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@fpbear wrote:

I know what you mean.  While I would not forget to undo this in January, I am worried that I don't know how long it takes my company payroll department to process the new W4 and for it to take effect (in both directions, to claim EXEMPT and to undo it).   Therefore I probably will just leave it as-is and take the larger refund next year.


You are not going to claim exempt, because you aren't actually exempt from withholding (and I don't even see a box for it on the current form) but you could add a large dollar amount to line 4b for expected other deductions.  (A credit is worth 2x-4x more than an itemized deduction, I would use 2x to be conservative.) The more you increase line 4b, the lower your withholding will be.  As mentioned, don't forget to change it back in January.