The Additional Child Tax Credit, a tax credit that was intended to help working families with children living at home, is being used by undocumented workers to the tune of $4.2 billion a year. Not only are they claiming children in the United States, but also children that are still residing in Mexico. Although the IRS has known about this problem for years, nothing has been done. How does this happen? Read more: http://dailycaller.com/2012/04/30/irs-loophole-for-illegals-children-costs-taxpayers-billions/#ixzz1tiR1RbxL.