Curve Flatteners
Curve Flatteners
When the yield curve has become unusually steep, a flattener trade is a bet that longer bonds will underperform shorter ones as spreads compress.
Key takeaways
- A curve flattener profits when the gap between long and short yields narrows (the curve flattens)
- Constructed by shorting the long end (e.g., 10-year) and going long the short end (e.g., 2-year)
- Flatteners are attractive when the curve is unusually steep and mean-reversion is expected
- The position is the inverse of a steepener but with similar risk-management principles
- Flatteners work best during periods of economic strength or surprising inflation
The Position Structure
A flattener is the opposite of a steepener. The structure is:
Short 10-year Treasury (or longer maturity)
Long 2-year Treasury (or shorter maturity)
This can be implemented via:
- Direct bonds: Short $10 million notional of 10-year Treasuries, buy $10 million of 2-years.
- Futures: Sell 10-year Treasury futures, buy 2-year futures.
- Swaps: Go short 10-year swap rates, long 2-year swap rates.
The goal is for the 10-year to underperform (yield to rise more) relative to the 2-year as the curve flattens.
Why a Flattener Is Attractive
A flattener is most attractive when the curve is unusually steep. A steep curve (150+ bps between 2-year and 10-year) is historically the exception, not the rule. Mean-reversion logic suggests steep curves tend to flatten.
Historical context: In 2021, as the Fed kept rates at zero and inflation began to surge, the 2-10 spread widened to 160+ bps (an unusually steep curve given that the Fed was still in a near-zero environment). By late 2021, as inflation expectations rose and the Fed signaled tightening ahead, a trader might have put on a flattener: shorting the 10-year and buying the 2-year, betting the curve would flatten as rates rose across the board but short-end rose faster.
Indeed, through 2022, the curve flattened dramatically, with the 2-10 spread collapsing from +150 bps to -100 bps by late 2022. A flattener initiated in mid-to-late 2021 would have been enormously profitable.
Profit and Loss Mechanics
To illustrate, suppose a trader puts on a flattener:
Day 1: 2-10 spread is +100 bps (2-year at 1.5%, 10-year at 2.5%).
- Short $1 million 10-year at 2.5%.
- Long $1 million 2-year at 1.5%.
- Net position: benefits if spread narrows (10-year yield rises relative to 2-year).
Day 2: Market reprices. 2-10 spread narrows to +50 bps (2-year at 2.0%, 10-year at 2.5%).
- Short 10-year: no change in yield, no PnL (yet).
- Long 2-year: yield rose from 1.5% to 2.0%, price fell. Loss on the long leg.
- Net PnL: Loss if only the 2-year moved and the 10-year stayed flat.
Better scenario on Day 2: All yields rise, but short end rises more (spreads narrow). 2-year at 2.0%, 10-year at 2.6%.
- Short 10-year: yield rose only 0.1%, price decline is minimal.
- Long 2-year: yield rose 0.5%, but you're long, so you lose.
- Net PnL: Depends on the duration trade-off. The short 10-year loses less (since duration loss is less) than the long 2-year, so net gain.
Alternative scenario on Day 2: Curve inverts (the intended scenario). 2-10 spread is 0 bps or negative (2-year at 2.3%, 10-year at 2.3%).
- Short 10-year: profit! Yield rose from 2.5% to 2.3%... wait, that's a decline. Actually, if the 10-year yield falls, the bond price rises, and the short loses.
Let me reconsider: a flattener profits when the curve flattens, meaning the long end's yield rises relative to the short end. This happens when:
- The 10-year yields rise more than the 2-year (both rise, but 10-year rises more), OR
- The 2-year yields fall while the 10-year stays flat or rises.
In the inversion scenario: 2-10 spread goes from +100 bps to 0 bps. The 10-year yield needs to rise relative to the 2-year for this to happen. If 2-year stays at 1.5% and 10-year rises to 2.5%, that does not flatten. Instead, if both rise but the 10-year rises more, the spread narrows.
Example: Day 1 is 2% / 2.5% (+50 bps spread). Day 2 is 2% / 2.0% (0 bps, inverted). For this to happen, the 10-year fell from 2.5% to 2.0%. A short 10-year position profits when the price rises (yield falls), so this would profit. But a long 2-year position would break even (2-year yield unchanged), so the net is a gain on the flattener.
Actually, let me reconsider the mechanics more carefully. A curve flattens when the long end yields more relative to the short end, not when it yields less.
Correction: A flattener shorts the long end and longs the short end. It profits when the long end underperforms (yields rise relative to short), which is exactly when the curve flattens. The dynamics are:
-
When the curve flattens from steep to normal: 2-10 spread narrows from +150 to +80. The 10-year yield rises more than the 2-year (or the 10-year stays flat while the 2-year falls). Either way, the short 10-year position profits (yield up, price down, short makes money), and the long 2-year is less harmed or profits.
-
When the curve flattens to inversion: 2-10 goes from +50 to -50. The 10-year yield must rise relative to 2-year (or fall less). The short 10-year profits.
When Flatteners Work
Flatteners have worked best in these scenarios:
1. Fed tightening with weak long-end demand: In 2022, as the Fed hiked aggressively, the 2-year yield rose much faster than the 10-year. A flattener (short 10, long 2) would have profited as the curve inverted. Traders who put on flatteners in mid-2021 (when the curve was very steep at +160 bps) made significant gains through 2022.
2. Inflation surprise: If inflation re-accelerates (unexpected oil spike, supply shock), both yields rise, but the 2-year (reflecting Fed policy response) often rises faster than the 10-year (reflecting expected long-term rate path). Flatteners can profit in this environment.
3. Strong economic data: If the economy accelerates unexpectedly (better-than-expected jobs report, strong corporate earnings), the Fed might maintain higher rates for longer, keeping short-end yields elevated while long-end yields reflect long-term growth expectations. The curve might flatten.
4. Term premium collapse: If the long-end term premium (extra yield for duration risk) suddenly compresses (perhaps due to Fed QE, or a flight to safety), the 10-year yield might fall while the 2-year stays high, flattening the curve and hurting flatteners.
When Flatteners Blow Up
Flatteners can lose money when:
1. Recession fears and flight to safety: If economic weakness emerges, investors flee to long-term Treasuries, pushing 10-year yields down sharply. A short 10-year position loses money (yields down, prices up, short loses). The long 2-year might hold up, but the asymmetry causes a loss.
2. Deflation or disinflationary shock: Unexpected deflation (like the 2008 crisis) causes all yields to fall, but the long end falls faster (longer duration). A short 10-year loses a lot. A long 2-year loses less. Net loss.
3. Fed cuts rates faster than expected: If the Fed, facing recession, cuts rates sharply and quickly, the 2-year can fall just as fast as the 10-year (or faster), flattening the curve without the 10-year rising relative to the 2-year. The flattener fails to profit, and if long yields fall at all, it loses.
4. Curve steepening reversal: After a flattener is put on, if economic conditions improve and the curve re-steepens (long end rises relative to short), the position loses.
The 2023–2024 period highlighted this risk. Flatteners put on in 2021–2022 (when the curve was near inversion) worked spectacularly. But flatteners put on in 2023 (expecting the curve to remain flat or invert) suffered losses as the curve started to re-steepen and long-term rates stabilized or fell as growth moderated.
Duration-Neutral Flatteners
Like steepeners, a naive flattener (short $1M 10-year, long $1M 2-year) is not duration-neutral; it is net short duration (short the long bond, long the short bond).
A duration-neutral flattener requires:
- Short $2 million 10-year (9 years duration × $2M = $18M duration).
- Long $9 million 2-year (2 years × $9M = $18M duration).
This way, the position is hedged against parallel yield shifts but profits if the curve flattens.
However, some traders prefer to be modestly short duration (bearish on yields) while also being long the flattener trade. This requires explicit decision-making about how much directional risk to take.
Comparing Flatteners and Steepeners
| Aspect | Steepener | Flattener |
|---|---|---|
| Position | Long long-end, short short-end | Short long-end, long short-end |
| Best after | Inversion, flat curve | Steep curve |
| Profits from | Curve re-steepening | Curve flattening |
| Macro bet | Weak growth, recession coming | Strong growth, tightening surprise |
| Downside | All yields rise, curve flattens | Recession fears, yields fall, curve steepens |
Neither is "better"; they are tools for different market conditions.
Risk Management for Flatteners
- Entry condition: Put on the flattener when the curve is steep (100+ bps spread typical), not when already flat.
- Position sizing: Size such that losses on a "bad case" (recession fears spike, long end rallies hard) are manageable.
- Stop loss: Set a stop if the curve steepens more than expected, or if the 10-year rallies (yield falls) sharply.
- Time horizon: Give the trade 6–12 months to work. If the curve steepens instead of flattens, close the trade before losses compound.
- Monitoring: Track Fed guidance, inflation data, and economic surprises. If growth starts to weaken, close the flattener early because a steepening (not flattening) will likely follow.
Real-World Example
In July 2021, with the 2-10 spread at +160 bps (unusually steep for a post-recovery environment with the Fed still at zero), a trader might have initiated:
- Short $10M notional 10-year Treasury yielding 1.3%.
- Long $45M notional 2-year Treasury yielding 0.2%, sized for duration neutrality.
Outcome through mid-2022: The 2-10 spread collapsed from +160 to -50 bps. The position made approximately 210 bps of profit on the 2-10 spread. The long 2-year also benefited from rising yields (lower prices, long profits) versus the short 10-year rising less in yield.
Why it worked: The steepness was unsustainable given inflation rising and the Fed signaling tightening. The trade was aligned with the consensus that the curve would normalize by flattening.
Flatteners in Different Economic Scenarios
Scenario: Stagflation (inflation + weak growth)
- Flattener: Risky. The Fed might cut rates (pushing curve steep), but inflation keeps long-end yields high. Flatteners might work, but with high volatility.
Scenario: Strong growth + tightening
- Flattener: Likely profits. Short-end yields rise more than long-end as the Fed hikes. Curve flattens.
Scenario: Recession
- Flattener: Likely loses. Investors flee to long bonds, pushing 10-year yields down. Curve steepens.
Scenario: Stable growth + stable inflation
- Flattener: Likely breaks even or small gains. Curve shape is determined by term premium and carry, both of which change slowly.
Implementation Considerations
Flatteners are typically implemented using:
- Outright short selling: Illegal or restricted for individuals in many jurisdictions, so professionals use Treasury futures, which allow short selling.
- Futures spreads: Sell 10-year futures, buy 2-year futures. Easy to unwind, very liquid.
- Swaptions: Buy payer swaptions (right to pay fixed on 10-year) and seller swaptions (right to receive fixed on 2-year) to create a flattening option position.
For retail investors, the easiest approach is to buy short-duration bonds and avoid longer-duration bonds (a less direct flattener equivalent).
Next
Steepeners and flatteners are two-leg curve trades that profit from curve slope changes. A more sophisticated trade is the butterfly, which uses three legs to profit from changes in curve curvature while hedging directional risk. The next article examines this complex but powerful strategy.