Quantitative Easing and Tightening: The Balance Sheet Lever
Posted: Sun Oct 04, 2026 8:26 am
Quantitative Easing and Tightening: The Balance Sheet Lever
When interest rates cannot fall further, central banks have another tool: buying assets. Quantitative easing, or QE, involves the central bank purchasing government bonds and sometimes other securities, creating new reserves in the process.
The aim is to lower longer-term interest rates and increase the money supply, to stimulate lending and spending. For currencies, QE tends to weigh on the exchange rate, since it increases supply of the currency and pushes down yields, reducing the return on holding it.
Quantitative tightening, or QT, is the reverse. The central bank lets bonds mature without reinvesting, or sells them, shrinking its balance sheet. This removes liquidity and can raise yields, which tends to support the currency, though effects are often gradual.
Announcements matter more than the actual flows. When a central bank signals a larger or longer program than expected, the currency usually reacts at once. After the 2008 crisis, expectations around the pace of tapering moved markets heavily.
Differences in policy between central banks create opportunities. If one is easing while another tightens, the divergence can drive currency trends for months.
The effects interact with interest rates, inflation, and growth, so isolating QE's impact is hard.
Practical step: find the balance sheet trend of two central banks behind your pair, and note whether they are expanding or shrinking.
When interest rates cannot fall further, central banks have another tool: buying assets. Quantitative easing, or QE, involves the central bank purchasing government bonds and sometimes other securities, creating new reserves in the process.
The aim is to lower longer-term interest rates and increase the money supply, to stimulate lending and spending. For currencies, QE tends to weigh on the exchange rate, since it increases supply of the currency and pushes down yields, reducing the return on holding it.
Quantitative tightening, or QT, is the reverse. The central bank lets bonds mature without reinvesting, or sells them, shrinking its balance sheet. This removes liquidity and can raise yields, which tends to support the currency, though effects are often gradual.
Announcements matter more than the actual flows. When a central bank signals a larger or longer program than expected, the currency usually reacts at once. After the 2008 crisis, expectations around the pace of tapering moved markets heavily.
Differences in policy between central banks create opportunities. If one is easing while another tightens, the divergence can drive currency trends for months.
The effects interact with interest rates, inflation, and growth, so isolating QE's impact is hard.
Practical step: find the balance sheet trend of two central banks behind your pair, and note whether they are expanding or shrinking.