FILE - This March 22, 2013 file photo shows the exterior of the Internal Revenue Service building in Washington. Here's a little secret for all you procrastinators on Tax Day: The Internal Revenue Service doesn't like to talk about it, but as long as you don't owe any additional taxes, there is no penalty for filing a few days late. The late filing penalty is usually 5 percent of the unpaid taxes for each month _ or part of a month _ a return is late. That can add up quickly if you owe additional taxes. But what if the unpaid taxes are zero? Five percent of zero is ... Zero!  (AP Photo/Susan Walsh, File)
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