of the amount included in the previous table , $ 57 million of unrecognized tax benefits would impact the effective tax rate if recognized . aon does not expect the unrecognized tax positions to change significantly over the next twelve months . the company recognizes interest and penalties related to unrecognized income tax benefits in its provision for income taxes . aon accrued potential penalties and interest of less than $ 1 million related to unrecognized tax positions during 2007