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A woman walks out of the Internal Revenue Service (IRS) headquarters building in Washington, D.C., U.S., on Wednesday, Feb. 17, 2016. Taxpayers have until Monday, April 18 to file their 2015 tax returns and pay any tax owed. Photographer: Andrew Harrer/Bloomberg via Getty Images

A woman walks out of the Internal Revenue Service (IRS) headquarters building in Washington, D.C., U.S., on Wednesday, Feb. 17, 2016. Taxpayers have until Monday, April 18 to file their 2015 tax returns and pay any tax owed. Photographer: Andrew Harrer/Bloomberg via Getty Images