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Tax forms sit on a desk at an H&R Block, Inc. office in San Francisco, California, U.S., on Friday, March 14, 2014. The deadline for filing 2013 U.S. taxes is April 15. Photographer: David Paul Morris/Bloomberg via Getty Images

Tax forms sit on a desk at an H&R Block, Inc. office in San Francisco, California, U.S., on Friday, March 14, 2014. The deadline for filing 2013 U.S. taxes is April 15. Photographer: David Paul Morris/Bloomberg via Getty Images