The risk-weighted exposure amounts for credit risk for exposures belonging to one of the exposure classes referred to in points (a) to (e) and (g) of 147(2) shall, unless deducted from own funds, be calculated in accordance with Sub-section 2 except where those exposures are deducted from Common Equity Tier 1 items, Additional Tier 1 items or Tier 2 items.

The risk-weighted exposure amounts for dilution risk for purchased receivables shall be calculated in accordance with Article 157. Where an institution has full recourse to the seller of purchased receivables for default risk and for dilution risk, the provisions of this Article and Article 152 and Article 158(1) to (4) in relation to purchased receivables shall not apply and the exposure shall be treated as a collateralised exposure.

The calculation of risk-weighted exposure amounts for credit risk and dilution risk shall be based on the relevant parameters associated with the exposure in question. These shall include PD, LGD, maturity (hereinafter referred to as ‘M’) and exposure value of the exposure. PD and LGD may be considered separately or jointly, in accordance with Section 4.

Institutions shall calculate risk-weighted exposure amounts for credit risk for all exposures belonging to the exposure class ‘equity’ referred to in point (e) of Article 147(2) in accordance with Article 155. Institutions may use the approaches set out in Article 155(3) and (4) where they have received the prior permission of the competent authorities. Competent authorities shall grant permission for an institution to use the internal models approach set out in Article 155(4) provided that the institution meets the requirements set out in Sub-section 4 of Section 6.

The calculation of risk weighted exposure amounts for credit risk for specialised lending exposures may be calculated in accordance with Article 153(5).

For exposures belonging to the exposure classes referred to in points (a) to (d) of Article 147(2), institutions shall provide their own estimates of PDs in accordance with Article 143 and Section 6.

For exposures belonging to the exposure class referred to in point (d) of Article 147(2), institutions shall provide own estimates of LGDs and conversion factors in accordance with Article 143 and Section 6.

For exposures belonging to the exposure classes referred to in points (a) to (c) of Article 147(2), institutions shall apply the LGD values set out in Article 161(1), and the conversion factors set out in Article 166(8)(a) to (d), unless it has been permitted to use its own estimates of LGDs and conversion factors for those exposure classes in accordance with paragraph 9.

For all exposures belonging to the exposure classes referred to in points (a) to (c) of Article 147(2), the competent authority shall permit institutions to use own estimates of LGDs and conversion factors in accordance with Article 143 and Section 6.

The risk-weighted exposure amounts for securitised exposures and for exposures belonging to the exposure class referred to in point (f) of Article 147(2) shall be calculated in accordance with Chapter 5.