A group of such organizations or entities may elect, with the approval of the director, to act as a group in fulfilling the requirements of this chapter.
At the end of such taxable year, the director shall compute the benefit costs attributable to the employer as provided in subsection (2) of this section. The director will then debit the employer's account with these costs. When payments exceed benefit costs, either the employer will be credited on subsequent benefit costs with the overpayment or, at the director's discretion, the overpayment will be refunded to the employer. When payments are not sufficient to pay benefit costs, either the employer will be billed the additional amount necessary to pay such costs or, at the director's discretion, the employer's advance payment rate for the next taxable year will be set at a rate that will cover such costs.
Idaho Code § 72-1349A