© DaisyBill 2017 Workers’ Compensation Resources Penalty & Interest Medical Services Sample Calculation *((122 Days / 365 Days) X 10%) X $100 = $3.34 Amount Due Per OMFS $100.00 Payment Date 2/1/2017 Date Claims Administrator Received Bill 10/3/2016 Count of Elapsed Days 122 Penalty (15%) $15.00 Interest (10% per annum) $3.34