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Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →A Treasury cash-futures basis trade is primarily a bet on the relationship between a bond and a related futures contract—not a simple bet that Treasury prices will rise or fall. In the usual long-basis position, a trader buys a deliverable Treasury and sells the futures contract, often financing the bond in repo. The pairing can offset much of the common interest-rate move, but it does not eliminate basis, funding, margin, delivery, or liquidity risk.
What the Treasury cash-futures basis trade is
The typical long-basis position pairs two exposures: a Treasury security eligible for delivery into a futures contract, and a short position in that related futures contract. The trader buys the cash bond, commonly borrowing against it through a repurchase agreement, or repo, and sells futures. The CFTC Market Risk Advisory Committee describes this as “buying the basis.”
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The trade seeks to earn from a change in the relative pricing of the bond and futures contract as their relationship converges toward delivery. A futures contract may be comparatively expensive relative to an eligible cash bond; the trader buys the relatively cheaper bond and sells the relatively richer futures. The relevant result is not the gross spread alone: realized profit or loss also reflects carry, repo financing, margin costs, transaction costs, and delivery economics.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThere is also a reverse position, sometimes called “selling the basis”: short the cash Treasury, buy futures, and use reverse repo to source securities or lend cash. That is a different relative-value position, not the usual long-basis construction.
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Basis trade versus outright directional trade
An outright position aims to profit from the direction of Treasury prices or yields. For example, a long Treasury position generally benefits when its price rises; a futures position can express a view on a price rise or fall. A basis position instead targets the relative value between paired cash and futures exposures. The comparison below describes the usual long-basis trade, not every strategy that might be called a basis trade.
| Question | Long cash-futures basis | Outright directional position |
|---|---|---|
| Return objective | Profit if the cash-futures relationship moves favorably toward convergence, after financing, carrying, trading, and delivery costs. | Profit if Treasury prices or yields move in the intended direction. |
| Typical legs | Buy a deliverable cash Treasury; sell related Treasury futures. The hedge ratio depends on the bond, futures contract, and delivery economics. | Take a long or short position in a bond or futures contract, sized for the intended market exposure. |
| Interest-rate sensitivity | The paired legs can offset much of a common rate move, but need not be perfectly neutral; the hedge can change with market conditions. | Directionally exposed to the market move the position was designed to capture. |
| Relative-value and delivery exposure | Exposed to basis widening or narrowing, changes in the cheapest-to-deliver bond, conversion factors, and delivery options. | Not inherently a cash-futures convergence position; a futures position still has the contract’s delivery and pricing characteristics. |
| Financing and margin | Often depends on repo financing for the bond as well as futures initial and variation margin. | Depends on the instrument and how the position is held; futures also require margin. |
| Stress exit risk | A spread move, more difficult financing, margin demands, or poor market liquidity may force an exit before convergence. | A loss or funding need can also require an exit; the trade’s intended directional exposure is the main market risk. |
“Arbitrage” does not mean guaranteed profit. A basis can widen before it narrows, convergence may take longer than the trader can finance the position, and losses marked on the futures leg can create an immediate cash demand even if the trader still expects the relationship eventually to converge.
Why delivery makes the comparison more complex
Treasury futures are generally physically delivered from a basket of eligible securities. The short futures holder selects which eligible bond to deliver and can choose delivery timing within the delivery period. The bond that is economically cheapest for the short to deliver under prevailing prices, conversion factors, financing rates, and delivery options is called the cheapest-to-deliver, or CTD, security.
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The CTD is not necessarily fixed. Yield levels, yield-curve shape, volatility, and repo rates can change which bond is cheapest. Conversion factors normalize eligible bonds with different coupons and durations for delivery into a standardized contract; delivery timing and quality options also affect fair futures value. If the CTD changes, the appropriate hedge and the basis calculation can change with it.
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That is why a simple cash price minus futures price is not a complete measure of the opportunity. The Federal Reserve Board’s March 2024 analysis of option-adjusted basis net of carry accounts for the futures conversion factor and price, accrued interest, estimated embedded option value, the CTD security’s full price, bond-specific term repo, and the holding period through optimal delivery. More generally, the CFTC defines basis risk as the risk that the basis changes unexpectedly between entering and exiting a hedge.
How repo, leverage, and margin can turn a small spread into a large risk
Repo is a loan secured by Treasury collateral. The cash borrower pays repo interest, may have to provide a haircut—collateral in excess of the cash borrowed—and often needs to renew short-term funding. Futures clearing separately requires initial margin and daily variation margin. Repo rates can change, financing can become harder to renew, and margin needs can rise as prices or volatility change.
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The expected spread is relatively small compared with the size of the position, so traders may use leverage to make the return meaningful relative to the capital committed. That leverage magnifies losses and liquidity needs as well as gains. The CFTC report discusses studies that assume leverage around 20 times; that is an assumption used in those studies, not a universal measured leverage ratio for every participant.
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- The basis moves against the position. Cash and futures can move together overall while their relative spread widens, producing a mark-to-market loss before any eventual convergence.
- Repo becomes more expensive or cannot be rolled over. A funding problem can make a position uneconomic or impossible to maintain.
- Haircuts rise or dealer capacity tightens. The trader may need to post more cash or find less financing even if the Treasury collateral remains valuable.
- Futures variation margin comes due. A losing futures mark can demand cash immediately, creating a liquidity problem distinct from the trade’s eventual expected return.
- The CTD or delivery economics change. The hedge may no longer match the bond exposure as expected, and the basis can respond to changed delivery incentives.
- Several traders sell at once. If leveraged positions are cut together, cash Treasury sales can add pressure to market liquidity.
A 2025 Federal Reserve Bank of Dallas analysis concluded that the trade’s stability is considerably more sensitive to declines in intermediation capacity than to funding-rate increases. In practical terms, access to dealers and repo intermediation matters alongside the level of financing rates.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the trade does for markets—and what it can add to stress
In normal conditions, basis trading can help align futures prices with the deliverable Treasury securities and provide demand for bonds. Futures demand from institutional users, including asset managers managing duration, is part of the market structure in which relative-value traders may take the other side and hedge with cash Treasuries. Federal Reserve and CFTC analysis also identifies the connected exposures among cash Treasuries, repo, and futures as a potential financial-stability vulnerability when leverage is high.
In discussing March 2020, the CFTC advisory report says some studies found that basis-trade sales amplified Treasury-market stress but did not cause it. Broad “dash for cash” selling and other factors also contributed. The Federal Reserve’s 2026 analysis likewise describes rapid unwinding as one contributor to stress; the evidence does not support saying that the basis trade alone caused the episode.
How large is the trade?
In a June 22, 2026 note, Board of Governors of the Federal Reserve System staff estimated aggregate Treasury basis-trade volume at approximately $830 billion in September 2025. The same note estimated that hedge-fund basis positions represented 3.5 percent of privately held Treasury securities outstanding by market value that month, compared with a prior peak of 2.5 percent in early 2020. These are estimates, not a direct census of individual trades: the note uses SEC Form PF and other data, and hedge funds do not report trade-level positioning on Form PF.
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A separate Federal Reserve Board note published in March 2024 estimated at least $317 billion in Treasury holdings related to basis trades accumulated by hedge funds since the first quarter of 2022. That figure covers a different period and estimation approach, so it should not be treated as directly comparable to the later September 2025 estimate. Nor should leveraged-fund short positions in futures alone be read as an exact measure of basis trades, because they can also reflect directional positions or other hedging activity.
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What to examine before calling a position a basis trade
- Objective: Is the intended return from a view on rates, or from a change in cash-futures relative value?
- Pairing and hedge: Which cash bond and futures contract are involved, and how is the hedge sized?
- Delivery: Which bond is currently CTD, and how could changes in the basket, conversion factors, or delivery options affect the position?
- Carry and funding: What are the expected repo, margin, transaction, and delivery costs over the holding period?
- Liquidity under stress: What happens if the spread widens, repo is harder to roll, margin requirements rise, or the trader must sell before convergence?
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