Subject. We consider the application of negative interest rates by central banks of various countries, as a monetary policy tool. Objectives. We focus on reviewing the historical retrospect, potential risks, as well as positive and negative aspects of using negative interest rate instruments by developed countries. Methods. The study rests on the logical, systems, functional, and situational analysis, methods of grouping, and the monographic survey. Results. The use of negative interest rates as a monetary policy tool by financial regulators in various countries is a least-evil solution, which is aimed at improving the economy after the global economic crisis of 2008–2010. At present, positive and negative factors of the tools' impact on the financial sphere have been identified. In particular, the advantage is a balance between inflation and deflation, as the latter leads to a reduction in aggregate demand, an increase in unemployment, a fall in asset prices, and a slowdown in economic growth. The banking sector bears the risks of negative margin from operations involving fund-raising. The use of negative interest rates is possible, if other measures aimed at boosting economic growth are applied simultaneously. Conclusions. The findings can be used to investigate the negative interest rate instrument and evaluate its effectiveness. They can be helpful for financial market specialists.