did you get any reporting forms such as a 1099-INT or 1099-B
if not then use 1099-INT for payee use the name of finnacial institution where you cashed it, or US Treasury and enter the interest only in Box 3 - US interest
if you got a1099-INT use the name on it. The interest is entered the same as above
if you got a 1099-B, unlikely, US a US Savings Biond, you'll need to report it on form 8949/ capital asset sale Proceeds and cost per the form
