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Inflation-protected security (TIPS).
US Treasury inflation-protected securities (TIPS) adjust the principal twice a year to reflect inflation or deflation measured by the Consumer Price Index (CPI).
The interest rate is fixed and is paid twice a year on the adjusted principal. So if your principal is larger because of inflation you earn more interest. If it's lower because of deflation, you earn less.
You can buy TIPS with terms of 5, 10, or 20 years at issue using a Treasury Direct account or in the secondary market. At maturity you receive either the adjusted principal or par value, whichever is greater.
You owe federal income tax on the interest you earn and on inflation adjustments in each year they're added even though you don't receive the increases until the security matures. However, TIPS earnings are exempt from state and local income taxes.
These securities provide a safeguard against deflation as well as against inflation since they guarantee that you'll get back no less than par, or face value, at maturity.