The IRS revised the W-4 and withholding calculator to reflect changes in the tax law (new tax tables, itemized deductions, increases in child tax credit, the new dependent credit and repeal of dependent of exemptions).
Employees are advised to review their current W-4 withholding. The withholding calculator on IRS.gov can be useful for employees who wish to update their withholding in response to this new law, or for changes in their personal circumstances in 2018.
Further information from the IRS is attached.
