# EU AI Act Article 73 Serious Incident Reporting Checklist

> A reporting-readiness checklist for high-risk AI serious incident intake, timing triage, causal-link review, evidence preservation, and escalation.

Published: 2026-04-28  
Last updated: 2026-04-28  
Last reviewed against official source pages: 2026-04-28

## Timing triage
| Situation | Timing signal | Action |
|---|---|---|
| Standard serious incident path | Not later than 15 days after awareness, after causal link or reasonable likelihood is established | Start evidence review immediately |
| Widespread infringement or Article 3(49)(b) serious incident | Immediately and not later than 2 days after awareness | Escalate immediately |
| Death of a person | Immediately after causal relationship is established or suspected, and not later than 10 days after awareness | Activate executive/legal workflow |
| Missing facts | Initial incomplete report may be followed by a complete report | Track missing facts and owner |

## Evidence to capture
- AI system name, version, provider, deployer, owner, and geography.
- High-risk classification assumption.
- Incident timeline and affected persons.
- Harm type and seriousness assessment.
- Known or suspected causal link.
- Model output, input, logs, prompts, audit records, and human review.
- Containment, corrective action, and post-market monitoring updates.

## Escalation checklist
- Notify legal/compliance.
- Notify provider or deployer counterparty.
- Notify security/product owner.
- Preserve evidence before system-altering investigation steps.
- Assign report owner and completion owner.

## Related pages
- [AI Incident Response Plan](../eu-ai-act-incident-response-plan-template.html): Define response workflow.
- [Serious Incident Register Lite](../eu-ai-act-serious-incident-register-template.html): Track records.
- [Post-Market Monitoring Plan](../eu-ai-act-post-market-monitoring-plan-template.html): Update monitoring signals.

## Review note
Educational starter only. Not legal advice, not conformity assessment, and not a guarantee of compliance. Verify against Regulation (EU) 2024/1689, official guidance, national implementation, sector rules, and qualified professional advice.