A repurchase agreement, commonly called a repo, is a short-term transaction in which one party sells securities to another and commits to buy them back at a slightly higher price on a set future date. The price difference is, in economic substance, interest on a collateralized loan. The U.S. market for repurchase agreements reached roughly $12 trillion in gross size as of 2024, making it one of the largest segments of the global financial system.1Federal Reserve Board. The $12 Trillion U.S. Repo Market Repos let institutions raise cash without permanently parting with their portfolios, and they let cash-rich institutions earn a return backed by high-quality collateral.
The Two Legs of a Repo
Every repo has two legs. In the first, the seller delivers securities to the buyer and receives cash. In the second, the seller pays back the cash plus a premium and gets the same securities returned. That premium is the borrowing cost. Legal title to the securities passes to the buyer during the trade, but the economic exposure stays with the seller, who has already locked in the price at which the securities come back.2International Capital Market Association. Frequently Asked Questions on Repo – What Is a Repo
The same trade viewed from the cash provider’s side is called a reverse repo. The buyer hands over cash, receives securities as collateral, and earns a return when the seller repurchases at the higher price. So the label depends entirely on which side of the trade you sit on. When the Federal Reserve announces a “reverse repo operation,” it means the Fed is selling securities and pulling cash out of the market.3Federal Reserve Bank of New York. FAQs: Reverse Repurchase Agreement Operations
Because the buyer holds legal title while the repo is open, the buyer can generally re-use or re-pledge the securities to a third party if the collateral is liquid enough. That right adds flexibility for the cash provider. It also means the seller ultimately relies on the buyer being able to deliver the same securities back at maturity.2International Capital Market Association. Frequently Asked Questions on Repo – What Is a Repo
Haircuts
The cash advanced in a repo is almost always less than the market value of the collateral. The gap is called a haircut. If a seller posts $1,000,000 of Treasury bonds, the buyer might advance $980,000, a 2% haircut. That $20,000 cushion protects the cash provider: if the collateral loses value before the repo matures, the lender still holds enough securities to cover its exposure.
Haircuts are negotiated up front. They depend on the type of collateral, its price volatility, and the creditworthiness of the counterparty. U.S. Treasuries carry the smallest haircuts because their prices are stable and credit risk is minimal. Lower-rated bonds or less liquid securities require larger haircuts to offset the greater chance of a price swing during the trade.
Overnight, Term, and Open Repos
Repos fall into three categories based on when the second leg settles.
- Overnight repo. The most common type. The seller repurchases the securities the next business day. Dealers use overnight repos to fund inventory on a rolling daily basis.3Federal Reserve Bank of New York. FAQs: Reverse Repurchase Agreement Operations
- Term repo. Any repo with a fixed maturity beyond one business day, ranging from a few days to several months. Term repos lock in a rate, which reduces rollover uncertainty but introduces interest rate risk if market rates move during the term.
- Open repo. No fixed maturity date. The transaction rolls over automatically until either party terminates it, typically with one day’s notice. Open repos combine the flexibility of overnight funding with less administrative work, since the parties don’t book a new trade each morning.4International Capital Market Association. Frequently Asked Questions on Repo – What Is an Open Repo
The choice depends on how certain the borrower is about when the cash needs to come back. An institution bridging a two-day settlement gap picks a term repo. A money market fund parking excess cash with no fixed horizon prefers overnight or open.
What Counts as Collateral
Not every security works. The collateral must be liquid, easy to price, and quick to sell if the borrower defaults. That narrows the field significantly.
U.S. Treasuries are the most widely used collateral in the American market, accounting for roughly two-thirds of outstanding volume.5International Capital Market Association. Frequently Asked Questions on Repo – Collateral Types Agency debt and agency mortgage-backed securities issued by government-sponsored enterprises make up much of the remainder.6Office of Financial Research. OFR Short-term Funding Monitor – Primary Dealer Repos By Collateral Type Investment-grade corporate bonds also serve as collateral, though they command larger haircuts than government-backed securities because of their higher credit and liquidity risk.
Collateral Substitution
A seller sometimes needs to pull out the original collateral mid-trade and swap in a different security. This is called collateral substitution, and it requires the buyer’s consent. In the U.S. cleared market, the Fixed Income Clearing Corporation handles the mechanics: the seller files a substitution notice, specifies the replacement security, and FICC generates settlement instructions to swap old collateral for new.7DTCC. Repo Collateral Substitution Late submissions incur fees, and requests filed after 1:00 p.m. ET are not processed until the next business day.
Coupons Paid During the Trade
When a bond pays a coupon while it’s sitting as repo collateral, the buyer technically receives the payment because they hold legal title. Standard repo agreements require the buyer to pass that payment straight through to the seller, since the seller still bears the economic risk of the collateral. Under the Global Master Repurchase Agreement, these pass-through amounts are called manufactured payments.8International Capital Market Association. Frequently Asked Questions on Repo – Coupon and Dividend Payments on Collateral
How the Repo Rate Is Calculated
The repo rate is the annualized interest rate implied by the gap between the sale price and the repurchase price. Say a dealer sells $10,000,000 in Treasuries today and agrees to buy them back tomorrow for $10,001,458. Annualized over a 360-day year, that $1,458 works out to roughly 5.25%. U.S. dollar repos use an actual/360 day-count convention: the annual rate is divided by 360 and multiplied by the actual number of days the repo is outstanding.
The formula: Interest = Principal × Rate × (Days / 360). For a seven-day term repo at 4.50% on $50,000,000, the interest is $50,000,000 × 0.045 × (7/360) = $43,750.
General Collateral Versus Specials
Most repo activity is general collateral, or GC, trading. The cash lender doesn’t care which specific security arrives as long as it fits an agreed asset class, such as U.S. Treasuries. The GC rate reflects the cost of borrowing cash and is driven by the supply and demand for funds, not any particular bond.9International Capital Market Association. Frequently Asked Questions on Repo – What Is General Collateral
When demand for a specific bond runs high enough, it trades “on special.” Cash lenders accept a below-market return just to get their hands on that bond. The repo rate on a special can drop well below the GC rate and, in extreme cases, approach zero. Anyone short that particular bond or needing it for settlement is effectively paying a premium to borrow it through the below-market lending rate.
SOFR
The Secured Overnight Financing Rate is calculated directly from repo transactions. It’s a volume-weighted median of overnight Treasury repo trades across three segments: tri-party repos cleared through the Bank of New York Mellon, GCF Repo transactions, and bilateral Treasury repos cleared through FICC’s delivery-versus-payment service. The calculation filters out specials so it captures the general cost of overnight secured borrowing.10Federal Reserve Bank of New York. Secured Overnight Financing Rate Data
SOFR replaced LIBOR as the dominant U.S. dollar reference rate. It now underpins trillions of dollars in floating-rate loans, derivatives, and adjustable-rate mortgages. Because SOFR is built from actual repo trades, disruptions in the repo market can ripple straight into borrowing costs across the broader economy.
Tri-Party and Bilateral Settlement
Repos settle through two main structures, and the difference affects operational cost, collateral flexibility, and risk exposure.
Tri-Party
In a tri-party repo, a clearing bank sits between the two parties and handles collateral selection, valuation, and settlement. The clearing bank acts as an agent providing back-office support to both sides.11Federal Reserve Bank of New York. Tri-Party Repo Infrastructure Reform These trades typically involve general collateral, where the cash lender accepts any securities within a defined asset class rather than naming specific bonds. Tri-party repos settle later in the day and benefit from automated collateral substitution and three-way trade matching.12Federal Reserve Bank of New York. Reference Guide to U.S. Repo and Securities Lending Markets Securities posted in a tri-party repo cannot be re-pledged outside the platform. They stay in the clearing bank’s custody, which protects the collateral provider if there’s a settlement failure on the closing leg.
Bilateral
In a bilateral repo, the two counterparties handle settlement directly through their own custodian banks. These trades require the parties to name specific securities at the CUSIP level when the trade is executed, rather than accepting a broad collateral basket. Settlement usually happens earlier in the day, but at higher operational cost.12Federal Reserve Bank of New York. Reference Guide to U.S. Repo and Securities Lending Markets The cash investor gets full control over the collateral, including the ability to re-pledge it. That flexibility is valuable, but the collateral provider bears the risk that the cash investor might struggle to return the exact securities at maturity.
Who Uses the Repo Market
The repo market draws institutions from both sides of the cash equation. On the borrowing side, securities dealers and commercial banks use repos to finance bond inventories and meet daily reserve requirements. Hedge funds borrow through repos to obtain leverage for trading strategies. On the lending side, money market funds, pension funds, and insurance companies place excess cash into repos to earn a return backed by collateral. Central banks operate on both sides. The Federal Reserve uses repos to inject cash and reverse repos to absorb it, steering overnight interest rates within its target range through the Standing Repo Facility on one side and the overnight reverse repo facility on the other.13Federal Reserve Bank of New York. FAQs: Standing Repurchase Agreement Operations14Federal Reserve Bank of New York. Reverse Repo Operations
A note on terminology. The party providing securities in exchange for cash is the borrower, sometimes called the seller. The party providing cash is the lender, or buyer. The language can trip people up because “seller” sounds like the person parting with an asset, when economically they’re taking out a short-term loan.
Margin Calls and Default
A repo isn’t risk-free just because it’s collateralized. Collateral values fluctuate, and if they drop significantly, the cash lender is suddenly under-secured. Repo agreements handle this through margin calls and, in worst-case scenarios, close-out netting.
Margin Calls
Both parties calculate their net exposure at least once per business day by marking every outstanding repo to market. If the collateral’s current value has fallen far enough that the lender’s exposure exceeds an agreed threshold, the lender issues a margin call. The borrower then posts additional securities or cash to eliminate the shortfall. Many participants agree on a minimum threshold below which they won’t call margin on each other, cutting administrative friction on small moves.
Default and Close-Out Netting
Under the Global Master Repurchase Agreement, events of default include insolvency, failure to pay, failure to meet margin calls, and materially incorrect representations. Once a default is triggered, close-out netting unfolds in three stages.15International Capital Market Association. Frequently Asked Questions on Repo – What Happens to Repo in a Default
- Acceleration. All repos under the same master agreement become immediately due. Any outstanding margin is called back.
- Valuation. The non-defaulting party determines the market value of all collateral, including transaction costs and the cost of replacing hedges or defaulted trades.
- Netting. All obligations are converted into a single currency and netted to produce one residual amount. Whoever owes the net balance must pay by the next business day.
The non-defaulting party controls valuation. It can use actual sale prices, market quotes from two or more dealers, or a combination. If the collateral is too illiquid to sell or quote, the non-defaulting party may estimate fair value using pricing models based on comparable securities.
Accounting and Tax Treatment
Under U.S. accounting rules, most repos are recorded as secured borrowings rather than sales. The seller maintains effective control because it has both the right and the obligation to repurchase the same securities before maturity.16Financial Accounting Standards Board. Accounting Standards Update No. 2014-11 So the securities stay on the seller’s balance sheet, a cash liability appears, and the repurchase premium is recorded as interest expense over the life of the trade. The buyer records the cash outflow as a receivable rather than a securities purchase.
For a repo to qualify as a true sale under ASC 860, the securities would have to be fully isolated from the seller’s creditors, the buyer would need unrestricted rights to re-pledge, and the seller could not maintain effective control. Standard repos fail all three, which is why secured-borrowing treatment is the norm.
The IRS treats repos the same way: as secured loans, not sales. The seller is considered to have pledged the securities rather than sold them, and the repurchase premium is characterized as interest rather than capital gain.17Internal Revenue Service. Chief Counsel Advice 202548004 For the cash lender, the premium received is ordinary interest income. That distinction matters because interest income and capital gains face different tax rates and reporting requirements.
The Master Repurchase Agreement
Virtually all U.S. repo transactions are governed by a Master Repurchase Agreement (MRA), a standardized contract published by the Securities Industry and Financial Markets Association. For cross-border transactions, the equivalent is the Global Master Repurchase Agreement published by ICMA.18SIFMA. MRA and GMRA Documentation
The MRA sets the legal framework for all future trades between two counterparties, so it only needs to be negotiated once. It covers how margin calls are handled, what constitutes a default, how collateral is valued, and the close-out netting procedure. Once signed, each individual trade is initiated through a short confirmation that references the master document.
A typical confirmation identifies the purchased securities by CUSIP number, the purchase date, the purchase price, the repurchase date (or a note that the trade is terminable on demand), and the pricing rate.19U.S. Securities and Exchange Commission. Master Repurchase Agreement The confirmation identifies both legal entities and is executed by authorized officers at each institution. This two-tier structure keeps daily trading efficient while preserving a solid legal foundation underneath every transaction.
Why the 2008 Crisis Still Shapes the Market
The 2007–2009 financial crisis showed how quickly the repo market can transmit stress across the financial system. Federal Reserve Bank of New York research found repo activity backed by Treasuries fell roughly 20% ($472 billion) in the second half of 2008, and repos backed by other asset classes fell 15% ($328 billion).20Federal Reserve Bank of New York. Repo over the Financial Crisis Haircuts on lower-quality collateral jumped, which cut off funding for institutions that relied on repo markets for daily liquidity. Mortgage-backed security repos were hit hardest because the collateral’s underlying credit risk had been chronically underpriced.
The crisis accelerated reforms that remain in place today. The Standing Repo Facility now serves as a backstop, tri-party clearing banks have reduced intraday credit extensions, and SOFR was developed as a transparent benchmark drawn from actual repo transactions rather than self-reported estimates.