(23)Under current rules, the standard formula interest rate risk assumes that positive interest rates cannot become negative and that negative interest rates cannot decrease further. However, historical developments in financial markets showed that such assumption may significantly underestimate exposures to interest rate risk by insurance or reinsurance undertakings. Therefore, the standard formula should be amended to appropriately reflect the risk of low or negative interest rates. That should be achieved via a recalibration of the interest rate risk sub-module to reflect the existence of a negative yield environment.