The tax cut takes effect starting in the 2022 tax year, for which people pay in April 2022. Their withholding amount might change slightly, but thatu2019s only a prediction of what the final tax bill will be in 15 months.What we pay this April will be based on 2022 income and deductions, and falls under the previous tax code. I doubt anyone will u201cnoticeu201d a change in their taxes for at least a year, because any immediate change (in the amount withheld) will be tiny at best.[Edit]: I just saw today on CNN that the W-4 forms used for estimating your annual tax have not been updated. As a result, even if your take-home pay increases, that might mean you will be responsible for a larger tax bill at the end of the year, and possibly even penalties. Why you'll want to double check your paycheck in February