Interest on Reserve Balances: How the Fed Implements Its Rate Target
Interest on reserve balances is the rate the Federal Reserve pays eligible institutions on balances held at Reserve Banks. By adjusting it alongside other administered rates, the Fed influences overnight market rates and keeps the effective federal funds rate within the FOMC’s target range.
Timeline
- 2008: Congress authorized the Federal Reserve to pay interest on reserve balances.
- 2021-07-29: Separate required-reserve and excess-reserve rates were replaced by the single IORB rate.
- Each policy implementation: The Board can adjust IORB while the FOMC sets the federal funds target range and related operating instructions.
Interest on reserve balances, abbreviated IORB, is the interest rate the Federal Reserve pays on balances maintained by or for eligible institutions in master accounts at Federal Reserve Banks. These reserve balances are assets of the banks that hold them and liabilities of the Federal Reserve. They are used for payments, liquidity management and regulatory needs; they are not consumer savings accounts. [1][2]
The Federal Open Market Committee sets a target range for the federal funds rate, the overnight rate on unsecured borrowing of reserve balances between eligible institutions. The Board of Governors sets IORB to help implement that decision. The two are related but different: one is a policy target for a market rate, while the other is an administered rate paid by the central bank. [1][2][3]
IORB influences market behavior because an eligible bank compares private overnight lending opportunities with the return available by leaving balances at the Fed. A bank will generally resist lending to a private counterparty at a materially lower rate without some offsetting reason. Raising IORB therefore puts upward pressure on short-term rates, while lowering it tends to apply downward pressure. [1]
The relationship is not a mechanical legal floor for every transaction. Some important money-market participants cannot earn IORB directly, and market frictions and balance-sheet costs can create spreads. The Fed therefore also uses its overnight reverse repurchase facility, which reaches a broader set of approved counterparties, plus standing repo operations and open-market operations to support rate control and liquidity. [2][3]
The modern framework operates with ample reserves, meaning reserve supply is high enough that small day-to-day quantity changes do not have to steer the funds rate. Administered rates do much of the implementation work. This differs from the older scarce-reserves system, in which the Fed frequently fine-tuned reserve supply and unexpected demand swings could produce more volatility. [2]
Paying IORB does not mean the Fed gives banks free principal. Reserve balances arise on the Fed’s balance sheet and are backed by assets such as Treasury and agency securities. The Fed’s FAQ argues that banks would otherwise hold comparable short-term interest-bearing assets and says the operating framework should be assessed with both the assets and liabilities in view. [2]
For households, IORB matters indirectly. Changes in administered overnight rates influence money-market yields and broader financing conditions, which can eventually affect bank deposits, loans, employment and inflation. It is not the rate paid on an individual checking account or charged on a mortgage. Current values should always be taken from the latest Federal Reserve implementation note because the rate changes with policy. [1][3]
Sources
- Federal Reserve — Why does the Federal Reserve pay banks interest?
- Federal Reserve — Interest on reserve balances FAQs
- Federal Reserve — Economy at a Glance: Policy Rate