Inflation Risk Premium

The extra yield investors demand to compensate for the risk that inflation will erode the purchasing power of a bond's future cash flows.

The inflation risk premium is the extra yield investors demand to hold nominal, long-term debt securities rather than short-term or inflation-protected assets. Because inflation erodes the purchasing power of fixed future coupon and principal payments, investors require a safety margin to compensate for the uncertainty of future inflation rates over the life of a bond. This premium is not directly observable in the market. Instead, it is estimated by comparing nominal bond yields to inflation-protected bond yields (like TIPS) and subtracting expected inflation derived from surveys or economic models. The remaining yield difference represents the compensation for the risk that inflation might end up higher than expected. For retail investors, changes in this premium directly affect bond prices and stock valuations. When inflation uncertainty rises, the premium increases, causing bond yields to climb and bond prices to fall. A rising inflation risk premium also increases the discount rate used to value future corporate cash flows, which can depress stock prices, particularly for high-growth companies whose valuations rely heavily on long-term earnings.

If a 10-year Treasury bond yields 4.5% while a 10-year inflation-protected bond (TIPS) yields 1.8%, the breakeven inflation rate is 4.5% - 1.8% = 2.7%. If independent economic surveys show that investors expect actual inflation to average 2.2% over the next decade, the remaining 0.5% (2.7% breakeven - 2.2% expected inflation) represents the inflation risk premium that investors demand to cover the risk of unexpected inflation volatility.