Starting October 1, 2027, importers must provide a mill test certificate (MTC) specifying the melt and pour country and heat number for the imported steel products covered by European Union regulations, as published in the official journal on August 31.

Customs authorities may accept supplementary evidence including invoices, delivery notes, quality certificates and clauses in implemented purchase orders or contracts, long-term declarations from suppliers, cost accounting and production documents, customs documents from the exporting country, commercial correspondence, or production descriptions if mill test certificates lack required details.

During a one-year transition period ending September 30, 2027, documents with standalone evidence containing both the melt and pour country and heat number can serve as valid proof if mill test certificates are unavailable. The competent customs authorities must verify any submitted supplementary or standalone evidence.

Importers must declare the melt and pour country through TARIC commodity codes. Shipments lacking proper and verifiable documentation face rejection by customs.