The IRS estimates that lenders will send some 6.4 million 1099-C tax forms to Americans in 2012, and these documents are sent to those who had debt forgiven or canceled at some point in the past, according to a report from USA Today. In some cases the charged off debt being taxed can be as much as a few decades old, but the increased total for this year - up from 3.9 million in 2010 - is likely due to debt charged off during the recession, as federal regulations encourage lenders to submit 1099-Cs for debts that haven't been pursued in 36 months.