36 C.F.R. § 1235.12
When must agencies transfer records to the National Archives of the United States?
Permanent records must be transferred to the National Archives of the United States when:
(a) The records are eligible for transfer based on the transfer date specified in a NARA-approved records schedule, or
(b) The records have been in existence for more than 30 years (see also § 1235.14).