The IRS has released the new Form W-4 that new employees must use and employees who wish to update their withholding in 2020.
https://www.irs.gov/pub/irs-pdf/fw4.pdf
For employees in states that have allowed the use of IRS Form W-4 to calculate the state income tax withholding may not allow such use any longer since the new W-4 is radically different, eliminating the use of withholding allowances. Most states have state versions of the W-4 that should be used. Some states have/are updating their forms for 2020, so check with your state’s web site to see if a newer version of the form should be used.
For employees who are hired in December of 2019 for pay dates in Decemeber 2019 should use the previous version of the form found here:
https://www.irs.gov/pub/irs-prior/fw4–2019.pdf
