McGraw-Hill's Taxation of Individuals and Business Entities 3rd Edition by Brian Spilker, Benjamin Ayers, John Robinson, Edmund Outslay, Ronald Worsham, John Barrick, Connie Weaver

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Using the IRS Web site (http://www.rs.ov/index.tml), how large is the current estimated "tax gap" (i.. the amount of tax underpaid by taxpayers annually)? What group of taxpayers represents the largest "contributors" to the tax gap?