Nominal Yield Spread The spread, expressed in percent or basis points, that when added to the yield at one point on the Treasury yield curve equals the discount factor that will make a security's cash flows equal to its current market price. Investopedia Says: Nominal yield spreads are a convention frequently used in pricing certain types of mortgage-backed securities (MBS). These MBSs are priced at a spread over the interpolated Treasury curve at the point equal to their weighted average life. Related Terms: Bond Discount Rate Nominal Yield Yield Curve Yield Spread Yield Spread Premium |