Structure
Inflation-indexed bonds pay a periodic coupon that is equal to the product of the inflation index and the nominal coupon rate. The relationship between coupon payments, breakeven inflation and real interest rates is given by the Fisher equation. A rise in coupon payments is a result of an increase in inflation expectations, real rates, or both.
For some bonds, such as the Series I Savings Bonds (U.S.), the interest rate is adjusted according to inflation.
For other bonds, such as in the case of TIPS, the underlying principal of the bond changes, which results in a higher interest payment when multiplied by the same rate. For example, if the annual coupon of the bond were 5% and the underlying principal of the bond were 100 units, the annual payment would be 5 units. If the inflation index increased by 10%, the principal of the bond would increase to 110 units. The coupon rate would remain at 5%, resulting in an interest payment of 110 x 5% = 5.5 units.
Read more about this topic: Inflation-indexed Bond
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