The Internal Revenue Service (IRS) issued the new required tax withholding tables, which reflect changes made by the Tax Cuts and Jobs Act, on January 9, 2018. Employers will need to use the new tables beginning on February 15, 2018, to determine how much income tax to withhold from employees’ paychecks. The IRS will issue additional guidance on 2018 income-tax withholding in 2018.