What is an Inverted Yield Curve? Definition, Formula, and Example
An inverted yield curve occurs when short-term Treasury yields exceed long-term Treasury yields, signaling that bond investors expect weaker growth and lower rates ahead — and it has preceded every U.S. recession since 1955.
What is an Inverted Yield Curve?
An inverted yield curve is a condition in the U.S. Treasury market where short-dated bonds yield more than long-dated bonds. Under normal conditions, investors demand higher yields for lending money over longer periods because of inflation risk, duration risk, and uncertainty — producing an upward-sloping curve. When the curve inverts, the market is pricing in rate cuts, slowing growth, or both. The most-watched measure is the spread between the 10-year Treasury yield and the 2-year Treasury yield (the "2s10s"), though the 10-year minus 3-month spread is the version the Federal Reserve's research literature favors. Inversion is the bond market's single most reliable recession signal: every U.S. recession since 1955 has been preceded by an inversion, with only one false positive (1966).
How the Inversion Is Measured
The curve is not inverted or not-inverted as a binary state — it is measured as a spread in basis points:
2s10s spread = 10-year Treasury yield − 2-year Treasury yield
- Spread > 0: normal (upward-sloping) curve
- Spread = 0: flat curve
- Spread < 0: inverted curve
Analysts also track the depth (most negative print) and duration (consecutive days inverted) of the inversion. A brief intraday dip below zero carries less signal weight than a sustained inversion lasting months. The 10-year minus 3-month spread, used in the New York Fed's recession probability model, inverts when the policy rate is expected to fall sharply within a year.
Worked Example: The 2022–2024 Inversion
In July 2022, the 2-year Treasury yield rose above the 10-year yield as the Federal Reserve hiked aggressively. By March 2023, the 2-year yielded roughly 5.05% while the 10-year yielded about 3.55% — a spread of −150 basis points, the deepest inversion since 1981. The curve remained continuously inverted for over 700 days, the longest inversion on record, before re-steepening in late 2024 as the Fed began cutting rates. Traders tracking the spread on the 2s10s saw the classic sequence: inversion during the hiking cycle, then a "bull steepener" (short rates falling faster than long rates) as the easing cycle began. Notably, the much-forecast recession did not arrive on schedule — a reminder that the signal predicts direction, not timing.
When Traders Use It
- Recession timing models: The average lag from first inversion to recession is 12–18 months, with a range of 6 to 24 months. Macro funds position defensively in the year following a sustained inversion.
- Bank stock analysis: Banks borrow short and lend long, so an inverted curve compresses net interest margins. Deep inversions historically pressure regional bank earnings.
- Equity sector rotation: Inversions favor defensive sectors (utilities, staples, healthcare) over cyclicals, and growth over value when rate cuts are anticipated.
- Curve trades: Fixed-income traders position directly in steepeners and flatteners using Treasury futures spreads rather than taking outright duration risk.
Limitations and Common Misconceptions
The inversion does not cause recessions; it reflects rate expectations. The lag is long and variable, so selling equities the day the curve inverts has historically been a poor trade — stocks often rally for a year or more after the initial inversion. The 2022–2024 episode produced no recession at all, reviving debate about whether post-QE term premium distortions have degraded the signal. Finally, "un-inversion" (re-steepening) is often the more dangerous moment: recessions have historically begun after the curve re-steepens, not while it is inverted.