(a) Securitization risk weight approaches. Except as provided elsewhere in this section or in § 1240.41:

(1) An Enterprise must deduct from common equity tier 1 capital any after-tax gain-on-sale resulting from a securitization and apply a 1,250 percent risk weight to the portion of a CEIO that does not constitute after-tax gain-on-sale.

(2) If a securitization exposure does not require deduction under paragraph (a)(1) of this section, an Enterprise may assign a risk weight to the securitization exposure either using the simplified supervisory formula approach (SSFA) in accordance with § 1240.43(a) through (d) for a securitization exposure that is not a retained CRT exposure or an acquired CRT exposure or using the credit risk transfer approach (CRTA) in accordance with § 1240.44 for a retained CRT exposure, and in either case, subject to the limitation under paragraph (e) of this section.

(3) If a securitization exposure does not require deduction under paragraph (a)(1) of this section and the Enterprise cannot, or chooses not to apply the SSFA or the CRTA to the exposure, the Enterprise must assign a risk weight to the exposure as described in § 1240.45.

(4) If a securitization exposure is a derivative contract (other than protection provided by an Enterprise in the form of a credit derivative) that has a first priority claim on the cash flows from the underlying exposures (notwithstanding amounts due under interest rate or currency derivative contracts, fees due, or other similar payments), an Enterprise may choose to set the risk-weighted asset amount of the exposure equal to the amount of the exposure as determined in paragraph (c) of this section.

(b) Total risk-weighted assets for securitization exposures. An Enterprise's total risk-weighted assets for securitization exposures equals the sum of the risk-weighted asset amount for securitization exposures that the Enterprise risk weights under § 1240.41(d), § 1240.42(a)(1), § 1240.43, § 1240.44, or § 1240.45, and paragraphs (e) through (h) of this section, as applicable.

(c) Exposure amount of a CRT or other securitization exposure—(1) On-balance sheet securitization exposures. Except as provided for retained CRT exposures in § 1240.44(f), the exposure amount of an on-balance sheet securitization exposure (excluding a repo-style transaction, eligible margin loan, OTC derivative contract, or cleared transaction) is equal to the carrying value of the exposure.

(2) Off-balance sheet securitization exposures. Except as provided in paragraph (h) of this section or as provided for retained CRT exposures in § 1240.44(f), the exposure amount of an off-balance sheet securitization exposure that is not a repo-style transaction, eligible margin loan, cleared transaction (other than a credit derivative), or an OTC derivative contract (other than a credit derivative) is the notional amount of the exposure.

(3) Repo-style transactions, eligible margin loans, and derivative contracts. The exposure amount of a securitization exposure that is a repo-style transaction, eligible margin loan, or derivative contract (other than a credit derivative) is the exposure amount of the transaction as calculated under § 1240.36 or § 1240.39, as applicable.

(d) Overlapping exposures. If an Enterprise has multiple securitization exposures that provide duplicative coverage to the underlying exposures of a securitization, the Enterprise is not required to hold duplicative risk-based capital against the overlapping position. Instead, the Enterprise may apply to the overlapping position the applicable risk-based capital treatment that results in the highest risk-based capital requirement.

(e) Implicit support. If an Enterprise provides support to a securitization (including a CRT) in excess of the Enterprise's contractual obligation to provide credit support to the securitization (implicit support):

(1) The Enterprise must include in risk-weighted assets all of the underlying exposures associated with the securitization as if the exposures had not been securitized and must deduct from common equity tier 1 capital any after-tax gain-on-sale resulting from the securitization; and

(2) The Enterprise must disclose publicly:

(i) That it has provided implicit support to the securitization; and

(ii) The risk-based capital impact to the Enterprise of providing such implicit support.

(f) Interest-only mortgage-backed securities. For non-credit-enhancing interest-only mortgage-backed securities that are not subject to § 1240.32(c), the risk weight may not be less than 100 percent.

(g) Nth-to-default credit derivatives—(1) Protection provider. An Enterprise may assign a risk weight using the SSFA in § 1240.43 to an nth-to-default credit derivative in accordance with this paragraph (g). An Enterprise must determine its exposure in the nth-to-default credit derivative as the largest notional amount of all the underlying exposures.

(2) Attachment and detachment points. For purposes of determining the risk weight for an nth-to-default credit derivative using the SSFA, the Enterprise must calculate the attachment point and detachment point of its exposure as follows:

(i) The attachment point (parameter A) is the ratio of the sum of the notional amounts of all underlying exposures that are subordinated to the Enterprise's exposure to the total notional amount of all underlying exposures. The ratio is expressed as a decimal value between zero and one. In the case of a first-to-default credit derivative, there are no underlying exposures that are subordinated to the Enterprise's exposure. In the case of a second-or-subsequent-to-default credit derivative, the smallest (n-1) notional amounts of the underlying exposure(s) are subordinated to the Enterprise's exposure.

(ii) The detachment point (parameter D) equals the sum of parameter A plus the ratio of the notional amount of the Enterprise's exposure in the nth-to-default credit derivative to the total notional amount of all underlying exposures. The ratio is expressed as a decimal value between zero and one.

(3) Risk weights. An Enterprise that does not use the SSFA to determine a risk weight for its nth-to-default credit derivative must assign a risk weight of 1,250 percent to the exposure.

(4) Protection purchaser—(i) First-to-default credit derivatives. An Enterprise that obtains credit protection on a group of underlying exposures through a first-to-default credit derivative that meets the rules of recognition of § 1240.38(b) must determine its risk-based capital requirement for the underlying exposures as if the Enterprise synthetically securitized the underlying exposure with the smallest risk-weighted asset amount and had obtained no credit risk mitigant on the other underlying exposures. An Enterprise must calculate a risk-based capital requirement for counterparty credit risk according to § 1240.36 for a first-to-default credit derivative that does not meet the rules of recognition of § 1240.38(b).

(ii) Second-or-subsequent-to-default credit derivatives. (A) An Enterprise that obtains credit protection on a group of underlying exposures through a nth-to-default credit derivative that meets the rules of recognition of § 1240.38(b) (other than a first-to-default credit derivative) may recognize the credit risk mitigation benefits of the derivative only if:

(1) The Enterprise also has obtained credit protection on the same underlying exposures in the form of first-through-(n-1)-to-default credit derivatives; or

(2) If n-1 of the underlying exposures have already defaulted.

(B) If an Enterprise satisfies the requirements of paragraph (i)(4)(ii)(A) of this section, the Enterprise must determine its risk-based capital requirement for the underlying exposures as if the Enterprise had only synthetically securitized the underlying exposure with the nth smallest risk-weighted asset amount and had obtained no credit risk mitigant on the other underlying exposures.

(C) An Enterprise must calculate a risk-based capital requirement for counterparty credit risk according to § 1240.36 for a nth-to-default credit derivative that does not meet the rules of recognition of § 1240.38(b).

(h) Guarantees and credit derivatives other than nth-to-default credit derivatives—(1) Protection provider. For a guarantee or credit derivative (other than an nth-to-default credit derivative) provided by an Enterprise that covers the full amount or a pro rata share of a securitization exposure's principal and interest, the Enterprise must risk weight the guarantee or credit derivative as if it holds the portion of the reference exposure covered by the guarantee or credit derivative.

(2) Protection purchaser. (i) An Enterprise that purchases a guarantee or OTC credit derivative (other than an nth-to-default credit derivative) that is recognized under § 1240.46 as a credit risk mitigant (including via collateral recognized under § 1240.39) is not required to compute a separate counterparty credit risk capital requirement under § 1240.31, in accordance with § 1240.36(c).

(ii) If an Enterprise cannot, or chooses not to, recognize a purchased credit derivative as a credit risk mitigant under § 1240.46, the Enterprise must determine the exposure amount of the credit derivative under § 1240.36.

(A) If the Enterprise purchases credit protection from a counterparty that is not a securitization SPE, the Enterprise must determine the risk weight for the exposure according to this subpart D.

(B) If the Enterprise purchases the credit protection from a counterparty that is a securitization SPE, the Enterprise must determine the risk weight for the exposure according to § 1240.42, including § 1240.42(a)(4) for a credit derivative that has a first priority claim on the cash flows from the underlying exposures of the securitization SPE (notwithstanding amounts due under interest rate or currency derivative contracts, fees due, or other similar payments).

[85 FR 82198, Dec. 17, 2020, as amended at 88 FR 83481, Nov. 30, 2023]