Federal Funds Rate: What It Is, How It's Determined, and Why It's Important

The federal funds rate is a cornerstone of U.S. monetary policy and a key driver of economic activity. It refers to the target interest rate range set by the Federal Open Market Committee (FOMC), the policymaking body of the Federal Reserve System. 

FOMC's decisions about the federal funds rate have far-reaching economic consequences, and they're one of the few major market indicators widely followed by the nonfinancial press. For instance, when the Federal Reserve cut its influential fed funds rate by 25 basis points to a range of 4.25% to 4.50% on Dec. 18, 2024, it warranted major news coverage across the U.S.

It marked the first rate cut in over four years and signaled a shift in strategy aimed at bolstering the economy and preventing a rise in unemployment. Such changes in the federal funds rate can impact everything from mortgage and credit card interest rates to business investments and the stock market. Below, we discuss why.

Understanding the Federal Funds Rate

The federal funds rate refers to the interest rate that banks charge other institutions for lending excess cash to them from their reserve balances overnight.

By law, banks must maintain a reserve equal to a certain percentage of their deposits in an account at a Federal Reserve bank. The amount of money a bank must keep in its Fed account is known as a reserve requirement and is based on a percentage of the bank's total deposits.

Financial institutions are required to maintain interest-bearing accounts at Federal Reserve banks to ensure they have enough money to cover depositors' withdrawals and other obligations. Any money in their reserve that exceeds the required level is available for lending to other banks that might have a shortfall.

The end-of-the-day balances in the bank's account averaged over two-week reserve maintenance periods are used to determine whether it meets its reserve requirements. If a bank expects to have end-of-the-day balances greater than what's required, it can lend the excess to an institution that anticipates a shortfall in its balances. The interest rate the lending bank can charge is the federal funds rate, or fed funds rate.

The FOMC makes its decisions about rate adjustments based on key economic indicators that may show signs of inflation, recession, or other issues that can affect sustainable economic growth. The indicators can include measures like the core inflation rate and the durable goods orders report.

How the Federal Funds Rate Is Adjusted

The FOMC meets eight times a year to set the target federal funds rate range as part of its monetary policy. The committee uses various tools to push the effective federal funds rate into that target range. This rate serves as a benchmark for many other interest rates in the economy and is used to help promote economic growth.

The Fed adjusts the federal funds rate in response to economic conditions:

Lowering the rate: When the Fed wants to stimulate economic growth or prevent unemployment from rising, it lowers the target federal funds rate. This makes borrowing cheaper throughout the economy, encouraging spending and investment.

Raising the rate: Conversely, when the Fed wants to cool down an overheating economy or combat inflation, it raises the target rate, making borrowing more expensive and encouraging saving.

Holding steady: In periods of economic stability, the Fed may choose to keep the rate unchanged for extended periods.

These decisions are closely watched by markets and can have significant impacts on various sectors of the economy.

Historical Policy Shifts

The federal funds rate has fluctuated significantly over time, reflecting changing economic conditions and policy approaches. The magnitude of rate changes can vary. While 25 basis point adjustments are standard, the Fed may opt for more significant changes (such as 50 basis points or more) if it believes more dramatic action is needed to influence economic conditions.

For instance, following the 2008 financial crisis, the Fed kept rates near zero for several years to stimulate economic recovery. In contrast, periods of high inflation have seen the Fed raise rates aggressively to cool the economy.

The target for the federal funds rate has varied widely over the years in response to the prevailing economic conditions. It was set as high as 20% in the early 1980s in response to inflation. With the coming of the Great Recession, the rate was slashed to a record-low target of 0% to 0.25% in an attempt to encourage growth.

In March 2020, the target rate was between 0% and 0.25%. In 2022, to combat inflation, the Fed started raising its rate slowly, a process that continued into 2024.

The FOMC increased the target fed funds rate to a range of 5.25% and 5.5% in July 2023. It maintained this range during subsequent meetings and confirmed the range in its June 2024 meeting.

On Sept. 18, 2024, the committee announced that it would cut its target range by half a percentage point to 4.75% to 5%, citing the "progress on inflation and the balance of risks." It said it will continue to reduce its Treasury security holds, agency debt, and mortgage‑backed securities (MBSs).

The committee then again cut rates in November 2024 by a quarter of a percentage point, and again in December 2024 to a range of 4.25% to 4.50%.

Impact of the Fed Funds Rate

The federal funds rate is one of the most important interest rates in the U.S. economy. That's because it impacts monetary and financial conditions, which in turn have a bearing on critical aspects of the broader economy including employment, growth, and inflation.

The rate also influences short-term interest rates, albeit indirectly, for everything from home and auto loans to credit cards, as lenders often set their rates based on the prime lending rate. The prime rate is the rate banks charge their most creditworthy borrowers—a rate that is also influenced by the federal funds rate.

Investors keep a close watch on the federal funds rate. The stock market typically reacts very strongly to changes in the target rate.

For example, a small decline in the rate can prompt the market to leap higher as the borrowing costs for companies get lower. Many stock analysts pay particular attention to statements by members of the FOMC to try to get a sense of where the target rate may be headed.

Sectors Affected by the Federal Funds Rate

The federal funds rate has far-reaching effects across various sectors of the economy:

• Automotive industry: Car loan rates typically follow trends in the federal funds rate, impacting vehicle sales.
• Banking: Banks use this rate as a basis for setting interest rates on loans and savings accounts, thus impacting the rest of the list here.
• Consumer lending: Credit card rates and personal loan rates are influenced by changes in the federal funds rate.
• Corporate investments: Lower rates spur business expansion and capital investments, while higher rates generally curb such activities.
• Foreign exchange: Rate changes can affect the value of the U.S. dollar relative to other currencies, impacting international trade and investment.
• Government finance: The rate influences the cost of government borrowing and can affect budget deficits.
• Real estate: Mortgage rates often move in tandem with the federal funds rate, affecting home buying and refinancing activity. It's a major reason the Fed Funds rate makes national news headlines.
• Financial markets: Changes in the federal funds rate can affect stock prices since it affects corporate profits and investor behavior.

The Bottom Line

The federal funds rate is used by the Fed to control monetary policy and is watched closely by investors to gauge how the market may move in the future. The rate is one of the most important pieces of financial data in the U.S.

It's the interest rate at which depository institutions (mainly banks) lend reserve balances to other depository institutions overnight on an uncollateralized basis. In simpler terms, it's the rate banks charge each other for short-term loans to meet their reserve requirements.