• UST is the abbreviation for the United States Department of the Treasury, the department of the federal government that manages the US finances.

  • UST is commonly used to refer to debt issued by the United States.
  • Entities subject to UST include the IRS, the US Mint, the Bureau of Public Debt, the Comptroller’s Office, and the Bureau of Alcohol and Tobacco Taxes.
  • UST securities are assumed to have little or no default risk.