3m10y spread: Fed recession signal explained
By Ken Chigbo, Founder, KenMacro. Published 2026-05-13.
Quick answer
The 3m10y spread is the yield on the 10-year US Treasury note minus the yield on the 3-month Treasury bill. It is the Federal Reserve’s preferred recession indicator. When it inverts, meaning short rates exceed long rates, a US recession has historically followed within roughly twelve to eighteen months.
What is 3m10y spread?
The 3m10y spread measures the difference between the 10-year Treasury yield and the 3-month Treasury bill yield, expressed in basis points. A positive spread reflects a normal upward-sloping curve where investors demand more yield for longer duration. A negative spread, known as inversion, signals that money markets price the front end above the long end, typically because the Fed has tightened policy aggressively while the long end discounts slower future growth and lower terminal rates. Fed research, notably work by Estrella and Mishkin, established this specific tenor pair as the most statistically reliable curve-based recession predictor in post-war US data.
How traders use 3m10y spread
Macro desks track the 3m10y spread daily using FRED series T10Y3M or live Bloomberg tickers. Sustained inversion shifts positioning across asset classes. Rates traders fade steepeners during deep inversion and prepare for bull steepening once the Fed pivots, which historically marks the recession entry point. FX desks watch the spread because dollar strength tends to peak around peak inversion, with cyclical currencies like AUD and EUR underperforming. Equity allocators rotate from cyclicals into defensives and duration once the curve has been inverted for several months. The signal is structural, not tactical: the desk treats single-day moves as noise and focuses on multi-week averages, the depth of inversion, and the timing of the eventual re-steepening, which is usually the more actionable trigger.
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Common misconceptions about the 3m10y spread
First, inversion does not cause recession; it reflects monetary policy already in restrictive territory relative to growth expectations. Second, the signal is not immediate. The lag from first inversion to NBER-dated recession has historically ranged from several months to nearly two years, which is too wide for short-term positioning. Third, the 2s10s spread, while widely cited in retail commentary, has a weaker track record than the 3m10y in Fed studies. Fourth, re-steepening from deep inversion is not bullish; it has historically coincided with the onset of recession as the Fed begins cutting the front end.
Frequently asked
Why does the Fed prefer the 3m10y over the 2s10s?
The 3-month bill yield is anchored directly to the current federal funds rate, making it a cleaner read on the stance of monetary policy than the 2-year note, which already prices in expected Fed moves. Estrella and Mishkin’s research at the New York Fed found the 3m10y had stronger predictive power for US recessions across multiple decades of data. The Fed’s own recession probability models, published by the New York Fed, use this specific spread as their primary input.
Has the 3m10y spread ever given a false signal?
The 3m10y has a strong but imperfect record. It briefly inverted in 1966 without an immediate NBER-dated recession, though growth slowed materially. Every other meaningful inversion since the late 1960s has been followed by recession within roughly twelve to eighteen months. The desk treats brief, shallow inversions with more caution than sustained deep ones. Confirmation typically requires the spread to remain negative for at least one quarter rather than dipping intraday.
What does it mean when the 3m10y un-inverts?
Re-steepening from inversion, particularly bull steepening where the front end rallies faster than the long end, has historically marked the point at which the Fed begins cutting rates in response to deteriorating data. This is often the most dangerous phase for risk assets, not the safest. Equity drawdowns and credit widening tend to accelerate once the curve normalises, because by then unemployment is rising and earnings are being revised lower.
Where can traders track the 3m10y spread in real time?
The cleanest free source is the FRED database maintained by the St Louis Fed, series code T10Y3M, which updates daily. Bloomberg and Refinitiv terminals carry live tick data. The New York Fed publishes a monthly recession probability series derived from the spread, which smooths daily noise. The desk recommends watching weekly closing values rather than intraday prints, since liquidity in the 3-month bill can produce small distortions around auction settlement dates.
Related from the desk
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