This is a systems project, not a template change. The requirement is to transmit prescribed invoice data to the tax authority through an accredited channel on the Peppol network, in a structured format, with incomplete or invalid submissions rejected. Businesses that treat it as an invoice redesign discover the problem late — and the phased deadlines run through to April 2031.
InvoiceNow Readiness
GST e-invoicing — scope, timeline and preparation
This is a systems project, not a template change. The requirement is to transmit prescribed invoice data to the tax authority through an accredited channel on the Peppol network, in a structured format, with incomplete or invalid submissions rejected. Businesses that treat it as an invoice redesign discover the problem late — and the phased deadlines run through to April 2031.
| Item | Detail |
|---|---|
| Business | [COMPANY NAME], UEN [UEN] |
| GST registration number | [NUMBER] |
| Registration basis | [Compulsory / Voluntary] |
| Date of GST registration | [DATE] |
| Date of incorporation | [DATE] |
| Total annual supplies | S$ [AMOUNT] |
| Mandatory compliance date | [DATE] — confirm using the authority’s checker or the notification received |
| Accounting system | [NAME AND VERSION] |
| InvoiceNow-ready solution or access point | [PROVIDER] |
| Peppol identifier | [ID] |
| Project owner | [NAME], [DESIGNATION] |
| Target go-live | [DATE] |
1. What the Requirement Is
1.1InvoiceNow is the national e-invoicing network, operating on the international Peppol standard, allowing structured invoices to pass between businesses across different accounting systems.
1.2The GST InvoiceNow requirement is a separate obligation layered on top: GST-registered businesses in scope must transmit prescribed invoice data to the Inland Revenue Authority through the network, using an accredited solution or access point.
1.3The format is PINT-SG, the Singapore Peppol specification. Transmission is through the five-corner model, with the authority receiving a copy of the invoice data.
1.4This shifts GST reporting from a periodic summary return towards transaction-level data received close to the time of issue.
2. Timeline
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The requirement is structured data transmission through an accredited channel, not a change to how invoices look. Businesses that scope it as a template exercise find in the final month that customer data is incomplete, tax codes are conflated and the accounting system does not support the format. Start from the readiness assessment, not from the invoice layout.
The obligation is phased. It applied from November 2025 to newly incorporated companies registering voluntarily within six months of incorporation, from April 2026 to all new voluntary registrants, and extends in phases to all GST-registered businesses by April 2031. Existing registrants are being notified individually and can check their date with the authority’s online tool. Do not assume the deadline is distant.
A business considering voluntary GST registration should factor in that it will come within the e-invoicing requirement from the outset. That changes the cost-benefit of registering early, particularly for a small business with a simple accounting setup.
Collecting and validating customer UENs and Peppol identifiers across an existing customer base takes months, because it depends on customers responding. Step 7 is scheduled across three months for that reason. Begin it before the system work, not after.
Incomplete or invalid submissions are rejected by the network. Without a daily monitoring process and a named owner, invoices issued to customers can sit untransmitted indefinitely. Step 12 and Clause 6.1 exist because this is the most likely post-go-live failure.
Many systems use one code for both because the tax charged is nil either way. Structured reporting distinguishes them, and the input tax consequences differ. Remapping historical data is tedious but is far easier before go-live than after.
Where an invoice is issued in a foreign currency, the tax amount must still be expressed in Singapore dollars at an accepted rate. Ensure the system captures the rate and its source, not merely the converted figure.
Businesses issuing invoices from more than one system or entity frequently have overlapping or duplicated series. Structured transmission surfaces this immediately. Establish one sequential series per issuing entity before go-live.
A correction must reference the invoice it corrects. Where the system allows a credit note to be raised without that link, make it mandatory. Corrections without references are a common rejection cause and an audit finding.
Tax invoice particulars, the rate, the simplified invoice threshold and the time of supply rules all continue to apply. E-invoicing changes the transmission, not the substance. A business with existing GST errors will find that structured reporting makes them more visible, not less.
A transition grant has been made available to help smaller businesses with adoption costs, subject to conditions that have included a size threshold, a minimum subscription commitment, and successful transmission of live data before the mandated date. Meeting the conditions requires action well before the deadline, not merely an application.
Only accredited solutions and access points may transmit to the authority. Confirm accreditation directly rather than relying on a vendor’s marketing, and check that the accreditation covers the specific service being purchased.
Transaction-level reporting close to real time is the pattern being adopted across the region. A business investing in clean master data, correct tax coding and reliable transmission is preparing for more than this single requirement.
Clause 6.2 is the control that matters after go-live. The authority now holds transaction-level data; a return that does not reconcile to it is a discrepancy that will be visible without any audit being opened.
Reflects Singapore requirements current as of {{DATE OF USE}}. Implementation dates and phases, exemptions, the PINT-SG specification, accredited provider lists and grant terms all change — confirm your mandatory date and the current specification with the Inland Revenue Authority of Singapore before committing to an implementation plan.
This is a ready-to-use template provided for convenience. Laws and requirements change, and every situation is different — please have it reviewed by a qualified professional (a lawyer, corporate secretary, or accountant as relevant) before you rely on it.