Unique Identifier Number (UIN)

A material UIN will be the product identification number for a specific material. “Unique identifier” means the numbers, letters, or combination of numbers and letters that identify merchandise admitted to a zone with zone status. (19 CFR § 146.1(b)(2)) The UIN will be used in the FTZ accounting system and for inventory purposes. The relief of merchandise from a UIN layer in the FTZ accounting system is what triggers duty payment for companies operating in an FTZ.