Arizona Income Withholding Data Form is a document used by employers to report wage and tax withholding information to the Arizona Department of Revenue. It includes information such as employer identification number, employee name and address, wages paid, and taxes withheld. There are two types of Arizona Income Withholding Data Forms: Form A-4 for withholding Arizona State Income Tax, and Form A-1 for withholding Arizona City and County Tax. Both forms are used to report wages and taxes for Arizona employees. The information reported on the forms is used to calculate the employee's state and local income tax liability.