Comparing a TIPS bond against a same-maturity nominal Treasury reveals something genuinely useful: the market’s own real-time forecast of average future inflation.
How it works
Subtracting the TIPS real yield from the nominal Treasury yield of the same maturity gives the breakeven inflation rate — the average annual inflation rate at which both bonds would produce the same total return.
What this does not include
This does not include the “inflation risk premium” academic research suggests is embedded in breakeven rates — meaning breakeven inflation isn’t a pure, unbiased inflation forecast, but a market price that also reflects investors’ compensation for inflation uncertainty itself.
How to use this calculator
- Enter the nominal Treasury yield and the TIPS real yield for the same maturity.
A worked example
A nominal Treasury yield of 4.5% against a TIPS real yield of 2.0%: breakeven inflation rate = 4.5 − 2.0 = 2.5% — the inflation rate at which both bonds would deliver the same return.
What the variables mean
| Variable | Meaning |
|---|---|
| Nominal yield | Yield on a standard (non-inflation-protected) Treasury bond |
| TIPS real yield | Yield on an equivalent-maturity Treasury Inflation-Protected Security |
Edge cases worth knowing
The breakeven rate is the market’s implied inflation expectation, not a guarantee. If actual inflation runs above this rate, TIPS outperform; if below, nominal bonds outperform — the breakeven is simply the crossover point.
A negative nominal yield has no meaning for this comparison, so the calculator declines to show a result for that input.
Frequently asked questions
Why is breakeven inflation watched so closely by economists?
It’s one of the few real-time, market-based inflation expectation measures available, updated continuously as bond prices trade, unlike survey-based inflation expectations that update only periodically.
Can breakeven inflation go negative?
Yes, in unusual circumstances — it would imply the market expects deflation on average over that maturity, though this has historically been rare and typically brief.
Does breakeven inflation predict actual future inflation accurately?
It’s a useful market-based signal, but not a perfect forecast — actual realized inflation has at times diverged meaningfully from what breakeven rates implied in advance.
