InvoiceNow is the biggest infrastructural change to Singapore SME accounting since GST went to 9% in January 2024. The rollout has been signposted for several years; the first compulsory trigger lands on 1 April 2026 for voluntary GST registrants; the phased extension to all GST-registered businesses runs through 2031.
We've written a shorter operator note on the immediate-action implications at what 1 April 2026 actually means for your accounting stack. This piece is the deeper pillar version — what InvoiceNow is, how the Peppol framework works under it, the full IRAS rollout schedule, the systems implications, and how a Singapore business prepares.
What InvoiceNow is
InvoiceNow is Singapore's nationwide e-invoicing network. It is run by IMDA (the Infocomm Media Development Authority) and built on the international Peppol framework — the same standard the EU, Australia, New Zealand, and a growing list of countries have adopted for structured e-invoicing.
Practically: instead of a PDF invoice sent via email, an InvoiceNow-enabled accounting system sends a structured invoice document directly to the recipient's system through the Peppol network. The recipient's system receives it as data, not as a document that needs to be re-keyed.
For GST purposes, IRAS will receive relevant invoice data through the same network. The same invoice that flows between buyer and seller also informs IRAS.
The Peppol framework
Peppol (Pan-European Public Procurement OnLine, despite the name now extending well beyond Europe) is an open standard for structured business documents. Three layers:
- The network— a federation of certified Access Points that connect to each other. Singapore's IMDA-accredited Access Points connect to international Peppol Access Points.
- The document format — structured XML following the Peppol BIS Billing specification. Captures all the data a paper invoice would, in a machine-readable form.
- The identifiers — each participant has a Peppol ID (e.g. a UEN-based identifier in Singapore), used for addressing.
The benefit of being on the Peppol framework rather than a Singapore-only standard: invoices to and from international counterparts flow through the same network with no special handling. A Singapore business invoicing an Australian customer can send via Peppol; the Australian customer's system receives it natively.
The IRAS rollout schedule
IRAS has announced the InvoiceNow mandate in phases. Verify the latest schedule against IRAS's official guidance for current dates; the published schedule may shift.
As currently set out:
- 1 November 2025: voluntary GST registrants incorporated 1 November 2025 onwards must submit invoice data via InvoiceNow at the point of GST registration
- 1 April 2026: all existing voluntary GST registrants must transmit invoice data via InvoiceNow
- 2027-2031: phased rollout to all other GST-registered businesses, with the exact timing per tranche set by IRAS
- 1 April 2031: target for full coverage of all GST-registered Singapore businesses
The InvoiceNow mandate focuses initially on sent invoices (outbound to customers). The implication for GST F5 reporting will evolve as IRAS builds out the data flow.
What this means for your accounting system
To send via InvoiceNow, you need:
- A Peppol-ready accounting system. Xero is. QuickBooks Online (current cloud version) is. MYOB's newer products are. QuickBooks Desktop is not. Spreadsheets are not. Local niche systems vary; check before relying on them.
- Connection to an IMDA-accredited Access Point. Usually handled by your accounting software vendor; you may need to enable a setting.
- Peppol ID for the business — typically registered automatically via your accounting software when InvoiceNow is enabled.
- Counterparty Peppol IDs for customers you transact with — collect these as part of customer master data setup.
For most Singapore SMEs on Xero, the technical setup to be InvoiceNow-ready is a few hours of configuration, not a system replacement. For SMEs still on non-Peppol-ready systems, the work is more substantial — a system migration.
How it changes business workflows
Once active:
- Outbound invoices are sent via InvoiceNow to customers whose systems are Peppol-ready, and via the network to IRAS for GST purposes
- Inbound invoices from Peppol-enabled suppliers arrive as structured data, ready for booking with much less manual handling
- GST F5 mechanics may eventually simplify as IRAS pre-populates from the InvoiceNow data stream; for now, F5 filing continues as standard
The longer-term outcome is reduced re-keying and fewer reconciliation gaps, since the same data flows between systems automatically. The short-term cost is the setup work and the discipline of clean master data.
What to do now — by mandate date
If voluntarily GST-registered (or about to be)
Mandate hits 1 April 2026. Confirm your accounting system is Peppol-ready. Enable the InvoiceNow setting. Clean customer master data. Aim to have InvoiceNow live at least 60 days before the mandate so the first compliant GST cycle runs without surprises.
If compulsorily GST-registered
Your tranche date is set by IRAS based on business profile. Plan for InvoiceNow readiness within 12 months. The same technical setup applies.
If not GST-registered
No InvoiceNow obligation from IRAS — yet. But consider: if you might cross the S$1M threshold in the next 12-24 months, build InvoiceNow into your system planning so you're not migrating systems and registering for GST in the same quarter.
If on a non-Peppol-ready system
Plan the migration. Six months is comfortable for most SMEs; less is rushed. Use the deadline pressure to redesign the chart of accounts and workflows properly rather than just “migrating to Xero”.
What InvoiceNow doesn't change
- GST rate (currently 9%) — unchanged
- GST F5 quarterly filing cycle — unchanged for now
- Record-keeping requirements (5-year minimum) — unchanged
- Tax invoice content requirements — unchanged
- Voluntary vs compulsory registration thresholds — unchanged
Common questions about InvoiceNow
Do I need to issue paper invoices too once on InvoiceNow?
For customers not on Peppol, you'll still send PDF/email invoices alongside InvoiceNow submission. Over time, more customers will be on Peppol and the parallel becomes unnecessary. For now, both flows coexist.
Does this cost extra in software fees?
Xero includes InvoiceNow at the Standard tier and above. Other Peppol-ready providers vary; check with yours. The Access Point fee (paid to IMDA via your software) is typically included.
What if my customers aren't on InvoiceNow?
You can still send to them via PDF/email as before. The InvoiceNow obligation is on the sender; the recipient doesn't need to be on the network for you to comply. The benefits compound as more counterparts adopt, but the obligation stands regardless.
Can I delay setting up InvoiceNow past the mandate date?
Non-compliance with the mandate carries penalty under the GST Act. The cost-benefit clearly favours being ready by the deadline. Defer at your peril.
What about my historical invoices — do they need to go through InvoiceNow?
No. The mandate is forward-looking from the applicable date. Historical invoices are unaffected; only new invoices issued from the mandate date need to flow via the network.
InvoiceNow is the kind of regulatory infrastructure change that's mostly invisible once it's working. Get the system set up before the mandate lands; the operational benefit follows.
— The Acuitas team