A daily series, not a countdown clock
The 10-year minus 2-year Treasury spread is one of the most quoted numbers in American financial journalism. It is also one of the most over-interpreted. The series is real, documented, and reproducible. The popular claim that it predicts a recession “in about X months” is not supported by the primary sources that describe it.
Start with the series itself. The Federal Reserve Bank of St. Louis publishes it as T10Y2Y, the 10-Year Treasury Constant Maturity Minus 2-Year Treasury Constant Maturity. As of the retrieval date for this piece, the latest observation was 0.35 percent on November 6, 2026. Units are percent, not seasonally adjusted, frequency daily. The table data page gives a date range of June 1, 1976 to November 6, 2026.
Those details matter before any interpretation. A daily series is not a monthly one. A not-seasonally-adjusted series is not a seasonally adjusted one. And a series whose values are subject to revision is not a fixed historical record.
How the spread is built
FRED’s notes are explicit. The series is calculated as the spread between the 10-Year Treasury Constant Maturity (BC_10YEAR) and the 2-Year Treasury Constant Maturity (BC_2YEAR). Both underlying series are published by the U.S. Treasury Department. Starting with the update on June 21, 2019, the Treasury bond data used in calculating FRED’s interest rate spreads is obtained directly from the U.S. Treasury Department.
That construction note is the first thing to check when you rebuild the chart. If your source pulls yields from a different vendor, or splices pre-2019 and post-2019 vintages without saying so, your spread will not match T10Y2Y exactly. The differences are usually small. They are not always small enough to ignore at the margin, which is where inversions live.
FRED also states that all data are subject to revision. A chart that treats the current vintage as the historical truth is making a claim the source does not make.
Why the “slow fuse” framing is tempting
The metaphor is appealing because inversions have preceded recessions. Rosenberg and Maurer, writing in the New York Fed’s Economic Policy Review, state that since the 1970s an inverted yield curve has been a reliable signal of an imminent recession. That is a sourced claim about a signal, not a schedule.
Johansson and Meldrum, in a 2018 FEDS Note, show that the ten-year minus three-month term spread narrowed prior to each of the six most recent NBER-dated recessions and that the yield curve was inverted according to this measure prior to five of those recessions. Note the measure: ten-year minus three-month, not ten-year minus two-year. The two spreads are related but not interchangeable, and a chart that silently swaps one for the other is not reproducible.
What the sources do not provide is a fixed lead time. The phrase “imminent recession” is doing real work in the Rosenberg-Maurer sentence, and it is not a number of months. If you want a lead-time statistic, you have to compute it yourself from a stated measure, a stated inversion rule, and a stated recession chronology. The article you are reading does not supply one, because the retrieved sources do not.
The decomposition that changes the reading
Rosenberg and Maurer describe the term spread as reflecting a combination of underlying factors. Its largest component is investors’ expectations about future short-term interest rates. The remainder is a term premium that compensates investors for holding longer-term securities.
This is the most useful teaching device in the yield-curve literature. A flat curve driven by expected rate cuts is not the same signal as a flat curve driven by a compressed term premium. Rosenberg and Maurer put it directly: normally the term premium provides a buffer that prevents minor variations in interest rate expectations from inverting the yield curve, but when the term premium is small and the yield curve is relatively flat, this buffer disappears.
Their 2006-2007 case study is the cleanest illustration. The term spread model passed a 25 percent twelve-month recession probability threshold from August 2006 to May 2007, giving probabilities up to 37 percent, while the expectations component model gave probabilities below 18 percent. The two models disagreed about the same inversion. The authors are candid about the limit: they state they do not have enough historical data to reach a definitive conclusion about which model is superior.
For a chart critic, the lesson is concrete. An inversion annotated with a single probability is hiding a specification choice. Ask which component moved, and ask which model produced the number.
Model sensitivity is not a footnote
Johansson and Meldrum provide the clearest published statement of the problem. They find that a model relating the probability of a recession at some point within a year to the slope of the yield curve implies that the probability of a recession has risen as the yield curve has become flatter. But they also find that the predicted probability is lower if the model is extended to account for more information from the yield curve or from corporate bond spreads, or if the slope is adjusted to account for term premiums.
Their early-2008 example is the one to keep in mind. During the most recent recession, the univariate probit model’s predicted probability of a recession in the next year fell close to zero in early 2008, while survey-based measures at that time indicated much higher probabilities. The model was not merely imprecise. It pointed the wrong way during the event it was supposed to forecast.
That is why any recession probability quoted from a probit model should carry its sample period, its specification, and its confidence interval. A point estimate alone overstates precision. The FEDS Note’s own figures show confidence intervals wide enough that a single number is not a forecast.
Recession dates are retrospective
The NBER’s Business Cycle Dating Committee maintains the chronology of U.S. business cycles. Expansions are the periods between a trough and a peak; recessions are the periods between a peak and a trough. The committee’s approach to determining turning-point dates is retrospective. It waits until sufficient data are available to avoid the need for major revisions to the chronology.
There is also no fixed rule about which measures contribute information to the dating process or how they are weighted. The committee emphasizes economy-wide measures and has in recent decades put the most weight on real personal income less transfers and nonfarm payroll employment, but the weighting is a judgment, not a formula.
This has a direct consequence for any chart that shades recessions behind the yield curve. The shading is information we have now, not information a reader had at the time. A chart that does not say so invites the reader to see a cleaner signal than existed in real time.
A reproducible checklist
If you are rebuilding this figure for a post, a class, or a newsroom graphic, the following steps will keep the chart honest.
- Name the series and the measure. Pull T10Y2Y from FRED and state that it is the 10-year constant maturity minus the 2-year constant maturity. If you use the 10-year minus 3-month spread instead, say so, because the recession-probability literature often uses that measure.
- Record the vintage. Note the retrieval date and the latest observation. FRED states that all data are subject to revision, so a chart without a vintage is not reproducible.
- Respect the frequency. T10Y2Y is daily. If you aggregate to monthly, state the rule: last observation, monthly average, or month-end. Each gives a different picture near an inversion.
- Annotate recessions as retrospective. Use NBER peak and trough dates and label the shading accordingly. Do not imply the shading was available in real time.
- Show the alternative measure. Plot 10-year minus 3-month alongside 10-year minus 2-year when the claim depends on inversion timing. The two can diverge, and the divergence is part of the story.
- If you quote a probability, quote its context. Give the model, the sample period, and the confidence interval. A bare percentage is a specification in disguise.
Rule of thumb
Report the spread as a signal with uncertainty, not as a timer. State the measure, the sample, and the model specification. When the curve inverts, the defensible sentence is that an inversion has preceded recessions in the postwar record and that the lead time has varied. The indefensible sentence is that a recession will begin in a stated number of months.
The slow-fuse metaphor is not wrong because inversions are meaningless. It is wrong because it converts a probabilistic signal into a schedule the underlying sources do not provide. A chart that says so is more useful than one that pretends to know when the fuse reaches the powder.
Frequently asked questions
Is the 10-year minus 2-year spread the same as the 10-year minus 3-month spread?
No. They use different short-maturity yields and can give different readings, especially near an inversion. Much of the recession-probability literature, including the Johansson and Meldrum FEDS Note, uses the 10-year minus 3-month measure. A chart should state which one it plots.
Does an inversion mean a recession is coming within a year?
The retrieved sources describe inversions as having preceded recessions and as a reliable signal of an imminent recession since the 1970s. They do not establish a fixed lead time. Treat the inversion as a signal whose timing is variable, and do not quote a month count without computing it from a stated measure and chronology.
Why do different models give different recession probabilities?
Because the spread is not the only relevant variable. Johansson and Meldrum show that probabilities fall when the model incorporates more yield-curve information, corporate bond spreads, or a term-premium adjustment. Rosenberg and Maurer show that decomposing the spread into expectations and term-premium components can move the estimated probability substantially, as in the 2006-2007 episode.
Where can I get the underlying data?
The spread is available from FRED as T10Y2Y, with the underlying 10-year and 2-year constant-maturity yields published by the U.S. Treasury Department. Recession dates come from the NBER Business Cycle Dating Committee. Both are public and citable.