The reported timeline

InvoiceNow is Singapore's e-invoicing network, built on the Peppol standard. Advisory summaries describe a phased mandate: a first phase from November 2025 for new voluntary GST registrants, followed by a requirement for businesses that register for GST on or after 1 April 2026, and then a progressive extension to the wider GST-registered population over roughly 2028 to 2031. Some sources describe an end date of April 2031.

IRAS has reportedly notified businesses registered before 2026 of their individual implementation dates from mid-2026, and clarified scope and timing in late February 2026. Because details differ between summaries, check your own notice and the IRAS pages.

Message formats are changing too. Sources say the current Peppol BIS 3.0 format for Singapore is being replaced by a Singapore PINT version, so make sure vendors and integrations target the right one.

What SMEs should do

Find out your date and who your Peppol access point will be, which is often your accounting software provider. Clean up customer and supplier master data, because e-invoicing exposes inconsistencies such as missing tax identifiers or wrong addresses. Run test invoices and reconcile them against what your accounting system records.

Treat it as a process improvement as well as a compliance task. Structured invoices can reduce manual entry, speed up payment, and cut errors.

Clean your master data

Complete and standardize identifiers, addresses, and tax details before invoices start flowing.

Choose your access point

Confirm how your invoices will connect to the network and test early.

What software vendors should do

If you sell accounting, ERP, or billing software to Singapore businesses, support for the current format, access point connectivity, and clear status and error handling will be differentiators. Build good tooling for invoice validation and failed-delivery handling, since users will blame the software when an invoice is rejected.

There is also an opportunity in bridging legacy systems for SMEs that do not use modern accounting packages.

Need to connect your invoicing to InvoiceNow, or build a product for it? Talk to us.

Key takeaways

  • InvoiceNow mandates are phased: new voluntary GST registrants first, then those registering from 1 April 2026, then a wider rollout reported for roughly 2028 to 2031.
  • IRAS notifies pre-2026 registrants of their implementation dates; check your own notice.
  • SMEs should clean master data, pick an access point, and run test invoices.
  • Vendors should support the current format and invest in validation and error handling.
This is general information, not tax or legal advice. Timelines come from advisory summaries as of October 2026 that differ in places; confirm dates and scope with IRAS.