Glossary term
Interest on Reserve Balances (IORB)
Interest on reserve balances is the rate the Federal Reserve pays eligible institutions on balances held in their accounts at the Fed.
Updated
Read time
What Is Interest on Reserve Balances?
Interest on reserve balances, or IORB, is the interest rate the Federal Reserve pays eligible institutions on balances held in their accounts at the Fed. It is an administered rate, meaning the Federal Reserve sets it directly rather than letting it trade in the market.
IORB is one of the Fed’s main tools for steering short-term interest rates. By changing the rate paid on reserve balances, the Fed influences the minimum return many banks are willing to accept for lending funds elsewhere in overnight money markets.
Key Takeaways
- IORB is the rate paid on eligible reserve balances held at the Federal Reserve.
- The Federal Reserve Board sets the IORB rate as an administered policy tool.
- IORB helps keep the federal funds rate within the FOMC’s target range.
- The rate affects short-term money markets, bank incentives, and the transmission of monetary policy.
How IORB Works
Banks and other eligible institutions hold reserve balances at the Fed. If those balances earn IORB, an institution has less reason to lend reserves in the federal funds market at a rate meaningfully below what it can earn from the Fed. That helps place a floor under short-term rates.
For example, if a bank can earn the IORB rate without taking counterparty risk, it will usually demand a competitive rate before lending reserves to another institution. This makes IORB a key part of how the Fed keeps overnight market rates aligned with its policy target.
Tool | How It Supports Rate Control |
|---|---|
Federal funds target range | The FOMC’s desired range for the federal funds rate. |
IORB | Rate paid on reserve balances to influence banks’ willingness to lend reserves. |
Overnight reverse repo rate | Supports rate control for a broader set of money-market participants. |
Open market operations | Transactions that help manage reserves and implement policy. |
How It Reaches Households and Markets
Consumers do not earn IORB directly. The effect is indirect, through the broader rate system. When the Fed raises or lowers administered rates such as IORB, short-term money-market rates tend to move with them. Those moves can influence Treasury bill yields, bank funding costs, savings yields, business credit, and eventually consumer borrowing rates.
IORB is not the only rate that matters, and it does not control every loan or deposit rate one-for-one. Longer-term rates also reflect inflation expectations, economic growth, credit risk, and investor demand. Still, IORB is part of the plumbing that helps Fed policy move from an FOMC decision into actual market rates.
Older IOER References
Some older articles and data references use the term interest on excess reserves, or IOER. That language reflected an earlier operating framework that distinguished between required reserves and excess reserves. Current Fed usage focuses on interest on reserve balances, so IORB is the cleaner term for the present policy tool.
The Bottom Line
Interest on reserve balances is a core tool for implementing monetary policy. It gives eligible institutions a Fed-administered return on reserve balances, which helps guide overnight rates and supports the transmission of Fed policy through money markets.