Digital Lexicon Hub

A European standard developed at the Commission's request; once its reference is published in the Official Journal, following it gives a presumption of conformity with the legal requirements it covers.

Harmonized standards give companies a predictable route to show they meet EU product law, including the AI Act, which reduces legal uncertainty and assessment effort, and they explain why an international standard such as ISO/IEC 42001 does not by itself prove legal conformity.

A provider of a high-risk AI system checks the Official Journal list for the AI Act, applies EN 18286:2026 to its quality management system, and records in its technical documentation which requirements it meets through the standard and which through other means.

Using a harmonized standard is voluntary, and the presumption covers only the requirements its Annex ZA lists. A European standard that has been published but not cited in the Official Journal gives no presumption, and any gaps must be covered in other ways.

Under Regulation (EU) No 1025/2012, the Commission asks the European standardization organizations (CEN, CENELEC and ETSI) to draft standards that support specific legislation. After assessing a finished standard, the Commission publishes its reference in the Official Journal of the European Union, and the presumption of conformity applies from that date. Article 40 of the EU AI Act gives this presumption to high-risk AI systems and general-purpose AI models that follow cited standards; the first cited AI Act standard is EN 18286:2026 on quality management. Where harmonized standards are missing or insufficient, the Commission can adopt common specifications under Article 41, and a provider's technical documentation lists the standards applied or describes the other solutions used, which matters in a Conformity Assessment.