The tax-year 2001 gross tax gap — the difference between what taxpayers should have paid and what they actually paid — was an estimated $345 billion.
Source: U.S. Government Accountability Office, Report to Committee on Finance, U.S. Senate, Tax Administration, Costs and Uses of Third-Party Information Returns, November 2007.
IRS Increases Business Mileage Rate to 58.5 Cents on July 1