Under RCW 48.12.460, the commissioner shall allow a reduction from liability for reinsurance ceded by a domestic insurer to an assuming insurer not meeting the requirements of RCW 48.12.405 through 48.12.455, in an amount not exceeding the liabilities carried by the ceding insurer. The reduction shall be in the amount of funds held by or on behalf of the ceding insurer, including funds held in trust for the exclusive benefit of the ceding insurer, under a reinsurance contract with the assuming insurer as security for the payment of obligations under the reinsurance contract. The security must be held in the United States subject to withdrawal solely by, and under the exclusive control of, the ceding insurer, or in the case of a trust, held in a qualified United States financial institution as defined in RCW 48.12.465(2). This security may be in the form of any of the following:

(1)(a) Cash;

(b) Securities listed by the Securities Valuation Office of the NAIC, including those exempt from filing as defined by the purposes and procedures manual of the Securities Valuation Office, and qualifying as admitted assets;

(c) Clean, irrevocable, unconditional, and "evergreen" letters of credit issued or confirmed by a qualified United States institution, as defined in RCW 48.12.465(1), effective no later than December 31 of the year for which filing is being made, and in the possession of, or in trust, the ceding insurer on or before the filing date of its annual statement. Letters of credit meeting applicable standards of issuer acceptability as of the dates of their issuance (or confirmation) shall, notwithstanding the issuing (or confirming) institution's subsequent failure to meet applicable standards of issuer acceptability, continue to be acceptable as security until their expiration, extension, renewal, modification, or amendment, whichever first occurs; or

(d) Any other form of security acceptable to the commissioner.

(2) An admitted asset or a reduction from liability for reinsurance ceded to an unauthorized assuming insurer under this section is allowed only when the requirements of WAC 284-13-580 and the applicable portions of WAC 284-13-550, 284-13-560, or 284-13-570 have been satisfied.