Singapore is moving its GST system onto a digital, real-time footing. Under the GST InvoiceNow requirement, GST-registered businesses will send invoice data to IRAS automatically through the nationwide InvoiceNow network, which is built on the international Peppol standard. The rollout has already begun for newly registered businesses and will progressively extend to all GST-registered businesses by April 2031.
If you run a GST-registered company, or you are about to register, this is a change worth understanding early. This guide explains what GST InvoiceNow is, who is affected and by when, and the practical steps to get ready.
What is InvoiceNow?
InvoiceNow is Singapore’s nationwide e-invoicing network, based on the Peppol framework used in many countries. Instead of emailing a PDF invoice, your accounting or invoicing software transmits a structured e-invoice directly to your customer’s system through the network. For GST purposes, the GST InvoiceNow requirement layers on top of this: relevant invoice data is also transmitted to IRAS using an InvoiceNow-enabled solution. The goal is fewer errors, faster processing and a more transparent GST system.
Who must adopt it, and when
The requirement is being phased in.
| Group | From |
|---|---|
| Newly incorporated companies that voluntarily register for GST | 1 November 2025 |
| All new voluntary GST registrants (any structure or incorporation date) | 1 April 2026 |
| Existing GST-registered businesses (phased by supply thresholds, smaller first) | 1 April 2028 to 1 April 2031 |
IRAS has indicated it will inform GST-registered businesses that were registered before 2026 of their respective mandatory implementation dates by the middle of 2026. Importantly, for newly incorporated companies applying for voluntary GST registration in this window, obtaining a Peppol ID is a precondition before applying to IRAS.
Why it matters for your business
GST InvoiceNow is not just a compliance box to tick. Because invoice data flows straight into IRAS, accuracy and timing matter more than before. It rewards businesses that already keep clean books and reconcile promptly, and it exposes those that do not. If you are still on manual or spreadsheet-based invoicing, this is a natural prompt to move to cloud accounting, an upgrade that may qualify for support under a grant such as the SMEs Go Digital pre-approved solutions, and which pairs well with disciplined record-keeping.
How to prepare
There are four practical steps. First, choose an InvoiceNow-ready (Peppol-enabled) accounting or invoicing solution, or check that your current software supports it. Second, register for a Peppol ID and connect to the network through an approved access point provider. Third, make sure your customer and supplier master data is clean, because e-invoices depend on accurate identifiers. Fourth, test your outgoing invoices before your mandatory date so there are no surprises. New companies weighing up voluntary GST registration should factor the InvoiceNow precondition into their timeline. The scheme details are maintained by IRAS.
Frequently asked questions
Do I need to adopt InvoiceNow if I am not GST-registered?
The GST InvoiceNow requirement applies to GST-registered businesses. Non-registered businesses can still use InvoiceNow voluntarily for its efficiency benefits, but are not mandated to transmit GST data.
Is a PDF invoice still acceptable?
Once you are within scope, invoice data must be transmitted through the InvoiceNow network in the structured format, not merely as a PDF. You can still provide a human-readable copy to customers.
What is a Peppol ID?
A Peppol ID is your business’s unique address on the e-invoicing network, used to route invoices to and from you. You obtain it through an approved access point provider.
– The Editorial Team, Raffles Corporate Services