Answer:
at maturity date
Step-by-step explanation:
Capital Appreciation Bonds are a type of municipal securities since they are backed by local governments. They work in a similarly to zero coupon bonds that accumulate compound interests until maturity date. The difference is that CAB are generally issued at face value, e.g. $1,000, and start accumulating interests. This $1,000 bond that yields 6% and has a maturity date of 10 years, will pay you $1,791 in 10 years.