Singapore Introduces Phased CTC E-Invoicing Obligation from November 1, 2025

On April 14, 2024, the Inland Revenue Authority of Singapore (IRAS) and the Infocomm Media Development Authority (IMDA) announced the GST InvoiceNow Requirement, marking Singapore’s move toward phased mandatory B2B e-invoicing using the Peppol CTC model. The announcement was made during the InvoiceNow Industry Day event.

What Is the GST InvoiceNow Requirement:

InvoiceNow is Singapore’s nationwide e-invoicing network, introduced by IMDA in 2019 and built on the Peppol framework. It is already the default channel for B2G invoicing.

Under the GST InvoiceNow Requirement, Singapore will extend the existing 4-corner model into a 5-corner Peppol CTC model, enabling invoice data to be transmitted to IRAS through accredited service providers.

When businesses exchange PINT SG–formatted e-invoices with trading partners via InvoiceNow, a copy of the invoice data is automatically delivered to IRAS for GST administration.

IMDA will publish the list of InvoiceNow solutions connected to IRAS by May 2025.

Implementation Timeline:

The mandate will be introduced in phases:

• May 1, 2025: Soft launch. Voluntary adoption for GST-registered businesses
• November 1, 2025: Mandatory for newly incorporated companies that voluntarily register for GST
• April 1, 2026: Mandatory for all new voluntary GST registrants, regardless of incorporation date

Newly incorporated companies are defined as entities incorporated within six months before applying for GST registration.

Scope of Transactions:

GST-registered businesses will be required to transmit invoice data to IRAS for the following transactions:

• Standard-rated supplies, excluding reverse charge supplies
• Zero-rated supplies
• Standard-rated purchases where input tax is claimed or will be claimed, excluding reverse charge purchases
• Point-of-sale transactions, where businesses may submit aggregated data

Exemptions:

The following entities are excluded from the GST InvoiceNow Requirement:

• Overseas entities, including those registered under the Overseas Vendor Registration regime
• Businesses registered under the Reverse Charge Regime

What This Means for Businesses:

Singapore’s GST InvoiceNow Requirement aligns with global trends toward real-time digital tax controls and e-invoicing-based tax administration. Businesses operating in Singapore should begin assessing their Peppol readiness, service provider connectivity, and invoice data flows ahead of the November 2025 milestone.