Since 2020 Singapore utilizes the InvoiceNow network, which is operated on the Peppol framework. Businesses can either use standalone “off the shelf” InvoiceNow solutions or adapt their ERP systems to transmit their structured invoices. The invoice data is simultaneously transmitted to the Inland Revenue Authority of Singapore (IRAS).
Although commonly referred to as a five-corner model, IRAS operates as a proprietary fifth entity outside the standard Peppol framework. This model is designed to simplify compliance, reduce administrative burdens, boost efficiency, enhance security, improve tax data accuracy, and shorten the GST audit process.
Voluntary e-reporting starts in May
As of May 1, 2025, GST-registered businesses can voluntarily begin e-reporting through InvoiceNow. This soft launch marks the first phase of a broader rollout for domestic companies:
- November 1, 2025: Mandatory for newly incorporated companies from May 1, 2025, that apply for voluntary GST registration
- April 1, 2026: Extension to all new voluntary GST registrants
To support adoption, IRAS provides detailed guidance.
Nonetheless, there is no official e-invoicing mandate in Singapore. Companies are free to opt for any invoicing solution and delivery method of their choice, as long as there is a mutual agreement between the sender and the receiver.
Peppol BIS 3.0 remains the official standard
Singapore initially planned to phase out the SG Peppol BIS 3.0 format in favor of the PINT-SG (Peppol International) standard, aiming to improve international interoperability.
The timeline for this transition has however been postponed and no new dates have been announced. For now, Peppol BIS 3.0 remains the official default standard, while PINT-SG is supported but not mandatory. All companies connected to InvoiceNow must be able to receive invoices in the PINT-SG format as of April 1, 2025.
Head onto our Singapore country profile to learn more about InvoiceNow and gain a comprehensive understanding of the e-invoicing ecosystem in Singapore.
