GST InvoiceNow Requirement in Singapore

Singapore’s GST InvoiceNow Requirement requires affected GST-registered businesses to submit invoice data to IRAS through InvoiceNow-ready solutions. InvoiceNow uses the Peppol network and the mandatory requirement is being introduced in phases.

Who Must Comply and When?

• 1 November 2025: companies that register for GST voluntarily within six months of incorporation.
• 1 April 2026: businesses applying for voluntary GST registration on or after that date, regardless of incorporation date or business structure.
• 1 April 2028: new compulsory GST registrants and existing GST-registered businesses with total annual supplies not exceeding S$200,000.
• 1 April 2029: existing GST-registered businesses with total annual supplies not exceeding S$1 million.
• 1 April 2030: existing GST-registered businesses with total annual supplies not exceeding S$4 million.
• 1 April 2031: existing GST-registered businesses with total annual supplies above S$4 million.

IRAS has specified exclusions for certain overseas entities and businesses registered wholly because of the Reverse Charge regime. Businesses should check their implementation date and applicable exclusion directly with IRAS.

What Does the Requirement Involve?

Affected businesses must use an InvoiceNow-ready solution capable of transmitting the prescribed invoice data to IRAS. The requirement covers invoice or equivalent billing data for transactions reported in GST returns, subject to IRAS’s detailed aggregation and submission rules.

InvoiceNow is not merely a requirement to email PDF invoices. It is a structured e-invoicing/data-transmission framework over the Peppol network.

Preparing for Compliance

1. Confirm the business’s mandatory implementation date.
2. Assess whether the current accounting/invoicing solution is InvoiceNow-ready.
3. Onboard through an appropriate Access Point/solution provider and complete required setup.
4. Map invoice data and GST treatment correctly and test transmission.
5. Maintain reconciliations between InvoiceNow data, accounting records and GST returns.

How Apexia Corporate Advisory Can Help

Apexia can help assess the GST and accounting implications, reconcile invoice data to GST returns and coordinate with the client’s chosen InvoiceNow-ready software/provider. Software selection and technical implementation are commercial choices; the obligation to submit accurate GST invoice data remains with the GST-registered business.