$4.5 billion in unpaid tax, penalties and interest due lurks in the Automated Non-Master File.       Home  |  Subscribe       Tax Practice   Jun 01, 2017       Top Stories   Manual processes lead to errors in IRS database by DANIEL HOOD   $4.5 billion in unpaid tax, penalties and interest due lurks in the Automated Non-Master File. READ MORE »       Rich Americans deferring taxes may hasten debate over debt limit   President Trump