The most misunderstood tax form there is

The W-4 is the most misunderstood tax form there is in my opinion.  As I type this, I am in the heat of tax season and time and time again I see so many people tremendously overwitheld in taxes or underwithheld in taxes.    The IRS evens offer a free W-4 calculator.  You can find it at http://www.irs.gov/individuals/page/0,,id=14806,00.html