Federal Funds Rate

The federal funds rate is the key U.S. policy rate banks charge each other overnight, set by the Fed.

Why investors care

It is the lever the Fed pulls to steer inflation and growth.

Where people go wrong

It only directly sets one rate; the whole curve follows from expectations.

In the real market

Inflation runs hot, and the Fed hikes the federal funds rate from 2% to 5% over a year. A family with a variable-rate mortgage sees their payment jump by 40%, a company refinancing its debt pays far more in interest, and investors mark down stocks as safer bonds now pay real yields. The single rate the banks charge each other overnight has become the price of everything. The scenario is why the whole world watches this number: one percentage point here is a mortgage, a layoff, or a rally somewhere else.

Using it in practice

Follow the rate as a barometer of policy, not a timing signal. The direction of the cycle — hiking, holding, or cutting — matters more than the level for long-term allocation decisions.

Example in numbers

Key takeaway

The federal funds rate is the Fed’s main lever — the overnight rate banks charge each other, which ripples into mortgages, bonds, and stock valuations. Hikes cool inflation by making borrowing costlier; cuts stimulate growth by making money cheaper, and markets move on expectations as much as announcements. Follow the direction of the cycle rather than the level, and understand the lag: the rate today shapes the economy and markets months from now. One number, the whole financial system feels it.

Definitions reviewed by the Investing Glossary editorial team.