SBW is a file extension that is associated with a software bond savings management tool. It is a tool of the US Treasury Department that is responsible for the management of US finances.

The SBW file stores data used by the Savings Bond Wizard. It is a type of database that contains information about purchased securities (purchase date and price, face value, expected profits, etc.). The Savings Bond Calculator web application, available at www.treasurydirect.gov, plays the same role as the Savings Bond Wizard.