Fed Funds Rate: Overnight Interbank Lending Explained
By Ken Chigbo, Founder, KenMacro. Published 2026-05-13.
Quick answer
Fed funds is the overnight unsecured interest rate at which US depository institutions lend reserve balances to each other. The Federal Reserve sets a target range for this rate at FOMC meetings, making it the operational anchor for US monetary policy and the reference point for short-term dollar funding markets globally.
What is fed funds?
Fed funds refers to balances held by depository institutions at the Federal Reserve that banks lend to one another on an overnight, unsecured basis. The effective fed funds rate (EFFR) is the volume-weighted median of these transactions, published daily by the New York Fed. The FOMC sets a target range, currently administered through the interest on reserve balances (IORB) rate at the top and the overnight reverse repo (ON RRP) rate near the bottom. This floor system replaced the pre-2008 corridor framework, allowing the Fed to control short rates without actively draining or adding reserves each day.
How traders use fed funds
The desk treats the fed funds target range as the foundational input for dollar pricing across every horizon. Retail FX traders watch FOMC meeting outcomes, dot plots, and Powell press conferences because shifts in the expected path of fed funds drive the US two-year yield, which in turn dominates DXY and pairs like EUR/USD, USD/JPY, and GBP/USD. Institutional desks price fed funds futures (CME ZQ contracts) and SOFR futures to extract market-implied probabilities for each upcoming meeting. CME’s FedWatch tool aggregates these probabilities. Macro traders cross-check the implied path against incoming CPI, NFP, and PCE data, fading or reinforcing positioning when realised inflation diverges from what the curve has priced.
Common misconceptions about fed funds
Many retail traders assume the Fed directly sets the fed funds rate by decree. It does not. The FOMC announces a target range, then administers it using IORB and ON RRP as floors. Actual overnight transactions print a market-determined rate inside that range. A second misconception is that fed funds and SOFR are interchangeable. SOFR is a secured repo rate based on Treasury collateral, while fed funds is unsecured interbank lending. Volumes in fed funds have shrunk since 2008, with most activity now driven by Federal Home Loan Banks lending to foreign bank branches seeking IORB arbitrage.
Frequently asked
How often does the FOMC change the fed funds rate?
The FOMC meets eight times per year on a pre-scheduled calendar, typically every six to eight weeks. Rate decisions are announced at 2:00pm ET on the second day of each two-day meeting, followed by a Powell press conference at 2:30pm ET. Between meetings the rate normally stays fixed, though the Fed retains the option for inter-meeting moves during crises, as seen in March 2020. Most cycles see changes only at scheduled meetings.
What is the difference between the fed funds rate and the discount rate?
The fed funds rate is the market rate banks charge each other for overnight reserves. The discount rate is what the Fed itself charges banks borrowing directly from the Federal Reserve’s discount window. The discount rate sits above the top of the fed funds target range, so banks borrow from each other first and turn to the discount window only as a backstop. Both are policy tools, but the fed funds target is the headline lever.
How do fed funds futures work?
Fed funds futures (CME ticker ZQ) settle to the monthly average of the effective fed funds rate. Each contract represents a notional 5 million dollars. Traders use them to express views on FOMC decisions, because the price implies an average rate for the contract month. The CME FedWatch tool converts these prices into implied probabilities for hikes, cuts, or holds at each upcoming meeting, making them the benchmark gauge of market policy expectations.
Why does fed funds matter for forex traders?
Interest rate differentials drive currency valuations over the medium term. When the Fed raises fed funds while other central banks hold steady, dollar yields rise relative to peers, attracting capital and lifting DXY. The expected path matters more than the spot rate, so forex pairs react sharply to FOMC statements, dot plots, and economic data that shift the implied trajectory. Carry trades, particularly funded in JPY or CHF against USD, hinge directly on this differential.
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