Singapore’s GST InvoiceNow mandate is now firmly part of the regulatory landscape since November 2025. For finance leaders and their teams, the focus today is on reporting and e-invoicing.
Across the market, finance teams have moved beyond high-level awareness and into a phase of deeper operational scrutiny:
- What data points must be included in invoices transmitted through InvoiceNow?
- Who must report invoices to IRAS?
- Where do buyer and supplier responsibilities differ?
- How should exceptions such as cross-border, intercompany, or PDF invoices be treated?
These are the same practical issues being discussed by CFOs, tax leaders, shared services directors, and AP and AR managers across Singapore today.
What the mandate means in practice
At its core, the mandate requires in-scope, GST-registered businesses to transmit invoices through the national InvoiceNow network and to report invoice data to IRAS through that same infrastructure. On paper, the rule is straightforward. In practice, it touches almost every part of the finance organization.
Invoices must follow structured XML standards such as SG Peppol BIS or PINT-SG. Reporting must align with GST return timelines. Buyer and supplier data may differ due to input tax treatment. Even invoices that never travel through InvoiceNow, such as certain PDF and cross-border documents, can still fall under IRAS reporting obligations. This is where many organizations discover that compliance extends well beyond system connectivity.
The shift in finance leadership focus
What finance leadership is now focused on is no longer just technology enablement, but compliance confidence. There is increased emphasis on confirming that all in-scope transactions are being reported correctly, that internal ownership between buyers and suppliers is unambiguous, and that exceptions are handled consistently across teams and entities.
In parallel, there is stronger attention on process and control readiness. AP validation, credit note handling, reconciliation between supplier and buyer submissions, and audit defensibility are all under sharper scrutiny. As invoice data flows directly to the tax authority, the tolerance for inconsistency is significantly reduced.
Why we created the Singapore E-Invoicing Mega FAQ
It is against this backdrop that we created the Singapore E-Invoicing Mega FAQ with 40+ hands-on questions answered. The document was designed as a practical reference built around the real questions finance professionals are raising with their peers.
It brings together mandate scope and timelines, buyer and supplier responsibilities, reporting rules, invoice formats, the treatment of PDFs and cross-border transactions, self-billing considerations, and the technical concepts that underpin InvoiceNow. Rather than replicating regulatory language, the FAQ focuses on how the rules work in real business scenarios, reflecting the same discussions currently taking place across finance organizations.
Moving forward with confidence
Singapore’s e-invoicing regime is intended to increase transparency, automation, and tax control. For finance organizations, success now depends on replacing assumptions with documented understanding, aligning tax, finance operations, and IT teams on one shared interpretation of the rules, and ensuring that everyday invoice processing truly matches what is being reported to IRAS.
Clarity is no longer a nice-to-have. It is a compliance necessity.
Download the full FAQ
If you are responsible for finance operations, tax, compliance, or shared services, we strongly recommend using the full FAQ as a reference point for your internal controls, governance design, and partner discussions. The questions your peers are already working through are likely the same ones covered in the Mega FAQ.
Download the Singapore E-Invoicing Mega FAQ to access the complete, practical guidance.
