Negative Yields and Nominal Constant Maturity Treasury Series Rates (CMTs): At times, financial market conditions, in conjunction with extraordinarily low levels of interest rates, may result in negative yields for some Treasury securities trading in the secondary market. See our Treasury Yield Curve Methodology page for details. Treasury reserves the option to make changes to the yield curve as appropriate and in its sole discretion. Inputs to the model are indicative bid-side prices for the most recently auctioned nominal Treasury securities. Treasury Par Yield Curve Methodology: The Treasury par yield curve is estimated daily using a monotone convex spline method. This method provides a par yield for a 10-year maturity, for example, even if no outstanding security has exactly 10 years remaining to maturity. The CMT yield values are read from the par yield curve at fixed maturities, currently 1, 2, 3, 4 and 6 months and 1, 2, 3, 5, 7, 10, 20, and 30 years. These par yields are derived from indicative, bid-side market price quotations (not actual transactions) obtained by the Federal Reserve Bank of New York at or near 3:30 PM each trading day. This curve, which relates the yield on a security to its time to maturity, is based on the closing market bid prices on the most recently auctioned Treasury securities in the over-the-counter market. Yields are interpolated by the Treasury from the daily par yield curve. Treasury Par Yield Curve Rates: These rates are commonly referred to as "Constant Maturity Treasury" rates, or CMTs. As a result, there are no 20-year rates available for the time-period Januthrough September 30, 1993. Treasury discontinued the 20-year constant maturity series at the end of calendar year 1986 and reinstated that series on October 1, 1993. See Long-Term Average Rate for more information. From Februto February 8, 2006, Treasury published alternatives to a 30-year rate. The 2-month constant maturity series began on October 16, 2018, with the first auction of the 8-week Treasury bill.ģ0-year Treasury constant maturity series was discontinued on Februand reintroduced on February 9, 2006. Prior to this date, Treasury had issued Treasury bills with 17-week maturities as cash management bills. ** The 4-month constant maturity series began on October 19, 2022, with the first auction of a 17-week Treasury bill as a benchmark Treasury security. See the Yield Curve Methodology Change Information Sheet for more details. All Treasury yield curve rates derived from yield curves that used the HS methodology - prior to implementation of the MC method - remain official. On, Treasury began using a monotone convex spline (MC) method for deriving its official par yield curves and discontinued the use of the quasi-cubic Hermite spline (HS) methodology. *Series Break - Treasury updated its methodology for deriving yield curves.
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