E-invoicing sounds complicated, but it is really just a system where certain businesses must report their B2B invoices to a government portal and get them digitally authenticated before they are valid. Here is who it applies to and how it works.
What e-invoicing actually is
Under e-invoicing, you do not “create the invoice on a government website.” You generate your invoice in your own software as usual, then upload the details to the Invoice Registration Portal (IRP). The IRP validates it and returns:
- A unique IRN (Invoice Reference Number) — a 64-character hash
- A digitally signed version of the invoice
- A QR code
You then print the IRN and QR code on the invoice you give your customer. Only an invoice with a valid IRN is treated as a legal tax invoice for businesses covered by e-invoicing.
Who must generate e-invoices?
E-invoicing applies based on aggregate annual turnover. The threshold has been lowered in stages:
| Phase | Turnover threshold |
|---|---|
| Oct 2020 | ₹500 crore |
| Jan 2021 | ₹100 crore |
| Apr 2021 | ₹50 crore |
| Apr 2022 | ₹20 crore |
| Oct 2022 | ₹10 crore |
| Aug 2023 | ₹5 crore |
What e-invoicing applies to
E-invoicing (for covered businesses) applies to:
- B2B invoices (supplies to registered persons)
- Exports
- Credit and debit notes issued to registered persons
It currently does not apply to B2C invoices, though covered businesses may still need a dynamic QR code on B2C invoices under separate rules.
Who is exempt
Some categories are exempt from e-invoicing regardless of turnover, including:
- Banks, financial institutions and NBFCs
- Insurance companies
- Goods Transport Agencies (GTA)
- Passenger transport services
- Cinema and multiplex admission services
- SEZ units (note: SEZ developers are covered)
E-invoice vs e-way bill
These two are often confused:
| E-invoice | E-way bill | |
|---|---|---|
| Purpose | Authenticate a B2B invoice (get IRN) | Permit movement of goods |
| Trigger | Turnover-based, on B2B supply | Consignment value over ₹50,000 |
| Output | IRN + signed invoice + QR | E-way bill number (EBN) |
| Applies to | Goods and services | Movement of goods |
Helpfully, if you are on e-invoicing, the e-way bill can be auto-generated from the e-invoice data, reducing duplicate entry.
Why e-invoicing exists
The goal is to curb fake invoices and mismatched ITC. Because each covered invoice is registered with the IRP in real time, the data flows automatically into your GSTR-1 and the buyer’s records, reducing reconciliation errors and fraudulent credit claims.
What this means for a small business
If your turnover is below the current threshold, e-invoicing does not apply — you issue normal GST tax invoices. But keep an eye on your turnover: the threshold has fallen steadily, and once you cross it, you must start generating IRNs for all covered supplies. Preparing early — using software that can integrate with the IRP — avoids a scramble later.
The bottom line
E-invoicing means reporting your B2B invoices to the IRP to obtain an IRN and QR code. It currently applies above ₹5 crore turnover, covers B2B/exports/credit-debit notes, and is separate from the e-way bill. Verify the current threshold, because it only ever comes down.
For a complete overview of GST invoicing, registration and returns, read the full GST Guide for Small Businesses.