E-invoicing in Asia

Executive summary

Asia’s e-invoicing landscape is built around the Peppol network, the same international standard used across Europe and Oceania. Singapore led the way by becoming the first Peppol Authority outside Europe in 2018, and Malaysia is following the same path. This gives businesses in the region built-in cross-border interoperability with all other Peppol-connected jurisdictions worldwide. The region’s approach differs from the Americas’ clearance model. Rather than requiring government pre-approval for every invoice, Asian countries are adopting reporting models where structured invoice data flows to the tax authority in near real time alongside the buyer. Singapore’s five-corner model is the defining architecture: the supplier and buyer exchange invoices through their respective Peppol Access Points, while the tax authority (IRAS) receives a copy of every transaction as the “fifth corner.” Mandates are rolling out in phases through 2025 and 2026, starting with voluntary GST registrants and progressively extending to all registered businesses.

Common standards and formats

Peppol is the shared standard across Asia, providing a unified network for invoice exchange and cross-border interoperability.

Country	Format	Network	Tax authority
Malaysia	Peppol (details TBD)	Peppol	TBD
Singapore	PINT-SG / BIS Billing 3.0 (UBL 2.1 XML)	Peppol	IRAS / IMDA

Singapore uses the PINT-SG format, a Singapore-specific adaptation of OASIS UBL 2.1 XML that includes local requirements such as GST registration numbers, PayNow/GIRO payment methods, and IRAS validation rules. This format is progressively replacing the earlier Singapore BIS Billing 3.0 specification.

Compliance model

The region uses a five-corner Peppol model for e-invoicing and e-reporting. In this model:

The supplier sends an invoice through their Peppol Access Point.
The Access Point routes the invoice to the buyer’s Access Point using the Peppol network.
The tax authority (such as IRAS in Singapore) receives a copy of the transaction as the fifth corner.

This approach combines e-invoicing and e-reporting into a single flow. However, unlike the Americas’ clearance model, invoices do not require government pre-approval to be legally valid. The tax authority receives data for monitoring and compliance purposes without acting as a gatekeeper. Singapore also maintains a separate GST F5 quarterly return requirement. Both the real-time Peppol reporting and the periodic aggregate return coexist — filing GST F5 remains mandatory even for businesses transmitting invoices via InvoiceNow.