Inflation expectations are the market's forecast of future inflation rates. They are a critical component of nominal bond yields and a key input to monetary policy decisions.
Nominal yields decompose as:
Nominal yield = Real yield + Expected inflation + Inflation risk premium
This Fisher decomposition is not merely theoretical. When the Fed targets 2% inflation and markets believe it, the inflation component of a 10Y nominal yield stays anchored near 2%, and variation in the nominal yield mostly reflects changes in the real rate. When credibility slips, the inflation component takes over, and the curve becomes harder to read.
Two methods dominate fixed-income practice.
TIPS breakeven inflation. The 10-year breakeven equals the 10Y nominal Treasury yield minus the 10Y TIPS yield. As of mid-2025, the 10Y breakeven has traded in the 2.1% to 2.5% range. This spread is not a clean read on expected inflation. It embeds two offsetting distortions: an inflation risk premium (investors require extra compensation for bearing CPI uncertainty, typically +10 to +30 bps) and a TIPS liquidity discount (TIPS trade less actively than nominal Treasuries, depressing TIPS yields relative to fair value, which subtracts roughly 5 to 15 bps from the breakeven). The "true" expected inflation sits somewhere between the breakeven minus the risk premium and the breakeven plus the liquidity discount. A rough midpoint adjustment puts it about 5 to 15 bps below the raw breakeven.
Survey-based expectations. The NY Fed Survey of Consumer Expectations publishes median 1-year and 3-year ahead CPI forecasts monthly. These tend to be more volatile than market-based breakevens and can lag turning points, because households anchor heavily on recent gasoline and grocery prices. The University of Michigan survey provides similar data at a longer 5-to-10-year horizon. Neither survey accounts for the inflation risk premium, so they are closer to pure expected inflation than the breakeven is.
In practice, portfolio managers cross-reference both. When market breakevens and survey expectations diverge sharply, one of the two is mispricing risk, and that gap is often tradeable.
Three episodes illustrate how dramatically expectations can reprice the curve.
1980 to 1981. Inflation expectations were fully unanchored. The 10Y nominal yield peaked near 16%, partly because the market priced in sustained double-digit CPI inflation. The Fed, under Volcker, had to push the Fed funds rate above 19% to break those expectations. The subsequent collapse in breakevens drove one of the largest bull flattening moves in modern history.
2021 to 2022. Supply chain disruptions and fiscal stimulus pushed actual CPI above 8% year-over-year. Over roughly 18 months, the 10Y breakeven rose from near 2.0% to approximately 3.5%. The Fed's delayed response kept the policy rate near zero through early 2022, holding real yields deeply negative. Negative real yields compressed the curve and prolonged risk asset inflation. Once the Fed began hiking in March 2022, real yields surged and the curve inverted sharply.
2024 to 2025. Re-anchoring. Breakevens returned toward 2.3%, consistent with the Fed's 2% target. As expected inflation stabilized, real yields were free to rise on their own fundamentals, and the curve began normalizing from its deep inversion. You can track the current level of nominal yields against historical episodes on the /levels page.
When inflation expectations rise, nominal yields tend to rise faster than expected inflation, pushing real yields higher. That environment is hostile to long-duration bonds. A portfolio running 8 years of duration loses roughly 8% in price for every 100 bps rise in yields.
The equity impact is less direct but equally important. Rising inflation expectations push stocks and bonds into positive correlation. Both assets sell off together when CPI surprises to the upside, because higher rates compress equity multiples at the same time they hurt bond prices. That positive correlation erodes the diversification benefit of a 60/40 portfolio, sometimes dramatically.
The /learn/stock-bond-correlation page covers the regime dynamics in detail. The practical implication for asset allocators: monitor the 10Y breakeven as a leading indicator of the correlation regime, not just as a bond pricing input.
What is the difference between breakeven inflation and expected inflation?
The breakeven is the nominal yield minus the TIPS yield. It includes an inflation risk premium (roughly +10 to +30 bps) and embeds a TIPS liquidity discount (roughly -5 to -15 bps). True expected inflation is lower than the raw breakeven by approximately the net of those two adjustments.
How does the Fed use inflation expectations?
The Fed monitors breakevens and surveys as real-time indicators of credibility. If long-run breakevens drift above 2.5%, the Fed interprets that as a signal that markets doubt its commitment to the 2% target, which typically accelerates the pace of tightening.
Why do inflation expectations affect the entire yield curve?
Because the Fisher decomposition applies at every maturity. A rise in expected inflation at the 10-year horizon pulls 10Y nominal yields up. If short-run expectations stay anchored, the curve steepens. If expectations rise across all maturities simultaneously, the entire curve shifts up in a parallel move.