(

a) There is in the State Treasury a Replacement Benefit Custodial Fund, that shall be administered exclusively by the board, that is separate and apart from the retirement fund or any other retirement trust fund and that is, notwithstanding

Section 13340, continuously appropriated, without regard to fiscal years, to the board to carry out the purposes of this part. (

b) The earnings on the assets of the Replacement Benefit Custodial Fund are continuously appropriated to the board for expenditure solely to pay the costs of administering this part. (

c) The Replacement Benefit Custodial Fund shall also consist of employer contributions, in amounts equivalent to the benefits that are not paid from either the retirement fund or the retirement trust fund of a participating agency to annuitants because of the application of the payment limitations under

Section of Title of the United States Code; and administrative costs assessed to and paid by members enrolled in the replacement benefit plan. (

d) The board shall determine the amount of employer contributions required for deposit into the Replacement Benefit Custodial Fund, based on all of the following:

(1) The amount of benefits that will not be payable from the retirement fund, or the retirement trust fund of a participating agency, because of the payment limitations in

Section 415.

(2) The amount by which an employer’s contributions to the retirement fund, or the retirement fund of a participating agency shall be reduced, for annuitants whose benefit payments are limited by

Section 415. (

e) The board shall establish within the Replacement Benefit Custodial Fund an individual account for each annuitant whose benefit payments are limited by

Section 415. Employer contributions shall be credited to each account as of the date accrued and payable to the account of each annuitant as of the date on which the contribution is made. Replacement benefits shall be debited from each account as of the date paid to each annuitant. (

f) If all sections of this part, except

Section and this section, become inoperative, pursuant to

Section 21763, and all acts required and authorized by

Section have been fully performed, any remaining balance in a member’s individual account in the Replacement Benefit Custodial Fund shall revert to, and become part of, the trust fund of the retirement system from which the member retired.