Prior experience of using IRB approaches

1. An institution applying to use the IRB Approach shall have been using for the IRB exposure classes in question rating systems that were broadly in line with the requirements set out in Section 6 for internal risk measurement and management purposes for at least three years prior to its qualification to use the IRB Approach.

2. An institution applying for the use of own estimates of LGDs and conversion factors shall demonstrate to the satisfaction of the competent authorities that it has been estimating and employing own estimates of LGDs and conversion factors in a manner that was broadly consistent with the requirements for use of own estimates of those parameters set out in Section 6 for at least three years prior to qualification to use own estimates of LGDs and conversion factors.

3. Where the institution extends the use of the IRB Approach subsequent to its initial permission, the experience of the institution shall be sufficient to satisfy the requirements of paragraphs 1 and 2 in respect of the additional exposures covered. If the use of rating systems is extended to exposures that are significantly different to the scope of the existing coverage, such that the existing experience cannot be reasonably assumed to be sufficient to meet the requirements of these provisions in respect of the additional exposures, then the requirements of paragraphs 1 and 2 shall apply separately for the additional exposures.

Article 146

Measures to be taken where the requirements of this Chapter cease to be met

Where an institution ceases to comply with the requirements laid down in this Chapter, it shall notify the competent authority and do one of the following:

(a) present to the satisfaction of the competent authority a plan for a timely return to compliance and realise this plan within a period agreed with the competent authority;

(b) demonstrate to the satisfaction of the competent authorities that the effect of non-compliance is immaterial.

Article 147

Methodology to assign exposure to exposures classes

1. The methodology used by the institution for assigning exposures to different exposure classes shall be appropriate and consistent over time.

2. Each exposure shall be assigned to one of the following exposure classes:

(a) exposures to central governments and central banks;

(b) exposures to on institutions;

(d) retail exposures;

(e) equity exposures;

(f) items representing securitisation positions;

(g) other non credit-obligation assets.

3. The following exposures shall be assigned to the class laid down in point (a) of paragraph 2:

(a) exposures to regional governments, local authorities or public sector entities which are treated as exposures to central governments under Articles 115 and 116;

(b) exposures to multilateral development banks referred to in Article 117(2);

4. The following exposures shall be assigned to the class laid down in point (b) of paragraph 2:

(a) exposures to regional governments and local authorities which are not treated as exposures to central governments in accordance with Article 115(2) and (4);

(b) exposures to Public Sector Entities which are not treated as exposures to central governments in accordance with Article 116(4);