How many types of government savings bonds are there, and what's the difference between them?
While the U.S. government has issued 13 types of savings bonds, there are currently only two series available for purchase through the U.S. Treasury Department: Series EE bonds and Series I bonds. U.S. savings bonds are nonmarketable securities, which means you can't resell them unless you're authorized as an issuing or redeeming agent by the U.S. Treasury Department. Savings bonds are guaranteed by the federal government as to the timely payment of principal and interest.
You can buy Series EE bonds and I bonds in any amount from $25 up to $10,000, which is the maximum amount you can purchase for each bond type per calendar year. In other words, you may buy a total of $10,000 annually in both EE and I bonds, for an annual total of $20,000 for the two types combined.