(a) This part applies to depository institutions that hold government securities as fiduciary, custodian, or otherwise for the account of a customer, and that are not government securities brokers or dealers, as defined in sections 3(a)(43) and 3(a)(44) of the Securities Exchange Act of 1934 (15 U.S.C. 78c(a)(43)-(44)). Depository institutions exempt under part 401 of this chapter from the requirements of Subchapter A of this chapter must comply with this part. Certain depository institutions that are government securities brokers or dealers must also comply with this part, as well as with additional requirements set forth in § 403.5.

(b) The regulations in this subchapter are promulgated by the Assistant Secretary (Domestic Finance) pursuant to a delegation of authority from the Secretary of the Treasury. The office responsible for the regulations is the Office of the Commissioner, Bureau of the Fiscal Service. Procedures for obtaining interpretations of the regulations are set forth at § 400.2.