Free File Home - Your Link to Free Federal Online Filing
http://www.irs.gov/efile/article/0%2C%2Cid%3D118986%2C00.html
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Easy-to-Use Tax Withholding Calculator
Kiplinger's Easy-to-use tax withholding calculator. Why let the IRS hold your money interest-free? Use our calculator to see how much you can add to your paycheck...starting next pay day.