The New IRS withholding calculator will not be available until February, the old W4's will continue to be used despite no longer reflecting the new tax law and 2018 employer withholding may result in under withholding resulting in higher taxes owed at year end and possible tax penalties, particularly if there is more than one income in the family, you work at more than one job during the year, and/or you have multiple jobs at the same time.
You will need to proactively monitor and review your withholding, including using the new
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