(a)

paragraph 1 is amended as follows: the introductory wording is replaced by the following: ‘In quantifying the risk parameters to be associated with rating grades or pools, institutions shall apply the following requirements specific to PD estimation to exposures to central governments and central banks, exposures to regional governments, local authorities and public sector entities, exposures to institutions and exposures to corporates:’ ; point (e) is replaced by the following: ; to the extent that an institution uses data on internal default experience for the estimation of PDs, the estimates shall be reflective of current underwriting standards and of any differences in the rating system that generated the data and the current rating system; where underwriting standards or rating systems have changed, after including an appropriate adjustment, the institution shall add a greater margin of conservatism in its estimate of PD related to the expected range of estimation errors that is not already covered by the appropriate adjustment;’ point (h) is replaced by the following: ; irrespective of whether an institution is using external, internal, or pooled data sources, or a combination of the three, for its PD estimation, the length of the underlying historical observation period used shall be at least five years for at least one source;’ the following point is added: ; irrespective of the method used to estimate PD, institutions shall estimate a PD for each rating grade based on the observed historical average one-year default rate that is an arithmetic average based on the number of obligors (count weighted); other approaches, including exposure-weighted averages, shall not be permitted.’ the following subparagraph is added: ‘For the purposes of the first subparagraph, point (h), of this paragraph where the available observation period spans a longer period for any source, and where those data are relevant, that longer period shall be used. The data shall include a representative mix of good and bad years of the economic cycle relevant for the type of exposures. Subject to the permission of competent authorities, institutions which have not received the permission of the competent authority pursuant to Article 143 to use own estimates of LGD or to use IRB-CCF, may use, when they implement the IRB Approach, relevant data covering a period of two years. The period to be covered shall be increased by one year each year until relevant data cover at least five years.’ ;

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Source: EUR-Lex CELLAR · retrieved 2026-09-04 · Text as adopted (Official Journal); later amendments are not incorporated in this text.