31 C.F.R. § 380.0
The regulations in this part govern the types of acceptable collateral that you may pledge to secure deposits of public monies and other financial interests of the Federal Government, as well as the valuation of that collateral. Specifically, the regulations in this part apply to the programs governed by the Department of the Treasury's regulations at 31 CFR part 202 (Depositaries and Financial Agents of the Government), 31 CFR part 203 (Payment of Federal Taxes and the Treasury Tax and Loan Program), and 31 CFR part 225 (Acceptance of Bonds Secured by Government Obligations in Lieu of Bonds with Sureties). The regulations in this part apply only to the acceptability and valuation of collateral that may be pledged under these programs. 31 CFR parts 202, 203, and 225 continue to govern the respective programs themselves.
31 C.F.R. § 380.0