The stock of liquid assets should be available at any time to meet the liquidity outflows. The level of liquidity needs in a short term liquidity stress should be determined in a standardised manner so as to ensure a uniform soundness standard and a level playing field. It should be ensured that such a standardised determination has no unintended consequences for financial markets, credit extension and economic growth, also taking into account different business and investment models and funding environments of institutions across the Union. To this end, the liquidity coverage requirement should be subject to an observation period. Based on the observations and supported by reports from EBA, the Commission should be empowered to adopt a delegated act to introduce in a timely manner a detailed and harmonised liquidity coverage requirement for the Union. In order to ensure global harmonisation in the area of regulation of liquidity any delegated act to introduce the liquidity coverage requirement should be comparable to the liquidity coverage ratio set out in the final international framework for liquidity risk measurement, standards and monitoring of the BCBS taking into account Union and national specificities.