The CMT yield values are read from the yield curve at fixed maturities, currently 1, 2, 3 and 6 months and 1, 2, 3, 5, 7, 10, 20, and 30 years. This method provides a yield for a 10 year maturity, for example, even if no outstanding security has exactly 10 years remaining to maturity. 10 Year-3 Month Treasury Yield Spread: The 10 Year-3 Month Treasury Yield Spread is the difference between the 10 year treasury rate and the 3 month treasury rate. This spread is widely used as a gauge to study the yield curve. A 10 year-3 month treasury spread that approaches 0 signifies a "flattening" yield curve. Series is calculated as the spread between 10-Year Treasury Constant Maturity (BC_10YEAR) and 3-Month Treasury Constant Maturity (BC_3MONTH). Starting with the update on June 21, 2019, the Treasury bond data used in calculating interest rate spreads is obtained directly from the U.S. Treasury Department.