Changing W4 deductions for severance check

I have an employee who asked for as many deductions as possible be taken on his final paycheck. I told him to fill out a new W-4, he wants to take 20 deductions, do I have any obligations? I know he does not have that many legitimate deductions, he simply wants to pay less taxes since he is going to be laid off.
Thanks!
Thanks!
Comments
Not since 2005 :ball and chain:
[url]http://www.hrresource.com/articles/view.php?article_id=107[/url]
I’d check with an attorney before contacting the IRS to report excessive withholding allowances. **==