What Is the Federal Funds Rate?
The federal funds rate is the interest rate banks charge each other for overnight loans of reserves held at the Federal Reserve. The Fed does not set the rate directly; instead, the Federal Open Market Committee announces a target range, such as 4.25% to 4.50%, and uses its tools to keep the actual market rate inside it.
Because it is the shortest-term, lowest-risk rate in the system, the fed funds rate acts as the anchor for the entire interest rate structure. Banks price their prime rate at a spread above it, and money market yields track it almost one for one.
How It Works
The Fed steers the rate mainly by setting the interest it pays banks on reserve balances, since no bank will lend overnight for much less than it can earn risk-free at the Fed. Changes are made in increments of basis points: a typical move is 25 basis points (0.25%), while aggressive moves of 50 or 75 basis points signal urgency.
When the FOMC raises the target, borrowing costs ripple outward within days: credit card rates, auto loans, and floating-rate corporate debt reset higher. Cuts work in reverse, easing financial conditions to support growth.
Example
Suppose the target range is 4.25% to 4.50% and the FOMC cuts by 25 basis points to 4.00% to 4.25%. A company with $500 million of floating-rate debt priced at a spread over a fed-funds-linked benchmark would see its annual interest expense fall by roughly $1.25 million, and markets would immediately reprice expectations for future cuts.
Why It Matters
Fed funds futures markets trade billions of dollars daily on where this single rate is headed, because it drives short-term yields, the dollar, and equity valuations. The expected path of the rate often matters more to markets than the current level.
For deal-makers, the fed funds rate sets the base cost of leverage: when it sits near zero, cheap debt fuels buyouts and refinancing waves, and when it climbs, financing costs rise and transaction volumes typically fall.
