IRAS has revised its GST InvoiceNow guidance, clarifying implementation requirements for GST-registered businesses and introducing additional grant support as Singapore expands mandatory e-invoicing through 2031.

RF Report

Singapore’s Inland Revenue Authority (IRAS) has updated its guidance on the GST InvoiceNow Requirement, providing clearer implementation details and expanded support measures as the country moves towards mandatory e-invoicing for all GST-registered businesses by 1 April 2031.

InvoiceNow is Singapore’s nationwide e-invoicing network based on the Peppol framework, enabling businesses to transmit invoice data electronically to IRAS through InvoiceNow-Ready Solutions. Under the GST InvoiceNow Requirement, GST-registered businesses will be required to send invoice data directly to the tax authority in phases based on their GST registration status and annual supplies.

The updated guidance includes revised explanations for businesses entering the regime under the 1 April 2026 and 1 April 2028 implementation phases. Businesses applying for voluntary GST registration on or after 1 April 2026 will be required to comply with the requirement regardless of their incorporation date or business structure. From 1 April 2028, the requirement will also apply to businesses seeking compulsory GST registration and existing GST-registered businesses with total annual supplies of no more than SGD 200,000.

GST InvoiceNow implementation schedule

Effective date Businesses covered
1 Nov 2025 Companies registering for GST voluntarily within six months of incorporation
1 Apr 2026 Businesses applying for voluntary GST registration on or after this date
1 Apr 2028 Businesses applying for compulsory GST registration on or after this date, and existing GST-registered businesses with annual supplies of up to SGD 200,000
1 Apr 2029 Existing GST-registered businesses with annual supplies of up to SGD 1 million
1 Apr 2030 Existing GST-registered businesses with annual supplies of up to SGD 4 million
1 Apr 2031 Existing GST-registered businesses with annual supplies exceeding SGD 4 million

IRAS has also expanded information on financial assistance available to support businesses transitioning to the system. Small and medium-sized enterprises can receive a GST InvoiceNow Transition Grant of SGD 1,000, while larger businesses may qualify for a SGD 5,000 grant. In addition, the InvoiceNow Queen Bee Grant offers up to SGD 25,000 to support wider adoption initiatives.

Under the framework, businesses must transmit data relating to standard-rated, zero-rated and exempt supplies, as well as standard-rated and zero-rated purchases. Certain transactions, including reverse charge transactions, import permits and some exempt financial services transactions, remain outside the scope of mandatory transmission.

The guidance states that invoice data must be submitted to IRAS by the earlier of the actual GST return filing date or the statutory filing deadline for the relevant accounting period. Businesses will continue to be subject to existing record-keeping obligations, while overseas entities, including OVR registrants, and businesses registered solely because of the Reverse Charge regime are currently excluded from the requirement.