The IRS has completed updating its online withholding calculator that individual taxpayers can use to determine how many withholding allowances they should claim for 2018. The IRS also issued a new 2018 Form W-4, Employee’s Withholding Allowance Certificate. The IRS had previously announced that taxpayers could use the old 2017 Form W-4, as modified in Notice 2018-14, until 30 days after the new form was issued.
The calculator and new Form W-4 are designed to implement changes made by the Tax Cuts and Jobs Act (passed earlier this year), which increased the standard deduction, removed personal exemptions, increased the child tax credit, limited or discontinued certain deductions, and changed the tax rates and brackets, among many other changes.
To use the calculator, taxpayers should have certain information available, including an estimate of their 2018 income and other items that affect their taxes, including the number of children claimed for the child tax credit and the earned income tax credit. The IRS emphasized that the calculator is used to compute the amount of tax to be withheld in 2018, not for 2017. […]