GST E-Invoicing in India 2026: Everything Distributors Need To Know

The GST Council's phased rollout means almost every distributor with a turnover above ₹5 crore is now mandated to generate e-invoices through the Invoice Registration Portal (IRP). Get it wrong and your retailer can't claim input tax credit — and you face a ₹10,000-per-invoice penalty.

What is an e-invoice?

An e-invoice is not a PDF you email. It's a JSON document you submit to the government's IRP, which returns a unique Invoice Reference Number (IRN) and a QR code. You then print the IRN + QR on the physical invoice you give the retailer.

The 7-point checklist

• Register on the IRP using your GSTIN and a digital signature certificate (DSC).
• Ensure every product has a 4-digit or 6-digit HSN code — generic descriptions are rejected.
• Compute IGST vs CGST+SGST correctly based on supplier and buyer state.
• Generate the IRN within 24 hours of invoice creation (was earlier 7 days).
• Print the QR code on the physical invoice in a minimum size of 2cm × 2cm.
• Reconcile e-invoices with GSTR-1 every month — mismatches block the buyer's ITC.
• Keep IRN + signed JSON for 8 years (the audit retention period).

Common failure modes

The two errors we see most often: (a) the seller forgets to add the HSN code for batch-tracked pharmaceutical products, and (b) the seller computes inter-state vs intra-state GST manually and rounds wrong. Both are eliminated by software that derives values from a single saved order document.

Software that handles this for you

BizShakti speaks directly to the NIC e-invoicing API. The moment a Tax Invoice is generated, we hit the IRP, fetch the IRN + QR, and stamp them onto the printable PDF — zero manual data re-entry. If the IRP is down, the invoice is queued and replayed automatically when it returns.