Know Which Yield Curve a Chart Shows Before You Worry About “Inversion”
Two honest charts can disagree about the yield curve on the same day because they subtract different short-term yields. Name the pair first, then read the story.
Source: U.S. Treasury constant-maturity yields (10-year, 2-year, 3-month)
Educational only. Not investment advice. The yields below are a hypothetical example built to show how spreads work, not real market data for any date.
Two posts land in your feed an hour apart.
The first: “The curve is STILL inverted.” A red line sits below zero.
The second: “The curve has been positive for months. Inversion is over.” A green line sits above zero.
Both screenshots carry the same date. Both cite Treasury data. Neither account is lying. They just didn’t subtract the same two numbers.
“The curve” is not one number
A yield curve is the set of Treasury yields across maturities on one date: three-month bills, two-year notes, ten-year notes, and so on. A spread is one of those yields minus another.
When someone says “the curve is inverted,” they almost always mean one specific spread is below zero. The trouble is that there are several popular spreads, and they don’t always share a sign:
- 10Y−2Y: ten-year yield minus two-year yield. The one most retail headlines use.
- 10Y−3M: ten-year yield minus three-month bill yield. A pair many researchers prefer because the short leg sits closer to money-market conditions.
- 10Y−FF: ten-year yield minus a federal funds rate series. This mixes a market yield with a policy-rate reference, so its conventions need labeling.
Same curve, different slices. Each answers a slightly different question.
Hypothetical Tuesday, read properly
Say on one fictional Tuesday the Treasury curve looks like this:
- 3-month bill: 4.60%
- 2-year note: 3.90%
- 10-year note: 4.20%
Now do the subtraction (one basis point is 0.01 percentage point):
- 10Y−2Y = 4.20 − 3.90 = +30 basis points. Positive. Upward-sloping for that pair.
- 10Y−3M = 4.20 − 4.60 = −40 basis points. Negative. Inverted for that pair.
Post one charted 10Y−3M. Post two charted 10Y−2Y. Both captions dropped the pair name, so readers saw a contradiction where there was only a labeling gap.
This shape isn’t exotic. When the very short end stays high (for example because the policy rate hasn’t come down yet) while two-year yields price in lower rates ahead, the front of the curve can kink: bills above two-year notes, ten-year somewhere between. One spread reads positive while another reads negative.
The careful sentence
The headline “the curve is inverted” is incomplete. A careful notebook line looks more like this:
On [date], using Treasury constant-maturity series from [source], 10Y−3M was −40 bp and 10Y−2Y was +30 bp. Front end kinked: 3M above 2Y. No forecast conclusion.
Notice what that line does. It names both pairs, gives units, names the source, and stops before predicting anything.
Why feeds keep mixing the pairs
- The pair name is small or missing. Chart titles say “Yield Curve” and bury “10Y minus 2Y” in a footnote, if it’s there at all.
- “Inverted” is a story word. It gets repeated long after the caption lost its pair label.
- Vendors differ. One dashboard defaults to 10Y−2Y, another to 10Y−3M, a third to a funds-rate spread. Screenshots travel without the settings panel.
- Levels and changes get blended. “Steepening” describes a change over a window. “Inverted” describes a level on a date. A spread can be steepening and still inverted.
What a spread doesn’t tell you
A negative spread is a description of a sign on one date. It is not a recession start date, a stock call, or a Fed forecast. Historical links between some inversions and later recessions are statistical stories with small samples, long and variable lags, and regime changes. Different pairs have different track records and different failure modes. Picking the pair that agrees with your view is the opposite of literacy.
The 30-second checklist
Before you repost a “curve” chart:
- Which two maturities were subtracted? (10Y−2Y, 10Y−3M, 10Y−FF, something else?)
- What date and what source series?
- Is the number a level (spread on a date) or a change (over a window)?
- Are the units basis points or percentage points?
- If two charts disagree, did you check whether they used different short legs?
If you can’t name the pair, you don’t yet have a claim. You have a color.
Try it yourself
The free InsightMeter guide walks through each common spread, curve-shape vocabulary, levels vs changes, and what spreads do not prove.
- Free guide (no login): Yield-curve spreads literacy
- Practice on real series: a free InsightMeter account shows a short educational teaser window on selected spreads.
If you later want longer spread history and CSV export for your own notebook, that’s what Pro is for. Try the free version first and see whether the workflow helps you.
Educational content from InsightMeter, operated by To You Education (Hong Kong) Limited. Not investment, legal, or tax advice. Spreads describe relationships among yields on stated dates; they are not forecasts or trading signals. No guaranteed returns.