Not GST e-invoicing (IRN). This tool makes regular GST tax invoices, quotations and receipts. It is not a GST e-invoicing system: it does not register invoices on the Invoice Registration Portal (IRP) and does not generate an IRN or the signed e-invoice QR code. Businesses that must issue e-invoices (aggregate turnover above the notified threshold, currently ₹5 crore) have to report B2B invoices on the IRP. You are responsible for tax rates, HSN/SAC codes and place of supply; check with your tax adviser. This is not legal or tax advice.