Repo Rate
The Repo Rate (repurchase agreement rate) is the interest rate at which a borrower sells securities to a lender with an agreement to repurchase them at a higher price on a specified future date, effectively making the transaction a short-term collateralized loan where the repo rate is the implied interest cost.
A repurchase agreement (repo) is a two-leg financial transaction. In the first leg, the borrower (often a bank, broker-dealer, or hedge fund) sells a security — typically a US Treasury, agency security, or mortgage-backed security — to the lender (often a money market fund, corporation, or the Federal Reserve) for an agreed cash amount. In the second leg, the borrower repurchases the same security at a slightly higher price on an agreed future date, usually overnight but sometimes for terms of a few days to several weeks. The difference between the selling price and the repurchase price, expressed as an annual percentage, is the repo rate.
Repos are the lifeblood of short-term funding markets. Securities dealers finance their inventory of bonds through the overnight repo market, pledging the bonds they hold as collateral in exchange for cash to fund the purchase. Money market funds and cash-rich institutional investors are the primary cash lenders in the repo market, earning a modest return on idle cash with minimal credit risk because the loan is fully collateralized by high-quality securities. The US repo market turns over trillions of dollars daily, making it one of the most systemically important short-term funding venues in global finance.
The repo rate reflects the interaction of supply (cash available from lenders) and demand (borrowing needs of dealers and leveraged investors) along with the quality of the collateral provided. General collateral (GC) repos use standard, interchangeable Treasury collateral and trade at rates close to the federal funds rate. Special collateral repos involve securities in high demand for delivery (particularly when dealers have shorted a specific bond), causing those specific securities to trade at repo rates below GC rates — sometimes significantly below.
In September 2019, the overnight repo rate spiked dramatically to around 10%, revealing stress in the plumbing of US money markets caused by a combination of quarterly corporate tax payments, large Treasury settlement demands, and reduced bank reserve balances. The Fed responded by conducting repo operations to inject cash. This episode highlighted how critically short-term market function depends on an adequate supply of reserves in the banking system.
In an international context, central banks in countries including India and China use the repo rate (the rate at which the central bank lends to commercial banks against collateral) as a primary policy rate tool analogous to the Federal Reserve's federal funds rate target.