A supplier compliance declaration is one of the most relied-upon documents in a manufacturing supply chain, yet it is only a first-party statement. This guide explains how to verify a supplier compliance declaration before it goes into your audit file. It covers the difference between a supplier’s declaration of conformity, a test report and a certificate of conformance, and why each carries different evidentiary weight. It sets out four common reasons a sincere declaration is still wrong: an outdated regulatory basis, incomplete substance data, inaccurate part scope, and missing test evidence. It then walks through a practical five-step verification checklist covering part-level scope, currency against the latest REACH SVHC Candidate List, CAS-level completeness against REACH Article 33 and RoHS thresholds, ISO/IEC 17025 accredited lab evidence, and signatory traceability. It also explains how to keep declarations current as REACH, RoHS and PFAS rules change across thousands
