31 CFR 128.5: Recordkeeping requirements.

Banks, other depository institutions, International Banking Facilities, bank holding companies, brokers and dealers, and nonbanking enterprises subject to the jurisdiction of the United States shall maintain all information necessary to make a complete report pursuant to this Part for not less than three years from the date such report is required to be filed or was filed, whichever is later, or for such shorter period as may be specified in the instructions to the applicable report form.