Caterpillar Inc Vice President for Finance Services Julie Lagacy is flanked by former Senior International Tax Manager Rodney Perkins (left) and Chief Tax Officer Robin Beran (right) as they are sworn in to testify on Tuesday. Jonathan Ernst/Reuters/Landov hide caption

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A case against the Swiss bank UBS in 2008 led Congress to create more regulations for foreign banks holding American money. Rather than comply, many banks opted to stop serving American account-holders. Fabrice Coffrini/AFP/Getty Images hide caption

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Former UBS banking executive Raoul Weil was indicted by a U.S. federal grand jury in 2008, on charges that he helped wealthy clients avoid billions in taxes. Antonio Calanni/AP hide caption

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A waiter serves patrons at Tony's Restaurant, part of the Casablanca Hotel in New York's Times Square. The custom at some restaurants of automatic gratuities for larger parties might change because of an IRS rule change. Don Emmert/AFP/Getty Images hide caption

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Senate Finance Committee Chairman Sen. Max Baucus, D-Mont., (center) and House Ways and Means Committee Chairman Rep. Dave Camp, R-Mich., (right) speak about overhauling the tax code at the 3M Innovation Center in Maplewood, Minn., on July 8. Hannah Foslien/AP hide caption

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A chart shows estimated tax revenue losses due to online sales in 11 U.S. cities. Figures for 2013 are projections. IHS Global Insight hide caption

itoggle caption IHS Global Insight

A yard sign opposes a local tax increase to fund public safety in Josephine County, Oregon. The ballot measure reportedly failed by a thin margin. Amelia Templeton/OPB hide caption

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While many people look to tax preparation services for help, Tobie Stanger, editor at Consumer Reports, says online tools are often cost-effective. /iStockphoto.com hide caption

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President Obama, with House Speaker John Boehner (R-Ohio) behind him, delivering his State of the Union address last January. Saul Loeb/Getty Images hide caption

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