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Competent authorities shall determine the period over which an institution and any parent undertaking and its subsidiaries shall be required to implement the IRB Approach for all exposures within a certain exposure class across different types of exposures within the same business unit and across different business units in the same group, or for the use of own estimates of LGD or for the use of IRB-CCF. That period shall be one that competent authorities consider to be appropriate on the basis of the nature and scale of the activities of the institution concerned, or of any parent undertaking and its subsidiaries, and the number and nature of rating systems to be implemented.

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Source: EUR-Lex CELLAR · retrieved 2026-09-04