Repo Trading Desk: How Haircuts, Specials and the Basis Trade Work

A repo trade is a collateralized loan dressed up as a sale and a repurchase, and the arithmetic behind it fits on an index card. The part most interview prep skips is that the standard picture of a haircut, where the borrower always posts more collateral than the cash it gets, only describes part of today's market.

A large share of Treasury repo now trades at a zero haircut, and a real slice trades at a negative one, where the cash lender is the side putting up the extra value.

What follows works both of those in real numbers: a repo trade financed at the market's own general collateral rate, the same arithmetic redone for a security trading special, and the cash futures basis trade that repo desks finance underneath, all dated to the New York Fed's own published data rather than a stale example from a textbook.

What the repo desk actually trades

A repo, short for repurchase agreement, is legally a sale of a security with a promise to buy it back later at an agreed price. Economically it is a cash loan, and the gap between the sale price and the repurchase price is the interest, called the repo rate. Sell nine million dollars of Treasuries today and agree to repurchase them for nine million and ninety thousand a year later, and the implied rate is one percent.

The desk trades that structure against U.S. Treasury securities and agency debt or mortgage-backed securities, in two collateral forms and across a handful of terms. General collateral repo accepts any security within an eligible class, and the specific-issue form, known as a security trading special, names one CUSIP the cash investor actually wants rather than any Treasury that fits.

The forms break down like this:

• General collateral: any eligible Treasury or agency security, priced close to the market's benchmark rate.
• Specific issue, or specials: a single named security, trading below general collateral when it is scarce.
• Overnight and term: most trades roll or mature within a day to a few months.
• Open and evergreen: longer structures either side can unwind with notice, used less often than overnight and term.

Who is on the other side of every trade

Three segments split the Treasury repo market, each with its own clients and its own price. Client-to-dealer trading is dealers borrowing cash mostly from money market funds, the market's cheapest and largest source of cash, priced close to the tri-party general collateral rate. Interdealer trading redistributes liquidity among dealers themselves, entirely through the Fixed Income Clearing Corporation, a DTCC subsidiary, and it is the smallest and most volatile of the three.

Dealer-to-client trading is dealers lending cash to levered accounts, mostly hedge funds, the most expensive segment. Participants use roughly the 75th percentile of SOFR's own transaction distribution as a rough proxy for the rate.

That three-segment split sits on top of an older, simpler participant map that still holds:

• Cash lenders: money market funds, corporate treasuries, insurers, central banks, sovereign accounts.
• Cash borrowers: hedge funds, mortgage REITs, and other broker-dealers financing a position.
• Securities lenders: pension funds, sovereign wealth funds, and insurers lending a specific security for a fee.
• Securities borrowers: hedge funds and dealers covering a short sale or a settlement fail.

A single client rarely sits in only one of these boxes. A hedge fund is a heavy cash borrower on one book and a securities borrower on another, and reading which role is driving a given order is most of what separates a strong repo trader from an average one.

How the desk makes money

The desk's most basic revenue is the intermediation spread between what it pays for cash and what it charges for it: near general collateral on the cheap side, and up near the dealer-to-client rate on the expensive side. That spread is not fixed. It widens specifically on reporting dates, quarter end and fiscal month end, when every dealer is managing its own balance sheet at once and cash gets harder to source.

A second, separate source of economics is specialness. A security in high demand relative to its available supply trades special: its own repo rate sits below general collateral, and the gap is driven by that security's own borrowing demand and lending supply, not by the borrower's credit.

A dealer that owns a security trading special can lend it out below the general collateral rate and still come out ahead, because what it is monetizing is the security itself, not the cash.

The third piece is balance sheet. Post-crisis leverage rules mean every Treasury a dealer holds needs capital behind it, and a bank that receives a haircut from a counterparty is partly using it to offset the haircuts it pays away elsewhere.

Paying a haircut to an unrated non-bank client can carry a capital charge as high as the full value of the haircut, which is exactly why a temporary rule change in 2020, covered below, mattered so directly to how the desk prices a trade.

The market by the numbers

The U.S. repo market averaged about $12.6 trillion in daily exposures in the third quarter of 2025, split across the segments above and a fourth, the Federal Reserve's own overnight reverse repo facility, whose usage rose and then fell back between 2021 and 2024. The daily volume behind SOFR itself, essentially the overnight Treasury general collateral and specials market it is built from, has grown from around $1 trillion in early 2022 to around $3 trillion today.

On September 10, 2026, the New York Fed's own published rates put SOFR at 3.62 percent on $2.92 trillion of volume, the Tri-Party General Collateral Rate at 3.60 percent on $1.17 trillion, and the Broad General Collateral Rate also at 3.60 percent on $1.20 trillion. Twenty-six firms sit on the New York Fed's current primary dealer list, the group required to bid at every Treasury auction.

$12.6tn

average daily repo exposures

Q3 2025

3.62%

SOFR

Sep 10, 2026, on $2.92tn of volume

3.60%

general collateral rate

Sep 10, 2026 (TGCR)

26

primary dealers

current New York Fed list

Tri-party, bilateral and cleared

The U.S. repo market runs on three settlement structures, and a desk uses each one for a different job. In bilateral repo, each side's own custodian handles clearing, the collateral provider typically confirms which security it will deliver earlier in the day, and the cash investor gets full control of the collateral, which puts the settlement risk on the collateral provider if the closing leg fails.

Dealers favor bilateral repo specifically to acquire securities, since it settles earlier and lets the collateral be reused. Tri-party repo runs through a clearing bank, Bank of New York Mellon, which settles the trade on its own books and holds the collateral so it cannot be reused outside that platform.

That removes the closing-leg risk for the collateral provider in exchange for settling later in the day, and it typically trades general collateral rather than a named security, which is why dealers rely on it to fund themselves rather than to source a specific bond.

• Bilateral: each side's own custodian settles; full collateral control, but closing-leg risk falls on the collateral provider.
• Tri-party: a clearing bank settles and holds the collateral; safer, but later in the day and general collateral only.
• Centrally cleared: the clearing corporation stands between both sides; anonymous, and the standard haircut is zero.

A third structure, General Collateral Finance Repo, was introduced by the clearing corporation in 1998 and also settles on the tri-party platform. The clearing corporation itself sits between both sides as counterparty, trades are anonymous through interdealer brokers, and the haircut on a standard trade is zero.

A related service, the clearing corporation's Sponsored Service, lets a bank Sponsoring Member bring a buy-side firm, one that cannot itself be a full clearing member, into centrally cleared repo: the buy-side firm trades, and the bank stands behind it for settlement. That service ran average daily volume of $2.5 trillion in the second quarter of 2026, up from a $2 trillion peak at the end of 2024.

Non-centrally cleared bilateral

$5.0tn

Centrally cleared

$4.4tn

BNY tri-party (excl. cleared)

$3.1tn

A fourth segment, the Fed's own overnight reverse repo facility, is tracked separately.

The trade, worked through

On September 10, 2026, a cash investor lends $50,000,000 overnight against U.S. Treasury general collateral at the Tri-Party General Collateral Rate of 3.60 percent, with a 2 percent haircut, the level tri-party Treasury repo has held consistently for over a decade.

Using the standard definition, a haircut is one minus the ratio of cash lent to collateral value, so the collateral required is $50,000,000 divided by 0.98, which is $51,020,408 in par value of Treasury securities.

Rebuilding the haircut from that number checks out: one minus ($50,000,000 divided by $51,020,408) comes back to exactly 2.00 percent. Interest on an actual over 360 day basis for one overnight day is $50,000,000 times 0.036 times one over 360, which is $5,000.00, and the same figure comes out by taking the daily rate first, 3.60 percent divided by 360, and multiplying by the principal. The collateral provider repurchases the next business day for $50,005,000.00.

Stretch the same trade to a 30-day term at 3.66 percent, the SOFR level on September 1, 2026, and $20,000,000 of principal earns $20,000,000 times 0.0366 times 30 over 360, which is $61,000.00, exactly matching a daily-rate check of $2,033.33 a day for 30 days.

The same trade, on special

Run the identical arithmetic for a security trading special, and the picture most interview prep never draws in numbers appears. Suppose a specific 10-year Treasury note is in high demand to cover short sales, and its own overnight repo rate is 2.60 percent, a full percentage point below the 3.60 percent general collateral rate that day.

Because the cash investor wants that exact security badly enough, it lends $50,500,000 in cash against collateral worth only $50,000,000: a negative haircut of one minus (50,500,000 divided by 50,000,000), or negative 1.00 percent.

Interest on that leg, actual over 360, is $50,500,000 times 0.026 times one over 360, or $3,647.22. The same cash at the general collateral rate would have earned $50,500,000 times 0.036 times one over 360, or $5,050.00.

The gap, $1,402.78 a day, is what the cash investor gives up to obtain the specific security it wants, on top of the extra collateral value it has to put up rather than receive. That is the arithmetic behind "special means a lower rate": the security's owner, not the cash, is what is scarce.

Zero haircut

56%

Positive haircut

34%

Negative haircut

10%

A negative haircut means the cash lender, not the borrower, posts the extra value.

The cash-futures basis, worked through

A related trade sits one step over on the desk's risk map. A fund buys a Treasury security, finances it in term repo, and sells the matching Treasury futures contract, capturing the gap between the cash bond's price and the price the futures market implies.

Suppose a fund buys $100,000,000 face value of a note, plans to hold it 90 days to delivery, and finances it at the New York Fed's own published 90-day SOFR average of 3.65 percent on September 11, 2026. If the futures price implies a repo rate of 4.00 percent over that period, an illustrative figure rather than one this piece can quote from an exchange's own data, the trade captures the gap between the two.

The two routes agree: (0.0400 minus 0.0365) times $100,000,000 times 90 over 360 comes to $87,500, and so does annualizing first, 0.35 percent of $100,000,000 is $350,000 a year, then $350,000 divided by 360 times 90 days.

Regulators watch this trade closely because it is typically repo-financed and highly leveraged, which one Federal Reserve note puts plainly: that combination is what makes it vulnerable to rapid, large unwinds under stress.

Estimates of its size vary sharply by measurement method: a September 2023 filing-based estimate put the net position at $574 billion, a January 2024 trading-data proxy put it at $317 billion, and CFTC data on leveraged funds' short Treasury futures positions the same month showed $991 billion, a reminder that even regulators do not agree on one number for this trade.

CFTC, short futures positions (Jan 2024)

$991bn

Form PF, net repo position (Sep 2023)

$574bn

TRACE based proxy (Jan 2024)

$317bn

Three regulatory data sources, three different estimates of one trade's size.

How it changed: 2008, then 2019 to 2021

On September 17, 2019, SOFR spiked to 5.25 percent, up from 2.43 percent the prior business day, on $1.18 trillion of volume. The Federal Reserve's own research traces the move to a temporary collision of the corporate tax date and a large Treasury settlement, which drained reserves faster than expected and showed that the level of reserves considered ample had been overestimated. The effective federal funds rate moved above its target range the same day.

March 2020 brought the same underlying stress at far larger scale. On March 12, the New York Fed announced $500 billion three-month repo operations twice in two days, weekly $500 billion term operations after that, daily overnight repo of at least $175 billion, and twice-weekly term repo of at least $45 billion, explicitly to address disruption in Treasury financing markets tied to the coronavirus outbreak.

Three weeks later, on April 1, 2020, the Federal Reserve Board temporarily excluded Treasury securities and reserves from the Supplementary Leverage Ratio for bank holding companies, cutting aggregate Tier 1 capital requirements by about 2 percent. That is precisely the balance-sheet cost described above that otherwise makes it expensive for a dealer to hold Treasuries and intermediate repo.

The Treasury clearing mandate

Treasury cash and repo transactions face a new central clearing requirement. Adopted on December 13, 2023, the rule originally required compliance by December 31, 2025 for eligible cash-market transactions and June 30, 2026 for eligible repo transactions.

On March 4, 2025, regulators extended both dates by one year, to December 31, 2026 for cash and June 30, 2027 for repo, after trade associations argued the original timeline left too little time to build the documentation and onboarding a shift to central clearing requires.

The clearing corporation is the one entity this mandate currently routes through: it is the covered clearing agency named in the rule text, and it filed its own proposed rule changes to implement the trade submission requirement in June 2024, which went through several rounds of regulatory review into 2025.

Who the dealers are

The New York Fed's primary dealer list ran to 26 firms in 2026, the group obligated to bid at every Treasury auction and stand ready to trade with the Fed's own desk. Ten of them are the dealer banks named most often on this site, each running a repo and financing business inside a broader markets division:

Bank of New York Mellon carries a second role beyond its own trading book: it is the sole clearing bank operating the entire U.S. tri-party repo settlement platform, a structural fact about the plumbing rather than a claim about market share. J.P. Morgan Chase ran that role alongside it until exiting the tri-party clearing business in 2018, and remains a primary dealer in this market, a different thing.

The other sixteen primary dealers, from regional and Canadian banks to specialist bond dealers, sit outside what this site otherwise covers.

A junior's day on the desk

Repo trading runs slower and steadier than most other trading desks, and a junior's day follows the market's own rhythm rather than a constant stream of activity. Practitioners and training providers describe core responsibilities centered on market making, providing liquidity, funding the firm's own securities inventory, and managing the risk and liquidity of collateral received.

That description has a junior tracking how much is borrowed against what collateral as rates, client needs, and macro conditions shift through the day, with most trades now executing electronically rather than by voice, which shifts time toward managing that execution rather than manually working single tickets.

The one part of the day that is not steady is the calendar itself. Reporting dates, quarter end and fiscal month end, are when dealers actively manage balance sheets and the spreads described above widen, and a junior on the desk learns to see those dates coming well before the rate itself moves.

What the interview actually tests

A strong repo interview answer starts with the mechanics stated cleanly: the collateralized-loan structure, general collateral against specials, and why tri-party, bilateral and cleared settlement each suit a different job. From there, a candidate should be able to explain what a haircut protects against and why the textbook positive haircut is no longer the whole story.

Beyond that, walk through how SOFR itself is built from tri-party and specific-issue repo data, and describe the cash futures basis trade and why regulators track it. Bond math is tested on its own, and curve trades belong to the desk that trades them; a repo candidate needs a working grasp of both rather than a deep one.

The arithmetic above, redone on a different notional or a different haircut, is a better rehearsal than memorizing the answers. A bond calculator is useful for the curve side of the desk, and a broader interview readiness check covers the fit and market-view material every desk interview shares.

Where repo traders go next

Career guides describe three common paths out of a bank repo seat. The clearest is another dealer's repo or short-end rates desk, since repo is the financing leg underneath most rates positions.

The most common outside move is to a relative value hedge fund, since those funds lever up through the same repo market a bank desk trades every day and specifically value someone who already understands its plumbing. A smaller number move into public sector roles, most often cited as the Federal Reserve or the Treasury.

• Another dealer's repo or short-end rates desk, at a more senior level.
• A relative value hedge fund, where repo financing is the core of the strategy.
• A public sector role at the Federal Reserve or the Treasury.

That skews narrower than the exits open to a rates or credit seat, where a macro hedge fund or an asset manager is just as common a landing spot. Hedge fund gross Treasury exposure, heavily built on repo-financed positions, roughly doubled between 2018 and February 2020 to $2.4 trillion, driven mainly by relative value strategies like the basis trade above, which is exactly the skill set a repo trader already has.

How to prepare

• Be able to state the repo-as-collateralized-loan mechanic in one sentence, then work the arithmetic above from scratch.
• Practice the haircut and collateral calculation at a different notional, a different rate, and a different haircut.
• Know the difference between general collateral and a special, and why a special repo rate sits below general collateral.
• Have a plain answer for why SOFR trims out the cheapest fifth of specific-issue repo volume each day when it is built.
• Read the New York Fed's own published SOFR and general collateral rates the morning of the interview, not a remembered number from a study guide.

The bottom line

A repo desk lends and borrows against the safest collateral in the market, and its two hardest ideas, the haircut and the special, are both arithmetic a candidate can rebuild on paper in under a minute.

The market has moved past the textbook case where a haircut always protects the cash lender: zero and negative haircuts are common now, not exceptions, and a strong answer says so plainly rather than repeating the older convention as if it still described the whole market.