This website serves to guide anyone who wants to discover and learn about European e-invoicing guidelines.

It provides detailed information on invoice structure, explanations of individual fields, and shows where each field appears in different invoice syntaxes.

The content covers the European e-invoicing standard EN 16931 and the various country-specific CIUS (Core Invoice Usage Specifications) rules that build on top of EN 16931.

Start exploring the EN 16931 versions in the tree view.