Soon after passage of the new tax reform law, the IRS announced that it is developing salary and wage tax withholding guidance to be issued sometime in January, 2018. The IRS said that use of the new 2018 withholding guidelines will allow taxpayers to begin seeing the changes in their paychecks as early as February 2018. Until then, employers and payroll service providers should continue to use the existing 2017 withholding tables and systems. The new withholding guidance will be designed to work with existing W-4 forms that workers have already filed. No further action by employees is necessary at this time.