EU AI Act technical documentation requirements: Complete guide for April 2026

The EU AI Act mandates that technical documentation for high-risk AI systems be completed before market placement, covering nine sections from design to post-market monitoring with a compliance deadline of August 2026, and must be maintained for ten years. This requirement is primarily the responsibility of the provider, who must ensure documentation reflects the current deployed state and is updated with any system changes. The Act sorts AI systems into risk tiers, with high-risk systems subject to the full documentation burden, while SMEs can use a simplified form to meet these requirements. Automation is recommended to keep documentation aligned with the deployed system's state, as manual compliance is impractical due to continuous model changes. The Act provides two conformity assessment pathways: internal control and third-party assessment, both requiring complete documentation. Retention obligations remain active even if the system is discontinued, and documentation must be accessible for audits by national competent authorities.

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