Ques. about Can Savings Bonds and taxes.. ??

I'm sure this is an easy question, but I'm not 100% sure what to do here. Let's say someone has a CSB, and in June they cashed out $200, leaving only $40 in the bond. What would they have to claim on their taxes.. the balance they withdrew as income, or the interest which would be very low since there was only $40 left in the bond?? I know about the T5, but it has been delayed and I only have a statement to work with, and I've never dealt with savings bonds before. So if anyone can help I'd appreciate it. :)