The Internal Revenue Service (IRS) recently released new estimates for tax years 2011, 2012, and 2013, revealing a relatively steady tax gap of about 84 percent since 2008 between the true federal tax liability and the amount of tax that was paid on time. For the period 2011 through 2013, this translated to approximately $441 billion per year.
The Internal Revenue Service (IRS) recently released a new study, Tax Gap Estimates for Tax Years 2008-2010. According to this period report, "there has been no significant change in the amount of the tax gap or the rate of compliance since the last report was issued." Including enforcement activities and late payments, the average annual net tax gap for the 2008-2010 period was $406 billion, with an estimated rate of compliance of 83.7 percent. For more information and links to older estimate reports, click here: https://www.irs.gov/uac/The-Tax-Gap