California Code, Insurance Code - INS § 12693.42

Any purchasing credit issued by the board, or a contractor acting on behalf of the board, pursuant to this part shall have an overall cost to the program no greater than the cost to the program to enroll the subscriber in the lowest cost plan available to the subscriber through the purchasing pool.  Administrative costs and the cost to the program of any supplemental product shall be included in the calculation of the cost of the purchasing credit program and deducted from the amount of the purchasing credit.