Obviously, if withholding payments are mandatory, you don't have a choice. But, I don't see any advantage to setting up voluntary withholdings. Plan to make 4 estimated payments during the year, and subtract the mandatory withholding payments from the estimated payment amounts. You can review your income at the end of the year, and adjust the last estimated payment, which is due on January 15, to avoid or minimize any tax penalty. If in doubt, it is better to make larger estimated payments early in the year to avoid a penalty.
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