👋 Hi, I’m Burak, a Senior Consultant in System Integration with hands-on experience in European e-invoicing and B2B/B2G integration projects.

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Purpose of this site

This site exists to help anyone discover and learn about European e-invoicing. It’s a practical reference for implementers, developers, consultants, and companies preparing to adopt e-invoicing.

What you’ll find

• A tree-view navigation of the European e-invoicing standard EN 16931 and its country-specific CIUS (Core Invoice Usage Specifications).
• A field-by-field overview showing where each business term appears in the main syntaxes: UBL, CII, and Credit Note.
• Dedicated pages for each business term and codelist, with cross-links back to the tree view.

The scope will be extended over time as the site grows.

Data sources and licensing

This website is based in part on publicly available resources from the Connecting Europe eInvoicing EN 16931 GitHub repository, which is published under the European Union Public Licence (EUPL v1.2).

The material here has been adapted, rephrased, and extended to make it more accessible and educational. This site is not an official EU website and should not be considered a substitute for the official EN 16931 standard or the original documentation.

Important note

This is not an official EU website. It is an independent resource based on the publicly available European standard EN 16931. For the official specifications and updates, please refer to the European Commission’s eInvoicing page.