A repurchase agreement, usually shortened to “repo,” is a short-term financing deal in which one party sells securities to another and agrees to buy the same securities back at a slightly higher price on a set future date. The price difference is effectively interest on a very short loan, and the securities act as collateral. Although the trade is legally structured as a sale and a repurchase, economically it is a secured loan, and that is how both sides treat it on their books.
Repos are not a niche product. The U.S. repo market averaged about $12.6 trillion in daily exposures during the third quarter of 2025, making it one of the largest segments of the financial system.1Office of Financial Research. Sizing the U.S. Repo Market They are what keeps cash moving overnight between banks, securities dealers, money market funds, and the Federal Reserve, and they set the benchmark rate that now underlies trillions of dollars in mortgages, student loans, and corporate credit.
How the Transaction Works
A repo begins when a dealer or financial institution (the seller) transfers securities to a counterparty (the buyer) in exchange for cash. At the same moment, both sides agree that the seller will buy those same securities back on a specified date at a price slightly above the original sale amount. That markup is the cost of borrowing the cash. Most trades close within a day or two, though some run for weeks or months.
Because the transfer of ownership is temporary, the seller keeps the economic benefits of the securities. If a Treasury bond pays a coupon while it sits with the buyer, the buyer passes a substitute interest payment back to the seller. The seller also typically continues to carry the securities on its balance sheet as an asset, with the cash received recorded as a liability. Under U.S. accounting standards, most repos are treated as secured borrowings rather than true sales.
Most U.S. repo trades run under the Master Repurchase Agreement (MRA), a standardized contract published by the Securities Industry and Financial Markets Association. The MRA spells out each party’s rights on margin calls, defaults, and collateral substitution so the terms do not have to be renegotiated every time two firms trade.2Securities Industry and Financial Markets Association (SIFMA). MRA and GMRA Documentation
The Repo Rate
The repo rate is the annualized interest rate implied by the gap between the sale price and the higher repurchase price. By convention, it is calculated on a 360-day year, like most U.S. money-market instruments. If a dealer sells $10 million in Treasury notes and buys them back the next day for $10,005,000, the $5,000 gap is the financing cost, and the annualized rate works out to about 18 basis points. The rate moves with cash supply in the banking system, demand for specific securities, and Federal Reserve policy.
Collateral and Haircuts
The securities pledged in a repo are what make the trade attractive to cash lenders. U.S. Treasury bills, notes, and bonds are the most common collateral because they carry essentially no default risk and trade in deep, liquid markets. Agency debt and mortgage-backed securities from government-sponsored enterprises are also widely accepted. Each security carries a unique CUSIP identifier, so both parties know exactly which bonds are pledged at any moment.3DTCC. GCF Collateral Eligibility and Collateral Types Safer collateral earns the borrower a lower rate.
The haircut is the percentage gap between the collateral’s market value and the amount of cash actually lent. If a dealer pledges $1 million in Treasury bonds but receives only $980,000, the 2% difference cushions the lender against a drop in the bonds’ price before the repo matures. Riskier collateral demands a bigger cushion. Equity collateral has historically carried haircuts of 10% to 20% or more, while Treasuries trade with haircuts as low as 2% to 3%.
Collateral values do not freeze once a repo is open. If the market value of the pledged securities falls enough to erode the original cushion, the cash lender can issue a margin call for additional securities or cash. Industry practice calls for cash margin to be delivered the same day the call is made and securities margin within one to two business days. Failing to meet a margin call is a default under the MRA, and it can trigger immediate termination of every outstanding trade between the two parties.
Overnight, Term, and Open Repos
Repos come in three basic maturities. Overnight repos are the most common: the seller delivers securities today and buys them back tomorrow. Because the lender’s cash is at risk for only one business day, overnight repos carry the lowest rates, and banks and dealers rely on them to square up their books at the end of each trading day.
Term repos have a fixed maturity anywhere from a few days to several months. The rate is usually higher than the overnight rate to compensate the lender for locking up cash longer, and both sides are bound to the agreed end date. Open repos have no set maturity. They renew automatically each day, with the rate adjusting to current market conditions, and either side can terminate with short notice. That flexibility suits ongoing funding relationships where cash needs are frequent but hard to predict.
How Repos Settle
Settlement method determines who holds the collateral, how quickly disputes resolve, and how much operational risk each party bears.
In a bilateral delivery-versus-payment (DVP) repo, the seller sends the securities directly to the buyer’s custodian and cash moves simultaneously in the opposite direction. There is no middleman. The buyer takes physical possession of the collateral and handles its own valuation and margin calls. Bilateral DVP offers control but requires each party to have the operational infrastructure to settle, track, and return specific securities.
A tri-party repo inserts a clearing bank between the two sides. In the U.S. market, Bank of New York Mellon serves as the sole tri-party agent, providing custody, settlement, and daily collateral valuation.4New York Fed. Frequently Asked Questions – The Tri-Party Repo Market Infrastructure Task Force About $3.1 trillion of the $12.6 trillion in daily repo exposures in Q3 2025 settled through BNY’s tri-party platform.1Office of Financial Research. Sizing the U.S. Repo Market The agent handles collateral allocation and optimization, freeing both sides from most of the operational work.
General Collateral Finance (GCF) repos add anonymity. Dealers execute GCF trades through brokers on a blind basis, and the Fixed Income Clearing Corporation (FICC) steps in as the central counterparty. Once FICC compares the trade, it guarantees settlement and becomes the legal counterparty to both sides.5DTCC. GCF Repo Service That structure eliminates bilateral credit risk between the original dealers and lets firms net their positions for balance-sheet purposes.
Who Uses Repos
Securities dealers are the most active participants. They use repos to finance their inventories of government bonds and other securities. A dealer that buys $500 million in Treasuries at auction does not need to hold that much cash. It pledges the bonds in a repo, receives cash, and funds the next purchase. This cycle keeps the government bond market liquid.
Commercial banks use repos to manage short-term liquidity. Since the Federal Reserve reduced reserve requirements to zero in March 2020, banks no longer need repos specifically to meet minimum reserve levels, but they still have daily cash imbalances to work out.6Federal Reserve Board. Reserve Requirements A bank with excess cash on a given day can lend it through a repo and earn overnight interest. A bank that needs temporary funding can pledge its Treasury holdings and get cash without selling off long-term investments.
Money market funds are among the largest cash lenders in the repo market. These funds need safe, short-term investments that preserve principal, and repos backed by government securities fit that bill. Hedge funds, by contrast, use repos to build leverage: a fund can pledge securities it already owns to borrow cash, then use that cash to buy more securities, which can themselves be pledged in further repos. The chain amplifies potential returns and multiplies losses in equal measure.
Corporate treasurers and pension funds round out the market. A corporation sitting on excess cash between payroll dates can park that money in an overnight repo backed by Treasuries and earn a small return with minimal risk. Pension funds with long time horizons use reverse repos the same way to earn safe income on idle cash.
The Federal Reserve’s Role
The Federal Reserve is the single most influential participant in the repo market. It uses repos and reverse repos as its primary tools for keeping short-term interest rates within the target range set by the Federal Open Market Committee.
When the Fed wants to add cash to the banking system, it buys securities from primary dealers through repo operations, temporarily increasing bank reserves. When it wants to drain cash, it does the reverse. These open market operations have anchored monetary policy for decades, and the Fed has since added two standing facilities that act as guardrails for overnight rates.
The Standing Repo Facility (SRF), launched in 2021, lets eligible counterparties borrow cash overnight against Treasury, agency, and agency mortgage-backed collateral. The SRF rate is set by the FOMC and serves as a ceiling on overnight money market rates: if market repo rates rise above the SRF rate, dealers can borrow directly from the Fed instead, pulling rates back down.7Federal Reserve Board. Standing Repurchase Agreement Operations As of late 2025 the SRF rate stood at 3.75%.8New York Fed. FAQs – Standing Repurchase Agreement Operations
The Overnight Reverse Repo Facility (ON RRP) works the other way. The Fed sells securities to eligible counterparties (primarily money market funds) and agrees to buy them back the next day, absorbing excess cash from the system. The ON RRP offering rate acts as a floor on money market rates. As of early 2026 that rate was 3.50%.9Federal Reserve Bank of St. Louis (FRED). Overnight Reverse Repurchase Agreements – Offering Rate Together, the SRF ceiling and the ON RRP floor create a corridor that keeps overnight rates where the Fed wants them.
Reverse Repos Explained
A reverse repurchase agreement is the same transaction viewed from the cash lender’s side. The party providing cash and receiving collateral sees a “reverse repo,” while the party receiving cash and pledging securities sees a “repo.” Lend $10 million against Treasury bonds overnight and you are doing a reverse repo; your counterparty is doing a repo. The mechanics, documentation, and legal protections are identical. The only difference is which chair you sit in.
The Fed’s ON RRP facility is the largest single reverse repo program in the world, and its daily usage at times exceeded $2 trillion in 2022 and 2023 when money market funds parked enormous sums there.
Why Repos Reach Your Loan Rate
The Secured Overnight Financing Rate, or SOFR, is calculated directly from repo market data. The New York Fed publishes SOFR each business day as the volume-weighted median of overnight Treasury repo transactions cleared through three channels: BNY Mellon’s tri-party platform, FICC’s GCF Repo service, and FICC’s DVP bilateral service.10New York Fed. Secured Overnight Financing Rate Data Because SOFR is drawn from actual transactions in a deep, liquid market rather than from bank estimates, regulators chose it as the replacement for LIBOR.
That connection matters outside Wall Street. Adjustable-rate mortgages, student loans, corporate credit facilities, and trillions of dollars in derivatives contracts are now benchmarked to SOFR. When repo rates spike, SOFR spikes with them, and borrowing costs across the economy can jump overnight. If you have a SOFR-linked loan, you are a downstream participant in the repo market whether you know it or not.
What Can Go Wrong
Repos provide cheap, flexible funding in normal times, and that funding can vanish in hours when confidence breaks. The collapse of Bear Stearns in March 2008 showed how. The firm funded between $50 billion and $70 billion of its operations through overnight repos. When confidence eroded, lenders tightened terms, demanded more collateral, and eventually stopped lending. By March 13, 2008, executives told the board that $14 billion in repo would not roll over and the firm might not have enough cash to open the next morning.11Financial Crisis Inquiry Commission. FCIC Final Report – Chapter 15 – The Fall of Bear Stearns
A different kind of failure hit on September 17, 2019, when the overnight repo rate shot above 5%, more than doubling from the day before. Two routine events collided: quarterly corporate tax payments drained cash from bank accounts, and $54 billion in newly auctioned Treasury debt settled the same day, forcing dealers to finance a sudden surge of bonds. Bank reserves dropped by roughly $120 billion over two business days, and there simply was not enough cash in the system to fund all the repos at normal rates. The Fed announced a $75 billion overnight repo operation, the first such emergency injection in a decade.12Federal Reserve Board. What Happened in Money Markets in September 2019 The episode directly motivated the Standing Repo Facility two years later.
The everyday risks are smaller but constant. A sudden drop in collateral value between margin calls can leave a lender underprotected. Highly leveraged hedge funds that chain multiple repos together can face cascading margin calls if markets move against them. Haircuts are supposed to absorb these shocks, but haircuts that looked adequate in calm markets proved thin in 2008.
Legal Protections and Fraud Penalties
Repo participants hold an unusual legal shield in bankruptcy. If a counterparty files, the non-defaulting side can immediately liquidate the pledged collateral without waiting for court permission.13Office of the Law Revision Counsel. 11 U.S. Code 559 – Contractual Right to Liquidate, Terminate, or Accelerate a Repurchase Agreement In most bankruptcies, an automatic stay freezes the debtor’s assets until a judge sorts out priorities. Repos are specifically exempted. This “safe harbor” exists because freezing repo collateral could trigger the kind of cascading liquidity crisis that nearly brought down the financial system in 2008.
Fraud in the repo market carries severe federal penalties. Anyone who uses a fraudulent scheme involving a financial institution’s assets or securities faces fines up to $1 million and up to 30 years in federal prison.14Office of the Law Revision Counsel. 18 U.S. Code 1344 – Bank Fraud Those penalties reach any deliberate misrepresentation in a repo trade, from lying about the quality of collateral to fabricating trade confirmations or misappropriating pledged securities.