This undated handout photo provided by the Internal Revenue Service (IRS) shows National Taxpayer Advocate Nina Olson. The nation's tax law is so thick and complicated that businesses and individuals spend more than 6 billion hours a year complying with filing requirements. (AP Photo/Christopher Germano, IRS)

Photo by: Christopher Germano

This undated handout photo provided by the Internal Revenue Service (IRS) shows National Taxpayer Advocate Nina Olson. The nation's tax law is so thick and complicated that businesses and individuals spend more than 6 billion hours a year complying with filing requirements. (AP Photo/Christopher Germano, IRS)