The Federal Funds Rate is the interest rate at which commercial banks lend reserve balances to each other overnight in the United States. The Federal Reserve’s policy committee sets the target range it trades in, and it serves as the foundation for all other interest rates in the U.S. economy and influences global capital flows, currency valuations, and investment decisions worldwide.
How It Works
The Federal Reserve, in the United States, does not directly set a single fixed rate. Instead, the Federal Open Market Committee (FOMC) establishes a target range, and the actual rate fluctuates within that band based on supply and demand for overnight reserves among banks. Banks with surplus reserves lend to banks that want more, and the interest rate on those overnight loans is the Federal Funds Rate. Reserve requirements are no longer part of this: the Fed cut them to zero in March 2020 and has not restored them.
Since 2019 the Fed has steered the rate with administered rates rather than by making reserves scarce. The system runs on ample reserves, and two rates fence the market in: interest on reserve balances, which banks earn on money left at the Fed, and the overnight reverse repo rate, which sets a floor for lenders that cannot hold reserves. A bank has little reason to lend below what the Fed itself pays, so the effective rate settles inside the target range. Open market operations still manage the size of the balance sheet, but they are no longer the lever that moves the rate day to day.
The rate typically changes in response to economic conditions, inflation trends, and the FOMC’s assessment of financial stability. Decisions are announced publicly and often accompanied by forward guidance—communication about future policy intentions—to shape market expectations and give investors and businesses time to adjust their plans.
Where It Shows Up in Markets
The Federal Funds Rate is the bedrock of the U.S. yield curve. Banks immediately pass rate changes to consumers and businesses through adjustable-rate mortgages, credit card rates, savings account yields, and short-term lending rates. A shift in the Federal Funds Rate ripples outward within hours, affecting borrowing costs for households and corporations across the economy.
Currency traders watch the Federal Funds Rate closely because interest rate differentials drive exchange rates. When the United States raises rates relative to other countries, foreign investors seek higher-yielding dollar assets, increasing demand for the currency. Conversely, rate cuts can weaken the dollar as capital flows elsewhere. This dynamic makes the FOMC’s decisions critical for forex and international bond markets.
Stock and commodity markets also respond sharply to Federal Funds Rate changes. Higher rates increase the cost of capital for companies and reduce the present value of future earnings, often pressuring equity valuations. Lower rates tend to support asset prices by making borrowing cheaper and alternative investments less attractive. These cross-asset effects make the rate a key variable for all macro traders.
A Concrete Example
Imagine a U.S. bank has $100,000 in excess reserves at the end of a trading day, while another bank faces a shortfall. The bank with excess reserves is willing to lend overnight at a rate determined by market conditions and the FOMC’s target range. If the target is set at a certain level, both banks negotiate within that corridor, and the actual rate they agree on contributes to the day’s Federal Funds Rate average.
Now suppose the FOMC signals concern about inflation and raises its target range. Banks react by offering and accepting higher overnight lending rates. Within a week, mortgage lenders raise rates on new home loans, credit card companies increase rates on existing balances, and companies face higher borrowing costs for investment projects. A multinational firm with U.S. operations pays more to refinance debt; a Japanese investor selling dollar bonds sees their returns shrink relative to yen assets.
Over months, this tighter monetary stance slows spending, moderates inflation, and attracts foreign capital seeking higher U.S. yields. The Federal Funds Rate, though invisible to most citizens, becomes the transmission mechanism through which the central bank reshapes economic behavior and global investment flows.
For the current rate and data: Federal Reserve
Related terms: Policy Rate · Central Bank
Source: Federal Reserve
