According to preliminary data released by the Internal Revenue Service (IRS) in a letter to Congress on July 17, 2015, about 40 percent of households that received subsidies in 2014 are currently at risk of losing their subsidy eligibility because of complications with their 2014 tax returns. To date 1.8 million heads of households have not submitted the appropriate Affordable Care Act (ACA) related tax forms to reconcile the $5.5 billion in subsidies paid on behalf of these households.