# InvoiceNow validator (PINT SG)

Source: https://xmlvalid.com/e-invoicing/singapore

> Check an invoice or credit note for InvoiceNow, Singapore's Peppol network, against the PINT SG rules OpenPeppol publishes: the UBL 2.1 schema, the PINT Billing rules and the Singapore rules, with every finding on its line. Nothing is uploaded.

## The GST InvoiceNow Requirement in short

Under the GST InvoiceNow Requirement, GST-registered businesses send their invoice data to IRAS through the InvoiceNow network. Newly incorporated companies that register for GST voluntarily have had to since 1 November 2025, and all new voluntary registrants since 1 April 2026.

IRAS announced on 26 February 2026 that the requirement reaches every GST-registered business in phases: on 1 April 2028 new compulsory registrants and existing businesses with annual supplies of up to S$200,000, on 1 April 2029 up to S$1 million, on 1 April 2030 up to S$4 million, and on 1 April 2031 the rest.

InvoiceNow invoices follow PINT SG, the Singapore specialization of Peppol International, in UBL.

## How to check a PINT SG invoice

1. Open the [validator with the PINT SG invoice profile](https://xmlvalid.com/validate?schema=pint-sg-invoice), or the credit note one. A UBL file with the PINT SG identifier picks the right one by itself.
2. Paste the UBL or drop the file, then press **Validate**.
3. Click a rule id for what it checks.

## What is checked

The UBL 2.1 schema, then OpenPeppol's PINT SG 1.4.1 artefacts as published: the PINT Billing rules and the Singapore rules, such as the GST categories ([BR-CL-17-GST-SG](https://xmlvalid.com/rules/BR-CL-17-GST-SG)) and the GST totals in SGD for an invoice in another currency ([BR-53-GST-SG](https://xmlvalid.com/rules/BR-53-GST-SG)). We compared our results with Saxon for Java on OpenPeppol's PINT examples and altered copies of them: every rule was the same.

Your Access Point and IRAS may check more, such as the registration of the parties, which is not done here.

## Profiles to check with

- [PINT SG Invoice](https://xmlvalid.com/schemas/pint-sg-invoice): A Peppol PINT SG invoice for Singapore, checked against the UBL 2.1 schema, the PINT Billing rules and the Singapore rules OpenPeppol publishes. [Validate](https://xmlvalid.com/validate?schema=pint-sg-invoice)
- [PINT SG Credit Note](https://xmlvalid.com/schemas/pint-sg-credit-note): A Peppol PINT SG credit note for Singapore, checked against the UBL 2.1 schema, the PINT Billing rules and the Singapore rules OpenPeppol publishes. [Validate](https://xmlvalid.com/validate?schema=pint-sg-credit-note)

## Rules invoices break most

Each one has a page with what it checks, its test and, for many, how to fix it.

- [`BR-CL-17-GST-SG`](https://xmlvalid.com/rules/BR-CL-17-GST-SG): Invoice tax categories MUST be coded using valid Singapore code values
- [`BR-53-GST-SG`](https://xmlvalid.com/rules/BR-53-GST-SG): If the GST accounting currency code (BT-6-GST) is present, then the Invoice total GST amount (BT-111-GST), Invoice total including GST amount and Invoice Total...
- [`BR-110-GST-SG`](https://xmlvalid.com/rules/BR-110-GST-SG): The GST accounting currency code (BT-6-GST) must be present when Invoice total including GST amount or Invoice Total excluding GST amount in accounting currency...
- [`BR-109-GST-SG`](https://xmlvalid.com/rules/BR-109-GST-SG): An Universally unique Invoice Identifier (BT-SG-003) shall be formatted according to the UUID standard
- [`BR-CO-10-SG`](https://xmlvalid.com/rules/BR-CO-10-SG): Sum of Invoice line net amount (BT-106) = Σ Invoice line net amount (BT-131).

## Questions

### Is the invoice uploaded?

No. The schema check and the rules both run in your browser. Only the API and URL monitors validate on our servers.

### Does a valid result mean the invoice will be accepted?

It means it passes the schema and the PINT SG rules OpenPeppol publishes. Your Access Point or InvoiceNow-Ready Solution may run further checks.

### Can I check invoices from code?

Yes: the API and the command-line client with --schema pint-sg-invoice, or --schema auto for a folder of mixed invoices.

### Official sources

- [IRAS: Committee of Supply 2026, extension of the GST InvoiceNow Requirement](https://www.iras.gov.sg/news-events/newsroom/committee-of-supply-2026--extension-of-gst-invoicenow-requirement-to-all-gst-registered-businesses-by-april-2031)
- [OpenPeppol: PINT SG specifications](https://docs.peppol.eu/poac/sg/)

### Other countries

- [French e-invoice validator](https://xmlvalid.com/e-invoicing/france)
- [German e-invoice validator: XRechnung and ZUGFeRD](https://xmlvalid.com/e-invoicing/germany)
- [Belgian e-invoice validator: Peppol BIS](https://xmlvalid.com/e-invoicing/belgium)
- [KSeF invoice validator: FA(3)](https://xmlvalid.com/e-invoicing/poland)
- [Croatian eRačun validator](https://xmlvalid.com/e-invoicing/croatia)
- [RO e-Factura validator](https://xmlvalid.com/e-invoicing/romania)
- [FatturaPA validator](https://xmlvalid.com/e-invoicing/italy)
- [UAE e-invoice validator (PINT AE)](https://xmlvalid.com/e-invoicing/uae)
- [JP PINT validator](https://xmlvalid.com/e-invoicing/japan)
- [Australian e-invoice validator (PINT A-NZ)](https://xmlvalid.com/e-invoicing/australia)
- [Spanish e-invoice validator](https://xmlvalid.com/e-invoicing/spain)