Withholding returns must be filed electronically for taxable years beginning from and after December 31, 2019. All wages, salaries, bonuses or other compensation paid for services performed in Arizona are subject to state income tax withholding, with exceptions.All AZ employees are required to complete Form A-4, AZ Withholding Percentage Election. How to fill out the Arizona Quarterly Withholding Tax Return Form? Complete this form to elect an Arizona withholding percentage. Complete this form in the first five days of employment to select an Arizona withholding percent. Schedule section of the instructions. How to fill out the Arizona Quarterly Withholding Tax Return Form? 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.