Every new employee must complete a Form W-4. If a Form W-4 is not completed, the tax withholding will default to.Gov and search for withholding requirements for updates, online tools, and more information, including: Forms and Publications This is an advisory publication providing direction to staff administering the Sales and Use Tax Law and Regulations. Although. Assistance Completing the Form​​ Contact our office at 909-382-3220 for help.