This document sets forth final regulations that provide guidance for employers concerning income tax withholding from employees' wages. These final regulations concern the amount of Federal income tax employers withhold from employees' wages, implement changes in the Internal Revenue Code made by the Tax Cuts and Jobs Act, and reflect the redesigned withholding allowance certificate (Form W-4) and related IRS publications. These final regulations affect employers that pay wages subject to Federal income tax withholding and employees who receive wages subject to Federal income tax withholding.