E-invoicing basics: invoice, IRN and QR code

GST e-invoicing is not simply creating a PDF on a website. It is a process for reporting specified GST documents to an authorised Invoice Registration Portal and receiving an IRN and signed QR code where the mandate applies.

What happens in the flow

A business usually creates invoice data in its accounting, billing or ERP system. When e-invoicing applies, the required document data is reported to an authorised IRP. The portal validates key fields, generates an Invoice Reference Number (IRN), digitally signs the payload and provides a QR code. Your own system can then produce the customer-facing invoice.

Do not confuse an e-invoice with an ordinary electronic invoice

A PDF invoice sent by email may be electronic in the everyday sense. GST e-invoicing has a specific compliance meaning. Applicability depends on current notifications and facts about the taxpayer and transaction. Check the official portal and take tax advice instead of using an old turnover threshold from an online post.

Example: A billing system can create a draft invoice with customer and item details. If e-invoicing applies, the workflow still needs the required IRP reporting and resulting IRN/QR-code process before the business treats it as a compliant e-invoice.

Operational controls that matter

Use the Invoice GeneratorRead the GST invoice checklist

Sources and further reading

General information only. Confirm applicability, timing and compliance details with a qualified tax professional.