This paper uses the recent cross-country experience with quantitative tightening (QT) to assess the impact of shrinking central bank balance sheets. We analyze the experience in seven advanced economies (Australia, Canada, Euro area, New Zealand, Sweden, UK and US)—documenting different strategies and the substantive reduction in central bank balance sheets that has already occurred. Then we assess the macroeconomic and financial impact of QT announcements on yields and a range of other market prices. […]