Singapore’s shift to InvoiceNow — the ubiquitous e-invoicing network built on the international Peppol framework — has moved from optional to essential. Since 1 November 2025, GST-registered businesses onboarding voluntarily to InvoiceNow have benefited from IRAS incentives, and staged mandatory adoption has been progressively rolled out from 2026. If you run a GST-registered Singapore business and are still sending PDF invoices by email, you are not just missing a productivity gain — you are running into a compliance clock.
This 2026 guide explains what InvoiceNow is, who must adopt it, when, and how to migrate. It also covers the practical mistakes small businesses make in the changeover.
What Is InvoiceNow?
InvoiceNow is Singapore’s nationwide e-invoicing network, launched by IMDA in 2019 and now overseen for GST integration by IRAS. It uses the Peppol standard — a global open interoperability network — to enable business-to-business invoices to move directly from one accounting or ERP system to another, without email attachments, PDFs, or manual data entry.
Every business on InvoiceNow has a Peppol ID linked to its UEN. When you send an invoice, your accounting system generates a Peppol-standard structured file that is delivered through an access point to your customer’s inbox and posted straight into their accounts payable system. IRAS receives GST-relevant invoice data in near real time.
Why the Government Is Pushing It
- Reduced GST fraud — structured, machine-readable invoices are harder to falsify than PDFs
- Faster GST refunds — IRAS can validate input tax claims automatically
- SME productivity — no more manual keying of supplier invoices; fewer disputes
- Cross-border interoperability — Peppol is used in 30+ countries, making Singapore invoices easily transmissible to overseas customers on the same network
Who Must Adopt InvoiceNow and When
IRAS has published a staged mandate for GST-registered businesses:
| Group | Effective Date |
|---|---|
| Voluntary GST registrations (new) | 1 November 2025 |
| New incorporations that register for GST | 1 April 2026 |
| All new GST registrants (compulsory and voluntary) | 1 April 2026 onwards |
For existing GST-registered businesses, IRAS has signalled a further phased approach. The current live guidance is on iras.gov.sg — check it against your registration date and business type.
How InvoiceNow Works, End to End
- Register a Peppol ID — via IMDA’s registry through an accredited Access Point provider
- Choose an Access Point provider — many accounting software vendors are already registered (Xero, QuickBooks Online, Jaz, Financio, etc.)
- Enable e-invoicing in your accounting system
- Send test invoices to a friendly customer or the sandbox environment before going live
- Update customer master data so your system knows each customer’s Peppol ID
- Go live and monitor delivery receipts
Because Peppol is a “four-corner” network — sender, sender’s access point, receiver’s access point, receiver — invoices are exchanged automatically once both parties are onboarded. No portal login is required.
Common Migration Mistakes
1. Delaying registration until the last month
Access Point onboarding takes time. Rushing to comply with a hard deadline can lead to failed test cycles and invoice delivery errors during peak billing periods.
2. Not cleaning up customer master data
Customer records with incorrect UENs, duplicated entries, or missing addresses will fail Peppol delivery. Fix master data before going live, not after.
3. Assuming your customer is already on InvoiceNow
Many Singapore SMEs are not yet on the network. Confirm each customer’s Peppol ID during onboarding. Where the customer is not on Peppol, you may still need to issue a parallel PDF invoice until they onboard.
4. Sending duplicate invoices during transition
Sending both a PDF and a Peppol invoice creates reconciliation risk. Once you switch a customer to Peppol, retire the parallel PDF workflow for that customer.
5. Not aligning with GST reporting
InvoiceNow feeds directly into IRAS visibility of your revenue. Ensure your GST-registered turnover reconciles to your Peppol-transmitted invoice volume. Discrepancies invite queries.
What About Non-GST Registered Businesses?
Non-GST-registered businesses are not currently mandated to adopt InvoiceNow but are encouraged to do so — many customers now prefer Peppol delivery, and the productivity benefits are the same. If you plan to register for GST in the near term, adopt InvoiceNow at the same time to avoid a dual migration later.
Foreign Suppliers and Cross-Border Invoices
Where a Singapore business receives invoices from a foreign supplier that is on Peppol in their home jurisdiction (e.g. Australia, Belgium, Malaysia), Peppol enables the invoice to flow into your Singapore accounting system automatically. The Peppol standard is jurisdiction-agnostic — content fields (VAT treatment, GST codes) are jurisdiction-specific but the delivery envelope is common.
For a Singapore business selling to foreign customers, the same applies. Singapore exports through InvoiceNow will land in a Peppol-enabled overseas customer’s inbox seamlessly. Zero-rated exports still require proper documentation for IRAS.
Cost Considerations
InvoiceNow itself is free — the network does not charge users. Costs arise from your Access Point provider and any accounting software subscription. Most cloud accounting platforms bundle Peppol connectivity into standard subscriptions.
IMDA has previously offered grants for SME e-invoicing adoption. Check current schemes via Enterprise Singapore and IMDA. Some grants may be layered with the SFEC (SkillsFuture Enterprise Credit).
Impact on Your Accounting Function
- Fewer manual data entry hours — supplier invoices land pre-populated
- Faster month-end close — no chasing missing invoices in email
- Better cash forecasting — real-time invoice status
- Reduced disputes — no PDF version-control issues
- Tighter GST discipline — every Peppol invoice records the GST treatment explicitly
For businesses running Jaz, Xero, QuickBooks, or other Peppol-ready systems, activation is largely a matter of enabling the module and confirming the Peppol ID.
FAQ
Do I still need to keep paper or PDF copies of invoices?
The Peppol invoice is the source document. IRAS accepts electronic invoices in structured form. You should retain digital records under GST record-keeping rules (currently 5 years).
What if my customer refuses to accept Peppol invoices?
You may issue a parallel PDF for their convenience, but the Peppol invoice remains the authoritative record. Encourage customers to onboard — the network effect only works if everyone is on it.
How do credit notes work?
Credit notes are supported as a Peppol document type. Issue via your accounting system in the same manner as an invoice; the credit note is transmitted through the same channel.
What happens if my Access Point provider fails?
Peppol is a four-corner network — Access Points are commercial providers. Switching providers involves updating your Peppol registration to point to the new Access Point. Downtime should be minimised through provider redundancy.
Is InvoiceNow the same as e-invoicing?
InvoiceNow is Singapore’s implementation of Peppol-based e-invoicing. “E-invoicing” is a broader term that includes PDF emails, EDI, and other machine-to-machine formats. InvoiceNow specifically uses Peppol.
Get Ahead of the Deadline
InvoiceNow is not going away. New GST registrants have been onboarded since April 2026 and further waves will follow. If you are running billing on spreadsheets and PDF templates, plan your migration now — before the peak of your next quarter.
Related reading: GST Registration Singapore 2026, Singapore GST F5 Return guide, Corporate Service Providers Act 2024 compliance.
— The Editorial Team, Raffles Corporate Services