E-invoicing under GST has quietly expanded to cover a huge share of India's exporting businesses. If your turnover has grown in the last couple of years, it's worth confirming whether you're now required to generate e-invoices — because getting this wrong doesn't just risk a penalty, it can invalidate your export invoice entirely.
EXPWP means export with payment of IGST and EXPWOP means export without payment of IGST, under an LUT; these are the supply types on an export e-invoice. In 2026, GST e-invoicing is mandatory for every business whose aggregate turnover has exceeded ₹5 crore in any financial year since GST began, and it covers export invoices too. Export invoices are tagged EXPWP (export with payment of tax) or EXPWOP (export without payment of tax). Businesses with turnover of ₹10 crore or more must report invoices to the IRP within 30 days of the invoice date, or no IRN is generated.
The Current e-Invoicing Threshold
As of 2026, e-invoicing is mandatory for any GST-registered business whose aggregate annual turnover has exceeded ₹5 crore in any financial year since GST was introduced — not just your current year's turnover. This is a crucial detail: once your turnover crosses ₹5 crore in any single year, the obligation applies going forward permanently, even if turnover dips in a later year. The threshold applies on a PAN basis, meaning it covers your total business turnover across all GST registrations under that PAN.
Does This Apply to Export Invoices Too
Yes. E-invoicing covers B2B, export, SEZ, and deemed-export supplies once you cross the threshold — it isn't limited to domestic B2B transactions. Export invoices are tagged with a supply type of EXPWP (export with payment of tax) or EXPWOP (export without payment of tax), with shipping bill details captured separately in the invoice data.
The 30-Day IRP Reporting Rule for Larger Exporters
If your aggregate turnover is ₹10 crore or more, a stricter rule applies: you must report your invoice to the Invoice Registration Portal (IRP) within 30 days of the invoice date, or the IRP will refuse to generate an Invoice Reference Number (IRN) for it. A missed deadline isn't a minor inconvenience — without a valid IRN, the invoice isn't considered legally valid, which can directly block a GST refund claim on zero-rated exports that depends on that invoice.
What Happens If You Don't Comply
- Non-compliant invoices can attract a penalty of ₹10,000 per invoice
- The buyer cannot claim Input Tax Credit on an invoice without a valid IRN
- For exporters, a missing or rejected IRN can cascade into problems with GSTR-1 reporting and refund claims on zero-rated supplies
- e-Invoices can only be cancelled on the IRP within 24 hours of generation — after that, a credit note is the only way to reverse it
Getting Ready If You've Just Crossed the Threshold
If your business has recently crossed ₹5 crore turnover for the first time, preparation typically takes 2 to 4 weeks: enabling the e-invoice API on the GST portal, configuring your accounting software or a GST Suvidha Provider (GSP) tool, cleaning up HSN codes and customer GSTIN master data, and running test invoices on the sandbox before going live.
The threshold has been lowered progressively since e-invoicing began in 2020 — starting at ₹500 crore and stepping down to today's ₹5 crore — so businesses hovering near the limit should assume further tightening is possible and get their systems export-ready in advance rather than scrambling after crossing it.
Frequently asked questions
Is e-invoicing mandatory for export invoices?
Yes. Once your aggregate turnover has crossed ₹5 crore in any financial year since GST began, e-invoicing covers B2B, export, SEZ and deemed-export supplies.
What do EXPWP and EXPWOP mean?
They are the supply types used for export e-invoices: EXPWP is export with payment of tax and EXPWOP is export without payment of tax. Shipping bill details are captured separately in the invoice data.
What is the 30-day IRP rule?
If your aggregate turnover is ₹10 crore or more, you must report each invoice to the Invoice Registration Portal within 30 days of the invoice date. After that, the IRP will not generate an IRN for it.
What happens if I do not generate an e-invoice?
Non-compliant invoices can attract a penalty of ₹10,000 per invoice, the buyer cannot claim input tax credit, and for exporters a missing IRN can affect GSTR-1 reporting and refund claims.
Can an e-invoice be cancelled?
Only on the IRP within 24 hours of generation. After that, issue a credit note to reverse it.
Need Help Getting This Done?
BuyGenix Solutions helps you check your e-invoicing obligations, set up compliant systems, and keep your export refund claims moving without IRN issues.
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