Quantitative Tightening is the process by which a central bank shrinks its balance sheet, removing liquidity from the financial system. It is the reverse of QE and represents a form of passive monetary tightening.
Two Methods
(1) Passive runoff: The Fed lets maturing bonds roll off without reinvesting the proceeds β the primary method used. (2) Active selling: Directly selling bonds on the open market β rarely used due to market disruption risk.
Current QT Program
The Fed's current QT began in June 2022, initially allowing up to $95 billion/month to roll off ($60B Treasuries + $35B MBS). In June 2024, the pace was slowed to $60B/month ($25B Treasuries + $35B MBS) as the Fed sought to avoid over-tightening reserve levels.
Balance Sheet Trajectory
The Fed's balance sheet peaked at $8.96 trillion in April 2022 and has declined to approximately $6.8 trillion by early 2025. The previous QT (2017-2019) reduced the balance sheet from $4.5T to $3.8T before being halted after the September 2019 repo market crisis.
Why Markets Care
QT drains liquidity from the financial system, functioning as a quiet tightening force alongside rate hikes. Research from the Fed suggests $1 trillion of QT has a roughly equivalent market impact to a 25bp rate hike. The 'QT taper' (slowing the pace) is itself a dovish signal.
Key Risk
The biggest concern is that the Fed misjudges the minimum level of reserves the banking system needs, triggering funding stress β as happened in September 2019 when overnight repo rates spiked to 10%, forcing the Fed to restart emergency lending.