Home/Learn/GST Glossary/Invoice Reference Number (IRN)Back to glossary A–ZLetter IInvoice Reference Number (IRN)Unique number generated during e-invoice registration.Related Invoism toolsIRN Deadline CheckerE-Invoice Penalty CalculatorRelated termsIGST (Integrated GST)Input Tax Credit (ITC)Input Service Distributor (ISD)Import of GoodsAdditional Place of BusinessAdvance RulingAggregate TurnoverApplication Reference Number (ARN)Full GST glossaryFree GST tools
