(18)In accordance with Article 508(2) of Regulation (EU) No 575/2013, the Commission must report to the co-legislators by no later than 31 December 2015 on whether and how the liquidity coverage requirement laid down in Part Six should apply to investment firms. Until that provision starts to apply, investment firms should remain subject to the national law of Member States on the liquidity coverage requirement. However, investment firms should be subject to the liquidity coverage ratio laid down in this Regulation on a consolidated basis, where they form part of banking groups.