In its role as the central bank of the United States, the Fed serves as a banker's bank and as the government's bank. As the banker's bank, it helps to assure the safety and efficiency of the payments system. As the government's bank or fiscal agent, the Fed processes a variety of financial transactions involving trillions of dollars. Just as an individual might keep an account at a bank, the U.S. Treasury keeps a checking account with the Federal Reserve, through which incoming federal tax deposits and outgoing government payments are handled. As part of this service relationship, the Fed sells and redeems U.S. government securities such as savings bonds and Treasury bills, notes and bonds. It also issues the nation's coin and paper currency. The U.S. Treasury, through its Bureau of the Mint and Bureau of Engraving and Printing, actually produces the nation's cash supply and, in effect, sells the paper currency to the Federal Reserve Banks at manufacturing cost, and the coins at face value. The Federal Reserve Banks then distribute it to other financial institutions in various ways. During the Fiscal Year 2013, the Bureau of Engraving and Printing delivered 6.6 billion notes at an average cost of 5.0 cents per note.