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The federal funds rate and the prime rate are different interest rates that often move in the same direction. The federal funds rate is an overnight rate in the banking system that the Federal Reserve influences through monetary policy. The prime rate is a benchmark commercial banks use in pricing some loans.
What the federal funds rate is
The federal funds rate is the rate at which depository institutions lend reserve balances to one another overnight. The Federal Open Market Committee sets a target range for that rate and uses monetary-policy tools to keep market rates near the target.
The effective federal funds rate is an observed market rate, while the FOMC target range is the policy objective. Those two concepts should not be treated as the same number.
What the prime rate is
The Federal Reserve’s H.15 release describes the bank prime loan rate as the rate posted by a majority of the top 25 insured U.S.-chartered commercial banks by domestic assets. Prime is one of several base rates banks use to price short-term business loans.
A borrower’s actual rate may be expressed as prime plus or minus a margin, depending on the product, credit profile and lender.
Why the prime rate often changes after Fed decisions
When the Federal Reserve changes its policy stance, short-term funding conditions typically move. Banks may respond by changing posted prime rates, which can then flow through to variable-rate loans tied to prime.
This is one part of the transmission mechanism through which monetary policy influences borrowing conditions for households and businesses.
How to compare the two rates using current data
The Federal Reserve’s H.15 Selected Interest Rates release publishes the effective federal funds rate and the bank prime loan rate. Because both can change, use the latest dated H.15 release rather than copying an old rate into a long-lived comparison.
The difference between the two rates is not a fixed legal rule. Banks can change their posted prime rates, and different credit products can use different pricing formulas.
Which consumer loans may be connected to prime?
Some variable-rate credit products may reference prime or another benchmark. Examples can include certain business lines of credit, home-equity lines or other variable-rate loans.
The contract controls. A consumer should identify the index, margin, adjustment frequency, floors and caps rather than assume every variable loan follows prime in the same way.
Prime rate is not the same as APR
A quoted benchmark or note rate is not necessarily the annual percentage rate. APR can incorporate certain finance charges and may therefore be more useful for comparing consumer-credit offers.
For broader borrowing mechanics, read APY vs. APR and How Interest Rates Work.
Why long-term rates can move differently
Federal Reserve policy has its strongest direct influence on short-term interest rates. Longer-term Treasury, mortgage and corporate-bond yields also reflect expectations about future policy, inflation, growth, risk and market demand.
That is why a Fed decision does not mechanically move every interest rate by the same amount.
How businesses should read a prime-based loan
For a loan priced at “prime plus” a margin, ask:
- which published prime rate is used;
- what margin is added;
- how often the rate resets;
- whether there is a floor or cap;
- what fees apply; and
- how much the payment could change if the benchmark rises.
Continue learning
Read How Federal Reserve Rate Changes Affect Consumers, Yield Curve Explained, and explore the Banking & Interest Rates hub.
Sources & methodology
This article provides general economic and financial education. Interest rates change, and specific loan terms depend on the contract and lender.
EconomicHQ standard
Sources, dates, and methodology matter.
EconomicHQ prioritizes primary sources for consequential financial and economic claims and identifies reporting periods for changing information. This article is educational and does not provide individualized financial, investment, tax, legal, or credit advice.