Yield to Maturity (YTM) - Overview, Formula, and Importance Assume that there is a bond on the market priced at $850 and that the bond comes with a face value of $1,000 (a fairly common face value for bonds). On this bond, yearly coupons are $150. The coupon rate for the bond is 15% and the bond will reach maturity in 7 years. The formula for determining approximate YTM would look like below: