The regulatory capital requirements for the credit risk of banking book securitizations are determined based on the securitization framework pursuant to Sections 225 to 268 SolvV, which distinguishes between credit risk standardized approach (“CRSA”)-securitization positions and internal ratings based approach (“IRBA”)-securitization positions. The classification of securitization positions as either CRSA- or IRBA-securitization positions depends on the nature of the securitized portfolio. Basically, CRSA-securitization positions are those where the securitized portfolio predominantly includes credit risk exposures, which would qualify as CRSA-exposures under the credit risk framework if they would be held by us directly. Otherwise, if the majority of the securitized portfolio would qualify as IRBA-exposures, the securitization positions qualify as IRBA-securitization positions.
The risk weights of CRSA-securitization positions are derived from their relevant external ratings, when applicable. External ratings must satisfy certain eligibility criteria for being used in the risk weight calculation. Eligible external ratings are taken from Standard & Poor’s, Moody’s, Fitch Ratings and DBRS. If more than one eligible rating is available for a specific securitization position, the relevant external rating is determined as the second best eligible rating in accordance with the provisions set forth in Sections 236 to 237 SolvV. CRSA-securitization positions with no eligible external rating are deducted from liable capital unless they qualify for the application of the risk concentration approach pursuant to Section 243 (2) SolvV which might lead to a risk weight below 1250 %.
The risk weight of IRBA-securitization positions is determined according to the following hierarchy:
- If one or more eligible external ratings exist for the IRBA-securitization position, or if an external rating can be inferred from an eligible external rating of a benchmark securitization position, the risk weight is derived from the relevant external rating (ratings based approach).
- Otherwise, if no eligible external rating exists or can be inferred, the risk weight of the IRBA-securitization position will generally be determined based on the supervisory formula approach pursuant to Section 258 SolvV or the internal assessment approach pursuant to Section 259 SolvV.
- If neither of the aforementioned approaches can be applied, the position is deducted from liable capital.
The ratings based approach applies to the largest part of our IRBA- and CRSA-securitization positions, largely in the lower (better) risk weight bands. We use mainly the external ratings of Standard & Poor’s, Moody’s and Fitch Ratings and DBRS only to a lesser extent. The majority of securitization positions with an eligible external or inferred external credit assessment are retained positions of our synthetic securitizations or securitization positions held as investor. The risk concentration approach is applied to a few CRSA-securitization exposures that are small compared to the total amount of our banking book securitization exposures. The scope of application of the supervisory formula approach and of the internal assessment approach is described below.
There is no securitization position for which we have applied the special provisions for originators of securitization transactions which include an investor’s interest to be recognized by the originator pursuant to Section 245 et seq. respectively Section 262 et seq. SolvV.