Instructions for Filing: 1. Additional withholding amounts​​ To ask your employer to withhold an additional amount each pay period, complete lines 3, 4, and 5 on Form IT-2104, as applicable.Withholding will be most accurate if you complete the worksheet and enter the result on the Form W-4 for the highest paying job. Complete Form W-4 so that your employer can withhold the correct federal income tax from your pay. Give Form W-4 to your employer. The Employee Services Division is responsible for the centralized administration and maintenance of all County personnel and benefit-related transactions. Complete this form so that your employer can withhold the correct California state income tax from your paycheck. Enter Personal Information. Income Withholding for Support (FL-195) tells an employer that the court made an order for you or the other person in the case to pay child support.