes, on both portals. A renewed certificate is a new certificate even though the name is the same, and neither portal will accept it until it has been registered again.
Which class of certificate do income tax and GST need?
Class 3 signing is enough for both. The signing plus encryption combo is only required for tendering and e-procurement, where bids are submitted encrypted.

Need a Digital Signature Certificate today?

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