With most types of bonds the interest payments and the amount you receive at maturity are both fixed over the life of the bond. (learnbonds.com)
Series I savings bond interest payments are free from state and local taxes and are completely tax - free in some cases — such as when you use them to pay for qualified educational expenses. (gobankingrates.com)
For investments in taxable accounts, remember that municipal bond interest payments are exempt from federal income tax, and U.S. Treasury bond interest is exempt from state income tax. (simplethriftyliving.com)