E-Invoicing Under GST: Who Needs It & How to Generate It | Kallapotti Learn

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 E-invoicing is mandatory for businesses above ₹5 crore turnover. Learn how IRP works, the process for generating IRN and QR code, and the benefits of e-invoicing.

  7 min read  Updated 16 September 2026  Ahopez Innovations Team E-InvoiceIRNIRPGSTINQR CodeGST E-invoicing under GST requires eligible businesses to report B2B invoices to the government's Invoice Registration Portal (IRP) in real time, receive an Invoice Reference Number (IRN), and include it on all invoices.

## Who Must Generate E-Invoices?

Aggregate TurnoverE-Invoice Mandatory From> ₹500 Crore1st October 2020> ₹100 Crore1st January 2021> ₹50 Crore1st April 2021> ₹20 Crore1st April 2022> ₹10 Crore1st October 2022> ₹5 Crore1st August 2023## How E-Invoicing Works

- 1 Create the invoice in your billing software (like Kallapotti)
- 2 System sends invoice data as a JSON file to the IRP (einvoice1.gst.gov.in)
- 3 IRP validates, generates a unique IRN (Invoice Reference Number) and QR Code
- 4 IRN is returned to your system and embedded on the invoice
- 5 Invoice is shared with buyer with IRN + QR code printed on it
- 6 IRP auto-populates GSTR-1 — no manual data entry needed
## Key Benefits

-  Auto-populates GSTR-1 — eliminates manual data entry
-  Reduces fake invoices and ITC fraud
-  Buyers can verify invoice authenticity by scanning QR code
-  Faster ITC matching since data flows directly to GSTR-2B
-  E-way bill auto-generated for applicable supplies
 Important E-invoices must be generated with a valid IRN BEFORE goods are dispatched. Failure to generate an e-invoice is treated as issuing an invoice without tax payment, attracting a penalty of 100% of tax due or ₹10,000 per invoice (whichever is higher) under Section 122(1). Exempt sectors: SEZ units, insurance, banking, GTA, passenger transport, and multiplexes.

 ## File GST returns with zero manual work

 Kallapotti generates GSTR-1-ready data, auto-calculates HSN codes, and tracks ITC — all from
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