California Code, Code of Civil Procedure - CCP § 706.024

(a) The amount required to satisfy an earnings withholding order is the total amount required to satisfy the writ of execution on the date the order is issued, with the following additions and subtractions:

(b) From time to time the levying officer, in the levying officer's discretion, may give written notice to the employer of the amount required to satisfy the earnings withholding order and the employer shall determine the total amount to withhold based upon the levying officer's notice, notwithstanding a different amount stated in the order originally served on the employer.

(c) If the full amount required to satisfy the earnings withholding order as stated in the order or in the levying officer's notice under subdivision (b) is withheld from the judgment debtor's earnings, interest ceases to accrue on that amount.