Treasury securities are government debt instruments issued by the U.S. Department of the Treasury to finance the national debt. At the time of this writing, the one-month Treasury bill and the Meanwhile, the yield on the 10-year Treasury note fell 20.7 basis points to 0.499%. Mar. 9, 2020 at 4:14 p.m. ET by Tomi Kilgore Treasury yield curve sinks below 1% after oil and coronavirus A Treasury bill, or T-bill, is a short-term government debt security with a maturity of less than one year. Unlike many other debt securities that make regular interest payments to investors, Treasury bills yield no interest. Rather, the bills are sold at a discount to their redemption price.