The yield to maturity (YTM) of a bond is the total return anticipated on a bond if it is held until it matures. It is expressed as an annual percentage rate (APR). When the market price of a bond is equal to its face value, the yield to maturity is equal to its coupon yield.
The coupon yield is the fixed annual interest payment expressed as a percentage of the bond’s face value. When the market price equals the face value, it means the bond is selling at par, and the coupon yield is the same as the yield to maturity. This is because, at par value, the interest income from the coupon payments, combined with the return of the principal at maturity, provides the total return that is reflected in the yield to maturity.