T10Y3M 2022-2024 Inversion: The Longest Since Volcker 1978-1980

The T10Y3M inversion that stretched from October 25, 2022 to December 13, 2024 lasted 626 consecutive trading days in negative territory — the longest uninterrupted sequence documented since the Volcker inversion of October 1978 to August 1980, with a depth trough of -189 basis points reached on May 4, 2023.

Documenting this episode month by month illuminates both the most rapid monetary transmission mechanism since 1980 and the anomaly of a probit probability sustained over sixteen months above 50 percent without an actual recession.

The trigger — the most rapid Fed tightening cycle since Volcker

The 2022-2024 inversion finds its mechanical origin in the most rapid tightening cycle imposed by the Federal Open Market Committee since Paul Volcker. Between the first hike on March 16, 2022 (from 0.00-0.25 percent to 0.25-0.50 percent) and the final hike on July 26, 2023 (from 5.00-5.25 percent to 5.25-5.50 percent), the FOMC executed eleven cumulative hikes totaling 525 basis points over sixteen months. Four consecutive 75-basis-point hikes — in June, July, September, and November 2022 — concentrated most of the tightening in a single quarter.

During this sequence, the 3-month Treasury yield (FRED series DTB3) rose from 0.12 percent in early March 2022 to 5.55 percent in late July 2023, faithfully tracking the Fed Funds effective rate with a constant gap of around five to fifteen basis points. The 10-year yield (DGS10), by contrast, rose only from 1.73 percent to a peak of 4.98 percent reached on October 19, 2023, reflecting a collective anticipation of return toward a lower long-run equilibrium rate. This magnitude divergence — 543 basis points of increase on the 3-month versus 325 basis points on the 10-year — mechanically explains the T10Y3M crossing into negative territory.

The effective crossing occurred on October 25, 2022 at exactly one basis point below zero. Across the seven business days prior, T10Y3M had oscillated between +0.08 percent and -0.01 percent, indicating a boundary zone preceding the crossing. This crossing came exactly sixteen months after the cycle’s first Fed hike — the standard duration observed historically between first tightening and effective inversion. The conceptual discussion of the T10Y3M as recession signal situates this trigger within the academic interpretive framework.

The monthly trajectory — from inversion to the May 2023 trough

Across the seven months following the initial crossing, T10Y3M progressively dug into negative territory, reaching its historical trough of -189 basis points on May 4, 2023. On that date, the 3-month yielded 5.12 percent and the 10-year yielded 3.23 percent — a configuration the literature labels “extreme deep inversion,” unprecedented since the Volcker episode.

The monthly trajectory decomposes into three sub-phases. The first, from late October 2022 to late January 2023, sees the spread dig from -1 basis point to -85 basis points as the Fed continues tightening and the 10-year corrects modestly (from 4.05 percent to 3.53 percent). The second sub-phase, from February to May 2023, sees the inversion deepen sharply — from -85 to -189 basis points — under the joint effect of additional Fed hikes (from 4.50-4.75 percent to 5.00-5.25 percent) and a 10-year drop triggered by the regional banking episode of March 2023 (failures of Silicon Valley Bank, Signature Bank, First Republic). The bond market then anticipated an imminent recession, driving the 10-year to 3.23 percent while the 3-month remained above 5 percent.

The third sub-phase, from June to October 2023, sees depth attenuate (-189 to roughly -100 basis points) under the effect of a 10-year rebound, reaching its cycle peak at 4.98 percent in October 2023. This rebound reflects a partial return of growth expectations and progressive absorption of the March banking shock. The 3-month stays stable around 5.40-5.55 percent, reflecting the Fed pause at 5.25-5.50 percent since July 2023.

Over this period, the NY Fed probit model peaked at 71 percent conditional recession probability in June 2023 — a level consistent with historical peaks ahead of the 1980 and 2008 recessions. The detail of the probit formalization of the T10Y3M signal documents the exact computation and full probability trajectory across the 2022-2024 window.

Direct comparison with the Volcker 1978-1980 inversion

The only T10Y3M inversion longer historically is the October 1978 to August 1980 episode under Paul Volcker’s Federal Reserve chairmanship. That inversion lasted roughly 460 consecutive trading days — markedly shorter than the 2022-2024 episode in duration — but reached a maximum depth of -460 basis points in March 1980, 2.4 times deeper than the 2023 trough of -189 basis points.

Three structural differences distinguish the two episodes and illuminate their contrasting macroeconomic outcomes. The first is pre-tightening inflation: 14.8 percent peak in March 1980 versus 9.1 percent in June 2022. Volcker faced a more entrenched inflationary regime, anchored by oil shocks and by a decade of double-digit inflation; the tightening needed to break that regime required policy rates of 19-20 percent and a corresponding inversion trough.

The second difference is the cyclical composition of the outcome. The 1978-80 episode produced two distinct recessions: January-July 1980 (six months, brief recession triggered by Credit Control Act application) then July 1981-November 1982 (sixteen months, deep recession). This “double-dip” sequence is attributed to Volcker’s monetary strategy of maintaining high policy rates despite the initial recession to durably anchor inflation expectations. Eco3min’s analysis of the Volcker disinflation traces this episode. The 2022-2024 episode, by contrast, produced no NBER-dated recession at the date of this analysis.

The third difference is the fiscal regime. The 1978-1980 period unfolded under relative fiscal discipline — federal deficit below 3 percent of GDP on average. The 2022-2024 period unfolded under continuous fiscal expansion — deficit above 5 percent of GDP, a level historically associated with deep recessions or major conflicts. This third difference is invoked by recent literature (Bauer-Mertens 2023; Brookings Institution analyses) as partial explanation for the outcome asymmetry — 2022-2024 monetary contraction was partly offset by fiscal support absent in 1978-80.

This comparison highlights that depth alone does not determine recessionary outcome. The combination of depth, duration, and fiscal context determines effective transmission to the economic cycle. The historical detail of the Volcker episode is documented in central-bank policy and rate-cycle transmission analyses.

The plateau phase and the soft-landing debate

Between June 2023 and July 2024, T10Y3M remained in deeply negative territory, oscillating between -120 and -180 basis points without signs of imminent un-inversion. During this thirteen-month plateau, the combination of a Fed Funds rate held at 5.25-5.50 percent and a 10-year contained within a 3.80-4.98 percent band produced an inversion persistence unmatched historically. No prior cycle had sustained an inversion depth greater than 100 basis points for more than twelve consecutive months.

This persistence must be set against the macroeconomic evolution observed over the same period. Contrary to consensus expectations of a Q4 2023 or Q1 2024 recession (Philadelphia Fed Survey of Professional Forecasters, Bloomberg consensus, Blue Chip Economic Indicators), U.S. GDP instead accelerated by 2.1 percent annualized in 2023 and 2.8 percent in 2024. Household consumption held up through gradual depletion of post-pandemic excess savings; non-residential investment was supported by Inflation Reduction Act, CHIPS Act, and IIJA programs; the labor market remained tight (unemployment between 3.6 percent and 4.1 percent).

This divergence between probit signal (elevated conditional recession probability) and real economy (sustained growth) fueled the 2024-2025 academic debate on signal non-conversion. Three families of hypotheses dominate the analysis: offsetting fiscal expansion, gradual erosion of post-pandemic excess savings, sectoral subsidy policies. None invalidates the monetary signal reading per se; all propose counter-cyclical stabilizers absent in the historical calibration cycles.

The final un-inversion of December 2024

The exit from negative territory occurred on December 13, 2024, after 626 consecutive trading days in inversion. The un-inversion mechanic operated primarily through the short leg: the 3-month yield collapsed from 5.38 percent on July 31, 2024 to 4.30 percent on December 31, 2024, a direct consequence of three Fed cuts in September 2024 (50 basis points), November 2024 (25 basis points), and December 2024 (25 basis points). The 10-year yield, by contrast, remained contained in a 4.15-4.55 percent band over the same period.

This un-inversion-from-below mechanic — short-rate collapse faster than long-rate decline — historically corresponds to the un-inversion profile observed ahead of the 2001, 2008, and 2020 recessions. The August to December 2024 T10Y3M un-inversion documents the precise daily sequence and analyzes the operational implications of the exit.

The final crossing took place over three trading days in oscillation around zero: -8 basis points on December 11, -3 basis points on December 12, +2 basis points on December 13, 2024. This smooth transition contrasts with the initial October 25, 2022 crossing, which had been sharper (-1 basis point after a day in positive territory at +12 basis points). As of May 16, 2026, seventeen months after un-inversion, T10Y3M oscillates around +70 to +90 basis points — typical expansion-cycle values with no inversion in sight.

Last updated — 16 June 2026