As of April 30, 2021, approximately 80 million savings bonds, totaling $29 billion, have matured but have not been redeemed.
But beware. If you have matured bonds and haven’t cashed them, you owe taxes
A bond that has reached maturity and stopped earning interest is automatically considered redeemed, and the interest amount is reported to the Internal Revenue Service. The income is interest income and is reported on a 1099-INT, and the owner includes it on the yearly tax return.https://www.investopedia.com/ask/answers/111314/how-are-savings-bonds-taxed.asp#:~:text=Owners%20can%20wait%20to%20pay,until%20they%20redeem%20the%20bond.
Currently I bonds are earning a good interest rate – over 7% – for a limited time. Did you know you can buy them with your tax refund? You can learn more about I bonds here.