Definition of KIRB

Effective from Dec 28 2022 - Dec 27 2022
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22.2	K_IRB is the ratio of the following measures, expressed in decimal form (e.g. a capital charge equal to 15% of the pool would be expressed as 0.15):
	(1)	The IRB capital requirement (including the expected loss portion and, where applicable, dilution risk as discussed in paragraphs 22.11 to 22.13 below) for the underlying exposures in the pool; to
	(2)	The exposure amount of the pool (e.g. the sum of drawn amounts related to securitized exposures plus the exposure-at-default associated with undrawn commitments related to securitized exposures).¹¹⁰ ¹¹¹
22.3	Notwithstanding the clarification in paragraphs 18.46 and 18.47 for mixed pools, 22.2 (1) must be calculated in accordance with applicable minimum IRB standards in chapters 10 to 16 as if the exposures in the pool were held directly by the bank. This calculation should reflect the effects of any credit risk mitigant that is applied on the underlying exposures (either individually or to the entire pool), and hence benefits all of the securitization exposures.
22.4	For structures involving a special purpose entity (SPE), all of the SPE's exposures related to the securitization are to be treated as exposures in the pool. Exposures related to the securitization that should be treated as exposures in the pool could include assets in which the SPE may have invested a reserve account, such as a cash collateral account or claims against counterparties resulting from interest swaps or currency swaps.¹¹² Notwithstanding, the bank can exclude the SPE's exposures from the pool for capital calculation purposes if the bank can demonstrate to SAMA that the risk of the SPE's exposures is immaterial (for example, because it has been mitigated¹¹³) or that it does not affect the bank's securitization exposure.
22.5	In the case of funded synthetic securitizations, any proceeds of the issuances of credit-linked notes or other funded obligations of the SPE that serve as collateral for the repayment of the securitization exposure in question and for which the bank cannot demonstrate to SAMA that it is immaterial must be included in the calculation of K_IRB if the default risk of the collateral is subject to the tranched loss allocation.¹¹⁴
22.6	To calculate K_IRB, the treatment for eligible purchased receivables described in paragraphs 10.25 to 10.29, 14.2 to 14.7, 16.106, 16.108, 16.112 to 16.120 may be used, with the particularities specified in 22.7 to 22.9, if, according to IRB minimum requirements:
	(1)	For non-retail assets, it would be an undue burden on a bank to assess the default risk of individual obligors; and
	(2)	For retail assets, a bank is unable to primarily rely on internal data.
22.7	22.6 above applies to any securitized exposure, not just purchased receivables. For this purpose, "eligible purchased receivables" should be understood as referring to any securitized exposure for which the conditions of paragraph 22.6 are met, and "eligible purchased corporate receivables" should be understood as referring to any securitized non-retail exposure. All other IRB minimum requirements must be met by the bank.
22.8	SAMA may deny the use of a top-down approach, as defined in 14.8 (1), for eligible purchased receivables for securitized exposures depending on the bank's compliance with minimum requirements.
22.9	The requirements to use a top-down approach for the eligible purchased receivables are generally unchanged when applied to securitizations except in the following cases:
	(1)	The requirement in paragraph 10.30 for the bank to have a claim on all proceeds from the pool of receivables or a pro-rata interest in the proceeds does not apply. Instead, the bank must have a claim on all proceeds from the pool of securitized exposures that have been allocated to the bank's exposure in the securitization in accordance with the terms of the related securitization documentation;
	(2)	In paragraph 16.113, the purchasing bank should be interpreted as the bank calculating K_IRB;
	(3)	In paragraphs 16.115 to 16.120 "a bank" should be read as "the bank estimating probability of default, loss-given-default (LGD) or expected loss for the securitized exposures"; and
	(4)	If the bank calculating K_IRB cannot itself meet the requirements in paragraphs 16.115 to 16.119, it must instead ensure that it meets these requirements through a party to the securitization acting for and in the interest of the investors in the securitization, in accordance with the terms of the related securitization documents. Specifically, requirements for effective control and ownership must be met for all proceeds from the pool of securitized exposures that have been allocated to the bank's exposure to the securitization. Further, in paragraph 16.117 (1), the relevant eligibility criteria and advancing policies are those of the securitization, not those of the bank calculating K_IRB.
22.10	In cases where a bank has set aside a specific provision or has a non- refundable purchase price discount on an exposure in the pool, the quantities defined in paragraphs 22.2 (1) and 22.2 (2) must be calculated using the gross amount of the exposure without the specific provision and/or non- refundable purchase price discount.
22.11	Dilution risk in a securitization must be recognized if it is not immaterial, as demonstrated by the bank to SAMA (see paragraph 14.8), whereby the provisions of paragraphs 22.2 to 22.5 shall apply.
22.12	Where default and dilution risk are treated in an aggregate manner (e.g. an identical reserve or overcollateralization is available to cover losses for both risks), in order to calculate capital requirements for the securitization exposure, a bank must determine KIRB for dilution risk and default risk, respectively, and combine them into a single KIRB prior to applying the SEC-IRBA.
22.13	In certain circumstances, pool level credit enhancement will not be available to cover losses from either credit risk or dilution risk. In the case of separate waterfalls for credit risk and dilution risk, a bank should consult with SAMA as to how the capital calculation should be performed.

¹¹⁰ KIRB must also include the unexpected loss and the expected loss associated with defaulted exposures in the underlying pool.
¹¹¹ Undrawn balances should not be included in the calculation of KIRB in cases where only the drawn balances of revolving facilities have been securitized.
¹¹² In particular, in the case of swaps other than credit derivatives, the numerator of KIRB must include the positive current market value times the risk weight of the swap provider times 8%. In contrast, the denominator should not take into account such a swap, as such a swap would not provide a credit enhancement to any tranche.
¹¹³ Certain best market practices can eliminate or at least significantly reduce the potential risk from a default of a swap provider. Examples of such features could be: cash collateralization of the market value in combination with an agreement of prompt additional payments in case of an increase of the market value of the swap; and minimum credit quality of the swap provider with the obligation to post collateral or present an alternative swap provider without any costs for the SPE in the event of a credit deterioration on the part of the original swap provider. If SAMA are satisfied with these risk mitigants and accept that the contribution of these exposures to the risk of the holder of a securitization exposure is insignificant, SAMA may allow the bank to exclude these exposures from the KIRB calculation.
¹¹⁴ As in the case of swaps other than credit derivatives, the numerator of K IRB (i.e. quantity 22.2(1)) must include the exposure amount of the collateral times its risk weight times 8%, but the denominator should be calculated without recognition of the collateral.