Taxpayers who haven’t checked their withholding should use the Withholding Calculator ASAP
The IRS recommends taxpayers use the Withholding Calculator to do a “Paycheck Checkup” as soon as possible. This will help taxpayers check that they are having the correct amount of income tax withheld from their paychecks. Earlier this year the IRS updated the Withholding Calculator tool on IRS.gov to reflect changes in the Tax Cuts and Jobs Act passed