Starting in November 2025, the Inland Revenue Authority of Singapore (IRAS) will implement a phased adoption of InvoiceNow, the national e-invoicing framework based on the Peppol network, for GST registered businesses. The mandate is expected to cover both B2G and B2B transactions. GST registered businesses will be required to use InvoiceNow solutions to transmit invoice data to IRAS through Peppol Access Point service providers. The adoption of InvoiceNow extends the traditional four corner e-delivery model to a fifth corner. The implementation will occur in phases, starting with voluntary early adoption by GST-registered businesses from 1 May 2025, followed by newly incorporated companies voluntarily registering for GST from 1 November 2025, and then for all new voluntary GST-registrants from 1 April 2026.
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