19 CFR § 10.1007 - Maintenance of records.

(a) General. An importer claiming preferential tariff treatment for a good (based on either the importer's certification or its knowledge, or on the certification issued by the exporter or producer) imported into the United States under § 10.1003(b) of this subpart must maintain for a minimum of five years from the date of importation of the good, all records and documents that the importer has demonstrating that the good qualifies for preferential tariff treatment under the UKFTA. These records are in addition to any other records that the importer is required to prepare, maintain, or make available to CBP under part 163 of this chapter.

(b) Method of maintenance. The records and documents referred to in paragraph (a) of this section must be maintained by importers as provided in § 163.5 of this chapter.