How do Foreign-Trade Zones differ from other programs administered by Customs?

With foreign-trade zones, unlike other similar programs (bonded warehouses and temporary importing under bond) administered by Customs, there is generally no time restraints on merchandise remaining in a zone, whether or not subject to duty. Domestic and foreign goods may be admitted to a zone without being subject to Customs duties or certain excise taxes. Goods may be exported from a zone generally, free of duty and tax.