re: Tax board: official, how much you gettin back thread?

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Push the limit too many times and the IRS forces maximum withholding and you don't have a choice.

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There is no underpayment penalty if you're within 10% of your actually taxes owed OR if you withheld at least 100% of last year's tax liability.

No one is suggesting you should have it down to that much of a science nor should you push the limits, but it isn't much to get your federal withholdings in line so you're not getting $3K refunds of your own money every year.