Overview
Conversations inside the Federal Reserve and among external analysts have intensified over whether altering rules that determine how much cash banks must retain for emergencies could permit the Fed to pare back its $6.7 trillion portfolio of assets. While some participants see scope for noticeable reductions in reserve demand, others at the Fed say the system’s current structure makes a return to the lean pre-crisis balance sheet unlikely.
Estimates of potential reserve relief
At present, banks collectively hold roughly $3.1 trillion in reserves. In a recent analysis, BNP Paribas economists outlined a package of rule changes they say could reduce that demand by about $700 billion from the prevailing trend. Their note described several specific changes that, taken together, would likely take time to implement but could materially lower the amount of cash institutions are expected to hold.
Those proposed adjustments include allowing loans from the Fed’s discount window to count toward regulatory liquidity requirements, establishing central clearing for Federal Reserve repo operations, and upgrading agency and mortgage-backed securities to the highest quality designation from a regulatory perspective. The analysts also highlighted that more active use of the Fed’s repo facility - which supplies cash on demand - might enable banks to carry smaller buffers of emergency funds.
Fed skepticism and internal views
Notwithstanding outside estimates, some influential Fed officials remain skeptical about how much the balance sheet can be reduced given the modern financial system’s configuration. Fed Governor Christopher Waller was explicit on this point, saying, "There's no way you can go back to the small balance sheet we had" in the years before the financial crisis. He acknowledged, however, that the Fed is studying potential rule changes that could trim reserves over time.
Waller offered a narrower numerical view of the possible impact of regulatory tweaks, suggesting reserves might fall by between $300 billion and $500 billion under certain changes. Even if that range were realized, he said, the Fed would still be managing a balance sheet in excess of $6 trillion, adding that "it’s just not likely to go down very much." This perspective positions a significant internal debate about the pace and extent of any balance sheet contraction.
Leadership and historical context
The topic of the Fed’s balance sheet size has taken on new urgency with the arrival of Kevin Warsh as Chair, succeeding the former leader. Warsh is pursuing a reform-oriented agenda and has long criticized the expanded size of the Fed’s holdings, arguing it distorts markets and hampers reliance on the policy interest rate as the primary lever for monetary policy. He served as a Fed governor during the 2007-2009 financial crisis that precipitated the large-scale expansion of Fed bond holdings; his 2011 resignation from the board was widely viewed as connected to his opposition to quantitative easing measures.
Scale of past and recent balance sheet changes
The Fed’s intervention during periods of acute market stress - first during the financial crisis and then during the COVID-19 pandemic - involved large purchases of Treasury and mortgage securities. Those operations drove the central bank’s securities holdings from under $1 trillion in 2007 to a peak of $9 trillion by the summer of 2022, reflecting a substantial change in how the Fed manages short-term interest rates.
From 2022 onward, the Fed reduced its holdings as part of a broader policy tightening, bringing them down to $6.5 trillion by the end of 2025. After that point, the central bank enlarged the holdings again in a technical move intended to bolster liquidity and help maintain firm control over its interest rate target.
Constraints and risks
Under the present operational framework, the Fed faces limits on how far it can withdraw liquidity from the financial system while still keeping a tight grip on its interest rate objective. Officials and outside academics have been outlining options to meet the incoming chair’s balance sheet ambitions, but those plans are unfolding amid concerns that easing liquidity rules at a moment when the Fed is broadly scaling back bank oversight could heighten financial stability risks.
With both internal doubts and outside proposals on the table, the coming months are likely to bring a drawn-out debate over the scale and timing of any reductions in reserves and the balance sheet more broadly. The range of estimates - from several hundred billion dollars to roughly $700 billion in reserve demand reduction - illustrates the degree of uncertainty about what is practically achievable without undercutting the Fed’s ability to steer short-term rates.
Implications for markets and policymakers
The discussion around reserve requirement changes and balance sheet management is important not only for central bank policy architects but also for the banking sector, money markets, and fixed-income investors who track the Fed’s footprint in Treasury and mortgage securities. As policymakers weigh technical rule adjustments against broader stability considerations, the path forward will depend on both regulatory design choices and how the banking system responds to alternative sources of intraday and emergency liquidity.