A treasury bond is an intermediate term debt obligation of the US government that has maturities of one to thirty years. They are issued in $1,000 denominations and pay interest semiannually. T-notes are a common abbreviation for U.S. Treasury Bonds. The Social Security Administration manages the SSI program. Even though Social Security manages the SSI program, SSI is not paid for by Social Security taxes. SSI is paid for by U.S. Treasury general funds, not the Social Security trust funds.