Complete and attach the following forms: Employee's Withholding Allowance. Please complete each section of the entire form along with your signature.On this page below is a list of LOCAL forms that can be completed online and then printed. The form you need may be in this list. Step 1: Using Adobe Reader, please fill out the following required fields and save the form. Membership and Salary Deduction Authorization form. Employees shall retain seniority from employment with Santa Clara County, based upon application of the definition of Section 10.1. Complete and attach the following forms: Employee's Withholding Allowance CertificateFederal Form W4,. Tax withholding is required and benefits are provided. Reason backfilling to filled code (e.g.