How to update the GST Number of your Customer via InvoiceExpress?

How to update the GST Number of your Customer via InvoiceExpress?


How UEN and GST Number are used (important distinction)

1. UEN (mandatory for InvoiceNow routing)

  • The UEN is the legal business identifier

  • It is used by:

    • InvoiceNow / Peppol network for routing

    • CorpPass authorisation

    • IRAS C5 (Corner 5) submission

  • The UEN field must always contain the customer’s UEN, not the GST number.


2. GST Registration Number (mandatory for GST purposes)

  • The GST registration number is required when GST is charged

  • IRAS requires this to:

    • Validate GST charged

    • Perform wrongful GST checks

    • Support GST InvoiceNow submission

How Link4 helps (practical advantage)

Link4’s InvoiceExpress solution:

  • Separates UEN (business identifier) and GST registration number

  • Automatically maps:

    • UEN → InvoiceNow routing

    • GST number → IRAS tax validation


Info
You can include the GST Number of your customer via the My  Network








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