The Federal Reserve’s repo market is the short-term secured lending market the central bank uses to keep overnight interest rates inside the target range set by the Federal Open Market Committee. It works by lending cash to, or borrowing cash from, a defined set of counterparties against high-quality collateral such as U.S. Treasuries and agency securities. The market itself is enormous, averaging roughly $12.6 trillion in daily exposures across all participants, which makes it one of the largest funding markets in the world.1Office of Financial Research. Sizing the U.S. Repo Market
What a Repo Actually Is
A repurchase agreement is a short-term secured loan structured as two trades. A borrower sells securities today and agrees to buy the same securities back at a slightly higher price on a set date. The price difference is the interest, called the repo rate.2FEDERAL RESERVE BANK of NEW YORK. Repo and Reverse Repo Agreements The securities sit with the lender as collateral, so if the borrower fails to return with cash, the lender has something to sell.
Lenders also apply a haircut. If you post $100 million in Treasuries at a 2% haircut, you receive $98 million in cash. That gap absorbs any drop in collateral value before the repurchase date. Treasury haircuts tend to be small because Treasuries are considered about as safe as collateral gets; riskier collateral carries a bigger one.
Most repos run overnight, with the borrower buying the securities back the next business day. Term repos extend for a week, two weeks, a month, or as long as three months, and the Fed has used two-week and three-month term operations during stress periods to give dealers more predictable funding.
Repo vs. Reverse Repo: The Fed’s Two Directions
Naming follows the Fed’s own side of the trade. When the Fed does a repo, it buys securities from a dealer and puts cash into the banking system. When it does a reverse repo, it sells securities and pulls cash back out.
In a standard repo, the New York Fed’s Open Market Trading Desk buys Treasury, agency debt, or agency mortgage-backed securities from a primary dealer and agrees to sell them back later.3Federal Reserve Board. Standing Repurchase Agreement Operations Economically, it’s a collateralized loan from the Fed. Reserves rise, and overnight borrowing costs fall.
In a reverse repo, the Desk sells securities and agrees to buy them back later. Cash flows out of the banking system and into the Fed, reserves shrink, and overnight rates rise.2FEDERAL RESERVE BANK of NEW YORK. Repo and Reverse Repo Agreements The Overnight Reverse Repo Program (ON RRP) is the most visible version, open daily to a broad set of eligible counterparties.
Who Actually Trades With the Fed
For standard repo operations, the Desk deals with primary dealers, the large securities firms that maintain a direct trading relationship with the New York Fed and are expected to participate consistently across market conditions.4Federal Reserve Bank of New York. Primary Dealers They bid in Treasury auctions and make markets for the Fed’s official account holders as well.
For reverse repos, the counterparty list is much broader. Money market mutual funds, government-sponsored enterprises, and certain banks can participate if they meet eligibility requirements. Money market funds, for example, must hold at least $2 billion in net assets or average at least $500 million in outstanding reverse repos over six consecutive months.5FEDERAL RESERVE BANK of NEW YORK. Reverse Repo Counterparties – List and Eligibility Requirements The broader network exists because enormous pools of overnight cash sit outside the traditional banking system, and the Fed’s floor rate only works if it reaches those pools.
How the Fed Uses Repo to Control Short-Term Rates
The Fed doesn’t just announce a target rate and hope. It builds a corridor of administered rates that boxes the federal funds rate into the FOMC’s target range, which sits at 3.50% to 3.75% as of early 2026.6Federal Reserve Board. The Fed Explained – Accessible Version Three tools form the walls.
The ON RRP rate sets a floor. Currently at 3.50%, it’s what the Fed pays counterparties for parking cash overnight in reverse repos. No money fund will lend to a private counterparty for less than what it can earn risk-free at the Fed.7Federal Reserve Bank of St. Louis. Overnight Reverse Repurchase Agreements – Offering Rate
The interest on reserve balances rate, currently 3.65%, acts as a magnet in the middle. Banks won’t lend reserves to each other for less than what the Fed pays them to leave those reserves alone, so most interbank lending clusters near this rate.8Federal Reserve Board. Interest on Reserve Balances
The standing repo operations set a ceiling. Primary dealers and eligible banks can borrow cash from the Fed at 3.75%, the top of the range, whenever market rates threaten to break above it.9Federal Reserve Bank of New York. FAQs – Standing Repurchase Agreement Operations If overnight repo rates start climbing past that level, dealers simply borrow from the Fed instead, which caps the market.
The system is largely self-enforcing. The ON RRP holds the floor, the IORB pulls trading toward the middle, and standing repo operations block a blowout at the top. The Desk can run unscheduled operations when something unusual is happening, but most days the corridor does the work on its own.2FEDERAL RESERVE BANK of NEW YORK. Repo and Reverse Repo Agreements
What September 2019 Showed
The market’s importance became impossible to ignore in mid-September 2019, when overnight repo rates jumped from around 2% to above 5% within hours. The Secured Overnight Financing Rate rose from 2.43% on September 16 to over 5% on September 17, and the effective federal funds rate breached the top of the FOMC’s target range.10Federal Reserve Board. What Happened in Money Markets in September 2019
Two things collided. Corporate tax payments due September 16 drained cash from bank and money fund accounts into the Treasury’s account at the Fed. At the same time, $54 billion in long-term Treasury debt settled, swelling primary dealer inventories that had to be financed through repo. Demand for cash surged as the supply of it shrank.10Federal Reserve Board. What Happened in Money Markets in September 2019
The Desk responded the next morning with an emergency overnight repo offering up to $75 billion, injecting $53 billion in reserves and bringing rates back down. Daily operations continued through the rest of the week, all fully subscribed. By October, the Fed announced roughly $60 billion per month in Treasury bill purchases and extended repo operations into 2020.10Federal Reserve Board. What Happened in Money Markets in September 2019
The episode revealed that bank reserves had shrunk to the point where routine cash demands could destabilize overnight markets. It led directly to the creation of the standing repo facility in 2021, which gives dealers permanent access to Fed funding rather than forcing the Fed to improvise during each crisis.3Federal Reserve Board. Standing Repurchase Agreement Operations
Why the Repo Market Matters Outside the Fed: SOFR
Anyone with an adjustable-rate mortgage, a floating-rate business loan, or exposure to interest rate derivatives is indirectly tied to this market through SOFR. The Secured Overnight Financing Rate measures the cost of borrowing cash overnight against Treasury collateral and is calculated as a volume-weighted median of actual repo transactions in the tri-party market, the general collateral market, and bilateral Treasury repos cleared through the Fixed Income Clearing Corporation.11FEDERAL RESERVE BANK of NEW YORK. Secured Overnight Financing Rate Data The New York Fed publishes it each business day at roughly 8:00 a.m. ET.
SOFR replaced LIBOR, which was built on estimates submitted by banks rather than actual trades and proved vulnerable to manipulation. The remaining U.S. dollar LIBOR settings ceased publication after June 30, 2023.12Federal Housing Finance Agency. LIBOR Transition SOFR draws on daily transaction volumes that regularly exceed $1 trillion, making it representative of real funding costs and very difficult to manipulate.13Alternative Reference Rates Committee. Transition from LIBOR
The Foreign Central Bank Line
Fed repo activity extends past domestic dealers. The Foreign and International Monetary Authorities (FIMA) Repo Facility lets foreign central banks and monetary authorities raise dollars temporarily by selling Treasury holdings to the Fed and agreeing to buy them back, either overnight or over seven days, with overnight pricing tied to the standing repo rate.14Federal Reserve. FIMA Repo Facility FAQs The facility exists so that a foreign central bank under dollar-funding pressure has an orderly alternative to dumping Treasuries on the open market, which would disrupt U.S. bond prices at the worst possible time.
Why the Market Grew So Large: Bankruptcy Safe Harbor
Repos carry a legal advantage that ordinary loans don’t. If a counterparty goes bankrupt, the non-defaulting party can liquidate the collateral immediately, without waiting on a court. Federal law prevents any court or administrative agency from staying or limiting the right to terminate, liquidate, or accelerate a repurchase agreement in a bankruptcy proceeding.15Office of the Law Revision Counsel. 11 USC 559 – Contractual Right to Liquidate, Terminate, or Accelerate a Repurchase Agreement
That safe harbor is one reason the market can operate at razor-thin margins on trillions of dollars a day. Lenders know they can seize collateral immediately if something goes wrong. The same protection has a downside during a crisis, when every lender rushing to sell collateral at once amplifies stress rather than containing it.
Reading ON RRP Balances
ON RRP usage tells you how much excess cash the private market can’t absorb at rates above the Fed’s floor. At the peak in late 2022 and early 2023, counterparties parked over $2 trillion at the Fed daily through overnight reverse repos. By March 2025, that had fallen to $349 billion, as the Fed’s balance sheet shrinkage drained reserves and heavier Treasury bill issuance gave money funds better alternatives.16Office of Financial Research. OFR MMF Monitor Shows Reduced Federal Reserve ON RRP Use
A falling ON RRP balance is one way to gauge how close the system is running to low reserves. When the facility empties out, the cushion of excess liquidity is gone, and funding stress like September 2019 becomes more likely. The standing repo operations are built for exactly that scenario, but the passage from abundant reserves to merely adequate ones is something the Fed watches closely.