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In Belgium specifically there is no need to send a copy to the tax authority until the e-reporting mandate comes into effect in Jan 2028.
In Belgium, all Peppol participants are already registered with BOSA, the Belgian Peppol Authority. This means that every Belgian company is automatically part of the Peppol network. To onboard these companies in Invopop, we first migrate their registration from BOSA to our system.
Belgium uses two Peppol scheme identifiers:
  • 0208 (KBO/BCE enterprise number) — This is the preferred and default scheme for Belgium. It corresponds to the company’s KBO/BCE number (Kruispuntbank van Ondernemingen / Banque-Carrefour des Entreprises), which is the official Belgian business register. Most Belgian companies are registered in Peppol under this scheme.
  • 9925 (BE VAT number) — This is an older, alternative scheme based on the Belgian VAT number. It is typically used by entities that have a Belgian VAT number but are not registered in the KBO/BCE — for example, foreign companies with a Belgian VAT registration.
When you should use 0208: Always use 0208 as your first choice when sending invoices to Belgian companies. This is the standard identifier and what the vast majority of Belgian businesses are registered under.When 9925 may be needed: If you get a “receiver not found” error when sending to a Belgian company using 0208, and you have confirmed the company exists in the Peppol Directory, check whether they are registered under 9925 instead. This is uncommon but does happen.To specify the scheme when sending, include the customer’s Peppol inbox in your GOBL document:
"customer": {
  "name": "Example Company",
  "tax_id": {
    "country": "BE",
    "code": "0123456789"
  },
  "inboxes": [
    {
      "key": "peppol",
      "scheme": "9925",
      "code": "BE0123456789"
    }
  ]
}
Note that when using 9925, the code must include the BE prefix (e.g. BE0123456789), whereas 0208 uses the raw KBO/BCE number without a prefix.
Use the Lookup Participant ID workflow step to verify a recipient’s Peppol registration before sending. If a lookup with 0208 fails, try again with 9925.

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