The Federal Internal Revenue Service (IRS) has developed a new Form W-4 (Employee's Withholding Certificate) for use in 2020 and after. According to the IRS, the form was redesigned to reduce the complexity of and increase transparency in the withholding system. All employees' current Form W-4 (completed prior to 2020) is still valid for payroll purposes; however, all employees have the option to complete a new Form W-4 at any time. Information regarding the new Form W-4 can be found at the IRS website which includes a frequently asked questions page, withholding calculator, and blank Form W-4.
Frequently Asked Questions..here.
Tax Withholding Estimator...here.