From 1 April 2026, every new voluntary GST registrant must transmit invoice data to IRAS via the InvoiceNow network, or risk having their GST application rejected. By 2031, all GST-registered businesses will face the same obligation. If your accounting software only produces PDF invoices, it does not qualify.
| Field | Detail
|
|---|---|
| Standard name | GST InvoiceNow Requirement (Peppol-based e-invoicing) |
| Issuing bodies | IMDA (Peppol Authority); IRAS (GST mandate) |
| Legal basis | Goods and Services Tax Act; IRAS administrative requirement |
| Jurisdiction | Singapore only |
| Mandatory from | Confirm with the relevant authority |
| Phased rollout | Existing registrants: assigned dates Apr 2028 – Apr 2031 |
| Certification type | Ongoing operational requirement; verify compliance status at IRAS |
| Accreditation lists | IMDA-accredited IRSP list and AP list (PDFs, updated regularly) |
| Peppol directory | [www.peppolsmp.sg2, search by UEN (0195:SGUEN format) |
| FOC packages | Available for GST-registered businesses up to 31 March 2031 |
What InvoiceNow-Ready Means
InvoiceNow is Singapore’s nationwide e-invoicing network, built on the international Peppol standard and introduced by IMDA in 2019. For its first six years it operated as a voluntary B2B network. The GST InvoiceNow Requirement/gst-invoicenow-requirement), launched in 2025, layers a mandatory tax-reporting obligation on top of that network, making IRAS the fifth corner in a five-corner model where a copy of every invoice flows automatically to the tax authority.
IMDA is the Peppol Authority in Singapore, responsible for defining Peppol Authority Specific Requirements and accrediting Access Point (AP) and Service Metadata Publisher (SMP) providers. IRAS is the tax regulator requiring compliance. These are distinct roles, a solution must satisfy both bodies to qualify.
This is not the same as Malaysia’s MyInvois system, which requires real-time validation before invoice issuance. Singapore’s requirement allows automatic submission after an invoice is issued. IMDA is also the sole Peppol Authority for Singapore, not part of the European Peppol Authority network.
What InvoiceNow-Ready Solutions Must Do
To qualify, accounting software must connect your business to the InvoiceNow network through an IMDA-accredited provider and transmit structured invoice data to IRAS within prescribed deadlines. Software that only generates PDFs does not meet the requirement. The specific criteria are:
- IMDA accreditation, the solution must be offered by an IMDA-accredited InvoiceNow-Ready Solution Provider (IRSP) or connect via an IMDA-accredited Access Point Provider (AP). Check the current IMDA PDF lists before signing up; the lists are updated regularly.
- PINT-SG format generation, invoices must be transmitted as structured PINT-SG XML, not PDF. Each invoice must include Mandatory Data Elements (MDEs): supplier and buyer UEN and GST registration numbers, invoice number, Document UUID, issue date, invoice type code, GST amounts at the prevailing GST rate/gst-invoicenow-requirement), and GST category codes mapped to IRAS Annex E taxonomy (SR, ZR, SRCA-S, TXCA, TXNA).
- Peppol ID registration, the solution must register your business in the SG Peppol Directory using your UEN (format: 0195:SGUEN). Under IMDA’s service requirements, accredited providers must complete this registration within three working days of a request. Corppass authentication is required for the KYC process.
- Submission timing, invoice data must reach IRAS/gst-invoicenow-requirement) by the earlier of your GST return filing date or its filing due date. InvoiceNow-Ready solutions typically transmit data automatically when invoices are issued, keeping you well within this deadline.
- Validation checks (recommended), accredited solutions can flag wrongful GST charges from non-GST-registered suppliers, per the IRAS Recommended Features guide. This feature is not mandatory for IRSPs to build, but it protects you from input tax claim disallowance.
- Record archiving, your solution must retain PINT-SG XML files and transmission acknowledgments for the statutory record-retention period required by IRAS. Confirm the current retention period directly with IRAS/gst-record-keeping). IRAS may request transmission logs, including Acknowledgment IDs, during audit.
Who This Applies To
From 1 April 2026, all new voluntary GST registrants must submit invoice data to IRAS via InvoiceNow-Ready Solutions, regardless of incorporation date or business structure. InvoiceNow adoption is a condition of voluntary GST registration from that date, and applications may be rejected for non-compliance.
For businesses registered before 2026, IRAS has been notifying them of their mandatory implementation date from mid-2026 onward. These dates are calculated from total annual supplies in calendar year 2025, with the rollout running progressively from April 2028 to April 2031. You can check your specific date using the IRAS GST InvoiceNow Implementation Date Calculator/gst-invoicenow-requirement).
A few boundary points worth noting:
- InvoiceNow does not replace GST return filing, both obligations run in parallel.
- Existing record-keeping obligations remain unchanged; confirm the current retention period directly with IRAS.
- Certain narrow categories (e.g., businesses under reverse-charge rules who do not issue standard tax invoices) may be excluded, check the IRAS e-Tax Guide for your specific circumstances.
- For government procurement, InvoiceNow is already the preferred channel. All government agencies receive invoices through AGD as the central hub, and all are connected to the network.
Early adoption also has practical advantages. See what businesses gain by acting before the mandate for a breakdown of audit and refund benefits.
How to Verify InvoiceNow-Ready Status and Spot Common Failures
Verifying that your software, or a supplier, is genuinely InvoiceNow-compliant takes three checks. Do all three before assuming you are covered.
To verify your own software:
- Confirm your provider appears on the current IMDA-accredited IRSP or AP list (download from IMDA’s site; PDFs are updated regularly).
- Search www.peppolsmp.sg for your UEN in 0195:SGUEN format to confirm your Peppol ID is registered and live.
- Check that your software generates PINT-SG XML, not only a customer-facing PDF, and that transmission acknowledgments from IRAS are recorded.
To verify a supplier’s status:
- Search the SG Peppol Directory by their UEN. If they appear, you can exchange InvoiceNow invoices.
- Note the stale-certificate trap: Peppol IDs do not expire, but GST registration can lapse. IRAS does not publish a real-time GST registration directory. Rely on the GST registration number stated on the invoice and be prepared for IRAS to validate it during audit.
Common failures that trigger IRAS scrutiny:
- Incorrect GST category code mapping (e.g., zero-rated supplies coded as standard-rated)
- Missing or wrong UEN/Peppol ID, causing invoice routing failure
- Late transmission, invoice data not sent by the earlier-of deadline
- Failure to register in the SG Peppol Directory before attempting submission
- Ignoring validation-check alerts on wrongful GST charges from unregistered suppliers
IRAS has stated it will take a calibrated enforcement approach during initial phases for genuine mistakes, but persistent non-compliance risks GST registration denial or revocation for voluntary registrants.
If you are ready to send your first InvoiceNow invoice, the step-by-step process starts with confirming your Peppol ID is live in the directory.
What makes accounting software “InvoiceNow-ready” for GST compliance?
It must be offered by an IMDA-accredited IRSP or connect via an IMDA-accredited AP, generate invoices in PINT-SG XML with all IRAS-required Mandatory Data Elements, and transmit them to IRAS automatically by the prescribed deadline. Software that only produces PDF invoices does not qualify.
Do I need InvoiceNow-ready software if I’m already GST-registered?
Yes, once your mandatory implementation date arrives, and from 1 April 2026 for all new voluntary registrants. IRAS has been notifying existing registrants of their specific dates from mid-2026, based on 2025 annual supply figures.
Can I use my existing accounting software or do I need to switch?
Check whether your current software is on the IMDA-accredited IRSP list, some existing solutions have added InvoiceNow capability. If yours is not accredited, you will need to switch or connect it through an IMDA-accredited Access Point Provider.
How does InvoiceNow affect GST audit timelines and refunds?
Businesses submitting invoice data through InvoiceNow can expect shorter GST audits and faster refunds, because IRAS receives transaction-level data continuously rather than requesting documentation after filing. Non-submitting businesses carry a higher audit risk profile by default.
What happens if my accounting software isn’t InvoiceNow-ready by my implementation date?
Voluntary GST registrants risk having their application rejected or their GST registration revoked for non-compliance. For all GST-registered businesses, late or missing submissions increase audit scrutiny and can slow GST refund processing.