| Assuming you are single and will claim the standard deduction, your federal tax liability will be about $2,850, which means you need only withhold another $780 to cover it.
Since the $780 is UNDER the $1,000 threshold of the under-withholding penalty, you could STOP withholding and settle up with the IRS with a check when you file your 2009 tax return NLT 15 April 2010.
Whether you want to do that or not is up to you. Under your current withholding, you will cover your federal tax liability by mid-November and will get a refund in the $700 range when you file your 2009 return.
While I always encourage taxpayers to write a check when they file their return (because ANY refund is an interest-free loan to the government), a $700 refund is not too excessive and is probably psychologically preferable to writing a $780 check.
The choice is yours! | 
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