The Yield Curve Explained

By Ryan O'Connell, CFA, FRM Published October 20, 2026
Table of Contents

    The yield curve helps investors compare the yields available on short- and long-term Treasury securities. It also helps explain a seemingly puzzling outcome: the Federal Reserve can cut its policy rate while the 10-year Treasury yield rises. Reading the curve requires understanding both the level of yields and the forces moving different maturities.

    What Is the Yield Curve?

    A yield curve plots bond yields against time remaining until maturity, using observations from the same date. The horizontal axis shows maturity; the vertical axis shows annualized yield. Comparing securities with similar risk characteristics helps isolate the relationship between yield and maturity.[1]

    The U.S. Treasury curve includes short-term bills, intermediate-term notes, and long-term bonds from the same government issuer. Familiar points include the three-month bill, two-year note, 10-year note, and 30-year bond. Our guide to U.S. Treasury securities explains these instruments in more detail.[2]

    Key Concept

    The yield curve is a snapshot across maturities. A chart showing the 10-year yield over several years answers a different question: how one maturity’s yield changed over time.

    Treasury’s published curve uses par yields: standardized maturity benchmarks derived from market quotations. Its constant-maturity rates are interpolated from a fitted curve, so a reported 10-year rate need not be the executable yield on one specific security with exactly 10 years remaining.[3]

    Watch: The Yield Curve Explained In 5 Minutes: Fed Policy vs Market Forces

    Why the Fed Strongly Influences the Short End

    The Federal Open Market Committee sets a target range for the federal funds rate, an overnight rate for borrowing reserve balances. Treasury bill yields typically move closely with this rate because they operate at similarly short horizons. The Federal Reserve uses monetary policy to pursue price stability and maximum employment.[4]

    A higher policy target generally puts upward pressure on short-term yields; a lower target generally puts downward pressure on them. However, even the short end reflects expectations. A two-year Treasury yield incorporates the outlook over two years, so it can move as investors reassess future policy before the Fed changes today’s target.[4]

    Calling maturities of roughly two years and under the short end is useful shorthand. The Fed directly targets an overnight rate; it does not set the two-year Treasury yield by announcement.

    What Moves the Long End?

    Longer yields reflect expectations over a much longer horizon, together with compensation for bearing risk. A useful conceptual relationship is:[5]

    Conceptual Long-Rate Decomposition
    Long-term nominal yield ≈ Expected average future short-term nominal rate + Term premium
    An explanatory approximation, rather than an exact calculation for every quoted Treasury par yield.

    The expected average spans the security’s life. It includes expectations about inflation and how policy may respond to economic conditions. Several influences can therefore move long yields:

    • Inflation expectations. Higher expected inflation can lead investors to require higher nominal yields, holding other influences constant. Expectations about future inflation differ from the latest reported inflation reading. See inflation expectations for that distinction.
    • Growth prospects. Stronger expected growth can support higher expected real interest rates and a higher future policy path. Weaker prospects can work in the opposite direction. Neither relationship guarantees a particular market move.[5]
    • Term premium. Investors face uncertainty when holding long-term debt instead of repeatedly investing in short-term securities. The premium associated with that risk changes over time and can be negative. It is estimated using models or surveys, rather than directly observed.[6]
    • Supply and demand. More Treasury supply relative to demand can put upward pressure on yields. Stronger demand for safety and liquidity can push Treasury prices higher and yields lower. The outcome depends on other conditions and who is buying; there is no fixed rule linking an issuance amount to a yield change.[5][7]

    These influences overlap. Inflation and growth affect expected future rates, while uncertainty and investor demand can change the term premium. Inflation expectations are already part of the expected nominal rate component; adding them again would double count them.

    Fed Policy vs. Market Forces

    Shorter Maturities

    • Closely connected to the current overnight policy rate.
    • Also respond to expectations for upcoming policy decisions.
    • Remain market-determined Treasury yields, distinct from the Fed’s target range.

    Longer Maturities

    • Reflect expected rates over many years.
    • Respond to inflation, growth, uncertainty, and investor demand.
    • Can rise or fall independently of the latest policy-rate change.

    The distinction is about the strength and channels of influence. Fed communications can change expectations across the curve, and its purchases of longer-term securities can affect long yields through demand and term premiums.[4][5]

    Normal, Flat, and Inverted Yield Curves

    These names describe the relationship between selected short and long maturities. Different parts of the same curve can slope in different directions.[8]

    Comparing common yield-curve shapes
    Shape Yield relationship Possible contributing influences
    Normal or upward-sloping Long yields exceed short yields. Higher expected future short rates, a positive term premium, or both.
    Flat Short and long yields are similar. Expected rate changes and premiums largely offset across the selected maturities.
    Inverted Short yields exceed long yields. Expected future easing, a low or negative term premium, or a combination of influences.

    An inversion can be consistent with expectations of weaker activity and lower future policy rates. Historically, inversions have been associated with elevated recession risk, but they do not establish that a recession must occur or when it would begin. Dedicated recession probability analysis also considers the indicator and model being used.[8]

    Reading the Spread: Steepening vs. Flattening

    A spread summarizes the difference between two maturities. Always state the pair and subtraction order:

    10-Year Minus 2-Year Treasury Spread
    Spread = 10-year yield − 2-year yield
    Positive means the 10-year yield is higher; negative means this pair is inverted.

    One percentage point equals 100 basis points; one basis point is 0.01 percentage point. Under this long-minus-short convention, steepening means the spread increases, while flattening means it decreases. A move from a negative spread toward zero counts as steepening.

    The curve can steepen because long yields rise relative to short yields, or because short yields fall relative to long yields. Both yields can also move in the same direction at different speeds. Equal changes in both yields leave their spread unchanged.

    Historical Example: Both Yields Fell, but the Spread Increased

    Treasury’s published par yields provide the following two historical snapshots. These are annualized yields, not current quotes.[9]

    Selected Treasury par yields, January 2 and September 18, 2024
    Maturity January 2, 2024 September 18, 2024
    3 months 5.46% 4.84%
    2 years 4.33% 3.61%
    5 years 3.93% 3.47%
    10 years 3.95% 3.70%
    30 years 4.08% 4.03%

    Starting spread: 3.95% − 4.33% = −0.38 percentage point = −38 basis points.

    Ending spread: 3.70% − 3.61% = +0.09 percentage point = +9 basis points.

    Change: +9 − (−38) = +47 basis points, a steepening of this segment.

    The two-year yield fell by 3.61% − 4.33% = −0.72 percentage point, or 72 basis points. The 10-year fell by 3.70% − 3.95% = −0.25 percentage point, or 25 basis points. The shorter yield fell more, increasing the spread.

    On September 18, the 10-year-minus-three-month spread was still 3.70% − 4.84% = −1.14 percentage points = −114 basis points. A positive 10-year-minus-two-year spread therefore did not make the whole curve upward-sloping. The maturity pair matters.

    Can Long Yields Rise While the Fed Cuts?

    Yes. Compare the target ranges announced at the September and December 2024 FOMC meetings with Treasury yields on those dates.[9][10][11]

    Historical Example: Policy Target and Treasury Yields Diverged
    Announced policy ranges and historical Treasury par yields
    Measure September 18, 2024 December 18, 2024
    Announced federal funds target range 4.75%–5.00% 4.25%–4.50%
    3-month Treasury yield 4.84% 4.36%
    2-year Treasury yield 3.61% 4.35%
    10-year Treasury yield 3.70% 4.50%
    • Target range: 4.25% − 4.75% = −0.50 percentage point at the lower endpoint; 4.50% − 5.00% = −0.50 percentage point at the upper endpoint. Both were 50 basis points lower.
    • Three-month yield: 4.36% − 4.84% = −0.48 percentage point = −48 basis points.
    • Two-year yield: 4.35% − 3.61% = +0.74 percentage point = +74 basis points.
    • 10-year yield: 4.50% − 3.70% = +0.80 percentage point = +80 basis points.

    The 50-basis-point figure compares the two announced ranges; December’s individual policy cut was 25 basis points. The comparison uses announcements, not observations of the effective federal funds rate.

    The very short Treasury yield fell while the longer yields rose between these dates. This illustrates why today’s policy target cannot determine the rest of the curve. These endpoints alone cannot establish how much of the change came from future policy expectations, inflation, or term premium.

    How to Analyze the Yield Curve

    1. Choose comparable observations. Use the same issuer, currency, yield series, and observation date. Keep nominal Treasury yields separate from inflation-adjusted yields.
    2. Inspect several maturities. Check the middle as well as the endpoints; one spread cannot describe every bend.
    3. Calculate a named spread. Use the same maturity pair and sign convention when comparing dates.
    4. Identify which yields moved. Separate changes in the overall level from changes in the spread.
    5. Investigate the drivers. Compare the move with policy announcements, inflation and growth news, and evidence about bond supply and demand before assigning a cause.
    Explore the Yield Curve Analyzer

    Common Mistakes

    • Treating the Fed’s target as the Treasury yield. An overnight policy target and a market yield over two or 10 years measure different things.
    • Confusing rising yields with steepening. Steepening depends on the change in the long-minus-short spread.
    • Calling the entire curve inverted from one pair. Name the maturities and inspect the other points.
    • Reading a yield change as a coupon change. A fixed-rate bond’s coupon stays fixed as its market price and yield change. Our guide to bond pricing and yield to maturity explains the relationship.[12]
    • Confusing basis points with relative percentages. The historical increase from −38 to +9 basis points is 47 basis points, not a 47% increase.
    • Assigning a single cause to a shape. Expectations, risk premiums, and investor demand can produce similar observed curves.

    Limitations of Yield-Curve Interpretation

    The Curve Does Not Reveal Every Driver

    Expected future policy rates and term premiums are not directly observable. Models and surveys can produce different estimates, so a yield spread alone cannot tell you precisely what investors expect or why yields changed.[13]

    A Treasury curve is also a benchmark rather than a promise about your investment return. A government-backed bond can lose market value before maturity, and longer comparable fixed-rate bonds generally have greater interest-rate risk. A curve point does not guarantee your return over a shorter holding period.[12]

    Finally, historical forecasting relationships can change. Use the curve alongside economic evidence, and keep its observed shape separate from a forecast about recession timing.[8]

    Frequently Asked Questions


    A yield curve compares different maturities on one date. A historical chart of the 10-year yield follows one maturity across different dates. Comparing two yield-curve snapshots lets you see how both the level of yields and their relationship changed.


    The cut changes the current overnight policy target. The 10-year yield reflects expectations over many years and a changing term premium. Revisions to inflation, growth, future policy, or investor demand can outweigh the effect of a lower current target.[5]


    Common comparisons include 10-year minus two-year and 10-year minus three-month Treasury yields. They can give different readings because their short maturities differ. State the pair explicitly; the New York Fed recession-model approach discussed by the St. Louis Fed uses the 10-year-minus-three-month spread.[8]


    No. A curve can be flat, inverted, or downward-sloping in one segment and upward-sloping in another. Expected future short rates and term premiums together determine the relationship. A longer maturity’s greater price risk does not guarantee a higher quoted yield on every date.[5][8]


    No. Historical relationships support watching inversion as a risk indicator, but neither the occurrence nor timing of a recession is guaranteed. Results also depend on the maturity pair, model, and economic conditions. The spread is one input to analysis.[8]

    Sources

    Sources consulted October 20, 2026. Market examples use the specified historical observation dates.

    1. SEC Investor.gov, Yield Curve, glossary definition.
    2. TreasuryDirect, About Treasury Marketable Securities, instrument types.
    3. U.S. Treasury, Treasury Yield Curve Methodology, updated February 18, 2025.
    4. Federal Reserve Board, Monetary Policy: What Are Its Goals? How Does It Work?, updated July 29, 2021.
    5. Ben S. Bernanke, Federal Reserve Board, Long-Term Interest Rates, March 1, 2013, yield components and Treasury demand.
    6. New York Fed Liberty Street Economics, Treasury Term Premia: 1961–Present, May 12, 2014, definition and estimation limits.
    7. Daniel Beltran and Canlin Li, Federal Reserve IFDP 1447, Estimating Yield Impacts of Treasury Demand and Supply Changes, September 2026 (updated September 18, 2026), abstract.
    8. Christopher J. Neely, St. Louis Fed, What Is the Probability of a Recession? The Message from Yield Spreads, September 7, 2023.
    9. U.S. Treasury, Daily Treasury Par Yield Curve Rates, 2024, January 2, September 18, and December 18 rows and explanatory notes.
    10. Federal Reserve Board, September 18, 2024 FOMC Statement, announced target range.
    11. Federal Reserve Board, December 18, 2024 FOMC Statement, announced target range.
    12. SEC Investor.gov, When Interest Rates Go Up, Prices of Fixed-Rate Bonds Fall, June 26, 2013.
    13. Roberto Perli, New York Fed, Disentangling Messages from the Treasury Market, November 16, 2023, unobservable components and estimation limits.
    Disclaimer

    This article is for educational purposes and does not constitute investment advice. Historical yields and policy announcements are dated examples, not current quotes or forecasts. A Treasury yield does not guarantee a return over your chosen holding period.

    Keep reading

    More in Fixed Income