To elect an Arizona withholding percentage, an employee must complete Arizona Form A-4, and submit it to their employer. Withholding returns must be filed electronically for taxable years beginning from and after December 31, 2019.Sign into your HCM account, select the "Payroll" tile, then open the "Tax Withholding" tile. Select the Tax Withholding Form you want to download and update. To complete these forms you will need the date the current "Income Withholding Order" was signed. The central repository of all brochures, forms and other information from all over our great site. W4 Federal Tax Form Employee's Withholding Certificate.