The bank should have sent you a Form 1099-INT. You enter it like any other 1099-INT for interest income. Interest on U.S. Savings Bonds would be in box 3 of the 1099-INT. In the Search box type 1099-int, then click the link that says "Jump to 1099-int." On the screen where you enter the 1099-INT check the box that says "My form has info in more than just box 1" so you can enter the amount in box 3.