The Federal Reserves quantitative tightening (QT) program ran afoul of bank reserve requirements and short funding markets.
The process of draining liquidity from the financial system in the form of maturing bonds and mortgage backed securities had the most significant impact on the markets since the mid-2000s. However, it inevitably collided with the realities of short funding markets and bank reserve requirements.
This article walks through the mechanics at work and how the Fed finally found an "ample" reserve solution in 2025.
The Mechanics of QT, Reserves and Non-Bank Liquidity
As the Federal Reserve engaged in quantitative easing to stimulate the economy during the pandemic, it acquired an enormous balance sheet in the process. Meanwhile, the extra liquidity pumped into the system took the form of reserves at commercial banks.
The process of QT is simply the opposite: as the Fed lets bonds roll off its balance sheet, it extinguishes the reserves that were used to buy them.
While draining this liquidity from the system, the central bank has to accommodate the need for funding in the private sector that buys these maturing bonds from the Fed. There are two main constraints that QT creates.
Bank Reserve Constraints: the need for banks to hold reserves to satisfy Liquidity Coverage Ratio requirements or simply conduct day-to-day operations. Non-Bank Liquidity Constraints: the need for repo financing by primary dealers and levered investors to fund the increase in their Treasury securities inventories.
Money Market Friction: SOFR vs IOR
The friction created by QT is felt in the short funding markets. As the total amount of liquidity in the system decreases, the amount of Treasury securities in the private sector increases.
This creates an increased need for financing for repo dealers buying these securities, while the overall supply of available cash is also decreasing (as it is being drained by the QT operation). This causes an increase in the Secured Overnight Financing Rate (SOFR).
In a QE liquidity environment, SOFR is expected to be slightly below the level of the Fed Interest on Reserves (IOR) as there appears to be an ample supply of reserves at any given point.
However, as the QT progresses and the reserves are drained, SOFR is expected to increase towards the IOR and, in some cases, overshoot it.
These phenomena were observed in the markets in late 2025 as the Fed's balance sheet reduction collided with the need for increased private sector Treasury securities holdings. As the "excess liquidity buffer" provided by the pandemic-era QE was depleted, the banks' reserves dwindled down to the point where the "ample liquidity" was no longer ample.
As the Fed's QT operations continued and the balance sheet reached a level of nearly $9 trillion down toward $6.7 trillion, the reduction in reserves put the repo market borrowing costs near or just a few basis points below the IOR.
The experience of the QT-induced stress in the repo market back in September 2019 is what caused the Fed to slow the pace of QT withdrawals starting in 2022. After watching the markets react to QT, the Federal Open Market Committee (FOMC) decided to stop QT runoff operations altogether in October 2025, with the changes taking effect at the start of December 2025. At the December 2025 statement, the Fed announced that the reserves were at "ample" level.
The New Reserve Management Solution
In order to continue to drain the liquidity from the system after the active QT period (which still continued through 2025), the Fed purchased short-dated Treasury bills (RMPs) in order to offset the growth of non-reserve liabilities (currency in circulation and the Treasury General Account). While the active "withdrawal of liquidity" was complete, the Fed still continued to buy bills and bonds from banks to continue reducing the amount of reserves on the balance sheet.
However, this time around, the purchases were only meant to offset the organic growth of non-reserve liabilities and did not represent a monetization of the public or private debt as QE would have done. As a result, the Fed was able to keep the cost of financing in check (without the spike in SOFR seen in 2019) while maintaining the "ample liquidity" for the banking system.
Looking Ahead
The end of the road for the Fed's QT operations highlights the importance of the structural non-bank dealer constraints and the need for the central bank to maintain a certain level of reserves to satisfy the demands for cash in the repo market.
While the active phase of QT has come to an end, the balancing act between the Treasury, non-bank investors and the ample reserves will occupy the Fed throughout 2026.
Works Cited
"Repo Markets and the Fed's Balance Sheet: Implications for Monetary Policy Implementation," Federal Reserve Note (August 2026).
"The Fed's Balance Sheet and Ample Reserves," St. Louis Fed (February 2026).
"Fed Ends Quantitative Tightening: Impact on U.S. Bank Liquidity," Mirai Risk Tech (November 2025).
"The Federal Reserve ends QT: Key market liquidity insights," SVB Market Insights (November 2025).