- From 15.12.2025, export declarations via B2B must use new URLs and an updated format due to the end of the AES transition period.
- The AES system will no longer be backwards compatible with the old ECS system; message formats and validation rules are updated.
- The system will be unavailable for one hour on 14.12.2025 to avoid timezone issues.
- New URLs for both acceptance and production environments are provided for testing and use.
- Technical documentation for the new XSDs is available on AES Export.
Source: financien.belgium.be
Note that this post was (partially) written with the help of AI. It is always useful to review the original source material, and where needed to obtain (local) advice from a specialist.
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