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Coupa Success Portal


When setting up your remit-to address, your Goods and Sales Tax ID (GST ID) must be in one of the following formats: 

  • X12345678X
  • 123456789X
  • X123456789
  • 9 characters, for example, 12345678X
  • XY12345678

All tax and total amounts must include the alternateAmount and alternateCurrency attributes. The alternate currency must be set to SGD.

See Providing Amounts in Local Currency for more info.


When adding a tax exempt line or creating a reverse change invoice, add this element to your cXML:

<Description xml:lang="en-US">Line level exemption reason</Description>

Include the <Description> element immediately after <tax-amount>. It's required when the TaxDetails category contains an exemption. For more information, see Add Tax Exemption Details to an Invoice.


The following extrinsics are required to send a compliance-assured Singaporean invoice. You may require additional extrinsics specific to your industry or billing situation:

  • ExchangeRate

Other extrinsics may be required based on your specific invoicing scenario. See Adding Extrinsics to Your Invoice for more info.

Article type: Reference