1. By way of derogation from Articles 429 and 430, during the period between 1 January 2014 and 31 December 2021, institutions shall calculate and report the leverage ratio by using both of the following as the capital measure:
(a) Tier 1 capital;
(b) Tier 1 capital, subject to the derogations laid down in Chapters 1 and 2 of this Title.
2. By way of derogation from Article 451(1), institutions may choose whether to disclose the information on the leverage ratio based on either just one or both of the definitions of the capital measure specified in points (a) and (b) of paragraph 1 of this Article. Where institutions change their decision on which leverage ratio to disclose, the first disclosure that occurs after such change shall contain a reconciliation of the information on all leverage ratios disclosed up to the moment of the change.
3. By way of derogation from Article 429(2), during the period from 1 January 2014 to 31 December 2017, competent authorities may permit institutions to calculate the end-of-quarter leverage ratio where they consider that institutions may not have data of sufficiently good quality to calculate a leverage ratio that is an arithmetic mean of the monthly leverage ratios over a quarter.