What are breakeven inflation rates?

Breakeven inflation rates measure the market's expectation for average annual inflation over a specific time horizon. They are calculated as the difference between the yield on a nominal Treasury bond and the yield on a TIPS (Treasury Inflation-Protected Security) of the same maturity. For example, if the 10-year nominal Treasury yields 4.5% and the 10-year TIPS yields 2.0%, the 10-year breakeven inflation rate is 2.5%.

The name "breakeven" comes from the fact that this is the inflation rate at which an investor would earn the same total return from holding either the nominal bond or the TIPS. If actual inflation turns out higher than the breakeven rate, the TIPS holder comes out ahead. If inflation is lower, the nominal bondholder wins.

The most commonly tracked breakevens are the 5-year (T5YIE) and 10-year (T10YIE) measures. The 5-year, 5-year forward rate (T5YIFR) is another important derivative measure that extracts the market's expected inflation rate for the five-year period starting five years from now. The Fed watches this forward measure closely because it captures longer-term inflation anchoring, filtering out near-term inflation noise.

Breakeven inflation rates are a real-time market indicator, unlike survey-based inflation expectations which update monthly or quarterly. This makes them a valuable tool for monitoring how inflation expectations respond to economic data releases, Fed communications, and geopolitical events. A sudden rise in breakevens after a hot CPI print, for example, may signal that markets fear inflation is becoming unanchored.

It is worth noting that breakevens are not a pure measure of inflation expectations. They also embed an inflation risk premium (the extra compensation investors demand for inflation uncertainty) and can be distorted by TIPS liquidity conditions. During periods of market stress, TIPS can become less liquid, causing breakevens to move for reasons unrelated to actual inflation expectations. Analysts often adjust for these distortions using models to extract a cleaner inflation expectations signal.