Complete this form so that your employer can withhold the correct California state income tax from your pay. Personal Information.Notice of Withholding. This video will show how to complete DE 4 - employee's withholding allowance certificate online using fillable forms at EDD website. This form is used to change your Federal and California State income tax withholding amounts. Need to withhold more money from your paycheck for taxes, decrease the number of allowances you claim, or have additional money taken out. This form is used to determine your Federal and California (CA) State income tax withholding amount. Learn how to complete the DE 4 form, California's Employee's Withholding Allowance Certificate, to withhold state income tax accurately. California DE 4 form- Employee's withholding allowance certificate- how to fill it up.