A yield curve inversion occurs when short-term Treasury yields rise above long-term Treasury yields — most commonly when the 2-year yield exceeds the 10-year yield. The Federal Reserve Bank of New York tracks the 10y-2y spread as a historically reliable recession predictor, with every U.S. recession since 1955 preceded by an inversion.
Under normal conditions, the Treasury yield curve slopes upward — investors demand higher yields for locking up money longer (term premium). Inversion flips this: short-term yields exceed long-term yields, signaling that markets expect economic slowdown, lower future interest rates (Fed cuts), or both. The most watched inversion signal is the 10-year minus 2-year Treasury spread (10y-2y). FRED publishes it in real time (https://fred.stlouisfed.org/series/T10Y2Y). The Federal Reserve Bank of New York's recession probability model (https://www.newyorkfed.org/research/capital_markets/ycfaq) uses the 10y-3m spread (10-year minus 3-month) — historically the highest-probability recession predictor with roughly a 12-month lead time. For SMB borrowers: yield curve inversion matters because it directly affects lending conditions. Banks fund long-term loans with short-term deposits — when the curve inverts, net interest margins (NIM) compress or turn negative on new originations, making banks more selective about business lending. The 2022-2023 inversion (deepest since the early 1980s) contributed to the tightest business lending standards in the Fed's Senior Loan Officer Opinion Survey (SLOOS, https://www.federalreserve.gov/releases/sloos/) since the 2008 financial crisis. Historical track record: the 10y-2y curve inverted before the 1981, 1990, 2001, 2008, and 2020 recessions. It inverted again in 2022 and remained inverted through 2024.
Not a guarantee, but historically the most reliable leading indicator available. The New York Fed's model estimates recession probability from the 10y-3m spread with roughly 12 months of lead time. Every U.S. recession since 1955 was preceded by an inversion — though timing varies (inversion can persist 12-24 months before a recession begins, or the economy can avoid a full recession altogether, as in 1998).
Banks borrow short (deposits, Fed funds) and lend long (term loans). When short rates exceed long rates, new loans often price near or below the bank's funding cost — compressing or eliminating net interest margin. Banks respond by tightening credit standards, reducing loan-to-value ratios, and raising spreads on riskier credits including SMB loans. The Fed's SLOOS (federalreserve.gov/releases/sloos/) documents these tightening cycles in real time.
FRED at fred.stlouisfed.org/series/T10Y2Y (10y-2y spread, updated daily) and fred.stlouisfed.org/series/T10Y3M (10y-3m spread). The U.S. Treasury publishes daily yield curve rates at fiscaldata.treasury.gov/datasets/treasury-nominal-real-yield-curves/. The New York Fed's recession probability model is updated monthly at newyorkfed.org/research/capital_markets/ycfaq.