12 C.F.R. § 324.135
(a) Eligibility and operational criteria for double default treatment. An FDIC-supervised institution may recognize the credit risk mitigation benefits of a guarantee or credit derivative covering an exposure described in § 324.134(a)(1) by applying the double default treatment in this section if all the following criteria are satisfied:
(1) The hedged exposure is fully covered or covered on a pro rata basis by:
(2) The guarantee or credit derivative is:
(4) The obligor of the hedged exposure is not:
(c) Partial coverage. If a transaction meets the criteria in paragraph (a) of this section and the protection amount (P) of the guarantee or credit derivative is less than the EAD of the hedged exposure, the FDIC-supervised institution must treat the hedged exposure as two separate exposures (protected and unprotected) in order to recognize double default treatment on the protected portion of the exposure:
(e) The double default dollar risk-based capital requirement. The dollar risk-based capital requirement for a hedged exposure to which an FDIC-supervised institution has applied double default treatment is KDD multiplied by the EAD of the exposure. KDD is calculated according to the following formula: KDD = Ko × (0.15 + 160 × PDg),
where: (1)
(2) PDg equals PD of the protection provider. (3) PDo equals PD of the obligor of the hedged exposure. (4) LGDg equals: (i) The lower of the LGD of the hedged exposure (not adjusted to reflect the guarantee or credit derivative) and the LGD of the guarantee or credit derivative, if the guarantee or credit derivative provides the FDIC-supervised institution with the option to receive immediate payout on triggering the protection; or (ii) The LGD of the guarantee or credit derivative, if the guarantee or credit derivative does not provide the FDIC-supervised institution with the option to receive immediate payout on triggering the protection; and (5) ρos (asset value correlation of the obligor) is calculated according to the appropriate formula for (R) provided in Table 1 in § 324.131, with PD equal to PDo. (6) b (maturity adjustment coefficient) is calculated according to the formula for b provided in Table 1 in § 324.131, with PD equal to the lesser of PDo and PDg; and (7) M (maturity) is the effective maturity of the guarantee or credit derivative, which may not be less than one year or greater than five years.