(b) The source of income shall withhold so much of the obligor's income as is necessary to comply with the order authorizing such withholding, up to the maximum amount permitted under applicable law for both current support and for any arrearages which are due. Such withholding, unless otherwise terminated under the provisions of this part, shall apply to any subsequent source of income or any subsequent period of time during which income is received by the obligor.
(c) In addition to any amounts payable as support withheld from the obligor's income, the source of income may deduct a fee, not to exceed one dollar, for administrative costs incurred by the source of income for each withholding.