Yield Curve Definition: A yield curve is a graph that plots the yields of bonds of the same credit quality, usually government bonds, against their time to maturity, from a few months to 30 years. Its shape shows how much more investors demand for lending money for longer: a normal curve slopes upward, while a flat or inverted curve signals that markets expect interest rates and growth to fall.
What Is a Yield Curve?
Lend money for three months and you might earn 4%. Lend it for 10 years and you might earn 4.5%, or, in some years, less than you would for three months. The yield curve is the line that connects those numbers for every maturity in between.
Most traders mean the US Treasury curve when they say “the yield curve,” because US government bonds are the deepest and most traded debt market in the world. Every country that issues debt in its own currency has one, though. Using a single issuer removes credit risk from the comparison, so the only thing that changes along the curve is time.
Longer loans normally pay more. Investors tie up their money for longer, face more uncertainty about inflation, and see bigger price swings when rates change. That extra return for waiting is called the term premium, and it is why the curve usually slopes upward.
How Does the Yield Curve Work?
Two different forces shape the two ends of the curve. The short end, up to about two years, follows the federal funds rate and what markets expect the central bank to do at its next few meetings. The long end, 10 to 30 years, reflects expectations for growth and inflation over a decade, plus the term premium. Traders summarise the shape with a spread, most often the 10-year yield minus the 2-year yield, known as 2s10s.
A bank shows why the shape matters to the real economy. Say it pays depositors 2%, in line with short-term rates, and lends for 10 years at 4%. Its margin is 2 points, and it has every reason to lend.
Now the central bank raises short rates to 5% to fight inflation, while 10-year yields rise only to 4.2% because investors expect a slowdown. Funding now costs more than new long-term loans earn, so the bank tightens its lending standards. Less credit reaches companies and households, and that squeeze is one reason a flat or inverted curve so often comes before an economic downturn.
Types of Yield Curve
- Normal curve: long yields sit above short yields. This is the usual shape during economic expansions.
- Steep curve: the gap between short and long yields is wide. It often appears early in a recovery, when the central bank keeps short rates low and investors expect growth and inflation to pick up.
- Flat curve: short and long yields are close together. This shape tends to appear late in a hiking cycle, when markets doubt that rates can keep rising.
- Inverted curve: short yields sit above long yields. Markets expect the central bank to cut rates in the future, usually because they expect a slowdown or recession.
Yield Curve vs. Interest Rate
| Yield Curve | Policy Interest Rate | |
|---|---|---|
| What it is | A set of market yields across many maturities | One overnight rate chosen by the central bank |
| Who sets it | Bond investors, with the central bank anchoring the short end | The central bank’s policy committee |
| How often it changes | Every second the bond market is open | At scheduled policy meetings |
| What it reveals | Market expectations for rates, growth and inflation | The central bank’s current policy stance |
Why Is the Yield Curve Important for Traders?
The curve is the market’s forecast of the path of interest rates, written in prices rather than words. When the 2-year yield jumps after a strong jobs report, traders are pricing a more aggressive central bank. When the 10-year falls while the 2-year holds, they are pricing weaker growth ahead. Currency and equity traders read these moves because they show how investors’ expectations shift before the central bank acts.
Its reputation as a recession signal comes from a strong track record. An inverted US curve has come before every recession since the late 1960s. Economist Campbell Harvey documented the link in his 1986 dissertation, and the New York Fed publishes a recession-probability model built on the spread between 3-month and 10-year yields.
Still, the signal has clear limits. The US 2s10s spread inverted in July 2022 and went more than a full percentage point negative in July 2023, its deepest inversion since the early 1980s. The curve stayed inverted for more than two years, one of the longest stretches on record, yet no recession had been declared by the time it turned positive again in 2024. Central bank bond buying has also distorted the long end by pushing down term premiums, so an inversion today may carry less information than it did before large-scale quantitative easing.
Key Takeaways
- The yield curve plots the yields of same-quality bonds across maturities, and its shape shows how much investors demand for lending money for longer.
- The central bank anchors the short end through its policy rate, while bond investors set the long end based on expected growth and inflation.
- A normal curve slopes upward; a flat or inverted curve means markets expect rates, and often growth, to fall.
- Inversions squeeze banks that borrow short and lend long, which helps explain why they often come before recessions.
- The recession signal is not a timetable: lead times vary widely, and central bank bond buying can distort the curve’s shape.
What is the 2s10s spread?
It is the 10-year Treasury yield minus the 2-year Treasury yield. A positive number means the curve slopes upward, and a negative number means it is inverted.
Does an inverted yield curve guarantee a recession?
No. Inversions have come before every US recession since the late 1960s, but the gap between inversion and recession has ranged from several months to about two years, and a signal can fail. It is a warning about expectations, not a timetable.
Who controls the shape of the yield curve?
The central bank largely sets the short end through its policy rate. The long end is set by investors trading bonds, based on their expectations for growth, inflation and future rates.
What is yield curve control?
It is a policy in which a central bank caps a longer-term yield by promising to buy as many bonds as needed. The Bank of Japan pinned its 10-year yield near 0% from 2016 until it ended the policy in March 2024.
