In June 2022, the US Federal Reserve kick-started a programme to reduce the size of its balance sheet (QT2). However, banking regulations could hinder its ambitions. The first quantitative tightening (QT1) programme, which was launched by the Fed in October 2017, had already been curtailed early due to the liquidity requirements imposed on banks. Balance sheet constraints could in turn bring QT2 to an early end. The tightened leverage standard is already reducing the ability of banks to act as intermediaries in the secondary markets for US Treasury securities while federal government financing needs continue to grow.