This graphic shows the calculation of interest by number of days in each quarter times the interest rate for that quarter, by the number of days in the quarter, to get the quarterly interest amount. In this example the BBA IU and penalty amount totaled $44,400.00. The quarterly interest is calculated for the period of 03/16/2019 through 3/15/2022. The quarterly amounts will sum to $5,593.38 total interest.