Article 1 › 1

‘1. An institution that is permitted to apply the IRB Approach in accordance with Article 107(1) shall, together with any parent undertaking and its subsidiaries, implement the IRB Approach for at least one of the exposure classes referred to in Article 147(2), point (a), point (aa)(i) or (ii), point (b), point (c)(i), (ii) or (iii), point (d)(i), (ii), (iii) or (iv), or point (g). Once an institution has implemented the IRB Approach for a certain type of exposures within an exposure class, it shall do so for all exposures within that exposure class, unless it has received the permission of the competent authority to use the Standardised Approach permanently in accordance with Article 150. Subject to the prior permission of the competent authorities, implementation of the IRB Approach may be carried out sequentially across the different types of exposures within a certain exposure class 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.

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