Several U.S. tax changes that were announced too late to be included in Tax Update 18-A are now available on Patches & Updates.
See our Payroll Hot Topics document on My Oracle Support for links to these patches for all releases.
Also, the Louisiana Department of Revenue has adopted updated Income Tax Withholding Tables through an Emergency Rule. This Emergency Rule shall be effective February 16, 2018. We are tracking this on Bug 27556017. Manual instructions for entering the tax changes are available on the Louisiana State Master Document on My Oracle Support.