e-Invoicing DSC Setup: Threshold Changes for FY26

e-Invoicing under GST is now mandatory for taxpayers above the current threshold — for FY26 planning, the practical answer for most Bangalore SMEs is: if your turnover crossed the notified limit in any preceding year, you're in scope, whether you print invoices or not. Here is the DSC piece.

Do you need a DSC to raise e-invoices?

For companies and LLPs, yes — the Invoice Registration Portal (IRP) requires DSC-signed uploads. For proprietors, EVC (OTP) is allowed but DSC is faster if you generate volume.

Which DSC

• Class 3 Organisation DSC in the company's name — recommended.
• Class 3 Individual DSC of the authorised signatory — acceptable, but the invoice audit trail is cleaner under Organisation.

Registering the DSC on the IRP

1. Log in to the e-Invoice portal with your GSTIN.
2. Go to Update → Register DSC.
3. Select the certificate from emSigner, sign the request.
4. Test with a single invoice upload before you cut over the whole billing engine.

Common signing errors

• "Invalid signature" — the DSC's PAN doesn't match the GSTIN's PAN. Reissue the DSC.
• "emSigner not detected" — the local utility isn't running, restart it.
• "Digest mismatch" — the invoice payload was altered after signing; usually a client-library issue in your ERP.

We help Bangalore GST filers test IRP + ERP integrations after a fresh DSC install — book a screenshare via the contact page.