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There is no fixed dollar amount that makes the Federal Reserve’s balance sheet “just right.” The Fed aims instead to keep bank reserves in an ample range—large enough that ordinary changes in reserve supply have only a modest effect on short-term interest rates. In December 2025, the Federal Open Market Committee (FOMC) ended balance-sheet runoff and, after judging reserves ample, directed the New York Fed’s trading desk to make reserve-management purchases as needed to maintain that supply.
What does “ample reserves” mean?
Reserves are funds commercial banks hold in accounts at the Federal Reserve. They are a Fed liability and a bank asset. Under the Fed’s ample-reserves framework, policymakers do not try to fine-tune reserve quantities every day. Instead, they use administered interest rates to help keep short-term market rates within the FOMC’s target range.
“Ample” is a range, not a published numerical target. Its boundaries are uncertain because banks’ demand for reserves and the factors affecting reserve supply change over time. As Roberto Perli, head of the New York Fed’s Markets Group, explained in February 2026: “The word ample does not refer to a specific quantity of reserves; rather, it refers to that range of reserves that makes the federal funds rate only modestly sensitive to short-term variations in reserve supply.”
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How does the Fed keep short-term rates under control?
The framework relies primarily on administered rates rather than frequent, active adjustments to the quantity of reserves. Three tools help support rate control:
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- Interest on reserve balances (IORB): The Fed pays this rate to eligible banks on the balances they hold at the central bank. It influences the rates at which banks are willing to lend funds.
- Overnight reverse repurchase agreement facility: This gives eligible counterparties, including money-market funds, an alternative place to invest overnight cash and helps support a floor under short-term rates.
- Standing repo operations: These can ease upward pressure on rates by allowing eligible counterparties to obtain cash against securities when market rates rise above the facility’s rate.
Together, the tools help the Fed maintain control as liquidity shifts. The operating goal is not to eliminate all movement in market rates; it is to keep the federal funds rate within the FOMC’s target range without having to constantly manage reserve quantities.
Why does the balance sheet affect reserves?
The Fed’s balance sheet includes assets and liabilities. Its assets are dominated by securities held in the System Open Market Account, including Treasury and agency securities. Reserves are one liability, but they are not the only one: currency, the Treasury General Account (the U.S. Treasury’s account at the Fed), and deposits held by other institutions also matter.
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Because the balance sheet must balance, changes in those other liabilities can alter the amount of reserves even if the Fed’s securities holdings do not change. For example, shifts in the Treasury’s account or in the public’s demand for currency can affect how much liquidity remains in bank reserve accounts.
Reserve demand also moves. Banks hold reserves to meet payment needs, manage liquidity, and satisfy regulatory requirements. Demand can change with economic growth, shifts in banking and payments, regulation, or financial stress. The Fed therefore has to consider both the supply of reserves and the factors that influence banks’ demand for them.
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Why did the Fed stop shrinking its balance sheet?
The Fed began reducing its balance sheet in June 2022, after pandemic-era asset purchases had left reserves abundant. In October 2025, the FOMC decided that runoff of aggregate securities holdings would conclude effective December 1, 2025. In December, the Committee judged reserve balances to have declined to ample levels and instructed the New York Fed’s trading desk to make purchases of shorter-term Treasury securities as needed to maintain an ample supply.
This was a shift from reducing securities holdings to maintaining reserves—not a declaration that the Fed had settled on a permanent, ideal balance-sheet size. Reserve-management purchases serve the operating framework; they do not establish that the long-run balance sheet should remain at a particular total.
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How large has the balance sheet been?
The following figures describe different dates and measures. They show the scale of past changes, not a current October 2026 total.
| Figure | What it measures | Source and date |
|---|---|---|
| About $800 billion, or roughly 6% of GDP | Fed balance-sheet size in December 2005 | Board of Governors of the Federal Reserve System, January 2026 FEDS Note |
| About $6.5 trillion, or about 21% of GDP | Fed balance-sheet size in December 2025 | Board of Governors of the Federal Reserve System, January 2026 FEDS Note |
| $2.2 trillion reduction, from 35% to just under 22% of GDP | Change in the balance sheet from June 2022 through October 2025 | Federal Reserve Chair Jerome Powell, speech on October 14, 2025 |
| About $2.9 trillion in reserves; $2.4 trillion in currency; $950 billion in the Treasury General Account | Approximate amounts in a stylized balance sheet, not a live release | Federal Reserve Bank of New York, speech on February 12, 2026 |
These figures are not interchangeable: the first three describe the scale of the Fed’s balance sheet at specified dates, while the last gives approximate examples of selected liabilities. For a current balance-sheet or reserve figure, consult the latest weekly H.4.1 statistical release and note its release date. Table 5 presents the consolidated balance sheet; Table 1 reports factors affecting reserve balances.
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Why is the right size still debated?
A January 2026 Federal Reserve research note describes a balance-sheet trilemma: policymakers cannot simultaneously guarantee a small balance sheet, low short-term rate volatility, and little need for market intervention. A larger supply of reserves can help banks absorb liquidity shocks and support rate stability, but a larger central-bank footprint may crowd out private intermediation. A smaller balance sheet can reduce that footprint, but if reserve demand stays high it could bring more rate volatility or require more frequent operations.
Governor Michael S. Barr argued in a May 2026 speech that the balance-sheet total alone is a poor measure of the Fed’s market footprint. He warned that some proposals to shrink it could weaken rate control, bank resilience, or market functioning, and pointed to the 2019 repo-market episode as an example of volatility that can arise when liquidity buffers are insufficient. Those are Barr’s policy views, not an established consensus position of the FOMC.
Any proposal to change the balance sheet is best judged across several questions, not by its total alone:
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- Would the resulting reserve supply remain adequate relative to banks’ demand?
- Could administered rates continue to guide short-term rates without frequent market operations?
- How might the change affect banks’ liquidity management and financial stability?
- Would it materially change the Fed’s market footprint, including the composition of its assets?
The January 2026 FEDS Note says the appropriate steady-state size remains an open question; the available official explanations likewise describe an ongoing assessment of reserve conditions rather than a settled dollar target.
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