What Zegel relies on

Sources

1. GovernmentVIES, VAT Information Exchange System (REST API check-vat-number)Europese Commissie, DG TAXUD · checked on 13 October 2026
2. GovernmentKBO Public Search (ondernemingsnummers)FOD Economie, Kruispuntbank van Ondernemingen · checked on 13 October 2026 · still to be reviewed
3. GovernmentBtw-tarievenFOD Financiën · checked on 13 October 2026 · still to be reviewed
4. GovernmentE-factureringFOD Financiën · checked on 13 October 2026
5. GovernmentGestructureerde elektronische facturen tussen ondernemingen verplicht sinds 2026e-Factuur (FOD Beleid en Ondersteuning, FOD Financiën) · checked on 13 October 2026
6. GovernmentPeppol Directory (public search and REST API)OpenPeppol · checked on 13 October 2026
7. GovernmentRijksregisterFOD Binnenlandse Zaken, Algemene Directie Instellingen en Bevolking · checked on 13 October 2026 · still to be reviewed
8. GovernmentFeestdagenFOD Werkgelegenheid, Arbeid en Sociaal Overleg · checked on 13 October 2026
9. GovernmentPostcodevalidatie-toolbpost · checked on 13 October 2026
10. GovernmentWet van 3 juli 1978 betreffende de arbeidsovereenkomsten, art. 37, 37/1 en 37/2 (Justel, gecoördineerd)FOD Justitie (Belgisch Staatsblad, Justel) · checked on 21 October 2026 · still to be reviewed
11. GovernmentWetsontwerp tot wijziging van artikel 37/2 (opzegging bij niet meer dan zes maanden anciënniteit), DOC 56 1346, wet van 3 juni 2026Kamer van volksvertegenwoordigers · checked on 21 October 2026 · still to be reviewed
12. GovernmentInterestvoet bij betalingsachterstand in handelstransacties (art. 5 wet van 2 augustus 2002), fiche per semesterFOD Financiën, Thesaurie · checked on 21 October 2026 · still to be reviewed
13. GovernmentBetalingsachterstand: wettelijke rentevoeten per lidstaatEuropese Commissie, Your Europe · checked on 21 October 2026 · still to be reviewed
14. StandardIBAN Registry (lengths per country)SWIFT (ISO 13616 registration authority) · checked on 13 October 2026 · still to be reviewed
15. StandardGestructureerde mededeling en betaalstandaardenFebelfin · checked on 13 October 2026 · still to be reviewed
16. StandardEPC069-12 Quick Response Code: guidelines to enable data capture for the initiation of a SEPA credit transferEuropean Payments Council · checked on 13 October 2026 · still to be reviewed
17. StandardPeppol code lists (participant identifier schemes, 0208)OpenPeppol · checked on 13 October 2026 · still to be reviewed
18. StandardPeppol CNAME to NAPTR Migration Process v1.0.0 (SML lookup of participants)OpenPeppol · checked on 21 October 2026 · still to be reviewed
19. DataIdentificatiecodes van de Belgische banken (volledige lijst, versie 01/09/2026)Nationale Bank van België · checked on 13 October 2026
    Licence: NBB - Public
20. DataConversion Postal code – Refnis code (versie 01/01/2025)Statbel (Algemene Directie Statistiek) · checked on 13 October 2026
    Licence: CC BY 4.0 (Statbel open data)

Texts reviewed on 21 October 2026

Zegel checks and calculates, but gives no legal or tax advice. If in doubt, ask your accountant or the relevant authority.