Supplier Declaration

A supplier declaration is a formal statement from a supplier about their materials, substances, manufacturing processes, or ethical practices. These declarations are the primary mechanism for collecting compliance data from upstream supply chain partners. Common examples include full material disclosures (FMDs) that list every substance in a component, conflict minerals reporting templates (CMRTs) that trace tin, tantalum, tungsten, and gold sources, certificates of conformity confirming regulatory compliance, and sub-supplier disclosures that reveal tier-2 and tier-3 supply chain participants. Supplier declarations form the due diligence backbone of frameworks ranging from REACH to the EU Corporate Sustainability Due Diligence Directive (CS3D).

Regulators and buyers increasingly hold companies responsible for compliance throughout their entire supply chain, not just within their own operations. The EU CS3D, German Supply Chain Act, UK Modern Slavery Act, and UFLPA all require companies to demonstrate due diligence across their supplier base. Supplier declarations are the primary evidence for this — they document what suppliers provide, where materials originate, whether conflict minerals are present, and whether ethical standards are met. Without systematic supplier declarations, companies cannot prove they've conducted the due diligence that modern compliance frameworks demand.

The main categories are material declarations (full material disclosures listing every substance above threshold levels, conflict minerals reporting templates, recycled content statements, and substance declarations for restricted substances like SVHCs), certificates of conformity (supplier-issued CoCs confirming that materials or components meet specific regulatory standards or contractual requirements), sub-supplier disclosure (tier-2 and tier-3 visibility revealing the upstream supply chain beyond direct suppliers), and code of conduct acknowledgements (signed commitments to ethical practices, environmental standards, and compliance obligations that demonstrate due diligence in buyer-mandated programmes).

Suppliers submit declarations through Sustalium's secure supplier portal, which guides them through structured forms for each declaration type. Declarations are stored per supplier and automatically linked to every framework referencing that supplier's materials or components. When a supplier updates their declaration — for example, a new substance disclosure or an updated CMRT — all affected compliance documents update automatically. Sustalium tracks which suppliers have submitted which declarations, flags missing or expired declarations, and provides a consolidated view of supply chain compliance status for due diligence reporting.

Nearly every supply chain compliance framework relies on supplier declarations. Key frameworks include REACH and UK REACH (substance declarations from suppliers), the EU Conflict Minerals Regulation and Dodd-Frank Section 1502 (CMRTs from smelters), the Corporate Sustainability Due Diligence Directive - CS3D (comprehensive supplier due diligence), the UFLPA (forced labour declarations from upstream suppliers), modern slavery legislation (UK, Australia, Canada — supplier ethical declarations), the German Supply Chain Due Diligence Act (systematic supplier risk assessment), and buyer-mandated programmes (EcoVadis, Sedex assessments that cascade compliance requirements through the supply chain).