I Bonds mature after 20 years, but can earn interest for up to 30 years. The interest continues to accrue over the life of the bond and when you redeem the bond, the interest is paid.
I Bonds cannot be redeemed or cashed-in during the first 12 months after purchase. Bonds redeemed after 12 months but prior to 5 years will incurr a penalty equal to the last three months’ interest. After five years, you can redeem I Bonds with no penalty.
The current I Bond interest rate for bonds purchased after November 1, 2008 is 5.64% until April 30, 2009. After that, the inflation rate component of the I Bond yield will be recaculated and set based on the new rate of inflation.
While the interest rate paid on I Bonds does fluctuate, the principal is safe and money can’t be lost through I Bonds, making them a safe, secure and profitable investment.