E-invoicing under GST does not mean generating invoices on a website. It means reporting your invoices to a government system that validates them and returns a unique reference and code before the invoice is treated as valid. Here's who it applies to, when you have to start, and how the mechanics work in practice.
Reviewed by CA Harika Chebolu, FCA · Last updated 2026-06-15
Quick answer
E-invoicing replaces self-printed invoices with invoices validated on a government portal. Here's who it applies to, when it kicks in, and how the process works.
E-invoicing is a system where you report invoice details to the government's Invoice Registration Portal, which validates them and returns an Invoice Reference Number along with a signed QR code. You still raise the invoice in your own accounting or billing system; the e-invoicing step is the reporting and validation that happens around it. An invoice that should have been reported but was not is treated as not a valid tax invoice, which is why the process matters beyond being a formality.
E-invoicing is mandatory for registered businesses whose aggregate turnover exceeds a prescribed threshold, applied across your operations on the same PAN. The threshold has been lowered in stages over time, progressively bringing smaller businesses into the system. Certain categories are specifically excluded regardless of turnover. Because the threshold has changed more than once and exclusions are category-specific, confirm the current limit and whether you are covered before concluding that e-invoicing does or does not apply to you.
Once your turnover crosses the applicable threshold in any relevant period, e-invoicing applies to you going forward, and the obligation does not fall away in a later low-turnover year. New businesses crossing the threshold need to be ready to start in time rather than after the fact. Because the trigger is turnover-based and the threshold has moved, the safest approach is to monitor your turnover against the current limit and prepare your systems ahead of crossing it, not once you are already over.
In practice, your billing system prepares the invoice in the required format and sends it to the Invoice Registration Portal. The portal validates the data, assigns the Invoice Reference Number, and returns the invoice with a signed QR code, which then forms part of the document you issue. The reported data also flows into the wider GST system, reducing duplicate entry. Most businesses integrate this through their accounting software or a service provider so that reporting happens as part of normal invoicing rather than as a separate manual task.
Beyond the legal requirement, e-invoicing tightens the link between your invoices, your returns, and your customers' input tax credit. Because reported invoices feed into the return system, getting them right at source reduces mismatches and reconciliation effort later. Conversely, failing to report when required can render invoices invalid and create problems for your customers' credit as well as your own filings. Treating e-invoicing as an integrated part of your billing — not an afterthought — keeps the whole compliance chain clean.
No — you still raise invoices in your own system, then report them to the Invoice Registration Portal, which validates them and returns a reference number and signed QR code. The portal handles validation, not the creation of your invoice.
It applies once your aggregate turnover exceeds the prescribed threshold, with some categories specifically excluded. Because the threshold has been lowered in stages, confirm the current limit and whether your business is covered before assuming it does or doesn't apply.
An invoice that should have been reported but wasn't is treated as not a valid tax invoice. That can affect your own filings and your customer's ability to claim input tax credit, so reporting needs to be built into your normal invoicing.
Not sure whether e-invoicing applies to you or how to set it up? Write to the firm and we'll check your turnover against the current threshold and help you get the process running.