Singapore InvoiceNow: Peppol E-Invoicing & the IRAS GST Rollout

Singapore InvoiceNow in one sentence

InvoiceNow is Singapore's nationwide e-invoicing network, built on Peppol and governed by IMDA as the country's Peppol Authority, and it is being extended so that invoice data is also transmitted to IRAS for GST purposes. If you invoice Singapore businesses, connecting to InvoiceNow through a Peppol access point is the compliant path.

If the underlying network is unfamiliar, what a Peppol Access Point is covers the four-corner model that InvoiceNow runs on.

Two questions come up so often that each has a page of its own:

• "Is my accounting system ready?" — what an InvoiceNow-ready ERP is, and the six checks to run against your own installation.
• "How does the tax authority get the data?" — how invoice data reaches IRAS through InvoiceNow, corner by corner.

This page explains the rules. If you are past that and choosing a provider — comparing Peppol e-invoicing solutions for Singapore, or scoping an access point for InvoiceNow — Singapore e-invoicing is the page for that, with what GoRoute connects and how.

When is InvoiceNow mandatory for GST?

It already is, for some businesses. IRAS's GST InvoiceNow Requirement began as a voluntary soft launch on 1 May 2025, became a requirement for newly incorporated companies registering for GST voluntarily on 1 November 2025, and reaches every GST-registered business by April 2031.

The phrase to retire is "voluntary". It described Singapore accurately until 1 November 2025 and has been wrong since. IRAS sets these dates and publishes the cohort detail for the 2028–2031 phases, so confirm your own start date on IRAS's GST InvoiceNow Requirement page rather than on any provider's summary, this one included.

Singapore is a Peppol country

Singapore was an early Asia-Pacific adopter of Peppol. Its national programme, InvoiceNow, is built directly on the framework:

• IMDA — the Infocomm Media Development Authority — is Singapore's Peppol Authority.
• Invoices are exchanged as Peppol documents through access points over the four-corner network.
• IMDA accredits access-point and solution providers and sets the technical bar to connect.

So "InvoiceNow" is essentially how Singapore operates Peppol nationally — a branded, governed network on top of the international standard.

The IRAS GST rollout

The significant recent development is the extension of InvoiceNow to tax reporting. Under the IRAS rollout, GST-registered businesses are being brought onto InvoiceNow in phases, with invoice data transmitted to IRAS in addition to the normal buyer↔supplier exchange:

• 1 May 2025 — voluntary soft launch, open to any GST-registered business that wanted to start early.
• 1 November 2025 — required for newly incorporated companies that register for GST voluntarily.
• 1 April 2026 — required for all new voluntary GST registrants.
• April 2028 to April 2031 — extended progressively until it covers every GST-registered business.

This adds a reporting leg to the tax authority on top of the direct exchange — conceptually a continuous-transaction-control layer, comparable in spirit to models emerging in Oman and elsewhere, though Singapore keeps the Peppol network at its core. Who sends that data, what travels in it, and what happens to sales that never touch the network are covered in how invoice data reaches IRAS through InvoiceNow.

InvoiceNow vs Peppol BIS

Two terms that get conflated:

• InvoiceNow — the Singapore programme and network (including the IRAS GST layer).
• Peppol BIS Billing 3.0 / PINT — the invoice content standard it uses.

You still produce a standards-compliant Peppol invoice; InvoiceNow is the national context — participant registration, accreditation, and the IRAS transmission — that wraps it. Sending a malformed or wrong-profile document fails the same way anywhere; see validation errors you can prevent.

Singapore in the Asia-Pacific picture

Singapore sits alongside a widening group of Peppol jurisdictions in the region — Japan's PINT JP, Australia's rollout, Malaysia's MyInvois and the UAE PINT AE work. Trading across them means several profiles and reporting layers at once — the argument for a single multi-country integration. The full calendar is in the e-invoicing mandates 2026 tracker.

Getting ready

This page stops at the rules; whether the software you already run can meet them is a different question, and it is answered in full by what an InvoiceNow-ready ERP is. That page carries the six checks to run against your own installation, the two meanings the phrase "InvoiceNow-ready" is used in, and which accounting systems connect.

How GoRoute helps

GoRoute (POP000991) is a certified Peppol Access Point and SMP. Because InvoiceNow is Peppol, the same integration that reaches European and other Asia-Pacific participants applies — you map your data once, validate before sending, and exchange over the network through one REST API, with Singapore handled as part of a wider programme rather than a one-off connector. The commercial detail — what connects, what it covers, what to ask a provider — is on Singapore e-invoicing. Book a demo or read the multi-country e-invoicing API.

Sources: IRAS — GST InvoiceNow Requirement, the phase dates above; IMDA — InvoiceNow; IRAS — InvoiceNow; Peppol / OpenPeppol.